1 News for the tz database
3 Release 2016i - 2016-11-01 23:19:52 -0700
5 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga
6 reintroduces DST on 2016-11-06.
8 Changes to future time stamps
10 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on
11 2017-01-15 at 03:00. Assume future observances in Tonga will be
12 from the first Sunday in November through the third Sunday in
13 January, like Fiji. (Thanks to Pulu ʻAnau.) Switch to numeric
14 time zone abbreviations for this zone.
16 Changes to past and future time stamps
18 Northern Cyprus is now +03 year round, causing a split in Cyprus
19 time zones starting 2016-10-30 at 04:00. This creates a zone
20 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.)
22 Antarctica/Casey switched from +08 to +11 on 2016-10-22.
23 (Thanks to Steffen Thorsen.)
25 Changes to past time stamps
27 Several corrections were made for pre-1975 time stamps in Italy.
28 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and
31 First, the 1893-11-01 00:00 transition in Italy used the new UT
32 offset (+01), not the old (+00:49:56). (Thanks to Michael
35 Second, rules for daylight saving in Italy were changed to agree
36 with Italy's National Institute of Metrological Research (INRiM)
37 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian
38 Inglis, and Michael Deckers):
40 The 1916-06-03 transition was at 24:00, not 00:00.
42 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at
45 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not
48 The 1944-09-17 transition was at 03:00, not 01:00. This
49 particular change is taken from Italian law as INRiM's table,
50 (which says 02:00) appears to have a typo here. Also, keep the
51 1944-04-03 transition for Europe/Rome, as Rome was controlled by
54 The 1967-1970 and 1972-1974 fallback transitions were at 01:00,
59 The code should now be buildable on AmigaOS merely by setting the
60 appropriate Makefile variables. (From a patch by Carsten Larsen.)
63 Release 2016h - 2016-10-19 23:17:57 -0700
65 Changes to future time stamps
67 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not
68 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that
69 future fall transitions will be on the last Saturday of October
70 at 01:00, which is consistent with predicted spring transitions
71 on the last Saturday of March. (Thanks to Tim Parenti.)
73 Changes to past time stamps
75 In Turkey, transitions in 1986-1990 were at 01:00 standard time
76 not at 02:00, and the spring 1994 transition was on March 20, not
77 March 27. (Thanks to Kıvanç Yazan.)
79 Changes to past and future time zone abbreviations
81 Asia/Colombo now uses numeric time zone abbreviations like "+0530"
82 instead of alphabetic ones like "IST" and "LKT". Various
83 English-language sources use "IST", "LKT" and "SLST", with no
84 working consensus. (Usage of "SLST" mentioned by Sadika
89 zic no longer mishandles relativizing file names when creating
90 symbolic links like /etc/localtime, when these symbolic links
91 are outside the usual directory hierarchy. This fixes a bug
92 introduced in 2016g. (Problem reported by Andreas Stieger.)
94 Changes to build procedure
96 New rules 'traditional_tarballs' and 'traditional_signatures' for
97 building just the traditional-format distribution. (Requested by
100 The file 'version' is now put into the tzdata tarball too.
101 (Requested by Howard Hinnant.)
103 Changes to documentation and commentary
105 The 'Theory' file now has a section on interface stability.
106 (Requested by Paul Koning.) It also mentions features like
107 tm_zone and localtime_rz that have long been supported by the
110 tz-link.htm has improved coverage of time zone boundaries suitable
111 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt
114 The US commentary now mentions Allen and the "day of two noons".
116 The Fiji commentary mentions the government's 2016-10-03 press
117 release. (Thanks to Raymond Kumar.)
120 Release 2016g - 2016-09-13 08:56:38 -0700
122 Changes to future time stamps
124 Turkey switched from EET/EEST (+02/+03) to permanent +03,
125 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather
126 than an invented abbreviation for the new time.
128 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52.
129 (Thanks to Tim Parenti.)
131 Changes to past time stamps
133 For America/Los_Angeles, spring-forward transition times have been
134 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in
137 For zones using Soviet time on 1919-07-01, transitions to UT-based
138 time were at 00:00 UT, not at 02:00 local time. The affected
139 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and
140 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.)
142 Changes to past and future time zone abbreviations
144 The Factory zone now uses the time zone abbreviation -00 instead
145 of a long English-language string, as -00 is now the normal way to
146 represent an undefined time zone.
148 Several zones in Antarctica and the former Soviet Union, along
149 with zones intended for ships at sea that cannot use POSIX TZ
150 strings, now use numeric time zone abbreviations instead of
151 invented or obsolete alphanumeric abbreviations. The affected
152 zones are Antarctica/Casey, Antarctica/Davis,
153 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera,
154 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok,
155 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita,
156 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga,
157 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin,
158 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi,
159 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg,
160 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11,
161 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5,
162 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2,
163 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8,
164 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad,
165 Europe/Minsk, Europe/Samara, Europe/Volgograd, and
166 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM
167 was replaced by +05, whereas MSK and MSD were kept as they are not
168 our invention and are widely used.
170 Changes to zone names
172 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link.
173 (Thanks to David Massoud.)
177 zic no longer generates binary files containing POSIX TZ-like
178 strings that disagree with the local time type after the last
179 explicit transition in the data. This fixes a bug with
180 Africa/Casablanca and Africa/El_Aaiun in some year-2037 time
181 stamps on the reference platform. (Thanks to Alexander Belopolsky
182 for reporting the bug and suggesting a way forward.)
184 If the installed localtime and/or posixrules files are symbolic
185 links, zic now keeps them symbolic links when updating them, for
186 compatibility with platforms like OpenSUSE where other programs
187 configure these files as symlinks.
189 zic now avoids hard linking to symbolic links, avoids some
190 unnecessary mkdir and stat system calls, and uses shorter file
193 zdump has a new -i option to generate transitions in a
194 more-compact but still human-readable format. This option is
195 experimental, and the output format may change in future versions.
196 (Thanks to Jon Skeet for suggesting that an option was needed,
197 and thanks to Tim Parenti and Chris Rovick for further comments.)
199 Changes to build procedure
201 An experimental distribution format is available, in addition
202 to the traditional format which will continue to be distributed.
203 The new format is a tarball tzdb-VERSION.tar.lz with signature
204 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory
205 tzdb-VERSION containing the code and data of the traditional
206 two-tarball format, along with extra data that may be useful.
207 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others
208 for comments about the experimental format.)
210 The release version number is now more accurate in the usual case
211 where releases are built from a Git repository. For example, if
212 23 commits and some working-file changes have been made since
213 release 2016g, the version number is now something like
214 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'.
215 Official releases uses the same version number format as before,
216 e.g., '2016g'. To support the more-accurate version number, its
217 specification has moved from a line in the Makefile to a new
218 source file 'version'.
220 The experimental distribution contains a file to2050.tzs that
221 contains what should be the output of 'zdump -i -c 2050' on
222 primary zones. If this file is available, 'make check' now checks
223 that zdump generates this output.
225 'make check_web' now works on Fedora-like distributions.
227 Changes to documentation and commentary
229 tzfile.5 now documents the new restriction on POSIX TZ-like
230 strings that is now implemented by zic.
232 Comments now cite URLs for some 1917-1921 Russian DST decrees.
233 (Thanks to Alexander Belopolsky.)
235 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J
236 (thanks to Meno Hochschild) and ThreeTen-Extra, and its
237 description of Java 8 has been brought up to date (thanks to
238 Stephen Colebourne). Its description of local time on Mars has
239 been updated to match current practice, and URLs have been updated
240 and some obsolete ones removed.
243 Release 2016f - 2016-07-05 16:26:51 +0200
245 Changes affecting future time stamps
247 The Egyptian government changed its mind on short notice, and
248 Africa/Cairo will not introduce DST starting 2016-07-07 after all.
249 (Thanks to Mina Samuel.)
251 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00.
252 (Thanks to Stepan Golosunov.)
254 Changes to past and future time stamps
256 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone
257 abbreviations instead of invented ones.
259 Changes affecting past time stamps
261 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00.
262 (Thanks to Stepan Golosunov.)
265 Release 2016e - 2016-06-14 08:46:16 -0700
267 Changes affecting future time stamps
269 Africa/Cairo observes DST in 2016 from July 7 to the end of October.
270 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.)
271 For future years, guess April's last Thursday to October's last
272 Thursday except for Ramadan.
274 Changes affecting past time stamps
276 Locations while uninhabited now use '-00', not 'zzz', as a
277 placeholder time zone abbreviation. This is inspired by Internet
278 RFC 3339 and is more consistent with numeric time zone
279 abbreviations already used elsewhere. The change affects several
280 arctic and antarctic locations, e.g., America/Cambridge_Bay before
281 1920 and Antarctica/Troll before 2005.
283 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was
284 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.)
288 zic now outputs a dummy transition at time 2**31 - 1 in zones
289 whose POSIX-style TZ strings contain a '<'. This mostly works
290 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>.
291 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.)
293 Changes affecting documentation and commentary
295 tz-link.htm says why governments should give plenty of notice for
296 time zone or DST changes, and refers to Matt Johnson's blog post.
298 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.)
301 Release 2016d - 2016-04-17 22:50:29 -0700
303 Changes affecting future time stamps
305 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30.
306 (Thanks to Alexander Krivenyshev for the heads-up.)
308 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00.
309 (Thanks to Alexander Krivenyshev and Matt Johnson.)
311 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers
312 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29
313 at 02:00. (Thanks to Stepan Golosunov.)
315 Changes affecting past time stamps
317 New zone Europe/Kirov, split off from Europe/Volgograd. It covers
318 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on
319 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made
320 the same change. (Thanks to Stepan Golosunov.)
322 Russia and nearby locations had daylight-saving transitions on
323 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on
324 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan
327 Many corrections to historical time in Kazakhstan from 1991
328 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's
329 invented time zone abbreviations with numeric abbreviations.
331 Changes to commentary
333 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references).
336 Release 2016c - 2016-03-23 00:51:27 -0700
338 Changes affecting future time stamps
340 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.)
342 Chile reverts from permanent to seasonal DST. (Thanks to Juan
343 Correa for the heads-up, and to Tim Parenti for corrections.)
344 Guess that future transitions are August's and May's second
345 Saturdays at 24:00 mainland time. Also, call the period from
346 2014-09-07 through 2016-05-14 daylight saving time instead of
347 standard time, as that seems more appropriate now.
349 Changes affecting past time stamps
351 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to
352 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed
353 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26.
354 (Thanks to Stepan Golosunov.)
356 Changes to commentary
358 Several updates and URLs for historical and proposed Russian changes.
359 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.)
362 Release 2016b - 2016-03-12 17:30:14 -0800
366 Starting with release 2016b, some data entries cause zic implementations
367 derived from tz releases 2005j through 2015e to issue warnings like
368 "time zone abbreviation differs from POSIX standard (+03)".
369 These warnings should not otherwise affect zic's output and can safely be
370 ignored on today's platforms, as the warnings refer to a restriction in
371 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the
372 warnings is to upgrade to zic derived from tz releases 2015f and later.
374 Changes affecting future time stamps
376 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and
377 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on
378 2016-03-27 at 02:00 local time. They need distinct zones since their
379 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and
380 Altai Republic, Russia, which will switch from +06 to +07 on the same date
381 and local time. The Astrakhan change is already official; the others have
382 passed the first reading in the State Duma and are extremely likely.
383 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00.
384 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson
385 and Stepan Golosunov for followup.)
387 As a trial of a new system that needs less information to be made up,
388 the new zones use numeric time zone abbreviations like "+04"
389 instead of invented abbreviations like "ASTT".
391 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via
394 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00.
395 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last
396 Saturday at 01:00, not March's last Friday at 24:00.
398 Changes affecting past time stamps
400 Europe/Chisinau observed DST during 1990, and switched from +04 to
401 +03 at 1990-05-06 02:00, instead of switching from +03 to +02.
402 (Thanks to Stepan Golosunov.)
404 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not
405 KUYT/KUYST. (Thanks to Stepan Golosunov.)
409 tzselect's diagnostics and checking, and checktab.awk's checking,
410 have been improved. (Thanks to J William Piggott.)
412 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.)
414 tzselect now tests Julian-date TZ settings more accurately.
415 (Thanks to J William Piggott.)
417 Changes to commentary
419 Comments in zone tables have been improved. (Thanks to J William Piggott.)
421 tzselect again limits its menu comments so that menus fit on a
422 24x80 alphanumeric display.
424 A new web page tz-how-to.html. (Thanks to Bill Seymour.)
426 In the Theory file, the description of possible time zone abbreviations in
427 tzdata has been cleaned up, as the old description was unclear and
428 inconsistent. (Thanks to Alain Mouette for reporting the problem.)
431 Release 2016a - 2016-01-26 23:28:02 -0800
433 Changes affecting future time stamps
435 America/Cayman will not observe daylight saving this year after all.
436 Revert our guess that it would. (Thanks to Matt Johnson.)
438 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00.
439 (Thanks to Alexander Krivenyshev.)
441 Asia/Tehran now has DST predictions for the year 2038 and later,
442 to be March 21 00:00 to September 21 00:00. This is likely better
443 than predicting no DST, albeit off by a day every now and then.
445 Changes affecting past and future time stamps
447 America/Metlakatla switched from PST all year to AKST/AKDT on
448 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.)
450 America/Santa_Isabel has been removed, and replaced with a
451 backward compatibility link to America/Tijuana. Its contents were
452 apparently based on a misreading of Mexican legislation.
454 Changes affecting past time stamps
456 Asia/Karachi's two transition times in 2002 were off by a minute.
457 (Thanks to Matt Johnson.)
459 Changes affecting build procedure
461 An installer can now combine leap seconds with use of the backzone file,
462 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'.
463 The old 'make posix_packrat' rule is now marked as obsolescent.
464 (Thanks to Ian Abbott for an initial implementation.)
466 Changes affecting documentation and commentary
468 A new file LICENSE makes it easier to see that the code and data
469 are mostly public-domain. (Thanks to James Knight.) The three
470 non-public-domain files now use the current (3-clause) BSD license
471 instead of older versions of that license.
473 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki),
474 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section
475 on editing tz source files (with a mention of Sublime zoneinfo,
476 thanks to Gilmore Davidson).
478 The Theory and asia files now mention the 2015 book "The Global
479 Transformation of Time, 1870-1950", and cite a couple of reviews.
481 The America/Chicago entry now documents the informal use of US
482 central time in Fort Pierre, South Dakota. (Thanks to Rick
483 McDermid, Matt Johnson, and Steve Jones.)
486 Release 2015g - 2015-10-01 00:39:51 -0700
488 Changes affecting future time stamps
490 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25.
493 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time.
494 (Thanks to Alexander Krivenyshev.)
496 Fiji's 2016 fall-back transition is scheduled for January 17, not 24.
497 (Thanks to Ken Rylander.)
499 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has
500 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08.
501 New zone America/Fort_Nelson. (Thanks to Matt Johnson.)
503 Changes affecting past time stamps
505 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00.
507 Changes affecting code
509 localtime no longer mishandles America/Anchorage after 2037.
510 (Thanks to Bradley White for reporting the bug.)
512 On hosts with signed 32-bit time_t, localtime no longer mishandles
513 Pacific/Fiji after 2038-01-16 14:00 UTC.
515 The localtime module allows the variables 'timezone', 'daylight',
516 and 'altzone' to be in common storage shared with other modules,
517 and declares them in case the system <time.h> does not.
518 (Problems reported by Kees Dekker.)
520 On platforms with tm_zone, strftime.c now assumes it is not NULL.
521 This simplifies the code and is consistent with zdump.c.
522 (Problem reported by Christos Zoulas.)
524 Changes affecting documentation
526 The tzfile man page now documents that transition times denote the
527 starts (not the ends) of the corresponding time periods.
528 (Ambiguity reported by Bill Seymour.)
531 Release 2015f - 2015-08-10 18:06:56 -0700
533 Changes affecting future time stamps
535 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.)
536 The abbreviation remains "KST". (Thanks to Robert Elz.)
538 Uruguay no longer observes DST. (Thanks to Steffen Thorsen
541 Changes affecting past and future time stamps
543 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC.
544 (Thanks to Roman Tudos.)
546 Changes affecting data format and code
548 zic's '-y YEARISTYPE' option is no longer documented. The TYPE
549 field of a Rule line should now be '-'; the old values 'even',
550 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented.
551 Although the implementation has not changed, these features do not
552 work in the default installation, they are not used in the data,
553 and they are now considered obsolescent.
555 zic now checks that two rules don't take effect at the same time.
556 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on
557 simultaneity are now documented.
559 The two characters '%z' in a zone format now stand for the UTC
560 offset, e.g., '-07' for seven hours behind UTC and '+0530' for
561 five hours and thirty minutes ahead. This better supports time
562 zone abbreviations conforming to POSIX.1-2001 and later.
564 Changes affecting installed data files
566 Comments for America/Halifax and America/Glace_Bay have been improved.
567 (Thanks to Brian Inglis.)
569 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol,
570 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller
571 installed data files for Europe/Simferopol and Europe/Tallinn.
572 It does not affect timestamps. (Thanks to Howard Hinnant.)
574 Changes affecting code
576 zdump and zic no longer warn about valid time zone abbreviations
579 Some Visual Studio 2013 warnings have been suppressed.
580 (Thanks to Kees Dekker.)
582 'date' no longer sets the time of day and its -a, -d, -n and -t
583 options have been removed. Long obsolescent, the implementation
584 of these features had porting problems. Builders no longer need
585 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H.
586 (Thanks to Kees Dekker for pointing out the problem.)
588 Changes affecting documentation
590 The Theory file mentions naming issues earlier, as these seem to be
591 poorly publicized (thanks to Gilmore Davidson for reporting the problem).
593 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant).
595 Mention that Herbert Samuel introduced the term "Summer Time".
598 Release 2015e - 2015-06-13 10:56:02 -0700
600 Changes affecting future time stamps
602 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00,
603 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.)
605 Assume Cayman Islands will observe DST starting next year, using US rules.
606 Although it isn't guaranteed, it is the most likely.
608 Changes affecting data format
610 The file 'iso3166.tab' now uses UTF-8, so that its entries can better
611 spell the names of Åland Islands, Côte d'Ivoire, and Réunion.
613 Changes affecting code
615 When displaying data, tzselect converts it to the current locale's
616 encoding if the iconv command works. (Problem reported by random832.)
618 tzselect no longer mishandles Dominica, fixing a bug introduced
619 in Release 2014f. (Problem reported by Owen Leibman.)
621 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\".
622 This fixes a bug introduced in Release 2014f.
623 (Problem reported by Leonardo Chiquitto.)
626 Release 2015d - 2015-04-24 08:09:46 -0700
628 Changes affecting future time stamps
630 Egypt will not observe DST in 2015 and will consider canceling it
631 permanently. For now, assume no DST indefinitely.
632 (Thanks to Ahmed Nazmy and Tim Parenti.)
634 Changes affecting past time stamps
636 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not
637 1966-07-01. Also, Yukon's time zone history is documented better.
638 (Thanks to Brian Inglis and Dennis Ferguson.)
640 Change affecting past and future time zone abbreviations
642 The abbreviations for Hawaii-Aleutian standard and daylight times
643 have been changed from HAST/HADT to HST/HDT, as per US Government
644 Printing Office style. This affects only America/Adak since 1983,
645 as America/Honolulu was already using the new style.
647 Changes affecting code
649 zic has some minor performance improvements.
652 Release 2015c - 2015-04-11 08:55:55 -0700
654 Changes affecting future time stamps
656 Egypt's spring-forward transition is at 24:00 on April's last Thursday,
657 not 00:00 on April's last Friday. 2015's transition will therefore be on
658 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes
659 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.)
661 Changes affecting past time stamps
663 The following changes affect some pre-1991 Chile-related time stamps
664 in America/Santiago, Antarctica/Palmer, and Pacific/Easter.
666 The 1910 transition was January 10, not January 1.
668 The 1918 transition was September 10, not September 1.
670 The UT -04 time observed from 1932 to 1942 is now considered to
671 be standard time, not year-round DST.
673 Santiago observed DST (UT -03) from 1946-07-15 through
674 1946-08-31, then reverted to standard time, then switched to -05
677 Assume transitions before 1968 were at 00:00, since we have no data
680 The spring 1988 transition was 1988-10-09, not 1988-10-02.
681 The fall 1990 transition was 1990-03-11, not 1990-03-18.
683 Assume no UTC offset change for Pacific/Easter on 1890-01-01,
684 and omit all transitions on Pacific/Easter from 1942 through 1946
685 since we have no data suggesting that they existed.
687 One more zone has been turned into a link, as it differed
688 from an existing zone only for older time stamps. As usual,
689 this change affects UTC offsets in pre-1970 time stamps only.
690 The zone's old contents have been moved to the 'backzone' file.
691 The affected zone is America/Montreal.
693 Changes affecting commentary
695 Mention the TZUpdater tool.
697 Mention "The Time Now". (Thanks to Brandon Ramsey.)
700 Release 2015b - 2015-03-19 23:28:11 -0700
702 Changes affecting future time stamps
704 Mongolia will start observing DST again this year, from the last
705 Saturday in March at 02:00 to the last Saturday in September at 00:00.
706 (Thanks to Ganbold Tsagaankhuu.)
708 Palestine will start DST on March 28, not March 27. Also,
709 correct the fall 2014 transition from September 26 to October 24.
710 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.)
712 Changes affecting past time stamps
714 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a
715 regression. (Thanks to Stuart Bishop for reporting the problem.)
717 Some more zones have been turned into links, when they differed
718 from existing zones only for older time stamps. As usual,
719 these changes affect UTC offsets in pre-1970 time stamps only.
720 Their old contents have been moved to the 'backzone' file.
721 The affected zones are: America/Antigua, America/Cayman,
722 Pacific/Midway, and Pacific/Saipan.
724 Changes affecting time zone abbreviations
726 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD".
729 Changes affecting code
731 Fix integer overflow bug in reference 'mktime' implementation.
732 (Problem reported by Jörg Richter.)
734 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries
735 to be used in the same executable as standard-library time_t functions.
736 (Problems reported by Bradley White.)
738 Changes affecting commentary
740 Cite the recent Mexican decree changing Quintana Roo's time zone.
741 (Thanks to Carlos Raúl Perasso.)
743 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.)
745 Update info about Mars time.
748 Release 2015a - 2015-01-29 22:35:20 -0800
750 Changes affecting future time stamps
752 The Mexican state of Quintana Roo, represented by America/Cancun,
753 will shift from Central Time with DST to Eastern Time without DST
754 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.)
756 Chile will not change clocks in April or thereafter; its new standard time
757 will be its old daylight saving time. This affects America/Santiago,
758 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.)
760 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
761 (Thanks to Tim Parenti.)
763 Changes affecting past time stamps
765 Iceland observed DST in 1919 and 1921, and its 1939 fallback
766 transition was Oct. 29, not Nov. 29. Remove incorrect data from
767 Shanks about time in Iceland between 1837 and 1908.
769 Some more zones have been turned into links, when they differed
770 from existing zones only for older time stamps. As usual,
771 these changes affect UTC offsets in pre-1970 time stamps only.
772 Their old contents have been moved to the 'backzone' file.
773 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
776 Changes affecting code
778 tzalloc now scrubs time zone abbreviations compatibly with the way
779 that tzset always has, by replacing invalid bytes with '_' and by
780 shortening too-long abbreviations.
782 tzselect ports to POSIX awk implementations, no longer mishandles
783 POSIX TZ settings when GNU awk is used, and reports POSIX TZ
784 settings to the user. (Thanks to Stefan Kuhn.)
786 Changes affecting build procedure
788 'make check' now checks for links to links in the data.
789 One such link (for Africa/Asmera) has been fixed.
790 (Thanks to Stephen Colebourne for pointing out the problem.)
792 Changes affecting commentary
794 The leapseconds file commentary now mentions the expiration date.
795 (Problem reported by Martin Burnicki.)
797 Update Mexican Library of Congress URL.
800 Release 2014j - 2014-11-10 17:37:11 -0800
802 Changes affecting current and future time stamps
804 Turks & Caicos' switch from US eastern time to UT -04 year-round
805 did not occur on 2014-11-02 at 02:00. It's currently scheduled
806 for 2015-11-01 at 02:00. (Thanks to Chris Walton.)
808 Changes affecting past time stamps
810 Many pre-1989 time stamps have been corrected for Asia/Seoul and
811 Asia/Pyongyang, based on sources for the Korean-language Wikipedia
812 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no
813 longer guess that Pyongyang mimicked Seoul time after World War II,
814 as this is politically implausible.
816 Some more zones have been turned into links, when they differed
817 from existing zones only for older time stamps. As usual,
818 these changes affect UTC offsets in pre-1970 time stamps only.
819 Their old contents have been moved to the 'backzone' file.
820 The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
821 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
822 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and
825 Changes affecting commentary
827 The commentary is less enthusiastic about Shanks as a source,
828 and is more careful to distinguish UT from UTC.
831 Release 2014i - 2014-10-21 22:04:57 -0700
833 Changes affecting future time stamps
835 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
836 (Thanks to Ken Rylander for the heads-up.) Guess that future
837 years will use a similar pattern.
839 A new Zone Pacific/Bougainville, for the part of Papua New Guinea
840 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00.
841 (Thanks to Kiley Walbom for the heads-up.)
843 Changes affecting time zone abbreviations
845 Since Belarus is not changing its clocks even though Moscow is,
846 the time zone abbreviation in Europe/Minsk is changing from FET
847 to its more-traditional value MSK on 2014-10-26 at 01:00.
848 (Thanks to Alexander Bokovoy for the heads-up about Belarus.)
850 The new abbreviation IDT stands for the pre-1976 use of UT +08 in
851 Indochina, to distinguish it better from ICT (+07).
853 Changes affecting past time stamps
855 Many time stamps have been corrected for Asia/Ho_Chi_Minh before 1976
856 (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
857 authoritative book). Asia/Ho_Chi_Minh has been added to
858 zone1970.tab, to give tzselect users in Vietnam two choices,
859 since north and south Vietnam disagreed after our 1970 cutoff.
861 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
862 they differed from existing zones only for older time stamps. As
863 usual, these changes affect pre-1970 time stamps only. Their old
864 contents have been moved to the 'backzone' file.
866 Changes affecting code
868 The time-related library functions now set errno on failure, and
869 some crashes in the new tzalloc-related library functions have
870 been fixed. (Thanks to Christos Zoulas for reporting most of
871 these problems and for suggesting fixes.)
873 If USG_COMPAT is defined and the requested time stamp is standard time,
874 the tz library's localtime and mktime functions now set the extern
875 variable timezone to a value appropriate for that time stamp; and
876 similarly for ALTZONE, daylight saving time, and the altzone variable.
877 This change is a companion to the tzname change in 2014h, and is
878 designed to make timezone and altzone more compatible with tzname.
880 The tz library's functions now set errno to EOVERFLOW if they fail
881 because the result cannot be represented. ctime and ctime_r now
882 return NULL and set errno when a time stamp is out of range, rather
883 than having undefined behavior.
885 Some bugs associated with the new 2014g functions have been fixed.
886 This includes a bug that largely incapacitated the new functions
887 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.)
888 It also includes some uses of uninitialized variables after tzalloc.
889 The new code uses the standard type 'ssize_t', which the Makefile
890 now gives porting advice about.
892 Changes affecting commentary
894 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis).
897 Release 2014h - 2014-09-25 18:59:03 -0700
899 Changes affecting past time stamps
901 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.
903 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01,
904 not 1920-01-06. The old entry was based on a misinterpretation of Shanks.
906 Some more zones have been turned into links, when they differed
907 from existing zones only for older time stamps. As usual,
908 these changes affect UTC offsets in pre-1970 time stamps only.
909 Their old contents have been moved to the 'backzone' file.
910 The affected zones are: Africa/Blantyre, Africa/Bujumbura,
911 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
912 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane.
914 Changes affecting code
916 zdump -V and -v now output gmtoff= values on all platforms,
917 not merely on platforms defining TM_GMTOFF.
919 The tz library's localtime and mktime functions now set tzname to a value
920 appropriate for the requested time stamp, and zdump now uses this
921 on platforms not defining TM_ZONE, fixing a 2014g regression.
922 (Thanks to Tim Parenti for reporting the problem.)
924 The tz library no longer sets tzname if localtime or mktime fails.
926 zdump -c no longer mishandles transitions near year boundaries.
927 (Thanks to Tim Parenti for reporting the problem.)
929 An access to uninitialized data has been fixed.
930 (Thanks to Jörg Richter for reporting the problem.)
932 When THREAD_SAFE is defined, the code ports to the C11 memory model.
933 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined
934 and two threads race to initialize data used by gmtime-like functions.
935 (Thanks to Andy Heninger for reporting the problems.)
937 Changes affecting build procedure
939 'make check' now checks better for properly-sorted data.
941 Changes affecting documentation and commentary
943 zdump's gmtoff=N output is now documented, and its isdst=D output
944 is now documented to possibly output D values other than 0 or 1.
946 zdump -c's treatment of years is now documented to use the
947 Gregorian calendar and Universal Time without leap seconds,
948 and its behavior at cutoff boundaries is now documented better.
949 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.)
951 Programs are now documented to use the proleptic Gregorian calendar.
952 (Thanks to Alan Barrett for the suggestion.)
954 Fractional-second GMT offsets have been documented for civil time
955 in 19th-century Chennai, Jakarta, and New York.
958 Release 2014g - 2014-08-28 12:31:23 -0700
960 Changes affecting future time stamps
962 Turks & Caicos is switching from US eastern time to UT -04
963 year-round, modeled as a switch on 2014-11-02 at 02:00.
964 [As noted in 2014j, this switch was later delayed.]
966 Changes affecting past time stamps
968 Time in Russia or the USSR before 1926 or so has been corrected by
969 a few seconds in the following zones: Asia/Irkutsk,
970 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi,
971 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For
972 Asia/Yekaterinburg the correction is a few minutes. (Thanks to
975 The Portuguese decree of 1911-05-26 took effect on 1912-01-01.
976 This affects 1911 time stamps in Africa/Bissau, Africa/Luanda,
977 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912
978 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32.
979 (Thanks to Stephen Colebourne for pointing to the decree.)
981 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59.
983 A new file 'backzone' contains data which may appeal to
984 connoisseurs of old time stamps, although it is out of scope for
985 the tz database, is often poorly sourced, and contains some data
986 that is known to be incorrect. The new file is not recommended
987 for ordinary use and its entries are not installed by default.
988 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and
989 Isle of Man entries.)
991 Some more zones have been turned into links, when they differed
992 from existing zones only for older time stamps. As usual,
993 these changes affect UTC offsets in pre-1970 time stamps only.
994 Their old contents have been moved to the 'backzone' file.
995 The affected zones are: Africa/Bangui, Africa/Brazzaville,
996 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
997 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
999 Changes affecting code
1001 Unless NETBSD_INSPIRED is defined to 0, the tz library now
1002 supplies functions for creating and using objects that represent
1003 time zones. The new functions are tzalloc, tzfree, localtime_rz,
1004 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
1005 time2posix_z. They are intended for performance: for example,
1006 localtime_rz (unlike localtime_r) is trivially thread-safe without
1007 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired
1008 functions, and to Alan Barrett and Jonathan Lennox for helping to
1011 zdump now builds with the tz library unless USE_LTZ is defined to 0,
1012 This lets zdump use tz features even if the system library lacks them.
1013 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0
1014 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
1016 zdump now uses localtime_rz if available, as it's significantly faster,
1017 and it can help zdump better diagnose invalid time zone names.
1018 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ
1019 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is
1020 not available, zdump now uses localtime_r and tzset if available,
1021 as this is a bit cleaner and faster than plain localtime. Compile
1022 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
1023 lacks these two functions.
1025 If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
1026 Although not needed for tz's own applications, which are single-threaded,
1027 this supports POSIX better if the tz library is used in multithreaded apps.
1029 Some crashes have been fixed when zdump or the tz library is given
1030 invalid or outlandish input.
1032 The tz library no longer mishandles leap seconds on platforms with
1033 unsigned time_t in time zones that lack ordinary transitions after 1970.
1035 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
1036 already defined, to make it easier to configure on common platforms.
1037 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
1039 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
1040 assumes that reading uninitialized memory yields garbage values
1041 but does not cause other problems such as traps.
1043 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now
1044 more likely to guess right for ambiguous time stamps near
1045 transitions where tm_isdst does not change.
1047 If HAVE_STRFTIME_L is defined to 1, the tz library now defines
1048 strftime_l for compatibility with recent versions of POSIX.
1049 Only the C locale is supported, though. HAVE_STRFTIME_L defaults
1050 to 1 on recent POSIX versions, and to 0 otherwise.
1052 tzselect -c now uses a hybrid distance measure that works better
1053 in Africa. (Thanks to Alan Barrett for noting the problem.)
1055 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used,
1056 or when time_tz is defined.
1058 When HAVE_UTMPX_H is set the 'date' command now builds on systems
1059 whose <utmpx.h> file does not define WTMPX_FILE, and when setting
1060 the date it updates the wtmpx file if _PATH_WTMPX is defined.
1061 This affects GNU/Linux and similar systems.
1063 For easier maintenance later, some C code has been simplified,
1064 some lint has been removed, and the code has been tweaked so that
1065 plain 'make' is more likely to work.
1067 The C type 'bool' is now used for boolean values, instead of 'int'.
1069 The long-obsolete LOCALE_HOME code has been removed.
1071 The long-obsolete 'gtime' function has been removed.
1073 Changes affecting build procedure
1075 'zdump' no longer links in ialloc.o, as it's not needed.
1077 'make check_time_t_alternatives' no longer assumes GNU diff.
1079 Changes affecting distribution tarballs
1081 The files checktab.awk and zoneinfo2tdf.pl are now distributed in
1082 the tzdata tarball instead of the tzcode tarball, since they help
1083 maintain the data. The NEWS and Theory files are now also
1084 distributed in the tzdata tarball, as they're relevant for data.
1085 (Thanks to Alan Barrett for pointing this out.) Also, the
1086 leapseconds.awk file is no longer distributed in the tzcode
1087 tarball, since it belongs in the tzdata tarball (where 2014f
1088 inadvertently also distributed it).
1090 Changes affecting documentation and commentary
1092 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for
1093 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms
1096 The man pages have been updated to use function prototypes,
1097 to document thread-safe variants like localtime_r, and to document
1098 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and
1101 The fields in Link lines have been renamed to be more descriptive
1102 and more like the parameters of 'ln'. LINK-FROM has become TARGET,
1103 and LINK-TO has become LINK-NAME.
1105 tz-link.htm mentions the IETF's tzdist working group; Windows
1106 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
1108 Some broken URLs have been fixed in the commentary. (Thanks to
1111 Commentary about Philippines DST has been updated, and commentary
1112 on pre-1970 time in India has been added.
1115 Release 2014f - 2014-08-05 17:42:36 -0700
1117 Changes affecting future time stamps
1119 Russia will subtract an hour from most of its time zones on 2014-10-26
1120 at 02:00 local time. (Thanks to Alexander Krivenyshev.)
1121 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky
1122 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug
1123 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast
1124 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic
1125 (Europe/Samara) are not changing their clocks. The changed zones are
1126 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd,
1127 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk,
1128 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga,
1129 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours
1130 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected,
1131 but not its UTC offset. Two zones are added: Asia/Chita (split
1132 from Asia/Yakutsk, and also with two hours subtracted) and
1133 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour
1134 subtracted). (Thanks to Tim Parenti for much of the above.)
1136 Changes affecting time zone abbreviations
1138 Australian eastern time zone abbreviations are now AEST/AEDT not EST,
1139 and similarly for the other Australian zones. That is, for eastern
1140 standard and daylight saving time the abbreviations are AEST and AEDT
1141 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
1142 and AWST/AWDT are now used instead of the former CST, CWST, and WST.
1143 This change does not affect UTC offsets, only time zone abbreviations.
1144 (Thanks to Rich Tibbett and many others.)
1146 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07)
1147 effective 2014-10-26 at 02:00 local time.
1149 The time zone abbreviation for Xinjiang Time (observed in Ürümqi)
1150 has been changed from URUT to XJT. (Thanks to Luther Ma.)
1152 Prefer MSK/MSD for Moscow time in Russia, even in other cities.
1153 Similarly, prefer EET/EEST for eastern European time in Russia.
1155 Change time zone abbreviations in (western) Samoa to use "ST" and
1156 "DT" suffixes, as this is more likely to match common practice.
1157 Prefix "W" to (western) Samoa time when its standard-time offset
1158 disagrees with that of American Samoa.
1160 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone.
1162 Time zone abbreviations have been updated for Japan's two time
1163 zones used 1896-1937. JWST now stands for Western Standard
1164 Time, and JCST for Central Standard Time (formerly this was CJT).
1165 These abbreviations are now used for time in Korea, Taiwan,
1166 and Sakhalin while controlled by Japan.
1168 Changes affecting past time stamps
1170 China's five zones have been simplified to two, since the post-1970
1171 differences in the other three seem to have been imaginary. The
1172 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been
1173 removed; backwards-compatibility links still work, albeit with
1174 different behaviors for time stamps before May 1980. Asia/Urumqi's
1175 1980 transition to UT +08 has been removed, so that it is now at
1176 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl;
1177 Treindl sent helpful translations of two papers by Guo Qingsheng.)
1179 Some zones have been turned into links, when they differed from existing
1180 zones only for older UTC offsets where data entries were likely invented.
1181 These changes affect UTC offsets in pre-1970 time stamps only. This is
1182 similar to the change in release 2013e, except this time for western
1183 Africa. The affected zones are: Africa/Bamako, Africa/Banjul,
1184 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,
1185 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and
1186 Atlantic/St_Helena. This also affects the backwards-compatibility
1187 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne,
1188 Tim Parenti, and David Patte for reporting problems in earlier
1189 versions of this change.)
1191 Asia/Shanghai's pre-standard-time UT offset has been changed from
1192 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its
1193 transition to standard time has been changed from 1928 to 1901.
1195 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01,
1196 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945.
1197 In 1946 it observed DST from 05-15 through 09-30; in 1947
1198 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30.
1199 (Thanks to Yu-Cheng Chuang.)
1201 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950.
1203 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not
1204 10-03 at 00:00. (Thanks to Konstantin Hyppönen.)
1206 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the
1207 period from 1911 to 1950.
1209 Pacific/Chatham has been changed to New Zealand standard time plus
1210 45 minutes for the period before 1957, reflecting a 1956 remark in
1211 the New Zealand parliament.
1213 Europe/Budapest has several pre-1946 corrections: in 1918 the transition
1214 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in
1215 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08
1216 not 04-06 at 02:00; and there was no DST in 1920.
1218 Africa/Accra is now assumed to have observed DST from 1920 through 1935.
1220 Time in Russia before 1927 or so has been corrected by a few seconds in
1221 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi,
1222 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and
1223 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0
1224 point. (Thanks to Vladimir Karpinsky for the Moscow changes.)
1226 Changes affecting data format
1228 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data.
1229 The new file's extended format allows multiple country codes per zone.
1230 The older file is still installed but is deprecated; its format is
1231 not changing and it will still be distributed for a while, but new
1232 applications should use the new file.
1234 The new file format simplifies maintenance of obscure locations.
1235 To test this, it adds coverage for the Crozet Islands and the
1236 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.)
1238 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8.
1239 It is still ASCII now, but commentary about the switch has been added.
1240 The new file 'zone1970.tab' already uses UTF-8.
1242 Changes affecting code
1244 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE
1245 is defined. (Thanks to Elliott Hughes for reporting the problem.)
1247 'zic' no longer mishandles input when ignoring case in locales that
1248 are not compatible with English, e.g., unibyte Turkish locales when
1249 compiled with HAVE_GETTEXT.
1251 Error diagnostics of 'zic' and 'yearistype' have been reworded so that
1252 they no longer use ASCII '-' as if it were a dash.
1254 'zic' now rejects output file names that contain '.' or '..' components.
1255 (Thanks to Tim Parenti for reporting the problem.)
1257 'zic -v' now warns about output file names that do not follow
1258 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur
1259 David Olson for starting the ball rolling on this.)
1261 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0.
1263 Changes affecting build procedure
1265 'zic' no longer links in localtime.o and asctime.o, as they're not needed.
1266 (Thanks to John Cochran.)
1268 Changes affecting documentation and commentary
1270 The 'Theory' file documents legacy names, the longstanding
1271 exceptions to the POSIX-inspired file name rules.
1273 The 'zic' documentation clarifies the role of time types when
1274 interpreting dates. (Thanks to Arthur David Olson.)
1276 Documentation and commentary now prefer UTF-8 to US-ASCII,
1277 allowing the use of proper accents in foreign words and names.
1278 Code and data have not changed because of this. (Thanks to
1279 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug
1282 Non-HTML documentation and commentary now use plain-text URLs instead of
1283 HTML insertions, and are more consistent about bracketing URLs when they
1284 are not already surrounded by white space. (Thanks to suggestions by
1287 There is new commentary about Xujiahui Observatory, the five time-zone
1288 project in China from 1918 to 1949, timekeeping in Japanese-occupied
1289 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the
1290 warlord Jin Shuren in the data.
1292 Commentary about the coverage of each Russian zone has been standardized.
1293 (Thanks to Tim Parenti).
1295 There is new commentary about contemporary timekeeping in Ethiopia.
1297 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed.
1299 There is new commentary about time in Poland in 1919.
1301 Proper credit has been given to DST inventor George Vernon Hudson.
1303 Commentary about time in Metlakatla, AK and Resolute, NU has been
1304 improved, with a new source for the former.
1306 In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it
1309 Commentary about permanent Antarctic bases has been updated.
1311 Several typos have been corrected. (Thanks to Tim Parenti for
1312 contributing some of these fixes.)
1314 tz-link.htm now mentions the JavaScript libraries Moment Timezone,
1315 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up
1316 from Matt Johnson.) Also, it mentions the Go 'latlong' package.
1317 (Thanks to a heads-up from Dirkjan Ochtman.)
1319 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998
1320 have been removed. These obsolescent US Naval Observatory entries were no
1321 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.)
1324 Release 2014e - 2014-06-12 21:53:52 -0700
1326 Changes affecting near-future time stamps
1328 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00.
1329 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily
1330 switch to standard time at 24:00 the last Thursday before Ramadan, and
1331 back to DST at 00:00 the first Friday after Ramadan.
1333 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks
1334 to Milamber Space Network.) Guess that from 2015 on Morocco will
1335 temporarily switch to standard time at 03:00 the last Saturday before
1336 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan.
1338 Changes affecting past time stamps
1340 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of
1341 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo
1342 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time
1343 in 1991. (Thanks to Hank W. for reporting the problems.)
1345 Changes affecting commentary
1347 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the
1348 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and
1349 removes stale pointers to World Time Explorer and WORLDTIME.
1352 Release 2014d - 2014-05-27 21:34:40 -0700
1354 Changes affecting code
1356 zic no longer generates files containing time stamps before the Big Bang.
1357 This works around GNOME bug 730332
1358 <https://bugzilla.gnome.org/show_bug.cgi?id=730332>.
1359 (Thanks to Leonardo Chiquitto for reporting the bug, and to
1360 Arthur David Olson and James Cloos for suggesting improvements to the fix.)
1362 Changes affecting documentation
1364 tz-link.htm now mentions GNOME.
1367 Release 2014c - 2014-05-13 07:44:13 -0700
1369 Changes affecting near-future time stamps
1371 Egypt observes DST starting 2014-05-15 at 24:00.
1372 (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
1373 Details have not been announced, except that DST will not be observed
1374 during Ramadan. Guess that DST will stop during the same Ramadan dates as
1375 Morocco, and that Egypt's future spring and fall transitions will be the
1376 same as 2010 when it last observed DST, namely April's last Friday at
1377 00:00 to September's last Thursday at 23:00 standard time. Also, guess
1378 that Ramadan transitions will be at 00:00 standard time.
1380 Changes affecting code
1382 zic now generates transitions for minimum time values, eliminating guesswork
1383 when handling low-valued time stamps. (Thanks to Arthur David Olson.)
1385 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.)
1387 Changes affecting commentary and documentation
1389 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.)
1392 Release 2014b - 2014-03-24 21:28:50 -0700
1394 Changes affecting near-future time stamps
1396 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time.
1397 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU.
1399 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and
1400 Bengt-Inge Larsson.) This is currently an approximation; a better version
1401 will require the zic and localtime fixes mentioned below, and the plan is
1402 to wait for a while until at least the zic fixes propagate.
1404 Changes affecting code
1406 'zic' and 'localtime' no longer reject locations needing four transitions
1407 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).)
1408 Also, 'zic' avoids some unlikely failures due to integer overflow.
1410 Changes affecting build procedure
1412 'make check' now detects Rule lines defined but never used.
1413 The NZAQ rules, an instance of this problem, have been removed.
1415 Changes affecting commentary and documentation
1417 Fix Tuesday/Thursday typo in description of time in Israel.
1418 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.)
1420 Microsoft Windows 8.1 doesn't support tz database names. (Thanks
1421 to Donald MacQueen.) Instead, the Microsoft Windows Store app
1422 library supports them.
1424 Add comments about Johnston Island time in the 1960s.
1425 (Thanks to Lyle McElhaney.)
1427 Morocco's 2014 DST start will be as predicted.
1428 (Thanks to Sebastien Willemijns.)
1431 Release 2014a - 2014-03-07 23:30:29 -0800
1433 Changes affecting near-future time stamps
1435 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for
1436 the heads-up, and to Tim Parenti for simplifying the update.)
1438 Changes affecting past time stamps
1440 Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00.
1441 (Thanks to Steffen Thorsen.)
1443 Ukraine switched from Moscow to Eastern European time on 1990-07-01
1444 (not 1992-01-01), and observed DST during the entire next winter.
1445 (Thanks to Vladimir in Moscow via Alois Treindl.)
1447 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03.
1448 (Thanks to Avigdor Finkelstein.)
1450 Changes affecting code
1452 A uninitialized-storage bug in 'localtime' has been fixed.
1453 (Thanks to Logan Chien.)
1455 Changes affecting the build procedure
1457 The settings for 'make check_web' now default to Ubuntu 13.10.
1459 Changes affecting commentary and documentation
1461 The boundary of the US Pacific time zone is given more accurately.
1462 (Thanks to Alan Mintz.)
1464 Chile's 2014 DST will be as predicted. (Thanks to José Miguel Garrido.)
1466 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Raúl Perasso.)
1468 Better descriptions of countries with same time zone history as
1469 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.)
1471 Several changes affect tz-link.htm, the main web page.
1473 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to
1476 Mention xCal (Internet RFC 6321) and jCal.
1478 Microsoft has some support for tz database names.
1480 CLDR data formats include both XML and JSON.
1482 Mention Maggiolo's map of solar vs standard time.
1483 (Thanks to Arthur David Olson.)
1485 Mention TZ4Net. (Thanks to Matt Johnson.)
1487 Mention the timezone-olson Haskell package.
1489 Mention zeitverschiebung.net. (Thanks to Martin Jäger.)
1491 Remove moribund links to daylight-savings-time.info and to
1492 Simple Timer + Clocks.
1494 Update two links. (Thanks to Oscar van Vlijmen.)
1496 Fix some formatting glitches, e.g., remove random newlines from
1497 abbr elements' title attributes.
1500 Release 2013i - 2013-12-17 07:25:23 -0800
1502 Changes affecting near-future time stamps:
1504 Jordan switches back to standard time at 00:00 on December 20, 2013.
1505 The 2006-2011 transition schedule is planned to resume in 2014.
1506 (Thanks to Steffen Thorsen.)
1508 Changes affecting past time stamps:
1510 In 2004, Cuba began DST on March 28, not April 4.
1511 (Thanks to Steffen Thorsen.)
1513 Changes affecting code
1515 The compile-time flag NOSOLAR has been removed, as nowadays the
1516 benefit of slightly shrinking runtime table size is outweighed by the
1517 cost of disallowing potential future updates that exceed old limits.
1519 Changes affecting documentation and commentary
1521 The files solar87, solar88, and solar89 are no longer distributed.
1522 They were a negative experiment - that is, a demonstration that
1523 tz data can represent solar time only with some difficulty and error.
1524 Their presence in the distribution caused confusion, as Riyadh
1525 civil time was generally not solar time in those years.
1527 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.)
1530 Release 2013h - 2013-10-25 15:32:32 -0700
1532 Changes affecting current and future time stamps:
1534 Libya has switched its UT offset back to +02 without DST, instead
1535 of +01 with DST. (Thanks to Even Scharning.)
1537 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules.
1538 (Thanks to Gwillim Law.)
1540 Changes affecting future time stamps:
1542 Acre and (we guess) western Amazonas will switch from UT -04 to -05
1543 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe.
1544 (Thanks to Steffen Thorsen.)
1546 Add entries for DST transitions in Morocco in the year 2038.
1547 This avoids some year-2038 glitches introduced in 2013g.
1548 (Thanks to Yoshito Umaoka for reporting the problem.)
1550 Changes affecting API
1552 The 'tzselect' command no longer requires the 'select' command,
1553 and should now work with /bin/sh on more platforms. It also works
1554 around a bug in BusyBox awk before version 1.21.0. (Thanks to
1555 Patrick 'P. J.' McDermott and Alan Barrett.)
1557 Changes affecting code
1559 Fix localtime overflow bugs with 32-bit unsigned time_t.
1561 zdump no longer assumes sscanf returns maximal values on overflow.
1563 Changes affecting the build procedure
1565 The builder can specify which programs to use, if any, instead of
1566 'ar' and 'ranlib', and libtz.a is now built locally before being
1567 installed. (Thanks to Michael Forney.)
1569 A dependency typo in the 'zdump' rule has been fixed.
1570 (Thanks to Andrew Paprocki.)
1572 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f'
1573 work as specified by POSIX.2-1992 or later; this is portable nowadays.
1575 'make clean' no longer removes 'leapseconds', since it's
1576 host-independent and is part of the distribution.
1578 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed.
1580 Changes affecting documentation and commentary
1582 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol
1583 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle).
1585 Update URLs in tz-link page. Add URLs for Microsoft Windows, since
1586 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no
1587 longer maintained) and for old advisories. SOFA now does C.
1589 Release 2013g - 2013-09-30 21:08:26 -0700
1591 Changes affecting current and near-future time stamps
1593 Morocco now observes DST from the last Sunday in March to the last
1594 Sunday in October, not April to September respectively. (Thanks
1595 to Steffen Thorsen.)
1597 Changes affecting 'zic'
1599 'zic' now runs on platforms that lack both hard links and symlinks.
1600 (Thanks to Theo Veenker for reporting the problem, for MinGW.)
1601 Also, fix some bugs on platforms that lack hard links but have symlinks.
1603 'zic -v' again warns that Asia/Tehran has no POSIX environment variable
1604 to predict the far future, fixing a bug introduced in 2013e.
1606 Changes affecting the build procedure
1608 The 'leapseconds' file is again put into the tzdata tarball.
1609 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to
1610 Matt Burgess and Ian Abbott.) The timestamps of these and other
1611 dependent files in tarballs are adjusted more consistently.
1613 Changes affecting documentation and commentary
1615 The README file is now part of the data tarball as well as the code.
1616 It now states that files are public domain unless otherwise specified.
1617 (Thanks to Andrew Main (Zefram) for asking for clarifications.)
1618 Its details about the 1989 release moved to a place of honor near
1622 Release 2013f - 2013-09-24 23:37:36 -0700
1624 Changes affecting near-future time stamps
1626 Tocantins will very likely not observe DST starting this spring.
1627 (Thanks to Steffen Thorsen.)
1629 Jordan will likely stay at UT +03 indefinitely, and will not fall
1632 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.)
1634 Changes affecting API
1636 The types of the global variables 'timezone' and 'altzone' (if present)
1637 have been changed back to 'long'. This is required for 'timezone'
1638 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11.
1639 These variables were originally 'long' in the tz code, but were
1640 mistakenly changed to 'time_t' in 1987; nobody reported the
1641 incompatibility until now. The difference matters on x32, where
1642 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.)
1644 Changes affecting the build procedure
1646 Avoid long strings in leapseconds.awk to work around a mawk bug.
1647 (Thanks to Cyril Baurand.)
1649 Changes affecting documentation and commentary
1651 New file 'NEWS' that contains release notes like this one.
1653 Paraguay's law does not specify DST transition time; 00:00 is customary.
1654 (Thanks to Waldemar Villamayor-Venialbo.)
1656 Minor capitalization fixes.
1658 Changes affecting version-control only
1660 The experimental GitHub repository now contains annotated and
1661 signed tags for recent releases, e.g., '2013e' for Release 2013e.
1662 Releases are tagged starting with 2012e; earlier releases were
1663 done differently, and tags would either not have a simple name or
1664 not exactly match what was released.
1666 'make set-timestamps' is now simpler and a bit more portable.
1669 Release 2013e - 2013-09-19 23:50:04 -0700
1671 Changes affecting near-future time stamps
1673 This year Fiji will start DST on October 27, not October 20.
1674 (Thanks to David Wheeler for the heads-up.) For now, guess that
1675 Fiji will continue to spring forward the Sunday before the fourth
1678 Changes affecting current and future time zone abbreviations
1680 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian
1681 time zone abbreviations since 1932. (Thanks to George Ziegler,
1682 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and
1683 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura,
1684 Asia/Makassar, and Asia/Pontianak.
1686 Use ART (UT -03, standard time), rather than WARST (also -03, but
1687 daylight saving time) for San Luis, Argentina since 2009.
1689 Changes affecting Godthåb time stamps after 2037 if version mismatch
1691 Allow POSIX-like TZ strings where the transition time's hour can
1692 range from -167 through 167, instead of the POSIX-required 0
1693 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the
1694 new Fiji rules. This is a more-compact way to represent
1695 far-future time stamps for America/Godthab, America/Santiago,
1696 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem,
1697 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by
1698 this change. (Derived from a suggestion by Arthur David Olson.)
1700 Allow POSIX-like TZ strings where daylight saving time is in
1701 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western
1702 Argentina Summer Time all year. This supports a more-compact way
1703 to represent the 2013d data for America/Argentina/San_Luis.
1704 Because of the change for San Luis noted above this change does not
1705 affect the current data. (Thanks to Andrew Main (Zefram) for
1706 suggestions that improved this change.)
1708 Where these two TZ changes take effect, there is a minor extension
1709 to the tz file format in that it allows new values for the
1710 embedded TZ-format string, and the tz file format version number
1711 has therefore been increased from 2 to 3 as a precaution.
1712 Version-2-based client code should continue to work as before for
1713 all time stamps before 2038. Existing version-2-based client code
1714 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format
1715 files, and typically works in practice even for time stamps after
1716 2037; the only known exception is America/Godthab.
1718 Changes affecting time stamps before 1970
1720 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects
1721 some errors before 1947.
1723 Some zones have been turned into links, when they differ from existing
1724 zones only in older data entries that were likely invented or that
1725 differ only in LMT or transitions from LMT. These changes affect
1726 only time stamps before 1943. The affected zones are:
1727 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica,
1728 America/Grenada, America/Guadeloupe, America/Marigot,
1729 America/Montserrat, America/St_Barthelemy, America/St_Kitts,
1730 America/St_Lucia, America/St_Thomas, America/St_Vincent,
1731 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for
1732 confirming that the old Europe/Vaduz zone was wrong and the new
1733 link is better for WWII-era times.)
1735 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects
1736 America/Cayman, America/Jamaica and America/Grand_Turk time stamps
1739 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46.
1740 This affects Europe/Zurich time stamps from 1853 to 1894. (Thanks
1743 Change the date of the circa-1850 Zurich transition from 1849-09-12
1744 to 1853-07-16, overriding Shanks with data from Messerli about
1745 postal and telegraph time in Switzerland.
1747 Changes affecting time zone abbreviations before 1970
1749 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932,
1750 as Jakarta was called Batavia back then.
1752 Changes affecting API
1754 The 'zic' command now outputs a dummy transition when far-future
1755 data can't be summarized using a TZ string, and uses a 402-year
1756 window rather than a 400-year window. For the current data, this
1757 affects only the Asia/Tehran file. It does not affect any of the
1758 time stamps that this file represents, so zdump outputs the same
1759 information as before. (Thanks to Andrew Main (Zefram).)
1761 The 'date' command has a new '-r' option, which lets you specify
1762 the integer time to display, a la FreeBSD.
1764 The 'tzselect' command has two new options '-c' and '-n', which lets you
1765 select a zone based on latitude and longitude.
1767 The 'zic' command's '-v' option now warns about constructs that
1768 require the new version-3 binary file format. (Thanks to Arthur
1769 David Olson for the suggestion.)
1771 Support for floating-point time_t has been removed.
1772 It was always dicey, and POSIX no longer requires it.
1773 (Thanks to Eric Blake for suggesting to the POSIX committee to
1774 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy
1775 Heninger, Arthur David Olson, and Alois Treindl, for reporting
1776 bugs and elucidating some of the corners of the old floating-point
1779 The signatures of 'offtime', 'timeoff', and 'gtime' have been
1780 changed back to the old practice of using 'long' to represent UT
1781 offsets. This had been inadvertently and mistakenly changed to
1782 'int_fast32_t'. (Thanks to Christos Zoulas.)
1784 The code avoids undefined behavior on integer overflow in some
1785 more places, including gmtime, localtime, mktime and zdump.
1787 Changes affecting the zdump utility
1789 zdump now outputs "UT" when referring to Universal Time, not "UTC".
1790 "UTC" does not make sense for time stamps that predate the introduction
1791 of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen
1792 for clarifying UT vs UTC.)
1794 Data changes affecting behavior of tzselect and similar programs
1796 Country code BQ is now called the more-common name "Caribbean Netherlands"
1797 rather than the more-official "Bonaire, St Eustatius & Saba".
1799 Remove from zone.tab the names America/Montreal, America/Shiprock,
1800 and Antarctica/South_Pole, as they are equivalent to existing
1801 same-country-code zones for post-1970 time stamps. The data entries for
1802 these names are unchanged, so the names continue to work as before.
1804 Changes affecting code internals
1806 zic -c now runs way faster on 64-bit hosts when given large numbers.
1808 zic now uses vfprintf to avoid allocating and freeing some memory.
1810 tzselect now computes the list of continents from the data,
1811 rather than have it hard-coded.
1813 Minor changes pacify GCC 4.7.3 and GCC 4.8.1.
1815 Changes affecting the build procedure
1817 The 'leapseconds' file is now generated automatically from a
1818 new file 'leap-seconds.list', which is a copy of
1819 <ftp://time.nist.gov/pub/leap-seconds.list>.
1820 A new source file 'leapseconds.awk' implements this.
1821 The goal is simplification of the future maintenance of 'leapseconds'.
1823 When building the 'posix' or 'right' subdirectories, if the
1824 subdirectory would be a copy of the default subdirectory, it is
1825 now made a symbolic link if that is supported. This saves about
1826 2 MB of file system space.
1828 The links America/Shiprock and Antarctica/South_Pole have been
1829 moved to the 'backward' file. This affects only nondefault builds
1830 that omit 'backward'.
1832 Changes affecting version-control only
1834 .gitignore now ignores 'date'.
1836 Changes affecting documentation and commentary
1838 Changes to the 'tzfile' man page
1840 It now mentions that the binary file format may be extended in
1841 future versions by appending data.
1843 It now refers to the 'zdump' and 'zic' man pages.
1845 Changes to the 'zic' man page
1847 It lists conditions that elicit a warning with '-v'.
1849 It says that the behavior is unspecified when duplicate names
1850 are given, or if the source of one link is the target of another.
1852 Its examples are updated to match the latest data.
1854 The definition of white space has been clarified slightly.
1855 (Thanks to Michael Deckers.)
1857 Changes to the 'Theory' file
1859 There is a new section about the accuracy of the tz database,
1860 describing the many ways that errors can creep in, and
1861 explaining why so many of the pre-1970 time stamps are wrong or
1862 misleading (thanks to Steve Allen, Lester Caine, and Garrett
1863 Wollman for discussions that contributed to this).
1865 The 'Theory' file describes LMT better (this follows a
1866 suggestion by Guy Harris).
1868 It refers to the 2013 edition of POSIX rather than the 2004 edition.
1870 It's mentioned that excluding 'backward' should not affect the
1871 other data, and it suggests at least one zone.tab name per
1872 inhabited country (thanks to Stephen Colebourne).
1874 Some longstanding restrictions on names are documented, e.g.,
1875 'America/New_York' precludes 'America/New_York/Bronx'.
1877 It gives more reasons for the 1970 cutoff.
1879 It now mentions which time_t variants are supported, such as
1880 signed integer time_t. (Thanks to Paul Goyette for reporting
1881 typos in an experimental version of this change.)
1883 (Thanks to Philip Newton for correcting typos in these changes.)
1885 Documentation and commentary is more careful to distinguish UT in
1886 general from UTC in particular. (Thanks to Steve Allen.)
1888 Add a better source for the Zurich 1894 transition.
1889 (Thanks to Pierre-Yves Berger.)
1891 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.)
1894 Release 2013d - 2013-07-05 07:38:01 -0700
1896 Changes affecting future time stamps:
1898 Morocco's midsummer transitions this year are July 7 and August 10,
1899 not July 9 and August 8. (Thanks to Andrew Paprocki.)
1901 Israel now falls back on the last Sunday of October.
1902 (Thanks to Ephraim Silverberg.)
1904 Changes affecting past time stamps:
1906 Specify Jerusalem's location more precisely; this changes the pre-1880
1909 Changing affecting metadata only:
1911 Fix typos in the entries for country codes BQ and SX.
1913 Changes affecting code:
1915 Rework the code to fix a bug with handling Australia/Macquarie on
1916 32-bit hosts (thanks to Arthur David Olson).
1918 Port to platforms like NetBSD, where time_t can be wider than long.
1920 Add support for testing time_t types other than the system's.
1921 Run 'make check_time_t_alternatives' to try this out.
1922 Currently, the tests fail for unsigned time_t;
1923 this should get fixed at some point.
1925 Changes affecting documentation and commentary:
1927 Deemphasize the significance of national borders.
1929 Update the zdump man page.
1931 Remove obsolete NOID comment (thanks to Denis Excoffier).
1933 Update several URLs and comments in the web pages.
1935 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler).
1937 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka).
1940 Release 2013c - 2013-04-19 16:17:40 -0700
1942 Changes affecting current and future time stamps:
1944 Palestine observed DST starting March 29, 2013. (Thanks to
1945 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST,
1946 with the predicted rules being the last Thursday in March at 24:00
1947 to the first Friday on or after September 21 at 01:00.
1949 Assume that the recent change to Paraguay's DST rules is permanent,
1950 by moving the end of DST to the 4th Sunday in March every year.
1951 (Thanks to Carlos Raúl Perasso.)
1953 Changes affecting past time stamps:
1955 Fix some historical data for Palestine to agree with that of
1956 timeanddate.com, as follows:
1958 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not
1961 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not
1964 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27.
1966 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2.
1968 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01.
1970 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00.
1972 Fix times of habitation for Macquarie to agree with the Tasmania
1973 Parks & Wildlife Service history, which indicates that permanent
1974 habitation was 1899-1919 and 1948 on.
1976 Changing affecting metadata only:
1978 Macquarie Island is politically part of Australia, not Antarctica.
1979 (Thanks to Tobias Conradi.)
1981 Sort Macquarie more-consistently with other parts of Australia.
1982 (Thanks to Tim Parenti.)
1985 Release 2013b - 2013-03-10 22:33:40 -0700
1987 Changes affecting current and future time stamps:
1989 Haiti uses US daylight-saving rules this year, and presumably future years.
1990 This changes time stamps starting today. (Thanks to Steffen Thorsen.)
1992 Paraguay will end DST on March 24 this year.
1993 (Thanks to Steffen Thorsen.) For now, assume it's just this year.
1995 Morocco does not observe DST during Ramadan;
1996 try to predict Ramadan in Morocco as best we can.
1997 (Thanks to Erik Homoet for the heads-up.)
1999 Changes affecting commentary:
2001 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS.
2002 Update URL for Solaris. Mention Internet RFC 6557.
2003 Update Internet RFCs 2445->5545, 2822->5322.
2004 Switch from FTP to HTTP for Internet RFCs.
2007 Release 2013a - 2013-02-27 09:20:35 -0800
2009 Change affecting binary data format:
2011 The zone offset at the end of version-2-format zone files is now
2012 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.)
2014 Changes affecting current and future time stamps:
2016 Chile's 2013 rules, and we guess rules for 2014 and later, will be
2017 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC.
2018 (Thanks to Steffen Thorsen and Robert Elz.)
2020 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen.
2021 (Thanks to Tobias Conradi and Arthur David Olson.)
2023 Many changes affect historical time stamps before 1940.
2024 These were deduced from: Milne J. Civil time. Geogr J. 1899
2025 Feb;13(2):173-94 <http://www.jstor.org/stable/1774359>.
2027 Changes affecting the code:
2029 Fix zic bug that mishandled Egypt's 2010 changes (this also affected
2030 the data). (Thanks to Arthur David Olson.)
2032 Fix localtime bug when time_t is unsigned and data files were generated
2033 by a signed time_t system. (Thanks to Doug Bailey for reporting and
2034 to Arthur David Olson for fixing.)
2036 Allow the email address for bug reports to be set by the packager.
2037 The default is tz@iana.org, as before. (Thanks to Joseph S. Myers.)
2039 Update HTML checking to be compatible with Ubuntu 12.10.
2041 Check that files are a safe subset of ASCII. At some point we may
2042 relax this requirement to a safe subset of UTF-8. Without the
2043 check, some non-UTF-8 encodings were leaking into the distribution.
2047 Restore a comment about copyright notices that was inadvertently deleted.
2048 (Thanks to Arthur David Olson.)
2050 Improve the commentary about which districts observe what times
2051 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson).
2053 Add web page links to tz.js.
2055 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.)
2058 Release 2012j - 2012-11-12 18:34:49 -0800
2060 Libya moved to CET this weekend, but with DST planned next year.
2061 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.)
2063 Signatures now have the extension .asc, not .sign, as that's more
2064 standard. (Thanks to Phil Pennock.)
2066 The output of 'zdump --version', and of 'zic --version', now
2067 uses a format that is more typical for --version.
2068 (Thanks to Joseph S. Myers.)
2070 The output of 'tzselect --help', 'zdump --help', and 'zic --help'
2071 now uses tz@iana.org rather than the old elsie address.
2073 zic -v now complains about abbreviations that are less than 3
2074 or more than 6 characters, as per Posix. Formerly, it checked
2075 for abbreviations that were more than 3.
2077 'make public' no longer puts its temporary directory under /tmp,
2078 and uses the just-built zic rather than the system zic.
2080 Various fixes to documentation and commentary.
2083 Release 2012i - 2012-11-03 12:57:09 -0700
2085 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.)
2087 Linker flags can now be specified via LDFLAGS.
2088 AWK now defaults to 'awk', not 'nawk'.
2089 The shell in tzselect now defaults to /bin/bash, but this can
2090 be overridden by specifying KSHELL.
2091 The main web page now mentions the unofficial GitHub repository.
2092 (Thanks to Mike Frysinger.)
2094 Tarball signatures can now be built by running 'make signatures'.
2095 There are also new makefile rules 'tarballs', 'check_public', and
2096 separate makefile rules for each tarball and signature file.
2097 A few makefile rules are now more portable to strict POSIX.
2099 The main web page now lists the canonical IANA URL.
2102 Release 2012h - 2012-10-26 22:49:10 -0700
2104 Bahia no longer has DST. (Thanks to Kelley Cook.)
2106 Tocantins has DST. (Thanks to Rodrigo Severo.)
2108 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.)
2110 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.)
2114 More C modernization, except that at Arthur David Olson's suggestion
2115 the instances of 'register' were kept.
2118 Release 2012g - 2012-10-17 20:59:45 -0700
2120 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.)
2122 Palestine fall 2012. (Thanks to Steffen Thorsen.)
2126 To attack the version-number problem, this release ships the file
2127 'Makefile' (which contains the release number) in both the tzcode and
2128 the tzdata tarballs. The two Makefiles are identical, and should be
2129 identical in any matching pair of tarballs, so it shouldn't matter
2130 which order you extract the tarballs. Perhaps we can come up with a
2131 better version-number scheme at some point; this scheme does have the
2132 virtue of not adding more files.
2135 Release 2012f - 2012-09-12 23:17:03 -0700
2137 * australasia (Pacific/Fiji): Fiji DST is October 21 through January
2138 20 this year. (Thanks to Steffen Thorsen.)
2141 Release 2012e - 2012-08-02 20:44:55 -0700
2143 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14.
2144 (Thanks to Steffen Thorsen.)
2146 * Use a single version number for both code and data.
2148 * .gitignore: New file.
2150 * Remove trailing white space.
2153 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700
2155 Changes for Morocco's time stamps, which take effect in a couple of
2156 hours, along with infrastructure changes to accommodate how the tz
2157 code and data are released on IANA.
2160 Release data2012c - 2012-03-27 12:17:25 -0400
2163 Summer time changes for Morocco (to start late April 2012)
2166 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria
2169 Haiti following US/Canada rules for 2012 (and we're assuming,
2170 for now anyway, for the future).
2173 Release 2012b - 2012-03-02 12:29:15 +0700
2175 There is just one change to tzcode2012b (compared with 2012a):
2176 the Makefile that was accidentally included with 2012a has been
2177 replaced with the version that should have been there, which is
2178 identical with the previous version (from tzcode2011i).
2180 There are just two changes in tzdata2012b compared with 2012a.
2182 Most significantly, summer time in Cuba has been delayed 3 weeks
2183 (now starts April 1 rather than March 11). Since Mar 11 (the old start
2184 date, as listed in 2012a) is just a little over a week away, this
2187 Less importantly, an excess tab in one of the changes in zone.tab
2188 in 2012a has been removed.
2191 Release 2012a - 2012-03-01 18:28:10 +0700
2193 The changes in tzcode2012a (compared to the previous version, 2011i)
2194 are entirely to the README and tz-art.htm and tz-link.htm files, if
2195 none of those concern you, you can ignore the code update. The changes
2196 reflect the changed addresses for the mailing list and the code and
2197 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile
2198 has been added to tz-link.htm).
2200 In tzdata2012a (compared to the previous release, which was 2011n)
2201 the major changes are:
2202 Chile 2011/2012 and 2012/2013 summer time date adjustments.
2203 Falkland Islands onto permanent summer time (we're assuming for the
2204 foreseeable future, though 2012 is all we're fairly certain of.)
2205 Armenia has abolished Summer Time.
2206 Tokelau jumped the International Date Line back last December
2207 (just the same as their near neighbour, Samoa).
2208 America/Creston is a new zone for a small area of British Columbia
2209 There will be a leapsecond 2012-06-30 23:59:60 UTC.
2211 Other minor changes are:
2212 Corrections to 1918 Canadian summer time end dates.
2213 Updated URL for UK time zone history (in comments)
2214 A few typos in Le Corre's list of free French place names (comments)
2217 Release data2011n - 2011-10-30 14:57:54 +0700
2219 There are three changes of note - most urgently, Cuba (America/Havana)
2220 has extended summer time by two weeks, now to end on Nov 13, rather than
2221 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic
2222 (Europe/Tiraspol) decided not to split from the rest of Moldova after
2223 all, and consequently that zone has been removed (again) and reinstated
2224 in the "backward" file as a link to Europe/Chisinau. And third, the
2225 end date for Fiji's summer time this summer was moved forward from the
2226 earlier planned Feb 26, to Jan 22.
2228 Apart from that, Moldova (MD) returns to a single entry in zone.tab
2229 (and the incorrect syntax that was in the 2011m version of that file
2230 is so fixed - it would have been fixed in a different way had this
2231 change not happened - that's the "missing" sccs version id).
2234 Release data2011m - 2011-10-24 21:42:16 +0700
2236 In particular, the typos in comments in the data (2011-11-17 should have
2237 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that
2238 Tim Parenti noted) have been fixed, and the change for Ukraine has been
2239 made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to
2240 Tim Parenti, and also Denys Gavrysh)
2242 In addition, I added Europe/Tiraspol to zone.tab.
2244 This time, all the files have new version numbers... (including the files
2245 otherwise unchanged in 2011m that were changed in 2011l but didn't get new
2246 version numbers there...)
2249 Release data2011l - 2011-10-10 11:15:43 +0700
2251 There are just 2 changes that cause different generated tzdata files from
2252 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil
2253 is included, but commented out. Compared with the diff I sent out last week,
2254 this version also includes attributions for the sources for the changes
2255 (in much the same format as ado used, but the html tags have not been
2256 checked, verified, or used in any way at all, so if there are errors there,
2257 please let me know.)
2260 Release data2011k - 2011-09-20 17:54:03 -0400
2265 Release data2011j - 2011-09-12 09:22:49 -0400
2267 (contemporary changes for Samoa; past changes for Kenya, Uganda, and
2268 Tanzania); there are also two spelling corrections to comments in
2269 the australasia file (with thanks to Christos Zoulas).
2272 Release 2011i - 2011-08-29 05:56:32 -0400
2277 Release data2011h - 2011-06-15 18:41:48 -0400
2279 Russia and Curaçao changes
2282 Release 2011g - 2011-04-25 09:07:22 -0400
2284 update the rules for Egypt to reflect its abandonment of DST this year
2287 Release 2011f - 2011-04-06 17:14:53 -0400
2292 Release 2011e - 2011-03-31 16:04:38 -0400
2294 Morocco, Chile, and tz-link changes
2297 Release 2011d - 2011-03-14 09:18:01 -0400
2299 changes that impact present-day time stamps in Cuba, Samoa, and Turkey
2302 Release 2011c - 2011-03-07 09:30:09 -0500
2304 These do affect current time stamps in Chile and Annette Island, Canada.
2307 Release 2011b - 2011-02-07 08:44:50 -0500
2312 Release 2011a - 2011-01-24 10:30:16 -0500
2317 Release data2010o - 2010-11-01 09:18:23 -0400
2319 change to the end of DST in Fiji in 2011
2322 Release 2010n - 2010-10-25 08:19:17 -0400
2327 Release 2010m - 2010-09-27 09:24:48 -0400
2329 Hong Kong, Vostok, and zic.c changes
2332 Release 2010l - 2010-08-16 06:57:25 -0400
2337 Release 2010k - 2010-07-26 10:42:27 -0400
2342 Release 2010j - 2010-05-10 09:07:48 -0400
2344 changes for Bahía de Banderas and for version naming
2347 Release data2010i - 2010-04-16 18:50:45 -0400
2349 the end of DST in Morocco on 2010-08-08
2352 Release data2010h - 2010-04-05 09:58:56 -0400
2357 Release data2010g - 2010-03-24 11:14:53 -0400
2362 Release 2010f - 2010-03-22 09:45:46 -0400
2367 Release data2010e - 2010-03-08 14:24:27 -0500
2369 corrects the Dhaka bug found by Danvin Ruangchan
2372 Release data2010d - 2010-03-06 07:26:01 -0500
2377 Release 2010c - 2010-03-01 09:20:58 -0500
2379 changes including KRE's suggestion for earlier initialization of
2380 "goahead" and "goback" structure elements
2383 Release code2010a - 2010-02-16 10:40:04 -0500
2388 Release data2010b - 2010-01-20 12:37:01 -0500
2393 Release data2010a - 2010-01-18 08:30:04 -0500
2398 Release data2009u - 2009-12-26 08:32:28 -0500
2400 changes to DST in Bangladesh
2403 Release 2009t - 2009-12-21 13:24:27 -0500
2408 Release data2009s - 2009-11-14 10:26:32 -0500
2410 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change
2413 Release 2009r - 2009-11-09 10:10:31 -0500
2415 "antarctica" and "tz-link.htm" changes
2418 Release 2009q - 2009-11-02 09:12:40 -0500
2420 with two corrections as reported by Eric Muller and Philip Newton
2423 Release data2009p - 2009-10-23 15:05:27 -0400
2425 Argentina (including San Luis) changes (with the correction from
2429 Release data2009o - 2009-10-14 16:49:38 -0400
2431 Samoa (commentary only), Pakistan, and Bangladesh changes
2434 Release data2009n - 2009-09-22 15:13:38 -0400
2436 added commentary for Argentina and a change to the end of DST in
2440 Release data2009m - 2009-09-03 10:23:43 -0400
2442 Samoa and Palestine changes
2445 Release data2009l - 2009-08-14 09:13:07 -0400
2447 Samoa (comments only) and Egypt
2450 Release 2009k - 2009-07-20 09:46:08 -0400
2455 Release data2009j - 2009-06-15 06:43:59 -0400
2457 Bangladesh change (with a short turnaround since the DST change is
2461 Release 2009i - 2009-06-08 09:21:22 -0400
2463 updating for DST in Bangladesh this year
2466 Release 2009h - 2009-05-26 09:19:14 -0400
2471 Release data2009g - 2009-04-20 16:34:07 -0400
2476 Release data2009f - 2009-04-10 11:00:52 -0400
2478 correct DST in Pakistan
2481 Release 2009e - 2009-04-06 09:08:11 -0400
2486 Release 2009d - 2009-03-23 09:38:12 -0400
2488 Morocco, Tunisia, Argentina, and American Astronomical Society changes
2491 Release data2009c - 2009-03-16 09:47:51 -0400
2493 change to the start of Cuban DST
2496 Release 2009b - 2009-02-09 11:15:22 -0500
2501 Release 2009a - 2009-01-21 10:09:39 -0500
2506 Release data2008i - 2008-10-21 12:10:25 -0400
2508 southamerica and zone.tab files, with Argentina DST rule changes and
2509 United States zone reordering and recommenting
2512 Release 2008h - 2008-10-13 07:33:56 -0400
2517 Release 2008g - 2008-10-06 09:03:18 -0400
2519 Fix a broken HTML anchor and update Brazil's DST transitions;
2520 there's also a slight reordering of information in tz-art.htm.
2523 Release data2008f - 2008-09-09 22:33:26 -0400
2528 Release 2008e - 2008-07-28 14:11:17 -0400
2530 changes by Arthur David Olson and Jesper Nørgaard Welen
2533 Release data2008d - 2008-07-07 09:51:38 -0400
2535 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo
2538 Release data2008c - 2008-05-19 17:48:03 -0400
2540 Pakistan, Morocco, and Mongolia
2543 Release data2008b - 2008-03-24 08:30:59 -0400
2545 including renaming Asia/Calcutta to Asia/Kolkata, with a backward
2549 Release 2008a - 2008-03-08 05:42:16 -0500
2554 Release 2007k - 2007-12-31 10:25:22 -0500
2556 most importantly, changes to the "southamerica" file based on
2557 Argentina's readoption of daylight saving time
2560 Release 2007j - 2007-12-03 09:51:01 -0500
2562 1. eliminate the "P" (parameter) macro;
2564 2. the "noncontroversial" changes circulated on the time zone
2565 mailing list (less the changes to "logwtmp.c");
2567 3. eliminate "too many transition" errors when "min" is used in time
2570 4. changes by Paul Eggert (including updated information for Venezuela).
2573 Release data2007i - 2007-10-30 10:28:11 -0400
2575 changes for Cuba and Syria
2578 Release 2007h - 2007-10-01 10:05:51 -0400
2580 changes by Paul Eggert, as well as an updated link to the ICU
2581 project in tz-link.htm
2584 Release 2007g - 2007-08-20 10:47:59 -0400
2586 changes by Paul Eggert
2588 The "leapseconds" file has been updated to incorporate the most
2589 recent International Earth Rotation and Reference Systems Service
2592 There's an addition to tz-art.htm regarding the television show "Medium".
2595 Release 2007f - 2007-05-07 10:46:46 -0400
2597 changes by Paul Eggert (including Haiti, Turks and Caicos, and New
2600 changes to zic.c to allow hour values greater than 24 (along with
2601 Paul's improved time value overflow checking)
2604 Release 2007e - 2007-04-02 10:11:52 -0400
2606 Syria and Honduras changes by Paul Eggert
2608 zic.c variable renaming changes by Arthur David Olson
2611 Release 2007d - 2007-03-20 08:48:30 -0400
2613 changes by Paul Eggert
2615 the elimination of white space at the ends of lines
2618 Release 2007c - 2007-02-26 09:09:37 -0500
2620 changes by Paul Eggert
2623 Release 2007b - 2007-02-12 09:34:20 -0500
2625 Paul Eggert's proposed change to the quotation handling logic in zic.c.
2627 changes to the commentary in "leapseconds" reflecting the IERS
2628 announcement that there is to be no positive leap second at the end
2632 Release 2007a - 2007-01-08 12:28:29 -0500
2634 changes by Paul Eggert
2636 Derick Rethan's Asmara change
2638 Oscar van Vlijmen's Easter Island local mean time change
2640 symbolic link changes
2643 Release 2006p - 2006-11-27 08:54:27 -0500
2645 changes by Paul Eggert
2648 Release 2006o - 2006-11-06 09:18:07 -0500
2650 changes by Paul Eggert
2653 Release 2006n - 2006-10-10 11:32:06 -0400
2655 changes by Paul Eggert
2658 Release 2006m - 2006-10-02 15:32:35 -0400
2660 changes for Uruguay, Palestine, and Egypt by Paul Eggert
2662 (minimalist) changes to zic.8 to clarify "until" information
2665 Release data2006l - 2006-09-18 12:58:11 -0400
2667 Paul's best-effort work on this coming weekend's Egypt time change
2670 Release 2006k - 2006-08-28 12:19:09 -0400
2672 changes by Paul Eggert
2675 Release 2006j - 2006-08-21 09:56:32 -0400
2677 changes by Paul Eggert
2680 Release code2006i - 2006-08-07 12:30:55 -0400
2684 Ken Pizzini's conversion script
2687 Release code2006h - 2006-07-24 09:19:37 -0400
2689 adds public domain notices to four files
2691 includes a fix for transition times being off by a second
2693 adds a new recording to the "arts" file (information courtesy Colin Bowern)
2696 Release 2006g - 2006-05-08 17:18:09 -0400
2698 northamerica changes by Paul Eggert
2701 Release 2006f - 2006-05-01 11:46:00 -0400
2703 a missing version number problem is fixed (with thanks to Bradley
2704 White for catching the problem)
2707 Release 2006d - 2006-04-17 14:33:43 -0400
2709 changes by Paul Eggert
2711 added new items to tz-arts.htm that were found by Paul
2714 Release 2006c - 2006-04-03 10:09:32 -0400
2716 two sets of data changes by Paul Eggert
2718 a fencepost error fix in zic.c
2720 changes to zic.c and the "europe" file to minimize differences
2721 between output produced by the old 32-bit zic and the new 64-bit
2725 Release 2006b - 2006-02-20 10:08:18 -0500
2726 [tz32code2006b + tz64code2006b + tzdata2006b]
2730 All SCCS IDs were bumped to "8.1" for this release.
2733 Release 2006a - 2006-01-30 08:59:31 -0500
2735 changes by Paul Eggert (in particular, Indiana time zone moves)
2737 an addition to the zic manual page to describe how special-case
2738 transitions are handled
2741 Release 2005r - 2005-12-27 09:27:13 -0500
2743 Canadian changes by Paul Eggert
2745 They also add "<pre>" directives to time zone data files and reflect
2746 changes to warning message logic in "zdump.c" (but with calls to
2747 "gettext" kept unbundled at the suggestion of Ken Pizzini).
2750 Release 2005q - 2005-12-13 09:17:09 -0500
2752 Nothing earth-shaking here:
2753 1. Electronic mail addresses have been removed.
2754 2. Casts of the return value of exit have been removed.
2755 3. Casts of the argument of is.* macros have been added.
2756 4. Indentation in one section of zic.c has been fixed.
2757 5. References to dead URLs in the data files have been dealt with.
2760 Release 2005p - 2005-12-05 10:30:53 -0500
2762 "systemv", "tz-link.htm", and "zdump.c" changes
2763 (less the casts of arguments to the is* macros)
2766 Release 2005o - 2005-11-28 10:55:26 -0500
2768 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert
2770 zdump.c lint fixes by Arthur David Olson
2773 Release 2005n - 2005-10-03 09:44:09 -0400
2775 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan
2779 Release 2005m - 2005-08-29 12:15:40 -0400
2781 changes by Paul Eggert (with a small tweak to the tz-art change)
2783 a declaration of an unused variable has been removed from zdump.c
2786 Release 2005l - 2005-08-22 12:06:39 -0400
2788 changes by Paul Eggert
2790 overflow/underflow checks by Arthur David Olson, minus changes to
2791 the "Theory" file about the pending addition of 64-bit data (I grow
2792 less confident of the changes being accepted with each passing day,
2793 and the changes no longer increase the data files nine-fold--there's
2794 less than a doubling in size by my local Sun's reckoning)
2797 Release 2005k - 2005-07-14 14:14:24 -0400
2799 The "leapseconds" file has been edited to reflect the recently
2800 announced leap second at the end of 2005.
2802 I've also deleted electronic mail addresses from the files as an
2806 Release 2005j - 2005-06-13 14:34:13 -0400
2808 These reflect changes to limit the length of time zone abbreviations
2809 and the characters used in those abbreviations.
2811 There are also changes to handle POSIX-style "quoted" time zone
2812 environment variables.
2814 The changes were circulated on the time zone mailing list; the only
2815 change since then was the removal of a couple of minimum-length of
2816 abbreviation checks.
2819 Release data2005i - 2005-04-21 15:04:16 -0400
2821 changes (most importantly to Nicaragua and Haiti) by Paul Eggert
2824 Release 2005h - 2005-04-04 11:24:47 -0400
2826 changes by Paul Eggert
2828 minor changes to Makefile and zdump.c to produce more useful output
2829 when doing a "make typecheck"
2832 Release 2005g - 2005-03-14 10:11:21 -0500
2834 changes by Paul Eggert (a change to current DST rules in Uruguay and
2835 an update to a link to time zone software)
2838 Release 2005f - 2005-03-01 08:45:32 -0500
2840 data and documentation changes by Paul Eggert
2843 Release 2005e - 2005-02-10 15:59:44 -0500
2848 Release code2005d - 2005-01-31 09:21:47 -0500
2850 make zic complain about links to links if the -v flag is used
2852 have "make public" do more code checking
2854 add an include to "localtime.c" for the benefit of gcc systems
2857 Release 2005c - 2005-01-17 18:36:29 -0500
2859 get better results when mktime runs on a system where time_t is double
2861 changes to the data files (most importantly to Paraguay)
2864 Release 2005b - 2005-01-10 09:19:54 -0500
2866 Get localtime and gmtime working on systems with exotic time_t types.
2868 Update the leap second commentary in the "leapseconds" file.
2871 Release 2005a - 2005-01-01 13:13:44 -0500
2876 Release code2004i - 2004-12-14 13:42:58 -0500
2878 Deal with systems where time_t is unsigned.
2881 Release code2004h - 2004-12-07 11:40:18 -0500
2883 64-bit-time_t changes
2886 Release 2004g - 2004-11-02 09:06:01 -0500
2888 update to Cuba (taking effect this weekend)
2890 other changes by Paul Eggert
2892 correction of the spelling of Oslo
2894 changed versions of difftime.c and private.h
2897 Release code2004f - 2004-10-21 10:25:22 -0400
2899 Cope with wide-ranging tm_year values.
2902 Release 2004e - 2004-10-11 14:47:21 -0400
2904 Brazil/Argentina/Israel changes by Paul Eggert
2906 changes to tz-link.htm by Paul
2908 one small fix to Makefile
2911 Release 2004d - 2004-09-22 08:27:29 -0400
2913 Avoid overflow problems when TM_YEAR_BASE is added to an integer.
2916 Release 2004c - 2004-08-11 12:06:26 -0400
2918 asctime-related changes
2920 (variants of) some of the documentation changes suggested by Paul Eggert
2923 Release 2004b - 2004-07-19 14:33:35 -0400
2925 data changes by Paul Eggert - most importantly, updates for Argentina
2928 Release 2004a - 2004-05-27 12:00:47 -0400
2930 changes by Paul Eggert
2932 Handle DST transitions that occur at the end of a month in some
2933 years but at the start of the following month in other years.
2935 Add a copy of the correspondence that's the basis for claims about
2936 DST in the Navajo Nation.
2939 Release 2003e - 2003-12-15 09:36:47 -0500
2941 changes by Arthur David Olson (primarily code changes)
2943 changes by Paul Eggert (primarily data changes)
2945 minor changes to "Makefile" and "northamerica" (in the latter case,
2946 optimization of the "Toronto" rules)
2949 Release 2003d - 2003-10-06 09:34:44 -0400
2951 changes by Paul Eggert
2954 Release 2003c - 2003-09-16 10:47:05 -0400
2956 Fix bad returns in zic.c's inleap function.
2957 Thanks to Bradley White for catching the problem!
2960 Release 2003b - 2003-09-16 07:13:44 -0400
2962 Add a "--version" option (and documentation) to the zic and zdump commands.
2964 changes to overflow/underflow checking in zic
2966 a localtime typo fix.
2968 Update the leapseconds and tz-art.htm files.
2971 Release 2003a - 2003-03-24 09:30:54 -0500
2973 changes by Paul Eggert
2975 a few additions and modifications to the tz-art.htm file
2978 Release 2002d - 2002-10-15 13:12:42 -0400
2980 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab
2982 There's also a new time zone quote in "tz-art.htm".
2985 Release 2002c - 2002-04-04 11:55:20 -0500
2987 changes by Paul Eggert
2989 Change zic.c to avoid creating symlinks to files that don't exist.
2992 Release 2002b - 2002-01-28 12:56:03 -0500
2994 [These change notes are for Release 2002a, which was corrupted.
2995 2002b was a corrected version of 2002a.]
2997 changes by Paul Eggert
2999 Update the "leapseconds" file to note that there'll be no leap
3000 second at the end of June, 2002.
3002 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone.
3004 Change to "difftime.c" to avoid sizeof problems.
3007 Release 2001d - 2001-10-09 13:31:32 -0400
3009 changes by Paul Eggert
3012 Release 2001c - 2001-06-05 13:59:55 -0400
3014 changes by Paul Eggert and Andrew Brown
3017 Release 2001b - 2001-04-05 16:44:38 -0400
3019 changes by Paul Eggert (modulo jnorgard's typo fix)
3021 tz-art.htm has been HTMLified.
3024 Release 2001a - 2001-03-13 12:57:44 -0500
3026 changes by Paul Eggert
3028 An addition to the "leapseconds" file: comments with the text of the
3029 latest IERS leap second notice.
3031 Trailing white space has been removed from data file lines, and
3032 repeated spaces in "Rule Jordan" lines in the "asia" file have been
3036 Release 2000h - 2000-12-14 15:33:38 -0500
3038 changes by Paul Eggert
3040 one typo fix in the "art" file
3042 With providence, this is the last update of the millennium.
3045 Release 2000g - 2000-10-10 11:35:22 -0400
3047 changes by Paul Eggert
3049 correction of John Mackin's name submitted by Robert Elz
3051 Garry Shandling's Daylight Saving Time joke (!?!) from the recent
3052 Emmy Awards broadcast.
3055 Release 2000f - 2000-08-10 09:31:58 -0400
3057 changes by Paul Eggert
3059 Added information in "tz-art.htm" on a Seinfeld reference to DST.
3061 Error checking and messages in the "yearistype" script have been
3065 Release 2000e - 2000-07-31 09:27:54 -0400
3067 data changes by Paul Eggert
3069 a change to the default value of the defined constant HAVE_STRERROR
3071 the addition of a Dave Barry quote on DST to the tz-arts file
3074 Release 2000d - 2000-04-20 15:43:04 -0400
3076 changes to the documentation and code of strftime for C99 conformance
3078 a bug fix for date.c
3080 These are based on (though modified from) changes by Paul Eggert.
3083 Release 2000c - 2000-03-04 10:31:43 -0500
3085 changes by Paul Eggert
3088 Release 2000b - 2000-02-21 12:16:29 -0500
3090 changes by Paul Eggert and Joseph Myers
3092 modest tweaks to the tz-art.htm and tz-link.htm files
3095 Release 2000a - 2000-01-18 09:21:26 -0500
3097 changes by Paul Eggert
3099 The two hypertext documents have also been renamed.
3102 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500
3104 Paul Eggert's changes
3106 additions to the "zic" manual page and the "Arts.htm" file
3109 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500
3114 Release data1999h - 1999-10-07 03:50:29 -0400
3116 changes by Paul Eggert to "europe" (most importantly, fixing
3117 Lithuania and Estonia)
3120 Release 1999g - 1999-09-28 11:06:18 -0400
3122 data changes by Paul Eggert (most importantly, the change for
3123 Lebanon that buys correctness for this coming Sunday)
3125 The "code" file contains changes to "Makefile" and "checktab.awk" to
3126 allow better checking of time zone files before they are published.
3129 Release 1999f - 1999-09-23 09:48:14 -0400
3131 changes by Arthur David Olson and Paul Eggert
3134 Release 1999e - 1999-08-17 15:20:54 -0400
3136 changes circulated by Paul Eggert, although the change to handling
3137 of DST-specifying time zone names has been commented out for now
3138 (search for "XXX" in "localtime.c" for details). These files also
3139 do not make any changes to the start of DST in Brazil.
3141 In addition to Paul's changes, there are updates to "Arts.htm" and
3145 Release 1999d - 1999-03-30 11:31:07 -0500
3147 changes by Paul Eggert
3149 The Makefile's "make public" rule has also been changed to do a test
3150 compile of each individual time zone data file (which should help
3151 avoid problems such as the one we had with Nicosia).
3154 Release 1999c - 1999-03-25 09:47:47 -0500
3156 changes by Paul Eggert, most importantly the change for Chile.
3159 Release 1999b - 1999-02-01 17:51:44 -0500
3161 changes by Paul Eggert
3163 code changes (suggested by Mani Varadarajan, mani at be.com) for
3164 correct handling of symbolic links when building using a relative directory
3166 code changes to generate correct messages for failed links
3168 updates to the URLs in Arts.htm
3171 Release 1999a - 1999-01-19 16:20:29 -0500
3173 error message internationalizations and corrections in zic.c and
3174 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz,
3178 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400
3180 changes for Brazil, Chile, and Germany
3182 support for use of "24:00" in the input files for the time zone compiler
3185 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400
3187 changes by Paul Eggert
3189 correction to a define in the "private.h" file
3192 Release data1998g - 1998-08-11 03:28:35 -0000
3193 [tzdata1998g.tar.gz is missing!]
3195 Lithuanian change provided by mgedmin at pub.osf.it
3197 Move creation of the GMT link with Etc/GMT to "etcetera" (from
3198 "backward") to ensure that the GMT file is created even where folks
3199 don't want the "backward" links (as suggested by Paul Eggert).
3202 Release data1998f - 1998-07-20 13:50:00 -0000
3203 [tzdata1998f.tar.gz is missing!]
3205 Update the "leapseconds" file to include the newly-announced
3206 insertion at the end of 1998.
3209 Release code1998f - 1998-06-01 10:18:31 -0400
3211 addition to localtime.c by Guy Harris
3214 Release 1998e - 1998-05-28 09:56:26 -0400
3216 The Makefile is changed to produce zoneinfo-posix rather than
3217 zoneinfo/posix, and to produce zoneinfo-leaps rather than
3220 data changes by Paul Eggert
3222 changes from Guy Harris to provide asctime_r and ctime_r
3224 A usno1998 file (substantially identical to usno1997) has been added.
3227 Release 1998d - 1998-05-14 11:58:34 -0400
3229 changes to comments (in particular, elimination of references to CIA maps).
3230 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places
3231 where changes occur.
3234 Release 1998c - 1998-02-28 12:32:26 -0500
3236 changes by Paul Eggert (save the "French correction," on which I'll
3237 wait for the dust to settle)
3241 changes and additions to Arts.htm
3244 Release 1998b - 1998-01-17 14:31:51 -0500
3246 URL cleanups and additions
3249 Release 1998a - 1998-01-13 12:37:35 -0500
3251 changes by Paul Eggert
3254 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500
3256 changes by Paul Eggert, with minor modifications from Arthur David
3257 Olson to make the files more browser friendly
3260 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500
3262 minor changes to put "TZif" at the start of each time zone information file
3264 a rule has also been added to the Makefile so you can
3266 to just recompile the zone information files (rather than doing a
3267 full "make install" with its other effects).
3270 Release data1997i - 1997-10-07 08:45:38 -0400
3272 changes to Africa by Paul Eggert
3275 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400
3277 corrections for Uruguay (and other locations)
3279 Arthur David Olson's simple-minded fix allowing mktime to both
3280 correctly handle leap seconds and correctly handle tm_sec values
3281 upon which arithmetic has been performed.
3284 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400
3286 Paul Eggert's updates
3288 a small change to a function prototype;
3290 "Music" has been renamed "Arts.htm", HTMLified, and augmented to
3291 include information on Around the World in Eighty Days.
3294 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400
3296 fixes to zic's error handling
3298 changes inspired by the item circulated on Slovenia
3300 The description of Web resources has been HTMLified for browsing
3303 A new piece of tz-related music has been added to the "Music" file.
3306 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500
3308 Paul Eggert's latest suggestions
3311 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500
3313 changes to "zic.c" to correct performance of the "-s" option
3315 a new file "usno1997"
3318 Release data1997c - 1997-03-04 09:58:18 -0500
3323 Release 1997b - 1997-02-27 18:34:19 -0500
3325 The data file incorporates the 1997 leap second.
3327 The code file incorporates Arthur David Olson's take on the
3328 zic/multiprocessor/directory-creation situation.
3331 Release 1997a - 1997-01-21 09:11:10 -0500
3333 Paul Eggert's Antarctica (and other changes)
3335 Arthur David Olson finessed the "getopt" issue by checking against
3336 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1
3337 is returned while SunOS 5.5's manual says EOF is returned).
3340 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500
3342 Paul Eggert's latest changes
3345 Release code1996n - 1996-12-16 09:42:02 -0500
3347 link snapping fix from Bruce Evans (via Garrett Wollman)
3350 Release data1996m - 1996-11-24 02:37:34 -0000
3351 [tzdata1996m.tar.gz is missing!]
3353 Paul Eggert's batch of changes
3356 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500
3358 No functional changes here; the files have simply been changed to
3359 make more use of ISO style dates in comments. The names of the above
3360 files now include the year in full.
3363 Release code96l - 1996-09-08 17:12:20 -0400
3365 tzcode96k was missing a couple of pieces.
3368 Release 96k - 1996-09-08 16:06:22 -0400
3370 the latest round of changes from Paul Eggert
3372 the recent Year 2000 material
3375 Release code96j - 1996-07-30 13:18:53 -0400
3377 Set sp->typecnt as suggested by Timothy Patrick Murphy.
3380 Release code96i - 1996-07-27 20:11:35 -0400
3382 Paul's suggested patch for strftime %V week numbers
3385 Release data96i - 1996-07-01 18:13:04 -0400
3387 "northamerica" and "europe" changes by Paul Eggert
3390 Release code96h - 1996-06-05 08:02:21 -0400
3392 fix for handling transitions specified in Universal Time
3394 Some "public domain" notices have also been added.
3397 Release code96g - 1996-05-16 14:00:26 -0400
3399 fix for the simultaneous-DST-and-zone-change challenge
3402 Release data96h - 1996-05-09 17:40:51 -0400
3404 changes by Paul Eggert
3407 Release code96f-data96g - 1996-05-03 03:09:59 -0000
3408 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!]
3410 The changes get us some of the way to fixing the problems noted in Paul
3411 Eggert's letter yesterday (in addition to a few others). The approach
3412 has been to make zic a bit smarter about figuring out what time zone
3413 abbreviations apply just after the time specified in the "UNTIL" part
3414 of a zone line. Putting the smarts in zic means avoiding having
3415 transition times show up in both "Zone" lines and "Rule" lines, which
3416 in turn avoids multiple transition time entries in time zone files.
3417 (This also makes the zic input files such as "europe" a bit shorter and
3418 should ease maintenance.)
3421 Release data96f - 1996-04-19 19:20:03 -0000
3422 [tzdata96f.tar.gz is missing!]
3424 The only changes are to the "northamerica" file; the time zone
3425 abbreviation for Denver is corrected to MST (and MDT), and the
3426 comments for Mexico have been updated.
3429 Release data96e - 1996-03-19 17:37:26 -0500
3431 Proposals by Paul Eggert, in particular the Portugal change that
3432 comes into play at the end of this month.
3435 Release data96d - 1996-03-18 20:49:39 -0500
3440 Release code96e - 1996-02-29 15:43:27 -0000
3441 [tzcode96e.tar.gz is missing!]
3443 internationalization changes and the fix to the documentation for strftime
3446 Release code96d-data96c - 1996-02-12 11:05:27 -0500
3448 The "code" file simply updates Bob Kridle's electronic address.
3450 The "data" file updates rules for Mexico.
3453 Release data96b - 1996-01-27 15:44:42 -0500
3458 Release code96c - 1996-01-16 16:58:15 -0500
3460 leap-year streamlining and binary-search changes
3465 Release code96b - 1996-01-10 20:42:39 -0500
3467 fixes and enhancements from Paul Eggert, including code that
3468 emulates the behavior of recent versions of the SunOS "date"
3472 Release 96a - 1996-01-06 09:08:24 -0500
3476 fixes to strftime.c for correct ISO 8601 week number generation,
3477 plus support for two new formats ('G' and 'g') to give ISO 8601 year
3478 numbers (which are not necessarily the same as calendar year numbers)
3481 Release code95i-data95m - 1995-12-21 12:46:47 -0500
3483 The latest revisions from Paul Eggert are included, the usno1995
3484 file has been updated, and a new file ("WWW") covering useful URLs
3488 Release code95h-data95l - 1995-12-19 18:10:12 -0500
3490 A simplification of a macro definition, a change to data for Sudan,
3491 and (for last minute shoppers) notes in the "Music" file on the CD
3495 Release code95g-data95k - 1995-10-30 10:32:47 -0500
3497 (slightly reformatted) 8-bit-clean proposed patch
3499 minor patch: US/Eastern -> America/New_York
3501 snapshot of the USNO's latest data ("usno1995")
3503 some other minor cleanups
3506 Release code95f-data95j - 1995-10-28 21:01:34 -0000
3507 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!]
3511 support for 64-bit time_t's
3513 optimization in localtime.c
3516 Release code95e - 1995-10-13 13:23:57 -0400
3518 the mktime change to scan from future to past when trying to find time zone
3522 Release data95i - 1995-09-26 10:43:26 -0400
3524 For Canada/Central, guess that the Sun customer's "one week too
3525 early" was just a approximation, and the true error is one month
3526 too early. This is consistent with the rest of Canada.
3529 Release data95h - 1995-09-21 11:26:48 -0400
3531 latest changes from Paul Eggert
3534 Release code95d - 1995-09-14 11:14:45 -0400
3536 the addition of a "Music" file, which documents four recorded
3537 versions of the tune "Save That Time".
3540 Release data95g - 1995-09-01 17:21:36 -0400
3542 "yearistype" correction
3545 Release data95f - 1995-08-28 20:46:56 -0400
3547 Paul Eggert's change to the australasia file
3550 Release data95e - 1995-07-08 18:02:34 -0400
3552 The only change is a leap second at the end of this year.
3553 Thanks to Bradley White for forwarding news on the leap second.
3556 Release data95d - 1995-07-03 13:26:22 -0400
3558 Paul Eggert's changes
3561 Release data95c - 1995-07-02 19:19:28 -0400
3563 changes to "asia", "backward", "europe", and "southamerica"
3564 (read: northamericacentrics need not apply)
3567 Release code95c - 1995-03-13 14:00:46 -0500
3569 one-line fix for sign extension problems in detzcode
3572 Release 95b - 1995-03-04 11:22:38 -0500
3574 Minor changes in both:
3576 The "code" file contains a workaround for the lack of "unistd.h" in
3577 Microsoft C++ version 7.
3579 The "data" file contains a fixed "Link" for America/Shiprock.
3582 Release 94h - 1994-12-10 12:51:14 -0500
3586 * incorporate the changes to "zdump" and "date" to make changes to
3587 the "TZ" environment variable permanent;
3589 * incorporate the table changes by Paul Eggert;
3591 * include (and document) support for universal time specifications in
3592 data files - but do not (yet) include use of this feature in the
3595 Think of this as "TZ Classic" - the software has been set up not to break if
3596 universal time shows up in its input, and data entries have been
3597 left as is so as not to break existing implementations.
3600 Release data94f - 1994-08-20 12:56:09 -0400
3602 (with thanks!) the latest data updates from Paul Eggert
3605 Release data94e - 1994-06-04 13:13:53 -0400
3610 Release code94g - 1994-05-05 12:14:07 -0400
3612 fix missing "optind.c" and a reference to it in the Makefile
3615 Release code94f - 1994-05-05 13:00:33 -0000
3616 [tzcode94f.tar.gz is missing!]
3618 changes to avoid overflow in difftime, as well as changes to cope
3619 with the 52/53 challenge in strftime
3622 Release code94e - 1994-03-30 23:32:59 -0500
3624 change for the benefit of PCTS
3627 Release 94d - 1994-02-24 15:42:25 -0500
3629 Avoid clashes with POSIX semantics for zones such as GMT+4.
3631 Some other very minor housekeeping is also present.
3634 Release code94c - 1994-02-10 08:52:40 -0500
3636 Fix bug where mkdirs was broken unless you compile with
3637 -fwritable-strings (which is generally losing to do).
3640 Release 94b - 1994-02-07 10:04:33 -0500
3642 work by Paul Eggert who notes:
3644 I found another book of time zone histories by E W Whitman; it's not
3645 as extensive as Shanks but has a few goodies of its own. I used it
3646 to update the tables. I also fixed some more as a result of
3647 correspondence with Adam David and Peter Ilieve, and move some stray
3648 links from 'europe' to 'backward'. I corrected some scanning errors
3651 As far as the code goes, I fixed zic to allow years in the range
3652 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900.
3653 And I cleaned up the zic documentation a little bit.
3656 Release data94a - 1994-02-03 08:58:54 -0500
3658 It simply incorporates the recently announced leap second into the
3662 Release 93g - 1993-11-22 17:28:27 -0500
3664 Paul Eggert has provided a good deal of historic information (based
3665 on Shanks), and there are some code changes to deal with the buglets
3666 that crawled out in dealing with the new information.
3669 Release 93f - 1993-10-15 12:27:46 -0400
3671 Paul Eggert's changes
3674 Release 93e - 1993-09-05 21:21:44 -0400
3676 This has updated data for Israel, England, and Kwajalein. There's
3677 also an update to "zdump" to cope with Kwajalein's 24-hour jump.
3678 Thanks to Paul Eggert and Peter Ilieve for the changes.
3681 Release 93d - 1993-06-17 23:34:17 -0400
3683 new fix and new data on Israel
3686 Release 93c - 1993-06-06 19:31:55 -0400
3691 Release 93b - 1993-02-02 14:53:58 -0500
3693 updated "leapseconds" file
3696 Release 93 - 1993-01-08 07:01:06 -0500
3698 At kre's suggestion, the package has been split in two - a code piece
3699 (which also includes documentation) that's only of use to folks who
3700 want to recompile things and a data piece useful to anyone who can
3703 The new version has a few changes to the data files, a few
3704 portability changes, and an off-by-one fix (with thanks to
3705 Tom Karzes at deshaw.com for providing a description and a
3709 Release 92c - 1992-11-21 17:35:36 -0000
3710 [tz92c.tar.Z is missing!]
3712 The fallout from the latest round of DST transitions.
3714 There are changes for Portugal, Saskatchewan, and "Pacific-New";
3715 there's also a change to "zic.c" that makes it portable to more systems.
3718 Release 92 - 1992-04-25 18:17:03 -0000
3719 [tz92.tar.Z is missing!]
3721 By popular demand (well, at any rate, following a request by kre at munnari)
3724 The 1989 update of the time zone package featured:
3726 * POSIXization (including interpretation of POSIX-style TZ environment
3727 variables, provided by Guy Harris),
3728 * ANSIfication (including versions of "mktime" and "difftime"),
3729 * SVIDulation (an "altzone" variable)
3730 * MACHination (the "gtime" function)
3731 * corrections to some time zone data (including corrections to the rules
3732 for Great Britain and New Zealand)
3733 * reference data from the United States Naval Observatory for folks who
3734 want to do additional time zones
3735 * and the 1989 data for Saudi Arabia.
3737 (Since this code will be treated as "part of the implementation" in some
3738 places and as "part of the application" in others, there's no good way to
3739 name functions, such as timegm, that are not part of the proposed ANSI C
3740 standard; such functions have kept their old, underscore-free names in this
3743 And the "dysize" function has disappeared; it was present to allow
3744 compilation of the "date" command on old BSD systems, and a version of "date"
3745 is now provided in the package. The "date" command is not created when you
3746 "make all" since it may lack options provided by the version distributed with
3747 your operating system, or may not interact with the system in the same way
3748 the native version does.
3750 Since POSIX frowns on correct leap second handling, the default behavior of
3751 the "zic" command (in the absence of a "-L" option) has been changed to omit
3752 leap second information from its output files.
3758 This file contains copies of the part of each release announcement
3759 that talks about the changes in that release. The text has been
3760 adapted and reformatted for the purposes of this file.
3762 Traditionally a release R consists of a pair of tarball files,
3763 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g.,
3764 code2010a, data2012c) consist of just one or the other tarball, and a
3765 few (e.g., code2012c-data2012d) have tarballs with mixed version
3766 numbers. Recent releases also come in an experimental format
3767 consisting of a single tarball tzdb-R.tar.lz with extra data.
3769 Release time stamps are taken from the release's commit (for newer,
3770 Git-based releases), from the newest file in the tarball (for older
3771 releases, where this info is available) or from the email announcing
3772 the release (if all else fails; these are marked with a time zone of
3773 -0000 and an "is missing!" comment).
3775 Earlier versions of the code and data were not announced on the tz
3776 list and are not summarized here.
3778 This file is in the public domain.