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Member "NEWS" (30 Dec 2018, 167595 Bytes) of package /linux/misc/tzcode2018i.tar.gz:


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    1 News for the tz database
    2 
    3 Release 2018i - 2018-12-30 11:05:43 -0800
    4 
    5   Briefly:
    6     São Tomé and Príncipe switches from +01 to +00 on 2019-01-01.
    7 
    8   Changes to future timestamps
    9 
   10     Due to a change in government, São Tomé and Príncipe switches back
   11     from +01 to +00 on 2019-01-01 at 02:00.  (Thanks to Vadim
   12     Nasardinov and Michael Deckers.)
   13 
   14 
   15 Release 2018h - 2018-12-23 17:59:32 -0800
   16 
   17   Briefly:
   18     Qyzylorda, Kazakhstan moved from +06 to +05 on 2018-12-21.
   19     New zone Asia/Qostanay because Qostanay, Kazakhstan didn't move.
   20     Metlakatla, Alaska observes PST this winter only.
   21     Guess Morocco will continue to adjust clocks around Ramadan.
   22     Add predictions for Iran from 2038 through 2090.
   23 
   24   Changes to future timestamps
   25 
   26     Guess that Morocco will continue to fall back just before and
   27     spring forward just after Ramadan, the practice since 2012.
   28     (Thanks to Maamar Abdelkader.)  This means Morocco will observe
   29     negative DST during Ramadan in main and vanguard formats, and in
   30     rearguard format it stays in the +00 timezone and observes
   31     ordinary DST in all months other than Ramadan.  As before, extend
   32     this guesswork to the year 2037.  As a consequence, Morocco is
   33     scheduled to observe three DST transitions in some Gregorian years
   34     (e.g., 2033) due to the mismatch between the Gregorian and Islamic
   35     calendars.
   36 
   37     The table of exact transitions for Iranian DST has been extended.
   38     It formerly cut off before the year 2038 in a nod to 32-bit time_t.
   39     It now cuts off before 2091 as there is doubt about how the Persian
   40     calendar will treat 2091.  This change predicts DST transitions in
   41     2038-9, 2042-3, and 2046-7 to occur one day later than previously
   42     predicted.  As before, post-cutoff transitions are approximated.
   43 
   44   Changes to past and future timestamps
   45 
   46     Qyzylorda (aka Kyzylorda) oblast in Kazakhstan moved from +06 to
   47     +05 on 2018-12-21.  This is a zone split as Qostanay (aka
   48     Kostanay) did not switch, so create a zone Asia/Qostanay.
   49 
   50     Metlakatla moved from Alaska to Pacific standard time on 2018-11-04.
   51     It did not change clocks that day and remains on -08 this winter.
   52     (Thanks to Ryan Stanley.)  It will revert to the usual Alaska
   53     rules next spring, so this change affects only timestamps
   54     from 2018-11-04 through 2019-03-10.
   55 
   56   Change to past timestamps
   57 
   58     Kwajalein's 1993-08-20 transition from -12 to +12 was at 24:00,
   59     not 00:00.  I transcribed the time incorrectly from Shanks.
   60     (Thanks to Phake Nick.)
   61 
   62     Nauru's 1979 transition was on 02-10 at 02:00, not 05-01 at 00:00.
   63     (Thanks to Phake Nick.)
   64 
   65     Guam observed DST irregularly from 1959 through 1977.
   66     (Thanks to Phake Nick.)
   67 
   68     Hong Kong observed DST in 1941 starting 06-15 (not 04-01), then on
   69     10-01 changed standard time to +08:30 (not +08).  Its transition
   70     back to +08 after WWII was on 1945-09-15, not the previous day.
   71     Its 1904-10-30 change took effect at 01:00 +08 (not 00:00 LMT).
   72     (Thanks to Phake Nick, Steve Allen, and Joseph Myers.)  Also,
   73     its 1952 fallback was on 11-02 (not 10-25).
   74 
   75     This release contains many changes to timestamps before 1946 due
   76     to Japanese possession or occupation of Pacific/Chuuk,
   77     Pacific/Guam, Pacific/Kosrae, Pacific/Kwajalein, Pacific/Majuro,
   78     Pacific/Nauru, Pacific/Palau, and Pacific/Pohnpei.
   79     (Thanks to Phake Nick.)
   80 
   81     Assume that the Spanish East Indies was like the Philippines and
   82     observed American time until the end of 1844.  This affects
   83     Pacific/Chuuk, Pacific/Kosrae, Pacific/Palau, and Pacific/Pohnpei.
   84 
   85   Changes to past tm_isdst flags
   86 
   87     For the recent Morocco change, the tm_isdst flag should be 1 from
   88     2018-10-27 00:00 to 2018-10-28 03:00.  (Thanks to Michael Deckers.)
   89     Give a URL to the official decree.  (Thanks to Matt Johnson.)
   90 
   91 
   92 Release 2018g - 2018-10-26 22:22:45 -0700
   93 
   94   Briefly:
   95     Morocco switches to permanent +01 on 2018-10-28.
   96 
   97   Changes to future timestamps
   98 
   99     Morocco switches from +00/+01 to permanent +01 effective 2018-10-28,
  100     so its clocks will not fall back as previously scheduled.
  101     (Thanks to Mohamed Essedik Najd and Brian Inglis.)
  102 
  103   Changes to code
  104 
  105     When generating TZif files with leap seconds, zic no longer uses a
  106     format that trips up older 32-bit clients, fixing a bug introduced
  107     in 2018f.  (Reported by Daniel Fischer.)  Also, the zic workaround
  108     for QTBUG-53071 now also works for TZif files with leap seconds.
  109 
  110     The translator to rearguard format now rewrites the line
  111     "Rule Japan 1948 1951 - Sep Sat>=8 25:00 0 S" to
  112     "Rule Japan 1948 1951 - Sep Sun>=9  1:00 0 S".
  113     This caters to zic before 2007 and to Oracle TZUpdater 2.2.0
  114     and earlier.  (Reported by Christos Zoulas.)
  115 
  116   Changes to past time zone abbreviations
  117 
  118     Change HDT to HWT/HPT for WWII-era abbreviations in Hawaii.
  119     This reverts to 2011h, as the abbreviation change in 2011i was
  120     likely inadvertent.
  121 
  122   Changes to documentation
  123 
  124     tzfile.5 has new sections on interoperability issues.
  125 
  126 
  127 Release 2018f - 2018-10-18 00:14:18 -0700
  128 
  129   Briefly:
  130   Volgograd moves from +03 to +04 on 2018-10-28.
  131   Fiji ends DST 2019-01-13, not 2019-01-20.
  132   Most of Chile changes DST dates, effective 2019-04-06.
  133 
  134   Changes to future timestamps
  135 
  136     Volgograd moves from +03 to +04 on 2018-10-28 at 02:00.
  137     (Thanks to Alexander Fetisov and Stepan Golosunov.)
  138 
  139     Fiji ends DST 2019-01-13 instead of the 2019-01-20 previously
  140     predicted.  (Thanks to Raymond Kumar.)  Adjust future predictions
  141     accordingly.
  142 
  143     Most of Chile will end DST on the first Saturday in April at 24:00 mainland
  144     time, and resume DST on the first Saturday in September at 24:00 mainland
  145     time.  The changes are effective from 2019-04-06, and do not affect the
  146     Magallanes region modeled by America/Punta_Arenas.  (Thanks to Juan Correa
  147     and Tim Parenti.)  Adjust future predictions accordingly.
  148 
  149   Changes to past timestamps
  150 
  151     The 2018-05-05 North Korea 30-minute time zone change took place
  152     at 23:30 the previous day, not at 00:00 that day.
  153 
  154     China's 1988 spring-forward transition was on April 17, not
  155     April 10.  Its DST transitions in 1986/91 were at 02:00, not 00:00.
  156     (Thanks to P Chan.)
  157 
  158     Fix several issues for Macau before 1992.  Macau's pre-1904 LMT
  159     was off by 10 s.  Macau switched to +08 in 1904 not 1912, and
  160     temporarily switched to +09/+10 during World War II.  Macau
  161     observed DST in 1942/79, not 1961/80, and there were several
  162     errors for transition times and dates.  (Thanks to P Chan.)
  163 
  164     The 1948-1951 fallback transitions in Japan were at 25:00 on
  165     September's second Saturday, not at 24:00.  (Thanks to Phake Nick.)
  166     zic turns this into 01:00 on the day after September's second
  167     Saturday, which is the best that POSIX or C platforms can do.
  168 
  169     Incorporate 1940-1949 Asia/Shanghai DST transitions from a 2014
  170     paper by Li Yu, replacing more-questionable data from Shanks.
  171 
  172   Changes to time zone abbreviations
  173 
  174     Use "PST" and "PDT" for Philippine time.  (Thanks to Paul Goyette.)
  175 
  176   Changes to code
  177 
  178     zic now always generates TZif files where time type 0 is used for
  179     timestamps before the first transition.  This simplifies the
  180     reading of TZif files and should not affect behavior of existing
  181     TZif readers because the same set of time types is used; only
  182     their internal indexes may have changed.  This affects only the
  183     legacy zones EST5EDT, CST6CDT, MST7MDT, PST8PDT, CET, MET, and
  184     EET, which previously used nonzero types for these timestamps.
  185 
  186     Because of the type 0 change, zic no longer outputs a dummy
  187     transition at time -2**59 (before the Big Bang), as clients should
  188     no longer need this to handle historical timestamps correctly.
  189     This reverts a change introduced in 2013d and shrinks most TZif
  190     files by a few bytes.
  191 
  192     zic now supports negative time-of-day in Rule and Leap lines, e.g.,
  193     "Rule X min max - Apr lastSun -6:00 1:00 -" means the transition
  194     occurs at 18:00 on the Saturday before the last Sunday in April.
  195     This behavior was documented in 2018a but the code did not
  196     entirely match the documentation.
  197 
  198     localtime.c no longer requires at least one time type in TZif
  199     files that lack transitions or have a POSIX-style TZ string.  This
  200     future-proofs the code against possible future extensions to the
  201     format that would allow TZif files with POSIX-style TZ strings and
  202     without transitions or time types.
  203 
  204     A read-access subscript error in localtime.c has been fixed.
  205     It could occur only in TZif files with timecnt == 0, something that
  206     does not happen in practice now but could happen in future versions.
  207 
  208     localtime.c no longer ignores TZif POSIX-style TZ strings that
  209     specify only standard time.  Instead, these TZ strings now
  210     override the default time type for timestamps after the last
  211     transition (or for all timestamps if there are no transitions),
  212     just as DST strings specifying DST have always done.
  213 
  214     leapseconds.awk now outputs "#updated" and "#expires" comments,
  215     and supports leap seconds at the ends of months other than June
  216     and December.  (Inspired by suggestions from Chris Woodbury.)
  217 
  218   Changes to documentation
  219 
  220     New restrictions: A Rule name must start with a character that
  221     is neither an ASCII digit nor "-" nor "+", and an unquoted name
  222     should not use characters in the set "!$%&'()*,/:;<=>?@[\]^`{|}~".
  223     The latter restriction makes room for future extensions (a
  224     possibility noted by Tom Lane).
  225 
  226     tzfile.5 now documents what time types apply before the first and
  227     after the last transition, if any.
  228 
  229     Documentation now uses the spelling "timezone" for a TZ setting
  230     that determines timestamp history, and "time zone" for a
  231     geographic region currently sharing the same standard time.
  232 
  233     The name "TZif" is now used for the tz binary data format.
  234 
  235     tz-link.htm now mentions the A0 TimeZone Migration utilities.
  236     (Thanks to Aldrin Martoq for the link.)
  237 
  238   Changes to build procedure
  239 
  240     New 'make' target 'rearguard_tarballs' to build the rearguard
  241     tarball only.  This is a convenience on platforms that lack lzip
  242     if you want to build the rearguard tarball.  (Problem reported by
  243     Deborah Goldsmith.)
  244 
  245     tzdata.zi is now more stable from release to release.  (Problem
  246     noted by Tom Lane.)  It is also a bit shorter.
  247 
  248     tzdata.zi now can contain comment lines documenting configuration
  249     information, such as which data format was selected, which input
  250     files were used, and how leap seconds are treated.  (Problems
  251     noted by Lester Caine and Brian Inglis.)  If the Makefile defaults
  252     are used these comment lines are absent, for backward
  253     compatibility.  A redistributor intending to alter its copy of the
  254     files should also append "-LABEL" to the 'version' file's first
  255     line, where "LABEL" identifies the redistributor's change.
  256 
  257 
  258 Release 2018e - 2018-05-01 23:42:51 -0700
  259 
  260   Briefly:
  261 
  262     North Korea switches back to +09 on 2018-05-05.
  263     The main format uses negative DST again, for Ireland etc.
  264     'make tarballs' now also builds a rearguard tarball.
  265     New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines.
  266 
  267   Changes to past and future timestamps
  268 
  269     North Korea switches back from +0830 to +09 on 2018-05-05.
  270     (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon,
  271     and Tim Parenti.)
  272 
  273     Bring back the negative-DST changes of 2018a, except be more
  274     compatible with data parsers that do not support negative DST.
  275     Also, this now affects historical timestamps in Namibia and the
  276     former Czechoslovakia, not just Ireland.  The main format now uses
  277     negative DST to model timestamps in Europe/Dublin (from 1971 on),
  278     Europe/Prague (1946/7), and Africa/Windhoek (1994/2017).  This
  279     does not affect UT offsets, only time zone abbreviations and the
  280     tm_isdst flag.  Also, this does not affect rearguard or vanguard
  281     formats; effectively the main format now uses vanguard instead of
  282     rearguard format.  Data parsers that do not support negative DST
  283     can still use data from the rearguard tarball described below.
  284 
  285   Changes to build procedure
  286 
  287     The command 'make tarballs' now also builds the tarball
  288     tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz
  289     except that it uses rearguard format intended for trailing-edge
  290     data parsers.
  291 
  292   Changes to data format and to code
  293 
  294     The SAVE column of Rule and Zone lines can now have an 's' or 'd'
  295     suffix, which specifies whether the adjusted time is standard time
  296     or daylight saving time.  If no suffix is given, daylight saving
  297     time is used if and only if the SAVE column is nonzero; this is
  298     the longstanding behavior.  Although this new feature is not used
  299     in tzdata, it could be used to specify the legal time in Namibia
  300     1994-2017, as opposed to the popular time (see below).
  301 
  302   Changes to past timestamps
  303 
  304     From 1994 through 2017 Namibia observed DST in winter, not summer.
  305     That is, it used negative DST, as Ireland still does.  This change
  306     does not affect UTC offsets; it affects only the tm_isdst flag and
  307     the abbreviation used during summer, which is now CAT, not WAST.
  308     Although (as noted by Michael Deckers) summer and winter time were
  309     both simply called "standard time" in Namibian law, in common
  310     practice winter time was considered to be DST (as noted by Stephen
  311     Colebourne).  The full effect of this change is only in vanguard
  312     and main format; in rearguard format, the tm_isdst flag is still
  313     zero in winter and nonzero in summer.
  314 
  315     In 1946/7 Czechoslovakia also observed negative DST in winter.
  316     The full effect of this change is only in vanguard and main
  317     formats; in rearguard format, it is modeled as plain GMT without
  318     daylight saving.  Also, the dates of some 1944/5 DST transitions
  319     in Czechoslovakia have been changed.
  320 
  321 
  322 Release 2018d - 2018-03-22 07:05:46 -0700
  323 
  324   Briefly:
  325 
  326   Palestine starts DST a week earlier in 2018.
  327   Add support for vanguard and rearguard data consumers.
  328   Add subsecond precision to source data format, though not to data.
  329 
  330   Changes to future timestamps
  331 
  332     In 2018, Palestine starts DST on March 24, not March 31.
  333     Adjust future predictions accordingly.  (Thanks to Sharef Mustafa.)
  334 
  335   Changes to past and future timestamps
  336 
  337     Casey Station in Antarctica changed from +11 to +08 on 2018-03-11
  338     at 04:00.  (Thanks to Steffen Thorsen.)
  339 
  340   Changes to past timestamps
  341 
  342     Historical transitions for Uruguay, represented by
  343     America/Montevideo, have been updated per official legal documents,
  344     replacing previous data mainly originating from the inventions of
  345     Shanks & Pottenger.  This has resulted in adjustments ranging from
  346     30 to 90 minutes in either direction over at least two dozen
  347     distinct periods ranging from one day to several years in length.
  348     A mere handful of pre-1991 transitions are unaffected; data since
  349     then has come from more reliable contemporaneous reporting.  These
  350     changes affect various timestamps in 1920-1923, 1936, 1939,
  351     1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990.
  352     Additionally, Uruguay's pre-standard-time UT offset has been
  353     adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to
  354     match the location of the Observatory of the National Meteorological
  355     Institute in Montevideo.
  356     (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.)
  357 
  358     Enderbury and Kiritimati skipped New Year's Eve 1994, not
  359     New Year's Day 1995.  (Thanks to Kerry Shetline.)
  360 
  361     Fix the 1912-01-01 transition for Portugal and its colonies.
  362     This transition was at 00:00 according to the new UT offset, not
  363     according to the old one.  Also assume that Cape Verde switched on
  364     the same date as the rest, not in 1907.  This affects
  365     Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores,
  366     Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon.
  367     (Thanks to Michael Deckers.)
  368 
  369     Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in
  370     Turks & Caicos.
  371 
  372   Changes to past time zone abbreviations
  373 
  374     MMT took effect in Uruguay from 1908-06-10, not 1898-06-28.  There
  375     is no clock change associated with the transition.
  376 
  377   Changes to build procedure
  378 
  379     The new DATAFORM macro in the Makefile lets the installer choose
  380     among three source data formats.  The idea is to lessen downstream
  381     disruption when data formats are improved.
  382 
  383     * DATAFORM=vanguard installs from the latest, bleeding-edge
  384       format.  DATAFORM=main (the default) installs from the format
  385       used in the 'africa' etc. files.  DATAFORM=rearguard installs
  386       from a trailing-edge format.  Eventually, elements of today's
  387       vanguard format should move to the main format, and similarly
  388       the main format's features should eventually move to the
  389       rearguard format.
  390 
  391     * In the current version, the main and rearguard formats are
  392       identical and match that of 2018c, so this change does not
  393       affect default behavior.  The vanguard format currently contains
  394       one feature not in the main format: negative SAVE values.  This
  395       improves support for Ireland, which uses Irish Standard Time
  396       (IST, UTC+01) in summer and GMT (UTC) in winter.  tzcode has
  397       supported negative SAVE values for decades, and this feature
  398       should move to the main format soon.  However, it will not move
  399       to the rearguard format for quite some time because some
  400       downstream parsers do not support it.
  401 
  402     * The build procedure constructs three files vanguard.zi, main.zi,
  403       and rearguard.zi, one for each format.  The files represent the
  404       same data as closely as the formats allow.  These three files
  405       are intended for downstream data consumers and are not
  406       installed.  Zoneinfo parsers that do not support negative SAVE values
  407       should start using rearguard.zi, so that they will be unaffected
  408       when the negative-DST feature moves from vanguard to main.
  409       Bleeding-edge Zoneinfo parsers that support the new features
  410       already can use vanguard.zi; in this respect, current tzcode is
  411       bleeding-edge.
  412 
  413     The Makefile should now be safe for parallelized builds, and 'make
  414     -j to2050new.tzs' is now much faster on a multiprocessor host
  415     with GNU Make.
  416 
  417     When built with -DSUPPRESS_TZDIR, the tzcode library no longer
  418     prepends TZDIR/ to file names that do not begin with '/'.  This is
  419     not recommended for general use, due to its security implications.
  420     (From a suggestion by Manuela Friedrich.)
  421 
  422   Changes to code
  423 
  424     zic now accepts subsecond precision in expressions like
  425     00:19:32.13, which is approximately the legal time of the
  426     Netherlands from 1835 to 1937.  However, because it is
  427     questionable whether the few recorded uses of non-integer offsets
  428     had subsecond precision in practice, there are no plans for tzdata
  429     to use this feature.  (Thanks to Steve Allen for pointing out
  430     the limitations of historical data in this area.)
  431 
  432     The code is a bit more portable to MS-Windows.  Installers can
  433     compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that
  434     reserve identifiers like 'localtime'.  (Thanks to Manuela
  435     Friedrich).
  436 
  437   Changes to documentation and commentary
  438 
  439     theory.html now outlines tzdb's extensions to POSIX's model for
  440     civil time, and has a section "POSIX features no longer needed"
  441     that lists POSIX API components that are now vestigial.
  442     (From suggestions by Steve Summit.)  It also better distinguishes
  443     time zones from tz regions.  (From a suggestion by Guy Harris.)
  444 
  445     Commentary is now more consistent about using the phrase "daylight
  446     saving time", to match the C name tm_isdst.  Daylight saving time
  447     need not occur in summer, and need not have a positive offset from
  448     standard time.
  449 
  450     Commentary about historical transitions in Uruguay has been expanded
  451     with links to many relevant legal documents.
  452     (Thanks to Tim Parenti.)
  453 
  454     Commentary now uses some non-ASCII characters with Unicode value
  455     less than U+0100, as they can be useful and should work even with
  456     older editors such as XEmacs.
  457 
  458 
  459 Release 2018c - 2018-01-22 23:00:44 -0800
  460 
  461   Briefly:
  462   Revert Irish changes that relied on negative SAVE values.
  463 
  464   Changes to tm_isdst
  465 
  466     Revert the 2018a change to Europe/Dublin.  As before, this change
  467     does not affect UT offsets or abbreviations; it affects only
  468     whether timestamps are considered to be standard time or
  469     daylight-saving time, as expressed in the tm_isdst flag of C's
  470     struct tm type.  This reversion is intended to be a temporary
  471     workaround for problems discovered with downstream uses of
  472     releases 2018a and 2018b, which implemented Irish time by using
  473     negative SAVE values in the Eire rules of the 'europe' file.
  474     Although negative SAVE values have been part of tzcode for many
  475     years and are supported by many platforms, they were not
  476     documented before 2018a and ICU and OpenJDK do not currently
  477     support them.  A mechanism to export data to platforms lacking
  478     support for negative DST is planned to be developed before the
  479     change is reapplied.  (Problems reported by Deborah Goldsmith and
  480     Stephen Colebourne.)
  481 
  482   Changes to past timestamps
  483 
  484     Japanese DST transitions (1948-1951) were Sundays at 00:00, not
  485     Saturdays or Sundays at 02:00.  (Thanks to Takayuki Nikai.)
  486 
  487   Changes to build procedure
  488 
  489     The build procedure now works around mawk 1.3.3's lack of support
  490     for character class expressions.  (Problem reported by Ohyama.)
  491 
  492 
  493 Release 2018b - 2018-01-17 23:24:48 -0800
  494 
  495   Briefly:
  496   Fix a packaging problem in tz2018a, which was missing 'pacificnew'.
  497 
  498   Changes to build procedure
  499 
  500     The distribution now contains the file 'pacificnew' again.
  501     This file was inadvertantly omitted in the 2018a distribution.
  502     (Problem reported by Matias Fonzo.)
  503 
  504 
  505 Release 2018a - 2018-01-12 22:29:21 -0800
  506 
  507   Briefly:
  508   São Tomé and Príncipe switched from +00 to +01.
  509   Brazil's DST will now start on November's first Sunday.
  510   Ireland's standard time is now in the summer, not the winter.
  511   Use Debian-style installation locations, instead of 4.3BSD-style.
  512   New zic option -t.
  513 
  514   Changes to past and future timestamps
  515 
  516     São Tomé and Príncipe switched from +00 to +01 on 2018-01-01 at
  517     01:00.  (Thanks to Steffen Thorsen and Michael Deckers.)
  518 
  519   Changes to future timestamps
  520 
  521     Starting in 2018 southern Brazil will begin DST on November's
  522     first Sunday instead of October's third Sunday.  (Thanks to
  523     Steffen Thorsen.)
  524 
  525   Changes to past timestamps
  526 
  527     A discrepancy of 4 s in timestamps before 1931 in South Sudan has
  528     been corrected.  The 'backzone' and 'zone.tab' files did not agree
  529     with the 'africa' and 'zone1970.tab' files.  (Problem reported by
  530     Michael Deckers.)
  531 
  532     The abbreviation invented for Bolivia Summer Time (1931-2) is now
  533     BST instead of BOST, to be more consistent with the convention
  534     used for Latvian Summer Time (1918-9) and for British Summer Time.
  535 
  536   Changes to tm_isdst
  537 
  538     Change Europe/Dublin so that it observes Irish Standard Time (UT
  539     +01) in summer and GMT (as negative daylight-saving) in winter,
  540     instead of observing standard time (GMT) in winter and Irish
  541     Summer Time (UT +01) in summer.  This change does not affect UT
  542     offsets or abbreviations; it affects only whether timestamps are
  543     considered to be standard time or daylight-saving time, as
  544     expressed in the tm_isdst flag of C's struct tm type.
  545     (Discrepancy noted by Derick Rethans.)
  546 
  547   Changes to build procedure
  548 
  549     The default installation locations have been changed to mostly
  550     match Debian circa 2017, instead of being designed as an add-on to
  551     4.3BSD circa 1986.  This affects the Makefile macros TOPDIR,
  552     TZDIR, MANDIR, and LIBDIR.  New Makefile macros TZDEFAULT, USRDIR,
  553     USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor
  554     locations more precisely.  (This responds to suggestions from
  555     Brian Inglis and from Steve Summit.)
  556 
  557     The default installation procedure no longer creates the
  558     backward-compatibility link US/Pacific-New, which causes
  559     confusion during user setup (e.g., see Debian bug 815200).
  560     Use 'make BACKWARD="backward pacificnew"' to create the link
  561     anyway, for now.  Eventually we plan to remove the link entirely.
  562 
  563     tzdata.zi now contains a version-number comment.
  564     (Suggested by Tom Lane.)
  565 
  566     The Makefile now quotes values like BACKWARD more carefully when
  567     passing them to the shell.  (Problem reported by Zefram.)
  568 
  569     Builders no longer need to specify -DHAVE_SNPRINTF on platforms
  570     that have snprintf and use pre-C99 compilers.  (Problem reported
  571     by Jon Skeet.)
  572 
  573   Changes to code
  574 
  575     zic has a new option -t FILE that specifies the location of the
  576     file that determines local time when TZ is unset.  The default for
  577     this location can be configured via the new TZDEFAULT makefile
  578     macro, which defaults to /etc/localtime.
  579 
  580     Diagnostics and commentary now distinguish UT from UTC more
  581     carefully; see theory.html for more information about UT vs UTC.
  582 
  583     zic has been ported to GCC 8's -Wstringop-truncation option.
  584     (Problem reported by Martin Sebor.)
  585 
  586   Changes to documentation and commentary
  587 
  588     The zic man page now documents the longstanding behavior that
  589     times and years can be out of the usual range, with negative times
  590     counting backwards from midnight and with year 0 preceding year 1.
  591     (Problem reported by Michael Deckers.)
  592 
  593     The theory.html file now mentions the POSIX limit of six chars
  594     per abbreviation, and lists alphabetic abbreviations used.
  595 
  596     The files tz-art.htm and tz-link.htm have been renamed to
  597     tz-art.html and tz-link.html, respectively, for consistency with
  598     other file names and to simplify web server configuration.
  599 
  600 
  601 Release 2017c - 2017-10-20 14:49:34 -0700
  602 
  603   Briefly:
  604   Northern Cyprus switches from +03 to +02/+03 on 2017-10-29.
  605   Fiji ends DST 2018-01-14, not 2018-01-21.
  606   Namibia switches from +01/+02 to +02 on 2018-04-01.
  607   Sudan switches from +03 to +02 on 2017-11-01.
  608   Tonga likely switches from +13/+14 to +13 on 2017-11-05.
  609   Turks & Caicos switches from -04 to -05/-04 on 2018-11-04.
  610   A new file tzdata.zi now holds a small text copy of all data.
  611   The zic input format has been regularized slightly.
  612 
  613   Changes to future timestamps
  614 
  615     Northern Cyprus has decided to resume EU rules starting
  616     2017-10-29, thus reinstituting winter time.
  617 
  618     Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously
  619     predicted.  (Thanks to Dominic Fok.)  Adjust future predictions
  620     accordingly.
  621 
  622     Namibia will switch from +01 with DST to +02 all year on
  623     2017-09-03 at 02:00.  This affects UT offsets starting 2018-04-01
  624     at 02:00.  (Thanks to Steffen Thorsen.)
  625 
  626     Sudan will switch from +03 to +02 on 2017-11-01.  (Thanks to Ahmed
  627     Atyya and Yahia Abdalla.)  South Sudan is not switching, so
  628     Africa/Juba is no longer a link to Africa/Khartoum.
  629 
  630     Tonga has likely ended its experiment with DST, and will not
  631     adjust its clocks on 2017-11-05.  Although Tonga has not announced
  632     whether it will continue to observe DST, the IATA is assuming that
  633     it will not.  (Thanks to David Wade.)
  634 
  635     Turks & Caicos will switch from -04 all year to -05 with US DST on
  636     2018-03-11 at 03:00.  This affects UT offsets starting 2018-11-04
  637     at 02:00.  (Thanks to Steffen Thorsen.)
  638 
  639   Changes to past timestamps
  640 
  641     Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03.
  642     (Thanks to Arthur David Olson.)
  643 
  644     Detroit did not observe DST in 1967.
  645 
  646     Use railway time for Asia/Kolkata before 1941, by switching to
  647     Madras local time (UT +052110) in 1870, then to IST (UT +0530) in
  648     1906.  Also, treat 1941-2's +0630 as DST, like 1942-5.
  649 
  650     Europe/Dublin's 1946 and 1947 fallback transitions occurred at
  651     02:00 standard time, not 02:00 DST.  (Thanks to Michael Deckers.)
  652 
  653     Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to
  654     American time in 1892, not 1879.  (Thanks to Michael Deckers.)
  655 
  656     Adjust the 1867 transition in Alaska to better reflect the
  657     historical record, by changing it to occur on 1867-10-18 at 15:30
  658     Sitka time rather than at the start of 1867-10-17 local time.
  659     Although strictly speaking this is accurate only for Sitka,
  660     the rest of Alaska's blanks need to be filled in somehow.
  661 
  662     Fix off-by-one errors in UT offsets for Adak and Nome before 1867.
  663     (Thanks to Michael Deckers.)
  664 
  665     Add 7 s to the UT offset in Asia/Yangon before 1920.
  666 
  667   Changes to zone names
  668 
  669     Remove Canada/East-Saskatchewan from the 'backward' file, as it
  670     exceeded the 14-character limit and was an unused misnomer anyway.
  671 
  672   Changes to build procedure
  673 
  674     To support applications that prefer to read time zone data in text
  675     form, two zic input files tzdata.zi and leapseconds are now
  676     installed by default.  The commands 'zic tzdata.zi' and 'zic -L
  677     leapseconds tzdata.zi' can reproduce the tzdata binary files
  678     without and with leap seconds, respectively.  To prevent these two
  679     new files from being installed, use 'make TZDATA_TEXT=', and to
  680     suppress leap seconds from the tzdata text installation, use 'make
  681     TZDATA_TEXT=tzdata.zi'.
  682 
  683     'make BACKWARD=' now suppresses backward-compatibility names
  684     like 'US/Pacific' that are defined in the 'backward' and
  685     'pacificnew' files.
  686 
  687     'make check' now works on systems that lack a UTF-8 locale,
  688     or that lack the nsgmls program.  Set UTF8_LOCALE to configure
  689     the name of a UTF-8 locale, if you have one.
  690 
  691     Y2K runtime checks are no longer enabled by default.  Add
  692     -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of
  693     adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU
  694     to disable them.  (New name suggested by Brian Inglis.)
  695 
  696     The build procedure for zdump now works on AIX 7.1.
  697     (Problem reported by Kees Dekker.)
  698 
  699   Changes to code
  700 
  701     zic and the reference runtime now reject multiple leap seconds
  702     within 28 days of each other, or leap seconds before the Epoch.
  703     As a result, support for double leap seconds, which was
  704     obsolescent and undocumented, has been removed.  Double leap
  705     seconds were an error in the C89 standard; they have never existed
  706     in civil timekeeping.  (Thanks to Robert Elz and Bradley White for
  707     noticing glitches in the code that uncovered this problem.)
  708 
  709     zic now warns about use of the obsolescent and undocumented -y
  710     option, and about use of the obsolescent TYPE field of Rule lines.
  711 
  712     zic now allows unambiguous abbreviations like "Sa" and "Su" for
  713     weekdays; formerly it rejected them due to a bug.  Conversely, zic
  714     no longer considers non-prefixes to be abbreviations; for example,
  715     it no longer accepts "lF" as an abbreviation for "lastFriday".
  716     Also, zic warns about the undocumented usage with a "last-"
  717     prefix, e.g., "last-Fri".
  718 
  719     Similarly, zic now accepts the unambiguous abbreviation "L" for
  720     "Link" in ordinary context and for "Leap" in leap-second context.
  721     Conversely, zic no longer accepts non-prefixes such as "La" as
  722     abbreviations for words like "Leap".
  723 
  724     zic no longer accepts leap second lines in ordinary input, or
  725     ordinary lines in leap second input.  Formerly, zic sometimes
  726     warned about this undocumented usage and handled it incorrectly.
  727 
  728     The new macro HAVE_TZNAME governs whether the tzname external
  729     variable is exported, instead of USG_COMPAT.  USG_COMPAT now
  730     governs only the external variables "timezone" and "daylight".
  731     This change is needed because the three variables are not in the
  732     same category: although POSIX requires tzname, it specifies the
  733     other two variables as optional.  Also, USG_COMPAT is now 1 or 0:
  734     if not defined, the code attempts to guess it from other macros.
  735 
  736     localtime.c and difftime.c no longer require stdio.h, and .c files
  737     other than zic.c no longer require sys/wait.h.
  738 
  739     zdump.c no longer assumes snprintf.  (Reported by Jonathan Leffler.)
  740 
  741     Calculation of time_t extrema works around a bug in GCC 4.8.4
  742     (Reported by Stan Shebs and Joseph Myers.)
  743 
  744     zic.c no longer mistranslates formats of line numbers in non-English
  745     locales.  (Problem reported by Benno Schulenberg.)
  746 
  747     Several minor changes have been made to the code to make it a
  748     bit easier to port to MS-Windows and Solaris.  (Thanks to Kees
  749     Dekker for reporting the problems.)
  750 
  751   Changes to documentation and commentary
  752 
  753     The two new files 'theory.html' and 'calendars' contain the
  754     contents of the removed file 'Theory'.  The goal is to document
  755     tzdb theory more accessibly.
  756 
  757     The zic man page now documents abbreviation rules.
  758 
  759     tz-link.htm now covers how to apply tzdata changes to clients.
  760     (Thanks to Jorge Fábregas for the AIX link.)  It also mentions MySQL.
  761 
  762     The leap-seconds.list URL has been updated to something that is
  763     more reliable for tzdb.  (Thanks to Tim Parenti and Brian Inglis.)
  764 
  765 Release 2017b - 2017-03-17 07:30:38 -0700
  766 
  767   Briefly: Haiti has resumed DST.
  768 
  769   Changes to past and future timestamps
  770 
  771     Haiti resumed observance of DST in 2017.  (Thanks to Steffen Thorsen.)
  772 
  773   Changes to past timestamps
  774 
  775     Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01.
  776 
  777     Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430"
  778     is one byte over the POSIX limit.  (Problem reported by Derick Rethans.)
  779 
  780   Changes to code
  781 
  782     The reference localtime implementation now falls back on the
  783     current US daylight-saving transition rules rather than the
  784     1987-2006 rules.  This fallback occurs only when (1) the TZ
  785     environment variable has a value like "AST4ADT" that asks
  786     for daylight saving time but does not specify the rules, (2) there
  787     is no file by that name, and (3) the TZDEFRULES file cannot be
  788     loaded.  (Thanks to Tom Lane.)
  789 
  790 
  791 Release 2017a - 2017-02-28 00:05:36 -0800
  792 
  793   Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia
  794   discontinues DST.
  795 
  796   Changes to future timestamps
  797 
  798     Mongolia no longer observes DST.  (Thanks to Ganbold Tsagaankhuu.)
  799 
  800     Chile's Region of Magallanes moves from -04/-03 to -03 year-round.
  801     Its clocks diverge from America/Santiago starting 2017-05-13 at
  802     23:00, hiving off a new zone America/Punta_Arenas.  Although the
  803     Chilean government says this change expires in May 2019, for now
  804     assume it's permanent.  (Thanks to Juan Correa and Deborah
  805     Goldsmith.)  This also affects Antarctica/Palmer.
  806 
  807   Changes to past timestamps
  808 
  809     Fix many entries for historical timestamps for Europe/Madrid
  810     before 1979, to agree with tables compiled by Pere Planesas of the
  811     National Astronomical Observatory of Spain.  As a side effect,
  812     this changes some timestamps for Africa/Ceuta before 1929, which
  813     are probably guesswork anyway.  (Thanks to Steve Allen and
  814     Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for
  815     correcting the 1901 transition.)
  816 
  817     Ecuador observed DST from 1992-11-28 to 1993-02-05.
  818     (Thanks to Alois Treindl.)
  819 
  820     Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21.
  821     (Thanks to Stepan Golosunov.)
  822 
  823   Changes to past and future time zone abbreviations
  824 
  825     Switch to numeric time zone abbreviations for South America, as
  826     part of the ongoing project of removing invented abbreviations.
  827     This avoids the need to invent an abbreviation for the new Chilean
  828     new zone.  Similarly, switch from invented to numeric time zone
  829     abbreviations for Afghanistan, American Samoa, the Azores,
  830     Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei,
  831     Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is,
  832     Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland,
  833     Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia,
  834     the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia,
  835     Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau,
  836     Papua New Guinea, the Philippines, Pitcairn, Qatar, Réunion, St
  837     Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore,
  838     Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and
  839     Xinjiang; for 20-minute daylight saving time in Ghana before 1943;
  840     for half-hour daylight saving time in Belize before 1944 and in
  841     the Dominican Republic before 1975; and for Canary Islands before
  842     1946, for Guinea-Bissau before 1975, for Iceland before 1969, for
  843     Indian Summer Time before 1942, for Indonesia before around 1964,
  844     for Kenya before 1960, for Liberia before 1973, for Madeira before
  845     1967, for Namibia before 1943, for the Netherlands in 1937-9, for
  846     Pakistan before 1971, for Western Sahara before 1977, and for
  847     Zaporozhye in 1880-1924.
  848 
  849     For Alaska time from 1900 through 1967, instead of "CAT" use the
  850     abbreviation "AST", the abbreviation commonly used at the time
  851     (Atlantic Standard Time had not been standardized yet).  Use "AWT"
  852     and "APT" instead of the invented abbreviations "CAWT" and "CAPT".
  853 
  854     Use "CST" and "CDT" instead of invented abbreviations for Macau
  855     before 1999 and Taiwan before 1938, and use "JST" instead of the
  856     invented abbreviation "JCST" for Japan and Korea before 1938.
  857 
  858   Change to database entry category
  859 
  860     Move the Pacific/Johnston link from 'australasia' to 'backward',
  861     since Johnston is now uninhabited.
  862 
  863   Changes to code
  864 
  865     zic no longer mishandles some transitions in January 2038 when it
  866     attempts to work around Qt bug 53071.  This fixes a bug affecting
  867     Pacific/Tongatapu that was introduced in zic 2016e.  localtime.c
  868     now contains a workaround, useful when loading a file generated by
  869     a buggy zic.  (Problem and localtime.c fix reported by Bradley
  870     White.)
  871 
  872     zdump -i now outputs non-hour numeric time zone abbreviations
  873     without a colon, e.g., "+0530" rather than "+05:30".  This agrees
  874     with zic %z and with common practice, and simplifies auditing of
  875     zdump output.
  876 
  877     zdump is now buildable again with -DUSE_LTZ=0.
  878     (Problem reported by Joseph Myers.)
  879 
  880     zdump.c now always includes private.h, to avoid code duplication
  881     with private.h.  (Problem reported by Kees Dekker.)
  882 
  883     localtime.c no longer mishandles early or late timestamps
  884     when TZ is set to a POSIX-style string that specifies DST.
  885     (Problem reported by Kees Dekker.)
  886 
  887     date and strftime now cause %z to generate "-0000" instead of
  888     "+0000" when the UT offset is zero and the time zone abbreviation
  889     begins with "-".
  890 
  891   Changes to documentation and commentary
  892 
  893     The 'Theory' file now better documents choice of historical time
  894     zone abbreviations.  (Problems reported by Michael Deckers.)
  895 
  896     tz-link.htm now covers leap smearing, which is popular in clouds.
  897 
  898 
  899 Release 2016j - 2016-11-22 23:17:13 -0800
  900 
  901   Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04.
  902 
  903   Changes to future timestamps
  904 
  905     Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00.
  906     This hives off a new zone Europe/Saratov from Europe/Volgograd.
  907     (Thanks to Yuri Konotopov and Stepan Golosunov.)
  908 
  909   Changes to past timestamps
  910 
  911     The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like
  912     Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring
  913     1999, not fall 1994.  (Thanks to Stepan Golosunov.)
  914 
  915   Changes to past time zone abbreviations
  916 
  917     Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote
  918     summer time before 1948.  The old use of "EET" was a typo.
  919 
  920   Changes to code
  921 
  922     zic no longer mishandles file systems that lack hard links, fixing
  923     bugs introduced in 2016g.  (Problems reported by Tom Lane.)
  924     Also, when the destination already contains symbolic links, zic
  925     should now work better on systems where the 'link' system call
  926     does not follow symbolic links.
  927 
  928   Changes to documentation and commentary
  929 
  930     tz-link.htm now documents the relationship between release version
  931     numbers and development-repository commit tags.  (Suggested by
  932     Paul Koning.)
  933 
  934     The 'Theory' file now documents UT.
  935 
  936     iso3166.tab now accents "Curaçao", and commentary now mentions
  937     the names "Cabo Verde" and "Czechia".  (Thanks to Jiří Boháč.)
  938 
  939 
  940 Release 2016i - 2016-11-01 23:19:52 -0700
  941 
  942   Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga
  943   reintroduces DST on 2016-11-06.
  944 
  945   Changes to future timestamps
  946 
  947     Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on
  948     2017-01-15 at 03:00.  Assume future observances in Tonga will be
  949     from the first Sunday in November through the third Sunday in
  950     January, like Fiji.  (Thanks to Pulu ʻAnau.)  Switch to numeric
  951     time zone abbreviations for this zone.
  952 
  953   Changes to past and future timestamps
  954 
  955     Northern Cyprus is now +03 year round, causing a split in Cyprus
  956     time zones starting 2016-10-30 at 04:00.  This creates a zone
  957     Asia/Famagusta.  (Thanks to Even Scharning and Matt Johnson.)
  958 
  959     Antarctica/Casey switched from +08 to +11 on 2016-10-22.
  960     (Thanks to Steffen Thorsen.)
  961 
  962   Changes to past timestamps
  963 
  964     Several corrections were made for pre-1975 timestamps in Italy.
  965     These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and
  966     Europe/Vatican.
  967 
  968     First, the 1893-11-01 00:00 transition in Italy used the new UT
  969     offset (+01), not the old (+00:49:56).  (Thanks to Michael
  970     Deckers.)
  971 
  972     Second, rules for daylight saving in Italy were changed to agree
  973     with Italy's National Institute of Metrological Research (INRiM)
  974     except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian
  975     Inglis, and Michael Deckers):
  976 
  977       The 1916-06-03 transition was at 24:00, not 00:00.
  978 
  979       The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at
  980       00:00, not 01:00.
  981 
  982       The 1917-09-30 and 1918-10-06 transitions were at 24:00, not
  983       01:00.
  984 
  985       The 1944-09-17 transition was at 03:00, not 01:00.  This
  986       particular change is taken from Italian law as INRiM's table,
  987       (which says 02:00) appears to have a typo here.  Also, keep the
  988       1944-04-03 transition for Europe/Rome, as Rome was controlled by
  989       Germany then.
  990 
  991       The 1967-1970 and 1972-1974 fallback transitions were at 01:00,
  992       not 00:00.
  993 
  994   Changes to code
  995 
  996     The code should now be buildable on AmigaOS merely by setting the
  997     appropriate Makefile variables.  (From a patch by Carsten Larsen.)
  998 
  999 
 1000 Release 2016h - 2016-10-19 23:17:57 -0700
 1001 
 1002   Changes to future timestamps
 1003 
 1004     Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not
 1005     2016-10-21 at 00:00.  (Thanks to Sharef Mustafa.)  Predict that
 1006     future fall transitions will be on the last Saturday of October
 1007     at 01:00, which is consistent with predicted spring transitions
 1008     on the last Saturday of March.  (Thanks to Tim Parenti.)
 1009 
 1010   Changes to past timestamps
 1011 
 1012     In Turkey, transitions in 1986-1990 were at 01:00 standard time
 1013     not at 02:00, and the spring 1994 transition was on March 20, not
 1014     March 27.  (Thanks to Kıvanç Yazan.)
 1015 
 1016   Changes to past and future time zone abbreviations
 1017 
 1018     Asia/Colombo now uses numeric time zone abbreviations like "+0530"
 1019     instead of alphabetic ones like "IST" and "LKT".  Various
 1020     English-language sources use "IST", "LKT" and "SLST", with no
 1021     working consensus.  (Usage of "SLST" mentioned by Sadika
 1022     Sumanapala.)
 1023 
 1024   Changes to code
 1025 
 1026     zic no longer mishandles relativizing file names when creating
 1027     symbolic links like /etc/localtime, when these symbolic links
 1028     are outside the usual directory hierarchy.  This fixes a bug
 1029     introduced in 2016g.  (Problem reported by Andreas Stieger.)
 1030 
 1031   Changes to build procedure
 1032 
 1033     New rules 'traditional_tarballs' and 'traditional_signatures' for
 1034     building just the traditional-format distribution.  (Requested by
 1035     Deborah Goldsmith.)
 1036 
 1037     The file 'version' is now put into the tzdata tarball too.
 1038     (Requested by Howard Hinnant.)
 1039 
 1040   Changes to documentation and commentary
 1041 
 1042     The 'Theory' file now has a section on interface stability.
 1043     (Requested by Paul Koning.)  It also mentions features like
 1044     tm_zone and localtime_rz that have long been supported by the
 1045     reference code.
 1046 
 1047     tz-link.htm has improved coverage of time zone boundaries suitable
 1048     for geolocation.  (Thanks to heads-ups from Evan Siroky and Matt
 1049     Johnson.)
 1050 
 1051     The US commentary now mentions Allen and the "day of two noons".
 1052 
 1053     The Fiji commentary mentions the government's 2016-10-03 press
 1054     release.  (Thanks to Raymond Kumar.)
 1055 
 1056 
 1057 Release 2016g - 2016-09-13 08:56:38 -0700
 1058 
 1059   Changes to future timestamps
 1060 
 1061     Turkey switched from EET/EEST (+02/+03) to permanent +03,
 1062     effective 2016-09-07.  (Thanks to Burak AYDIN.)  Use "+03" rather
 1063     than an invented abbreviation for the new time.
 1064 
 1065     New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52.
 1066     (Thanks to Tim Parenti.)
 1067 
 1068   Changes to past timestamps
 1069 
 1070     For America/Los_Angeles, spring-forward transition times have been
 1071     corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in
 1072     1950-1966.
 1073 
 1074     For zones using Soviet time on 1919-07-01, transitions to UT-based
 1075     time were at 00:00 UT, not at 02:00 local time.  The affected
 1076     zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and
 1077     Europe/Ulyanovsk.  (Thanks to Alexander Belopolsky.)
 1078 
 1079   Changes to past and future time zone abbreviations
 1080 
 1081     The Factory zone now uses the time zone abbreviation -00 instead
 1082     of a long English-language string, as -00 is now the normal way to
 1083     represent an undefined time zone.
 1084 
 1085     Several zones in Antarctica and the former Soviet Union, along
 1086     with zones intended for ships at sea that cannot use POSIX TZ
 1087     strings, now use numeric time zone abbreviations instead of
 1088     invented or obsolete alphanumeric abbreviations.  The affected
 1089     zones are Antarctica/Casey, Antarctica/Davis,
 1090     Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera,
 1091     Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok,
 1092     Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita,
 1093     Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga,
 1094     Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin,
 1095     Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi,
 1096     Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg,
 1097     Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11,
 1098     Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5,
 1099     Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2,
 1100     Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8,
 1101     Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad,
 1102     Europe/Minsk, Europe/Samara, Europe/Volgograd, and
 1103     Indian/Kerguelen.  For Europe/Moscow the invented abbreviation MSM
 1104     was replaced by +05, whereas MSK and MSD were kept as they are not
 1105     our invention and are widely used.
 1106 
 1107   Changes to zone names
 1108 
 1109     Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link.
 1110     (Thanks to David Massoud.)
 1111 
 1112   Changes to code
 1113 
 1114     zic no longer generates binary files containing POSIX TZ-like
 1115     strings that disagree with the local time type after the last
 1116     explicit transition in the data.  This fixes a bug with
 1117     Africa/Casablanca and Africa/El_Aaiun in some year-2037 timestamps
 1118     on the reference platform.  (Thanks to Alexander Belopolsky for
 1119     reporting the bug and suggesting a way forward.)
 1120 
 1121     If the installed localtime and/or posixrules files are symbolic
 1122     links, zic now keeps them symbolic links when updating them, for
 1123     compatibility with platforms like OpenSUSE where other programs
 1124     configure these files as symlinks.
 1125 
 1126     zic now avoids hard linking to symbolic links, avoids some
 1127     unnecessary mkdir and stat system calls, and uses shorter file
 1128     names internally.
 1129 
 1130     zdump has a new -i option to generate transitions in a
 1131     more-compact but still human-readable format.  This option is
 1132     experimental, and the output format may change in future versions.
 1133     (Thanks to Jon Skeet for suggesting that an option was needed,
 1134     and thanks to Tim Parenti and Chris Rovick for further comments.)
 1135 
 1136   Changes to build procedure
 1137 
 1138     An experimental distribution format is available, in addition
 1139     to the traditional format which will continue to be distributed.
 1140     The new format is a tarball tzdb-VERSION.tar.lz with signature
 1141     file tzdb-VERSION.tar.lz.asc.  It unpacks to a top-level directory
 1142     tzdb-VERSION containing the code and data of the traditional
 1143     two-tarball format, along with extra data that may be useful.
 1144     (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others
 1145     for comments about the experimental format.)
 1146 
 1147     The release version number is now more accurate in the usual case
 1148     where releases are built from a Git repository.  For example, if
 1149     23 commits and some working-file changes have been made since
 1150     release 2016g, the version number is now something like
 1151     '2016g-23-g50556e3-dirty' instead of the misleading '2016g'.
 1152     Tagged releases use the same version number format as before,
 1153     e.g., '2016g'.  To support the more-accurate version number, its
 1154     specification has moved from a line in the Makefile to a new
 1155     source file 'version'.
 1156 
 1157     The experimental distribution contains a file to2050.tzs that
 1158     contains what should be the output of 'zdump -i -c 2050' on
 1159     primary zones.  If this file is available, 'make check' now checks
 1160     that zdump generates this output.
 1161 
 1162     'make check_web' now works on Fedora-like distributions.
 1163 
 1164   Changes to documentation and commentary
 1165 
 1166     tzfile.5 now documents the new restriction on POSIX TZ-like
 1167     strings that is now implemented by zic.
 1168 
 1169     Comments now cite URLs for some 1917-1921 Russian DST decrees.
 1170     (Thanks to Alexander Belopolsky.)
 1171 
 1172     tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J
 1173     (thanks to Meno Hochschild) and ThreeTen-Extra, and its
 1174     description of Java 8 has been brought up to date (thanks to
 1175     Stephen Colebourne).  Its description of local time on Mars has
 1176     been updated to match current practice, and URLs have been updated
 1177     and some obsolete ones removed.
 1178 
 1179 
 1180 Release 2016f - 2016-07-05 16:26:51 +0200
 1181 
 1182   Changes affecting future timestamps
 1183 
 1184     The Egyptian government changed its mind on short notice, and
 1185     Africa/Cairo will not introduce DST starting 2016-07-07 after all.
 1186     (Thanks to Mina Samuel.)
 1187 
 1188     Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00.
 1189     (Thanks to Stepan Golosunov.)
 1190 
 1191   Changes to past and future timestamps
 1192 
 1193     Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone
 1194     abbreviations instead of invented ones.
 1195 
 1196   Changes affecting past timestamps
 1197 
 1198     Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00.
 1199     (Thanks to Stepan Golosunov.)
 1200 
 1201 
 1202 Release 2016e - 2016-06-14 08:46:16 -0700
 1203 
 1204   Changes affecting future timestamps
 1205 
 1206     Africa/Cairo observes DST in 2016 from July 7 to the end of October.
 1207     Guess October 27 and 24:00 transitions.  (Thanks to Steffen Thorsen.)
 1208     For future years, guess April's last Thursday to October's last
 1209     Thursday except for Ramadan.
 1210 
 1211   Changes affecting past timestamps
 1212 
 1213     Locations while uninhabited now use '-00', not 'zzz', as a
 1214     placeholder time zone abbreviation.  This is inspired by Internet
 1215     RFC 3339 and is more consistent with numeric time zone
 1216     abbreviations already used elsewhere.  The change affects several
 1217     arctic and antarctic locations, e.g., America/Cambridge_Bay before
 1218     1920 and Antarctica/Troll before 2005.
 1219 
 1220     Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was
 1221     at 03:00, not 23:00 the previous day.  (Thanks to Michael Deckers.)
 1222 
 1223   Changes to code
 1224 
 1225     zic now outputs a dummy transition at time 2**31 - 1 in zones
 1226     whose POSIX-style TZ strings contain a '<'.  This mostly works
 1227     around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>.
 1228     (Thanks to Zhanibek Adilbekov for reporting the Qt bug.)
 1229 
 1230   Changes affecting documentation and commentary
 1231 
 1232     tz-link.htm says why governments should give plenty of notice for
 1233     time zone or DST changes, and refers to Matt Johnson's blog post.
 1234 
 1235     tz-link.htm mentions Tzdata for Elixir.  (Thanks to Matt Johnson.)
 1236 
 1237 
 1238 Release 2016d - 2016-04-17 22:50:29 -0700
 1239 
 1240   Changes affecting future timestamps
 1241 
 1242     America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30.
 1243     (Thanks to Alexander Krivenyshev for the heads-up.)
 1244 
 1245     Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00.
 1246     (Thanks to Alexander Krivenyshev and Matt Johnson.)
 1247 
 1248     New zone Asia/Tomsk, split off from Asia/Novosibirsk.  It covers
 1249     Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29
 1250     at 02:00.  (Thanks to Stepan Golosunov.)
 1251 
 1252   Changes affecting past timestamps
 1253 
 1254     New zone Europe/Kirov, split off from Europe/Volgograd.  It covers
 1255     Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on
 1256     1989-03-26 at 02:00, roughly a year after Europe/Volgograd made
 1257     the same change.  (Thanks to Stepan Golosunov.)
 1258 
 1259     Russia and nearby locations had daylight-saving transitions on
 1260     1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on
 1261     1992-03-28 at 23:00 and 1992-09-26 at 23:00.  (Thanks to Stepan
 1262     Golosunov.)
 1263 
 1264     Many corrections to historical time in Kazakhstan from 1991
 1265     through 2005.  (Thanks to Stepan Golosunov.)  Replace Kazakhstan's
 1266     invented time zone abbreviations with numeric abbreviations.
 1267 
 1268   Changes to commentary
 1269 
 1270     Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references).
 1271 
 1272 
 1273 Release 2016c - 2016-03-23 00:51:27 -0700
 1274 
 1275   Changes affecting future timestamps
 1276 
 1277     Azerbaijan no longer observes DST.  (Thanks to Steffen Thorsen.)
 1278 
 1279     Chile reverts from permanent to seasonal DST.  (Thanks to Juan
 1280     Correa for the heads-up, and to Tim Parenti for corrections.)
 1281     Guess that future transitions are August's and May's second
 1282     Saturdays at 24:00 mainland time.  Also, call the period from
 1283     2014-09-07 through 2016-05-14 daylight saving time instead of
 1284     standard time, as that seems more appropriate now.
 1285 
 1286   Changes affecting past timestamps
 1287 
 1288     Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to
 1289     +02/+03 on 1989-03-26, not 1991-03-31.  Europe/Volgograd changed
 1290     from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26.
 1291     (Thanks to Stepan Golosunov.)
 1292 
 1293   Changes to commentary
 1294 
 1295     Several updates and URLs for historical and proposed Russian changes.
 1296     (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.)
 1297 
 1298 
 1299 Release 2016b - 2016-03-12 17:30:14 -0800
 1300 
 1301   Compatibility note
 1302 
 1303     Starting with release 2016b, some data entries cause zic implementations
 1304     derived from tz releases 2005j through 2015e to issue warnings like
 1305     "time zone abbreviation differs from POSIX standard (+03)".
 1306     These warnings should not otherwise affect zic's output and can safely be
 1307     ignored on today's platforms, as the warnings refer to a restriction in
 1308     POSIX.1-1988 that was removed in POSIX.1-2001.  One way to suppress the
 1309     warnings is to upgrade to zic derived from tz releases 2015f and later.
 1310 
 1311   Changes affecting future timestamps
 1312 
 1313     New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and
 1314     Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on
 1315     2016-03-27 at 02:00 local time.  They need distinct zones since their
 1316     post-1970 histories disagree.  New zone Asia/Barnaul for Altai Krai and
 1317     Altai Republic, Russia, which will switch from +06 to +07 on the same date
 1318     and local time.  The Astrakhan change is already official; the others have
 1319     passed the first reading in the State Duma and are extremely likely.
 1320     Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00.
 1321     (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson
 1322     and Stepan Golosunov for followup.)
 1323 
 1324     As a trial of a new system that needs less information to be made up,
 1325     the new zones use numeric time zone abbreviations like "+04"
 1326     instead of invented abbreviations like "ASTT".
 1327 
 1328     Haiti will not observe DST in 2016.  (Thanks to Jean Antoine via
 1329     Steffen Thorsen.)
 1330 
 1331     Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00.
 1332     (Thanks to Hannah Kreitem.) Guess future transitions will be March's last
 1333     Saturday at 01:00, not March's last Friday at 24:00.
 1334 
 1335   Changes affecting past timestamps
 1336 
 1337     Europe/Chisinau observed DST during 1990, and switched from +04 to
 1338     +03 at 1990-05-06 02:00, instead of switching from +03 to +02.
 1339     (Thanks to Stepan Golosunov.)
 1340 
 1341     1991 abbreviations in Europe/Samara should be SAMT/SAMST, not
 1342     KUYT/KUYST.  (Thanks to Stepan Golosunov.)
 1343 
 1344   Changes to code
 1345 
 1346     tzselect's diagnostics and checking, and checktab.awk's checking,
 1347     have been improved.  (Thanks to J William Piggott.)
 1348 
 1349     tzcode now builds under MinGW.  (Thanks to Ian Abbott and Esben Haabendal.)
 1350 
 1351     tzselect now tests Julian-date TZ settings more accurately.
 1352     (Thanks to J William Piggott.)
 1353 
 1354   Changes to commentary
 1355 
 1356     Comments in zone tables have been improved.  (Thanks to J William Piggott.)
 1357 
 1358     tzselect again limits its menu comments so that menus fit on a
 1359     24×80 alphanumeric display.
 1360 
 1361     A new web page tz-how-to.html.  (Thanks to Bill Seymour.)
 1362 
 1363     In the Theory file, the description of possible time zone abbreviations in
 1364     tzdata has been cleaned up, as the old description was unclear and
 1365     inconsistent.  (Thanks to Alain Mouette for reporting the problem.)
 1366 
 1367 
 1368 Release 2016a - 2016-01-26 23:28:02 -0800
 1369 
 1370   Changes affecting future timestamps
 1371 
 1372     America/Cayman will not observe daylight saving this year after all.
 1373     Revert our guess that it would.  (Thanks to Matt Johnson.)
 1374 
 1375     Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00.
 1376     (Thanks to Alexander Krivenyshev.)
 1377 
 1378     Asia/Tehran now has DST predictions for the year 2038 and later,
 1379     to be March 21 00:00 to September 21 00:00.  This is likely better
 1380     than predicting no DST, albeit off by a day every now and then.
 1381 
 1382   Changes affecting past and future timestamps
 1383 
 1384     America/Metlakatla switched from PST all year to AKST/AKDT on
 1385     2015-11-01 at 02:00.  (Thanks to Steffen Thorsen.)
 1386 
 1387     America/Santa_Isabel has been removed, and replaced with a
 1388     backward compatibility link to America/Tijuana.  Its contents were
 1389     apparently based on a misreading of Mexican legislation.
 1390 
 1391   Changes affecting past timestamps
 1392 
 1393     Asia/Karachi's two transition times in 2002 were off by a minute.
 1394     (Thanks to Matt Johnson.)
 1395 
 1396   Changes affecting build procedure
 1397 
 1398     An installer can now combine leap seconds with use of the backzone file,
 1399     e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'.
 1400     The old 'make posix_packrat' rule is now marked as obsolescent.
 1401     (Thanks to Ian Abbott for an initial implementation.)
 1402 
 1403   Changes affecting documentation and commentary
 1404 
 1405     A new file LICENSE makes it easier to see that the code and data
 1406     are mostly public-domain.  (Thanks to James Knight.)  The three
 1407     non-public-domain files now use the current (3-clause) BSD license
 1408     instead of older versions of that license.
 1409 
 1410     tz-link.htm mentions the BDE library (thanks to Andrew Paprocki),
 1411     CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section
 1412     on editing tz source files (with a mention of Sublime zoneinfo,
 1413     thanks to Gilmore Davidson).
 1414 
 1415     The Theory and asia files now mention the 2015 book "The Global
 1416     Transformation of Time, 1870-1950", and cite a couple of reviews.
 1417 
 1418     The America/Chicago entry now documents the informal use of US
 1419     central time in Fort Pierre, South Dakota.  (Thanks to Rick
 1420     McDermid, Matt Johnson, and Steve Jones.)
 1421 
 1422 
 1423 Release 2015g - 2015-10-01 00:39:51 -0700
 1424 
 1425   Changes affecting future timestamps
 1426 
 1427     Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25.
 1428     (Thanks to Fatih.)
 1429 
 1430     Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time.
 1431     (Thanks to Alexander Krivenyshev.)
 1432 
 1433     Fiji's 2016 fall-back transition is scheduled for January 17, not 24.
 1434     (Thanks to Ken Rylander.)
 1435 
 1436     Fort Nelson, British Columbia will not fall back on 2015-11-01.  It has
 1437     effectively been on MST (-0700) since it advanced its clocks on 2015-03-08.
 1438     New zone America/Fort_Nelson.  (Thanks to Matt Johnson.)
 1439 
 1440   Changes affecting past timestamps
 1441 
 1442     Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00.
 1443 
 1444   Changes affecting code
 1445 
 1446     localtime no longer mishandles America/Anchorage after 2037.
 1447     (Thanks to Bradley White for reporting the bug.)
 1448 
 1449     On hosts with signed 32-bit time_t, localtime no longer mishandles
 1450     Pacific/Fiji after 2038-01-16 14:00 UTC.
 1451 
 1452     The localtime module allows the variables 'timezone', 'daylight',
 1453     and 'altzone' to be in common storage shared with other modules,
 1454     and declares them in case the system <time.h> does not.
 1455     (Problems reported by Kees Dekker.)
 1456 
 1457     On platforms with tm_zone, strftime.c now assumes it is not NULL.
 1458     This simplifies the code and is consistent with zdump.c.
 1459     (Problem reported by Christos Zoulas.)
 1460 
 1461   Changes affecting documentation
 1462 
 1463    The tzfile man page now documents that transition times denote the
 1464    starts (not the ends) of the corresponding time periods.
 1465    (Ambiguity reported by Bill Seymour.)
 1466 
 1467 
 1468 Release 2015f - 2015-08-10 18:06:56 -0700
 1469 
 1470   Changes affecting future timestamps
 1471 
 1472     North Korea switches to +0830 on 2015-08-15.  (Thanks to Steffen Thorsen.)
 1473     The abbreviation remains "KST".  (Thanks to Robert Elz.)
 1474 
 1475     Uruguay no longer observes DST.  (Thanks to Steffen Thorsen
 1476     and Pablo Camargo.)
 1477 
 1478   Changes affecting past and future timestamps
 1479 
 1480     Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC.
 1481     (Thanks to Roman Tudos.)
 1482 
 1483   Changes affecting data format and code
 1484 
 1485     zic's '-y YEARISTYPE' option is no longer documented.  The TYPE
 1486     field of a Rule line should now be '-'; the old values 'even',
 1487     'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented.
 1488     Although the implementation has not changed, these features do not
 1489     work in the default installation, they are not used in the data,
 1490     and they are now considered obsolescent.
 1491 
 1492     zic now checks that two rules don't take effect at the same time.
 1493     (Thanks to Jon Skeet and Arthur David Olson.)  Constraints on
 1494     simultaneity are now documented.
 1495 
 1496     The two characters '%z' in a zone format now stand for the UT
 1497     offset, e.g., '-07' for seven hours behind UT and '+0530' for
 1498     five hours and thirty minutes ahead.  This better supports time
 1499     zone abbreviations conforming to POSIX.1-2001 and later.
 1500 
 1501   Changes affecting installed data files
 1502 
 1503     Comments for America/Halifax and America/Glace_Bay have been improved.
 1504     (Thanks to Brian Inglis.)
 1505 
 1506     Data entries have been simplified for Atlantic/Canary, Europe/Simferopol,
 1507     Europe/Sofia, and Europe/Tallinn.  This yields slightly smaller
 1508     installed data files for Europe/Simferopol and Europe/Tallinn.
 1509     It does not affect timestamps.  (Thanks to Howard Hinnant.)
 1510 
 1511   Changes affecting code
 1512 
 1513     zdump and zic no longer warn about valid time zone abbreviations
 1514     like '-05'.
 1515 
 1516     Some Visual Studio 2013 warnings have been suppressed.
 1517     (Thanks to Kees Dekker.)
 1518 
 1519     'date' no longer sets the time of day and its -a, -d, -n and -t
 1520     options have been removed.  Long obsolescent, the implementation
 1521     of these features had porting problems.  Builders no longer need
 1522     to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H.
 1523     (Thanks to Kees Dekker for pointing out the problem.)
 1524 
 1525   Changes affecting documentation
 1526 
 1527     The Theory file mentions naming issues earlier, as these seem to be
 1528     poorly publicized (thanks to Gilmore Davidson for reporting the problem).
 1529 
 1530     tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant).
 1531 
 1532     Mention that Herbert Samuel introduced the term "Summer Time".
 1533 
 1534 
 1535 Release 2015e - 2015-06-13 10:56:02 -0700
 1536 
 1537   Changes affecting future timestamps
 1538 
 1539     Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00,
 1540     not 06-13 and 07-18 as we had guessed.  (Thanks to Milamber.)
 1541 
 1542     Assume Cayman Islands will observe DST starting next year, using US rules.
 1543     Although it isn't guaranteed, it is the most likely.
 1544 
 1545   Changes affecting data format
 1546 
 1547     The file 'iso3166.tab' now uses UTF-8, so that its entries can better
 1548     spell the names of Åland Islands, Côte d'Ivoire, and Réunion.
 1549 
 1550   Changes affecting code
 1551 
 1552     When displaying data, tzselect converts it to the current locale's
 1553     encoding if the iconv command works.  (Problem reported by random832.)
 1554 
 1555     tzselect no longer mishandles Dominica, fixing a bug introduced
 1556     in Release 2014f.  (Problem reported by Owen Leibman.)
 1557 
 1558     zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\".
 1559     This fixes a bug introduced in Release 2014f.
 1560     (Problem reported by Leonardo Chiquitto.)
 1561 
 1562 
 1563 Release 2015d - 2015-04-24 08:09:46 -0700
 1564 
 1565   Changes affecting future timestamps
 1566 
 1567     Egypt will not observe DST in 2015 and will consider canceling it
 1568     permanently.  For now, assume no DST indefinitely.
 1569     (Thanks to Ahmed Nazmy and Tim Parenti.)
 1570 
 1571   Changes affecting past timestamps
 1572 
 1573     America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not
 1574     1966-07-01.  Also, Yukon's time zone history is documented better.
 1575     (Thanks to Brian Inglis and Dennis Ferguson.)
 1576 
 1577   Change affecting past and future time zone abbreviations
 1578 
 1579     The abbreviations for Hawaii-Aleutian standard and daylight times
 1580     have been changed from HAST/HADT to HST/HDT, as per US Government
 1581     Printing Office style.  This affects only America/Adak since 1983,
 1582     as America/Honolulu was already using the new style.
 1583 
 1584   Changes affecting code
 1585 
 1586    zic has some minor performance improvements.
 1587 
 1588 
 1589 Release 2015c - 2015-04-11 08:55:55 -0700
 1590 
 1591   Changes affecting future timestamps
 1592 
 1593     Egypt's spring-forward transition is at 24:00 on April's last Thursday,
 1594     not 00:00 on April's last Friday.  2015's transition will therefore be on
 1595     Thursday, April 30 at 24:00, not Friday, April 24 at 00:00.  Similar fixes
 1596     apply to 2026, 2037, 2043, etc.  (Thanks to Steffen Thorsen.)
 1597 
 1598   Changes affecting past timestamps
 1599 
 1600     The following changes affect some pre-1991 Chile-related timestamps
 1601     in America/Santiago, Antarctica/Palmer, and Pacific/Easter.
 1602 
 1603       The 1910 transition was January 10, not January 1.
 1604 
 1605       The 1918 transition was September 10, not September 1.
 1606 
 1607       The UT -04 time observed from 1932 to 1942 is now considered to
 1608       be standard time, not year-round DST.
 1609 
 1610       Santiago observed DST (UT -03) from 1946-07-15 through
 1611       1946-08-31, then reverted to standard time, then switched to -05
 1612       on 1947-04-01.
 1613 
 1614       Assume transitions before 1968 were at 00:00, since we have no data
 1615       saying otherwise.
 1616 
 1617       The spring 1988 transition was 1988-10-09, not 1988-10-02.
 1618       The fall 1990 transition was 1990-03-11, not 1990-03-18.
 1619 
 1620       Assume no UT offset change for Pacific/Easter on 1890-01-01,
 1621       and omit all transitions on Pacific/Easter from 1942 through 1946
 1622       since we have no data suggesting that they existed.
 1623 
 1624     One more zone has been turned into a link, as it differed
 1625     from an existing zone only for older timestamps.  As usual,
 1626     this change affects UT offsets in pre-1970 timestamps only.
 1627     The zone's old contents have been moved to the 'backzone' file.
 1628     The affected zone is America/Montreal.
 1629 
 1630   Changes affecting commentary
 1631 
 1632     Mention the TZUpdater tool.
 1633 
 1634     Mention "The Time Now".  (Thanks to Brandon Ramsey.)
 1635 
 1636 
 1637 Release 2015b - 2015-03-19 23:28:11 -0700
 1638 
 1639   Changes affecting future timestamps
 1640 
 1641     Mongolia will start observing DST again this year, from the last
 1642     Saturday in March at 02:00 to the last Saturday in September at 00:00.
 1643     (Thanks to Ganbold Tsagaankhuu.)
 1644 
 1645     Palestine will start DST on March 28, not March 27.  Also,
 1646     correct the fall 2014 transition from September 26 to October 24.
 1647     Adjust future predictions accordingly.  (Thanks to Steffen Thorsen.)
 1648 
 1649   Changes affecting past timestamps
 1650 
 1651     The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a
 1652     regression.  (Thanks to Stuart Bishop for reporting the problem.)
 1653 
 1654     Some more zones have been turned into links, when they differed
 1655     from existing zones only for older timestamps.  As usual,
 1656     these changes affect UT offsets in pre-1970 timestamps only.
 1657     Their old contents have been moved to the 'backzone' file.
 1658     The affected zones are: America/Antigua, America/Cayman,
 1659     Pacific/Midway, and Pacific/Saipan.
 1660 
 1661   Changes affecting time zone abbreviations
 1662 
 1663     Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD".
 1664     (Thanks to Hank W.)
 1665 
 1666   Changes affecting code
 1667 
 1668     Fix integer overflow bug in reference 'mktime' implementation.
 1669     (Problem reported by Jörg Richter.)
 1670 
 1671     Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries
 1672     to be used in the same executable as standard-library time_t functions.
 1673     (Problems reported by Bradley White.)
 1674 
 1675   Changes affecting commentary
 1676 
 1677     Cite the recent Mexican decree changing Quintana Roo's time zone.
 1678     (Thanks to Carlos Raúl Perasso.)
 1679 
 1680     Likewise for the recent Chilean decree.  (Thanks to Eduardo Romero Urra.)
 1681 
 1682     Update info about Mars time.
 1683 
 1684 
 1685 Release 2015a - 2015-01-29 22:35:20 -0800
 1686 
 1687   Changes affecting future timestamps
 1688 
 1689     The Mexican state of Quintana Roo, represented by America/Cancun,
 1690     will shift from Central Time with DST to Eastern Time without DST
 1691     on 2015-02-01 at 02:00.  (Thanks to Steffen Thorsen and Gwillim Law.)
 1692 
 1693     Chile will not change clocks in April or thereafter; its new standard time
 1694     will be its old daylight saving time.  This affects America/Santiago,
 1695     Pacific/Easter, and Antarctica/Palmer.  (Thanks to Juan Correa.)
 1696 
 1697     New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
 1698     (Thanks to Tim Parenti.)
 1699 
 1700   Changes affecting past timestamps
 1701 
 1702     Iceland observed DST in 1919 and 1921, and its 1939 fallback
 1703     transition was Oct. 29, not Nov. 29.  Remove incorrect data from
 1704     Shanks about time in Iceland between 1837 and 1908.
 1705 
 1706     Some more zones have been turned into links, when they differed
 1707     from existing zones only for older timestamps.  As usual,
 1708     these changes affect UT offsets in pre-1970 timestamps only.
 1709     Their old contents have been moved to the 'backzone' file.
 1710     The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
 1711     and Asia/Muscat.
 1712 
 1713   Changes affecting code
 1714 
 1715     tzalloc now scrubs time zone abbreviations compatibly with the way
 1716     that tzset always has, by replacing invalid bytes with '_' and by
 1717     shortening too-long abbreviations.
 1718 
 1719     tzselect ports to POSIX awk implementations, no longer mishandles
 1720     POSIX TZ settings when GNU awk is used, and reports POSIX TZ
 1721     settings to the user.  (Thanks to Stefan Kuhn.)
 1722 
 1723   Changes affecting build procedure
 1724 
 1725     'make check' now checks for links to links in the data.
 1726     One such link (for Africa/Asmera) has been fixed.
 1727     (Thanks to Stephen Colebourne for pointing out the problem.)
 1728 
 1729   Changes affecting commentary
 1730 
 1731     The leapseconds file commentary now mentions the expiration date.
 1732     (Problem reported by Martin Burnicki.)
 1733 
 1734     Update Mexican Library of Congress URL.
 1735 
 1736 
 1737 Release 2014j - 2014-11-10 17:37:11 -0800
 1738 
 1739   Changes affecting current and future timestamps
 1740 
 1741     Turks & Caicos' switch from US eastern time to UT -04 year-round
 1742     did not occur on 2014-11-02 at 02:00.  It's currently scheduled
 1743     for 2015-11-01 at 02:00.  (Thanks to Chris Walton.)
 1744 
 1745   Changes affecting past timestamps
 1746 
 1747     Many pre-1989 timestamps have been corrected for Asia/Seoul and
 1748     Asia/Pyongyang, based on sources for the Korean-language Wikipedia
 1749     entry for time in Korea.  (Thanks to Sanghyuk Jung.)  Also, no
 1750     longer guess that Pyongyang mimicked Seoul time after World War II,
 1751     as this is politically implausible.
 1752 
 1753     Some more zones have been turned into links, when they differed
 1754     from existing zones only for older timestamps.  As usual,
 1755     these changes affect UT offsets in pre-1970 timestamps only.
 1756     Their old contents have been moved to the 'backzone' file.
 1757     The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
 1758     Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
 1759     Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and
 1760     Indian/Mayotte.
 1761 
 1762   Changes affecting commentary
 1763 
 1764     The commentary is less enthusiastic about Shanks as a source,
 1765     and is more careful to distinguish UT from UTC.
 1766 
 1767 
 1768 Release 2014i - 2014-10-21 22:04:57 -0700
 1769 
 1770   Changes affecting future timestamps
 1771 
 1772     Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
 1773     (Thanks to Ken Rylander for the heads-up.)  Guess that future
 1774     years will use a similar pattern.
 1775 
 1776     A new Zone Pacific/Bougainville, for the part of Papua New Guinea
 1777     that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00.
 1778     (Thanks to Kiley Walbom for the heads-up.)
 1779 
 1780   Changes affecting time zone abbreviations
 1781 
 1782     Since Belarus is not changing its clocks even though Moscow is,
 1783     the time zone abbreviation in Europe/Minsk is changing from FET
 1784     to its more-traditional value MSK on 2014-10-26 at 01:00.
 1785     (Thanks to Alexander Bokovoy for the heads-up about Belarus.)
 1786 
 1787     The new abbreviation IDT stands for the pre-1976 use of UT +08 in
 1788     Indochina, to distinguish it better from ICT (+07).
 1789 
 1790   Changes affecting past timestamps
 1791 
 1792     Many timestamps have been corrected for Asia/Ho_Chi_Minh before 1976
 1793     (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
 1794     authoritative book).  Asia/Ho_Chi_Minh has been added to
 1795     zone1970.tab, to give tzselect users in Vietnam two choices,
 1796     since north and south Vietnam disagreed after our 1970 cutoff.
 1797 
 1798     Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
 1799     they differed from existing zones only for older timestamps.  As
 1800     usual, these changes affect pre-1970 timestamps only.  Their old
 1801     contents have been moved to the 'backzone' file.
 1802 
 1803   Changes affecting code
 1804 
 1805     The time-related library functions now set errno on failure, and
 1806     some crashes in the new tzalloc-related library functions have
 1807     been fixed.  (Thanks to Christos Zoulas for reporting most of
 1808     these problems and for suggesting fixes.)
 1809 
 1810     If USG_COMPAT is defined and the requested timestamp is standard time,
 1811     the tz library's localtime and mktime functions now set the extern
 1812     variable timezone to a value appropriate for that timestamp; and
 1813     similarly for ALTZONE, daylight saving time, and the altzone variable.
 1814     This change is a companion to the tzname change in 2014h, and is
 1815     designed to make timezone and altzone more compatible with tzname.
 1816 
 1817     The tz library's functions now set errno to EOVERFLOW if they fail
 1818     because the result cannot be represented.  ctime and ctime_r now
 1819     return NULL and set errno when a timestamp is out of range, rather
 1820     than having undefined behavior.
 1821 
 1822     Some bugs associated with the new 2014g functions have been fixed.
 1823     This includes a bug that largely incapacitated the new functions
 1824     time2posix_z and posix2time_z.  (Thanks to Christos Zoulas.)
 1825     It also includes some uses of uninitialized variables after tzalloc.
 1826     The new code uses the standard type 'ssize_t', which the Makefile
 1827     now gives porting advice about.
 1828 
 1829   Changes affecting commentary
 1830 
 1831     Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis).
 1832 
 1833 
 1834 Release 2014h - 2014-09-25 18:59:03 -0700
 1835 
 1836   Changes affecting past timestamps
 1837 
 1838     America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.
 1839 
 1840     Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01,
 1841     not 1920-01-06.  The old entry was based on a misinterpretation of Shanks.
 1842 
 1843     Some more zones have been turned into links, when they differed
 1844     from existing zones only for older timestamps.  As usual,
 1845     these changes affect UT offsets in pre-1970 timestamps only.
 1846     Their old contents have been moved to the 'backzone' file.
 1847     The affected zones are: Africa/Blantyre, Africa/Bujumbura,
 1848     Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
 1849     Africa/Lusaka, Africa/Maseru, and Africa/Mbabane.
 1850 
 1851   Changes affecting code
 1852 
 1853     zdump -V and -v now output gmtoff= values on all platforms,
 1854     not merely on platforms defining TM_GMTOFF.
 1855 
 1856     The tz library's localtime and mktime functions now set tzname to a value
 1857     appropriate for the requested timestamp, and zdump now uses this
 1858     on platforms not defining TM_ZONE, fixing a 2014g regression.
 1859     (Thanks to Tim Parenti for reporting the problem.)
 1860 
 1861     The tz library no longer sets tzname if localtime or mktime fails.
 1862 
 1863     zdump -c no longer mishandles transitions near year boundaries.
 1864     (Thanks to Tim Parenti for reporting the problem.)
 1865 
 1866     An access to uninitialized data has been fixed.
 1867     (Thanks to Jörg Richter for reporting the problem.)
 1868 
 1869     When THREAD_SAFE is defined, the code ports to the C11 memory model.
 1870     A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined
 1871     and two threads race to initialize data used by gmtime-like functions.
 1872     (Thanks to Andy Heninger for reporting the problems.)
 1873 
 1874   Changes affecting build procedure
 1875 
 1876     'make check' now checks better for properly-sorted data.
 1877 
 1878   Changes affecting documentation and commentary
 1879 
 1880     zdump's gmtoff=N output is now documented, and its isdst=D output
 1881     is now documented to possibly output D values other than 0 or 1.
 1882 
 1883     zdump -c's treatment of years is now documented to use the
 1884     Gregorian calendar and Universal Time without leap seconds,
 1885     and its behavior at cutoff boundaries is now documented better.
 1886     (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.)
 1887 
 1888     Programs are now documented to use the proleptic Gregorian calendar.
 1889     (Thanks to Alan Barrett for the suggestion.)
 1890 
 1891     Fractional-second GMT offsets have been documented for civil time
 1892     in 19th-century Chennai, Jakarta, and New York.
 1893 
 1894 
 1895 Release 2014g - 2014-08-28 12:31:23 -0700
 1896 
 1897   Changes affecting future timestamps
 1898 
 1899     Turks & Caicos is switching from US eastern time to UT -04
 1900     year-round, modeled as a switch on 2014-11-02 at 02:00.
 1901     [As noted in 2014j, this switch was later delayed.]
 1902 
 1903   Changes affecting past timestamps
 1904 
 1905     Time in Russia or the USSR before 1926 or so has been corrected by
 1906     a few seconds in the following zones: Asia/Irkutsk,
 1907     Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi,
 1908     Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara.  For
 1909     Asia/Yekaterinburg the correction is a few minutes.  (Thanks to
 1910     Vladimir Karpinsky.)
 1911 
 1912     The Portuguese decree of 1911-05-26 took effect on 1912-01-01.
 1913     This affects 1911 timestamps in Africa/Bissau, Africa/Luanda,
 1914     Atlantic/Azores, and Atlantic/Madeira.  Also, Lisbon's pre-1912
 1915     GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32.
 1916     (Thanks to Stephen Colebourne for pointing to the decree.)
 1917 
 1918     Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59.
 1919 
 1920     A new file 'backzone' contains data which may appeal to
 1921     connoisseurs of old timestamps, although it is out of scope for
 1922     the tz database, is often poorly sourced, and contains some data
 1923     that is known to be incorrect.  The new file is not recommended
 1924     for ordinary use and its entries are not installed by default.
 1925     (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and
 1926     Isle of Man entries.)
 1927 
 1928     Some more zones have been turned into links, when they differed
 1929     from existing zones only for older timestamps.  As usual,
 1930     these changes affect UT offsets in pre-1970 timestamps only.
 1931     Their old contents have been moved to the 'backzone' file.
 1932     The affected zones are: Africa/Bangui, Africa/Brazzaville,
 1933     Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
 1934     Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
 1935 
 1936   Changes affecting code
 1937 
 1938     Unless NETBSD_INSPIRED is defined to 0, the tz library now
 1939     supplies functions for creating and using objects that represent
 1940     timezones. The new functions are tzalloc, tzfree, localtime_rz,
 1941     mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
 1942     time2posix_z.  They are intended for performance: for example,
 1943     localtime_rz (unlike localtime_r) is trivially thread-safe without
 1944     locking.  (Thanks to Christos Zoulas for proposing NetBSD-inspired
 1945     functions, and to Alan Barrett and Jonathan Lennox for helping to
 1946     debug the change.)
 1947 
 1948     zdump now builds with the tz library unless USE_LTZ is defined to 0,
 1949     This lets zdump use tz features even if the system library lacks them.
 1950     To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0
 1951     TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
 1952 
 1953     zdump now uses localtime_rz if available, as it's significantly faster,
 1954     and it can help zdump better diagnose invalid timezone names.
 1955     Define HAVE_LOCALTIME_RZ to 0 to suppress this.  HAVE_LOCALTIME_RZ
 1956     defaults to 1 if NETBSD_INSPIRED && USE_LTZ.  When localtime_rz is
 1957     not available, zdump now uses localtime_r and tzset if available,
 1958     as this is a bit cleaner and faster than plain localtime.  Compile
 1959     with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
 1960     lacks these two functions.
 1961 
 1962     If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
 1963     Although not needed for tz's own applications, which are single-threaded,
 1964     this supports POSIX better if the tz library is used in multithreaded apps.
 1965 
 1966     Some crashes have been fixed when zdump or the tz library is given
 1967     invalid or outlandish input.
 1968 
 1969     The tz library no longer mishandles leap seconds on platforms with
 1970     unsigned time_t in timezones that lack ordinary transitions after 1970.
 1971 
 1972     The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
 1973     already defined, to make it easier to configure on common platforms.
 1974     Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
 1975 
 1976     Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
 1977     assumes that reading uninitialized memory yields garbage values
 1978     but does not cause other problems such as traps.
 1979 
 1980     If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now
 1981     more likely to guess right for ambiguous timestamps near
 1982     transitions where tm_isdst does not change.
 1983 
 1984     If HAVE_STRFTIME_L is defined to 1, the tz library now defines
 1985     strftime_l for compatibility with recent versions of POSIX.
 1986     Only the C locale is supported, though.  HAVE_STRFTIME_L defaults
 1987     to 1 on recent POSIX versions, and to 0 otherwise.
 1988 
 1989     tzselect -c now uses a hybrid distance measure that works better
 1990     in Africa.  (Thanks to Alan Barrett for noting the problem.)
 1991 
 1992     The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used,
 1993     or when time_tz is defined.
 1994 
 1995     When HAVE_UTMPX_H is set the 'date' command now builds on systems
 1996     whose <utmpx.h> file does not define WTMPX_FILE, and when setting
 1997     the date it updates the wtmpx file if _PATH_WTMPX is defined.
 1998     This affects GNU/Linux and similar systems.
 1999 
 2000     For easier maintenance later, some C code has been simplified,
 2001     some lint has been removed, and the code has been tweaked so that
 2002     plain 'make' is more likely to work.
 2003 
 2004     The C type 'bool' is now used for boolean values, instead of 'int'.
 2005 
 2006     The long-obsolete LOCALE_HOME code has been removed.
 2007 
 2008     The long-obsolete 'gtime' function has been removed.
 2009 
 2010   Changes affecting build procedure
 2011 
 2012     'zdump' no longer links in ialloc.o, as it's not needed.
 2013 
 2014     'make check_time_t_alternatives' no longer assumes GNU diff.
 2015 
 2016   Changes affecting distribution tarballs
 2017 
 2018     The files checktab.awk and zoneinfo2tdf.pl are now distributed in
 2019     the tzdata tarball instead of the tzcode tarball, since they help
 2020     maintain the data.  The NEWS and Theory files are now also
 2021     distributed in the tzdata tarball, as they're relevant for data.
 2022     (Thanks to Alan Barrett for pointing this out.)  Also, the
 2023     leapseconds.awk file is no longer distributed in the tzcode
 2024     tarball, since it belongs in the tzdata tarball (where 2014f
 2025     inadvertently also distributed it).
 2026 
 2027   Changes affecting documentation and commentary
 2028 
 2029     A new file CONTRIBUTING is distributed.  (Thanks to Tim Parenti for
 2030     suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms
 2031     for debugging it.)
 2032 
 2033     The man pages have been updated to use function prototypes,
 2034     to document thread-safe variants like localtime_r, and to document
 2035     the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and
 2036     mktime_z.
 2037 
 2038     The fields in Link lines have been renamed to be more descriptive
 2039     and more like the parameters of 'ln'.  LINK-FROM has become TARGET,
 2040     and LINK-TO has become LINK-NAME.
 2041 
 2042     tz-link.htm mentions the IETF's tzdist working group; Windows
 2043     Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
 2044 
 2045     Some broken URLs have been fixed in the commentary.  (Thanks to
 2046     Lester Caine.)
 2047 
 2048     Commentary about Philippines DST has been updated, and commentary
 2049     on pre-1970 time in India has been added.
 2050 
 2051 
 2052 Release 2014f - 2014-08-05 17:42:36 -0700
 2053 
 2054   Changes affecting future timestamps
 2055 
 2056     Russia will subtract an hour from most of its time zones on 2014-10-26
 2057     at 02:00 local time.  (Thanks to Alexander Krivenyshev.)
 2058     There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky
 2059     Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug
 2060     (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast
 2061     (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic
 2062     (Europe/Samara) are not changing their clocks.  The changed zones are
 2063     Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd,
 2064     Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk,
 2065     Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga,
 2066     Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours
 2067     subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected,
 2068     but not its UTC offset.  Two zones are added: Asia/Chita (split
 2069     from Asia/Yakutsk, and also with two hours subtracted) and
 2070     Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour
 2071     subtracted).  (Thanks to Tim Parenti for much of the above.)
 2072 
 2073   Changes affecting time zone abbreviations
 2074 
 2075     Australian eastern time zone abbreviations are now AEST/AEDT not EST,
 2076     and similarly for the other Australian zones.  That is, for eastern
 2077     standard and daylight saving time the abbreviations are AEST and AEDT
 2078     instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
 2079     and AWST/AWDT are now used instead of the former CST, CWST, and WST.
 2080     This change does not affect UT offsets, only time zone abbreviations.
 2081     (Thanks to Rich Tibbett and many others.)
 2082 
 2083     Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07)
 2084     effective 2014-10-26 at 02:00 local time.
 2085 
 2086     The time zone abbreviation for Xinjiang Time (observed in Ürümqi)
 2087     has been changed from URUT to XJT.  (Thanks to Luther Ma.)
 2088 
 2089     Prefer MSK/MSD for Moscow time in Russia, even in other cities.
 2090     Similarly, prefer EET/EEST for eastern European time in Russia.
 2091 
 2092     Change time zone abbreviations in (western) Samoa to use "ST" and
 2093     "DT" suffixes, as this is more likely to match common practice.
 2094     Prefix "W" to (western) Samoa time when its standard-time offset
 2095     disagrees with that of American Samoa.
 2096 
 2097     America/Metlakatla now uses PST, not MeST, to abbreviate its time zone.
 2098 
 2099     Time zone abbreviations have been updated for Japan's two time
 2100     zones used 1896-1937.  JWST now stands for Western Standard
 2101     Time, and JCST for Central Standard Time (formerly this was CJT).
 2102     These abbreviations are now used for time in Korea, Taiwan,
 2103     and Sakhalin while controlled by Japan.
 2104 
 2105   Changes affecting past timestamps
 2106 
 2107     China's five zones have been simplified to two, since the post-1970
 2108     differences in the other three seem to have been imaginary.  The
 2109     zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been
 2110     removed; backwards-compatibility links still work, albeit with
 2111     different behaviors for timestamps before May 1980.  Asia/Urumqi's
 2112     1980 transition to UT +08 has been removed, so that it is now at
 2113     +06 and not +08.  (Thanks to Luther Ma and to Alois Treindl;
 2114     Treindl sent helpful translations of two papers by Guo Qingsheng.)
 2115 
 2116     Some zones have been turned into links, when they differed from existing
 2117     zones only for older UT offsets where data entries were likely invented.
 2118     These changes affect UT offsets in pre-1970 timestamps only.  This is
 2119     similar to the change in release 2013e, except this time for western
 2120     Africa.  The affected zones are: Africa/Bamako, Africa/Banjul,
 2121     Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,
 2122     Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and
 2123     Atlantic/St_Helena.  This also affects the backwards-compatibility
 2124     link Africa/Timbuktu.  (Thanks to Alan Barrett, Stephen Colebourne,
 2125     Tim Parenti, and David Patte for reporting problems in earlier
 2126     versions of this change.)
 2127 
 2128     Asia/Shanghai's pre-standard-time UT offset has been changed from
 2129     8:05:57 to 8:05:43, the location of Xujiahui Observatory.  Its
 2130     transition to standard time has been changed from 1928 to 1901.
 2131 
 2132     Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01,
 2133     then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945.
 2134     In 1946 it observed DST from 05-15 through 09-30; in 1947
 2135     from 04-15 through 10-31; and in 1979 from 07-01 through 09-30.
 2136     (Thanks to Yu-Cheng Chuang.)
 2137 
 2138     Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950.
 2139 
 2140     Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not
 2141     10-03 at 00:00.  (Thanks to Konstantin Hyppönen.)
 2142 
 2143     Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the
 2144     period from 1911 to 1950.
 2145 
 2146     Pacific/Chatham has been changed to New Zealand standard time plus
 2147     45 minutes for the period before 1957, reflecting a 1956 remark in
 2148     the New Zealand parliament.
 2149 
 2150     Europe/Budapest has several pre-1946 corrections: in 1918 the transition
 2151     out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in
 2152     1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08
 2153     not 04-06 at 02:00; and there was no DST in 1920.
 2154 
 2155     Africa/Accra is now assumed to have observed DST from 1920 through 1935.
 2156 
 2157     Time in Russia before 1927 or so has been corrected by a few seconds in
 2158     the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi,
 2159     Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and
 2160     Europe/Riga.  Also, Moscow's location has been changed to its Kilometer 0
 2161     point.  (Thanks to Vladimir Karpinsky for the Moscow changes.)
 2162 
 2163   Changes affecting data format
 2164 
 2165     A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data.
 2166     The new file's extended format allows multiple country codes per zone.
 2167     The older file is still installed but is deprecated; its format is
 2168     not changing and it will still be distributed for a while, but new
 2169     applications should use the new file.
 2170 
 2171     The new file format simplifies maintenance of obscure locations.
 2172     To test this, it adds coverage for the Crozet Islands and the
 2173     Scattered Islands.  (Thanks to Tobias Conradi and Antoine Leca.)
 2174 
 2175     The file 'iso3166.tab' is planned to switch from ASCII to UTF-8.
 2176     It is still ASCII now, but commentary about the switch has been added.
 2177     The new file 'zone1970.tab' already uses UTF-8.
 2178 
 2179   Changes affecting code
 2180 
 2181     'localtime', 'mktime', etc. now use much less stack space if ALL_STATE
 2182     is defined.  (Thanks to Elliott Hughes for reporting the problem.)
 2183 
 2184     'zic' no longer mishandles input when ignoring case in locales that
 2185     are not compatible with English, e.g., unibyte Turkish locales when
 2186     compiled with HAVE_GETTEXT.
 2187 
 2188     Error diagnostics of 'zic' and 'yearistype' have been reworded so that
 2189     they no longer use ASCII '-' as if it were a dash.
 2190 
 2191     'zic' now rejects output file names that contain '.' or '..' components.
 2192     (Thanks to Tim Parenti for reporting the problem.)
 2193 
 2194     'zic -v' now warns about output file names that do not follow
 2195     POSIX rules, or that contain a digit or '.'.  (Thanks to Arthur
 2196     David Olson for starting the ball rolling on this.)
 2197 
 2198     Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0.
 2199 
 2200   Changes affecting build procedure
 2201 
 2202     'zic' no longer links in localtime.o and asctime.o, as they're not needed.
 2203     (Thanks to John Cochran.)
 2204 
 2205   Changes affecting documentation and commentary
 2206 
 2207     The 'Theory' file documents legacy names, the longstanding
 2208     exceptions to the POSIX-inspired file name rules.
 2209 
 2210     The 'zic' documentation clarifies the role of time types when
 2211     interpreting dates.  (Thanks to Arthur David Olson.)
 2212 
 2213     Documentation and commentary now prefer UTF-8 to US-ASCII,
 2214     allowing the use of proper accents in foreign words and names.
 2215     Code and data have not changed because of this.  (Thanks to
 2216     Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug
 2217     this.)
 2218 
 2219     Non-HTML documentation and commentary now use plain-text URLs instead of
 2220     HTML insertions, and are more consistent about bracketing URLs when they
 2221     are not already surrounded by white space.  (Thanks to suggestions by
 2222     Steffen Nurpmeso.)
 2223 
 2224     There is new commentary about Xujiahui Observatory, the five time-zone
 2225     project in China from 1918 to 1949, timekeeping in Japanese-occupied
 2226     Shanghai, and Tibet Time in the 1950s.  The sharp-eyed can spot the
 2227     warlord Jin Shuren in the data.
 2228 
 2229     Commentary about the coverage of each Russian zone has been standardized.
 2230     (Thanks to Tim Parenti).
 2231 
 2232     There is new commentary about contemporary timekeeping in Ethiopia.
 2233 
 2234     Obsolete comments about a 2007 proposal for DST in Kuwait has been removed.
 2235 
 2236     There is new commentary about time in Poland in 1919.
 2237 
 2238     Proper credit has been given to DST inventor George Vernon Hudson.
 2239 
 2240     Commentary about time in Metlakatla, AK and Resolute, NU has been
 2241     improved, with a new source for the former.
 2242 
 2243     In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it
 2244     is uninhabited.
 2245 
 2246     Commentary about permanent Antarctic bases has been updated.
 2247 
 2248     Several typos have been corrected.  (Thanks to Tim Parenti for
 2249     contributing some of these fixes.)
 2250 
 2251     tz-link.htm now mentions the JavaScript libraries Moment Timezone,
 2252     TimezoneJS.Date, Walltime-js, and Timezone.  (Thanks to a heads-up
 2253     from Matt Johnson.)  Also, it mentions the Go 'latlong' package.
 2254     (Thanks to a heads-up from Dirkjan Ochtman.)
 2255 
 2256     The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998
 2257     have been removed.  These obsolescent US Naval Observatory entries were no
 2258     longer helpful for maintenance.  (Thanks to Tim Parenti for the suggestion.)
 2259 
 2260 
 2261 Release 2014e - 2014-06-12 21:53:52 -0700
 2262 
 2263   Changes affecting near-future timestamps
 2264 
 2265     Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00.
 2266     (Thanks to Imed Chihi.)  Guess that from 2015 on Egypt will temporarily
 2267     switch to standard time at 24:00 the last Thursday before Ramadan, and
 2268     back to DST at 00:00 the first Friday after Ramadan.
 2269 
 2270     Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00.  (Thanks
 2271     to Milamber Space Network.)  Guess that from 2015 on Morocco will
 2272     temporarily switch to standard time at 03:00 the last Saturday before
 2273     Ramadan, and back to DST at 02:00 the first Saturday after Ramadan.
 2274 
 2275   Changes affecting past timestamps
 2276 
 2277     The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of
 2278     "MSD" for Moscow's double daylight time in summer 1921.  Also, a typo
 2279     "VLASST" has been repaired to be "VLAST" for Vladivostok summer time
 2280     in 1991.  (Thanks to Hank W. for reporting the problems.)
 2281 
 2282   Changes affecting commentary
 2283 
 2284     tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the
 2285     draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and
 2286     removes stale pointers to World Time Explorer and WORLDTIME.
 2287 
 2288 
 2289 Release 2014d - 2014-05-27 21:34:40 -0700
 2290 
 2291   Changes affecting code
 2292 
 2293     zic no longer generates files containing timestamps before the Big Bang.
 2294     This works around GNOME glib bug 878
 2295     <https://gitlab.gnome.org/GNOME/glib/issues/878>
 2296     (Thanks to Leonardo Chiquitto for reporting the bug, and to
 2297     Arthur David Olson and James Cloos for suggesting improvements to the fix.)
 2298 
 2299   Changes affecting documentation
 2300 
 2301     tz-link.htm now mentions GNOME.
 2302 
 2303 
 2304 Release 2014c - 2014-05-13 07:44:13 -0700
 2305 
 2306   Changes affecting near-future timestamps
 2307 
 2308     Egypt observes DST starting 2014-05-15 at 24:00.
 2309     (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
 2310     Details have not been announced, except that DST will not be observed
 2311     during Ramadan.  Guess that DST will stop during the same Ramadan dates as
 2312     Morocco, and that Egypt's future spring and fall transitions will be the
 2313     same as 2010 when it last observed DST, namely April's last Friday at
 2314     00:00 to September's last Thursday at 23:00 standard time.  Also, guess
 2315     that Ramadan transitions will be at 00:00 standard time.
 2316 
 2317   Changes affecting code
 2318 
 2319     zic now generates transitions for minimum time values, eliminating guesswork
 2320     when handling low-valued timestamps.  (Thanks to Arthur David Olson.)
 2321 
 2322     Port to Cygwin sans glibc.  (Thanks to Arthur David Olson.)
 2323 
 2324   Changes affecting commentary and documentation
 2325 
 2326     Remove now-confusing comment about Jordan.  (Thanks to Oleksii Nochovnyi.)
 2327 
 2328 
 2329 Release 2014b - 2014-03-24 21:28:50 -0700
 2330 
 2331   Changes affecting near-future timestamps
 2332 
 2333     Crimea switches to Moscow time on 2014-03-30 at 02:00 local time.
 2334     (Thanks to Alexander Krivenyshev.)  Move its zone.tab entry from UA to RU.
 2335 
 2336     New entry for Troll station, Antarctica.  (Thanks to Paul-Inge Flakstad and
 2337     Bengt-Inge Larsson.)  This is currently an approximation; a better version
 2338     will require the zic and localtime fixes mentioned below, and the plan is
 2339     to wait for a while until at least the zic fixes propagate.
 2340 
 2341   Changes affecting code
 2342 
 2343     'zic' and 'localtime' no longer reject locations needing four transitions
 2344     per year for the foreseeable future.  (Thanks to Andrew Main (Zefram).)
 2345     Also, 'zic' avoids some unlikely failures due to integer overflow.
 2346 
 2347   Changes affecting build procedure
 2348 
 2349     'make check' now detects Rule lines defined but never used.
 2350     The NZAQ rules, an instance of this problem, have been removed.
 2351 
 2352   Changes affecting commentary and documentation
 2353 
 2354     Fix Tuesday/Thursday typo in description of time in Israel.
 2355     (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.)
 2356 
 2357     Microsoft Windows 8.1 doesn't support tz database names.  (Thanks
 2358     to Donald MacQueen.)  Instead, the Microsoft Windows Store app
 2359     library supports them.
 2360 
 2361     Add comments about Johnston Island time in the 1960s.
 2362     (Thanks to Lyle McElhaney.)
 2363 
 2364     Morocco's 2014 DST start will be as predicted.
 2365     (Thanks to Sebastien Willemijns.)
 2366 
 2367 
 2368 Release 2014a - 2014-03-07 23:30:29 -0800
 2369 
 2370   Changes affecting near-future timestamps
 2371 
 2372     Turkey begins DST on 2014-03-31, not 03-30.  (Thanks to Faruk Pasin for
 2373     the heads-up, and to Tim Parenti for simplifying the update.)
 2374 
 2375   Changes affecting past timestamps
 2376 
 2377     Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00.
 2378     (Thanks to Steffen Thorsen.)
 2379 
 2380     Ukraine switched from Moscow to Eastern European time on 1990-07-01
 2381     (not 1992-01-01), and observed DST during the entire next winter.
 2382     (Thanks to Vladimir in Moscow via Alois Treindl.)
 2383 
 2384     In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03.
 2385     (Thanks to Avigdor Finkelstein.)
 2386 
 2387   Changes affecting code
 2388 
 2389     A uninitialized-storage bug in 'localtime' has been fixed.
 2390     (Thanks to Logan Chien.)
 2391 
 2392   Changes affecting the build procedure
 2393 
 2394     The settings for 'make check_web' now default to Ubuntu 13.10.
 2395 
 2396   Changes affecting commentary and documentation
 2397 
 2398     The boundary of the US Pacific time zone is given more accurately.
 2399     (Thanks to Alan Mintz.)
 2400 
 2401     Chile's 2014 DST will be as predicted.  (Thanks to José Miguel Garrido.)
 2402 
 2403     Paraguay's 2014 DST will be as predicted.  (Thanks to Carlos Raúl Perasso.)
 2404 
 2405     Better descriptions of countries with same time zone history as
 2406     Trinidad and Tobago since 1970.  (Thanks to Alan Barrett for suggestion.)
 2407 
 2408     Several changes affect tz-link.htm, the main web page.
 2409 
 2410       Mention Time.is (thanks to Even Scharning) and WX-now (thanks to
 2411       David Braverman).
 2412 
 2413       Mention xCal (Internet RFC 6321) and jCal.
 2414 
 2415       Microsoft has some support for tz database names.
 2416 
 2417       CLDR data formats include both XML and JSON.
 2418 
 2419       Mention Maggiolo's map of solar vs standard time.
 2420       (Thanks to Arthur David Olson.)
 2421 
 2422       Mention TZ4Net.  (Thanks to Matt Johnson.)
 2423 
 2424       Mention the timezone-olson Haskell package.
 2425 
 2426       Mention zeitverschiebung.net.  (Thanks to Martin Jäger.)
 2427 
 2428       Remove moribund links to daylight-savings-time.info and to
 2429       Simple Timer + Clocks.
 2430 
 2431       Update two links.  (Thanks to Oscar van Vlijmen.)
 2432 
 2433       Fix some formatting glitches, e.g., remove random newlines from
 2434       abbr elements' title attributes.
 2435 
 2436 
 2437 Release 2013i - 2013-12-17 07:25:23 -0800
 2438 
 2439   Changes affecting near-future timestamps:
 2440 
 2441     Jordan switches back to standard time at 00:00 on December 20, 2013.
 2442     The 2006-2011 transition schedule is planned to resume in 2014.
 2443     (Thanks to Steffen Thorsen.)
 2444 
 2445   Changes affecting past timestamps:
 2446 
 2447     In 2004, Cuba began DST on March 28, not April 4.
 2448     (Thanks to Steffen Thorsen.)
 2449 
 2450   Changes affecting code
 2451 
 2452     The compile-time flag NOSOLAR has been removed, as nowadays the
 2453     benefit of slightly shrinking runtime table size is outweighed by the
 2454     cost of disallowing potential future updates that exceed old limits.
 2455 
 2456   Changes affecting documentation and commentary
 2457 
 2458     The files solar87, solar88, and solar89 are no longer distributed.
 2459     They were a negative experiment - that is, a demonstration that
 2460     tz data can represent solar time only with some difficulty and error.
 2461     Their presence in the distribution caused confusion, as Riyadh
 2462     civil time was generally not solar time in those years.
 2463 
 2464     tz-link.htm now mentions Noda Time.  (Thanks to Matt Johnson.)
 2465 
 2466 
 2467 Release 2013h - 2013-10-25 15:32:32 -0700
 2468 
 2469   Changes affecting current and future timestamps:
 2470 
 2471     Libya has switched its UT offset back to +02 without DST, instead
 2472     of +01 with DST.  (Thanks to Even Scharning.)
 2473 
 2474     Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules.
 2475     (Thanks to Gwillim Law.)
 2476 
 2477   Changes affecting future timestamps:
 2478 
 2479     Acre and (we guess) western Amazonas will switch from UT -04 to -05
 2480     on 2013-11-10.  This affects America/Rio_Branco and America/Eirunepe.
 2481     (Thanks to Steffen Thorsen.)
 2482 
 2483     Add entries for DST transitions in Morocco in the year 2038.
 2484     This avoids some year-2038 glitches introduced in 2013g.
 2485     (Thanks to Yoshito Umaoka for reporting the problem.)
 2486 
 2487   Changes affecting API
 2488 
 2489     The 'tzselect' command no longer requires the 'select' command,
 2490     and should now work with /bin/sh on more platforms.  It also works
 2491     around a bug in BusyBox awk before version 1.21.0.  (Thanks to
 2492     Patrick 'P. J.' McDermott and Alan Barrett.)
 2493 
 2494   Changes affecting code
 2495 
 2496     Fix localtime overflow bugs with 32-bit unsigned time_t.
 2497 
 2498     zdump no longer assumes sscanf returns maximal values on overflow.
 2499 
 2500   Changes affecting the build procedure
 2501 
 2502     The builder can specify which programs to use, if any, instead of
 2503     'ar' and 'ranlib', and libtz.a is now built locally before being
 2504     installed.  (Thanks to Michael Forney.)
 2505 
 2506     A dependency typo in the 'zdump' rule has been fixed.
 2507     (Thanks to Andrew Paprocki.)
 2508 
 2509     The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f'
 2510     work as specified by POSIX.2-1992 or later; this is portable nowadays.
 2511 
 2512     'make clean' no longer removes 'leapseconds', since it's
 2513     host-independent and is part of the distribution.
 2514 
 2515     The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed.
 2516 
 2517   Changes affecting documentation and commentary
 2518 
 2519     tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol
 2520     (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle).
 2521 
 2522     Update URLs in tz-link page.  Add URLs for Microsoft Windows, since
 2523     8.1 introduces tz support.  Remove URLs for Tru64 and UnixWare (no
 2524     longer maintained) and for old advisories.  SOFA now does C.
 2525 
 2526 Release 2013g - 2013-09-30 21:08:26 -0700
 2527 
 2528   Changes affecting current and near-future timestamps
 2529 
 2530     Morocco now observes DST from the last Sunday in March to the last
 2531     Sunday in October, not April to September respectively.  (Thanks
 2532     to Steffen Thorsen.)
 2533 
 2534   Changes affecting 'zic'
 2535 
 2536     'zic' now runs on platforms that lack both hard links and symlinks.
 2537     (Thanks to Theo Veenker for reporting the problem, for MinGW.)
 2538     Also, fix some bugs on platforms that lack hard links but have symlinks.
 2539 
 2540     'zic -v' again warns that Asia/Tehran has no POSIX environment variable
 2541     to predict the far future, fixing a bug introduced in 2013e.
 2542 
 2543   Changes affecting the build procedure
 2544 
 2545     The 'leapseconds' file is again put into the tzdata tarball.
 2546     Also, 'leapseconds.awk', so tzdata is self-contained.  (Thanks to
 2547     Matt Burgess and Ian Abbott.)  The timestamps of these and other
 2548     dependent files in tarballs are adjusted more consistently.
 2549 
 2550   Changes affecting documentation and commentary
 2551 
 2552     The README file is now part of the data tarball as well as the code.
 2553     It now states that files are public domain unless otherwise specified.
 2554     (Thanks to Andrew Main (Zefram) for asking for clarifications.)
 2555     Its details about the 1989 release moved to a place of honor near
 2556     the end of NEWS.
 2557 
 2558 
 2559 Release 2013f - 2013-09-24 23:37:36 -0700
 2560 
 2561   Changes affecting near-future timestamps
 2562 
 2563     Tocantins will very likely not observe DST starting this spring.
 2564     (Thanks to Steffen Thorsen.)
 2565 
 2566     Jordan will likely stay at UT +03 indefinitely, and will not fall
 2567     back this fall.
 2568 
 2569     Palestine will fall back at 00:00, not 01:00.  (Thanks to Steffen Thorsen.)
 2570 
 2571   Changes affecting API
 2572 
 2573     The types of the global variables 'timezone' and 'altzone' (if present)
 2574     have been changed back to 'long'.  This is required for 'timezone'
 2575     by POSIX, and for 'altzone' by common practice, e.g., Solaris 11.
 2576     These variables were originally 'long' in the tz code, but were
 2577     mistakenly changed to 'time_t' in 1987; nobody reported the
 2578     incompatibility until now.  The difference matters on x32, where
 2579     'long' is 32 bits and 'time_t' is 64.  (Thanks to Elliott Hughes.)
 2580 
 2581   Changes affecting the build procedure
 2582 
 2583     Avoid long strings in leapseconds.awk to work around a mawk bug.
 2584     (Thanks to Cyril Baurand.)
 2585 
 2586   Changes affecting documentation and commentary
 2587 
 2588     New file 'NEWS' that contains release notes like this one.
 2589 
 2590     Paraguay's law does not specify DST transition time; 00:00 is customary.
 2591     (Thanks to Waldemar Villamayor-Venialbo.)
 2592 
 2593     Minor capitalization fixes.
 2594 
 2595   Changes affecting version-control only
 2596 
 2597     The experimental GitHub repository now contains annotated and
 2598     signed tags for recent releases, e.g., '2013e' for Release 2013e.
 2599     Releases are tagged starting with 2012e; earlier releases were
 2600     done differently, and tags would either not have a simple name or
 2601     not exactly match what was released.
 2602 
 2603     'make set-timestamps' is now simpler and a bit more portable.
 2604 
 2605 
 2606 Release 2013e - 2013-09-19 23:50:04 -0700
 2607 
 2608   Changes affecting near-future timestamps
 2609 
 2610     This year Fiji will start DST on October 27, not October 20.
 2611     (Thanks to David Wheeler for the heads-up.)  For now, guess that
 2612     Fiji will continue to spring forward the Sunday before the fourth
 2613     Monday in October.
 2614 
 2615   Changes affecting current and future time zone abbreviations
 2616 
 2617     Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian
 2618     time zone abbreviations since 1932.  (Thanks to George Ziegler,
 2619     Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and
 2620     Benny Lin.)  This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura,
 2621     Asia/Makassar, and Asia/Pontianak.
 2622 
 2623     Use ART (UT -03, standard time), rather than WARST (also -03, but
 2624     daylight saving time) for San Luis, Argentina since 2009.
 2625 
 2626   Changes affecting Godthåb timestamps after 2037 if version mismatch
 2627 
 2628     Allow POSIX-like TZ strings where the transition time's hour can
 2629     range from -167 through 167, instead of the POSIX-required 0
 2630     through 24.  E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the
 2631     new Fiji rules.  This is a more-compact way to represent
 2632     far-future timestamps for America/Godthab, America/Santiago,
 2633     Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem,
 2634     Pacific/Easter, and Pacific/Fiji.  Other zones are unaffected by
 2635     this change.  (Derived from a suggestion by Arthur David Olson.)
 2636 
 2637     Allow POSIX-like TZ strings where daylight saving time is in
 2638     effect all year.  E.g., TZ='WART4WARST,J1/0,J365/25' for Western
 2639     Argentina Summer Time all year.  This supports a more-compact way
 2640     to represent the 2013d data for America/Argentina/San_Luis.
 2641     Because of the change for San Luis noted above this change does not
 2642     affect the current data.  (Thanks to Andrew Main (Zefram) for
 2643     suggestions that improved this change.)
 2644 
 2645     Where these two TZ changes take effect, there is a minor extension
 2646     to the tz file format in that it allows new values for the
 2647     embedded TZ-format string, and the tz file format version number
 2648     has therefore been increased from 2 to 3 as a precaution.
 2649     Version-2-based client code should continue to work as before for
 2650     all timestamps before 2038.  Existing version-2-based client code
 2651     (tzcode, GNU/Linux, Solaris) has been tested on version-3-format
 2652     files, and typically works in practice even for timestamps after
 2653     2037; the only known exception is America/Godthab.
 2654 
 2655   Changes affecting timestamps before 1970
 2656 
 2657     Pacific/Johnston is now a link to Pacific/Honolulu.  This corrects
 2658     some errors before 1947.
 2659 
 2660     Some zones have been turned into links, when they differ from existing
 2661     zones only in older data entries that were likely invented or that
 2662     differ only in LMT or transitions from LMT.  These changes affect
 2663     only timestamps before 1943.  The affected zones are:
 2664     Africa/Juba, America/Anguilla, America/Aruba, America/Dominica,
 2665     America/Grenada, America/Guadeloupe, America/Marigot,
 2666     America/Montserrat, America/St_Barthelemy, America/St_Kitts,
 2667     America/St_Lucia, America/St_Thomas, America/St_Vincent,
 2668     America/Tortola, and Europe/Vaduz.  (Thanks to Alois Treindl for
 2669     confirming that the old Europe/Vaduz zone was wrong and the new
 2670     link is better for WWII-era times.)
 2671 
 2672     Change Kingston Mean Time from -5:07:12 to -5:07:11.  This affects
 2673     America/Cayman, America/Jamaica and America/Grand_Turk timestamps
 2674     from 1890 to 1912.
 2675 
 2676     Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46.
 2677     This affects Europe/Zurich timestamps from 1853 to 1894.  (Thanks
 2678     to Alois Treindl).
 2679 
 2680     Change the date of the circa-1850 Zurich transition from 1849-09-12
 2681     to 1853-07-16, overriding Shanks with data from Messerli about
 2682     postal and telegraph time in Switzerland.
 2683 
 2684   Changes affecting time zone abbreviations before 1970
 2685 
 2686     For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932,
 2687     as Jakarta was called Batavia back then.
 2688 
 2689   Changes affecting API
 2690 
 2691     The 'zic' command now outputs a dummy transition when far-future
 2692     data can't be summarized using a TZ string, and uses a 402-year
 2693     window rather than a 400-year window.  For the current data, this
 2694     affects only the Asia/Tehran file.  It does not affect any of the
 2695     timestamps that this file represents, so zdump outputs the same
 2696     information as before.  (Thanks to Andrew Main (Zefram).)
 2697 
 2698     The 'date' command has a new '-r' option, which lets you specify
 2699     the integer time to display, a la FreeBSD.
 2700 
 2701     The 'tzselect' command has two new options '-c' and '-n', which lets you
 2702     select a zone based on latitude and longitude.
 2703 
 2704     The 'zic' command's '-v' option now warns about constructs that
 2705     require the new version-3 binary file format.  (Thanks to Arthur
 2706     David Olson for the suggestion.)
 2707 
 2708     Support for floating-point time_t has been removed.
 2709     It was always dicey, and POSIX no longer requires it.
 2710     (Thanks to Eric Blake for suggesting to the POSIX committee to
 2711     remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy
 2712     Heninger, Arthur David Olson, and Alois Treindl, for reporting
 2713     bugs and elucidating some of the corners of the old floating-point
 2714     implementation.)
 2715 
 2716     The signatures of 'offtime', 'timeoff', and 'gtime' have been
 2717     changed back to the old practice of using 'long' to represent UT
 2718     offsets.  This had been inadvertently and mistakenly changed to
 2719     'int_fast32_t'.  (Thanks to Christos Zoulas.)
 2720 
 2721     The code avoids undefined behavior on integer overflow in some
 2722     more places, including gmtime, localtime, mktime and zdump.
 2723 
 2724   Changes affecting the zdump utility
 2725 
 2726     zdump now outputs "UT" when referring to Universal Time, not "UTC".
 2727     "UTC" does not make sense for timestamps that predate the introduction
 2728     of UTC, whereas "UT", a more-generic term, does.  (Thanks to Steve Allen
 2729     for clarifying UT vs UTC.)
 2730 
 2731   Data changes affecting behavior of tzselect and similar programs
 2732 
 2733     Country code BQ is now called the more-common name "Caribbean Netherlands"
 2734     rather than the more-official "Bonaire, St Eustatius & Saba".
 2735 
 2736     Remove from zone.tab the names America/Montreal, America/Shiprock,
 2737     and Antarctica/South_Pole, as they are equivalent to existing
 2738     same-country-code zones for post-1970 timestamps.  The data entries for
 2739     these names are unchanged, so the names continue to work as before.
 2740 
 2741   Changes affecting code internals
 2742 
 2743     zic -c now runs way faster on 64-bit hosts when given large numbers.
 2744 
 2745     zic now uses vfprintf to avoid allocating and freeing some memory.
 2746 
 2747     tzselect now computes the list of continents from the data,
 2748     rather than have it hard-coded.
 2749 
 2750     Minor changes pacify GCC 4.7.3 and GCC 4.8.1.
 2751 
 2752   Changes affecting the build procedure
 2753 
 2754     The 'leapseconds' file is now generated automatically from a
 2755     new file 'leap-seconds.list', which is a copy of
 2756     <ftp://ftp.nist.gov/pub/time/leap-seconds.list>
 2757     A new source file 'leapseconds.awk' implements this.
 2758     The goal is simplification of the future maintenance of 'leapseconds'.
 2759 
 2760     When building the 'posix' or 'right' subdirectories, if the
 2761     subdirectory would be a copy of the default subdirectory, it is
 2762     now made a symbolic link if that is supported.  This saves about
 2763     2 MB of file system space.
 2764 
 2765     The links America/Shiprock and Antarctica/South_Pole have been
 2766     moved to the 'backward' file.  This affects only nondefault builds
 2767     that omit 'backward'.
 2768 
 2769   Changes affecting version-control only
 2770 
 2771     .gitignore now ignores 'date'.
 2772 
 2773   Changes affecting documentation and commentary
 2774 
 2775     Changes to the 'tzfile' man page
 2776 
 2777       It now mentions that the binary file format may be extended in
 2778       future versions by appending data.
 2779 
 2780       It now refers to the 'zdump' and 'zic' man pages.
 2781 
 2782     Changes to the 'zic' man page
 2783 
 2784       It lists conditions that elicit a warning with '-v'.
 2785 
 2786       It says that the behavior is unspecified when duplicate names
 2787       are given, or if the source of one link is the target of another.
 2788 
 2789       Its examples are updated to match the latest data.
 2790 
 2791       The definition of white space has been clarified slightly.
 2792       (Thanks to Michael Deckers.)
 2793 
 2794     Changes to the 'Theory' file
 2795 
 2796       There is a new section about the accuracy of the tz database,
 2797       describing the many ways that errors can creep in, and
 2798       explaining why so many of the pre-1970 timestamps are wrong or
 2799       misleading (thanks to Steve Allen, Lester Caine, and Garrett
 2800       Wollman for discussions that contributed to this).
 2801 
 2802       The 'Theory' file describes LMT better (this follows a
 2803       suggestion by Guy Harris).
 2804 
 2805       It refers to the 2013 edition of POSIX rather than the 2004 edition.
 2806 
 2807       It's mentioned that excluding 'backward' should not affect the
 2808       other data, and it suggests at least one zone.tab name per
 2809       inhabited country (thanks to Stephen Colebourne).
 2810 
 2811       Some longstanding restrictions on names are documented, e.g.,
 2812       'America/New_York' precludes 'America/New_York/Bronx'.
 2813 
 2814       It gives more reasons for the 1970 cutoff.
 2815 
 2816       It now mentions which time_t variants are supported, such as
 2817       signed integer time_t.  (Thanks to Paul Goyette for reporting
 2818       typos in an experimental version of this change.)
 2819 
 2820       (Thanks to Philip Newton for correcting typos in these changes.)
 2821 
 2822     Documentation and commentary is more careful to distinguish UT in
 2823     general from UTC in particular.  (Thanks to Steve Allen.)
 2824 
 2825     Add a better source for the Zurich 1894 transition.
 2826     (Thanks to Pierre-Yves Berger.)
 2827 
 2828     Update shapefile citations in tz-link.htm.  (Thanks to Guy Harris.)
 2829 
 2830 
 2831 Release 2013d - 2013-07-05 07:38:01 -0700
 2832 
 2833   Changes affecting future timestamps:
 2834 
 2835     Morocco's midsummer transitions this year are July 7 and August 10,
 2836     not July 9 and August 8.  (Thanks to Andrew Paprocki.)
 2837 
 2838     Israel now falls back on the last Sunday of October.
 2839     (Thanks to Ephraim Silverberg.)
 2840 
 2841   Changes affecting past timestamps:
 2842 
 2843     Specify Jerusalem's location more precisely; this changes the pre-1880
 2844     times by 2 s.
 2845 
 2846   Changing affecting metadata only:
 2847 
 2848     Fix typos in the entries for country codes BQ and SX.
 2849 
 2850   Changes affecting code:
 2851 
 2852     Rework the code to fix a bug with handling Australia/Macquarie on
 2853     32-bit hosts (thanks to Arthur David Olson).
 2854 
 2855     Port to platforms like NetBSD, where time_t can be wider than long.
 2856 
 2857     Add support for testing time_t types other than the system's.
 2858     Run 'make check_time_t_alternatives' to try this out.
 2859     Currently, the tests fail for unsigned time_t;
 2860     this should get fixed at some point.
 2861 
 2862   Changes affecting documentation and commentary:
 2863 
 2864     Deemphasize the significance of national borders.
 2865 
 2866     Update the zdump man page.
 2867 
 2868     Remove obsolete NOID comment (thanks to Denis Excoffier).
 2869 
 2870     Update several URLs and comments in the web pages.
 2871 
 2872     Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler).
 2873 
 2874     Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka).
 2875 
 2876 
 2877 Release 2013c - 2013-04-19 16:17:40 -0700
 2878 
 2879   Changes affecting current and future timestamps:
 2880 
 2881     Palestine observed DST starting March 29, 2013.  (Thanks to
 2882     Steffen Thorsen.)  From 2013 on, Gaza and Hebron both observe DST,
 2883     with the predicted rules being the last Thursday in March at 24:00
 2884     to the first Friday on or after September 21 at 01:00.
 2885 
 2886     Assume that the recent change to Paraguay's DST rules is permanent,
 2887     by moving the end of DST to the 4th Sunday in March every year.
 2888     (Thanks to Carlos Raúl Perasso.)
 2889 
 2890   Changes affecting past timestamps:
 2891 
 2892     Fix some historical data for Palestine to agree with that of
 2893     timeanddate.com, as follows:
 2894 
 2895 	  The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not
 2896 	  00:00 Apr 1.
 2897 
 2898 	  The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not
 2899 	  02:00.
 2900 
 2901 	  The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27.
 2902 
 2903 	  The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2.
 2904 
 2905 	  The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01.
 2906 
 2907 	  The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00.
 2908 
 2909     Fix times of habitation for Macquarie to agree with the Tasmania
 2910     Parks & Wildlife Service history, which indicates that permanent
 2911     habitation was 1899-1919 and 1948 on.
 2912 
 2913   Changing affecting metadata only:
 2914 
 2915     Macquarie Island is politically part of Australia, not Antarctica.
 2916     (Thanks to Tobias Conradi.)
 2917 
 2918     Sort Macquarie more-consistently with other parts of Australia.
 2919     (Thanks to Tim Parenti.)
 2920 
 2921 
 2922 Release 2013b - 2013-03-10 22:33:40 -0700
 2923 
 2924   Changes affecting current and future timestamps:
 2925 
 2926     Haiti uses US daylight-saving rules this year, and presumably future years.
 2927     This changes timestamps starting today.  (Thanks to Steffen Thorsen.)
 2928 
 2929     Paraguay will end DST on March 24 this year.
 2930     (Thanks to Steffen Thorsen.)  For now, assume it's just this year.
 2931 
 2932     Morocco does not observe DST during Ramadan;
 2933     try to predict Ramadan in Morocco as best we can.
 2934     (Thanks to Erik Homoet for the heads-up.)
 2935 
 2936   Changes affecting commentary:
 2937 
 2938     Update URLs in tz-link page.  Add URLs for webOS, BB10, iOS.
 2939     Update URL for Solaris.  Mention Internet RFC 6557.
 2940     Update Internet RFCs 2445->5545, 2822->5322.
 2941     Switch from FTP to HTTP for Internet RFCs.
 2942 
 2943 
 2944 Release 2013a - 2013-02-27 09:20:35 -0800
 2945 
 2946   Change affecting binary data format:
 2947 
 2948     The zone offset at the end of version-2-format zone files is now
 2949     allowed to be 24:00, as per POSIX.1-2008.  (Thanks to Arthur David Olson.)
 2950 
 2951   Changes affecting current and future timestamps:
 2952 
 2953     Chile's 2013 rules, and we guess rules for 2014 and later, will be
 2954     the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC.
 2955     (Thanks to Steffen Thorsen and Robert Elz.)
 2956 
 2957     New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen.
 2958     (Thanks to Tobias Conradi and Arthur David Olson.)
 2959 
 2960   Many changes affect historical timestamps before 1940.
 2961   These were deduced from: Milne J. Civil time. Geogr J. 1899
 2962   Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>.
 2963 
 2964   Changes affecting the code:
 2965 
 2966     Fix zic bug that mishandled Egypt's 2010 changes (this also affected
 2967     the data).  (Thanks to Arthur David Olson.)
 2968 
 2969     Fix localtime bug when time_t is unsigned and data files were generated
 2970     by a signed time_t system.  (Thanks to Doug Bailey for reporting and
 2971     to Arthur David Olson for fixing.)
 2972 
 2973     Allow the email address for bug reports to be set by the packager.
 2974     The default is tz@iana.org, as before.  (Thanks to Joseph S. Myers.)
 2975 
 2976     Update HTML checking to be compatible with Ubuntu 12.10.
 2977 
 2978     Check that files are a safe subset of ASCII.  At some point we may
 2979     relax this requirement to a safe subset of UTF-8.  Without the
 2980     check, some non-UTF-8 encodings were leaking into the distribution.
 2981 
 2982   Commentary changes:
 2983 
 2984     Restore a comment about copyright notices that was inadvertently deleted.
 2985     (Thanks to Arthur David Olson.)
 2986 
 2987     Improve the commentary about which districts observe what times
 2988     in Russia.  (Thanks to Oscar van Vlijmen and Arthur David Olson).
 2989 
 2990     Add web page links to tz.js.
 2991 
 2992     Add "Run by the Monkeys" to tz-art.  (Thanks to Arthur David Olson.)
 2993 
 2994 
 2995 Release 2012j - 2012-11-12 18:34:49 -0800
 2996 
 2997   Libya moved to CET this weekend, but with DST planned next year.
 2998   (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.)
 2999 
 3000   Signatures now have the extension .asc, not .sign, as that's more
 3001   standard.  (Thanks to Phil Pennock.)
 3002 
 3003   The output of 'zdump --version', and of 'zic --version', now
 3004   uses a format that is more typical for --version.
 3005   (Thanks to Joseph S. Myers.)
 3006 
 3007   The output of 'tzselect --help', 'zdump --help', and 'zic --help'
 3008   now uses tz@iana.org rather than the old elsie address.
 3009 
 3010   zic -v now complains about abbreviations that are less than 3
 3011   or more than 6 characters, as per Posix.  Formerly, it checked
 3012   for abbreviations that were more than 3.
 3013 
 3014   'make public' no longer puts its temporary directory under /tmp,
 3015   and uses the just-built zic rather than the system zic.
 3016 
 3017   Various fixes to documentation and commentary.
 3018 
 3019 
 3020 Release 2012i - 2012-11-03 12:57:09 -0700
 3021 
 3022   Cuba switches from DST tomorrow at 01:00.  (Thanks to Steffen Thorsen.)
 3023 
 3024   Linker flags can now be specified via LDFLAGS.
 3025   AWK now defaults to 'awk', not 'nawk'.
 3026   The shell in tzselect now defaults to /bin/bash, but this can
 3027   be overridden by specifying KSHELL.
 3028   The main web page now mentions the unofficial GitHub repository.
 3029   (Thanks to Mike Frysinger.)
 3030 
 3031   Tarball signatures can now be built by running 'make signatures'.
 3032   There are also new makefile rules 'tarballs', 'check_public', and
 3033   separate makefile rules for each tarball and signature file.
 3034   A few makefile rules are now more portable to strict POSIX.
 3035 
 3036   The main web page now lists the canonical IANA URL.
 3037 
 3038 
 3039 Release 2012h - 2012-10-26 22:49:10 -0700
 3040 
 3041   Bahia no longer has DST.  (Thanks to Kelley Cook.)
 3042 
 3043   Tocantins has DST.  (Thanks to Rodrigo Severo.)
 3044 
 3045   Israel has new DST rules next year.  (Thanks to Ephraim Silverberg.)
 3046 
 3047   Jordan stays on DST this winter.  (Thanks to Steffen Thorsen.)
 3048 
 3049   Web page updates.
 3050 
 3051   More C modernization, except that at Arthur David Olson's suggestion
 3052   the instances of 'register' were kept.
 3053 
 3054 
 3055 Release 2012g - 2012-10-17 20:59:45 -0700
 3056 
 3057   Samoa fall 2012 and later.  (Thanks to Nicholas Pereira and Robert Elz.)
 3058 
 3059   Palestine fall 2012.  (Thanks to Steffen Thorsen.)
 3060 
 3061   Assume C89.
 3062 
 3063   To attack the version-number problem, this release ships the file
 3064   'Makefile' (which contains the release number) in both the tzcode and
 3065   the tzdata tarballs.  The two Makefiles are identical, and should be
 3066   identical in any matching pair of tarballs, so it shouldn't matter
 3067   which order you extract the tarballs.  Perhaps we can come up with a
 3068   better version-number scheme at some point; this scheme does have the
 3069   virtue of not adding more files.
 3070 
 3071 
 3072 Release 2012f - 2012-09-12 23:17:03 -0700
 3073 
 3074   * australasia (Pacific/Fiji): Fiji DST is October 21 through January
 3075     20 this year.  (Thanks to Steffen Thorsen.)
 3076 
 3077 
 3078 Release 2012e - 2012-08-02 20:44:55 -0700
 3079 
 3080   * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14.
 3081     (Thanks to Steffen Thorsen.)
 3082 
 3083   * Use a single version number for both code and data.
 3084 
 3085   * .gitignore: New file.
 3086 
 3087   * Remove trailing white space.
 3088 
 3089 
 3090 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700
 3091 
 3092   Changes for Morocco's timestamps, which take effect in a couple of
 3093   hours, along with infrastructure changes to accommodate how the tz
 3094   code and data are released on IANA.
 3095 
 3096 
 3097 Release data2012c - 2012-03-27 12:17:25 -0400
 3098 
 3099   africa
 3100 	Summer time changes for Morocco (to start late April 2012)
 3101 
 3102   asia
 3103 	Changes for 2012 for Gaza & the West Bank (Hebron) and Syria
 3104 
 3105   northamerica
 3106 	Haiti following US/Canada rules for 2012 (and we're assuming,
 3107 	for now anyway, for the future).
 3108 
 3109 
 3110 Release 2012b - 2012-03-02 12:29:15 +0700
 3111 
 3112   There is just one change to tzcode2012b (compared with 2012a):
 3113   the Makefile that was accidentally included with 2012a has been
 3114   replaced with the version that should have been there, which is
 3115   identical with the previous version (from tzcode2011i).
 3116 
 3117   There are just two changes in tzdata2012b compared with 2012a.
 3118 
 3119   Most significantly, summer time in Cuba has been delayed 3 weeks
 3120   (now starts April 1 rather than March 11).   Since Mar 11 (the old start
 3121   date, as listed in 2012a) is just a little over a week away, this
 3122   change is urgent.
 3123 
 3124   Less importantly, an excess tab in one of the changes in zone.tab
 3125   in 2012a has been removed.
 3126 
 3127 
 3128 Release 2012a - 2012-03-01 18:28:10 +0700
 3129 
 3130   The changes in tzcode2012a (compared to the previous version, 2011i)
 3131   are entirely to the README and tz-art.htm and tz-link.htm files, if
 3132   none of those concern you, you can ignore the code update.  The changes
 3133   reflect the changed addresses for the mailing list and the code and
 3134   data distribution points & methods (and a link to DateTime::TimeZone::Tzfile
 3135   has been added to tz-link.htm).
 3136 
 3137   In tzdata2012a (compared to the previous release, which was 2011n)
 3138   the major changes are:
 3139 	Chile 2011/2012 and 2012/2013 summer time date adjustments.
 3140 	Falkland Islands onto permanent summer time (we're assuming for the
 3141 		foreseeable future, though 2012 is all we're fairly certain of.)
 3142 	Armenia has abolished Summer Time.
 3143 	Tokelau jumped the International Date Line back last December
 3144 		(just the same as their near neighbour, Samoa).
 3145 	America/Creston is a new zone for a small area of British Columbia
 3146 	There will be a leapsecond 2012-06-30 23:59:60 UTC.
 3147 
 3148   Other minor changes are:
 3149 	Corrections to 1918 Canadian summer time end dates.
 3150 	Updated URL for UK time zone history (in comments)
 3151 	A few typos in Le Corre's list of free French place names (comments)
 3152 
 3153 
 3154 Release data2011n - 2011-10-30 14:57:54 +0700
 3155 
 3156   There are three changes of note - most urgently, Cuba (America/Havana)
 3157   has extended summer time by two weeks, now to end on Nov 13, rather than
 3158   the (already past) Oct 30.   Second, the Pridnestrovian Moldavian Republic
 3159   (Europe/Tiraspol) decided not to split from the rest of Moldova after
 3160   all, and consequently that zone has been removed (again) and reinstated
 3161   in the "backward" file as a link to Europe/Chisinau.   And third, the
 3162   end date for Fiji's summer time this summer was moved forward from the
 3163   earlier planned Feb 26, to Jan 22.
 3164 
 3165   Apart from that, Moldova (MD) returns to a single entry in zone.tab
 3166   (and the incorrect syntax that was in the 2011m version of that file
 3167   is so fixed - it would have been fixed in a different way had this
 3168   change not happened - that's the "missing" sccs version id).
 3169 
 3170 
 3171 Release data2011m - 2011-10-24 21:42:16 +0700
 3172 
 3173   In particular, the typos in comments in the data (2011-11-17 should have
 3174   been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that
 3175   Tim Parenti noted) have been fixed, and the change for Ukraine has been
 3176   made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to
 3177   Tim Parenti, and also Denys Gavrysh)
 3178 
 3179   In addition, I added Europe/Tiraspol to zone.tab.
 3180 
 3181   This time, all the files have new version numbers...  (including the files
 3182   otherwise unchanged in 2011m that were changed in 2011l but didn't get new
 3183   version numbers there...)
 3184 
 3185 
 3186 Release data2011l - 2011-10-10 11:15:43 +0700
 3187 
 3188   There are just 2 changes that cause different generated tzdata files from
 3189   zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil
 3190   is included, but commented out.  Compared with the diff I sent out last week,
 3191   this version also includes attributions for the sources for the changes
 3192   (in much the same format as ado used, but the html tags have not been
 3193   checked, verified, or used in any way at all, so if there are errors there,
 3194   please let me know.)
 3195 
 3196 
 3197 Release data2011k - 2011-09-20 17:54:03 -0400
 3198 
 3199   [not summarized]
 3200 
 3201 
 3202 Release data2011j - 2011-09-12 09:22:49 -0400
 3203 
 3204   (contemporary changes for Samoa; past changes for Kenya, Uganda, and
 3205   Tanzania); there are also two spelling corrections to comments in
 3206   the australasia file (with thanks to Christos Zoulas).
 3207 
 3208 
 3209 Release 2011i - 2011-08-29 05:56:32 -0400
 3210 
 3211   [not summarized]
 3212 
 3213 
 3214 Release data2011h - 2011-06-15 18:41:48 -0400
 3215 
 3216   Russia and Curaçao changes
 3217 
 3218 
 3219 Release 2011g - 2011-04-25 09:07:22 -0400
 3220 
 3221   update the rules for Egypt to reflect its abandonment of DST this year
 3222 
 3223 
 3224 Release 2011f - 2011-04-06 17:14:53 -0400
 3225 
 3226   [not summarized]
 3227 
 3228 
 3229 Release 2011e - 2011-03-31 16:04:38 -0400
 3230 
 3231   Morocco, Chile, and tz-link changes
 3232 
 3233 
 3234 Release 2011d - 2011-03-14 09:18:01 -0400
 3235 
 3236   changes that impact present-day timestamps in Cuba, Samoa, and Turkey
 3237 
 3238 
 3239 Release 2011c - 2011-03-07 09:30:09 -0500
 3240 
 3241   These do affect current timestamps in Chile and Annette Island, Canada.
 3242 
 3243 
 3244 Release 2011b - 2011-02-07 08:44:50 -0500
 3245 
 3246   [not summarized]
 3247 
 3248 
 3249 Release 2011a - 2011-01-24 10:30:16 -0500
 3250 
 3251   [not summarized]
 3252 
 3253 
 3254 Release data2010o - 2010-11-01 09:18:23 -0400
 3255 
 3256   change to the end of DST in Fiji in 2011
 3257 
 3258 
 3259 Release 2010n - 2010-10-25 08:19:17 -0400
 3260 
 3261   [not summarized]
 3262 
 3263 
 3264 Release 2010m - 2010-09-27 09:24:48 -0400
 3265 
 3266   Hong Kong, Vostok, and zic.c changes
 3267 
 3268 
 3269 Release 2010l - 2010-08-16 06:57:25 -0400
 3270 
 3271   [not summarized]
 3272 
 3273 
 3274 Release 2010k - 2010-07-26 10:42:27 -0400
 3275 
 3276   [not summarized]
 3277 
 3278 
 3279 Release 2010j - 2010-05-10 09:07:48 -0400
 3280 
 3281   changes for Bahía de Banderas and for version naming
 3282 
 3283 
 3284 Release data2010i - 2010-04-16 18:50:45 -0400
 3285 
 3286   the end of DST in Morocco on 2010-08-08
 3287 
 3288 
 3289 Release data2010h - 2010-04-05 09:58:56 -0400
 3290 
 3291   [not summarized]
 3292 
 3293 
 3294 Release data2010g - 2010-03-24 11:14:53 -0400
 3295 
 3296   [not summarized]
 3297 
 3298 
 3299 Release 2010f - 2010-03-22 09:45:46 -0400
 3300 
 3301   [not summarized]
 3302 
 3303 
 3304 Release data2010e - 2010-03-08 14:24:27 -0500
 3305 
 3306   corrects the Dhaka bug found by Danvin Ruangchan
 3307 
 3308 
 3309 Release data2010d - 2010-03-06 07:26:01 -0500
 3310 
 3311   [not summarized]
 3312 
 3313 
 3314 Release 2010c - 2010-03-01 09:20:58 -0500
 3315 
 3316   changes including KRE's suggestion for earlier initialization of
 3317   "goahead" and "goback" structure elements
 3318 
 3319 
 3320 Release code2010a - 2010-02-16 10:40:04 -0500
 3321 
 3322   [not summarized]
 3323 
 3324 
 3325 Release data2010b - 2010-01-20 12:37:01 -0500
 3326 
 3327   Mexico changes
 3328 
 3329 
 3330 Release data2010a - 2010-01-18 08:30:04 -0500
 3331 
 3332   changes to Dhaka
 3333 
 3334 
 3335 Release data2009u - 2009-12-26 08:32:28 -0500
 3336 
 3337   changes to DST in Bangladesh
 3338 
 3339 
 3340 Release 2009t - 2009-12-21 13:24:27 -0500
 3341 
 3342   [not summarized]
 3343 
 3344 
 3345 Release data2009s - 2009-11-14 10:26:32 -0500
 3346 
 3347   (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change
 3348 
 3349 
 3350 Release 2009r - 2009-11-09 10:10:31 -0500
 3351 
 3352   "antarctica" and "tz-link.htm" changes
 3353 
 3354 
 3355 Release 2009q - 2009-11-02 09:12:40 -0500
 3356 
 3357   with two corrections as reported by Eric Muller and Philip Newton
 3358 
 3359 
 3360 Release data2009p - 2009-10-23 15:05:27 -0400
 3361 
 3362   Argentina (including San Luis) changes (with the correction from
 3363   Mariano Absatz)
 3364 
 3365 
 3366 Release data2009o - 2009-10-14 16:49:38 -0400
 3367 
 3368   Samoa (commentary only), Pakistan, and Bangladesh changes
 3369 
 3370 
 3371 Release data2009n - 2009-09-22 15:13:38 -0400
 3372 
 3373   added commentary for Argentina and a change to the end of DST in
 3374   2009 in Pakistan
 3375 
 3376 
 3377 Release data2009m - 2009-09-03 10:23:43 -0400
 3378 
 3379   Samoa and Palestine changes
 3380 
 3381 
 3382 Release data2009l - 2009-08-14 09:13:07 -0400
 3383 
 3384   Samoa (comments only) and Egypt
 3385 
 3386 
 3387 Release 2009k - 2009-07-20 09:46:08 -0400
 3388 
 3389   [not summarized]
 3390 
 3391 
 3392 Release data2009j - 2009-06-15 06:43:59 -0400
 3393 
 3394   Bangladesh change (with a short turnaround since the DST change is
 3395   impending)
 3396 
 3397 
 3398 Release 2009i - 2009-06-08 09:21:22 -0400
 3399 
 3400   updating for DST in Bangladesh this year
 3401 
 3402 
 3403 Release 2009h - 2009-05-26 09:19:14 -0400
 3404 
 3405   [not summarized]
 3406 
 3407 
 3408 Release data2009g - 2009-04-20 16:34:07 -0400
 3409 
 3410   Cairo
 3411 
 3412 
 3413 Release data2009f - 2009-04-10 11:00:52 -0400
 3414 
 3415   correct DST in Pakistan
 3416 
 3417 
 3418 Release 2009e - 2009-04-06 09:08:11 -0400
 3419 
 3420   [not summarized]
 3421 
 3422 
 3423 Release 2009d - 2009-03-23 09:38:12 -0400
 3424 
 3425   Morocco, Tunisia, Argentina, and American Astronomical Society changes
 3426 
 3427 
 3428 Release data2009c - 2009-03-16 09:47:51 -0400
 3429 
 3430   change to the start of Cuban DST
 3431 
 3432 
 3433 Release 2009b - 2009-02-09 11:15:22 -0500
 3434 
 3435   [not summarized]
 3436 
 3437 
 3438 Release 2009a - 2009-01-21 10:09:39 -0500
 3439 
 3440   [not summarized]
 3441 
 3442 
 3443 Release data2008i - 2008-10-21 12:10:25 -0400
 3444 
 3445   southamerica and zone.tab files, with Argentina DST rule changes and
 3446   United States zone reordering and recommenting
 3447 
 3448 
 3449 Release 2008h - 2008-10-13 07:33:56 -0400
 3450 
 3451   [not summarized]
 3452 
 3453 
 3454 Release 2008g - 2008-10-06 09:03:18 -0400
 3455 
 3456   Fix a broken HTML anchor and update Brazil's DST transitions;
 3457   there's also a slight reordering of information in tz-art.htm.
 3458 
 3459 
 3460 Release data2008f - 2008-09-09 22:33:26 -0400
 3461 
 3462   [not summarized]
 3463 
 3464 
 3465 Release 2008e - 2008-07-28 14:11:17 -0400
 3466 
 3467   changes by Arthur David Olson and Jesper Nørgaard Welen
 3468 
 3469 
 3470 Release data2008d - 2008-07-07 09:51:38 -0400
 3471 
 3472   changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo
 3473 
 3474 
 3475 Release data2008c - 2008-05-19 17:48:03 -0400
 3476 
 3477   Pakistan, Morocco, and Mongolia
 3478 
 3479 
 3480 Release data2008b - 2008-03-24 08:30:59 -0400
 3481 
 3482   including renaming Asia/Calcutta to Asia/Kolkata, with a backward
 3483   link provided
 3484 
 3485 
 3486 Release 2008a - 2008-03-08 05:42:16 -0500
 3487 
 3488   [not summarized]
 3489 
 3490 
 3491 Release 2007k - 2007-12-31 10:25:22 -0500
 3492 
 3493   most importantly, changes to the "southamerica" file based on
 3494   Argentina's readoption of daylight saving time
 3495 
 3496 
 3497 Release 2007j - 2007-12-03 09:51:01 -0500
 3498 
 3499   1. eliminate the "P" (parameter) macro;
 3500 
 3501   2. the "noncontroversial" changes circulated on the time zone
 3502   mailing list (less the changes to "logwtmp.c");
 3503 
 3504   3. eliminate "too many transition" errors when "min" is used in time
 3505   zone rules;
 3506 
 3507   4. changes by Paul Eggert (including updated information for Venezuela).
 3508 
 3509 
 3510 Release data2007i - 2007-10-30 10:28:11 -0400
 3511 
 3512   changes for Cuba and Syria
 3513 
 3514 
 3515 Release 2007h - 2007-10-01 10:05:51 -0400
 3516 
 3517   changes by Paul Eggert, as well as an updated link to the ICU
 3518   project in tz-link.htm
 3519 
 3520 
 3521 Release 2007g - 2007-08-20 10:47:59 -0400
 3522 
 3523   changes by Paul Eggert
 3524 
 3525   The "leapseconds" file has been updated to incorporate the most
 3526   recent International Earth Rotation and Reference Systems Service
 3527   (IERS) bulletin.
 3528 
 3529   There's an addition to tz-art.htm regarding the television show "Medium".
 3530 
 3531 
 3532 Release 2007f - 2007-05-07 10:46:46 -0400
 3533 
 3534   changes by Paul Eggert (including Haiti, Turks and Caicos, and New
 3535   Zealand)
 3536 
 3537   changes to zic.c to allow hour values greater than 24 (along with
 3538   Paul's improved time value overflow checking)
 3539 
 3540 
 3541 Release 2007e - 2007-04-02 10:11:52 -0400
 3542 
 3543   Syria and Honduras changes by Paul Eggert
 3544 
 3545   zic.c variable renaming changes by Arthur David Olson
 3546 
 3547 
 3548 Release 2007d - 2007-03-20 08:48:30 -0400
 3549 
 3550   changes by Paul Eggert
 3551 
 3552   the elimination of white space at the ends of lines
 3553 
 3554 
 3555 Release 2007c - 2007-02-26 09:09:37 -0500
 3556 
 3557   changes by Paul Eggert
 3558 
 3559 
 3560 Release 2007b - 2007-02-12 09:34:20 -0500
 3561 
 3562   Paul Eggert's proposed change to the quotation handling logic in zic.c.
 3563 
 3564   changes to the commentary in "leapseconds" reflecting the IERS
 3565   announcement that there is to be no positive leap second at the end
 3566   of June 2007.
 3567 
 3568 
 3569 Release 2007a - 2007-01-08 12:28:29 -0500
 3570 
 3571   changes by Paul Eggert
 3572 
 3573   Derick Rethan's Asmara change
 3574 
 3575   Oscar van Vlijmen's Easter Island local mean time change
 3576 
 3577   symbolic link changes
 3578 
 3579 
 3580 Release 2006p - 2006-11-27 08:54:27 -0500
 3581 
 3582   changes by Paul Eggert
 3583 
 3584 
 3585 Release 2006o - 2006-11-06 09:18:07 -0500
 3586 
 3587   changes by Paul Eggert
 3588 
 3589 
 3590 Release 2006n - 2006-10-10 11:32:06 -0400
 3591 
 3592   changes by Paul Eggert
 3593 
 3594 
 3595 Release 2006m - 2006-10-02 15:32:35 -0400
 3596 
 3597   changes for Uruguay, Palestine, and Egypt by Paul Eggert
 3598 
 3599   (minimalist) changes to zic.8 to clarify "until" information
 3600 
 3601 
 3602 Release data2006l - 2006-09-18 12:58:11 -0400
 3603 
 3604   Paul's best-effort work on this coming weekend's Egypt time change
 3605 
 3606 
 3607 Release 2006k - 2006-08-28 12:19:09 -0400
 3608 
 3609   changes by Paul Eggert
 3610 
 3611 
 3612 Release 2006j - 2006-08-21 09:56:32 -0400
 3613 
 3614   changes by Paul Eggert
 3615 
 3616 
 3617 Release code2006i - 2006-08-07 12:30:55 -0400
 3618 
 3619   localtime.c fixes
 3620 
 3621   Ken Pizzini's conversion script
 3622 
 3623 
 3624 Release code2006h - 2006-07-24 09:19:37 -0400
 3625 
 3626   adds public domain notices to four files
 3627 
 3628   includes a fix for transition times being off by a second
 3629 
 3630   adds a new recording to the "arts" file (information courtesy Colin Bowern)
 3631 
 3632 
 3633 Release 2006g - 2006-05-08 17:18:09 -0400
 3634 
 3635   northamerica changes by Paul Eggert
 3636 
 3637 
 3638 Release 2006f - 2006-05-01 11:46:00 -0400
 3639 
 3640   a missing version number problem is fixed (with thanks to Bradley
 3641   White for catching the problem)
 3642 
 3643 
 3644 Release 2006d - 2006-04-17 14:33:43 -0400
 3645 
 3646   changes by Paul Eggert
 3647 
 3648   added new items to tz-arts.htm that were found by Paul
 3649 
 3650 
 3651 Release 2006c - 2006-04-03 10:09:32 -0400
 3652 
 3653   two sets of data changes by Paul Eggert
 3654 
 3655   a fencepost error fix in zic.c
 3656 
 3657   changes to zic.c and the "europe" file to minimize differences
 3658   between output produced by the old 32-bit zic and the new 64-bit
 3659   version
 3660 
 3661 
 3662 Release 2006b - 2006-02-20 10:08:18 -0500
 3663   [tz32code2006b + tz64code2006b + tzdata2006b]
 3664 
 3665   64-bit code
 3666 
 3667   All SCCS IDs were bumped to "8.1" for this release.
 3668 
 3669 
 3670 Release 2006a - 2006-01-30 08:59:31 -0500
 3671 
 3672   changes by Paul Eggert (in particular, Indiana time zone moves)
 3673 
 3674   an addition to the zic manual page to describe how special-case
 3675   transitions are handled
 3676 
 3677 
 3678 Release 2005r - 2005-12-27 09:27:13 -0500
 3679 
 3680   Canadian changes by Paul Eggert
 3681 
 3682   They also add "<pre>" directives to time zone data files and reflect
 3683   changes to warning message logic in "zdump.c" (but with calls to
 3684   "gettext" kept unbundled at the suggestion of Ken Pizzini).
 3685 
 3686 
 3687 Release 2005q - 2005-12-13 09:17:09 -0500
 3688 
 3689   Nothing earth-shaking here:
 3690 	1.  Electronic mail addresses have been removed.
 3691 	2.  Casts of the return value of exit have been removed.
 3692 	3.  Casts of the argument of is.* macros have been added.
 3693 	4.  Indentation in one section of zic.c has been fixed.
 3694 	5.  References to dead URLs in the data files have been dealt with.
 3695 
 3696 
 3697 Release 2005p - 2005-12-05 10:30:53 -0500
 3698 
 3699   "systemv", "tz-link.htm", and "zdump.c" changes
 3700   (less the casts of arguments to the is* macros)
 3701 
 3702 
 3703 Release 2005o - 2005-11-28 10:55:26 -0500
 3704 
 3705   Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert
 3706 
 3707   zdump.c lint fixes by Arthur David Olson
 3708 
 3709 
 3710 Release 2005n - 2005-10-03 09:44:09 -0400
 3711 
 3712   changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan
 3713   et al. changes)
 3714 
 3715 
 3716 Release 2005m - 2005-08-29 12:15:40 -0400
 3717 
 3718   changes by Paul Eggert (with a small tweak to the tz-art change)
 3719 
 3720   a declaration of an unused variable has been removed from zdump.c
 3721 
 3722 
 3723 Release 2005l - 2005-08-22 12:06:39 -0400
 3724 
 3725   changes by Paul Eggert
 3726 
 3727   overflow/underflow checks by Arthur David Olson, minus changes to
 3728   the "Theory" file about the pending addition of 64-bit data (I grow
 3729   less confident of the changes being accepted with each passing day,
 3730   and the changes no longer increase the data files nine-fold--there's
 3731   less than a doubling in size by my local Sun's reckoning)
 3732 
 3733 
 3734 Release 2005k - 2005-07-14 14:14:24 -0400
 3735 
 3736   The "leapseconds" file has been edited to reflect the recently
 3737   announced leap second at the end of 2005.
 3738 
 3739   I've also deleted electronic mail addresses from the files as an
 3740   anti-spam measure.
 3741 
 3742 
 3743 Release 2005j - 2005-06-13 14:34:13 -0400
 3744 
 3745   These reflect changes to limit the length of time zone abbreviations
 3746   and the characters used in those abbreviations.
 3747 
 3748   There are also changes to handle POSIX-style "quoted" timezone
 3749   environment variables.
 3750 
 3751   The changes were circulated on the time zone mailing list; the only
 3752   change since then was the removal of a couple of minimum-length of
 3753   abbreviation checks.
 3754 
 3755 
 3756 Release data2005i - 2005-04-21 15:04:16 -0400
 3757 
 3758   changes (most importantly to Nicaragua and Haiti) by Paul Eggert
 3759 
 3760 
 3761 Release 2005h - 2005-04-04 11:24:47 -0400
 3762 
 3763   changes by Paul Eggert
 3764 
 3765   minor changes to Makefile and zdump.c to produce more useful output
 3766   when doing a "make typecheck"
 3767 
 3768 
 3769 Release 2005g - 2005-03-14 10:11:21 -0500
 3770 
 3771   changes by Paul Eggert (a change to current DST rules in Uruguay and
 3772   an update to a link to time zone software)
 3773 
 3774 
 3775 Release 2005f - 2005-03-01 08:45:32 -0500
 3776 
 3777   data and documentation changes by Paul Eggert
 3778 
 3779 
 3780 Release 2005e - 2005-02-10 15:59:44 -0500
 3781 
 3782   [not summarized]
 3783 
 3784 
 3785 Release code2005d - 2005-01-31 09:21:47 -0500
 3786 
 3787   make zic complain about links to links if the -v flag is used
 3788 
 3789   have "make public" do more code checking
 3790 
 3791   add an include to "localtime.c" for the benefit of gcc systems
 3792 
 3793 
 3794 Release 2005c - 2005-01-17 18:36:29 -0500
 3795 
 3796   get better results when mktime runs on a system where time_t is double
 3797 
 3798   changes to the data files (most importantly to Paraguay)
 3799 
 3800 
 3801 Release 2005b - 2005-01-10 09:19:54 -0500
 3802 
 3803   Get localtime and gmtime working on systems with exotic time_t types.
 3804 
 3805   Update the leap second commentary in the "leapseconds" file.
 3806 
 3807 
 3808 Release 2005a - 2005-01-01 13:13:44 -0500
 3809 
 3810   [not summarized]
 3811 
 3812 
 3813 Release code2004i - 2004-12-14 13:42:58 -0500
 3814 
 3815   Deal with systems where time_t is unsigned.
 3816 
 3817 
 3818 Release code2004h - 2004-12-07 11:40:18 -0500
 3819 
 3820   64-bit-time_t changes
 3821 
 3822 
 3823 Release 2004g - 2004-11-02 09:06:01 -0500
 3824 
 3825   update to Cuba (taking effect this weekend)
 3826 
 3827   other changes by Paul Eggert
 3828 
 3829   correction of the spelling of Oslo
 3830 
 3831   changed versions of difftime.c and private.h
 3832 
 3833 
 3834 Release code2004f - 2004-10-21 10:25:22 -0400
 3835 
 3836   Cope with wide-ranging tm_year values.
 3837 
 3838 
 3839 Release 2004e - 2004-10-11 14:47:21 -0400
 3840 
 3841   Brazil/Argentina/Israel changes by Paul Eggert
 3842 
 3843   changes to tz-link.htm by Paul
 3844 
 3845   one small fix to Makefile
 3846 
 3847 
 3848 Release 2004d - 2004-09-22 08:27:29 -0400
 3849 
 3850   Avoid overflow problems when TM_YEAR_BASE is added to an integer.
 3851 
 3852 
 3853 Release 2004c - 2004-08-11 12:06:26 -0400
 3854 
 3855   asctime-related changes
 3856 
 3857   (variants of) some of the documentation changes suggested by Paul Eggert
 3858 
 3859 
 3860 Release 2004b - 2004-07-19 14:33:35 -0400
 3861 
 3862   data changes by Paul Eggert - most importantly, updates for Argentina
 3863 
 3864 
 3865 Release 2004a - 2004-05-27 12:00:47 -0400
 3866 
 3867   changes by Paul Eggert
 3868 
 3869   Handle DST transitions that occur at the end of a month in some
 3870   years but at the start of the following month in other years.
 3871 
 3872   Add a copy of the correspondence that's the basis for claims about
 3873   DST in the Navajo Nation.
 3874 
 3875 
 3876 Release 2003e - 2003-12-15 09:36:47 -0500
 3877 
 3878   changes by Arthur David Olson (primarily code changes)
 3879 
 3880   changes by Paul Eggert (primarily data changes)
 3881 
 3882   minor changes to "Makefile" and "northamerica" (in the latter case,
 3883   optimization of the "Toronto" rules)
 3884 
 3885 
 3886 Release 2003d - 2003-10-06 09:34:44 -0400
 3887 
 3888   changes by Paul Eggert
 3889 
 3890 
 3891 Release 2003c - 2003-09-16 10:47:05 -0400
 3892 
 3893   Fix bad returns in zic.c's inleap function.
 3894   Thanks to Bradley White for catching the problem!
 3895 
 3896 
 3897 Release 2003b - 2003-09-16 07:13:44 -0400
 3898 
 3899   Add a "--version" option (and documentation) to the zic and zdump commands.
 3900 
 3901   changes to overflow/underflow checking in zic
 3902 
 3903   a localtime typo fix.
 3904 
 3905   Update the leapseconds and tz-art.htm files.
 3906 
 3907 
 3908 Release 2003a - 2003-03-24 09:30:54 -0500
 3909 
 3910   changes by Paul Eggert
 3911 
 3912   a few additions and modifications to the tz-art.htm file
 3913 
 3914 
 3915 Release 2002d - 2002-10-15 13:12:42 -0400
 3916 
 3917   changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab
 3918 
 3919   There's also a new time zone quote in "tz-art.htm".
 3920 
 3921 
 3922 Release 2002c - 2002-04-04 11:55:20 -0500
 3923 
 3924   changes by Paul Eggert
 3925 
 3926   Change zic.c to avoid creating symlinks to files that don't exist.
 3927 
 3928 
 3929 Release 2002b - 2002-01-28 12:56:03 -0500
 3930 
 3931   [These change notes are for Release 2002a, which was corrupted.
 3932   2002b was a corrected version of 2002a.]
 3933 
 3934   changes by Paul Eggert
 3935 
 3936   Update the "leapseconds" file to note that there'll be no leap
 3937   second at the end of June, 2002.
 3938 
 3939   Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone.
 3940 
 3941   Change to "difftime.c" to avoid sizeof problems.
 3942 
 3943 
 3944 Release 2001d - 2001-10-09 13:31:32 -0400
 3945 
 3946   changes by Paul Eggert
 3947 
 3948 
 3949 Release 2001c - 2001-06-05 13:59:55 -0400
 3950 
 3951   changes by Paul Eggert and Andrew Brown
 3952 
 3953 
 3954 Release 2001b - 2001-04-05 16:44:38 -0400
 3955 
 3956   changes by Paul Eggert (modulo jnorgard's typo fix)
 3957 
 3958   tz-art.htm has been HTMLified.
 3959 
 3960 
 3961 Release 2001a - 2001-03-13 12:57:44 -0500
 3962 
 3963   changes by Paul Eggert
 3964 
 3965   An addition to the "leapseconds" file: comments with the text of the
 3966   latest IERS leap second notice.
 3967 
 3968   Trailing white space has been removed from data file lines, and
 3969   repeated spaces in "Rule Jordan" lines in the "asia" file have been
 3970   converted to tabs.
 3971 
 3972 
 3973 Release 2000h - 2000-12-14 15:33:38 -0500
 3974 
 3975   changes by Paul Eggert
 3976 
 3977   one typo fix in the "art" file
 3978 
 3979   With providence, this is the last update of the millennium.
 3980 
 3981 
 3982 Release 2000g - 2000-10-10 11:35:22 -0400
 3983 
 3984   changes by Paul Eggert
 3985 
 3986   correction of John Mackin's name submitted by Robert Elz
 3987 
 3988   Garry Shandling's Daylight Saving Time joke (!?!) from the recent
 3989   Emmy Awards broadcast.
 3990 
 3991 
 3992 Release 2000f - 2000-08-10 09:31:58 -0400
 3993 
 3994   changes by Paul Eggert
 3995 
 3996   Added information in "tz-art.htm" on a Seinfeld reference to DST.
 3997 
 3998   Error checking and messages in the "yearistype" script have been
 3999   improved.
 4000 
 4001 
 4002 Release 2000e - 2000-07-31 09:27:54 -0400
 4003 
 4004   data changes by Paul Eggert
 4005 
 4006   a change to the default value of the defined constant HAVE_STRERROR
 4007 
 4008   the addition of a Dave Barry quote on DST to the tz-arts file
 4009 
 4010 
 4011 Release 2000d - 2000-04-20 15:43:04 -0400
 4012 
 4013   changes to the documentation and code of strftime for C99 conformance
 4014 
 4015   a bug fix for date.c
 4016 
 4017   These are based on (though modified from) changes by Paul Eggert.
 4018 
 4019 
 4020 Release 2000c - 2000-03-04 10:31:43 -0500
 4021 
 4022   changes by Paul Eggert
 4023 
 4024 
 4025 Release 2000b - 2000-02-21 12:16:29 -0500
 4026 
 4027   changes by Paul Eggert and Joseph Myers
 4028 
 4029   modest tweaks to the tz-art.htm and tz-link.htm files
 4030 
 4031 
 4032 Release 2000a - 2000-01-18 09:21:26 -0500
 4033 
 4034   changes by Paul Eggert
 4035 
 4036   The two hypertext documents have also been renamed.
 4037 
 4038 
 4039 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500
 4040 
 4041   Paul Eggert's changes
 4042 
 4043   additions to the "zic" manual page and the "Arts.htm" file
 4044 
 4045 
 4046 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500
 4047 
 4048   [not summarized]
 4049 
 4050 
 4051 Release data1999h - 1999-10-07 03:50:29 -0400
 4052 
 4053   changes by Paul Eggert to "europe" (most importantly, fixing
 4054   Lithuania and Estonia)
 4055 
 4056 
 4057 Release 1999g - 1999-09-28 11:06:18 -0400
 4058 
 4059   data changes by Paul Eggert (most importantly, the change for
 4060   Lebanon that buys correctness for this coming Sunday)
 4061 
 4062   The "code" file contains changes to "Makefile" and "checktab.awk" to
 4063   allow better checking of time zone files before they are published.
 4064 
 4065 
 4066 Release 1999f - 1999-09-23 09:48:14 -0400
 4067 
 4068   changes by Arthur David Olson and Paul Eggert
 4069 
 4070 
 4071 Release 1999e - 1999-08-17 15:20:54 -0400
 4072 
 4073   changes circulated by Paul Eggert, although the change to handling
 4074   of DST-specifying timezone names has been commented out for now
 4075   (search for "XXX" in "localtime.c" for details).  These files also
 4076   do not make any changes to the start of DST in Brazil.
 4077 
 4078   In addition to Paul's changes, there are updates to "Arts.htm" and
 4079   cleanups of URLs.
 4080 
 4081 
 4082 Release 1999d - 1999-03-30 11:31:07 -0500
 4083 
 4084   changes by Paul Eggert
 4085 
 4086   The Makefile's "make public" rule has also been changed to do a test
 4087   compile of each individual time zone data file (which should help
 4088   avoid problems such as the one we had with Nicosia).
 4089 
 4090 
 4091 Release 1999c - 1999-03-25 09:47:47 -0500
 4092 
 4093   changes by Paul Eggert, most importantly the change for Chile.
 4094 
 4095 
 4096 Release 1999b - 1999-02-01 17:51:44 -0500
 4097 
 4098   changes by Paul Eggert
 4099 
 4100   code changes (suggested by Mani Varadarajan, mani at be.com) for
 4101   correct handling of symbolic links when building using a relative directory
 4102 
 4103   code changes to generate correct messages for failed links
 4104 
 4105   updates to the URLs in Arts.htm
 4106 
 4107 
 4108 Release 1999a - 1999-01-19 16:20:29 -0500
 4109 
 4110   error message internationalizations and corrections in zic.c and
 4111   zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz,
 4112   to whom thanks!)
 4113 
 4114 
 4115 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400
 4116 
 4117   changes for Brazil, Chile, and Germany
 4118 
 4119   support for use of "24:00" in the input files for the time zone compiler
 4120 
 4121 
 4122 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400
 4123 
 4124   changes by Paul Eggert
 4125 
 4126   correction to a define in the "private.h" file
 4127 
 4128 
 4129 Release data1998g - 1998-08-11 03:28:35 -0000
 4130   [tzdata1998g.tar.gz is missing!]
 4131 
 4132   Lithuanian change provided by mgedmin at pub.osf.it
 4133 
 4134   Move creation of the GMT link with Etc/GMT to "etcetera" (from
 4135   "backward") to ensure that the GMT file is created even where folks
 4136   don't want the "backward" links (as suggested by Paul Eggert).
 4137 
 4138 
 4139 Release data1998f - 1998-07-20 13:50:00 -0000
 4140   [tzdata1998f.tar.gz is missing!]
 4141 
 4142   Update the "leapseconds" file to include the newly-announced
 4143   insertion at the end of 1998.
 4144 
 4145 
 4146 Release code1998f - 1998-06-01 10:18:31 -0400
 4147 
 4148   addition to localtime.c by Guy Harris
 4149 
 4150 
 4151 Release 1998e - 1998-05-28 09:56:26 -0400
 4152 
 4153   The Makefile is changed to produce zoneinfo-posix rather than
 4154   zoneinfo/posix, and to produce zoneinfo-leaps rather than
 4155   zoneinfo/right.
 4156 
 4157   data changes by Paul Eggert
 4158 
 4159   changes from Guy Harris to provide asctime_r and ctime_r
 4160 
 4161   A usno1998 file (substantially identical to usno1997) has been added.
 4162 
 4163 
 4164 Release 1998d - 1998-05-14 11:58:34 -0400
 4165 
 4166   changes to comments (in particular, elimination of references to CIA maps).
 4167   "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places
 4168   where changes occur.
 4169 
 4170 
 4171 Release 1998c - 1998-02-28 12:32:26 -0500
 4172 
 4173   changes by Paul Eggert (save the "French correction," on which I'll
 4174   wait for the dust to settle)
 4175 
 4176   symlink changes
 4177 
 4178   changes and additions to Arts.htm
 4179 
 4180 
 4181 Release 1998b - 1998-01-17 14:31:51 -0500
 4182 
 4183   URL cleanups and additions
 4184 
 4185 
 4186 Release 1998a - 1998-01-13 12:37:35 -0500
 4187 
 4188   changes by Paul Eggert
 4189 
 4190 
 4191 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500
 4192 
 4193   changes by Paul Eggert, with minor modifications from Arthur David
 4194   Olson to make the files more browser friendly
 4195 
 4196 
 4197 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500
 4198 
 4199   minor changes to put "TZif" at the start of each timezone information file
 4200 
 4201   a rule has also been added to the Makefile so you can
 4202 	make zones
 4203   to just recompile the zone information files (rather than doing a
 4204   full "make install" with its other effects).
 4205 
 4206 
 4207 Release data1997i - 1997-10-07 08:45:38 -0400
 4208 
 4209   changes to Africa by Paul Eggert
 4210 
 4211 
 4212 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400
 4213 
 4214   corrections for Uruguay (and other locations)
 4215 
 4216   Arthur David Olson's simple-minded fix allowing mktime to both
 4217   correctly handle leap seconds and correctly handle tm_sec values
 4218   upon which arithmetic has been performed.
 4219 
 4220 
 4221 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400
 4222 
 4223   Paul Eggert's updates
 4224 
 4225   a small change to a function prototype;
 4226 
 4227   "Music" has been renamed "Arts.htm", HTMLified, and augmented to
 4228   include information on Around the World in Eighty Days.
 4229 
 4230 
 4231 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400
 4232 
 4233   fixes to zic's error handling
 4234 
 4235   changes inspired by the item circulated on Slovenia
 4236 
 4237   The description of Web resources has been HTMLified for browsing
 4238   convenience.
 4239 
 4240   A new piece of tz-related music has been added to the "Music" file.
 4241 
 4242 
 4243 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500
 4244 
 4245   Paul Eggert's latest suggestions
 4246 
 4247 
 4248 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500
 4249 
 4250   changes to "zic.c" to correct performance of the "-s" option
 4251 
 4252   a new file "usno1997"
 4253 
 4254 
 4255 Release data1997c - 1997-03-04 09:58:18 -0500
 4256 
 4257   changes in Israel
 4258 
 4259 
 4260 Release 1997b - 1997-02-27 18:34:19 -0500
 4261 
 4262   The data file incorporates the 1997 leap second.
 4263 
 4264   The code file incorporates Arthur David Olson's take on the
 4265   zic/multiprocessor/directory-creation situation.
 4266 
 4267 
 4268 Release 1997a - 1997-01-21 09:11:10 -0500
 4269 
 4270   Paul Eggert's Antarctica (and other changes)
 4271 
 4272   Arthur David Olson finessed the "getopt" issue by checking against
 4273   both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1
 4274   is returned while SunOS 5.5's manual says EOF is returned).
 4275 
 4276 
 4277 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500
 4278 
 4279   Paul Eggert's latest changes
 4280 
 4281 
 4282 Release code1996n - 1996-12-16 09:42:02 -0500
 4283 
 4284   link snapping fix from Bruce Evans (via Garrett Wollman)
 4285 
 4286 
 4287 Release data1996m - 1996-11-24 02:37:34 -0000
 4288   [tzdata1996m.tar.gz is missing!]
 4289 
 4290   Paul Eggert's batch of changes
 4291 
 4292 
 4293 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500
 4294 
 4295   No functional changes here; the files have simply been changed to
 4296   make more use of ISO style dates in comments. The names of the above
 4297   files now include the year in full.
 4298 
 4299 
 4300 Release code96l - 1996-09-08 17:12:20 -0400
 4301 
 4302   tzcode96k was missing a couple of pieces.
 4303 
 4304 
 4305 Release 96k - 1996-09-08 16:06:22 -0400
 4306 
 4307   the latest round of changes from Paul Eggert
 4308 
 4309   the recent Year 2000 material
 4310 
 4311 
 4312 Release code96j - 1996-07-30 13:18:53 -0400
 4313 
 4314   Set sp->typecnt as suggested by Timothy Patrick Murphy.
 4315 
 4316 
 4317 Release code96i - 1996-07-27 20:11:35 -0400
 4318 
 4319   Paul's suggested patch for strftime %V week numbers
 4320 
 4321 
 4322 Release data96i - 1996-07-01 18:13:04 -0400
 4323 
 4324   "northamerica" and "europe" changes by Paul Eggert
 4325 
 4326 
 4327 Release code96h - 1996-06-05 08:02:21 -0400
 4328 
 4329   fix for handling transitions specified in Universal Time
 4330 
 4331   Some "public domain" notices have also been added.
 4332 
 4333 
 4334 Release code96g - 1996-05-16 14:00:26 -0400
 4335 
 4336   fix for the simultaneous-DST-and-zone-change challenge
 4337 
 4338 
 4339 Release data96h - 1996-05-09 17:40:51 -0400
 4340 
 4341   changes by Paul Eggert
 4342 
 4343 
 4344 Release code96f-data96g - 1996-05-03 03:09:59 -0000
 4345   [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!]
 4346 
 4347   The changes get us some of the way to fixing the problems noted in Paul
 4348   Eggert's letter yesterday (in addition to a few others).  The approach
 4349   has been to make zic a bit smarter about figuring out what time zone
 4350   abbreviations apply just after the time specified in the "UNTIL" part
 4351   of a zone line.  Putting the smarts in zic means avoiding having
 4352   transition times show up in both "Zone" lines and "Rule" lines, which
 4353   in turn avoids multiple transition time entries in time zone files.
 4354   (This also makes the zic input files such as "europe" a bit shorter and
 4355   should ease maintenance.)
 4356 
 4357 
 4358 Release data96f - 1996-04-19 19:20:03 -0000
 4359   [tzdata96f.tar.gz is missing!]
 4360 
 4361   The only changes are to the "northamerica" file; the time zone
 4362   abbreviation for Denver is corrected to MST (and MDT), and the
 4363   comments for Mexico have been updated.
 4364 
 4365 
 4366 Release data96e - 1996-03-19 17:37:26 -0500
 4367 
 4368   Proposals by Paul Eggert, in particular the Portugal change that
 4369   comes into play at the end of this month.
 4370 
 4371 
 4372 Release data96d - 1996-03-18 20:49:39 -0500
 4373 
 4374   [not summarized]
 4375 
 4376 
 4377 Release code96e - 1996-02-29 15:43:27 -0000
 4378   [tzcode96e.tar.gz is missing!]
 4379 
 4380   internationalization changes and the fix to the documentation for strftime
 4381 
 4382 
 4383 Release code96d-data96c - 1996-02-12 11:05:27 -0500
 4384 
 4385   The "code" file simply updates Bob Kridle's electronic address.
 4386 
 4387   The "data" file updates rules for Mexico.
 4388 
 4389 
 4390 Release data96b - 1996-01-27 15:44:42 -0500
 4391 
 4392   Kiribati change
 4393 
 4394 
 4395 Release code96c - 1996-01-16 16:58:15 -0500
 4396 
 4397   leap-year streamlining and binary-search changes
 4398 
 4399   fix to newctime.3
 4400 
 4401 
 4402 Release code96b - 1996-01-10 20:42:39 -0500
 4403 
 4404   fixes and enhancements from Paul Eggert, including code that
 4405   emulates the behavior of recent versions of the SunOS "date"
 4406   command.
 4407 
 4408 
 4409 Release 96a - 1996-01-06 09:08:24 -0500
 4410 
 4411   Israel updates
 4412 
 4413   fixes to strftime.c for correct ISO 8601 week number generation,
 4414   plus support for two new formats ('G' and 'g') to give ISO 8601 year
 4415   numbers (which are not necessarily the same as calendar year numbers)
 4416 
 4417 
 4418 Release code95i-data95m - 1995-12-21 12:46:47 -0500
 4419 
 4420   The latest revisions from Paul Eggert are included, the usno1995
 4421   file has been updated, and a new file ("WWW") covering useful URLs
 4422   has been added.
 4423 
 4424 
 4425 Release code95h-data95l - 1995-12-19 18:10:12 -0500
 4426 
 4427   A simplification of a macro definition, a change to data for Sudan,
 4428   and (for last minute shoppers) notes in the "Music" file on the CD
 4429   "Old Man Time".
 4430 
 4431 
 4432 Release code95g-data95k - 1995-10-30 10:32:47 -0500
 4433 
 4434   (slightly reformatted) 8-bit-clean proposed patch
 4435 
 4436   minor patch: US/Eastern -> America/New_York
 4437 
 4438   snapshot of the USNO's latest data ("usno1995")
 4439 
 4440   some other minor cleanups
 4441 
 4442 
 4443 Release code95f-data95j - 1995-10-28 21:01:34 -0000
 4444   [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!]
 4445 
 4446   European cleanups
 4447 
 4448   support for 64-bit time_t's
 4449 
 4450   optimization in localtime.c
 4451 
 4452 
 4453 Release code95e - 1995-10-13 13:23:57 -0400
 4454 
 4455   the mktime change to scan from future to past when trying to find time zone
 4456   offsets
 4457 
 4458 
 4459 Release data95i - 1995-09-26 10:43:26 -0400
 4460 
 4461   For Canada/Central, guess that the Sun customer's "one week too
 4462   early" was just a approximation, and the true error is one month
 4463   too early.  This is consistent with the rest of Canada.
 4464 
 4465 
 4466 Release data95h - 1995-09-21 11:26:48 -0400
 4467 
 4468   latest changes from Paul Eggert
 4469 
 4470 
 4471 Release code95d - 1995-09-14 11:14:45 -0400
 4472 
 4473   the addition of a "Music" file, which documents four recorded
 4474   versions of the tune "Save That Time".
 4475 
 4476 
 4477 Release data95g - 1995-09-01 17:21:36 -0400
 4478 
 4479   "yearistype" correction
 4480 
 4481 
 4482 Release data95f - 1995-08-28 20:46:56 -0400
 4483 
 4484   Paul Eggert's change to the australasia file
 4485 
 4486 
 4487 Release data95e - 1995-07-08 18:02:34 -0400
 4488 
 4489   The only change is a leap second at the end of this year.
 4490   Thanks to Bradley White for forwarding news on the leap second.
 4491 
 4492 
 4493 Release data95d - 1995-07-03 13:26:22 -0400
 4494 
 4495   Paul Eggert's changes
 4496 
 4497 
 4498 Release data95c - 1995-07-02 19:19:28 -0400
 4499 
 4500   changes to "asia", "backward", "europe", and "southamerica"
 4501   (read: northamericacentrics need not apply)
 4502 
 4503 
 4504 Release code95c - 1995-03-13 14:00:46 -0500
 4505 
 4506   one-line fix for sign extension problems in detzcode
 4507 
 4508 
 4509 Release 95b - 1995-03-04 11:22:38 -0500
 4510 
 4511   Minor changes in both:
 4512 
 4513   The "code" file contains a workaround for the lack of "unistd.h" in
 4514   Microsoft C++ version 7.
 4515 
 4516   The "data" file contains a fixed "Link" for America/Shiprock.
 4517 
 4518 
 4519 Release 94h - 1994-12-10 12:51:14 -0500
 4520 
 4521   The files:
 4522 
 4523   *	incorporate the changes to "zdump" and "date" to make changes to
 4524 	the "TZ" environment variable permanent;
 4525 
 4526   *	incorporate the table changes by Paul Eggert;
 4527 
 4528   *	include (and document) support for universal time specifications in
 4529 	data files - but do not (yet) include use of this feature in the
 4530 	data files.
 4531 
 4532   Think of this as "TZ Classic" - the software has been set up not to break if
 4533   universal time shows up in its input, and data entries have been
 4534   left as is so as not to break existing implementations.
 4535 
 4536 
 4537 Release data94f - 1994-08-20 12:56:09 -0400
 4538 
 4539   (with thanks!) the latest data updates from Paul Eggert
 4540 
 4541 
 4542 Release data94e - 1994-06-04 13:13:53 -0400
 4543 
 4544   [not summarized]
 4545 
 4546 
 4547 Release code94g - 1994-05-05 12:14:07 -0400
 4548 
 4549   fix missing "optind.c" and a reference to it in the Makefile
 4550 
 4551 
 4552 Release code94f - 1994-05-05 13:00:33 -0000
 4553   [tzcode94f.tar.gz is missing!]
 4554 
 4555   changes to avoid overflow in difftime, as well as changes to cope
 4556   with the 52/53 challenge in strftime
 4557 
 4558 
 4559 Release code94e - 1994-03-30 23:32:59 -0500
 4560 
 4561   change for the benefit of PCTS
 4562 
 4563 
 4564 Release 94d - 1994-02-24 15:42:25 -0500
 4565 
 4566   Avoid clashes with POSIX semantics for zones such as GMT+4.
 4567 
 4568   Some other very minor housekeeping is also present.
 4569 
 4570 
 4571 Release code94c - 1994-02-10 08:52:40 -0500
 4572 
 4573   Fix bug where mkdirs was broken unless you compile with
 4574   -fwritable-strings (which is generally losing to do).
 4575 
 4576 
 4577 Release 94b - 1994-02-07 10:04:33 -0500
 4578 
 4579   work by Paul Eggert who notes:
 4580 
 4581   I found another book of time zone histories by E W Whitman; it's not
 4582   as extensive as Shanks but has a few goodies of its own.  I used it
 4583   to update the tables.  I also fixed some more as a result of
 4584   correspondence with Adam David and Peter Ilieve, and move some stray
 4585   links from 'europe' to 'backward'.  I corrected some scanning errors
 4586   in usno1989.
 4587 
 4588   As far as the code goes, I fixed zic to allow years in the range
 4589   INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900.
 4590   And I cleaned up the zic documentation a little bit.
 4591 
 4592 
 4593 Release data94a - 1994-02-03 08:58:54 -0500
 4594 
 4595   It simply incorporates the recently announced leap second into the
 4596   "leapseconds" file.
 4597 
 4598 
 4599 Release 93g - 1993-11-22 17:28:27 -0500
 4600 
 4601   Paul Eggert has provided a good deal of historic information (based
 4602   on Shanks), and there are some code changes to deal with the buglets
 4603   that crawled out in dealing with the new information.
 4604 
 4605 
 4606 Release 93f - 1993-10-15 12:27:46 -0400
 4607 
 4608   Paul Eggert's changes
 4609 
 4610 
 4611 Release 93e - 1993-09-05 21:21:44 -0400
 4612 
 4613   This has updated data for Israel, England, and Kwajalein.  There's
 4614   also an update to "zdump" to cope with Kwajalein's 24-hour jump.
 4615   Thanks to Paul Eggert and Peter Ilieve for the changes.
 4616 
 4617 
 4618 Release 93d - 1993-06-17 23:34:17 -0400
 4619 
 4620   new fix and new data on Israel
 4621 
 4622 
 4623 Release 93c - 1993-06-06 19:31:55 -0400
 4624 
 4625   [not summarized]
 4626 
 4627 
 4628 Release 93b - 1993-02-02 14:53:58 -0500
 4629 
 4630   updated "leapseconds" file
 4631 
 4632 
 4633 Release 93 - 1993-01-08 07:01:06 -0500
 4634 
 4635   At kre's suggestion, the package has been split in two - a code piece
 4636   (which also includes documentation) that's only of use to folks who
 4637   want to recompile things and a data piece useful to anyone who can
 4638   run "zic".
 4639 
 4640   The new version has a few changes to the data files, a few
 4641   portability changes, and an off-by-one fix (with thanks to
 4642   Tom Karzes at deshaw.com for providing a description and a
 4643   solution).
 4644 
 4645 
 4646 Release 92c - 1992-11-21 17:35:36 -0000
 4647   [tz92c.tar.Z is missing!]
 4648 
 4649   The fallout from the latest round of DST transitions.
 4650 
 4651   There are changes for Portugal, Saskatchewan, and "Pacific-New";
 4652   there's also a change to "zic.c" that makes it portable to more systems.
 4653 
 4654 
 4655 Release 92 - 1992-04-25 18:17:03 -0000
 4656   [tz92.tar.Z is missing!]
 4657 
 4658   By popular demand (well, at any rate, following a request by kre at munnari)
 4659 
 4660 
 4661 The 1989 update of the time zone package featured:
 4662 
 4663   *	POSIXization (including interpretation of POSIX-style TZ environment
 4664 	variables, provided by Guy Harris),
 4665   *	ANSIfication (including versions of "mktime" and "difftime"),
 4666   *	SVIDulation (an "altzone" variable)
 4667   *	MACHination (the "gtime" function)
 4668   *	corrections to some time zone data (including corrections to the rules
 4669 	for Great Britain and New Zealand)
 4670   *	reference data from the United States Naval Observatory for folks who
 4671 	want to do additional time zones
 4672   *	and the 1989 data for Saudi Arabia.
 4673 
 4674   (Since this code will be treated as "part of the implementation" in some
 4675   places and as "part of the application" in others, there's no good way to
 4676   name functions, such as timegm, that are not part of the proposed ANSI C
 4677   standard; such functions have kept their old, underscore-free names in this
 4678   update.)
 4679 
 4680   And the "dysize" function has disappeared; it was present to allow
 4681   compilation of the "date" command on old BSD systems, and a version of "date"
 4682   is now provided in the package.  The "date" command is not created when you
 4683   "make all" since it may lack options provided by the version distributed with
 4684   your operating system, or may not interact with the system in the same way
 4685   the native version does.
 4686 
 4687   Since POSIX frowns on correct leap second handling, the default behavior of
 4688   the "zic" command (in the absence of a "-L" option) has been changed to omit
 4689   leap second information from its output files.
 4690 
 4691 
 4692 -----
 4693 Notes
 4694 
 4695 This file contains copies of the part of each release announcement
 4696 that talks about the changes in that release.  The text has been
 4697 adapted and reformatted for the purposes of this file.
 4698 
 4699 Traditionally a release R consists of a pair of tarball files,
 4700 tzcodeR.tar.gz and tzdataR.tar.gz.  However, some releases (e.g.,
 4701 code2010a, data2012c) consist of just one or the other tarball, and a
 4702 few (e.g., code2012c-data2012d) have tarballs with mixed version
 4703 numbers.  Recent releases also come in an experimental format
 4704 consisting of a single tarball tzdb-R.tar.lz with extra data.
 4705 
 4706 Release timestamps are taken from the release's commit (for newer,
 4707 Git-based releases), from the newest file in the tarball (for older
 4708 releases, where this info is available) or from the email announcing
 4709 the release (if all else fails; these are marked with a time zone
 4710 abbreviation of -0000 and an "is missing!" comment).
 4711 
 4712 Earlier versions of the code and data were not announced on the tz
 4713 list and are not summarized here.
 4714 
 4715 This file is in the public domain.
 4716 
 4717 Local Variables:
 4718 coding: utf-8
 4719 End: