1 News for the tz database
3 Release 2017c - 2017-10-20 14:49:34 -0700
6 Northern Cyprus switches from +03 to +02/+03 on 2017-10-29.
7 Fiji ends DST 2018-01-14, not 2018-01-21.
8 Namibia switches from +01/+02 to +02 on 2018-04-01.
9 Sudan switches from +03 to +02 on 2017-11-01.
10 Tonga likely switches from +13/+14 to +13 on 2017-11-05.
11 Turks & Caicos switches from -04 to -05/-04 on 2018-11-04.
12 A new file tzdata.zi now holds a small text copy of all data.
13 The zic input format has been regularized slightly.
15 Changes to future time stamps
17 Northern Cyprus has decided to resume EU rules starting
18 2017-10-29, thus reinstituting winter time.
20 Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously
21 predicted. (Thanks to Dominic Fok.) Adjust future predictions
24 Namibia will switch from +01 with DST to +02 all year on
25 2017-09-03 at 02:00. This affects UT offsets starting 2018-04-01
26 at 02:00. (Thanks to Steffen Thorsen.)
28 Sudan will switch from +03 to +02 on 2017-11-01. (Thanks to Ahmed
29 Atyya and Yahia Abdalla.) South Sudan is not switching, so
30 Africa/Juba is no longer a link to Africa/Khartoum.
32 Tonga has likely ended its experiment with DST, and will not
33 adjust its clocks on 2017-11-05. Although Tonga has not announced
34 whether it will continue to observe DST, the IATA is assuming that
35 it will not. (Thanks to David Wade.)
37 Turks & Caicos will switch from -04 all year to -05 with US DST on
38 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04
39 at 02:00. (Thanks to Steffen Thorsen.)
41 Changes to past time stamps
43 Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03.
44 (Thanks to Arthur David Olson.)
46 Detroit did not observe DST in 1967.
48 Use railway time for Asia/Kolkata before 1941, by switching to
49 Madras local time (UT +052110) in 1870, then to IST (UT +0530) in
50 1906. Also, treat 1941-2's +0630 as DST, like 1942-5.
52 Europe/Dublin's 1946 and 1947 fallback transitions occurred at
53 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.)
55 Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to
56 American time in 1892, not 1879. (Thanks to Michael Deckers.)
58 Adjust the 1867 transition in Alaska to better reflect the
59 historical record, by changing it to occur on 1867-10-18 at 15:30
60 Sitka time rather than at the start of 1867-10-17 local time.
61 Although strictly speaking this is accurate only for Sitka,
62 the rest of Alaska's blanks need to be filled in somehow.
64 Fix off-by-one errors in UT offsets for Adak and Nome before 1867.
65 (Thanks to Michael Deckers.)
67 Add 7 s to the UT offset in Asia/Yangon before 1920.
71 Remove Canada/East-Saskatchewan from the 'backward' file, as it
72 exceeded the 14-character limit and was an unused misnomer anyway.
74 Changes to build procedure
76 To support applications that prefer to read time zone data in text
77 form, two zic input files tzdata.zi and leapseconds are now
78 installed by default. The commands 'zic tzdata.zi' and 'zic -L
79 leapseconds tzdata.zi' can reproduce the tzdata binary files
80 without and with leap seconds, respectively. To prevent these two
81 new files from being installed, use 'make TZDATA_TEXT=', and to
82 suppress leap seconds from the tzdata text installation, use 'make
83 TZDATA_TEXT=tzdata.zi'.
85 'make BACKWARD=' now suppresses backward-compatibility names
86 like 'US/Pacific' that are defined in the 'backward' and
89 'make check' now works on systems that lack a UTF-8 locale,
90 or that lack the nsgmls program. Set UTF8_LOCALE to configure
91 the name of a UTF-8 locale, if you have one.
93 Y2K runtime checks are no longer enabled by default. Add
94 -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of
95 adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU
96 to disable them. (New name suggested by Brian Inglis.)
98 The build procedure for zdump now works on AIX 7.1.
99 (Problem reported by Kees Dekker.)
103 zic and the reference runtime now reject multiple leap seconds
104 within 28 days of each other, or leap seconds before the Epoch.
105 As a result, support for double leap seconds, which was
106 obsolescent and undocumented, has been removed. Double leap
107 seconds were an error in the C89 standard; they have never existed
108 in civil timekeeping. (Thanks to Robert Elz and Bradley White for
109 noticing glitches in the code that uncovered this problem.)
111 zic now warns about use of the obsolescent and undocumented -y
112 option, and about use of the obsolescent TYPE field of Rule lines.
114 zic now allows unambiguous abbreviations like "Sa" and "Su" for
115 weekdays; formerly it rejected them due to a bug. Conversely, zic
116 no longer considers non-prefixes to be abbreviations; for example,
117 it no longer accepts "lF" as an abbreviation for "lastFriday".
118 Also, zic warns about the undocumented usage with a "last-"
119 prefix, e.g., "last-Fri".
121 Similarly, zic now accepts the unambiguous abbreviation "L" for
122 "Link" in ordinary context and for "Leap" in leap-second context.
123 Conversely, zic no longer accepts non-prefixes such as "La" as
124 abbreviations for words like "Leap".
126 zic no longer accepts leap second lines in ordinary input, or
127 ordinary lines in leap second input. Formerly, zic sometimes
128 warned about this undocumented usage and handled it incorrectly.
130 The new macro HAVE_TZNAME governs whether the tzname external
131 variable is exported, instead of USG_COMPAT. USG_COMPAT now
132 governs only the external variables "timezone" and "daylight".
133 This change is needed because the three variables are not in the
134 same category: although POSIX requires tzname, it specifies the
135 other two variables as optional. Also, USG_COMPAT is now 1 or 0:
136 if not defined, the code attempts to guess it from other macros.
138 localtime.c and difftime.c no longer require stdio.h, and .c files
139 other than zic.c no longer require sys/wait.h.
141 zdump.c no longer assumes snprintf. (Reported by Jonathan Leffler.)
143 Calculation of time_t extrema works around a bug in GCC 4.8.4
144 (Reported by Stan Shebs and Joseph Myers.)
146 zic.c no longer mistranslates formats of line numbers in non-English
147 locales. (Problem reported by Benno Schulenberg.)
149 Several minor changes have been made to the code to make it a
150 bit easier to port to MS-Windows and Solaris. (Thanks to Kees
151 Dekker for reporting the problems.)
153 Changes to documentation and commentary
155 The two new files 'theory.html' and 'calendars' contain the
156 contents of the removed file 'Theory'. The goal is to document
157 tzdb theory more accessibly.
159 The zic man page now documents abbreviation rules.
161 tz-link.htm now covers how to apply tzdata changes to clients.
162 (Thanks to Jorge Fábregas for the AIX link.) It also mentions MySQL.
164 The leap-seconds.list URL has been updated to something that is
165 more reliable for tzdb. (Thanks to Tim Parenti and Brian Inglis.)
167 Release 2017b - 2017-03-17 07:30:38 -0700
169 Briefly: Haiti has resumed DST.
171 Changes to past and future time stamps
173 Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.)
175 Changes to past time stamps
177 Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01.
179 Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430"
180 is one byte over the POSIX limit. (Problem reported by Derick Rethans.)
184 The reference localtime implementation now falls back on the
185 current US daylight-saving transition rules rather than the
186 1987-2006 rules. This fallback occurs only when (1) the TZ
187 environment variable's value has a name like "AST4ADT" that asks
188 for daylight saving time but does not specify the rules, (2) there
189 is no file by that name, and (3) the TZDEFRULES file cannot be
190 loaded. (Thanks to Tom Lane.)
193 Release 2017a - 2017-02-28 00:05:36 -0800
195 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia
198 Changes to future time stamps
200 Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.)
202 Chile's Region of Magallanes moves from -04/-03 to -03 year-round.
203 Its clocks diverge from America/Santiago starting 2017-05-13 at
204 23:00, hiving off a new zone America/Punta_Arenas. Although the
205 Chilean government says this change expires in May 2019, for now
206 assume it's permanent. (Thanks to Juan Correa and Deborah
207 Goldsmith.) This also affects Antarctica/Palmer.
209 Changes to past time stamps
211 Fix many entries for historical time stamps for Europe/Madrid
212 before 1979, to agree with tables compiled by Pere Planesas of the
213 National Astronomical Observatory of Spain. As a side effect,
214 this changes some time stamps for Africa/Ceuta before 1929, which
215 are probably guesswork anyway. (Thanks to Steve Allen and
216 Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for
217 correcting the 1901 transition.)
219 Ecuador observed DST from 1992-11-28 to 1993-02-05.
220 (Thanks to Alois Treindl.)
222 Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21.
223 (Thanks to Stepan Golosunov.)
225 Changes to past and future time zone abbreviations
227 Switch to numeric time zone abbreviations for South America, as
228 part of the ongoing project of removing invented abbreviations.
229 This avoids the need to invent an abbreviation for the new Chilean
230 new zone. Similarly, switch from invented to numeric time zone
231 abbreviations for Afghanistan, American Samoa, the Azores,
232 Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei,
233 Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is,
234 Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland,
235 Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia,
236 the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia,
237 Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau,
238 Papua New Guinea, the Philippines, Pitcairn, Qatar, RĂ©union, St
239 Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore,
240 Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and
241 Xinjiang; for 20-minute daylight saving time in Ghana before 1943;
242 for half-hour daylight saving time in Belize before 1944 and in
243 the Dominican Republic before 1975; and for Canary Islands before
244 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for
245 Indian Summer Time before 1942, for Indonesia before around 1964,
246 for Kenya before 1960, for Liberia before 1973, for Madeira before
247 1967, for Namibia before 1943, for the Netherlands in 1937-9, for
248 Pakistan before 1971, for Western Sahara before 1977, and for
249 Zaporozhye in 1880-1924.
251 For Alaska time from 1900 through 1967, instead of "CAT" use the
252 abbreviation "AST", the abbreviation commonly used at the time
253 (Atlantic Standard Time had not been standardized yet). Use "AWT"
254 and "APT" instead of the invented abbreviations "CAWT" and "CAPT".
256 Use "CST" and "CDT" instead of invented abbreviations for Macau
257 before 1999 and Taiwan before 1938, and use "JST" instead of the
258 invented abbreviation "JCST" for Japan and Korea before 1938.
260 Change to database entry category
262 Move the Pacific/Johnston link from 'australasia' to 'backward',
263 since Johnston is now uninhabited.
267 zic no longer mishandles some transitions in January 2038 when it
268 attempts to work around Qt bug 53071. This fixes a bug affecting
269 Pacific/Tongatapu that was introduced in zic 2016e. localtime.c
270 now contains a workaround, useful when loading a file generated by
271 a buggy zic. (Problem and localtime.c fix reported by Bradley
274 zdump -i now outputs non-hour numeric time zone abbreviations
275 without a colon, e.g., "+0530" rather than "+05:30". This agrees
276 with zic %z and with common practice, and simplifies auditing of
279 zdump is now buildable again with -DUSE_LTZ=0.
280 (Problem reported by Joseph Myers.)
282 zdump.c now always includes private.h, to avoid code duplication
283 with private.h. (Problem reported by Kees Dekker.)
285 localtime.c no longer mishandles early or late timestamps
286 when TZ is set to a POSIX-style string that specifies DST.
287 (Problem reported by Kees Dekker.)
289 date and strftime now cause %z to generate "-0000" instead of
290 "+0000" when the UT offset is zero and the time zone abbreviation
293 Changes to documentation and commentary
295 The 'Theory' file now better documents choice of historical time
296 zone abbreviations. (Problems reported by Michael Deckers.)
298 tz-link.htm now covers leap smearing, which is popular in clouds.
301 Release 2016j - 2016-11-22 23:17:13 -0800
303 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04.
305 Changes to future time stamps
307 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00.
308 This hives off a new zone Europe/Saratov from Europe/Volgograd.
309 (Thanks to Yuri Konotopov and Stepan Golosunov.)
311 Changes to past time stamps
313 The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like
314 Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring
315 1999, not fall 1994. (Thanks to Stepan Golosunov.)
317 Changes to past time zone abbreviations
319 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote
320 summer time before 1948. The old use of "EET" was a typo.
324 zic no longer mishandles file systems that lack hard links, fixing
325 bugs introduced in 2016g. (Problems reported by Tom Lane.)
326 Also, when the destination already contains symbolic links, zic
327 should now work better on systems where the 'link' system call
328 does not follow symbolic links.
330 Changes to documentation and commentary
332 tz-link.htm now documents the relationship between release version
333 numbers and development-repository commit tags. (Suggested by
336 The 'Theory' file now documents UT.
338 iso3166.tab now accents "Curaçao", and commentary now mentions
339 the names "Cabo Verde" and "Czechia". (Thanks to Jiřà Boháč.)
342 Release 2016i - 2016-11-01 23:19:52 -0700
344 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga
345 reintroduces DST on 2016-11-06.
347 Changes to future time stamps
349 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on
350 2017-01-15 at 03:00. Assume future observances in Tonga will be
351 from the first Sunday in November through the third Sunday in
352 January, like Fiji. (Thanks to Pulu ʻAnau.) Switch to numeric
353 time zone abbreviations for this zone.
355 Changes to past and future time stamps
357 Northern Cyprus is now +03 year round, causing a split in Cyprus
358 time zones starting 2016-10-30 at 04:00. This creates a zone
359 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.)
361 Antarctica/Casey switched from +08 to +11 on 2016-10-22.
362 (Thanks to Steffen Thorsen.)
364 Changes to past time stamps
366 Several corrections were made for pre-1975 time stamps in Italy.
367 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and
370 First, the 1893-11-01 00:00 transition in Italy used the new UT
371 offset (+01), not the old (+00:49:56). (Thanks to Michael
374 Second, rules for daylight saving in Italy were changed to agree
375 with Italy's National Institute of Metrological Research (INRiM)
376 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian
377 Inglis, and Michael Deckers):
379 The 1916-06-03 transition was at 24:00, not 00:00.
381 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at
384 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not
387 The 1944-09-17 transition was at 03:00, not 01:00. This
388 particular change is taken from Italian law as INRiM's table,
389 (which says 02:00) appears to have a typo here. Also, keep the
390 1944-04-03 transition for Europe/Rome, as Rome was controlled by
393 The 1967-1970 and 1972-1974 fallback transitions were at 01:00,
398 The code should now be buildable on AmigaOS merely by setting the
399 appropriate Makefile variables. (From a patch by Carsten Larsen.)
402 Release 2016h - 2016-10-19 23:17:57 -0700
404 Changes to future time stamps
406 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not
407 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that
408 future fall transitions will be on the last Saturday of October
409 at 01:00, which is consistent with predicted spring transitions
410 on the last Saturday of March. (Thanks to Tim Parenti.)
412 Changes to past time stamps
414 In Turkey, transitions in 1986-1990 were at 01:00 standard time
415 not at 02:00, and the spring 1994 transition was on March 20, not
416 March 27. (Thanks to Kıvanç Yazan.)
418 Changes to past and future time zone abbreviations
420 Asia/Colombo now uses numeric time zone abbreviations like "+0530"
421 instead of alphabetic ones like "IST" and "LKT". Various
422 English-language sources use "IST", "LKT" and "SLST", with no
423 working consensus. (Usage of "SLST" mentioned by Sadika
428 zic no longer mishandles relativizing file names when creating
429 symbolic links like /etc/localtime, when these symbolic links
430 are outside the usual directory hierarchy. This fixes a bug
431 introduced in 2016g. (Problem reported by Andreas Stieger.)
433 Changes to build procedure
435 New rules 'traditional_tarballs' and 'traditional_signatures' for
436 building just the traditional-format distribution. (Requested by
439 The file 'version' is now put into the tzdata tarball too.
440 (Requested by Howard Hinnant.)
442 Changes to documentation and commentary
444 The 'Theory' file now has a section on interface stability.
445 (Requested by Paul Koning.) It also mentions features like
446 tm_zone and localtime_rz that have long been supported by the
449 tz-link.htm has improved coverage of time zone boundaries suitable
450 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt
453 The US commentary now mentions Allen and the "day of two noons".
455 The Fiji commentary mentions the government's 2016-10-03 press
456 release. (Thanks to Raymond Kumar.)
459 Release 2016g - 2016-09-13 08:56:38 -0700
461 Changes to future time stamps
463 Turkey switched from EET/EEST (+02/+03) to permanent +03,
464 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather
465 than an invented abbreviation for the new time.
467 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52.
468 (Thanks to Tim Parenti.)
470 Changes to past time stamps
472 For America/Los_Angeles, spring-forward transition times have been
473 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in
476 For zones using Soviet time on 1919-07-01, transitions to UT-based
477 time were at 00:00 UT, not at 02:00 local time. The affected
478 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and
479 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.)
481 Changes to past and future time zone abbreviations
483 The Factory zone now uses the time zone abbreviation -00 instead
484 of a long English-language string, as -00 is now the normal way to
485 represent an undefined time zone.
487 Several zones in Antarctica and the former Soviet Union, along
488 with zones intended for ships at sea that cannot use POSIX TZ
489 strings, now use numeric time zone abbreviations instead of
490 invented or obsolete alphanumeric abbreviations. The affected
491 zones are Antarctica/Casey, Antarctica/Davis,
492 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera,
493 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok,
494 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita,
495 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga,
496 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin,
497 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi,
498 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg,
499 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11,
500 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5,
501 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2,
502 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8,
503 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad,
504 Europe/Minsk, Europe/Samara, Europe/Volgograd, and
505 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM
506 was replaced by +05, whereas MSK and MSD were kept as they are not
507 our invention and are widely used.
509 Changes to zone names
511 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link.
512 (Thanks to David Massoud.)
516 zic no longer generates binary files containing POSIX TZ-like
517 strings that disagree with the local time type after the last
518 explicit transition in the data. This fixes a bug with
519 Africa/Casablanca and Africa/El_Aaiun in some year-2037 time
520 stamps on the reference platform. (Thanks to Alexander Belopolsky
521 for reporting the bug and suggesting a way forward.)
523 If the installed localtime and/or posixrules files are symbolic
524 links, zic now keeps them symbolic links when updating them, for
525 compatibility with platforms like OpenSUSE where other programs
526 configure these files as symlinks.
528 zic now avoids hard linking to symbolic links, avoids some
529 unnecessary mkdir and stat system calls, and uses shorter file
532 zdump has a new -i option to generate transitions in a
533 more-compact but still human-readable format. This option is
534 experimental, and the output format may change in future versions.
535 (Thanks to Jon Skeet for suggesting that an option was needed,
536 and thanks to Tim Parenti and Chris Rovick for further comments.)
538 Changes to build procedure
540 An experimental distribution format is available, in addition
541 to the traditional format which will continue to be distributed.
542 The new format is a tarball tzdb-VERSION.tar.lz with signature
543 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory
544 tzdb-VERSION containing the code and data of the traditional
545 two-tarball format, along with extra data that may be useful.
546 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others
547 for comments about the experimental format.)
549 The release version number is now more accurate in the usual case
550 where releases are built from a Git repository. For example, if
551 23 commits and some working-file changes have been made since
552 release 2016g, the version number is now something like
553 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'.
554 Tagged releases use the same version number format as before,
555 e.g., '2016g'. To support the more-accurate version number, its
556 specification has moved from a line in the Makefile to a new
557 source file 'version'.
559 The experimental distribution contains a file to2050.tzs that
560 contains what should be the output of 'zdump -i -c 2050' on
561 primary zones. If this file is available, 'make check' now checks
562 that zdump generates this output.
564 'make check_web' now works on Fedora-like distributions.
566 Changes to documentation and commentary
568 tzfile.5 now documents the new restriction on POSIX TZ-like
569 strings that is now implemented by zic.
571 Comments now cite URLs for some 1917-1921 Russian DST decrees.
572 (Thanks to Alexander Belopolsky.)
574 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J
575 (thanks to Meno Hochschild) and ThreeTen-Extra, and its
576 description of Java 8 has been brought up to date (thanks to
577 Stephen Colebourne). Its description of local time on Mars has
578 been updated to match current practice, and URLs have been updated
579 and some obsolete ones removed.
582 Release 2016f - 2016-07-05 16:26:51 +0200
584 Changes affecting future time stamps
586 The Egyptian government changed its mind on short notice, and
587 Africa/Cairo will not introduce DST starting 2016-07-07 after all.
588 (Thanks to Mina Samuel.)
590 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00.
591 (Thanks to Stepan Golosunov.)
593 Changes to past and future time stamps
595 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone
596 abbreviations instead of invented ones.
598 Changes affecting past time stamps
600 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00.
601 (Thanks to Stepan Golosunov.)
604 Release 2016e - 2016-06-14 08:46:16 -0700
606 Changes affecting future time stamps
608 Africa/Cairo observes DST in 2016 from July 7 to the end of October.
609 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.)
610 For future years, guess April's last Thursday to October's last
611 Thursday except for Ramadan.
613 Changes affecting past time stamps
615 Locations while uninhabited now use '-00', not 'zzz', as a
616 placeholder time zone abbreviation. This is inspired by Internet
617 RFC 3339 and is more consistent with numeric time zone
618 abbreviations already used elsewhere. The change affects several
619 arctic and antarctic locations, e.g., America/Cambridge_Bay before
620 1920 and Antarctica/Troll before 2005.
622 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was
623 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.)
627 zic now outputs a dummy transition at time 2**31 - 1 in zones
628 whose POSIX-style TZ strings contain a '<'. This mostly works
629 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>.
630 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.)
632 Changes affecting documentation and commentary
634 tz-link.htm says why governments should give plenty of notice for
635 time zone or DST changes, and refers to Matt Johnson's blog post.
637 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.)
640 Release 2016d - 2016-04-17 22:50:29 -0700
642 Changes affecting future time stamps
644 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30.
645 (Thanks to Alexander Krivenyshev for the heads-up.)
647 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00.
648 (Thanks to Alexander Krivenyshev and Matt Johnson.)
650 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers
651 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29
652 at 02:00. (Thanks to Stepan Golosunov.)
654 Changes affecting past time stamps
656 New zone Europe/Kirov, split off from Europe/Volgograd. It covers
657 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on
658 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made
659 the same change. (Thanks to Stepan Golosunov.)
661 Russia and nearby locations had daylight-saving transitions on
662 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on
663 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan
666 Many corrections to historical time in Kazakhstan from 1991
667 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's
668 invented time zone abbreviations with numeric abbreviations.
670 Changes to commentary
672 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references).
675 Release 2016c - 2016-03-23 00:51:27 -0700
677 Changes affecting future time stamps
679 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.)
681 Chile reverts from permanent to seasonal DST. (Thanks to Juan
682 Correa for the heads-up, and to Tim Parenti for corrections.)
683 Guess that future transitions are August's and May's second
684 Saturdays at 24:00 mainland time. Also, call the period from
685 2014-09-07 through 2016-05-14 daylight saving time instead of
686 standard time, as that seems more appropriate now.
688 Changes affecting past time stamps
690 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to
691 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed
692 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26.
693 (Thanks to Stepan Golosunov.)
695 Changes to commentary
697 Several updates and URLs for historical and proposed Russian changes.
698 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.)
701 Release 2016b - 2016-03-12 17:30:14 -0800
705 Starting with release 2016b, some data entries cause zic implementations
706 derived from tz releases 2005j through 2015e to issue warnings like
707 "time zone abbreviation differs from POSIX standard (+03)".
708 These warnings should not otherwise affect zic's output and can safely be
709 ignored on today's platforms, as the warnings refer to a restriction in
710 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the
711 warnings is to upgrade to zic derived from tz releases 2015f and later.
713 Changes affecting future time stamps
715 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and
716 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on
717 2016-03-27 at 02:00 local time. They need distinct zones since their
718 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and
719 Altai Republic, Russia, which will switch from +06 to +07 on the same date
720 and local time. The Astrakhan change is already official; the others have
721 passed the first reading in the State Duma and are extremely likely.
722 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00.
723 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson
724 and Stepan Golosunov for followup.)
726 As a trial of a new system that needs less information to be made up,
727 the new zones use numeric time zone abbreviations like "+04"
728 instead of invented abbreviations like "ASTT".
730 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via
733 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00.
734 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last
735 Saturday at 01:00, not March's last Friday at 24:00.
737 Changes affecting past time stamps
739 Europe/Chisinau observed DST during 1990, and switched from +04 to
740 +03 at 1990-05-06 02:00, instead of switching from +03 to +02.
741 (Thanks to Stepan Golosunov.)
743 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not
744 KUYT/KUYST. (Thanks to Stepan Golosunov.)
748 tzselect's diagnostics and checking, and checktab.awk's checking,
749 have been improved. (Thanks to J William Piggott.)
751 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.)
753 tzselect now tests Julian-date TZ settings more accurately.
754 (Thanks to J William Piggott.)
756 Changes to commentary
758 Comments in zone tables have been improved. (Thanks to J William Piggott.)
760 tzselect again limits its menu comments so that menus fit on a
761 24x80 alphanumeric display.
763 A new web page tz-how-to.html. (Thanks to Bill Seymour.)
765 In the Theory file, the description of possible time zone abbreviations in
766 tzdata has been cleaned up, as the old description was unclear and
767 inconsistent. (Thanks to Alain Mouette for reporting the problem.)
770 Release 2016a - 2016-01-26 23:28:02 -0800
772 Changes affecting future time stamps
774 America/Cayman will not observe daylight saving this year after all.
775 Revert our guess that it would. (Thanks to Matt Johnson.)
777 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00.
778 (Thanks to Alexander Krivenyshev.)
780 Asia/Tehran now has DST predictions for the year 2038 and later,
781 to be March 21 00:00 to September 21 00:00. This is likely better
782 than predicting no DST, albeit off by a day every now and then.
784 Changes affecting past and future time stamps
786 America/Metlakatla switched from PST all year to AKST/AKDT on
787 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.)
789 America/Santa_Isabel has been removed, and replaced with a
790 backward compatibility link to America/Tijuana. Its contents were
791 apparently based on a misreading of Mexican legislation.
793 Changes affecting past time stamps
795 Asia/Karachi's two transition times in 2002 were off by a minute.
796 (Thanks to Matt Johnson.)
798 Changes affecting build procedure
800 An installer can now combine leap seconds with use of the backzone file,
801 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'.
802 The old 'make posix_packrat' rule is now marked as obsolescent.
803 (Thanks to Ian Abbott for an initial implementation.)
805 Changes affecting documentation and commentary
807 A new file LICENSE makes it easier to see that the code and data
808 are mostly public-domain. (Thanks to James Knight.) The three
809 non-public-domain files now use the current (3-clause) BSD license
810 instead of older versions of that license.
812 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki),
813 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section
814 on editing tz source files (with a mention of Sublime zoneinfo,
815 thanks to Gilmore Davidson).
817 The Theory and asia files now mention the 2015 book "The Global
818 Transformation of Time, 1870-1950", and cite a couple of reviews.
820 The America/Chicago entry now documents the informal use of US
821 central time in Fort Pierre, South Dakota. (Thanks to Rick
822 McDermid, Matt Johnson, and Steve Jones.)
825 Release 2015g - 2015-10-01 00:39:51 -0700
827 Changes affecting future time stamps
829 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25.
832 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time.
833 (Thanks to Alexander Krivenyshev.)
835 Fiji's 2016 fall-back transition is scheduled for January 17, not 24.
836 (Thanks to Ken Rylander.)
838 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has
839 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08.
840 New zone America/Fort_Nelson. (Thanks to Matt Johnson.)
842 Changes affecting past time stamps
844 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00.
846 Changes affecting code
848 localtime no longer mishandles America/Anchorage after 2037.
849 (Thanks to Bradley White for reporting the bug.)
851 On hosts with signed 32-bit time_t, localtime no longer mishandles
852 Pacific/Fiji after 2038-01-16 14:00 UTC.
854 The localtime module allows the variables 'timezone', 'daylight',
855 and 'altzone' to be in common storage shared with other modules,
856 and declares them in case the system <time.h> does not.
857 (Problems reported by Kees Dekker.)
859 On platforms with tm_zone, strftime.c now assumes it is not NULL.
860 This simplifies the code and is consistent with zdump.c.
861 (Problem reported by Christos Zoulas.)
863 Changes affecting documentation
865 The tzfile man page now documents that transition times denote the
866 starts (not the ends) of the corresponding time periods.
867 (Ambiguity reported by Bill Seymour.)
870 Release 2015f - 2015-08-10 18:06:56 -0700
872 Changes affecting future time stamps
874 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.)
875 The abbreviation remains "KST". (Thanks to Robert Elz.)
877 Uruguay no longer observes DST. (Thanks to Steffen Thorsen
880 Changes affecting past and future time stamps
882 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC.
883 (Thanks to Roman Tudos.)
885 Changes affecting data format and code
887 zic's '-y YEARISTYPE' option is no longer documented. The TYPE
888 field of a Rule line should now be '-'; the old values 'even',
889 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented.
890 Although the implementation has not changed, these features do not
891 work in the default installation, they are not used in the data,
892 and they are now considered obsolescent.
894 zic now checks that two rules don't take effect at the same time.
895 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on
896 simultaneity are now documented.
898 The two characters '%z' in a zone format now stand for the UTC
899 offset, e.g., '-07' for seven hours behind UTC and '+0530' for
900 five hours and thirty minutes ahead. This better supports time
901 zone abbreviations conforming to POSIX.1-2001 and later.
903 Changes affecting installed data files
905 Comments for America/Halifax and America/Glace_Bay have been improved.
906 (Thanks to Brian Inglis.)
908 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol,
909 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller
910 installed data files for Europe/Simferopol and Europe/Tallinn.
911 It does not affect timestamps. (Thanks to Howard Hinnant.)
913 Changes affecting code
915 zdump and zic no longer warn about valid time zone abbreviations
918 Some Visual Studio 2013 warnings have been suppressed.
919 (Thanks to Kees Dekker.)
921 'date' no longer sets the time of day and its -a, -d, -n and -t
922 options have been removed. Long obsolescent, the implementation
923 of these features had porting problems. Builders no longer need
924 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H.
925 (Thanks to Kees Dekker for pointing out the problem.)
927 Changes affecting documentation
929 The Theory file mentions naming issues earlier, as these seem to be
930 poorly publicized (thanks to Gilmore Davidson for reporting the problem).
932 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant).
934 Mention that Herbert Samuel introduced the term "Summer Time".
937 Release 2015e - 2015-06-13 10:56:02 -0700
939 Changes affecting future time stamps
941 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00,
942 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.)
944 Assume Cayman Islands will observe DST starting next year, using US rules.
945 Although it isn't guaranteed, it is the most likely.
947 Changes affecting data format
949 The file 'iso3166.tab' now uses UTF-8, so that its entries can better
950 spell the names of Ă…land Islands, CĂ´te d'Ivoire, and RĂ©union.
952 Changes affecting code
954 When displaying data, tzselect converts it to the current locale's
955 encoding if the iconv command works. (Problem reported by random832.)
957 tzselect no longer mishandles Dominica, fixing a bug introduced
958 in Release 2014f. (Problem reported by Owen Leibman.)
960 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\".
961 This fixes a bug introduced in Release 2014f.
962 (Problem reported by Leonardo Chiquitto.)
965 Release 2015d - 2015-04-24 08:09:46 -0700
967 Changes affecting future time stamps
969 Egypt will not observe DST in 2015 and will consider canceling it
970 permanently. For now, assume no DST indefinitely.
971 (Thanks to Ahmed Nazmy and Tim Parenti.)
973 Changes affecting past time stamps
975 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not
976 1966-07-01. Also, Yukon's time zone history is documented better.
977 (Thanks to Brian Inglis and Dennis Ferguson.)
979 Change affecting past and future time zone abbreviations
981 The abbreviations for Hawaii-Aleutian standard and daylight times
982 have been changed from HAST/HADT to HST/HDT, as per US Government
983 Printing Office style. This affects only America/Adak since 1983,
984 as America/Honolulu was already using the new style.
986 Changes affecting code
988 zic has some minor performance improvements.
991 Release 2015c - 2015-04-11 08:55:55 -0700
993 Changes affecting future time stamps
995 Egypt's spring-forward transition is at 24:00 on April's last Thursday,
996 not 00:00 on April's last Friday. 2015's transition will therefore be on
997 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes
998 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.)
1000 Changes affecting past time stamps
1002 The following changes affect some pre-1991 Chile-related time stamps
1003 in America/Santiago, Antarctica/Palmer, and Pacific/Easter.
1005 The 1910 transition was January 10, not January 1.
1007 The 1918 transition was September 10, not September 1.
1009 The UT -04 time observed from 1932 to 1942 is now considered to
1010 be standard time, not year-round DST.
1012 Santiago observed DST (UT -03) from 1946-07-15 through
1013 1946-08-31, then reverted to standard time, then switched to -05
1016 Assume transitions before 1968 were at 00:00, since we have no data
1019 The spring 1988 transition was 1988-10-09, not 1988-10-02.
1020 The fall 1990 transition was 1990-03-11, not 1990-03-18.
1022 Assume no UTC offset change for Pacific/Easter on 1890-01-01,
1023 and omit all transitions on Pacific/Easter from 1942 through 1946
1024 since we have no data suggesting that they existed.
1026 One more zone has been turned into a link, as it differed
1027 from an existing zone only for older time stamps. As usual,
1028 this change affects UTC offsets in pre-1970 time stamps only.
1029 The zone's old contents have been moved to the 'backzone' file.
1030 The affected zone is America/Montreal.
1032 Changes affecting commentary
1034 Mention the TZUpdater tool.
1036 Mention "The Time Now". (Thanks to Brandon Ramsey.)
1039 Release 2015b - 2015-03-19 23:28:11 -0700
1041 Changes affecting future time stamps
1043 Mongolia will start observing DST again this year, from the last
1044 Saturday in March at 02:00 to the last Saturday in September at 00:00.
1045 (Thanks to Ganbold Tsagaankhuu.)
1047 Palestine will start DST on March 28, not March 27. Also,
1048 correct the fall 2014 transition from September 26 to October 24.
1049 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.)
1051 Changes affecting past time stamps
1053 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a
1054 regression. (Thanks to Stuart Bishop for reporting the problem.)
1056 Some more zones have been turned into links, when they differed
1057 from existing zones only for older time stamps. As usual,
1058 these changes affect UTC offsets in pre-1970 time stamps only.
1059 Their old contents have been moved to the 'backzone' file.
1060 The affected zones are: America/Antigua, America/Cayman,
1061 Pacific/Midway, and Pacific/Saipan.
1063 Changes affecting time zone abbreviations
1065 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD".
1068 Changes affecting code
1070 Fix integer overflow bug in reference 'mktime' implementation.
1071 (Problem reported by Jörg Richter.)
1073 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries
1074 to be used in the same executable as standard-library time_t functions.
1075 (Problems reported by Bradley White.)
1077 Changes affecting commentary
1079 Cite the recent Mexican decree changing Quintana Roo's time zone.
1080 (Thanks to Carlos RaĂşl Perasso.)
1082 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.)
1084 Update info about Mars time.
1087 Release 2015a - 2015-01-29 22:35:20 -0800
1089 Changes affecting future time stamps
1091 The Mexican state of Quintana Roo, represented by America/Cancun,
1092 will shift from Central Time with DST to Eastern Time without DST
1093 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.)
1095 Chile will not change clocks in April or thereafter; its new standard time
1096 will be its old daylight saving time. This affects America/Santiago,
1097 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.)
1099 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
1100 (Thanks to Tim Parenti.)
1102 Changes affecting past time stamps
1104 Iceland observed DST in 1919 and 1921, and its 1939 fallback
1105 transition was Oct. 29, not Nov. 29. Remove incorrect data from
1106 Shanks about time in Iceland between 1837 and 1908.
1108 Some more zones have been turned into links, when they differed
1109 from existing zones only for older time stamps. As usual,
1110 these changes affect UTC offsets in pre-1970 time stamps only.
1111 Their old contents have been moved to the 'backzone' file.
1112 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
1115 Changes affecting code
1117 tzalloc now scrubs time zone abbreviations compatibly with the way
1118 that tzset always has, by replacing invalid bytes with '_' and by
1119 shortening too-long abbreviations.
1121 tzselect ports to POSIX awk implementations, no longer mishandles
1122 POSIX TZ settings when GNU awk is used, and reports POSIX TZ
1123 settings to the user. (Thanks to Stefan Kuhn.)
1125 Changes affecting build procedure
1127 'make check' now checks for links to links in the data.
1128 One such link (for Africa/Asmera) has been fixed.
1129 (Thanks to Stephen Colebourne for pointing out the problem.)
1131 Changes affecting commentary
1133 The leapseconds file commentary now mentions the expiration date.
1134 (Problem reported by Martin Burnicki.)
1136 Update Mexican Library of Congress URL.
1139 Release 2014j - 2014-11-10 17:37:11 -0800
1141 Changes affecting current and future time stamps
1143 Turks & Caicos' switch from US eastern time to UT -04 year-round
1144 did not occur on 2014-11-02 at 02:00. It's currently scheduled
1145 for 2015-11-01 at 02:00. (Thanks to Chris Walton.)
1147 Changes affecting past time stamps
1149 Many pre-1989 time stamps have been corrected for Asia/Seoul and
1150 Asia/Pyongyang, based on sources for the Korean-language Wikipedia
1151 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no
1152 longer guess that Pyongyang mimicked Seoul time after World War II,
1153 as this is politically implausible.
1155 Some more zones have been turned into links, when they differed
1156 from existing zones only for older time stamps. As usual,
1157 these changes affect UTC offsets in pre-1970 time stamps only.
1158 Their old contents have been moved to the 'backzone' file.
1159 The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
1160 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
1161 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and
1164 Changes affecting commentary
1166 The commentary is less enthusiastic about Shanks as a source,
1167 and is more careful to distinguish UT from UTC.
1170 Release 2014i - 2014-10-21 22:04:57 -0700
1172 Changes affecting future time stamps
1174 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
1175 (Thanks to Ken Rylander for the heads-up.) Guess that future
1176 years will use a similar pattern.
1178 A new Zone Pacific/Bougainville, for the part of Papua New Guinea
1179 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00.
1180 (Thanks to Kiley Walbom for the heads-up.)
1182 Changes affecting time zone abbreviations
1184 Since Belarus is not changing its clocks even though Moscow is,
1185 the time zone abbreviation in Europe/Minsk is changing from FET
1186 to its more-traditional value MSK on 2014-10-26 at 01:00.
1187 (Thanks to Alexander Bokovoy for the heads-up about Belarus.)
1189 The new abbreviation IDT stands for the pre-1976 use of UT +08 in
1190 Indochina, to distinguish it better from ICT (+07).
1192 Changes affecting past time stamps
1194 Many time stamps have been corrected for Asia/Ho_Chi_Minh before 1976
1195 (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
1196 authoritative book). Asia/Ho_Chi_Minh has been added to
1197 zone1970.tab, to give tzselect users in Vietnam two choices,
1198 since north and south Vietnam disagreed after our 1970 cutoff.
1200 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
1201 they differed from existing zones only for older time stamps. As
1202 usual, these changes affect pre-1970 time stamps only. Their old
1203 contents have been moved to the 'backzone' file.
1205 Changes affecting code
1207 The time-related library functions now set errno on failure, and
1208 some crashes in the new tzalloc-related library functions have
1209 been fixed. (Thanks to Christos Zoulas for reporting most of
1210 these problems and for suggesting fixes.)
1212 If USG_COMPAT is defined and the requested timestamp is standard time,
1213 the tz library's localtime and mktime functions now set the extern
1214 variable timezone to a value appropriate for that timestamp; and
1215 similarly for ALTZONE, daylight saving time, and the altzone variable.
1216 This change is a companion to the tzname change in 2014h, and is
1217 designed to make timezone and altzone more compatible with tzname.
1219 The tz library's functions now set errno to EOVERFLOW if they fail
1220 because the result cannot be represented. ctime and ctime_r now
1221 return NULL and set errno when a timestamp is out of range, rather
1222 than having undefined behavior.
1224 Some bugs associated with the new 2014g functions have been fixed.
1225 This includes a bug that largely incapacitated the new functions
1226 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.)
1227 It also includes some uses of uninitialized variables after tzalloc.
1228 The new code uses the standard type 'ssize_t', which the Makefile
1229 now gives porting advice about.
1231 Changes affecting commentary
1233 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis).
1236 Release 2014h - 2014-09-25 18:59:03 -0700
1238 Changes affecting past timestamps
1240 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.
1242 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01,
1243 not 1920-01-06. The old entry was based on a misinterpretation of Shanks.
1245 Some more zones have been turned into links, when they differed
1246 from existing zones only for older timestamps. As usual,
1247 these changes affect UTC offsets in pre-1970 timestamps only.
1248 Their old contents have been moved to the 'backzone' file.
1249 The affected zones are: Africa/Blantyre, Africa/Bujumbura,
1250 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
1251 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane.
1253 Changes affecting code
1255 zdump -V and -v now output gmtoff= values on all platforms,
1256 not merely on platforms defining TM_GMTOFF.
1258 The tz library's localtime and mktime functions now set tzname to a value
1259 appropriate for the requested timestamp, and zdump now uses this
1260 on platforms not defining TM_ZONE, fixing a 2014g regression.
1261 (Thanks to Tim Parenti for reporting the problem.)
1263 The tz library no longer sets tzname if localtime or mktime fails.
1265 zdump -c no longer mishandles transitions near year boundaries.
1266 (Thanks to Tim Parenti for reporting the problem.)
1268 An access to uninitialized data has been fixed.
1269 (Thanks to Jörg Richter for reporting the problem.)
1271 When THREAD_SAFE is defined, the code ports to the C11 memory model.
1272 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined
1273 and two threads race to initialize data used by gmtime-like functions.
1274 (Thanks to Andy Heninger for reporting the problems.)
1276 Changes affecting build procedure
1278 'make check' now checks better for properly-sorted data.
1280 Changes affecting documentation and commentary
1282 zdump's gmtoff=N output is now documented, and its isdst=D output
1283 is now documented to possibly output D values other than 0 or 1.
1285 zdump -c's treatment of years is now documented to use the
1286 Gregorian calendar and Universal Time without leap seconds,
1287 and its behavior at cutoff boundaries is now documented better.
1288 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.)
1290 Programs are now documented to use the proleptic Gregorian calendar.
1291 (Thanks to Alan Barrett for the suggestion.)
1293 Fractional-second GMT offsets have been documented for civil time
1294 in 19th-century Chennai, Jakarta, and New York.
1297 Release 2014g - 2014-08-28 12:31:23 -0700
1299 Changes affecting future timestamps
1301 Turks & Caicos is switching from US eastern time to UT -04
1302 year-round, modeled as a switch on 2014-11-02 at 02:00.
1303 [As noted in 2014j, this switch was later delayed.]
1305 Changes affecting past timestamps
1307 Time in Russia or the USSR before 1926 or so has been corrected by
1308 a few seconds in the following zones: Asia/Irkutsk,
1309 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi,
1310 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For
1311 Asia/Yekaterinburg the correction is a few minutes. (Thanks to
1312 Vladimir Karpinsky.)
1314 The Portuguese decree of 1911-05-26 took effect on 1912-01-01.
1315 This affects 1911 timestamps in Africa/Bissau, Africa/Luanda,
1316 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912
1317 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32.
1318 (Thanks to Stephen Colebourne for pointing to the decree.)
1320 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59.
1322 A new file 'backzone' contains data which may appeal to
1323 connoisseurs of old timestamps, although it is out of scope for
1324 the tz database, is often poorly sourced, and contains some data
1325 that is known to be incorrect. The new file is not recommended
1326 for ordinary use and its entries are not installed by default.
1327 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and
1328 Isle of Man entries.)
1330 Some more zones have been turned into links, when they differed
1331 from existing zones only for older timestamps. As usual,
1332 these changes affect UTC offsets in pre-1970 timestamps only.
1333 Their old contents have been moved to the 'backzone' file.
1334 The affected zones are: Africa/Bangui, Africa/Brazzaville,
1335 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
1336 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
1338 Changes affecting code
1340 Unless NETBSD_INSPIRED is defined to 0, the tz library now
1341 supplies functions for creating and using objects that represent
1342 time zones. The new functions are tzalloc, tzfree, localtime_rz,
1343 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
1344 time2posix_z. They are intended for performance: for example,
1345 localtime_rz (unlike localtime_r) is trivially thread-safe without
1346 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired
1347 functions, and to Alan Barrett and Jonathan Lennox for helping to
1350 zdump now builds with the tz library unless USE_LTZ is defined to 0,
1351 This lets zdump use tz features even if the system library lacks them.
1352 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0
1353 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
1355 zdump now uses localtime_rz if available, as it's significantly faster,
1356 and it can help zdump better diagnose invalid time zone names.
1357 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ
1358 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is
1359 not available, zdump now uses localtime_r and tzset if available,
1360 as this is a bit cleaner and faster than plain localtime. Compile
1361 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
1362 lacks these two functions.
1364 If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
1365 Although not needed for tz's own applications, which are single-threaded,
1366 this supports POSIX better if the tz library is used in multithreaded apps.
1368 Some crashes have been fixed when zdump or the tz library is given
1369 invalid or outlandish input.
1371 The tz library no longer mishandles leap seconds on platforms with
1372 unsigned time_t in time zones that lack ordinary transitions after 1970.
1374 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
1375 already defined, to make it easier to configure on common platforms.
1376 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
1378 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
1379 assumes that reading uninitialized memory yields garbage values
1380 but does not cause other problems such as traps.
1382 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now
1383 more likely to guess right for ambiguous timestamps near
1384 transitions where tm_isdst does not change.
1386 If HAVE_STRFTIME_L is defined to 1, the tz library now defines
1387 strftime_l for compatibility with recent versions of POSIX.
1388 Only the C locale is supported, though. HAVE_STRFTIME_L defaults
1389 to 1 on recent POSIX versions, and to 0 otherwise.
1391 tzselect -c now uses a hybrid distance measure that works better
1392 in Africa. (Thanks to Alan Barrett for noting the problem.)
1394 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used,
1395 or when time_tz is defined.
1397 When HAVE_UTMPX_H is set the 'date' command now builds on systems
1398 whose <utmpx.h> file does not define WTMPX_FILE, and when setting
1399 the date it updates the wtmpx file if _PATH_WTMPX is defined.
1400 This affects GNU/Linux and similar systems.
1402 For easier maintenance later, some C code has been simplified,
1403 some lint has been removed, and the code has been tweaked so that
1404 plain 'make' is more likely to work.
1406 The C type 'bool' is now used for boolean values, instead of 'int'.
1408 The long-obsolete LOCALE_HOME code has been removed.
1410 The long-obsolete 'gtime' function has been removed.
1412 Changes affecting build procedure
1414 'zdump' no longer links in ialloc.o, as it's not needed.
1416 'make check_time_t_alternatives' no longer assumes GNU diff.
1418 Changes affecting distribution tarballs
1420 The files checktab.awk and zoneinfo2tdf.pl are now distributed in
1421 the tzdata tarball instead of the tzcode tarball, since they help
1422 maintain the data. The NEWS and Theory files are now also
1423 distributed in the tzdata tarball, as they're relevant for data.
1424 (Thanks to Alan Barrett for pointing this out.) Also, the
1425 leapseconds.awk file is no longer distributed in the tzcode
1426 tarball, since it belongs in the tzdata tarball (where 2014f
1427 inadvertently also distributed it).
1429 Changes affecting documentation and commentary
1431 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for
1432 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms
1435 The man pages have been updated to use function prototypes,
1436 to document thread-safe variants like localtime_r, and to document
1437 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and
1440 The fields in Link lines have been renamed to be more descriptive
1441 and more like the parameters of 'ln'. LINK-FROM has become TARGET,
1442 and LINK-TO has become LINK-NAME.
1444 tz-link.htm mentions the IETF's tzdist working group; Windows
1445 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
1447 Some broken URLs have been fixed in the commentary. (Thanks to
1450 Commentary about Philippines DST has been updated, and commentary
1451 on pre-1970 time in India has been added.
1454 Release 2014f - 2014-08-05 17:42:36 -0700
1456 Changes affecting future timestamps
1458 Russia will subtract an hour from most of its time zones on 2014-10-26
1459 at 02:00 local time. (Thanks to Alexander Krivenyshev.)
1460 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky
1461 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug
1462 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast
1463 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic
1464 (Europe/Samara) are not changing their clocks. The changed zones are
1465 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd,
1466 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk,
1467 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga,
1468 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours
1469 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected,
1470 but not its UTC offset. Two zones are added: Asia/Chita (split
1471 from Asia/Yakutsk, and also with two hours subtracted) and
1472 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour
1473 subtracted). (Thanks to Tim Parenti for much of the above.)
1475 Changes affecting time zone abbreviations
1477 Australian eastern time zone abbreviations are now AEST/AEDT not EST,
1478 and similarly for the other Australian zones. That is, for eastern
1479 standard and daylight saving time the abbreviations are AEST and AEDT
1480 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
1481 and AWST/AWDT are now used instead of the former CST, CWST, and WST.
1482 This change does not affect UTC offsets, only time zone abbreviations.
1483 (Thanks to Rich Tibbett and many others.)
1485 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07)
1486 effective 2014-10-26 at 02:00 local time.
1488 The time zone abbreviation for Xinjiang Time (observed in ĂśrĂĽmqi)
1489 has been changed from URUT to XJT. (Thanks to Luther Ma.)
1491 Prefer MSK/MSD for Moscow time in Russia, even in other cities.
1492 Similarly, prefer EET/EEST for eastern European time in Russia.
1494 Change time zone abbreviations in (western) Samoa to use "ST" and
1495 "DT" suffixes, as this is more likely to match common practice.
1496 Prefix "W" to (western) Samoa time when its standard-time offset
1497 disagrees with that of American Samoa.
1499 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone.
1501 Time zone abbreviations have been updated for Japan's two time
1502 zones used 1896-1937. JWST now stands for Western Standard
1503 Time, and JCST for Central Standard Time (formerly this was CJT).
1504 These abbreviations are now used for time in Korea, Taiwan,
1505 and Sakhalin while controlled by Japan.
1507 Changes affecting past timestamps
1509 China's five zones have been simplified to two, since the post-1970
1510 differences in the other three seem to have been imaginary. The
1511 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been
1512 removed; backwards-compatibility links still work, albeit with
1513 different behaviors for timestamps before May 1980. Asia/Urumqi's
1514 1980 transition to UT +08 has been removed, so that it is now at
1515 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl;
1516 Treindl sent helpful translations of two papers by Guo Qingsheng.)
1518 Some zones have been turned into links, when they differed from existing
1519 zones only for older UTC offsets where data entries were likely invented.
1520 These changes affect UTC offsets in pre-1970 timestamps only. This is
1521 similar to the change in release 2013e, except this time for western
1522 Africa. The affected zones are: Africa/Bamako, Africa/Banjul,
1523 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,
1524 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and
1525 Atlantic/St_Helena. This also affects the backwards-compatibility
1526 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne,
1527 Tim Parenti, and David Patte for reporting problems in earlier
1528 versions of this change.)
1530 Asia/Shanghai's pre-standard-time UT offset has been changed from
1531 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its
1532 transition to standard time has been changed from 1928 to 1901.
1534 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01,
1535 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945.
1536 In 1946 it observed DST from 05-15 through 09-30; in 1947
1537 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30.
1538 (Thanks to Yu-Cheng Chuang.)
1540 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950.
1542 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not
1543 10-03 at 00:00. (Thanks to Konstantin Hyppönen.)
1545 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the
1546 period from 1911 to 1950.
1548 Pacific/Chatham has been changed to New Zealand standard time plus
1549 45 minutes for the period before 1957, reflecting a 1956 remark in
1550 the New Zealand parliament.
1552 Europe/Budapest has several pre-1946 corrections: in 1918 the transition
1553 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in
1554 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08
1555 not 04-06 at 02:00; and there was no DST in 1920.
1557 Africa/Accra is now assumed to have observed DST from 1920 through 1935.
1559 Time in Russia before 1927 or so has been corrected by a few seconds in
1560 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi,
1561 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and
1562 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0
1563 point. (Thanks to Vladimir Karpinsky for the Moscow changes.)
1565 Changes affecting data format
1567 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data.
1568 The new file's extended format allows multiple country codes per zone.
1569 The older file is still installed but is deprecated; its format is
1570 not changing and it will still be distributed for a while, but new
1571 applications should use the new file.
1573 The new file format simplifies maintenance of obscure locations.
1574 To test this, it adds coverage for the Crozet Islands and the
1575 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.)
1577 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8.
1578 It is still ASCII now, but commentary about the switch has been added.
1579 The new file 'zone1970.tab' already uses UTF-8.
1581 Changes affecting code
1583 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE
1584 is defined. (Thanks to Elliott Hughes for reporting the problem.)
1586 'zic' no longer mishandles input when ignoring case in locales that
1587 are not compatible with English, e.g., unibyte Turkish locales when
1588 compiled with HAVE_GETTEXT.
1590 Error diagnostics of 'zic' and 'yearistype' have been reworded so that
1591 they no longer use ASCII '-' as if it were a dash.
1593 'zic' now rejects output file names that contain '.' or '..' components.
1594 (Thanks to Tim Parenti for reporting the problem.)
1596 'zic -v' now warns about output file names that do not follow
1597 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur
1598 David Olson for starting the ball rolling on this.)
1600 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0.
1602 Changes affecting build procedure
1604 'zic' no longer links in localtime.o and asctime.o, as they're not needed.
1605 (Thanks to John Cochran.)
1607 Changes affecting documentation and commentary
1609 The 'Theory' file documents legacy names, the longstanding
1610 exceptions to the POSIX-inspired file name rules.
1612 The 'zic' documentation clarifies the role of time types when
1613 interpreting dates. (Thanks to Arthur David Olson.)
1615 Documentation and commentary now prefer UTF-8 to US-ASCII,
1616 allowing the use of proper accents in foreign words and names.
1617 Code and data have not changed because of this. (Thanks to
1618 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug
1621 Non-HTML documentation and commentary now use plain-text URLs instead of
1622 HTML insertions, and are more consistent about bracketing URLs when they
1623 are not already surrounded by white space. (Thanks to suggestions by
1626 There is new commentary about Xujiahui Observatory, the five time-zone
1627 project in China from 1918 to 1949, timekeeping in Japanese-occupied
1628 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the
1629 warlord Jin Shuren in the data.
1631 Commentary about the coverage of each Russian zone has been standardized.
1632 (Thanks to Tim Parenti).
1634 There is new commentary about contemporary timekeeping in Ethiopia.
1636 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed.
1638 There is new commentary about time in Poland in 1919.
1640 Proper credit has been given to DST inventor George Vernon Hudson.
1642 Commentary about time in Metlakatla, AK and Resolute, NU has been
1643 improved, with a new source for the former.
1645 In zone.tab, Pacific/Easter no longer mentions Salas y GĂłmez, as it
1648 Commentary about permanent Antarctic bases has been updated.
1650 Several typos have been corrected. (Thanks to Tim Parenti for
1651 contributing some of these fixes.)
1653 tz-link.htm now mentions the JavaScript libraries Moment Timezone,
1654 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up
1655 from Matt Johnson.) Also, it mentions the Go 'latlong' package.
1656 (Thanks to a heads-up from Dirkjan Ochtman.)
1658 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998
1659 have been removed. These obsolescent US Naval Observatory entries were no
1660 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.)
1663 Release 2014e - 2014-06-12 21:53:52 -0700
1665 Changes affecting near-future timestamps
1667 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00.
1668 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily
1669 switch to standard time at 24:00 the last Thursday before Ramadan, and
1670 back to DST at 00:00 the first Friday after Ramadan.
1672 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks
1673 to Milamber Space Network.) Guess that from 2015 on Morocco will
1674 temporarily switch to standard time at 03:00 the last Saturday before
1675 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan.
1677 Changes affecting past timestamps
1679 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of
1680 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo
1681 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time
1682 in 1991. (Thanks to Hank W. for reporting the problems.)
1684 Changes affecting commentary
1686 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the
1687 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and
1688 removes stale pointers to World Time Explorer and WORLDTIME.
1691 Release 2014d - 2014-05-27 21:34:40 -0700
1693 Changes affecting code
1695 zic no longer generates files containing timestamps before the Big Bang.
1696 This works around GNOME bug 730332
1697 <https://bugzilla.gnome.org/show_bug.cgi?id=730332>.
1698 (Thanks to Leonardo Chiquitto for reporting the bug, and to
1699 Arthur David Olson and James Cloos for suggesting improvements to the fix.)
1701 Changes affecting documentation
1703 tz-link.htm now mentions GNOME.
1706 Release 2014c - 2014-05-13 07:44:13 -0700
1708 Changes affecting near-future timestamps
1710 Egypt observes DST starting 2014-05-15 at 24:00.
1711 (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
1712 Details have not been announced, except that DST will not be observed
1713 during Ramadan. Guess that DST will stop during the same Ramadan dates as
1714 Morocco, and that Egypt's future spring and fall transitions will be the
1715 same as 2010 when it last observed DST, namely April's last Friday at
1716 00:00 to September's last Thursday at 23:00 standard time. Also, guess
1717 that Ramadan transitions will be at 00:00 standard time.
1719 Changes affecting code
1721 zic now generates transitions for minimum time values, eliminating guesswork
1722 when handling low-valued timestamps. (Thanks to Arthur David Olson.)
1724 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.)
1726 Changes affecting commentary and documentation
1728 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.)
1731 Release 2014b - 2014-03-24 21:28:50 -0700
1733 Changes affecting near-future timestamps
1735 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time.
1736 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU.
1738 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and
1739 Bengt-Inge Larsson.) This is currently an approximation; a better version
1740 will require the zic and localtime fixes mentioned below, and the plan is
1741 to wait for a while until at least the zic fixes propagate.
1743 Changes affecting code
1745 'zic' and 'localtime' no longer reject locations needing four transitions
1746 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).)
1747 Also, 'zic' avoids some unlikely failures due to integer overflow.
1749 Changes affecting build procedure
1751 'make check' now detects Rule lines defined but never used.
1752 The NZAQ rules, an instance of this problem, have been removed.
1754 Changes affecting commentary and documentation
1756 Fix Tuesday/Thursday typo in description of time in Israel.
1757 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.)
1759 Microsoft Windows 8.1 doesn't support tz database names. (Thanks
1760 to Donald MacQueen.) Instead, the Microsoft Windows Store app
1761 library supports them.
1763 Add comments about Johnston Island time in the 1960s.
1764 (Thanks to Lyle McElhaney.)
1766 Morocco's 2014 DST start will be as predicted.
1767 (Thanks to Sebastien Willemijns.)
1770 Release 2014a - 2014-03-07 23:30:29 -0800
1772 Changes affecting near-future timestamps
1774 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for
1775 the heads-up, and to Tim Parenti for simplifying the update.)
1777 Changes affecting past timestamps
1779 Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00.
1780 (Thanks to Steffen Thorsen.)
1782 Ukraine switched from Moscow to Eastern European time on 1990-07-01
1783 (not 1992-01-01), and observed DST during the entire next winter.
1784 (Thanks to Vladimir in Moscow via Alois Treindl.)
1786 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03.
1787 (Thanks to Avigdor Finkelstein.)
1789 Changes affecting code
1791 A uninitialized-storage bug in 'localtime' has been fixed.
1792 (Thanks to Logan Chien.)
1794 Changes affecting the build procedure
1796 The settings for 'make check_web' now default to Ubuntu 13.10.
1798 Changes affecting commentary and documentation
1800 The boundary of the US Pacific time zone is given more accurately.
1801 (Thanks to Alan Mintz.)
1803 Chile's 2014 DST will be as predicted. (Thanks to José Miguel Garrido.)
1805 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos RaĂşl Perasso.)
1807 Better descriptions of countries with same time zone history as
1808 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.)
1810 Several changes affect tz-link.htm, the main web page.
1812 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to
1815 Mention xCal (Internet RFC 6321) and jCal.
1817 Microsoft has some support for tz database names.
1819 CLDR data formats include both XML and JSON.
1821 Mention Maggiolo's map of solar vs standard time.
1822 (Thanks to Arthur David Olson.)
1824 Mention TZ4Net. (Thanks to Matt Johnson.)
1826 Mention the timezone-olson Haskell package.
1828 Mention zeitverschiebung.net. (Thanks to Martin Jäger.)
1830 Remove moribund links to daylight-savings-time.info and to
1831 Simple Timer + Clocks.
1833 Update two links. (Thanks to Oscar van Vlijmen.)
1835 Fix some formatting glitches, e.g., remove random newlines from
1836 abbr elements' title attributes.
1839 Release 2013i - 2013-12-17 07:25:23 -0800
1841 Changes affecting near-future timestamps:
1843 Jordan switches back to standard time at 00:00 on December 20, 2013.
1844 The 2006-2011 transition schedule is planned to resume in 2014.
1845 (Thanks to Steffen Thorsen.)
1847 Changes affecting past timestamps:
1849 In 2004, Cuba began DST on March 28, not April 4.
1850 (Thanks to Steffen Thorsen.)
1852 Changes affecting code
1854 The compile-time flag NOSOLAR has been removed, as nowadays the
1855 benefit of slightly shrinking runtime table size is outweighed by the
1856 cost of disallowing potential future updates that exceed old limits.
1858 Changes affecting documentation and commentary
1860 The files solar87, solar88, and solar89 are no longer distributed.
1861 They were a negative experiment - that is, a demonstration that
1862 tz data can represent solar time only with some difficulty and error.
1863 Their presence in the distribution caused confusion, as Riyadh
1864 civil time was generally not solar time in those years.
1866 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.)
1869 Release 2013h - 2013-10-25 15:32:32 -0700
1871 Changes affecting current and future timestamps:
1873 Libya has switched its UT offset back to +02 without DST, instead
1874 of +01 with DST. (Thanks to Even Scharning.)
1876 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules.
1877 (Thanks to Gwillim Law.)
1879 Changes affecting future timestamps:
1881 Acre and (we guess) western Amazonas will switch from UT -04 to -05
1882 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe.
1883 (Thanks to Steffen Thorsen.)
1885 Add entries for DST transitions in Morocco in the year 2038.
1886 This avoids some year-2038 glitches introduced in 2013g.
1887 (Thanks to Yoshito Umaoka for reporting the problem.)
1889 Changes affecting API
1891 The 'tzselect' command no longer requires the 'select' command,
1892 and should now work with /bin/sh on more platforms. It also works
1893 around a bug in BusyBox awk before version 1.21.0. (Thanks to
1894 Patrick 'P. J.' McDermott and Alan Barrett.)
1896 Changes affecting code
1898 Fix localtime overflow bugs with 32-bit unsigned time_t.
1900 zdump no longer assumes sscanf returns maximal values on overflow.
1902 Changes affecting the build procedure
1904 The builder can specify which programs to use, if any, instead of
1905 'ar' and 'ranlib', and libtz.a is now built locally before being
1906 installed. (Thanks to Michael Forney.)
1908 A dependency typo in the 'zdump' rule has been fixed.
1909 (Thanks to Andrew Paprocki.)
1911 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f'
1912 work as specified by POSIX.2-1992 or later; this is portable nowadays.
1914 'make clean' no longer removes 'leapseconds', since it's
1915 host-independent and is part of the distribution.
1917 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed.
1919 Changes affecting documentation and commentary
1921 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol
1922 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle).
1924 Update URLs in tz-link page. Add URLs for Microsoft Windows, since
1925 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no
1926 longer maintained) and for old advisories. SOFA now does C.
1928 Release 2013g - 2013-09-30 21:08:26 -0700
1930 Changes affecting current and near-future timestamps
1932 Morocco now observes DST from the last Sunday in March to the last
1933 Sunday in October, not April to September respectively. (Thanks
1934 to Steffen Thorsen.)
1936 Changes affecting 'zic'
1938 'zic' now runs on platforms that lack both hard links and symlinks.
1939 (Thanks to Theo Veenker for reporting the problem, for MinGW.)
1940 Also, fix some bugs on platforms that lack hard links but have symlinks.
1942 'zic -v' again warns that Asia/Tehran has no POSIX environment variable
1943 to predict the far future, fixing a bug introduced in 2013e.
1945 Changes affecting the build procedure
1947 The 'leapseconds' file is again put into the tzdata tarball.
1948 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to
1949 Matt Burgess and Ian Abbott.) The timestamps of these and other
1950 dependent files in tarballs are adjusted more consistently.
1952 Changes affecting documentation and commentary
1954 The README file is now part of the data tarball as well as the code.
1955 It now states that files are public domain unless otherwise specified.
1956 (Thanks to Andrew Main (Zefram) for asking for clarifications.)
1957 Its details about the 1989 release moved to a place of honor near
1961 Release 2013f - 2013-09-24 23:37:36 -0700
1963 Changes affecting near-future timestamps
1965 Tocantins will very likely not observe DST starting this spring.
1966 (Thanks to Steffen Thorsen.)
1968 Jordan will likely stay at UT +03 indefinitely, and will not fall
1971 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.)
1973 Changes affecting API
1975 The types of the global variables 'timezone' and 'altzone' (if present)
1976 have been changed back to 'long'. This is required for 'timezone'
1977 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11.
1978 These variables were originally 'long' in the tz code, but were
1979 mistakenly changed to 'time_t' in 1987; nobody reported the
1980 incompatibility until now. The difference matters on x32, where
1981 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.)
1983 Changes affecting the build procedure
1985 Avoid long strings in leapseconds.awk to work around a mawk bug.
1986 (Thanks to Cyril Baurand.)
1988 Changes affecting documentation and commentary
1990 New file 'NEWS' that contains release notes like this one.
1992 Paraguay's law does not specify DST transition time; 00:00 is customary.
1993 (Thanks to Waldemar Villamayor-Venialbo.)
1995 Minor capitalization fixes.
1997 Changes affecting version-control only
1999 The experimental GitHub repository now contains annotated and
2000 signed tags for recent releases, e.g., '2013e' for Release 2013e.
2001 Releases are tagged starting with 2012e; earlier releases were
2002 done differently, and tags would either not have a simple name or
2003 not exactly match what was released.
2005 'make set-timestamps' is now simpler and a bit more portable.
2008 Release 2013e - 2013-09-19 23:50:04 -0700
2010 Changes affecting near-future timestamps
2012 This year Fiji will start DST on October 27, not October 20.
2013 (Thanks to David Wheeler for the heads-up.) For now, guess that
2014 Fiji will continue to spring forward the Sunday before the fourth
2017 Changes affecting current and future time zone abbreviations
2019 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian
2020 time zone abbreviations since 1932. (Thanks to George Ziegler,
2021 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and
2022 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura,
2023 Asia/Makassar, and Asia/Pontianak.
2025 Use ART (UT -03, standard time), rather than WARST (also -03, but
2026 daylight saving time) for San Luis, Argentina since 2009.
2028 Changes affecting GodthĂĄb timestamps after 2037 if version mismatch
2030 Allow POSIX-like TZ strings where the transition time's hour can
2031 range from -167 through 167, instead of the POSIX-required 0
2032 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the
2033 new Fiji rules. This is a more-compact way to represent
2034 far-future timestamps for America/Godthab, America/Santiago,
2035 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem,
2036 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by
2037 this change. (Derived from a suggestion by Arthur David Olson.)
2039 Allow POSIX-like TZ strings where daylight saving time is in
2040 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western
2041 Argentina Summer Time all year. This supports a more-compact way
2042 to represent the 2013d data for America/Argentina/San_Luis.
2043 Because of the change for San Luis noted above this change does not
2044 affect the current data. (Thanks to Andrew Main (Zefram) for
2045 suggestions that improved this change.)
2047 Where these two TZ changes take effect, there is a minor extension
2048 to the tz file format in that it allows new values for the
2049 embedded TZ-format string, and the tz file format version number
2050 has therefore been increased from 2 to 3 as a precaution.
2051 Version-2-based client code should continue to work as before for
2052 all timestamps before 2038. Existing version-2-based client code
2053 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format
2054 files, and typically works in practice even for timestamps after
2055 2037; the only known exception is America/Godthab.
2057 Changes affecting timestamps before 1970
2059 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects
2060 some errors before 1947.
2062 Some zones have been turned into links, when they differ from existing
2063 zones only in older data entries that were likely invented or that
2064 differ only in LMT or transitions from LMT. These changes affect
2065 only timestamps before 1943. The affected zones are:
2066 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica,
2067 America/Grenada, America/Guadeloupe, America/Marigot,
2068 America/Montserrat, America/St_Barthelemy, America/St_Kitts,
2069 America/St_Lucia, America/St_Thomas, America/St_Vincent,
2070 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for
2071 confirming that the old Europe/Vaduz zone was wrong and the new
2072 link is better for WWII-era times.)
2074 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects
2075 America/Cayman, America/Jamaica and America/Grand_Turk timestamps
2078 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46.
2079 This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks
2082 Change the date of the circa-1850 Zurich transition from 1849-09-12
2083 to 1853-07-16, overriding Shanks with data from Messerli about
2084 postal and telegraph time in Switzerland.
2086 Changes affecting time zone abbreviations before 1970
2088 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932,
2089 as Jakarta was called Batavia back then.
2091 Changes affecting API
2093 The 'zic' command now outputs a dummy transition when far-future
2094 data can't be summarized using a TZ string, and uses a 402-year
2095 window rather than a 400-year window. For the current data, this
2096 affects only the Asia/Tehran file. It does not affect any of the
2097 timestamps that this file represents, so zdump outputs the same
2098 information as before. (Thanks to Andrew Main (Zefram).)
2100 The 'date' command has a new '-r' option, which lets you specify
2101 the integer time to display, a la FreeBSD.
2103 The 'tzselect' command has two new options '-c' and '-n', which lets you
2104 select a zone based on latitude and longitude.
2106 The 'zic' command's '-v' option now warns about constructs that
2107 require the new version-3 binary file format. (Thanks to Arthur
2108 David Olson for the suggestion.)
2110 Support for floating-point time_t has been removed.
2111 It was always dicey, and POSIX no longer requires it.
2112 (Thanks to Eric Blake for suggesting to the POSIX committee to
2113 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy
2114 Heninger, Arthur David Olson, and Alois Treindl, for reporting
2115 bugs and elucidating some of the corners of the old floating-point
2118 The signatures of 'offtime', 'timeoff', and 'gtime' have been
2119 changed back to the old practice of using 'long' to represent UT
2120 offsets. This had been inadvertently and mistakenly changed to
2121 'int_fast32_t'. (Thanks to Christos Zoulas.)
2123 The code avoids undefined behavior on integer overflow in some
2124 more places, including gmtime, localtime, mktime and zdump.
2126 Changes affecting the zdump utility
2128 zdump now outputs "UT" when referring to Universal Time, not "UTC".
2129 "UTC" does not make sense for timestamps that predate the introduction
2130 of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen
2131 for clarifying UT vs UTC.)
2133 Data changes affecting behavior of tzselect and similar programs
2135 Country code BQ is now called the more-common name "Caribbean Netherlands"
2136 rather than the more-official "Bonaire, St Eustatius & Saba".
2138 Remove from zone.tab the names America/Montreal, America/Shiprock,
2139 and Antarctica/South_Pole, as they are equivalent to existing
2140 same-country-code zones for post-1970 timestamps. The data entries for
2141 these names are unchanged, so the names continue to work as before.
2143 Changes affecting code internals
2145 zic -c now runs way faster on 64-bit hosts when given large numbers.
2147 zic now uses vfprintf to avoid allocating and freeing some memory.
2149 tzselect now computes the list of continents from the data,
2150 rather than have it hard-coded.
2152 Minor changes pacify GCC 4.7.3 and GCC 4.8.1.
2154 Changes affecting the build procedure
2156 The 'leapseconds' file is now generated automatically from a
2157 new file 'leap-seconds.list', which is a copy of
2158 <ftp://ftp.nist.gov/pub/time/leap-seconds.list>
2159 A new source file 'leapseconds.awk' implements this.
2160 The goal is simplification of the future maintenance of 'leapseconds'.
2162 When building the 'posix' or 'right' subdirectories, if the
2163 subdirectory would be a copy of the default subdirectory, it is
2164 now made a symbolic link if that is supported. This saves about
2165 2 MB of file system space.
2167 The links America/Shiprock and Antarctica/South_Pole have been
2168 moved to the 'backward' file. This affects only nondefault builds
2169 that omit 'backward'.
2171 Changes affecting version-control only
2173 .gitignore now ignores 'date'.
2175 Changes affecting documentation and commentary
2177 Changes to the 'tzfile' man page
2179 It now mentions that the binary file format may be extended in
2180 future versions by appending data.
2182 It now refers to the 'zdump' and 'zic' man pages.
2184 Changes to the 'zic' man page
2186 It lists conditions that elicit a warning with '-v'.
2188 It says that the behavior is unspecified when duplicate names
2189 are given, or if the source of one link is the target of another.
2191 Its examples are updated to match the latest data.
2193 The definition of white space has been clarified slightly.
2194 (Thanks to Michael Deckers.)
2196 Changes to the 'Theory' file
2198 There is a new section about the accuracy of the tz database,
2199 describing the many ways that errors can creep in, and
2200 explaining why so many of the pre-1970 timestamps are wrong or
2201 misleading (thanks to Steve Allen, Lester Caine, and Garrett
2202 Wollman for discussions that contributed to this).
2204 The 'Theory' file describes LMT better (this follows a
2205 suggestion by Guy Harris).
2207 It refers to the 2013 edition of POSIX rather than the 2004 edition.
2209 It's mentioned that excluding 'backward' should not affect the
2210 other data, and it suggests at least one zone.tab name per
2211 inhabited country (thanks to Stephen Colebourne).
2213 Some longstanding restrictions on names are documented, e.g.,
2214 'America/New_York' precludes 'America/New_York/Bronx'.
2216 It gives more reasons for the 1970 cutoff.
2218 It now mentions which time_t variants are supported, such as
2219 signed integer time_t. (Thanks to Paul Goyette for reporting
2220 typos in an experimental version of this change.)
2222 (Thanks to Philip Newton for correcting typos in these changes.)
2224 Documentation and commentary is more careful to distinguish UT in
2225 general from UTC in particular. (Thanks to Steve Allen.)
2227 Add a better source for the Zurich 1894 transition.
2228 (Thanks to Pierre-Yves Berger.)
2230 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.)
2233 Release 2013d - 2013-07-05 07:38:01 -0700
2235 Changes affecting future timestamps:
2237 Morocco's midsummer transitions this year are July 7 and August 10,
2238 not July 9 and August 8. (Thanks to Andrew Paprocki.)
2240 Israel now falls back on the last Sunday of October.
2241 (Thanks to Ephraim Silverberg.)
2243 Changes affecting past timestamps:
2245 Specify Jerusalem's location more precisely; this changes the pre-1880
2248 Changing affecting metadata only:
2250 Fix typos in the entries for country codes BQ and SX.
2252 Changes affecting code:
2254 Rework the code to fix a bug with handling Australia/Macquarie on
2255 32-bit hosts (thanks to Arthur David Olson).
2257 Port to platforms like NetBSD, where time_t can be wider than long.
2259 Add support for testing time_t types other than the system's.
2260 Run 'make check_time_t_alternatives' to try this out.
2261 Currently, the tests fail for unsigned time_t;
2262 this should get fixed at some point.
2264 Changes affecting documentation and commentary:
2266 Deemphasize the significance of national borders.
2268 Update the zdump man page.
2270 Remove obsolete NOID comment (thanks to Denis Excoffier).
2272 Update several URLs and comments in the web pages.
2274 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler).
2276 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka).
2279 Release 2013c - 2013-04-19 16:17:40 -0700
2281 Changes affecting current and future timestamps:
2283 Palestine observed DST starting March 29, 2013. (Thanks to
2284 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST,
2285 with the predicted rules being the last Thursday in March at 24:00
2286 to the first Friday on or after September 21 at 01:00.
2288 Assume that the recent change to Paraguay's DST rules is permanent,
2289 by moving the end of DST to the 4th Sunday in March every year.
2290 (Thanks to Carlos RaĂşl Perasso.)
2292 Changes affecting past timestamps:
2294 Fix some historical data for Palestine to agree with that of
2295 timeanddate.com, as follows:
2297 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not
2300 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not
2303 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27.
2305 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2.
2307 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01.
2309 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00.
2311 Fix times of habitation for Macquarie to agree with the Tasmania
2312 Parks & Wildlife Service history, which indicates that permanent
2313 habitation was 1899-1919 and 1948 on.
2315 Changing affecting metadata only:
2317 Macquarie Island is politically part of Australia, not Antarctica.
2318 (Thanks to Tobias Conradi.)
2320 Sort Macquarie more-consistently with other parts of Australia.
2321 (Thanks to Tim Parenti.)
2324 Release 2013b - 2013-03-10 22:33:40 -0700
2326 Changes affecting current and future timestamps:
2328 Haiti uses US daylight-saving rules this year, and presumably future years.
2329 This changes timestamps starting today. (Thanks to Steffen Thorsen.)
2331 Paraguay will end DST on March 24 this year.
2332 (Thanks to Steffen Thorsen.) For now, assume it's just this year.
2334 Morocco does not observe DST during Ramadan;
2335 try to predict Ramadan in Morocco as best we can.
2336 (Thanks to Erik Homoet for the heads-up.)
2338 Changes affecting commentary:
2340 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS.
2341 Update URL for Solaris. Mention Internet RFC 6557.
2342 Update Internet RFCs 2445->5545, 2822->5322.
2343 Switch from FTP to HTTP for Internet RFCs.
2346 Release 2013a - 2013-02-27 09:20:35 -0800
2348 Change affecting binary data format:
2350 The zone offset at the end of version-2-format zone files is now
2351 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.)
2353 Changes affecting current and future timestamps:
2355 Chile's 2013 rules, and we guess rules for 2014 and later, will be
2356 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC.
2357 (Thanks to Steffen Thorsen and Robert Elz.)
2359 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen.
2360 (Thanks to Tobias Conradi and Arthur David Olson.)
2362 Many changes affect historical timestamps before 1940.
2363 These were deduced from: Milne J. Civil time. Geogr J. 1899
2364 Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>.
2366 Changes affecting the code:
2368 Fix zic bug that mishandled Egypt's 2010 changes (this also affected
2369 the data). (Thanks to Arthur David Olson.)
2371 Fix localtime bug when time_t is unsigned and data files were generated
2372 by a signed time_t system. (Thanks to Doug Bailey for reporting and
2373 to Arthur David Olson for fixing.)
2375 Allow the email address for bug reports to be set by the packager.
2376 The default is tz@iana.org, as before. (Thanks to Joseph S. Myers.)
2378 Update HTML checking to be compatible with Ubuntu 12.10.
2380 Check that files are a safe subset of ASCII. At some point we may
2381 relax this requirement to a safe subset of UTF-8. Without the
2382 check, some non-UTF-8 encodings were leaking into the distribution.
2386 Restore a comment about copyright notices that was inadvertently deleted.
2387 (Thanks to Arthur David Olson.)
2389 Improve the commentary about which districts observe what times
2390 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson).
2392 Add web page links to tz.js.
2394 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.)
2397 Release 2012j - 2012-11-12 18:34:49 -0800
2399 Libya moved to CET this weekend, but with DST planned next year.
2400 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.)
2402 Signatures now have the extension .asc, not .sign, as that's more
2403 standard. (Thanks to Phil Pennock.)
2405 The output of 'zdump --version', and of 'zic --version', now
2406 uses a format that is more typical for --version.
2407 (Thanks to Joseph S. Myers.)
2409 The output of 'tzselect --help', 'zdump --help', and 'zic --help'
2410 now uses tz@iana.org rather than the old elsie address.
2412 zic -v now complains about abbreviations that are less than 3
2413 or more than 6 characters, as per Posix. Formerly, it checked
2414 for abbreviations that were more than 3.
2416 'make public' no longer puts its temporary directory under /tmp,
2417 and uses the just-built zic rather than the system zic.
2419 Various fixes to documentation and commentary.
2422 Release 2012i - 2012-11-03 12:57:09 -0700
2424 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.)
2426 Linker flags can now be specified via LDFLAGS.
2427 AWK now defaults to 'awk', not 'nawk'.
2428 The shell in tzselect now defaults to /bin/bash, but this can
2429 be overridden by specifying KSHELL.
2430 The main web page now mentions the unofficial GitHub repository.
2431 (Thanks to Mike Frysinger.)
2433 Tarball signatures can now be built by running 'make signatures'.
2434 There are also new makefile rules 'tarballs', 'check_public', and
2435 separate makefile rules for each tarball and signature file.
2436 A few makefile rules are now more portable to strict POSIX.
2438 The main web page now lists the canonical IANA URL.
2441 Release 2012h - 2012-10-26 22:49:10 -0700
2443 Bahia no longer has DST. (Thanks to Kelley Cook.)
2445 Tocantins has DST. (Thanks to Rodrigo Severo.)
2447 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.)
2449 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.)
2453 More C modernization, except that at Arthur David Olson's suggestion
2454 the instances of 'register' were kept.
2457 Release 2012g - 2012-10-17 20:59:45 -0700
2459 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.)
2461 Palestine fall 2012. (Thanks to Steffen Thorsen.)
2465 To attack the version-number problem, this release ships the file
2466 'Makefile' (which contains the release number) in both the tzcode and
2467 the tzdata tarballs. The two Makefiles are identical, and should be
2468 identical in any matching pair of tarballs, so it shouldn't matter
2469 which order you extract the tarballs. Perhaps we can come up with a
2470 better version-number scheme at some point; this scheme does have the
2471 virtue of not adding more files.
2474 Release 2012f - 2012-09-12 23:17:03 -0700
2476 * australasia (Pacific/Fiji): Fiji DST is October 21 through January
2477 20 this year. (Thanks to Steffen Thorsen.)
2480 Release 2012e - 2012-08-02 20:44:55 -0700
2482 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14.
2483 (Thanks to Steffen Thorsen.)
2485 * Use a single version number for both code and data.
2487 * .gitignore: New file.
2489 * Remove trailing white space.
2492 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700
2494 Changes for Morocco's timestamps, which take effect in a couple of
2495 hours, along with infrastructure changes to accommodate how the tz
2496 code and data are released on IANA.
2499 Release data2012c - 2012-03-27 12:17:25 -0400
2502 Summer time changes for Morocco (to start late April 2012)
2505 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria
2508 Haiti following US/Canada rules for 2012 (and we're assuming,
2509 for now anyway, for the future).
2512 Release 2012b - 2012-03-02 12:29:15 +0700
2514 There is just one change to tzcode2012b (compared with 2012a):
2515 the Makefile that was accidentally included with 2012a has been
2516 replaced with the version that should have been there, which is
2517 identical with the previous version (from tzcode2011i).
2519 There are just two changes in tzdata2012b compared with 2012a.
2521 Most significantly, summer time in Cuba has been delayed 3 weeks
2522 (now starts April 1 rather than March 11). Since Mar 11 (the old start
2523 date, as listed in 2012a) is just a little over a week away, this
2526 Less importantly, an excess tab in one of the changes in zone.tab
2527 in 2012a has been removed.
2530 Release 2012a - 2012-03-01 18:28:10 +0700
2532 The changes in tzcode2012a (compared to the previous version, 2011i)
2533 are entirely to the README and tz-art.htm and tz-link.htm files, if
2534 none of those concern you, you can ignore the code update. The changes
2535 reflect the changed addresses for the mailing list and the code and
2536 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile
2537 has been added to tz-link.htm).
2539 In tzdata2012a (compared to the previous release, which was 2011n)
2540 the major changes are:
2541 Chile 2011/2012 and 2012/2013 summer time date adjustments.
2542 Falkland Islands onto permanent summer time (we're assuming for the
2543 foreseeable future, though 2012 is all we're fairly certain of.)
2544 Armenia has abolished Summer Time.
2545 Tokelau jumped the International Date Line back last December
2546 (just the same as their near neighbour, Samoa).
2547 America/Creston is a new zone for a small area of British Columbia
2548 There will be a leapsecond 2012-06-30 23:59:60 UTC.
2550 Other minor changes are:
2551 Corrections to 1918 Canadian summer time end dates.
2552 Updated URL for UK time zone history (in comments)
2553 A few typos in Le Corre's list of free French place names (comments)
2556 Release data2011n - 2011-10-30 14:57:54 +0700
2558 There are three changes of note - most urgently, Cuba (America/Havana)
2559 has extended summer time by two weeks, now to end on Nov 13, rather than
2560 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic
2561 (Europe/Tiraspol) decided not to split from the rest of Moldova after
2562 all, and consequently that zone has been removed (again) and reinstated
2563 in the "backward" file as a link to Europe/Chisinau. And third, the
2564 end date for Fiji's summer time this summer was moved forward from the
2565 earlier planned Feb 26, to Jan 22.
2567 Apart from that, Moldova (MD) returns to a single entry in zone.tab
2568 (and the incorrect syntax that was in the 2011m version of that file
2569 is so fixed - it would have been fixed in a different way had this
2570 change not happened - that's the "missing" sccs version id).
2573 Release data2011m - 2011-10-24 21:42:16 +0700
2575 In particular, the typos in comments in the data (2011-11-17 should have
2576 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that
2577 Tim Parenti noted) have been fixed, and the change for Ukraine has been
2578 made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to
2579 Tim Parenti, and also Denys Gavrysh)
2581 In addition, I added Europe/Tiraspol to zone.tab.
2583 This time, all the files have new version numbers... (including the files
2584 otherwise unchanged in 2011m that were changed in 2011l but didn't get new
2585 version numbers there...)
2588 Release data2011l - 2011-10-10 11:15:43 +0700
2590 There are just 2 changes that cause different generated tzdata files from
2591 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil
2592 is included, but commented out. Compared with the diff I sent out last week,
2593 this version also includes attributions for the sources for the changes
2594 (in much the same format as ado used, but the html tags have not been
2595 checked, verified, or used in any way at all, so if there are errors there,
2596 please let me know.)
2599 Release data2011k - 2011-09-20 17:54:03 -0400
2604 Release data2011j - 2011-09-12 09:22:49 -0400
2606 (contemporary changes for Samoa; past changes for Kenya, Uganda, and
2607 Tanzania); there are also two spelling corrections to comments in
2608 the australasia file (with thanks to Christos Zoulas).
2611 Release 2011i - 2011-08-29 05:56:32 -0400
2616 Release data2011h - 2011-06-15 18:41:48 -0400
2618 Russia and Curaçao changes
2621 Release 2011g - 2011-04-25 09:07:22 -0400
2623 update the rules for Egypt to reflect its abandonment of DST this year
2626 Release 2011f - 2011-04-06 17:14:53 -0400
2631 Release 2011e - 2011-03-31 16:04:38 -0400
2633 Morocco, Chile, and tz-link changes
2636 Release 2011d - 2011-03-14 09:18:01 -0400
2638 changes that impact present-day timestamps in Cuba, Samoa, and Turkey
2641 Release 2011c - 2011-03-07 09:30:09 -0500
2643 These do affect current timestamps in Chile and Annette Island, Canada.
2646 Release 2011b - 2011-02-07 08:44:50 -0500
2651 Release 2011a - 2011-01-24 10:30:16 -0500
2656 Release data2010o - 2010-11-01 09:18:23 -0400
2658 change to the end of DST in Fiji in 2011
2661 Release 2010n - 2010-10-25 08:19:17 -0400
2666 Release 2010m - 2010-09-27 09:24:48 -0400
2668 Hong Kong, Vostok, and zic.c changes
2671 Release 2010l - 2010-08-16 06:57:25 -0400
2676 Release 2010k - 2010-07-26 10:42:27 -0400
2681 Release 2010j - 2010-05-10 09:07:48 -0400
2683 changes for BahĂa de Banderas and for version naming
2686 Release data2010i - 2010-04-16 18:50:45 -0400
2688 the end of DST in Morocco on 2010-08-08
2691 Release data2010h - 2010-04-05 09:58:56 -0400
2696 Release data2010g - 2010-03-24 11:14:53 -0400
2701 Release 2010f - 2010-03-22 09:45:46 -0400
2706 Release data2010e - 2010-03-08 14:24:27 -0500
2708 corrects the Dhaka bug found by Danvin Ruangchan
2711 Release data2010d - 2010-03-06 07:26:01 -0500
2716 Release 2010c - 2010-03-01 09:20:58 -0500
2718 changes including KRE's suggestion for earlier initialization of
2719 "goahead" and "goback" structure elements
2722 Release code2010a - 2010-02-16 10:40:04 -0500
2727 Release data2010b - 2010-01-20 12:37:01 -0500
2732 Release data2010a - 2010-01-18 08:30:04 -0500
2737 Release data2009u - 2009-12-26 08:32:28 -0500
2739 changes to DST in Bangladesh
2742 Release 2009t - 2009-12-21 13:24:27 -0500
2747 Release data2009s - 2009-11-14 10:26:32 -0500
2749 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change
2752 Release 2009r - 2009-11-09 10:10:31 -0500
2754 "antarctica" and "tz-link.htm" changes
2757 Release 2009q - 2009-11-02 09:12:40 -0500
2759 with two corrections as reported by Eric Muller and Philip Newton
2762 Release data2009p - 2009-10-23 15:05:27 -0400
2764 Argentina (including San Luis) changes (with the correction from
2768 Release data2009o - 2009-10-14 16:49:38 -0400
2770 Samoa (commentary only), Pakistan, and Bangladesh changes
2773 Release data2009n - 2009-09-22 15:13:38 -0400
2775 added commentary for Argentina and a change to the end of DST in
2779 Release data2009m - 2009-09-03 10:23:43 -0400
2781 Samoa and Palestine changes
2784 Release data2009l - 2009-08-14 09:13:07 -0400
2786 Samoa (comments only) and Egypt
2789 Release 2009k - 2009-07-20 09:46:08 -0400
2794 Release data2009j - 2009-06-15 06:43:59 -0400
2796 Bangladesh change (with a short turnaround since the DST change is
2800 Release 2009i - 2009-06-08 09:21:22 -0400
2802 updating for DST in Bangladesh this year
2805 Release 2009h - 2009-05-26 09:19:14 -0400
2810 Release data2009g - 2009-04-20 16:34:07 -0400
2815 Release data2009f - 2009-04-10 11:00:52 -0400
2817 correct DST in Pakistan
2820 Release 2009e - 2009-04-06 09:08:11 -0400
2825 Release 2009d - 2009-03-23 09:38:12 -0400
2827 Morocco, Tunisia, Argentina, and American Astronomical Society changes
2830 Release data2009c - 2009-03-16 09:47:51 -0400
2832 change to the start of Cuban DST
2835 Release 2009b - 2009-02-09 11:15:22 -0500
2840 Release 2009a - 2009-01-21 10:09:39 -0500
2845 Release data2008i - 2008-10-21 12:10:25 -0400
2847 southamerica and zone.tab files, with Argentina DST rule changes and
2848 United States zone reordering and recommenting
2851 Release 2008h - 2008-10-13 07:33:56 -0400
2856 Release 2008g - 2008-10-06 09:03:18 -0400
2858 Fix a broken HTML anchor and update Brazil's DST transitions;
2859 there's also a slight reordering of information in tz-art.htm.
2862 Release data2008f - 2008-09-09 22:33:26 -0400
2867 Release 2008e - 2008-07-28 14:11:17 -0400
2869 changes by Arthur David Olson and Jesper Nørgaard Welen
2872 Release data2008d - 2008-07-07 09:51:38 -0400
2874 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo
2877 Release data2008c - 2008-05-19 17:48:03 -0400
2879 Pakistan, Morocco, and Mongolia
2882 Release data2008b - 2008-03-24 08:30:59 -0400
2884 including renaming Asia/Calcutta to Asia/Kolkata, with a backward
2888 Release 2008a - 2008-03-08 05:42:16 -0500
2893 Release 2007k - 2007-12-31 10:25:22 -0500
2895 most importantly, changes to the "southamerica" file based on
2896 Argentina's readoption of daylight saving time
2899 Release 2007j - 2007-12-03 09:51:01 -0500
2901 1. eliminate the "P" (parameter) macro;
2903 2. the "noncontroversial" changes circulated on the time zone
2904 mailing list (less the changes to "logwtmp.c");
2906 3. eliminate "too many transition" errors when "min" is used in time
2909 4. changes by Paul Eggert (including updated information for Venezuela).
2912 Release data2007i - 2007-10-30 10:28:11 -0400
2914 changes for Cuba and Syria
2917 Release 2007h - 2007-10-01 10:05:51 -0400
2919 changes by Paul Eggert, as well as an updated link to the ICU
2920 project in tz-link.htm
2923 Release 2007g - 2007-08-20 10:47:59 -0400
2925 changes by Paul Eggert
2927 The "leapseconds" file has been updated to incorporate the most
2928 recent International Earth Rotation and Reference Systems Service
2931 There's an addition to tz-art.htm regarding the television show "Medium".
2934 Release 2007f - 2007-05-07 10:46:46 -0400
2936 changes by Paul Eggert (including Haiti, Turks and Caicos, and New
2939 changes to zic.c to allow hour values greater than 24 (along with
2940 Paul's improved time value overflow checking)
2943 Release 2007e - 2007-04-02 10:11:52 -0400
2945 Syria and Honduras changes by Paul Eggert
2947 zic.c variable renaming changes by Arthur David Olson
2950 Release 2007d - 2007-03-20 08:48:30 -0400
2952 changes by Paul Eggert
2954 the elimination of white space at the ends of lines
2957 Release 2007c - 2007-02-26 09:09:37 -0500
2959 changes by Paul Eggert
2962 Release 2007b - 2007-02-12 09:34:20 -0500
2964 Paul Eggert's proposed change to the quotation handling logic in zic.c.
2966 changes to the commentary in "leapseconds" reflecting the IERS
2967 announcement that there is to be no positive leap second at the end
2971 Release 2007a - 2007-01-08 12:28:29 -0500
2973 changes by Paul Eggert
2975 Derick Rethan's Asmara change
2977 Oscar van Vlijmen's Easter Island local mean time change
2979 symbolic link changes
2982 Release 2006p - 2006-11-27 08:54:27 -0500
2984 changes by Paul Eggert
2987 Release 2006o - 2006-11-06 09:18:07 -0500
2989 changes by Paul Eggert
2992 Release 2006n - 2006-10-10 11:32:06 -0400
2994 changes by Paul Eggert
2997 Release 2006m - 2006-10-02 15:32:35 -0400
2999 changes for Uruguay, Palestine, and Egypt by Paul Eggert
3001 (minimalist) changes to zic.8 to clarify "until" information
3004 Release data2006l - 2006-09-18 12:58:11 -0400
3006 Paul's best-effort work on this coming weekend's Egypt time change
3009 Release 2006k - 2006-08-28 12:19:09 -0400
3011 changes by Paul Eggert
3014 Release 2006j - 2006-08-21 09:56:32 -0400
3016 changes by Paul Eggert
3019 Release code2006i - 2006-08-07 12:30:55 -0400
3023 Ken Pizzini's conversion script
3026 Release code2006h - 2006-07-24 09:19:37 -0400
3028 adds public domain notices to four files
3030 includes a fix for transition times being off by a second
3032 adds a new recording to the "arts" file (information courtesy Colin Bowern)
3035 Release 2006g - 2006-05-08 17:18:09 -0400
3037 northamerica changes by Paul Eggert
3040 Release 2006f - 2006-05-01 11:46:00 -0400
3042 a missing version number problem is fixed (with thanks to Bradley
3043 White for catching the problem)
3046 Release 2006d - 2006-04-17 14:33:43 -0400
3048 changes by Paul Eggert
3050 added new items to tz-arts.htm that were found by Paul
3053 Release 2006c - 2006-04-03 10:09:32 -0400
3055 two sets of data changes by Paul Eggert
3057 a fencepost error fix in zic.c
3059 changes to zic.c and the "europe" file to minimize differences
3060 between output produced by the old 32-bit zic and the new 64-bit
3064 Release 2006b - 2006-02-20 10:08:18 -0500
3065 [tz32code2006b + tz64code2006b + tzdata2006b]
3069 All SCCS IDs were bumped to "8.1" for this release.
3072 Release 2006a - 2006-01-30 08:59:31 -0500
3074 changes by Paul Eggert (in particular, Indiana time zone moves)
3076 an addition to the zic manual page to describe how special-case
3077 transitions are handled
3080 Release 2005r - 2005-12-27 09:27:13 -0500
3082 Canadian changes by Paul Eggert
3084 They also add "<pre>" directives to time zone data files and reflect
3085 changes to warning message logic in "zdump.c" (but with calls to
3086 "gettext" kept unbundled at the suggestion of Ken Pizzini).
3089 Release 2005q - 2005-12-13 09:17:09 -0500
3091 Nothing earth-shaking here:
3092 1. Electronic mail addresses have been removed.
3093 2. Casts of the return value of exit have been removed.
3094 3. Casts of the argument of is.* macros have been added.
3095 4. Indentation in one section of zic.c has been fixed.
3096 5. References to dead URLs in the data files have been dealt with.
3099 Release 2005p - 2005-12-05 10:30:53 -0500
3101 "systemv", "tz-link.htm", and "zdump.c" changes
3102 (less the casts of arguments to the is* macros)
3105 Release 2005o - 2005-11-28 10:55:26 -0500
3107 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert
3109 zdump.c lint fixes by Arthur David Olson
3112 Release 2005n - 2005-10-03 09:44:09 -0400
3114 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan
3118 Release 2005m - 2005-08-29 12:15:40 -0400
3120 changes by Paul Eggert (with a small tweak to the tz-art change)
3122 a declaration of an unused variable has been removed from zdump.c
3125 Release 2005l - 2005-08-22 12:06:39 -0400
3127 changes by Paul Eggert
3129 overflow/underflow checks by Arthur David Olson, minus changes to
3130 the "Theory" file about the pending addition of 64-bit data (I grow
3131 less confident of the changes being accepted with each passing day,
3132 and the changes no longer increase the data files nine-fold--there's
3133 less than a doubling in size by my local Sun's reckoning)
3136 Release 2005k - 2005-07-14 14:14:24 -0400
3138 The "leapseconds" file has been edited to reflect the recently
3139 announced leap second at the end of 2005.
3141 I've also deleted electronic mail addresses from the files as an
3145 Release 2005j - 2005-06-13 14:34:13 -0400
3147 These reflect changes to limit the length of time zone abbreviations
3148 and the characters used in those abbreviations.
3150 There are also changes to handle POSIX-style "quoted" time zone
3151 environment variables.
3153 The changes were circulated on the time zone mailing list; the only
3154 change since then was the removal of a couple of minimum-length of
3155 abbreviation checks.
3158 Release data2005i - 2005-04-21 15:04:16 -0400
3160 changes (most importantly to Nicaragua and Haiti) by Paul Eggert
3163 Release 2005h - 2005-04-04 11:24:47 -0400
3165 changes by Paul Eggert
3167 minor changes to Makefile and zdump.c to produce more useful output
3168 when doing a "make typecheck"
3171 Release 2005g - 2005-03-14 10:11:21 -0500
3173 changes by Paul Eggert (a change to current DST rules in Uruguay and
3174 an update to a link to time zone software)
3177 Release 2005f - 2005-03-01 08:45:32 -0500
3179 data and documentation changes by Paul Eggert
3182 Release 2005e - 2005-02-10 15:59:44 -0500
3187 Release code2005d - 2005-01-31 09:21:47 -0500
3189 make zic complain about links to links if the -v flag is used
3191 have "make public" do more code checking
3193 add an include to "localtime.c" for the benefit of gcc systems
3196 Release 2005c - 2005-01-17 18:36:29 -0500
3198 get better results when mktime runs on a system where time_t is double
3200 changes to the data files (most importantly to Paraguay)
3203 Release 2005b - 2005-01-10 09:19:54 -0500
3205 Get localtime and gmtime working on systems with exotic time_t types.
3207 Update the leap second commentary in the "leapseconds" file.
3210 Release 2005a - 2005-01-01 13:13:44 -0500
3215 Release code2004i - 2004-12-14 13:42:58 -0500
3217 Deal with systems where time_t is unsigned.
3220 Release code2004h - 2004-12-07 11:40:18 -0500
3222 64-bit-time_t changes
3225 Release 2004g - 2004-11-02 09:06:01 -0500
3227 update to Cuba (taking effect this weekend)
3229 other changes by Paul Eggert
3231 correction of the spelling of Oslo
3233 changed versions of difftime.c and private.h
3236 Release code2004f - 2004-10-21 10:25:22 -0400
3238 Cope with wide-ranging tm_year values.
3241 Release 2004e - 2004-10-11 14:47:21 -0400
3243 Brazil/Argentina/Israel changes by Paul Eggert
3245 changes to tz-link.htm by Paul
3247 one small fix to Makefile
3250 Release 2004d - 2004-09-22 08:27:29 -0400
3252 Avoid overflow problems when TM_YEAR_BASE is added to an integer.
3255 Release 2004c - 2004-08-11 12:06:26 -0400
3257 asctime-related changes
3259 (variants of) some of the documentation changes suggested by Paul Eggert
3262 Release 2004b - 2004-07-19 14:33:35 -0400
3264 data changes by Paul Eggert - most importantly, updates for Argentina
3267 Release 2004a - 2004-05-27 12:00:47 -0400
3269 changes by Paul Eggert
3271 Handle DST transitions that occur at the end of a month in some
3272 years but at the start of the following month in other years.
3274 Add a copy of the correspondence that's the basis for claims about
3275 DST in the Navajo Nation.
3278 Release 2003e - 2003-12-15 09:36:47 -0500
3280 changes by Arthur David Olson (primarily code changes)
3282 changes by Paul Eggert (primarily data changes)
3284 minor changes to "Makefile" and "northamerica" (in the latter case,
3285 optimization of the "Toronto" rules)
3288 Release 2003d - 2003-10-06 09:34:44 -0400
3290 changes by Paul Eggert
3293 Release 2003c - 2003-09-16 10:47:05 -0400
3295 Fix bad returns in zic.c's inleap function.
3296 Thanks to Bradley White for catching the problem!
3299 Release 2003b - 2003-09-16 07:13:44 -0400
3301 Add a "--version" option (and documentation) to the zic and zdump commands.
3303 changes to overflow/underflow checking in zic
3305 a localtime typo fix.
3307 Update the leapseconds and tz-art.htm files.
3310 Release 2003a - 2003-03-24 09:30:54 -0500
3312 changes by Paul Eggert
3314 a few additions and modifications to the tz-art.htm file
3317 Release 2002d - 2002-10-15 13:12:42 -0400
3319 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab
3321 There's also a new time zone quote in "tz-art.htm".
3324 Release 2002c - 2002-04-04 11:55:20 -0500
3326 changes by Paul Eggert
3328 Change zic.c to avoid creating symlinks to files that don't exist.
3331 Release 2002b - 2002-01-28 12:56:03 -0500
3333 [These change notes are for Release 2002a, which was corrupted.
3334 2002b was a corrected version of 2002a.]
3336 changes by Paul Eggert
3338 Update the "leapseconds" file to note that there'll be no leap
3339 second at the end of June, 2002.
3341 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone.
3343 Change to "difftime.c" to avoid sizeof problems.
3346 Release 2001d - 2001-10-09 13:31:32 -0400
3348 changes by Paul Eggert
3351 Release 2001c - 2001-06-05 13:59:55 -0400
3353 changes by Paul Eggert and Andrew Brown
3356 Release 2001b - 2001-04-05 16:44:38 -0400
3358 changes by Paul Eggert (modulo jnorgard's typo fix)
3360 tz-art.htm has been HTMLified.
3363 Release 2001a - 2001-03-13 12:57:44 -0500
3365 changes by Paul Eggert
3367 An addition to the "leapseconds" file: comments with the text of the
3368 latest IERS leap second notice.
3370 Trailing white space has been removed from data file lines, and
3371 repeated spaces in "Rule Jordan" lines in the "asia" file have been
3375 Release 2000h - 2000-12-14 15:33:38 -0500
3377 changes by Paul Eggert
3379 one typo fix in the "art" file
3381 With providence, this is the last update of the millennium.
3384 Release 2000g - 2000-10-10 11:35:22 -0400
3386 changes by Paul Eggert
3388 correction of John Mackin's name submitted by Robert Elz
3390 Garry Shandling's Daylight Saving Time joke (!?!) from the recent
3391 Emmy Awards broadcast.
3394 Release 2000f - 2000-08-10 09:31:58 -0400
3396 changes by Paul Eggert
3398 Added information in "tz-art.htm" on a Seinfeld reference to DST.
3400 Error checking and messages in the "yearistype" script have been
3404 Release 2000e - 2000-07-31 09:27:54 -0400
3406 data changes by Paul Eggert
3408 a change to the default value of the defined constant HAVE_STRERROR
3410 the addition of a Dave Barry quote on DST to the tz-arts file
3413 Release 2000d - 2000-04-20 15:43:04 -0400
3415 changes to the documentation and code of strftime for C99 conformance
3417 a bug fix for date.c
3419 These are based on (though modified from) changes by Paul Eggert.
3422 Release 2000c - 2000-03-04 10:31:43 -0500
3424 changes by Paul Eggert
3427 Release 2000b - 2000-02-21 12:16:29 -0500
3429 changes by Paul Eggert and Joseph Myers
3431 modest tweaks to the tz-art.htm and tz-link.htm files
3434 Release 2000a - 2000-01-18 09:21:26 -0500
3436 changes by Paul Eggert
3438 The two hypertext documents have also been renamed.
3441 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500
3443 Paul Eggert's changes
3445 additions to the "zic" manual page and the "Arts.htm" file
3448 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500
3453 Release data1999h - 1999-10-07 03:50:29 -0400
3455 changes by Paul Eggert to "europe" (most importantly, fixing
3456 Lithuania and Estonia)
3459 Release 1999g - 1999-09-28 11:06:18 -0400
3461 data changes by Paul Eggert (most importantly, the change for
3462 Lebanon that buys correctness for this coming Sunday)
3464 The "code" file contains changes to "Makefile" and "checktab.awk" to
3465 allow better checking of time zone files before they are published.
3468 Release 1999f - 1999-09-23 09:48:14 -0400
3470 changes by Arthur David Olson and Paul Eggert
3473 Release 1999e - 1999-08-17 15:20:54 -0400
3475 changes circulated by Paul Eggert, although the change to handling
3476 of DST-specifying time zone names has been commented out for now
3477 (search for "XXX" in "localtime.c" for details). These files also
3478 do not make any changes to the start of DST in Brazil.
3480 In addition to Paul's changes, there are updates to "Arts.htm" and
3484 Release 1999d - 1999-03-30 11:31:07 -0500
3486 changes by Paul Eggert
3488 The Makefile's "make public" rule has also been changed to do a test
3489 compile of each individual time zone data file (which should help
3490 avoid problems such as the one we had with Nicosia).
3493 Release 1999c - 1999-03-25 09:47:47 -0500
3495 changes by Paul Eggert, most importantly the change for Chile.
3498 Release 1999b - 1999-02-01 17:51:44 -0500
3500 changes by Paul Eggert
3502 code changes (suggested by Mani Varadarajan, mani at be.com) for
3503 correct handling of symbolic links when building using a relative directory
3505 code changes to generate correct messages for failed links
3507 updates to the URLs in Arts.htm
3510 Release 1999a - 1999-01-19 16:20:29 -0500
3512 error message internationalizations and corrections in zic.c and
3513 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz,
3517 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400
3519 changes for Brazil, Chile, and Germany
3521 support for use of "24:00" in the input files for the time zone compiler
3524 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400
3526 changes by Paul Eggert
3528 correction to a define in the "private.h" file
3531 Release data1998g - 1998-08-11 03:28:35 -0000
3532 [tzdata1998g.tar.gz is missing!]
3534 Lithuanian change provided by mgedmin at pub.osf.it
3536 Move creation of the GMT link with Etc/GMT to "etcetera" (from
3537 "backward") to ensure that the GMT file is created even where folks
3538 don't want the "backward" links (as suggested by Paul Eggert).
3541 Release data1998f - 1998-07-20 13:50:00 -0000
3542 [tzdata1998f.tar.gz is missing!]
3544 Update the "leapseconds" file to include the newly-announced
3545 insertion at the end of 1998.
3548 Release code1998f - 1998-06-01 10:18:31 -0400
3550 addition to localtime.c by Guy Harris
3553 Release 1998e - 1998-05-28 09:56:26 -0400
3555 The Makefile is changed to produce zoneinfo-posix rather than
3556 zoneinfo/posix, and to produce zoneinfo-leaps rather than
3559 data changes by Paul Eggert
3561 changes from Guy Harris to provide asctime_r and ctime_r
3563 A usno1998 file (substantially identical to usno1997) has been added.
3566 Release 1998d - 1998-05-14 11:58:34 -0400
3568 changes to comments (in particular, elimination of references to CIA maps).
3569 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places
3570 where changes occur.
3573 Release 1998c - 1998-02-28 12:32:26 -0500
3575 changes by Paul Eggert (save the "French correction," on which I'll
3576 wait for the dust to settle)
3580 changes and additions to Arts.htm
3583 Release 1998b - 1998-01-17 14:31:51 -0500
3585 URL cleanups and additions
3588 Release 1998a - 1998-01-13 12:37:35 -0500
3590 changes by Paul Eggert
3593 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500
3595 changes by Paul Eggert, with minor modifications from Arthur David
3596 Olson to make the files more browser friendly
3599 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500
3601 minor changes to put "TZif" at the start of each time zone information file
3603 a rule has also been added to the Makefile so you can
3605 to just recompile the zone information files (rather than doing a
3606 full "make install" with its other effects).
3609 Release data1997i - 1997-10-07 08:45:38 -0400
3611 changes to Africa by Paul Eggert
3614 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400
3616 corrections for Uruguay (and other locations)
3618 Arthur David Olson's simple-minded fix allowing mktime to both
3619 correctly handle leap seconds and correctly handle tm_sec values
3620 upon which arithmetic has been performed.
3623 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400
3625 Paul Eggert's updates
3627 a small change to a function prototype;
3629 "Music" has been renamed "Arts.htm", HTMLified, and augmented to
3630 include information on Around the World in Eighty Days.
3633 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400
3635 fixes to zic's error handling
3637 changes inspired by the item circulated on Slovenia
3639 The description of Web resources has been HTMLified for browsing
3642 A new piece of tz-related music has been added to the "Music" file.
3645 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500
3647 Paul Eggert's latest suggestions
3650 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500
3652 changes to "zic.c" to correct performance of the "-s" option
3654 a new file "usno1997"
3657 Release data1997c - 1997-03-04 09:58:18 -0500
3662 Release 1997b - 1997-02-27 18:34:19 -0500
3664 The data file incorporates the 1997 leap second.
3666 The code file incorporates Arthur David Olson's take on the
3667 zic/multiprocessor/directory-creation situation.
3670 Release 1997a - 1997-01-21 09:11:10 -0500
3672 Paul Eggert's Antarctica (and other changes)
3674 Arthur David Olson finessed the "getopt" issue by checking against
3675 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1
3676 is returned while SunOS 5.5's manual says EOF is returned).
3679 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500
3681 Paul Eggert's latest changes
3684 Release code1996n - 1996-12-16 09:42:02 -0500
3686 link snapping fix from Bruce Evans (via Garrett Wollman)
3689 Release data1996m - 1996-11-24 02:37:34 -0000
3690 [tzdata1996m.tar.gz is missing!]
3692 Paul Eggert's batch of changes
3695 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500
3697 No functional changes here; the files have simply been changed to
3698 make more use of ISO style dates in comments. The names of the above
3699 files now include the year in full.
3702 Release code96l - 1996-09-08 17:12:20 -0400
3704 tzcode96k was missing a couple of pieces.
3707 Release 96k - 1996-09-08 16:06:22 -0400
3709 the latest round of changes from Paul Eggert
3711 the recent Year 2000 material
3714 Release code96j - 1996-07-30 13:18:53 -0400
3716 Set sp->typecnt as suggested by Timothy Patrick Murphy.
3719 Release code96i - 1996-07-27 20:11:35 -0400
3721 Paul's suggested patch for strftime %V week numbers
3724 Release data96i - 1996-07-01 18:13:04 -0400
3726 "northamerica" and "europe" changes by Paul Eggert
3729 Release code96h - 1996-06-05 08:02:21 -0400
3731 fix for handling transitions specified in Universal Time
3733 Some "public domain" notices have also been added.
3736 Release code96g - 1996-05-16 14:00:26 -0400
3738 fix for the simultaneous-DST-and-zone-change challenge
3741 Release data96h - 1996-05-09 17:40:51 -0400
3743 changes by Paul Eggert
3746 Release code96f-data96g - 1996-05-03 03:09:59 -0000
3747 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!]
3749 The changes get us some of the way to fixing the problems noted in Paul
3750 Eggert's letter yesterday (in addition to a few others). The approach
3751 has been to make zic a bit smarter about figuring out what time zone
3752 abbreviations apply just after the time specified in the "UNTIL" part
3753 of a zone line. Putting the smarts in zic means avoiding having
3754 transition times show up in both "Zone" lines and "Rule" lines, which
3755 in turn avoids multiple transition time entries in time zone files.
3756 (This also makes the zic input files such as "europe" a bit shorter and
3757 should ease maintenance.)
3760 Release data96f - 1996-04-19 19:20:03 -0000
3761 [tzdata96f.tar.gz is missing!]
3763 The only changes are to the "northamerica" file; the time zone
3764 abbreviation for Denver is corrected to MST (and MDT), and the
3765 comments for Mexico have been updated.
3768 Release data96e - 1996-03-19 17:37:26 -0500
3770 Proposals by Paul Eggert, in particular the Portugal change that
3771 comes into play at the end of this month.
3774 Release data96d - 1996-03-18 20:49:39 -0500
3779 Release code96e - 1996-02-29 15:43:27 -0000
3780 [tzcode96e.tar.gz is missing!]
3782 internationalization changes and the fix to the documentation for strftime
3785 Release code96d-data96c - 1996-02-12 11:05:27 -0500
3787 The "code" file simply updates Bob Kridle's electronic address.
3789 The "data" file updates rules for Mexico.
3792 Release data96b - 1996-01-27 15:44:42 -0500
3797 Release code96c - 1996-01-16 16:58:15 -0500
3799 leap-year streamlining and binary-search changes
3804 Release code96b - 1996-01-10 20:42:39 -0500
3806 fixes and enhancements from Paul Eggert, including code that
3807 emulates the behavior of recent versions of the SunOS "date"
3811 Release 96a - 1996-01-06 09:08:24 -0500
3815 fixes to strftime.c for correct ISO 8601 week number generation,
3816 plus support for two new formats ('G' and 'g') to give ISO 8601 year
3817 numbers (which are not necessarily the same as calendar year numbers)
3820 Release code95i-data95m - 1995-12-21 12:46:47 -0500
3822 The latest revisions from Paul Eggert are included, the usno1995
3823 file has been updated, and a new file ("WWW") covering useful URLs
3827 Release code95h-data95l - 1995-12-19 18:10:12 -0500
3829 A simplification of a macro definition, a change to data for Sudan,
3830 and (for last minute shoppers) notes in the "Music" file on the CD
3834 Release code95g-data95k - 1995-10-30 10:32:47 -0500
3836 (slightly reformatted) 8-bit-clean proposed patch
3838 minor patch: US/Eastern -> America/New_York
3840 snapshot of the USNO's latest data ("usno1995")
3842 some other minor cleanups
3845 Release code95f-data95j - 1995-10-28 21:01:34 -0000
3846 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!]
3850 support for 64-bit time_t's
3852 optimization in localtime.c
3855 Release code95e - 1995-10-13 13:23:57 -0400
3857 the mktime change to scan from future to past when trying to find time zone
3861 Release data95i - 1995-09-26 10:43:26 -0400
3863 For Canada/Central, guess that the Sun customer's "one week too
3864 early" was just a approximation, and the true error is one month
3865 too early. This is consistent with the rest of Canada.
3868 Release data95h - 1995-09-21 11:26:48 -0400
3870 latest changes from Paul Eggert
3873 Release code95d - 1995-09-14 11:14:45 -0400
3875 the addition of a "Music" file, which documents four recorded
3876 versions of the tune "Save That Time".
3879 Release data95g - 1995-09-01 17:21:36 -0400
3881 "yearistype" correction
3884 Release data95f - 1995-08-28 20:46:56 -0400
3886 Paul Eggert's change to the australasia file
3889 Release data95e - 1995-07-08 18:02:34 -0400
3891 The only change is a leap second at the end of this year.
3892 Thanks to Bradley White for forwarding news on the leap second.
3895 Release data95d - 1995-07-03 13:26:22 -0400
3897 Paul Eggert's changes
3900 Release data95c - 1995-07-02 19:19:28 -0400
3902 changes to "asia", "backward", "europe", and "southamerica"
3903 (read: northamericacentrics need not apply)
3906 Release code95c - 1995-03-13 14:00:46 -0500
3908 one-line fix for sign extension problems in detzcode
3911 Release 95b - 1995-03-04 11:22:38 -0500
3913 Minor changes in both:
3915 The "code" file contains a workaround for the lack of "unistd.h" in
3916 Microsoft C++ version 7.
3918 The "data" file contains a fixed "Link" for America/Shiprock.
3921 Release 94h - 1994-12-10 12:51:14 -0500
3925 * incorporate the changes to "zdump" and "date" to make changes to
3926 the "TZ" environment variable permanent;
3928 * incorporate the table changes by Paul Eggert;
3930 * include (and document) support for universal time specifications in
3931 data files - but do not (yet) include use of this feature in the
3934 Think of this as "TZ Classic" - the software has been set up not to break if
3935 universal time shows up in its input, and data entries have been
3936 left as is so as not to break existing implementations.
3939 Release data94f - 1994-08-20 12:56:09 -0400
3941 (with thanks!) the latest data updates from Paul Eggert
3944 Release data94e - 1994-06-04 13:13:53 -0400
3949 Release code94g - 1994-05-05 12:14:07 -0400
3951 fix missing "optind.c" and a reference to it in the Makefile
3954 Release code94f - 1994-05-05 13:00:33 -0000
3955 [tzcode94f.tar.gz is missing!]
3957 changes to avoid overflow in difftime, as well as changes to cope
3958 with the 52/53 challenge in strftime
3961 Release code94e - 1994-03-30 23:32:59 -0500
3963 change for the benefit of PCTS
3966 Release 94d - 1994-02-24 15:42:25 -0500
3968 Avoid clashes with POSIX semantics for zones such as GMT+4.
3970 Some other very minor housekeeping is also present.
3973 Release code94c - 1994-02-10 08:52:40 -0500
3975 Fix bug where mkdirs was broken unless you compile with
3976 -fwritable-strings (which is generally losing to do).
3979 Release 94b - 1994-02-07 10:04:33 -0500
3981 work by Paul Eggert who notes:
3983 I found another book of time zone histories by E W Whitman; it's not
3984 as extensive as Shanks but has a few goodies of its own. I used it
3985 to update the tables. I also fixed some more as a result of
3986 correspondence with Adam David and Peter Ilieve, and move some stray
3987 links from 'europe' to 'backward'. I corrected some scanning errors
3990 As far as the code goes, I fixed zic to allow years in the range
3991 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900.
3992 And I cleaned up the zic documentation a little bit.
3995 Release data94a - 1994-02-03 08:58:54 -0500
3997 It simply incorporates the recently announced leap second into the
4001 Release 93g - 1993-11-22 17:28:27 -0500
4003 Paul Eggert has provided a good deal of historic information (based
4004 on Shanks), and there are some code changes to deal with the buglets
4005 that crawled out in dealing with the new information.
4008 Release 93f - 1993-10-15 12:27:46 -0400
4010 Paul Eggert's changes
4013 Release 93e - 1993-09-05 21:21:44 -0400
4015 This has updated data for Israel, England, and Kwajalein. There's
4016 also an update to "zdump" to cope with Kwajalein's 24-hour jump.
4017 Thanks to Paul Eggert and Peter Ilieve for the changes.
4020 Release 93d - 1993-06-17 23:34:17 -0400
4022 new fix and new data on Israel
4025 Release 93c - 1993-06-06 19:31:55 -0400
4030 Release 93b - 1993-02-02 14:53:58 -0500
4032 updated "leapseconds" file
4035 Release 93 - 1993-01-08 07:01:06 -0500
4037 At kre's suggestion, the package has been split in two - a code piece
4038 (which also includes documentation) that's only of use to folks who
4039 want to recompile things and a data piece useful to anyone who can
4042 The new version has a few changes to the data files, a few
4043 portability changes, and an off-by-one fix (with thanks to
4044 Tom Karzes at deshaw.com for providing a description and a
4048 Release 92c - 1992-11-21 17:35:36 -0000
4049 [tz92c.tar.Z is missing!]
4051 The fallout from the latest round of DST transitions.
4053 There are changes for Portugal, Saskatchewan, and "Pacific-New";
4054 there's also a change to "zic.c" that makes it portable to more systems.
4057 Release 92 - 1992-04-25 18:17:03 -0000
4058 [tz92.tar.Z is missing!]
4060 By popular demand (well, at any rate, following a request by kre at munnari)
4063 The 1989 update of the time zone package featured:
4065 * POSIXization (including interpretation of POSIX-style TZ environment
4066 variables, provided by Guy Harris),
4067 * ANSIfication (including versions of "mktime" and "difftime"),
4068 * SVIDulation (an "altzone" variable)
4069 * MACHination (the "gtime" function)
4070 * corrections to some time zone data (including corrections to the rules
4071 for Great Britain and New Zealand)
4072 * reference data from the United States Naval Observatory for folks who
4073 want to do additional time zones
4074 * and the 1989 data for Saudi Arabia.
4076 (Since this code will be treated as "part of the implementation" in some
4077 places and as "part of the application" in others, there's no good way to
4078 name functions, such as timegm, that are not part of the proposed ANSI C
4079 standard; such functions have kept their old, underscore-free names in this
4082 And the "dysize" function has disappeared; it was present to allow
4083 compilation of the "date" command on old BSD systems, and a version of "date"
4084 is now provided in the package. The "date" command is not created when you
4085 "make all" since it may lack options provided by the version distributed with
4086 your operating system, or may not interact with the system in the same way
4087 the native version does.
4089 Since POSIX frowns on correct leap second handling, the default behavior of
4090 the "zic" command (in the absence of a "-L" option) has been changed to omit
4091 leap second information from its output files.
4097 This file contains copies of the part of each release announcement
4098 that talks about the changes in that release. The text has been
4099 adapted and reformatted for the purposes of this file.
4101 Traditionally a release R consists of a pair of tarball files,
4102 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g.,
4103 code2010a, data2012c) consist of just one or the other tarball, and a
4104 few (e.g., code2012c-data2012d) have tarballs with mixed version
4105 numbers. Recent releases also come in an experimental format
4106 consisting of a single tarball tzdb-R.tar.lz with extra data.
4108 Release timestamps are taken from the release's commit (for newer,
4109 Git-based releases), from the newest file in the tarball (for older
4110 releases, where this info is available) or from the email announcing
4111 the release (if all else fails; these are marked with a time zone of
4112 -0000 and an "is missing!" comment).
4114 Earlier versions of the code and data were not announced on the tz
4115 list and are not summarized here.
4117 This file is in the public domain.