1 News for the tz database
4 Release 2015e - 2015-06-13 10:56:02 -0700
6 Changes affecting future time stamps
8 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00,
9 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.)
11 Assume Cayman Islands will observe DST starting next year, using US rules.
12 Although it isn't guaranteed, it is the most likely.
14 Changes affecting data format
16 The file 'iso3166.tab' now uses UTF-8, so that its entries can better
17 spell the names of Åland Islands, Côte d'Ivoire, and Réunion.
19 Changes affecting code
21 When displaying data, tzselect converts it to the current locale's
22 encoding if the iconv command works. (Problem reported by random832.)
24 tzselect no longer mishandles Dominica, fixing a bug introduced
25 in Release 2014f. (Problem reported by Owen Leibman.)
27 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\".
28 This fixes a bug introduced in Release 2014f.
29 (Problem reported by Leonardo Chiquitto.)
32 Release 2015d - 2015-04-24 08:09:46 -0700
34 Changes affecting future time stamps
36 Egypt will not observe DST in 2015 and will consider canceling it
37 permanently. For now, assume no DST indefinitely.
38 (Thanks to Ahmed Nazmy and Tim Parenti.)
40 Changes affecting past time stamps
42 America/Whitehorse switched from UTC-9 to UTC-8 on 1967-05-28, not
43 1966-07-01. Also, Yukon's time zone history is documented better.
44 (Thanks to Brian Inglis and Dennis Ferguson.)
46 Change affecting past and future time zone abbreviations
48 The abbreviations for Hawaii-Aleutian standard and daylight times
49 have been changed from HAST/HADT to HST/HDT, as per US Government
50 Printing Office style. This affects only America/Adak since 1983,
51 as America/Honolulu was already using the new style.
53 Changes affecting code
55 zic has some minor performance improvements.
58 Release 2015c - 2015-04-11 08:55:55 -0700
60 Changes affecting future time stamps
62 Egypt's spring-forward transition is at 24:00 on April's last Thursday,
63 not 00:00 on April's last Friday. 2015's transition will therefore be on
64 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes
65 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.)
67 Changes affecting past time stamps
69 The following changes affect some pre-1991 Chile-related time stamps
70 in America/Santiago, Antarctica/Palmer, and Pacific/Easter.
72 The 1910 transition was January 10, not January 1.
74 The 1918 transition was September 10, not September 1.
76 The UTC-4 time observed from 1932 to 1942 is now considered to be
77 standard time, not year-round DST.
79 Santiago observed DST (UTC-3) from 1946-07-15 through 1946-08-31,
80 then reverted to standard time, then switched its time zone to
83 Assume transitions before 1968 were at 00:00, since we have no data
86 The spring 1988 transition was 1988-10-09, not 1988-10-02.
87 The fall 1990 transition was 1990-03-11, not 1990-03-18.
89 Assume no UTC offset change for Pacific/Easter on 1890-01-01,
90 and omit all transitions on Pacific/Easter from 1942 through 1946
91 since we have no data suggesting that they existed.
93 One more zone has been turned into a link, as it differed
94 from an existing zone only for older time stamps. As usual,
95 this change affects UTC offsets in pre-1970 time stamps only.
96 The zone's old contents have been moved to the 'backzone' file.
97 The affected zone is America/Montreal.
99 Changes affecting commentary
101 Mention the TZUpdater tool.
103 Mention "The Time Now". (Thanks to Brandon Ramsey.)
106 Release 2015b - 2015-03-19 23:28:11 -0700
108 Changes affecting future time stamps
110 Mongolia will start observing DST again this year, from the last
111 Saturday in March at 02:00 to the last Saturday in September at 00:00.
112 (Thanks to Ganbold Tsagaankhuu.)
114 Palestine will start DST on March 28, not March 27. Also,
115 correct the fall 2014 transition from September 26 to October 24.
116 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.)
118 Changes affecting past time stamps
120 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a
121 regression. (Thanks to Stuart Bishop for reporting the problem.)
123 Some more zones have been turned into links, when they differed
124 from existing zones only for older time stamps. As usual,
125 these changes affect UTC offsets in pre-1970 time stamps only.
126 Their old contents have been moved to the 'backzone' file.
127 The affected zones are: America/Antigua, America/Cayman,
128 Pacific/Midway, and Pacific/Saipan.
130 Changes affecting time zone abbreviations
132 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD".
135 Changes affecting code
137 Fix integer overflow bug in reference 'mktime' implementation.
138 (Problem reported by Jörg Richter.)
140 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries
141 to be used in the same executable as standard-library time_t functions.
142 (Problems reported by Bradley White.)
144 Changes affecting commentary
146 Cite the recent Mexican decree changing Quintana Roo's time zone.
147 (Thanks to Carlos Raúl Perasso.)
149 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.)
151 Update info about Mars time.
154 Release 2015a - 2015-01-29 22:35:20 -0800
156 Changes affecting future time stamps
158 The Mexican state of Quintana Roo, represented by America/Cancun,
159 will shift from Central Time with DST to Eastern Time without DST
160 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.)
162 Chile will not change clocks in April or thereafter; its new standard time
163 will be its old daylight saving time. This affects America/Santiago,
164 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.)
166 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
167 (Thanks to Tim Parenti.)
169 Changes affecting past time stamps
171 Iceland observed DST in 1919 and 1921, and its 1939 fallback
172 transition was Oct. 29, not Nov. 29. Remove incorrect data from
173 Shanks about time in Iceland between 1837 and 1908.
175 Some more zones have been turned into links, when they differed
176 from existing zones only for older time stamps. As usual,
177 these changes affect UTC offsets in pre-1970 time stamps only.
178 Their old contents have been moved to the 'backzone' file.
179 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
182 Changes affecting code
184 tzalloc now scrubs time zone abbreviations compatibly with the way
185 that tzset always has, by replacing invalid bytes with '_' and by
186 shortening too-long abbreviations.
188 tzselect ports to POSIX awk implementations, no longer mishandles
189 POSIX TZ settings when GNU awk is used, and reports POSIX TZ
190 settings to the user. (Thanks to Stefan Kuhn.)
192 Changes affecting build procedure
194 'make check' now checks for links to links in the data.
195 One such link (for Africa/Asmera) has been fixed.
196 (Thanks to Stephen Colebourne for pointing out the problem.)
198 Changes affecting commentary
200 The leapseconds file commentary now mentions the expiration date.
201 (Problem reported by Martin Burnicki.)
203 Update Mexican Library of Congress URL.
206 Release 2014j - 2014-11-10 17:37:11 -0800
208 Changes affecting current and future time stamps
210 Turks & Caicos' switch from US eastern time to UTC-4 year-round
211 did not occur on 2014-11-02 at 02:00. It's currently scheduled
212 for 2015-11-01 at 02:00. (Thanks to Chris Walton.)
214 Changes affecting past time stamps
216 Many pre-1989 time stamps have been corrected for Asia/Seoul and
217 Asia/Pyongyang, based on sources for the Korean-language Wikipedia
218 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no
219 longer guess that Pyongyang mimicked Seoul time after World War II,
220 as this is politically implausible.
222 Some more zones have been turned into links, when they differed
223 from existing zones only for older time stamps. As usual,
224 these changes affect UTC offsets in pre-1970 time stamps only.
225 Their old contents have been moved to the 'backzone' file.
226 The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
227 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
228 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and
231 Changes affecting commentary
233 The commentary is less enthusiastic about Shanks as a source,
234 and is more careful to distinguish UT from UTC.
237 Release 2014i - 2014-10-21 22:04:57 -0700
239 Changes affecting future time stamps
241 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
242 (Thanks to Ken Rylander for the heads-up.) Guess that future
243 years will use a similar pattern.
245 A new Zone Pacific/Bougainville, for the part of Papua New Guinea
246 that plans to switch from UTC+10 to UTC+11 on 2014-12-28 at 02:00.
247 (Thanks to Kiley Walbom for the heads-up.)
249 Changes affecting time zone abbreviations
251 Since Belarus is not changing its clocks even though Moscow is,
252 the time zone abbreviation in Europe/Minsk is changing from FET
253 to its more-traditional value MSK on 2014-10-26 at 01:00.
254 (Thanks to Alexander Bokovoy for the heads-up about Belarus.)
256 The new abbreviation IDT stands for the pre-1976 use of UT+8 in
257 Indochina, to distinguish it better from ICT (UT+7).
259 Changes affecting past time stamps
261 Many time stamps have been corrected for Asia/Ho_Chi_Minh before 1976
262 (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
263 authoritative book). Asia/Ho_Chi_Minh has been added to
264 zone1970.tab, to give tzselect users in Vietnam two choices,
265 since north and south Vietnam disagreed after our 1970 cutoff.
267 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
268 they differed from existing zones only for older time stamps. As
269 usual, these changes affect pre-1970 time stamps only. Their old
270 contents have been moved to the 'backzone' file.
272 Changes affecting code
274 The time-related library functions now set errno on failure, and
275 some crashes in the new tzalloc-related library functions have
276 been fixed. (Thanks to Christos Zoulas for reporting most of
277 these problems and for suggesting fixes.)
279 If USG_COMPAT is defined and the requested time stamp is standard time,
280 the tz library's localtime and mktime functions now set the extern
281 variable timezone to a value appropriate for that time stamp; and
282 similarly for ALTZONE, daylight saving time, and the altzone variable.
283 This change is a companion to the tzname change in 2014h, and is
284 designed to make timezone and altzone more compatible with tzname.
286 The tz library's functions now set errno to EOVERFLOW if they fail
287 because the result cannot be represented. ctime and ctime_r now
288 return NULL and set errno when a time stamp is out of range, rather
289 than having undefined behavior.
291 Some bugs associated with the new 2014g functions have been fixed.
292 This includes a bug that largely incapacitated the new functions
293 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.)
294 It also includes some uses of uninitialized variables after tzalloc.
295 The new code uses the standard type 'ssize_t', which the Makefile
296 now gives porting advice about.
298 Changes affecting commentary
300 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis).
303 Release 2014h - 2014-09-25 18:59:03 -0700
305 Changes affecting past time stamps
307 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.
309 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01,
310 not 1920-01-06. The old entry was based on a misinterpretation of Shanks.
312 Some more zones have been turned into links, when they differed
313 from existing zones only for older time stamps. As usual,
314 these changes affect UTC offsets in pre-1970 time stamps only.
315 Their old contents have been moved to the 'backzone' file.
316 The affected zones are: Africa/Blantyre, Africa/Bujumbura,
317 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
318 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane.
320 Changes affecting code
322 zdump -V and -v now output gmtoff= values on all platforms,
323 not merely on platforms defining TM_GMTOFF.
325 The tz library's localtime and mktime functions now set tzname to a value
326 appropriate for the requested time stamp, and zdump now uses this
327 on platforms not defining TM_ZONE, fixing a 2014g regression.
328 (Thanks to Tim Parenti for reporting the problem.)
330 The tz library no longer sets tzname if localtime or mktime fails.
332 zdump -c no longer mishandles transitions near year boundaries.
333 (Thanks to Tim Parenti for reporting the problem.)
335 An access to uninitalized data has been fixed.
336 (Thanks to Jörg Richter for reporting the problem.)
338 When THREAD_SAFE is defined, the code ports to the C11 memory model.
339 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined
340 and two threads race to initialize data used by gmtime-like functions.
341 (Thanks to Andy Heninger for reporting the problems.)
343 Changes affecting build procedure
345 'make check' now checks better for properly-sorted data.
347 Changes affecting documentation and commentary
349 zdump's gmtoff=N output is now documented, and its isdst=D output
350 is now documented to possibly output D values other than 0 or 1.
352 zdump -c's treatment of years is now documented to use the
353 Gregorian calendar and Universal Time without leap seconds,
354 and its behavior at cutoff boundaries is now documented better.
355 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.)
357 Programs are now documented to use the proleptic Gregorian calendar.
358 (Thanks to Alan Barrett for the suggestion.)
360 Fractional-second GMT offsets have been documented for civil time
361 in 19th-century Chennai, Jakarta, and New York.
364 Release 2014g - 2014-08-28 12:31:23 -0700
366 Changes affecting future time stamps
368 Turks & Caicos is switching from US eastern time to UTC-4 year-round,
369 modeled as a switch from EST/EDT to AST on 2014-11-02 at 02:00.
370 [As noted in 2014j, this switch was later delayed.]
372 Changes affecting past time stamps
374 Time in Russia or the USSR before 1926 or so has been corrected by
375 a few seconds in the following zones: Asia/Irkutsk,
376 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi,
377 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For
378 Asia/Yekaterinburg the correction is a few minutes. (Thanks to
381 The Portuguese decree of 1911-05-26 took effect on 1912-01-01.
382 This affects 1911 time stamps in Africa/Bissau, Africa/Luanda,
383 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912
384 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32.
385 (Thanks to Stephen Colebourne for pointing to the decree.)
387 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59.
389 A new file 'backzone' contains data which may appeal to
390 connoisseurs of old time stamps, although it is out of scope for
391 the tz database, is often poorly sourced, and contains some data
392 that is known to be incorrect. The new file is not recommended
393 for ordinary use and its entries are not installed by default.
394 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and
395 Isle of Man entries.)
397 Some more zones have been turned into links, when they differed
398 from existing zones only for older time stamps. As usual,
399 these changes affect UTC offsets in pre-1970 time stamps only.
400 Their old contents have been moved to the 'backzone' file.
401 The affected zones are: Africa/Bangui, Africa/Brazzaville,
402 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
403 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
405 Changes affecting code
407 Unless NETBSD_INSPIRED is defined to 0, the tz library now
408 supplies functions for creating and using objects that represent
409 time zones. The new functions are tzalloc, tzfree, localtime_rz,
410 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
411 time2posix_z. They are intended for performance: for example,
412 localtime_rz (unlike localtime_r) is trivially thread-safe without
413 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired
414 functions, and to Alan Barrett and Jonathan Lennox for helping to
417 zdump now builds with the tz library unless USE_LTZ is defined to 0,
418 This lets zdump use tz features even if the system library lacks them.
419 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0
420 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
422 zdump now uses localtime_rz if available, as it's significantly faster,
423 and it can help zdump better diagnose invalid time zone names.
424 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ
425 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is
426 not available, zdump now uses localtime_r and tzset if available,
427 as this is a bit cleaner and faster than plain localtime. Compile
428 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
429 lacks these two functions.
431 If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
432 Although not needed for tz's own applications, which are single-threaded,
433 this supports POSIX better if the tz library is used in multithreaded apps.
435 Some crashes have been fixed when zdump or the tz library is given
436 invalid or outlandish input.
438 The tz library no longer mishandles leap seconds on platforms with
439 unsigned time_t in time zones that lack ordinary transitions after 1970.
441 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
442 already defined, to make it easier to configure on common platforms.
443 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
445 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
446 assumes that reading uninitialized memory yields garbage values
447 but does not cause other problems such as traps.
449 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now
450 more likely to guess right for ambiguous time stamps near
451 transitions where tm_isdst does not change.
453 If HAVE_STRFTIME_L is defined to 1, the tz library now defines
454 strftime_l for compatibility with recent versions of POSIX.
455 Only the C locale is supported, though. HAVE_STRFTIME_L defaults
456 to 1 on recent POSIX versions, and to 0 otherwise.
458 tzselect -c now uses a hybrid distance measure that works better
459 in Africa. (Thanks to Alan Barrett for noting the problem.)
461 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used,
462 or when time_tz is defined.
464 When HAVE_UTMPX_H is set the 'date' command now builds on systems
465 whose <utmpx.h> file does not define WTMPX_FILE, and when setting
466 the date it updates the wtmpx file if _PATH_WTMPX is defined.
467 This affects GNU/Linux and similar systems.
469 For easier maintenance later, some C code has been simplified,
470 some lint has been removed, and the code has been tweaked so that
471 plain 'make' is more likely to work.
473 The C type 'bool' is now used for boolean values, instead of 'int'.
475 The long-obsolete LOCALE_HOME code has been removed.
477 The long-obsolete 'gtime' function has been removed.
479 Changes affecting build procedure
481 'zdump' no longer links in ialloc.o, as it's not needed.
483 'make check_time_t_alternatives' no longer assumes GNU diff.
485 Changes affecting distribution tarballs
487 The files checktab.awk and zoneinfo2tdf.pl are now distributed in
488 the tzdata tarball instead of the tzcode tarball, since they help
489 maintain the data. The NEWS and Theory files are now also
490 distributed in the tzdata tarball, as they're relevant for data.
491 (Thanks to Alan Barrett for pointing this out.) Also, the
492 leapseconds.awk file is no longer distributed in the tzcode
493 tarball, since it belongs in the tzdata tarball (where 2014f
494 inadvertently also distributed it).
496 Changes affecting documentation and commentary
498 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for
499 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms
502 The man pages have been updated to use function prototypes,
503 to document thread-safe variants like localtime_r, and to document
504 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and
507 The fields in Link lines have been renamed to be more descriptive
508 and more like the parameters of 'ln'. LINK-FROM has become TARGET,
509 and LINK-TO has become LINK-NAME.
511 tz-link.htm mentions the IETF's tzdist working group; Windows
512 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
514 Some broken URLs have been fixed in the commentary. (Thanks to
517 Commentary about Philippines DST has been updated, and commentary
518 on pre-1970 time in India has been added.
521 Release 2014f - 2014-08-05 17:42:36 -0700
523 Changes affecting future time stamps
525 Russia will subtract an hour from most of its time zones on 2014-10-26
526 at 02:00 local time. (Thanks to Alexander Krivenyshev.)
527 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky
528 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug
529 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast
530 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic
531 (Europe/Samara) are not changing their clocks. The changed zones are
532 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd,
533 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk,
534 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga,
535 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours
536 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected,
537 but not its UTC offset. Two zones are added: Asia/Chita (split
538 from Asia/Yakutsk, and also with two hours subtracted) and
539 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour
540 subtracted). (Thanks to Tim Parenti for much of the above.)
542 Changes affecting time zone abbreviations
544 Australian eastern time zone abbreviations are now AEST/AEDT not EST,
545 and similarly for the other Australian zones. That is, for eastern
546 standard and daylight saving time the abbreviations are AEST and AEDT
547 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
548 and AWST/AWDT are now used instead of the former CST, CWST, and WST.
549 This change does not affect UTC offsets, only time zone abbreviations.
550 (Thanks to Rich Tibbett and many others.)
552 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UTC+7)
553 effective 2014-10-26 at 02:00 local time.
555 The time zone abbreviation for Xinjiang Time (observed in Ürümqi)
556 has been changed from URUT to XJT. (Thanks to Luther Ma.)
558 Prefer MSK/MSD for Moscow time in Russia, even in other cities.
559 Similarly, prefer EET/EEST for eastern European time in Russia.
561 Change time zone abbreviations in (western) Samoa to use "ST" and
562 "DT" suffixes, as this is more likely to match common practice.
563 Prefix "W" to (western) Samoa time when its standard-time offset
564 disagrees with that of American Samoa.
566 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone.
568 Time zone abbreviations have been updated for Japan's two time
569 zones used 1896-1937. JWST now stands for Western Standard
570 Time, and JCST for Central Standard Time (formerly this was CJT).
571 These abbreviations are now used for time in Korea, Taiwan,
572 and Sakhalin while controlled by Japan.
574 Changes affecting past time stamps
576 China's five zones have been simplified to two, since the post-1970
577 differences in the other three seem to have been imaginary. The
578 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been
579 removed; backwards-compatibility links still work, albeit with
580 different behaviors for time stamps before May 1980. Asia/Urumqi's
581 1980 transition to UTC+8 has been removed, so that it is now at
582 UTC+6 and not UTC+8. (Thanks to Luther Ma and to Alois Treindl;
583 Treindl sent helpful translations of two papers by Guo Qingsheng.)
585 Some zones have been turned into links, when they differed from existing
586 zones only for older UTC offsets where data entries were likely invented.
587 These changes affect UTC offsets in pre-1970 time stamps only. This is
588 similar to the change in release 2013e, except this time for western
589 Africa. The affected zones are: Africa/Bamako, Africa/Banjul,
590 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,
591 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and
592 Atlantic/St_Helena. This also affects the backwards-compatibility
593 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne,
594 Tim Parenti, and David Patte for reporting problems in earlier
595 versions of this change.)
597 Asia/Shanghai's pre-standard-time UT offset has been changed from
598 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its
599 transition to standard time has been changed from 1928 to 1901.
601 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01,
602 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945.
603 In 1946 it observed DST from 05-15 through 09-30; in 1947
604 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30.
605 (Thanks to Yu-Cheng Chuang.)
607 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950.
609 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not
610 10-03 at 00:00. (Thanks to Konstantin Hyppönen.)
612 Pacific/Pago_Pago has been changed from UTC-11:30 to UTC-11 for the period
615 Pacific/Chatham has been changed to New Zealand standard time plus
616 45 minutes for the period before 1957, reflecting a 1956 remark in
617 the New Zealand parliament.
619 Europe/Budapest has several pre-1946 corrections: in 1918 the transition
620 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in
621 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08
622 not 04-06 at 02:00; and there was no DST in 1920.
624 Africa/Accra is now assumed to have observed DST from 1920 through 1935.
626 Time in Russia before 1927 or so has been corrected by a few seconds in
627 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi,
628 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and
629 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0
630 point. (Thanks to Vladimir Karpinsky for the Moscow changes.)
632 Changes affecting data format
634 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data.
635 The new file's extended format allows multiple country codes per zone.
636 The older file is still installed but is deprecated; its format is
637 not changing and it will still be distributed for a while, but new
638 applications should use the new file.
640 The new file format simplifies maintenance of obscure locations.
641 To test this, it adds coverage for the Crozet Islands and the
642 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.)
644 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8.
645 It is still ASCII now, but commentary about the switch has been added.
646 The new file 'zone1970.tab' already uses UTF-8.
648 Changes affecting code
650 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE
651 is defined. (Thanks to Elliott Hughes for reporting the problem.)
653 'zic' no longer mishandles input when ignoring case in locales that
654 are not compatible with English, e.g., unibyte Turkish locales when
655 compiled with HAVE_GETTEXT.
657 Error diagnostics of 'zic' and 'yearistype' have been reworded so that
658 they no longer use ASCII '-' as if it were a dash.
660 'zic' now rejects output file names that contain '.' or '..' components.
661 (Thanks to Tim Parenti for reporting the problem.)
663 'zic -v' now warns about output file names that do not follow
664 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur
665 David Olson for starting the ball rolling on this.)
667 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0.
669 Changes affecting build procedure
671 'zic' no longer links in localtime.o and asctime.o, as they're not needed.
672 (Thanks to John Cochran.)
674 Changes affecting documentation and commentary
676 The 'Theory' file documents legacy names, the longstanding
677 exceptions to the POSIX-inspired file name rules.
679 The 'zic' documentation clarifies the role of time types when
680 interpreting dates. (Thanks to Arthur David Olson.)
682 Documentation and commentary now prefer UTF-8 to US-ASCII,
683 allowing the use of proper accents in foreign words and names.
684 Code and data have not changed because of this. (Thanks to
685 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug
688 Non-HTML documentation and commentary now use plain-text URLs instead of
689 HTML insertions, and are more consistent about bracketing URLs when they
690 are not already surrounded by white space. (Thanks to suggestions by
693 There is new commentary about Xujiahui Observatory, the five time-zone
694 project in China from 1918 to 1949, timekeeping in Japanese-occupied
695 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the
696 warlord Jin Shuren in the data.
698 Commentary about the coverage of each Russian zone has been standardized.
699 (Thanks to Tim Parenti).
701 There is new commentary about contemporary timekeeping in Ethiopia.
703 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed.
705 There is new commentary about time in Poland in 1919.
707 Proper credit has been given to DST inventor George Vernon Hudson.
709 Commentary about time in Metlakatla, AK and Resolute, NU has been
710 improved, with a new source for the former.
712 In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it
715 Commentary about permanent Antarctic bases has been updated.
717 Several typos have been corrected. (Thanks to Tim Parenti for
718 contributing some of these fixes.)
720 tz-link.htm now mentions the JavaScript libraries Moment Timezone,
721 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up
722 from Matt Johnson.) Also, it mentions the Go 'latlong' package.
723 (Thanks to a heads-up from Dirkjan Ochtman.)
725 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998
726 have been removed. These obsolescent US Naval Observatory entries were no
727 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.)
730 Release 2014e - 2014-06-12 21:53:52 -0700
732 Changes affecting near-future time stamps
734 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00.
735 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily
736 switch to standard time at 24:00 the last Thursday before Ramadan, and
737 back to DST at 00:00 the first Friday after Ramadan.
739 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks
740 to Milamber Space Network.) Guess that from 2015 on Morocco will
741 temporarily switch to standard time at 03:00 the last Saturday before
742 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan.
744 Changes affecting past time stamps
746 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of
747 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo
748 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time
749 in 1991. (Thanks to Hank W. for reporting the problems.)
751 Changes affecting commentary
753 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the
754 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and
755 removes stale pointers to World Time Explorer and WORLDTIME.
758 Release 2014d - 2014-05-27 21:34:40 -0700
760 Changes affecting code
762 zic no longer generates files containing time stamps before the Big Bang.
763 This works around GNOME bug 730332
764 <https://bugzilla.gnome.org/show_bug.cgi?id=730332>.
765 (Thanks to Leonardo Chiquitto for reporting the bug, and to
766 Arthur David Olson and James Cloos for suggesting improvements to the fix.)
768 Changes affecting documentation
770 tz-link.htm now mentions GNOME.
773 Release 2014c - 2014-05-13 07:44:13 -0700
775 Changes affecting near-future time stamps
777 Egypt observes DST starting 2014-05-15 at 24:00.
778 (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
779 Details have not been announced, except that DST will not be observed
780 during Ramadan. Guess that DST will stop during the same Ramadan dates as
781 Morocco, and that Egypt's future spring and fall transitions will be the
782 same as 2010 when it last observed DST, namely April's last Friday at
783 00:00 to September's last Thursday at 23:00 standard time. Also, guess
784 that Ramadan transitions will be at 00:00 standard time.
786 Changes affecting code
788 zic now generates transitions for minimum time values, eliminating guesswork
789 when handling low-valued time stamps. (Thanks to Arthur David Olson.)
791 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.)
793 Changes affecting commentary and documentation
795 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.)
798 Release 2014b - 2014-03-24 21:28:50 -0700
800 Changes affecting near-future time stamps
802 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time.
803 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU.
805 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and
806 Bengt-Inge Larsson.) This is currently an approximation; a better version
807 will require the zic and localtime fixes mentioned below, and the plan is
808 to wait for a while until at least the zic fixes propagate.
810 Changes affecting code
812 'zic' and 'localtime' no longer reject locations needing four transitions
813 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).)
814 Also, 'zic' avoids some unlikely failures due to integer overflow.
816 Changes affecting build procedure
818 'make check' now detects Rule lines defined but never used.
819 The NZAQ rules, an instance of this problem, have been removed.
821 Changes affecting commentary and documentation
823 Fix Tuesday/Thursday typo in description of time in Israel.
824 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.)
826 Microsoft Windows 8.1 doesn't support tz database names. (Thanks
827 to Donald MacQueen.) Instead, the Microsoft Windows Store app
828 library supports them.
830 Add comments about Johnston Island time in the 1960s.
831 (Thanks to Lyle McElhaney.)
833 Morocco's 2014 DST start will be as predicted.
834 (Thanks to Sebastien Willemijns.)
837 Release 2014a - 2014-03-07 23:30:29 -0800
839 Changes affecting near-future time stamps
841 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for
842 the heads-up, and to Tim Parenti for simplifying the update.)
844 Changes affecting past time stamps
846 Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00.
847 (Thanks to Steffen Thorsen.)
849 Ukraine switched from Moscow to Eastern European time on 1990-07-01
850 (not 1992-01-01), and observed DST during the entire next winter.
851 (Thanks to Vladimir in Moscow via Alois Treindl.)
853 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03.
854 (Thanks to Avigdor Finkelstein.)
856 Changes affecting code
858 A uninitialized-storage bug in 'localtime' has been fixed.
859 (Thanks to Logan Chien.)
861 Changes affecting the build procedure
863 The settings for 'make check_web' now default to Ubuntu 13.10.
865 Changes affecting commentary and documentation
867 The boundary of the US Pacific time zone is given more accurately.
868 (Thanks to Alan Mintz.)
870 Chile's 2014 DST will be as predicted. (Thanks to José Miguel Garrido.)
872 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Raúl Perasso.)
874 Better descriptions of countries with same time zone history as
875 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.)
877 Several changes affect tz-link.htm, the main web page.
879 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to
882 Mention xCal (Internet RFC 6321) and jCal.
884 Microsoft has some support for tz database names.
886 CLDR data formats include both XML and JSON.
888 Mention Maggiolo's map of solar vs standard time.
889 (Thanks to Arthur David Olson.)
891 Mention TZ4Net. (Thanks to Matt Johnson.)
893 Mention the timezone-olson Haskell package.
895 Mention zeitverschiebung.net. (Thanks to Martin Jäger.)
897 Remove moribund links to daylight-savings-time.info and to
898 Simple Timer + Clocks.
900 Update two links. (Thanks to Oscar van Vlijmen.)
902 Fix some formatting glitches, e.g., remove random newlines from
903 abbr elements' title attributes.
906 Release 2013i - 2013-12-17 07:25:23 -0800
908 Changes affecting near-future time stamps:
910 Jordan switches back to standard time at 00:00 on December 20, 2013.
911 The 2006-2011 transition schedule is planned to resume in 2014.
912 (Thanks to Steffen Thorsen.)
914 Changes affecting past time stamps:
916 In 2004, Cuba began DST on March 28, not April 4.
917 (Thanks to Steffen Thorsen.)
919 Changes affecting code
921 The compile-time flag NOSOLAR has been removed, as nowadays the
922 benefit of slightly shrinking runtime table size is outweighed by the
923 cost of disallowing potential future updates that exceed old limits.
925 Changes affecting documentation and commentary
927 The files solar87, solar88, and solar89 are no longer distributed.
928 They were a negative experiment - that is, a demonstration that
929 tz data can represent solar time only with some difficulty and error.
930 Their presence in the distribution caused confusion, as Riyadh
931 civil time was generally not solar time in those years.
933 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.)
936 Release 2013h - 2013-10-25 15:32:32 -0700
938 Changes affecting current and future time stamps:
940 Libya has switched its time zone back to UTC+2 without DST,
941 instead of UTC+1 with DST. (Thanks to Even Scharning.)
943 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules.
944 (Thanks to Gwillim Law.)
946 Changes affecting future time stamps:
948 Acre and (we guess) western Amazonas will switch from UTC-4 to UTC-5
949 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe.
950 (Thanks to Steffen Thorsen.)
952 Add entries for DST transitions in Morocco in the year 2038.
953 This avoids some year-2038 glitches introduced in 2013g.
954 (Thanks to Yoshito Umaoka for reporting the problem.)
956 Changes affecting API
958 The 'tzselect' command no longer requires the 'select' command,
959 and should now work with /bin/sh on more platforms. It also works
960 around a bug in BusyBox awk before version 1.21.0. (Thanks to
961 Patrick 'P. J.' McDermott and Alan Barrett.)
963 Changes affecting code
965 Fix localtime overflow bugs with 32-bit unsigned time_t.
967 zdump no longer assumes sscanf returns maximal values on overflow.
969 Changes affecting the build procedure
971 The builder can specify which programs to use, if any, instead of
972 'ar' and 'ranlib', and libtz.a is now built locally before being
973 installed. (Thanks to Michael Forney.)
975 A dependency typo in the 'zdump' rule has been fixed.
976 (Thanks to Andrew Paprocki.)
978 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f'
979 work as specified by POSIX.2-1992 or later; this is portable nowadays.
981 'make clean' no longer removes 'leapseconds', since it's
982 host-independent and is part of the distribution.
984 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed.
986 Changes affecting documentation and commentary
988 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol
989 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle).
991 Update URLs in tz-link page. Add URLs for Microsoft Windows, since
992 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no
993 longer maintained) and for old advisories. SOFA now does C.
995 Release 2013g - 2013-09-30 21:08:26 -0700
997 Changes affecting current and near-future time stamps
999 Morocco now observes DST from the last Sunday in March to the last
1000 Sunday in October, not April to September respectively. (Thanks
1001 to Steffen Thorsen.)
1003 Changes affecting 'zic'
1005 'zic' now runs on platforms that lack both hard links and symlinks.
1006 (Thanks to Theo Veenker for reporting the problem, for MinGW.)
1007 Also, fix some bugs on platforms that lack hard links but have symlinks.
1009 'zic -v' again warns that Asia/Tehran has no POSIX environment variable
1010 to predict the far future, fixing a bug introduced in 2013e.
1012 Changes affecting the build procedure
1014 The 'leapseconds' file is again put into the tzdata tarball.
1015 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to
1016 Matt Burgess and Ian Abbott.) The timestamps of these and other
1017 dependent files in tarballs are adjusted more consistently.
1019 Changes affecting documentation and commentary
1021 The README file is now part of the data tarball as well as the code.
1022 It now states that files are public domain unless otherwise specified.
1023 (Thanks to Andrew Main (Zefram) for asking for clarifications.)
1024 Its details about the 1989 release moved to a place of honor near
1028 Release 2013f - 2013-09-24 23:37:36 -0700
1030 Changes affecting near-future time stamps
1032 Tocantins will very likely not observe DST starting this spring.
1033 (Thanks to Steffen Thorsen.)
1035 Jordan will likely stay at UTC+3 indefinitely, and will not fall
1038 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.)
1040 Changes affecting API
1042 The types of the global variables 'timezone' and 'altzone' (if present)
1043 have been changed back to 'long'. This is required for 'timezone'
1044 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11.
1045 These variables were originally 'long' in the tz code, but were
1046 mistakenly changed to 'time_t' in 1987; nobody reported the
1047 incompatibility until now. The difference matters on x32, where
1048 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.)
1050 Changes affecting the build procedure
1052 Avoid long strings in leapseconds.awk to work around a mawk bug.
1053 (Thanks to Cyril Baurand.)
1055 Changes affecting documentation and commentary
1057 New file 'NEWS' that contains release notes like this one.
1059 Paraguay's law does not specify DST transition time; 00:00 is customary.
1060 (Thanks to Waldemar Villamayor-Venialbo.)
1062 Minor capitalization fixes.
1064 Changes affecting version-control only
1066 The experimental GitHub repository now contains annotated and
1067 signed tags for recent releases, e.g., '2013e' for Release 2013e.
1068 Releases are tagged starting with 2012e; earlier releases were
1069 done differently, and tags would either not have a simple name or
1070 not exactly match what was released.
1072 'make set-timestamps' is now simpler and a bit more portable.
1075 Release 2013e - 2013-09-19 23:50:04 -0700
1077 Changes affecting near-future time stamps
1079 This year Fiji will start DST on October 27, not October 20.
1080 (Thanks to David Wheeler for the heads-up.) For now, guess that
1081 Fiji will continue to spring forward the Sunday before the fourth
1084 Changes affecting current and future time zone abbreviations
1086 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian
1087 time zone abbreviations since 1932. (Thanks to George Ziegler,
1088 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and
1089 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura,
1090 Asia/Makassar, and Asia/Pontianak.
1092 Use ART (UTC-3, standard time), rather than WARST (also UTC-3, but
1093 daylight saving time) for San Luis, Argentina since 2009.
1095 Changes affecting Godthåb time stamps after 2037 if version mismatch
1097 Allow POSIX-like TZ strings where the transition time's hour can
1098 range from -167 through 167, instead of the POSIX-required 0
1099 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the
1100 new Fiji rules. This is a more-compact way to represent
1101 far-future time stamps for America/Godthab, America/Santiago,
1102 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem,
1103 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by
1104 this change. (Derived from a suggestion by Arthur David Olson.)
1106 Allow POSIX-like TZ strings where daylight saving time is in
1107 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western
1108 Argentina Summer Time all year. This supports a more-compact way
1109 to represent the 2013d data for America/Argentina/San_Luis.
1110 Because of the change for San Luis noted above this change does not
1111 affect the current data. (Thanks to Andrew Main (Zefram) for
1112 suggestions that improved this change.)
1114 Where these two TZ changes take effect, there is a minor extension
1115 to the tz file format in that it allows new values for the
1116 embedded TZ-format string, and the tz file format version number
1117 has therefore been increased from 2 to 3 as a precaution.
1118 Version-2-based client code should continue to work as before for
1119 all time stamps before 2038. Existing version-2-based client code
1120 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format
1121 files, and typically works in practice even for time stamps after
1122 2037; the only known exception is America/Godthab.
1124 Changes affecting time stamps before 1970
1126 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects
1127 some errors before 1947.
1129 Some zones have been turned into links, when they differ from existing
1130 zones only in older data entries that were likely invented or that
1131 differ only in LMT or transitions from LMT. These changes affect
1132 only time stamps before 1943. The affected zones are:
1133 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica,
1134 America/Grenada, America/Guadeloupe, America/Marigot,
1135 America/Montserrat, America/St_Barthelemy, America/St_Kitts,
1136 America/St_Lucia, America/St_Thomas, America/St_Vincent,
1137 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for
1138 confirming that the old Europe/Vaduz zone was wrong and the new
1139 link is better for WWII-era times.)
1141 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects
1142 America/Cayman, America/Jamaica and America/Grand_Turk time stamps
1145 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46.
1146 This affects Europe/Zurich time stamps from 1853 to 1894. (Thanks
1149 Change the date of the circa-1850 Zurich transition from 1849-09-12
1150 to 1853-07-16, overriding Shanks with data from Messerli about
1151 postal and telegraph time in Switzerland.
1153 Changes affecting time zone abbreviations before 1970
1155 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932,
1156 as Jakarta was called Batavia back then.
1158 Changes affecting API
1160 The 'zic' command now outputs a dummy transition when far-future
1161 data can't be summarized using a TZ string, and uses a 402-year
1162 window rather than a 400-year window. For the current data, this
1163 affects only the Asia/Tehran file. It does not affect any of the
1164 time stamps that this file represents, so zdump outputs the same
1165 information as before. (Thanks to Andrew Main (Zefram).)
1167 The 'date' command has a new '-r' option, which lets you specify
1168 the integer time to display, a la FreeBSD.
1170 The 'tzselect' command has two new options '-c' and '-n', which lets you
1171 select a zone based on latitude and longitude.
1173 The 'zic' command's '-v' option now warns about constructs that
1174 require the new version-3 binary file format. (Thanks to Arthur
1175 David Olson for the suggestion.)
1177 Support for floating-point time_t has been removed.
1178 It was always dicey, and POSIX no longer requires it.
1179 (Thanks to Eric Blake for suggesting to the POSIX committee to
1180 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy
1181 Heninger, Arthur David Olson, and Alois Treindl, for reporting
1182 bugs and elucidating some of the corners of the old floating-point
1185 The signatures of 'offtime', 'timeoff', and 'gtime' have been
1186 changed back to the old practice of using 'long' to represent UT
1187 offsets. This had been inadvertently and mistakenly changed to
1188 'int_fast32_t'. (Thanks to Christos Zoulas.)
1190 The code avoids undefined behavior on integer overflow in some
1191 more places, including gmtime, localtime, mktime and zdump.
1193 Changes affecting the zdump utility
1195 zdump now outputs "UT" when referring to Universal Time, not "UTC".
1196 "UTC" does not make sense for time stamps that predate the introduction
1197 of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen
1198 for clarifying UT vs UTC.)
1200 Data changes affecting behavior of tzselect and similar programs
1202 Country code BQ is now called the more-common name "Caribbean Netherlands"
1203 rather than the more-official "Bonaire, St Eustatius & Saba".
1205 Remove from zone.tab the names America/Montreal, America/Shiprock,
1206 and Antarctica/South_Pole, as they are equivalent to existing
1207 same-country-code zones for post-1970 time stamps. The data entries for
1208 these names are unchanged, so the names continue to work as before.
1210 Changes affecting code internals
1212 zic -c now runs way faster on 64-bit hosts when given large numbers.
1214 zic now uses vfprintf to avoid allocating and freeing some memory.
1216 tzselect now computes the list of continents from the data,
1217 rather than have it hard-coded.
1219 Minor changes pacify GCC 4.7.3 and GCC 4.8.1.
1221 Changes affecting the build procedure
1223 The 'leapseconds' file is now generated automatically from a
1224 new file 'leap-seconds.list', which is a copy of
1225 <ftp://time.nist.gov/pub/leap-seconds.list>.
1226 A new source file 'leapseconds.awk' implements this.
1227 The goal is simplification of the future maintenance of 'leapseconds'.
1229 When building the 'posix' or 'right' subdirectories, if the
1230 subdirectory would be a copy of the default subdirectory, it is
1231 now made a symbolic link if that is supported. This saves about
1232 2 MB of file system space.
1234 The links America/Shiprock and Antarctica/South_Pole have been
1235 moved to the 'backward' file. This affects only nondefault builds
1236 that omit 'backward'.
1238 Changes affecting version-control only
1240 .gitignore now ignores 'date'.
1242 Changes affecting documentation and commentary
1244 Changes to the 'tzfile' man page
1246 It now mentions that the binary file format may be extended in
1247 future versions by appending data.
1249 It now refers to the 'zdump' and 'zic' man pages.
1251 Changes to the 'zic' man page
1253 It lists conditions that elicit a warning with '-v'.
1255 It says that the behavior is unspecified when duplicate names
1256 are given, or if the source of one link is the target of another.
1258 Its examples are updated to match the latest data.
1260 The definition of white space has been clarified slightly.
1261 (Thanks to Michael Deckers.)
1263 Changes to the 'Theory' file
1265 There is a new section about the accuracy of the tz database,
1266 describing the many ways that errors can creep in, and
1267 explaining why so many of the pre-1970 time stamps are wrong or
1268 misleading (thanks to Steve Allen, Lester Caine, and Garrett
1269 Wollman for discussions that contributed to this).
1271 The 'Theory' file describes LMT better (this follows a
1272 suggestion by Guy Harris).
1274 It refers to the 2013 edition of POSIX rather than the 2004 edition.
1276 It's mentioned that excluding 'backward' should not affect the
1277 other data, and it suggests at least one zone.tab name per
1278 inhabited country (thanks to Stephen Colebourne).
1280 Some longstanding restrictions on names are documented, e.g.,
1281 'America/New_York' precludes 'America/New_York/Bronx'.
1283 It gives more reasons for the 1970 cutoff.
1285 It now mentions which time_t variants are supported, such as
1286 signed integer time_t. (Thanks to Paul Goyette for reporting
1287 typos in an experimental version of this change.)
1289 (Thanks to Philip Newton for correcting typos in these changes.)
1291 Documentation and commentary is more careful to distinguish UT in
1292 general from UTC in particular. (Thanks to Steve Allen.)
1294 Add a better source for the Zurich 1894 transition.
1295 (Thanks to Pierre-Yves Berger.)
1297 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.)
1300 Release 2013d - 2013-07-05 07:38:01 -0700
1302 Changes affecting future time stamps:
1304 Morocco's midsummer transitions this year are July 7 and August 10,
1305 not July 9 and August 8. (Thanks to Andrew Paprocki.)
1307 Israel now falls back on the last Sunday of October.
1308 (Thanks to Ephraim Silverberg.)
1310 Changes affecting past time stamps:
1312 Specify Jerusalem's location more precisely; this changes the pre-1880
1315 Changing affecting metadata only:
1317 Fix typos in the entries for country codes BQ and SX.
1319 Changes affecting code:
1321 Rework the code to fix a bug with handling Australia/Macquarie on
1322 32-bit hosts (thanks to Arthur David Olson).
1324 Port to platforms like NetBSD, where time_t can be wider than long.
1326 Add support for testing time_t types other than the system's.
1327 Run 'make check_time_t_alternatives' to try this out.
1328 Currently, the tests fail for unsigned time_t;
1329 this should get fixed at some point.
1331 Changes affecting documentation and commentary:
1333 Deemphasize the significance of national borders.
1335 Update the zdump man page.
1337 Remove obsolete NOID comment (thanks to Denis Excoffier).
1339 Update several URLs and comments in the web pages.
1341 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler).
1343 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka).
1346 Release 2013c - 2013-04-19 16:17:40 -0700
1348 Changes affecting current and future time stamps:
1350 Palestine observed DST starting March 29, 2013. (Thanks to
1351 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST,
1352 with the predicted rules being the last Thursday in March at 24:00
1353 to the first Friday on or after September 21 at 01:00.
1355 Assume that the recent change to Paraguay's DST rules is permanent,
1356 by moving the end of DST to the 4th Sunday in March every year.
1357 (Thanks to Carlos Raúl Perasso.)
1359 Changes affecting past time stamps:
1361 Fix some historical data for Palestine to agree with that of
1362 timeanddate.com, as follows:
1364 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not
1367 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not
1370 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27.
1372 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2.
1374 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01.
1376 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00.
1378 Fix times of habitation for Macquarie to agree with the Tasmania
1379 Parks & Wildlife Service history, which indicates that permanent
1380 habitation was 1899-1919 and 1948 on.
1382 Changing affecting metadata only:
1384 Macquarie Island is politically part of Australia, not Antarctica.
1385 (Thanks to Tobias Conradi.)
1387 Sort Macquarie more-consistently with other parts of Australia.
1388 (Thanks to Tim Parenti.)
1391 Release 2013b - 2013-03-10 22:33:40 -0700
1393 Changes affecting current and future time stamps:
1395 Haiti uses US daylight-saving rules this year, and presumably future years.
1396 This changes time stamps starting today. (Thanks to Steffen Thorsen.)
1398 Paraguay will end DST on March 24 this year.
1399 (Thanks to Steffen Thorsen.) For now, assume it's just this year.
1401 Morocco does not observe DST during Ramadan;
1402 try to predict Ramadan in Morocco as best we can.
1403 (Thanks to Erik Homoet for the heads-up.)
1405 Changes affecting commentary:
1407 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS.
1408 Update URL for Solaris. Mention Internet RFC 6557.
1409 Update Internet RFCs 2445->5545, 2822->5322.
1410 Switch from FTP to HTTP for Internet RFCs.
1413 Release 2013a - 2013-02-27 09:20:35 -0800
1415 Change affecting binary data format:
1417 The zone offset at the end of version-2-format zone files is now
1418 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.)
1420 Changes affecting current and future time stamps:
1422 Chile's 2013 rules, and we guess rules for 2014 and later, will be
1423 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC.
1424 (Thanks to Steffen Thorsen and Robert Elz.)
1426 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen.
1427 (Thanks to Tobias Conradi and Arthur David Olson.)
1429 Many changes affect historical time stamps before 1940.
1430 These were deduced from: Milne J. Civil time. Geogr J. 1899
1431 Feb;13(2):173-94 <http://www.jstor.org/stable/1774359>.
1433 Changes affecting the code:
1435 Fix zic bug that mishandled Egypt's 2010 changes (this also affected
1436 the data). (Thanks to Arthur David Olson.)
1438 Fix localtime bug when time_t is unsigned and data files were generated
1439 by a signed time_t system. (Thanks to Doug Bailey for reporting and
1440 to Arthur David Olson for fixing.)
1442 Allow the email address for bug reports to be set by the packager.
1443 The default is tz@iana.org, as before. (Thanks to Joseph S. Myers.)
1445 Update HTML checking to be compatible with Ubuntu 12.10.
1447 Check that files are a safe subset of ASCII. At some point we may
1448 relax this requirement to a safe subset of UTF-8. Without the
1449 check, some non-UTF-8 encodings were leaking into the distribution.
1453 Restore a comment about copyright notices that was inadvertently deleted.
1454 (Thanks to Arthur David Olson.)
1456 Improve the commentary about which districts observe what times
1457 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson).
1459 Add web page links to tz.js.
1461 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.)
1464 Release 2012j - 2012-11-12 18:34:49 -0800
1466 Libya moved to CET this weekend, but with DST planned next year.
1467 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.)
1469 Signatures now have the extension .asc, not .sign, as that's more
1470 standard. (Thanks to Phil Pennock.)
1472 The output of 'zdump --version', and of 'zic --version', now
1473 uses a format that is more typical for --version.
1474 (Thanks to Joseph S. Myers.)
1476 The output of 'tzselect --help', 'zdump --help', and 'zic --help'
1477 now uses tz@iana.org rather than the old elsie address.
1479 zic -v now complains about abbreviations that are less than 3
1480 or more than 6 characters, as per Posix. Formerly, it checked
1481 for abbreviations that were more than 3.
1483 'make public' no longer puts its temporary directory under /tmp,
1484 and uses the just-built zic rather than the system zic.
1486 Various fixes to documentation and commentary.
1489 Release 2012i - 2012-11-03 12:57:09 -0700
1491 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.)
1493 Linker flags can now be specified via LDFLAGS.
1494 AWK now defaults to 'awk', not 'nawk'.
1495 The shell in tzselect now defaults to /bin/bash, but this can
1496 be overridden by specifying KSHELL.
1497 The main web page now mentions the unofficial GitHub repository.
1498 (Thanks to Mike Frysinger.)
1500 Tarball signatures can now be built by running 'make signatures'.
1501 There are also new makefile rules 'tarballs', 'check_public', and
1502 separate makefile rules for each tarball and signature file.
1503 A few makefile rules are now more portable to strict POSIX.
1505 The main web page now lists the canonical IANA URL.
1508 Release 2012h - 2012-10-26 22:49:10 -0700
1510 Bahia no longer has DST. (Thanks to Kelley Cook.)
1512 Tocantins has DST. (Thanks to Rodrigo Severo.)
1514 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.)
1516 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.)
1520 More C modernization, except that at Arthur David Olson's suggestion
1521 the instances of 'register' were kept.
1524 Release 2012g - 2012-10-17 20:59:45 -0700
1526 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.)
1528 Palestine fall 2012. (Thanks to Steffen Thorsen.)
1532 To attack the version-number problem, this release ships the file
1533 'Makefile' (which contains the release number) in both the tzcode and
1534 the tzdata tarballs. The two Makefiles are identical, and should be
1535 identical in any matching pair of tarballs, so it shouldn't matter
1536 which order you extract the tarballs. Perhaps we can come up with a
1537 better version-number scheme at some point; this scheme does have the
1538 virtue of not adding more files.
1541 Release 2012f - 2012-09-12 23:17:03 -0700
1543 * australasia (Pacific/Fiji): Fiji DST is October 21 through January
1544 20 this year. (Thanks to Steffen Thorsen.)
1547 Release 2012e - 2012-08-02 20:44:55 -0700
1549 * australasia (Pacific/Fakaofo): Tokelau is UTC+13, not UTC+14.
1550 (Thanks to Steffen Thorsen.)
1552 * Use a single version number for both code and data.
1554 * .gitignore: New file.
1556 * Remove trailing white space.
1559 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700
1561 Changes for Morocco's time stamps, which take effect in a couple of
1562 hours, along with infrastructure changes to accommodate how the tz
1563 code and data are released on IANA.
1566 Release data2012c - 2012-03-27 12:17:25 -0400
1569 Summer time changes for Morocco (to start late April 2012)
1572 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria
1575 Haiti following US/Canada rules for 2012 (and we're assuming,
1576 for now anyway, for the future).
1579 Release 2012b - 2012-03-02 12:29:15 +0700
1581 There is just one change to tzcode2012b (compared with 2012a):
1582 the Makefile that was accidentally included with 2012a has been
1583 replaced with the version that should have been there, which is
1584 identical with the previous version (from tzcode2011i).
1586 There are just two changes in tzdata2012b compared with 2012a.
1588 Most significantly, summer time in Cuba has been delayed 3 weeks
1589 (now starts April 1 rather than March 11). Since Mar 11 (the old start
1590 date, as listed in 2012a) is just a little over a week away, this
1593 Less importantly, an excess tab in one of the changes in zone.tab
1594 in 2012a has been removed.
1597 Release 2012a - 2012-03-01 18:28:10 +0700
1599 The changes in tzcode2012a (compared to the previous version, 2011i)
1600 are entirely to the README and tz-art.htm and tz-link.htm files, if
1601 none of those concern you, you can ignore the code update. The changes
1602 reflect the changed addresses for the mailing list and the code and
1603 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile
1604 has been added to tz-link.htm).
1606 In tzdata2012a (compared to the previous release, which was 2011n)
1607 the major changes are:
1608 Chile 2011/2012 and 2012/2013 summer time date adjustments.
1609 Falkland Islands onto permanent summer time (we're assuming for the
1610 foreseeable future, though 2012 is all we're fairly certain of.)
1611 Armenia has abolished Summer Time.
1612 Tokelau jumped the International Date Line back last December
1613 (just the same as their near neighbour, Samoa).
1614 America/Creston is a new zone for a small area of British Columbia
1615 There will be a leapsecond 2012-06-30 23:59:60 UTC.
1617 Other minor changes are:
1618 Corrections to 1918 Canadian summer time end dates.
1619 Updated URL for UK time zone history (in comments)
1620 A few typos in Le Corre's list of free French place names (comments)
1623 Release data2011n - 2011-10-30 14:57:54 +0700
1625 There are three changes of note - most urgently, Cuba (America/Havana)
1626 has extended summer time by two weeks, now to end on Nov 13, rather than
1627 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic
1628 (Europe/Tiraspol) decided not to split from the rest of Moldova after
1629 all, and consequently that zone has been removed (again) and reinstated
1630 in the "backward" file as a link to Europe/Chisinau. And third, the
1631 end date for Fiji's summer time this summer was moved forward from the
1632 earlier planned Feb 26, to Jan 22.
1634 Apart from that, Moldova (MD) returns to a single entry in zone.tab
1635 (and the incorrect syntax that was in the 2011m version of that file
1636 is so fixed - it would have been fixed in a different way had this
1637 change not happened - that's the "missing" sccs version id).
1640 Release data2011m - 2011-10-24 21:42:16 +0700
1642 In particular, the typos in comments in the data (2011-11-17 should have
1643 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that
1644 Tim Parenti noted) have been fixed, and the change for Ukraine has been
1645 made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to
1646 Tim Parenti, and also Denys Gavrysh)
1648 In addition, I added Europe/Tiraspol to zone.tab.
1650 This time, all the files have new version numbers... (including the files
1651 otherwise unchanged in 2011m that were changed in 2011l but didn't get new
1652 version numbers there...)
1655 Release data2011l - 2011-10-10 11:15:43 +0700
1657 There are just 2 changes that cause different generated tzdata files from
1658 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil
1659 is included, but commented out. Compared with the diff I sent out last week,
1660 this version also includes attributions for the sources for the changes
1661 (in much the same format as ado used, but the html tags have not been
1662 checked, verified, or used in any way at all, so if there are errors there,
1663 please let me know.)
1666 Release data2011k - 2011-09-20 17:54:03 -0400
1671 Release data2011j - 2011-09-12 09:22:49 -0400
1673 (contemporary changes for Samoa; past changes for Kenya, Uganda, and
1674 Tanzania); there are also two spelling corrections to comments in
1675 the australasia file (with thanks to Christos Zoulas).
1678 Release 2011i - 2011-08-29 05:56:32 -0400
1683 Release data2011h - 2011-06-15 18:41:48 -0400
1685 Russia and Curaçao changes
1688 Release 2011g - 2011-04-25 09:07:22 -0400
1690 update the rules for Egypt to reflect its abandonment of DST this year
1693 Release 2011f - 2011-04-06 17:14:53 -0400
1698 Release 2011e - 2011-03-31 16:04:38 -0400
1700 Morocco, Chile, and tz-link changes
1703 Release 2011d - 2011-03-14 09:18:01 -0400
1705 changes that impact present-day time stamps in Cuba, Samoa, and Turkey
1708 Release 2011c - 2011-03-07 09:30:09 -0500
1710 These do affect current time stamps in Chile and Annette Island, Canada.
1713 Release 2011b - 2011-02-07 08:44:50 -0500
1718 Release 2011a - 2011-01-24 10:30:16 -0500
1723 Release data2010o - 2010-11-01 09:18:23 -0400
1725 change to the end of DST in Fiji in 2011
1728 Release 2010n - 2010-10-25 08:19:17 -0400
1733 Release 2010m - 2010-09-27 09:24:48 -0400
1735 Hong Kong, Vostok, and zic.c changes
1738 Release 2010l - 2010-08-16 06:57:25 -0400
1743 Release 2010k - 2010-07-26 10:42:27 -0400
1748 Release 2010j - 2010-05-10 09:07:48 -0400
1750 changes for Bahía de Banderas and for version naming
1753 Release data2010i - 2010-04-16 18:50:45 -0400
1755 the end of DST in Morocco on 2010-08-08
1758 Release data2010h - 2010-04-05 09:58:56 -0400
1763 Release data2010g - 2010-03-24 11:14:53 -0400
1768 Release 2010f - 2010-03-22 09:45:46 -0400
1773 Release data2010e - 2010-03-08 14:24:27 -0500
1775 corrects the Dhaka bug found by Danvin Ruangchan
1778 Release data2010d - 2010-03-06 07:26:01 -0500
1783 Release 2010c - 2010-03-01 09:20:58 -0500
1785 changes including KRE's suggestion for earlier initialization of
1786 "goahead" and "goback" structure elements
1789 Release code2010a - 2010-02-16 10:40:04 -0500
1794 Release data2010b - 2010-01-20 12:37:01 -0500
1799 Release data2010a - 2010-01-18 08:30:04 -0500
1804 Release data2009u - 2009-12-26 08:32:28 -0500
1806 changes to DST in Bangladesh
1809 Release 2009t - 2009-12-21 13:24:27 -0500
1814 Release data2009s - 2009-11-14 10:26:32 -0500
1816 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change
1819 Release 2009r - 2009-11-09 10:10:31 -0500
1821 "antarctica" and "tz-link.htm" changes
1824 Release 2009q - 2009-11-02 09:12:40 -0500
1826 with two corrections as reported by Eric Muller and Philip Newton
1829 Release data2009p - 2009-10-23 15:05:27 -0400
1831 Argentina (including San Luis) changes (with the correction from
1835 Release data2009o - 2009-10-14 16:49:38 -0400
1837 Samoa (commentary only), Pakistan, and Bangladesh changes
1840 Release data2009n - 2009-09-22 15:13:38 -0400
1842 added commentary for Argentina and a change to the end of DST in
1846 Release data2009m - 2009-09-03 10:23:43 -0400
1848 Samoa and Palestine changes
1851 Release data2009l - 2009-08-14 09:13:07 -0400
1853 Samoa (comments only) and Egypt
1856 Release 2009k - 2009-07-20 09:46:08 -0400
1861 Release data2009j - 2009-06-15 06:43:59 -0400
1863 Bangladesh change (with a short turnaround since the DST change is
1867 Release 2009i - 2009-06-08 09:21:22 -0400
1869 updating for DST in Bangladesh this year
1872 Release 2009h - 2009-05-26 09:19:14 -0400
1877 Release data2009g - 2009-04-20 16:34:07 -0400
1882 Release data2009f - 2009-04-10 11:00:52 -0400
1884 correct DST in Pakistan
1887 Release 2009e - 2009-04-06 09:08:11 -0400
1892 Release 2009d - 2009-03-23 09:38:12 -0400
1894 Morocco, Tunisia, Argentina, and American Astronomical Society changes
1897 Release data2009c - 2009-03-16 09:47:51 -0400
1899 change to the start of Cuban DST
1902 Release 2009b - 2009-02-09 11:15:22 -0500
1907 Release 2009a - 2009-01-21 10:09:39 -0500
1912 Release data2008i - 2008-10-21 12:10:25 -0400
1914 southamerica and zone.tab files, with Argentina DST rule changes and
1915 United States zone reordering and recommenting
1918 Release 2008h - 2008-10-13 07:33:56 -0400
1923 Release 2008g - 2008-10-06 09:03:18 -0400
1925 Fix a broken HTML anchor and update Brazil's DST transitions;
1926 there's also a slight reordering of information in tz-art.htm.
1929 Release data2008f - 2008-09-09 22:33:26 -0400
1934 Release 2008e - 2008-07-28 14:11:17 -0400
1936 changes by Arthur David Olson and Jesper Nørgaard Welen
1939 Release data2008d - 2008-07-07 09:51:38 -0400
1941 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo
1944 Release data2008c - 2008-05-19 17:48:03 -0400
1946 Pakistan, Morocco, and Mongolia
1949 Release data2008b - 2008-03-24 08:30:59 -0400
1951 including renaming Asia/Calcutta to Asia/Kolkata, with a backward
1955 Release 2008a - 2008-03-08 05:42:16 -0500
1960 Release 2007k - 2007-12-31 10:25:22 -0500
1962 most importantly, changes to the "southamerica" file based on
1963 Argentina's readoption of daylight saving time
1966 Release 2007j - 2007-12-03 09:51:01 -0500
1968 1. eliminate the "P" (parameter) macro;
1970 2. the "noncontroversial" changes circulated on the time zone
1971 mailing list (less the changes to "logwtmp.c");
1973 3. eliminate "too many transition" errors when "min" is used in time
1976 4. changes by Paul Eggert (including updated information for Venezuela).
1979 Release data2007i - 2007-10-30 10:28:11 -0400
1981 changes for Cuba and Syria
1984 Release 2007h - 2007-10-01 10:05:51 -0400
1986 changes by Paul Eggert, as well as an updated link to the ICU
1987 project in tz-link.htm
1990 Release 2007g - 2007-08-20 10:47:59 -0400
1992 changes by Paul Eggert
1994 The "leapseconds" file has been updated to incorporate the most
1995 recent International Earth Rotation and Reference Systems Service
1998 There's an addition to tz-art.htm regarding the television show "Medium".
2001 Release 2007f - 2007-05-07 10:46:46 -0400
2003 changes by Paul Eggert (including Haiti, Turks and Caicos, and New
2006 changes to zic.c to allow hour values greater than 24 (along with
2007 Paul's improved time value overflow checking)
2010 Release 2007e - 2007-04-02 10:11:52 -0400
2012 Syria and Honduras changes by Paul Eggert
2014 zic.c variable renaming changes by Arthur David Olson
2017 Release 2007d - 2007-03-20 08:48:30 -0400
2019 changes by Paul Eggert
2021 the elimination of white space at the ends of lines
2024 Release 2007c - 2007-02-26 09:09:37 -0500
2026 changes by Paul Eggert
2029 Release 2007b - 2007-02-12 09:34:20 -0500
2031 Paul Eggert's proposed change to the quotation handling logic in zic.c.
2033 changes to the commentary in "leapseconds" reflecting the IERS
2034 announcement that there is to be no positive leap second at the end
2038 Release 2007a - 2007-01-08 12:28:29 -0500
2040 changes by Paul Eggert
2042 Derick Rethan's Asmara change
2044 Oscar van Vlijmen's Easter Island local mean time change
2046 symbolic link changes
2049 Release 2006p - 2006-11-27 08:54:27 -0500
2051 changes by Paul Eggert
2054 Release 2006o - 2006-11-06 09:18:07 -0500
2056 changes by Paul Eggert
2059 Release 2006n - 2006-10-10 11:32:06 -0400
2061 changes by Paul Eggert
2064 Release 2006m - 2006-10-02 15:32:35 -0400
2066 changes for Uruguay, Palestine, and Egypt by Paul Eggert
2068 (minimalist) changes to zic.8 to clarify "until" information
2071 Release data2006l - 2006-09-18 12:58:11 -0400
2073 Paul's best-effort work on this coming weekend's Egypt time change
2076 Release 2006k - 2006-08-28 12:19:09 -0400
2078 changes by Paul Eggert
2081 Release 2006j - 2006-08-21 09:56:32 -0400
2083 changes by Paul Eggert
2086 Release code2006i - 2006-08-07 12:30:55 -0400
2090 Ken Pizzini's conversion script
2093 Release code2006h - 2006-07-24 09:19:37 -0400
2095 adds public domain notices to four files
2097 includes a fix for transition times being off by a second
2099 adds a new recording to the "arts" file (information courtesy Colin Bowern)
2102 Release 2006g - 2006-05-08 17:18:09 -0400
2104 northamerica changes by Paul Eggert
2107 Release 2006f - 2006-05-01 11:46:00 -0400
2109 a missing version number problem is fixed (with thanks to Bradley
2110 White for catching the problem)
2113 Release 2006d - 2006-04-17 14:33:43 -0400
2115 changes by Paul Eggert
2117 added new items to tz-arts.htm that were found by Paul
2120 Release 2006c - 2006-04-03 10:09:32 -0400
2122 two sets of data changes by Paul Eggert
2124 a fencepost error fix in zic.c
2126 changes to zic.c and the "europe" file to minimize differences
2127 between output produced by the old 32-bit zic and the new 64-bit
2131 Release 2006b - 2006-02-20 10:08:18 -0500
2132 [tz32code2006b + tz64code2006b + tzdata2006b]
2136 All SCCS IDs were bumped to "8.1" for this release.
2139 Release 2006a - 2006-01-30 08:59:31 -0500
2141 changes by Paul Eggert (in particular, Indiana time zone moves)
2143 an addition to the zic manual page to describe how special-case
2144 transitions are handled
2147 Release 2005r - 2005-12-27 09:27:13 -0500
2149 Canadian changes by Paul Eggert
2151 They also add "<pre>" directives to time zone data files and reflect
2152 changes to warning message logic in "zdump.c" (but with calls to
2153 "gettext" kept unbundled at the suggestion of Ken Pizzini).
2156 Release 2005q - 2005-12-13 09:17:09 -0500
2158 Nothing earth-shaking here:
2159 1. Electronic mail addresses have been removed.
2160 2. Casts of the return value of exit have been removed.
2161 3. Casts of the argument of is.* macros have been added.
2162 4. Indentation in one section of zic.c has been fixed.
2163 5. References to dead URLs in the data files have been dealt with.
2166 Release 2005p - 2005-12-05 10:30:53 -0500
2168 "systemv", "tz-link.htm", and "zdump.c" changes
2169 (less the casts of arguments to the is* macros)
2172 Release 2005o - 2005-11-28 10:55:26 -0500
2174 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert
2176 zdump.c lint fixes by Arthur David Olson
2179 Release 2005n - 2005-10-03 09:44:09 -0400
2181 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan
2185 Release 2005m - 2005-08-29 12:15:40 -0400
2187 changes by Paul Eggert (with a small tweak to the tz-art change)
2189 a declaration of an unused variable has been removed from zdump.c
2192 Release 2005l - 2005-08-22 12:06:39 -0400
2194 changes by Paul Eggert
2196 overflow/underflow checks by Arthur David Olson, minus changes to
2197 the "Theory" file about the pending addition of 64-bit data (I grow
2198 less confident of the changes being accepted with each passing day,
2199 and the changes no longer increase the data files nine-fold--there's
2200 less than a doubling in size by my local Sun's reckoning)
2203 Release 2005k - 2005-07-14 14:14:24 -0400
2205 The "leapseconds" file has been edited to reflect the recently
2206 announced leap second at the end of 2005.
2208 I've also deleted electronic mail addresses from the files as an
2212 Release 2005j - 2005-06-13 14:34:13 -0400
2214 These reflect changes to limit the length of time zone abbreviations
2215 and the characters used in those abbreviations.
2217 There are also changes to handle POSIX-style "quoted" time zone
2218 environment variables.
2220 The changes were circulated on the time zone mailing list; the only
2221 change since then was the removal of a couple of minimum-length of
2222 abbreviation checks.
2225 Release data2005i - 2005-04-21 15:04:16 -0400
2227 changes (most importantly to Nicaragua and Haiti) by Paul Eggert
2230 Release 2005h - 2005-04-04 11:24:47 -0400
2232 changes by Paul Eggert
2234 minor changes to Makefile and zdump.c to produce more useful output
2235 when doing a "make typecheck"
2238 Release 2005g - 2005-03-14 10:11:21 -0500
2240 changes by Paul Eggert (a change to current DST rules in Uruguay and
2241 an update to a link to time zone software)
2244 Release 2005f - 2005-03-01 08:45:32 -0500
2246 data and documentation changes by Paul Eggert
2249 Release 2005e - 2005-02-10 15:59:44 -0500
2254 Release code2005d - 2005-01-31 09:21:47 -0500
2256 make zic complain about links to links if the -v flag is used
2258 have "make public" do more code checking
2260 add an include to "localtime.c" for the benefit of gcc systems
2263 Release 2005c - 2005-01-17 18:36:29 -0500
2265 get better results when mktime runs on a system where time_t is double
2267 changes to the data files (most importantly to Paraguay)
2270 Release 2005b - 2005-01-10 09:19:54 -0500
2272 Get localtime and gmtime working on systems with exotic time_t types.
2274 Update the leap second commentary in the "leapseconds" file.
2277 Release 2005a - 2005-01-01 13:13:44 -0500
2282 Release code2004i - 2004-12-14 13:42:58 -0500
2284 Deal with systems where time_t is unsigned.
2287 Release code2004h - 2004-12-07 11:40:18 -0500
2289 64-bit-time_t changes
2292 Release 2004g - 2004-11-02 09:06:01 -0500
2294 update to Cuba (taking effect this weekend)
2296 other changes by Paul Eggert
2298 correction of the spelling of Oslo
2300 changed versions of difftime.c and private.h
2303 Release code2004f - 2004-10-21 10:25:22 -0400
2305 Cope with wide-ranging tm_year values.
2308 Release 2004e - 2004-10-11 14:47:21 -0400
2310 Brazil/Argentina/Israel changes by Paul Eggert
2312 changes to tz-link.htm by Paul
2314 one small fix to Makefile
2317 Release 2004d - 2004-09-22 08:27:29 -0400
2319 Avoid overflow problems when TM_YEAR_BASE is added to an integer.
2322 Release 2004c - 2004-08-11 12:06:26 -0400
2324 asctime-related changes
2326 (variants of) some of the documentation changes suggested by Paul Eggert
2329 Release 2004b - 2004-07-19 14:33:35 -0400
2331 data changes by Paul Eggert - most importantly, updates for Argentina
2334 Release 2004a - 2004-05-27 12:00:47 -0400
2336 changes by Paul Eggert
2338 Handle DST transitions that occur at the end of a month in some
2339 years but at the start of the following month in other years.
2341 Add a copy of the correspondence that's the basis for claims about
2342 DST in the Navajo Nation.
2345 Release 2003e - 2003-12-15 09:36:47 -0500
2347 changes by Arthur David Olson (primarily code changes)
2349 changes by Paul Eggert (primarily data changes)
2351 minor changes to "Makefile" and "northamerica" (in the latter case,
2352 optimization of the "Toronto" rules)
2355 Release 2003d - 2003-10-06 09:34:44 -0400
2357 changes by Paul Eggert
2360 Release 2003c - 2003-09-16 10:47:05 -0400
2362 Fix bad returns in zic.c's inleap function.
2363 Thanks to Bradley White for catching the problem!
2366 Release 2003b - 2003-09-16 07:13:44 -0400
2368 Add a "--version" option (and documentation) to the zic and zdump commands.
2370 changes to overflow/underflow checking in zic
2372 a localtime typo fix.
2374 Update the leapseconds and tz-art.htm files.
2377 Release 2003a - 2003-03-24 09:30:54 -0500
2379 changes by Paul Eggert
2381 a few additions and modifications to the tz-art.htm file
2384 Release 2002d - 2002-10-15 13:12:42 -0400
2386 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab
2388 There's also a new time zone quote in "tz-art.htm".
2391 Release 2002c - 2002-04-04 11:55:20 -0500
2393 changes by Paul Eggert
2395 Change zic.c to avoid creating symlinks to files that don't exist.
2398 Release 2002b - 2002-01-28 12:56:03 -0500
2400 [These change notes are for Release 2002a, which was corrupted.
2401 2002b was a corrected version of 2002a.]
2403 changes by Paul Eggert
2405 Update the "leapseconds" file to note that there'll be no leap
2406 second at the end of June, 2002.
2408 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone.
2410 Change to "difftime.c" to avoid sizeof problems.
2413 Release 2001d - 2001-10-09 13:31:32 -0400
2415 changes by Paul Eggert
2418 Release 2001c - 2001-06-05 13:59:55 -0400
2420 changes by Paul Eggert and Andrew Brown
2423 Release 2001b - 2001-04-05 16:44:38 -0400
2425 changes by Paul Eggert (modulo jnorgard's typo fix)
2427 tz-art.htm has been HTMLified.
2430 Release 2001a - 2001-03-13 12:57:44 -0500
2432 changes by Paul Eggert
2434 An addition to the "leapseconds" file: comments with the text of the
2435 latest IERS leap second notice.
2437 Trailing white space has been removed from data file lines, and
2438 repeated spaces in "Rule Jordan" lines in the "asia" file have been
2442 Release 2000h - 2000-12-14 15:33:38 -0500
2444 changes by Paul Eggert
2446 one typo fix in the "art" file
2448 With providence, this is the last update of the millennium.
2451 Release 2000g - 2000-10-10 11:35:22 -0400
2453 changes by Paul Eggert
2455 correction of John Mackin's name submitted by Robert Elz
2457 Garry Shandling's Daylight Saving Time joke (!?!) from the recent
2458 Emmy Awards broadcast.
2461 Release 2000f - 2000-08-10 09:31:58 -0400
2463 changes by Paul Eggert
2465 Added information in "tz-art.htm" on a Seinfeld reference to DST.
2467 Error checking and messages in the "yearistype" script have been
2471 Release 2000e - 2000-07-31 09:27:54 -0400
2473 data changes by Paul Eggert
2475 a change to the default value of the defined constant HAVE_STRERROR
2477 the addition of a Dave Barry quote on DST to the tz-arts file
2480 Release 2000d - 2000-04-20 15:43:04 -0400
2482 changes to the documentation and code of strftime for C99 conformance
2484 a bug fix for date.c
2486 These are based on (though modified from) changes by Paul Eggert.
2489 Release 2000c - 2000-03-04 10:31:43 -0500
2491 changes by Paul Eggert
2494 Release 2000b - 2000-02-21 12:16:29 -0500
2496 changes by Paul Eggert and Joseph Myers
2498 modest tweaks to the tz-art.htm and tz-link.htm files
2501 Release 2000a - 2000-01-18 09:21:26 -0500
2503 changes by Paul Eggert
2505 The two hypertext documents have also been renamed.
2508 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500
2510 Paul Eggert's changes
2512 additions to the "zic" manual page and the "Arts.htm" file
2515 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500
2520 Release data1999h - 1999-10-07 03:50:29 -0400
2522 changes by Paul Eggert to "europe" (most importantly, fixing
2523 Lithuania and Estonia)
2526 Release 1999g - 1999-09-28 11:06:18 -0400
2528 data changes by Paul Eggert (most importantly, the change for
2529 Lebanon that buys correctness for this coming Sunday)
2531 The "code" file contains changes to "Makefile" and "checktab.awk" to
2532 allow better checking of time zone files before they are published.
2535 Release 1999f - 1999-09-23 09:48:14 -0400
2537 changes by Arthur David Olson and Paul Eggert
2540 Release 1999e - 1999-08-17 15:20:54 -0400
2542 changes circulated by Paul Eggert, although the change to handling
2543 of DST-specifying time zone names has been commented out for now
2544 (search for "XXX" in "localtime.c" for details). These files also
2545 do not make any changes to the start of DST in Brazil.
2547 In addition to Paul's changes, there are updates to "Arts.htm" and
2551 Release 1999d - 1999-03-30 11:31:07 -0500
2553 changes by Paul Eggert
2555 The Makefile's "make public" rule has also been changed to do a test
2556 compile of each individual time zone data file (which should help
2557 avoid problems such as the one we had with Nicosia).
2560 Release 1999c - 1999-03-25 09:47:47 -0500
2562 changes by Paul Eggert, most importantly the change for Chile.
2565 Release 1999b - 1999-02-01 17:51:44 -0500
2567 changes by Paul Eggert
2569 code changes (suggested by Mani Varadarajan, mani at be.com) for
2570 correct handling of symbolic links when building using a relative directory
2572 code changes to generate correct messages for failed links
2574 updates to the URLs in Arts.htm
2577 Release 1999a - 1999-01-19 16:20:29 -0500
2579 error message internationalizations and corrections in zic.c and
2580 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz,
2584 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400
2586 changes for Brazil, Chile, and Germany
2588 support for use of "24:00" in the input files for the time zone compiler
2591 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400
2593 changes by Paul Eggert
2595 correction to a define in the "private.h" file
2598 Release data1998g - 1998-08-11 03:28:35 -0000
2599 [tzdata1998g.tar.gz is missing!]
2601 Lithuanian change provided by mgedmin at pub.osf.it
2603 Move creation of the GMT link with Etc/GMT to "etcetera" (from
2604 "backward") to ensure that the GMT file is created even where folks
2605 don't want the "backward" links (as suggested by Paul Eggert).
2608 Release data1998f - 1998-07-20 13:50:00 -0000
2609 [tzdata1998f.tar.gz is missing!]
2611 Update the "leapseconds" file to include the newly-announced
2612 insertion at the end of 1998.
2615 Release code1998f - 1998-06-01 10:18:31 -0400
2617 addition to localtime.c by Guy Harris
2620 Release 1998e - 1998-05-28 09:56:26 -0400
2622 The Makefile is changed to produce zoneinfo-posix rather than
2623 zoneinfo/posix, and to produce zoneinfo-leaps rather than
2626 data changes by Paul Eggert
2628 changes from Guy Harris to provide asctime_r and ctime_r
2630 A usno1998 file (substantially identical to usno1997) has been added.
2633 Release 1998d - 1998-05-14 11:58:34 -0400
2635 changes to comments (in particular, elimination of references to CIA maps).
2636 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places
2637 where changes occur.
2640 Release 1998c - 1998-02-28 12:32:26 -0500
2642 changes by Paul Eggert (save the "French correction," on which I'll
2643 wait for the dust to settle)
2647 changes and additions to Arts.htm
2650 Release 1998b - 1998-01-17 14:31:51 -0500
2652 URL cleanups and additions
2655 Release 1998a - 1998-01-13 12:37:35 -0500
2657 changes by Paul Eggert
2660 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500
2662 changes by Paul Eggert, with minor modifications from Arthur David
2663 Olson to make the files more browser friendly
2666 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500
2668 minor changes to put "TZif" at the start of each time zone information file
2670 a rule has also been added to the Makefile so you can
2672 to just recompile the zone information files (rather than doing a
2673 full "make install" with its other effects).
2676 Release data1997i - 1997-10-07 08:45:38 -0400
2678 changes to Africa by Paul Eggert
2681 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400
2683 corrections for Uruguay (and other locations)
2685 Arthur David Olson's simple-minded fix allowing mktime to both
2686 correctly handle leap seconds and correctly handle tm_sec values
2687 upon which arithmetic has been performed.
2690 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400
2692 Paul Eggert's updates
2694 a small change to a function prototype;
2696 "Music" has been renamed "Arts.htm", HTMLified, and augmented to
2697 include information on Around the World in Eighty Days.
2700 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400
2702 fixes to zic's error handling
2704 changes inspired by the item circulated on Slovenia
2706 The description of Web resources has been HTMLified for browsing
2709 A new piece of tz-related music has been added to the "Music" file.
2712 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500
2714 Paul Eggert's latest suggestions
2717 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500
2719 changes to "zic.c" to correct performance of the "-s" option
2721 a new file "usno1997"
2724 Release data1997c - 1997-03-04 09:58:18 -0500
2729 Release 1997b - 1997-02-27 18:34:19 -0500
2731 The data file incorporates the 1997 leap second.
2733 The code file incorporates Arthur David Olson's take on the
2734 zic/multiprocessor/directory-creation situation.
2737 Release 1997a - 1997-01-21 09:11:10 -0500
2739 Paul Eggert's Antarctica (and other changes)
2741 Arthur David Olson finessed the "getopt" issue by checking against
2742 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1
2743 is returned while SunOS 5.5's manual says EOF is returned).
2746 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500
2748 Paul Eggert's latest changes
2751 Release code1996n - 1996-12-16 09:42:02 -0500
2753 link snapping fix from Bruce Evans (via Garrett Wollman)
2756 Release data1996m - 1996-11-24 02:37:34 -0000
2757 [tzdata1996m.tar.gz is missing!]
2759 Paul Eggert's batch of changes
2762 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500
2764 No functional changes here; the files have simply been changed to
2765 make more use of ISO style dates in comments. The names of the above
2766 files now include the year in full.
2769 Release code96l - 1996-09-08 17:12:20 -0400
2771 tzcode96k was missing a couple of pieces.
2774 Release 96k - 1996-09-08 16:06:22 -0400
2776 the latest round of changes from Paul Eggert
2778 the recent Year 2000 material
2781 Release code96j - 1996-07-30 13:18:53 -0400
2783 Set sp->typecnt as suggested by Timothy Patrick Murphy.
2786 Release code96i - 1996-07-27 20:11:35 -0400
2788 Paul's suggested patch for strftime %V week numbers
2791 Release data96i - 1996-07-01 18:13:04 -0400
2793 "northamerica" and "europe" changes by Paul Eggert
2796 Release code96h - 1996-06-05 08:02:21 -0400
2798 fix for handling transitions specified in Universal Time
2800 Some "public domain" notices have also been added.
2803 Release code96g - 1996-05-16 14:00:26 -0400
2805 fix for the simultaneous-DST-and-zone-change challenge
2808 Release data96h - 1996-05-09 17:40:51 -0400
2810 changes by Paul Eggert
2813 Release code96f-data96g - 1996-05-03 03:09:59 -0000
2814 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!]
2816 The changes get us some of the way to fixing the problems noted in Paul
2817 Eggert's letter yesterday (in addition to a few others). The approach
2818 has been to make zic a bit smarter about figuring out what time zone
2819 abbreviations apply just after the time specified in the "UNTIL" part
2820 of a zone line. Putting the smarts in zic means avoiding having
2821 transition times show up in both "Zone" lines and "Rule" lines, which
2822 in turn avoids multiple transition time entries in time zone files.
2823 (This also makes the zic input files such as "europe" a bit shorter and
2824 should ease maintenance.)
2827 Release data96f - 1996-04-19 19:20:03 -0000
2828 [tzdata96f.tar.gz is missing!]
2830 The only changes are to the "northamerica" file; the time zone
2831 abbreviation for Denver is corrected to MST (and MDT), and the
2832 comments for Mexico have been updated.
2835 Release data96e - 1996-03-19 17:37:26 -0500
2837 Proposals by Paul Eggert, in particular the Portugal change that
2838 comes into play at the end of this month.
2841 Release data96d - 1996-03-18 20:49:39 -0500
2846 Release code96e - 1996-02-29 15:43:27 -0000
2847 [tzcode96e.tar.gz is missing!]
2849 internationalization changes and the fix to the documentation for strftime
2852 Release code96d-data96c - 1996-02-12 11:05:27 -0500
2854 The "code" file simply updates Bob Kridle's electronic address.
2856 The "data" file updates rules for Mexico.
2859 Release data96b - 1996-01-27 15:44:42 -0500
2864 Release code96c - 1996-01-16 16:58:15 -0500
2866 leap-year streamlining and binary-search changes
2871 Release code96b - 1996-01-10 20:42:39 -0500
2873 fixes and enhancements from Paul Eggert, including code that
2874 emulates the behavior of recent versions of the SunOS "date"
2878 Release 96a - 1996-01-06 09:08:24 -0500
2882 fixes to strftime.c for correct ISO 8601 week number generation,
2883 plus support for two new formats ('G' and 'g') to give ISO 8601 year
2884 numbers (which are not necessarily the same as calendar year numbers)
2887 Release code95i-data95m - 1995-12-21 12:46:47 -0500
2889 The latest revisions from Paul Eggert are included, the usno1995
2890 file has been updated, and a new file ("WWW") covering useful URLs
2894 Release code95h-data95l - 1995-12-19 18:10:12 -0500
2896 A simplification of a macro definition, a change to data for Sudan,
2897 and (for last minute shoppers) notes in the "Music" file on the CD
2901 Release code95g-data95k - 1995-10-30 10:32:47 -0500
2903 (slightly reformatted) 8-bit-clean proposed patch
2905 minor patch: US/Eastern -> America/New_York
2907 snapshot of the USNO's latest data ("usno1995")
2909 some other minor cleanups
2912 Release code95f-data95j - 1995-10-28 21:01:34 -0000
2913 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!]
2917 support for 64-bit time_t's
2919 optimization in localtime.c
2922 Release code95e - 1995-10-13 13:23:57 -0400
2924 the mktime change to scan from future to past when trying to find time zone
2928 Release data95i - 1995-09-26 10:43:26 -0400
2930 For Canada/Central, guess that the Sun customer's "one week too
2931 early" was just a approximation, and the true error is one month
2932 too early. This is consistent with the rest of Canada.
2935 Release data95h - 1995-09-21 11:26:48 -0400
2937 latest changes from Paul Eggert
2940 Release code95d - 1995-09-14 11:14:45 -0400
2942 the addition of a "Music" file, which documents four recorded
2943 versions of the tune "Save That Time".
2946 Release data95g - 1995-09-01 17:21:36 -0400
2948 "yearistype" correction
2951 Release data95f - 1995-08-28 20:46:56 -0400
2953 Paul Eggert's change to the australasia file
2956 Release data95e - 1995-07-08 18:02:34 -0400
2958 The only change is a leap second at the end of this year.
2959 Thanks to Bradley White for forwarding news on the leap second.
2962 Release data95d - 1995-07-03 13:26:22 -0400
2964 Paul Eggert's changes
2967 Release data95c - 1995-07-02 19:19:28 -0400
2969 changes to "asia", "backward", "europe", and "southamerica"
2970 (read: northamericacentrics need not apply)
2973 Release code95c - 1995-03-13 14:00:46 -0500
2975 one-line fix for sign extension problems in detzcode
2978 Release 95b - 1995-03-04 11:22:38 -0500
2980 Minor changes in both:
2982 The "code" file contains a workaround for the lack of "unistd.h" in
2983 Microsoft C++ version 7.
2985 The "data" file contains a fixed "Link" for America/Shiprock.
2988 Release 94h - 1994-12-10 12:51:14 -0500
2992 * incorporate the changes to "zdump" and "date" to make changes to
2993 the "TZ" environment variable permanent;
2995 * incorporate the table changes by Paul Eggert;
2997 * include (and document) support for universal time specifications in
2998 data files - but do not (yet) include use of this feature in the
3001 Think of this as "TZ Classic" - the software has been set up not to break if
3002 universal time shows up in its input, and data entries have been
3003 left as is so as not to break existing implementations.
3006 Release data94f - 1994-08-20 12:56:09 -0400
3008 (with thanks!) the latest data updates from Paul Eggert
3011 Release data94e - 1994-06-04 13:13:53 -0400
3016 Release code94g - 1994-05-05 12:14:07 -0400
3018 fix missing "optind.c" and a reference to it in the Makefile
3021 Release code94f - 1994-05-05 13:00:33 -0000
3022 [tzcode94f.tar.gz is missing!]
3024 changes to avoid overflow in difftime, as well as changes to cope
3025 with the 52/53 challenge in strftime
3028 Release code94e - 1994-03-30 23:32:59 -0500
3030 change for the benefit of PCTS
3033 Release 94d - 1994-02-24 15:42:25 -0500
3035 Avoid clashes with POSIX semantics for zones such as GMT+4.
3037 Some other very minor housekeeping is also present.
3040 Release code94c - 1994-02-10 08:52:40 -0500
3042 Fix bug where mkdirs was broken unless you compile with
3043 -fwritable-strings (which is generally losing to do).
3046 Release 94b - 1994-02-07 10:04:33 -0500
3048 work by Paul Eggert who notes:
3050 I found another book of time zone histories by E W Whitman; it's not
3051 as extensive as Shanks but has a few goodies of its own. I used it
3052 to update the tables. I also fixed some more as a result of
3053 correspondence with Adam David and Peter Ilieve, and move some stray
3054 links from 'europe' to 'backward'. I corrected some scanning errors
3057 As far as the code goes, I fixed zic to allow years in the range
3058 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900.
3059 And I cleaned up the zic documentation a little bit.
3062 Release data94a - 1994-02-03 08:58:54 -0500
3064 It simply incorporates the recently announced leap second into the
3068 Release 93g - 1993-11-22 17:28:27 -0500
3070 Paul Eggert has provided a good deal of historic information (based
3071 on Shanks), and there are some code changes to deal with the buglets
3072 that crawled out in dealing with the new information.
3075 Release 93f - 1993-10-15 12:27:46 -0400
3077 Paul Eggert's changes
3080 Release 93e - 1993-09-05 21:21:44 -0400
3082 This has updated data for Israel, England, and Kwajalein. There's
3083 also an update to "zdump" to cope with Kwajalein's 24-hour jump.
3084 Thanks to Paul Eggert and Peter Ilieve for the changes.
3087 Release 93d - 1993-06-17 23:34:17 -0400
3089 new fix and new data on Israel
3092 Release 93c - 1993-06-06 19:31:55 -0400
3097 Release 93b - 1993-02-02 14:53:58 -0500
3099 updated "leapseconds" file
3102 Release 93 - 1993-01-08 07:01:06 -0500
3104 At kre's suggestion, the package has been split in two - a code piece
3105 (which also includes documentation) that's only of use to folks who
3106 want to recompile things and a data piece useful to anyone who can
3109 The new version has a few changes to the data files, a few
3110 portability changes, and an off-by-one fix (with thanks to
3111 Tom Karzes at deshaw.com for providing a description and a
3115 Release 92c - 1992-11-21 17:35:36 -0000
3116 [tz92c.tar.Z is missing!]
3118 The fallout from the latest round of DST transitions.
3120 There are changes for Portugal, Saskatchewan, and "Pacific-New";
3121 there's also a change to "zic.c" that makes it portable to more systems.
3124 Release 92 - 1992-04-25 18:17:03 -0000
3125 [tz92.tar.Z is missing!]
3127 By popular demand (well, at any rate, following a request by kre at munnari)
3130 The 1989 update of the time zone package featured:
3132 * POSIXization (including interpretation of POSIX-style TZ environment
3133 variables, provided by Guy Harris),
3134 * ANSIfication (including versions of "mktime" and "difftime"),
3135 * SVIDulation (an "altzone" variable)
3136 * MACHination (the "gtime" function)
3137 * corrections to some time zone data (including corrections to the rules
3138 for Great Britain and New Zealand)
3139 * reference data from the United States Naval Observatory for folks who
3140 want to do additional time zones
3141 * and the 1989 data for Saudi Arabia.
3143 (Since this code will be treated as "part of the implementation" in some
3144 places and as "part of the application" in others, there's no good way to
3145 name functions, such as timegm, that are not part of the proposed ANSI C
3146 standard; such functions have kept their old, underscore-free names in this
3149 And the "dysize" function has disappeared; it was present to allow
3150 compilation of the "date" command on old BSD systems, and a version of "date"
3151 is now provided in the package. The "date" command is not created when you
3152 "make all" since it may lack options provided by the version distributed with
3153 your operating system, or may not interact with the system in the same way
3154 the native version does.
3156 Since POSIX frowns on correct leap second handling, the default behavior of
3157 the "zic" command (in the absence of a "-L" option) has been changed to omit
3158 leap second information from its output files.
3164 This file contains copies of the part of each release announcement
3165 that talks about the changes in that release. The text has been
3166 adapted and reformatted for the purposes of this file.
3168 Typically a release R consists of a pair of tarball files,
3169 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g.,
3170 code2010a, data2012c) consist of just one or the other tarball, and a
3171 few (e.g., code2012c-data2012d) have tarballs with mixed version
3174 Release time stamps are taken from the release's commit (for newer,
3175 git releases), from the newest file in the tarball (for older
3176 releases, where this info is available) or from the email announcing
3177 the release (if all else fails; these are marked with a time zone of
3178 -0000 and an "is missing!" comment).
3180 Earlier versions of the code and data were not announced on the tz
3181 list and are not summarized here.
3183 This file is in the public domain.