1 News for the tz database
3 Release 2018b - 2018-01-17 23:24:48 -0800
6 Fix a packaging problem in tz2018a, which was missing 'pacificnew'.
8 Changes to build procedure
10 The distribution now contains the file 'pacificnew' again.
11 This file was inadvertantly omitted in the 2018a distribution.
12 (Problem reported by Matias Fonzo.)
15 Release 2018a - 2018-01-12 22:29:21 -0800
18 São Tomé and Príncipe switched from +00 to +01.
19 Brazil's DST will now start on November's first Sunday.
20 Ireland's standard time is now in the summer, not the winter.
21 Use Debian-style installation locations, instead of 4.3BSD-style.
24 Changes to past and future time stamps
26 São Tomé and Príncipe switched from +00 to +01 on 2018-01-01 at
27 01:00. (Thanks to Steffen Thorsen and Michael Deckers.)
29 Changes to future time stamps
31 Starting in 2018 southern Brazil will begin DST on November's
32 first Sunday instead of October's third Sunday. (Thanks to
35 Changes to past time stamps
37 A discrepancy of 4 s in timestamps before 1931 in South Sudan has
38 been corrected. The 'backzone' and 'zone.tab' files did not agree
39 with the 'africa' and 'zone1970.tab' files. (Problem reported by
42 The abbreviation invented for Bolivia Summer Time (1931-2) is now
43 BST instead of BOST, to be more consistent with the convention
44 used for Latvian Summer Time (1918-9) and for British Summer Time.
48 Change Europe/Dublin so that it observes Irish Standard Time (UT
49 +01) in summer and GMT (as negative daylight-saving) in winter,
50 instead of observing standard time (GMT) in winter and Irish
51 Summer Time (UT +01) in summer. This change does not affect UT
52 offsets or abbreviations; it affects only whether timestamps are
53 considered to be standard time or daylight-saving time, as
54 expressed in the tm_isdst flag of C's struct tm type.
55 (Discrepancy noted by Derick Rethans.)
57 Changes to build procedure
59 The default installation locations have been changed to mostly
60 match Debian circa 2017, instead of being designed as an add-on to
61 4.3BSD circa 1986. This affects the Makefile macros TOPDIR,
62 TZDIR, MANDIR, and LIBDIR. New Makefile macros TZDEFAULT, USRDIR,
63 USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor
64 locations more precisely. (This responds to suggestions from
65 Brian Inglis and from Steve Summit.)
67 The default installation procedure no longer creates the
68 backward-compatibility link US/Pacific-New, which causes
69 confusion during user setup (e.g., see Debian bug 815200).
70 Use 'make BACKWARD="backward pacificnew"' to create the link
71 anyway, for now. Eventually we plan to remove the link entirely.
73 tzdata.zi now contains a version-number comment.
74 (Suggested by Tom Lane.)
76 The Makefile now quotes values like BACKWARD more carefully when
77 passing them to the shell. (Problem reported by Zefram.)
79 Builders no longer need to specify -DHAVE_SNPRINTF on platforms
80 that have snprintf and use pre-C99 compilers. (Problem reported
85 zic has a new option -t FILE that specifies the location of the
86 file that determines local time when TZ is unset. The default for
87 this location can be configured via the new TZDEFAULT makefile
88 macro, which defaults to /etc/localtime.
90 Diagnostics and commentary now distinguish UT from UTC more
91 carefully; see theory.html for more information about UT vs UTC.
93 zic has been ported to GCC 8's -Wstringop-truncation option.
94 (Problem reported by Martin Sebor.)
96 Changes to documentation and commentary
98 The zic man page now documents the longstanding behavior that
99 times and years can be out of the usual range, with negative times
100 counting backwards from midnight and with year 0 preceding year 1.
101 (Problem reported by Michael Deckers.)
103 The theory.html file now mentions the POSIX limit of six chars
104 per abbreviation, and lists alphabetic abbreviations used.
106 The files tz-art.htm and tz-link.htm have been renamed to
107 tz-art.html and tz-link.html, respectively, for consistency with
108 other file names and to simplify web server configuration.
111 Release 2017c - 2017-10-20 14:49:34 -0700
114 Northern Cyprus switches from +03 to +02/+03 on 2017-10-29.
115 Fiji ends DST 2018-01-14, not 2018-01-21.
116 Namibia switches from +01/+02 to +02 on 2018-04-01.
117 Sudan switches from +03 to +02 on 2017-11-01.
118 Tonga likely switches from +13/+14 to +13 on 2017-11-05.
119 Turks & Caicos switches from -04 to -05/-04 on 2018-11-04.
120 A new file tzdata.zi now holds a small text copy of all data.
121 The zic input format has been regularized slightly.
123 Changes to future time stamps
125 Northern Cyprus has decided to resume EU rules starting
126 2017-10-29, thus reinstituting winter time.
128 Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously
129 predicted. (Thanks to Dominic Fok.) Adjust future predictions
132 Namibia will switch from +01 with DST to +02 all year on
133 2017-09-03 at 02:00. This affects UT offsets starting 2018-04-01
134 at 02:00. (Thanks to Steffen Thorsen.)
136 Sudan will switch from +03 to +02 on 2017-11-01. (Thanks to Ahmed
137 Atyya and Yahia Abdalla.) South Sudan is not switching, so
138 Africa/Juba is no longer a link to Africa/Khartoum.
140 Tonga has likely ended its experiment with DST, and will not
141 adjust its clocks on 2017-11-05. Although Tonga has not announced
142 whether it will continue to observe DST, the IATA is assuming that
143 it will not. (Thanks to David Wade.)
145 Turks & Caicos will switch from -04 all year to -05 with US DST on
146 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04
147 at 02:00. (Thanks to Steffen Thorsen.)
149 Changes to past time stamps
151 Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03.
152 (Thanks to Arthur David Olson.)
154 Detroit did not observe DST in 1967.
156 Use railway time for Asia/Kolkata before 1941, by switching to
157 Madras local time (UT +052110) in 1870, then to IST (UT +0530) in
158 1906. Also, treat 1941-2's +0630 as DST, like 1942-5.
160 Europe/Dublin's 1946 and 1947 fallback transitions occurred at
161 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.)
163 Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to
164 American time in 1892, not 1879. (Thanks to Michael Deckers.)
166 Adjust the 1867 transition in Alaska to better reflect the
167 historical record, by changing it to occur on 1867-10-18 at 15:30
168 Sitka time rather than at the start of 1867-10-17 local time.
169 Although strictly speaking this is accurate only for Sitka,
170 the rest of Alaska's blanks need to be filled in somehow.
172 Fix off-by-one errors in UT offsets for Adak and Nome before 1867.
173 (Thanks to Michael Deckers.)
175 Add 7 s to the UT offset in Asia/Yangon before 1920.
177 Changes to zone names
179 Remove Canada/East-Saskatchewan from the 'backward' file, as it
180 exceeded the 14-character limit and was an unused misnomer anyway.
182 Changes to build procedure
184 To support applications that prefer to read time zone data in text
185 form, two zic input files tzdata.zi and leapseconds are now
186 installed by default. The commands 'zic tzdata.zi' and 'zic -L
187 leapseconds tzdata.zi' can reproduce the tzdata binary files
188 without and with leap seconds, respectively. To prevent these two
189 new files from being installed, use 'make TZDATA_TEXT=', and to
190 suppress leap seconds from the tzdata text installation, use 'make
191 TZDATA_TEXT=tzdata.zi'.
193 'make BACKWARD=' now suppresses backward-compatibility names
194 like 'US/Pacific' that are defined in the 'backward' and
197 'make check' now works on systems that lack a UTF-8 locale,
198 or that lack the nsgmls program. Set UTF8_LOCALE to configure
199 the name of a UTF-8 locale, if you have one.
201 Y2K runtime checks are no longer enabled by default. Add
202 -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of
203 adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU
204 to disable them. (New name suggested by Brian Inglis.)
206 The build procedure for zdump now works on AIX 7.1.
207 (Problem reported by Kees Dekker.)
211 zic and the reference runtime now reject multiple leap seconds
212 within 28 days of each other, or leap seconds before the Epoch.
213 As a result, support for double leap seconds, which was
214 obsolescent and undocumented, has been removed. Double leap
215 seconds were an error in the C89 standard; they have never existed
216 in civil timekeeping. (Thanks to Robert Elz and Bradley White for
217 noticing glitches in the code that uncovered this problem.)
219 zic now warns about use of the obsolescent and undocumented -y
220 option, and about use of the obsolescent TYPE field of Rule lines.
222 zic now allows unambiguous abbreviations like "Sa" and "Su" for
223 weekdays; formerly it rejected them due to a bug. Conversely, zic
224 no longer considers non-prefixes to be abbreviations; for example,
225 it no longer accepts "lF" as an abbreviation for "lastFriday".
226 Also, zic warns about the undocumented usage with a "last-"
227 prefix, e.g., "last-Fri".
229 Similarly, zic now accepts the unambiguous abbreviation "L" for
230 "Link" in ordinary context and for "Leap" in leap-second context.
231 Conversely, zic no longer accepts non-prefixes such as "La" as
232 abbreviations for words like "Leap".
234 zic no longer accepts leap second lines in ordinary input, or
235 ordinary lines in leap second input. Formerly, zic sometimes
236 warned about this undocumented usage and handled it incorrectly.
238 The new macro HAVE_TZNAME governs whether the tzname external
239 variable is exported, instead of USG_COMPAT. USG_COMPAT now
240 governs only the external variables "timezone" and "daylight".
241 This change is needed because the three variables are not in the
242 same category: although POSIX requires tzname, it specifies the
243 other two variables as optional. Also, USG_COMPAT is now 1 or 0:
244 if not defined, the code attempts to guess it from other macros.
246 localtime.c and difftime.c no longer require stdio.h, and .c files
247 other than zic.c no longer require sys/wait.h.
249 zdump.c no longer assumes snprintf. (Reported by Jonathan Leffler.)
251 Calculation of time_t extrema works around a bug in GCC 4.8.4
252 (Reported by Stan Shebs and Joseph Myers.)
254 zic.c no longer mistranslates formats of line numbers in non-English
255 locales. (Problem reported by Benno Schulenberg.)
257 Several minor changes have been made to the code to make it a
258 bit easier to port to MS-Windows and Solaris. (Thanks to Kees
259 Dekker for reporting the problems.)
261 Changes to documentation and commentary
263 The two new files 'theory.html' and 'calendars' contain the
264 contents of the removed file 'Theory'. The goal is to document
265 tzdb theory more accessibly.
267 The zic man page now documents abbreviation rules.
269 tz-link.htm now covers how to apply tzdata changes to clients.
270 (Thanks to Jorge Fábregas for the AIX link.) It also mentions MySQL.
272 The leap-seconds.list URL has been updated to something that is
273 more reliable for tzdb. (Thanks to Tim Parenti and Brian Inglis.)
275 Release 2017b - 2017-03-17 07:30:38 -0700
277 Briefly: Haiti has resumed DST.
279 Changes to past and future time stamps
281 Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.)
283 Changes to past time stamps
285 Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01.
287 Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430"
288 is one byte over the POSIX limit. (Problem reported by Derick Rethans.)
292 The reference localtime implementation now falls back on the
293 current US daylight-saving transition rules rather than the
294 1987-2006 rules. This fallback occurs only when (1) the TZ
295 environment variable's value has a name like "AST4ADT" that asks
296 for daylight saving time but does not specify the rules, (2) there
297 is no file by that name, and (3) the TZDEFRULES file cannot be
298 loaded. (Thanks to Tom Lane.)
301 Release 2017a - 2017-02-28 00:05:36 -0800
303 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia
306 Changes to future time stamps
308 Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.)
310 Chile's Region of Magallanes moves from -04/-03 to -03 year-round.
311 Its clocks diverge from America/Santiago starting 2017-05-13 at
312 23:00, hiving off a new zone America/Punta_Arenas. Although the
313 Chilean government says this change expires in May 2019, for now
314 assume it's permanent. (Thanks to Juan Correa and Deborah
315 Goldsmith.) This also affects Antarctica/Palmer.
317 Changes to past time stamps
319 Fix many entries for historical time stamps for Europe/Madrid
320 before 1979, to agree with tables compiled by Pere Planesas of the
321 National Astronomical Observatory of Spain. As a side effect,
322 this changes some time stamps for Africa/Ceuta before 1929, which
323 are probably guesswork anyway. (Thanks to Steve Allen and
324 Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for
325 correcting the 1901 transition.)
327 Ecuador observed DST from 1992-11-28 to 1993-02-05.
328 (Thanks to Alois Treindl.)
330 Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21.
331 (Thanks to Stepan Golosunov.)
333 Changes to past and future time zone abbreviations
335 Switch to numeric time zone abbreviations for South America, as
336 part of the ongoing project of removing invented abbreviations.
337 This avoids the need to invent an abbreviation for the new Chilean
338 new zone. Similarly, switch from invented to numeric time zone
339 abbreviations for Afghanistan, American Samoa, the Azores,
340 Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei,
341 Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is,
342 Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland,
343 Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia,
344 the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia,
345 Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau,
346 Papua New Guinea, the Philippines, Pitcairn, Qatar, Réunion, St
347 Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore,
348 Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and
349 Xinjiang; for 20-minute daylight saving time in Ghana before 1943;
350 for half-hour daylight saving time in Belize before 1944 and in
351 the Dominican Republic before 1975; and for Canary Islands before
352 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for
353 Indian Summer Time before 1942, for Indonesia before around 1964,
354 for Kenya before 1960, for Liberia before 1973, for Madeira before
355 1967, for Namibia before 1943, for the Netherlands in 1937-9, for
356 Pakistan before 1971, for Western Sahara before 1977, and for
357 Zaporozhye in 1880-1924.
359 For Alaska time from 1900 through 1967, instead of "CAT" use the
360 abbreviation "AST", the abbreviation commonly used at the time
361 (Atlantic Standard Time had not been standardized yet). Use "AWT"
362 and "APT" instead of the invented abbreviations "CAWT" and "CAPT".
364 Use "CST" and "CDT" instead of invented abbreviations for Macau
365 before 1999 and Taiwan before 1938, and use "JST" instead of the
366 invented abbreviation "JCST" for Japan and Korea before 1938.
368 Change to database entry category
370 Move the Pacific/Johnston link from 'australasia' to 'backward',
371 since Johnston is now uninhabited.
375 zic no longer mishandles some transitions in January 2038 when it
376 attempts to work around Qt bug 53071. This fixes a bug affecting
377 Pacific/Tongatapu that was introduced in zic 2016e. localtime.c
378 now contains a workaround, useful when loading a file generated by
379 a buggy zic. (Problem and localtime.c fix reported by Bradley
382 zdump -i now outputs non-hour numeric time zone abbreviations
383 without a colon, e.g., "+0530" rather than "+05:30". This agrees
384 with zic %z and with common practice, and simplifies auditing of
387 zdump is now buildable again with -DUSE_LTZ=0.
388 (Problem reported by Joseph Myers.)
390 zdump.c now always includes private.h, to avoid code duplication
391 with private.h. (Problem reported by Kees Dekker.)
393 localtime.c no longer mishandles early or late timestamps
394 when TZ is set to a POSIX-style string that specifies DST.
395 (Problem reported by Kees Dekker.)
397 date and strftime now cause %z to generate "-0000" instead of
398 "+0000" when the UT offset is zero and the time zone abbreviation
401 Changes to documentation and commentary
403 The 'Theory' file now better documents choice of historical time
404 zone abbreviations. (Problems reported by Michael Deckers.)
406 tz-link.htm now covers leap smearing, which is popular in clouds.
409 Release 2016j - 2016-11-22 23:17:13 -0800
411 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04.
413 Changes to future time stamps
415 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00.
416 This hives off a new zone Europe/Saratov from Europe/Volgograd.
417 (Thanks to Yuri Konotopov and Stepan Golosunov.)
419 Changes to past time stamps
421 The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like
422 Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring
423 1999, not fall 1994. (Thanks to Stepan Golosunov.)
425 Changes to past time zone abbreviations
427 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote
428 summer time before 1948. The old use of "EET" was a typo.
432 zic no longer mishandles file systems that lack hard links, fixing
433 bugs introduced in 2016g. (Problems reported by Tom Lane.)
434 Also, when the destination already contains symbolic links, zic
435 should now work better on systems where the 'link' system call
436 does not follow symbolic links.
438 Changes to documentation and commentary
440 tz-link.htm now documents the relationship between release version
441 numbers and development-repository commit tags. (Suggested by
444 The 'Theory' file now documents UT.
446 iso3166.tab now accents "Curaçao", and commentary now mentions
447 the names "Cabo Verde" and "Czechia". (Thanks to Jiří Boháč.)
450 Release 2016i - 2016-11-01 23:19:52 -0700
452 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga
453 reintroduces DST on 2016-11-06.
455 Changes to future time stamps
457 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on
458 2017-01-15 at 03:00. Assume future observances in Tonga will be
459 from the first Sunday in November through the third Sunday in
460 January, like Fiji. (Thanks to Pulu ʻAnau.) Switch to numeric
461 time zone abbreviations for this zone.
463 Changes to past and future time stamps
465 Northern Cyprus is now +03 year round, causing a split in Cyprus
466 time zones starting 2016-10-30 at 04:00. This creates a zone
467 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.)
469 Antarctica/Casey switched from +08 to +11 on 2016-10-22.
470 (Thanks to Steffen Thorsen.)
472 Changes to past time stamps
474 Several corrections were made for pre-1975 time stamps in Italy.
475 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and
478 First, the 1893-11-01 00:00 transition in Italy used the new UT
479 offset (+01), not the old (+00:49:56). (Thanks to Michael
482 Second, rules for daylight saving in Italy were changed to agree
483 with Italy's National Institute of Metrological Research (INRiM)
484 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian
485 Inglis, and Michael Deckers):
487 The 1916-06-03 transition was at 24:00, not 00:00.
489 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at
492 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not
495 The 1944-09-17 transition was at 03:00, not 01:00. This
496 particular change is taken from Italian law as INRiM's table,
497 (which says 02:00) appears to have a typo here. Also, keep the
498 1944-04-03 transition for Europe/Rome, as Rome was controlled by
501 The 1967-1970 and 1972-1974 fallback transitions were at 01:00,
506 The code should now be buildable on AmigaOS merely by setting the
507 appropriate Makefile variables. (From a patch by Carsten Larsen.)
510 Release 2016h - 2016-10-19 23:17:57 -0700
512 Changes to future time stamps
514 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not
515 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that
516 future fall transitions will be on the last Saturday of October
517 at 01:00, which is consistent with predicted spring transitions
518 on the last Saturday of March. (Thanks to Tim Parenti.)
520 Changes to past time stamps
522 In Turkey, transitions in 1986-1990 were at 01:00 standard time
523 not at 02:00, and the spring 1994 transition was on March 20, not
524 March 27. (Thanks to Kıvanç Yazan.)
526 Changes to past and future time zone abbreviations
528 Asia/Colombo now uses numeric time zone abbreviations like "+0530"
529 instead of alphabetic ones like "IST" and "LKT". Various
530 English-language sources use "IST", "LKT" and "SLST", with no
531 working consensus. (Usage of "SLST" mentioned by Sadika
536 zic no longer mishandles relativizing file names when creating
537 symbolic links like /etc/localtime, when these symbolic links
538 are outside the usual directory hierarchy. This fixes a bug
539 introduced in 2016g. (Problem reported by Andreas Stieger.)
541 Changes to build procedure
543 New rules 'traditional_tarballs' and 'traditional_signatures' for
544 building just the traditional-format distribution. (Requested by
547 The file 'version' is now put into the tzdata tarball too.
548 (Requested by Howard Hinnant.)
550 Changes to documentation and commentary
552 The 'Theory' file now has a section on interface stability.
553 (Requested by Paul Koning.) It also mentions features like
554 tm_zone and localtime_rz that have long been supported by the
557 tz-link.htm has improved coverage of time zone boundaries suitable
558 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt
561 The US commentary now mentions Allen and the "day of two noons".
563 The Fiji commentary mentions the government's 2016-10-03 press
564 release. (Thanks to Raymond Kumar.)
567 Release 2016g - 2016-09-13 08:56:38 -0700
569 Changes to future time stamps
571 Turkey switched from EET/EEST (+02/+03) to permanent +03,
572 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather
573 than an invented abbreviation for the new time.
575 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52.
576 (Thanks to Tim Parenti.)
578 Changes to past time stamps
580 For America/Los_Angeles, spring-forward transition times have been
581 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in
584 For zones using Soviet time on 1919-07-01, transitions to UT-based
585 time were at 00:00 UT, not at 02:00 local time. The affected
586 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and
587 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.)
589 Changes to past and future time zone abbreviations
591 The Factory zone now uses the time zone abbreviation -00 instead
592 of a long English-language string, as -00 is now the normal way to
593 represent an undefined time zone.
595 Several zones in Antarctica and the former Soviet Union, along
596 with zones intended for ships at sea that cannot use POSIX TZ
597 strings, now use numeric time zone abbreviations instead of
598 invented or obsolete alphanumeric abbreviations. The affected
599 zones are Antarctica/Casey, Antarctica/Davis,
600 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera,
601 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok,
602 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita,
603 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga,
604 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin,
605 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi,
606 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg,
607 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11,
608 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5,
609 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2,
610 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8,
611 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad,
612 Europe/Minsk, Europe/Samara, Europe/Volgograd, and
613 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM
614 was replaced by +05, whereas MSK and MSD were kept as they are not
615 our invention and are widely used.
617 Changes to zone names
619 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link.
620 (Thanks to David Massoud.)
624 zic no longer generates binary files containing POSIX TZ-like
625 strings that disagree with the local time type after the last
626 explicit transition in the data. This fixes a bug with
627 Africa/Casablanca and Africa/El_Aaiun in some year-2037 time
628 stamps on the reference platform. (Thanks to Alexander Belopolsky
629 for reporting the bug and suggesting a way forward.)
631 If the installed localtime and/or posixrules files are symbolic
632 links, zic now keeps them symbolic links when updating them, for
633 compatibility with platforms like OpenSUSE where other programs
634 configure these files as symlinks.
636 zic now avoids hard linking to symbolic links, avoids some
637 unnecessary mkdir and stat system calls, and uses shorter file
640 zdump has a new -i option to generate transitions in a
641 more-compact but still human-readable format. This option is
642 experimental, and the output format may change in future versions.
643 (Thanks to Jon Skeet for suggesting that an option was needed,
644 and thanks to Tim Parenti and Chris Rovick for further comments.)
646 Changes to build procedure
648 An experimental distribution format is available, in addition
649 to the traditional format which will continue to be distributed.
650 The new format is a tarball tzdb-VERSION.tar.lz with signature
651 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory
652 tzdb-VERSION containing the code and data of the traditional
653 two-tarball format, along with extra data that may be useful.
654 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others
655 for comments about the experimental format.)
657 The release version number is now more accurate in the usual case
658 where releases are built from a Git repository. For example, if
659 23 commits and some working-file changes have been made since
660 release 2016g, the version number is now something like
661 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'.
662 Tagged releases use the same version number format as before,
663 e.g., '2016g'. To support the more-accurate version number, its
664 specification has moved from a line in the Makefile to a new
665 source file 'version'.
667 The experimental distribution contains a file to2050.tzs that
668 contains what should be the output of 'zdump -i -c 2050' on
669 primary zones. If this file is available, 'make check' now checks
670 that zdump generates this output.
672 'make check_web' now works on Fedora-like distributions.
674 Changes to documentation and commentary
676 tzfile.5 now documents the new restriction on POSIX TZ-like
677 strings that is now implemented by zic.
679 Comments now cite URLs for some 1917-1921 Russian DST decrees.
680 (Thanks to Alexander Belopolsky.)
682 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J
683 (thanks to Meno Hochschild) and ThreeTen-Extra, and its
684 description of Java 8 has been brought up to date (thanks to
685 Stephen Colebourne). Its description of local time on Mars has
686 been updated to match current practice, and URLs have been updated
687 and some obsolete ones removed.
690 Release 2016f - 2016-07-05 16:26:51 +0200
692 Changes affecting future time stamps
694 The Egyptian government changed its mind on short notice, and
695 Africa/Cairo will not introduce DST starting 2016-07-07 after all.
696 (Thanks to Mina Samuel.)
698 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00.
699 (Thanks to Stepan Golosunov.)
701 Changes to past and future time stamps
703 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone
704 abbreviations instead of invented ones.
706 Changes affecting past time stamps
708 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00.
709 (Thanks to Stepan Golosunov.)
712 Release 2016e - 2016-06-14 08:46:16 -0700
714 Changes affecting future time stamps
716 Africa/Cairo observes DST in 2016 from July 7 to the end of October.
717 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.)
718 For future years, guess April's last Thursday to October's last
719 Thursday except for Ramadan.
721 Changes affecting past time stamps
723 Locations while uninhabited now use '-00', not 'zzz', as a
724 placeholder time zone abbreviation. This is inspired by Internet
725 RFC 3339 and is more consistent with numeric time zone
726 abbreviations already used elsewhere. The change affects several
727 arctic and antarctic locations, e.g., America/Cambridge_Bay before
728 1920 and Antarctica/Troll before 2005.
730 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was
731 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.)
735 zic now outputs a dummy transition at time 2**31 - 1 in zones
736 whose POSIX-style TZ strings contain a '<'. This mostly works
737 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>.
738 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.)
740 Changes affecting documentation and commentary
742 tz-link.htm says why governments should give plenty of notice for
743 time zone or DST changes, and refers to Matt Johnson's blog post.
745 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.)
748 Release 2016d - 2016-04-17 22:50:29 -0700
750 Changes affecting future time stamps
752 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30.
753 (Thanks to Alexander Krivenyshev for the heads-up.)
755 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00.
756 (Thanks to Alexander Krivenyshev and Matt Johnson.)
758 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers
759 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29
760 at 02:00. (Thanks to Stepan Golosunov.)
762 Changes affecting past time stamps
764 New zone Europe/Kirov, split off from Europe/Volgograd. It covers
765 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on
766 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made
767 the same change. (Thanks to Stepan Golosunov.)
769 Russia and nearby locations had daylight-saving transitions on
770 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on
771 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan
774 Many corrections to historical time in Kazakhstan from 1991
775 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's
776 invented time zone abbreviations with numeric abbreviations.
778 Changes to commentary
780 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references).
783 Release 2016c - 2016-03-23 00:51:27 -0700
785 Changes affecting future time stamps
787 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.)
789 Chile reverts from permanent to seasonal DST. (Thanks to Juan
790 Correa for the heads-up, and to Tim Parenti for corrections.)
791 Guess that future transitions are August's and May's second
792 Saturdays at 24:00 mainland time. Also, call the period from
793 2014-09-07 through 2016-05-14 daylight saving time instead of
794 standard time, as that seems more appropriate now.
796 Changes affecting past time stamps
798 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to
799 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed
800 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26.
801 (Thanks to Stepan Golosunov.)
803 Changes to commentary
805 Several updates and URLs for historical and proposed Russian changes.
806 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.)
809 Release 2016b - 2016-03-12 17:30:14 -0800
813 Starting with release 2016b, some data entries cause zic implementations
814 derived from tz releases 2005j through 2015e to issue warnings like
815 "time zone abbreviation differs from POSIX standard (+03)".
816 These warnings should not otherwise affect zic's output and can safely be
817 ignored on today's platforms, as the warnings refer to a restriction in
818 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the
819 warnings is to upgrade to zic derived from tz releases 2015f and later.
821 Changes affecting future time stamps
823 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and
824 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on
825 2016-03-27 at 02:00 local time. They need distinct zones since their
826 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and
827 Altai Republic, Russia, which will switch from +06 to +07 on the same date
828 and local time. The Astrakhan change is already official; the others have
829 passed the first reading in the State Duma and are extremely likely.
830 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00.
831 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson
832 and Stepan Golosunov for followup.)
834 As a trial of a new system that needs less information to be made up,
835 the new zones use numeric time zone abbreviations like "+04"
836 instead of invented abbreviations like "ASTT".
838 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via
841 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00.
842 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last
843 Saturday at 01:00, not March's last Friday at 24:00.
845 Changes affecting past time stamps
847 Europe/Chisinau observed DST during 1990, and switched from +04 to
848 +03 at 1990-05-06 02:00, instead of switching from +03 to +02.
849 (Thanks to Stepan Golosunov.)
851 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not
852 KUYT/KUYST. (Thanks to Stepan Golosunov.)
856 tzselect's diagnostics and checking, and checktab.awk's checking,
857 have been improved. (Thanks to J William Piggott.)
859 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.)
861 tzselect now tests Julian-date TZ settings more accurately.
862 (Thanks to J William Piggott.)
864 Changes to commentary
866 Comments in zone tables have been improved. (Thanks to J William Piggott.)
868 tzselect again limits its menu comments so that menus fit on a
869 24x80 alphanumeric display.
871 A new web page tz-how-to.html. (Thanks to Bill Seymour.)
873 In the Theory file, the description of possible time zone abbreviations in
874 tzdata has been cleaned up, as the old description was unclear and
875 inconsistent. (Thanks to Alain Mouette for reporting the problem.)
878 Release 2016a - 2016-01-26 23:28:02 -0800
880 Changes affecting future time stamps
882 America/Cayman will not observe daylight saving this year after all.
883 Revert our guess that it would. (Thanks to Matt Johnson.)
885 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00.
886 (Thanks to Alexander Krivenyshev.)
888 Asia/Tehran now has DST predictions for the year 2038 and later,
889 to be March 21 00:00 to September 21 00:00. This is likely better
890 than predicting no DST, albeit off by a day every now and then.
892 Changes affecting past and future time stamps
894 America/Metlakatla switched from PST all year to AKST/AKDT on
895 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.)
897 America/Santa_Isabel has been removed, and replaced with a
898 backward compatibility link to America/Tijuana. Its contents were
899 apparently based on a misreading of Mexican legislation.
901 Changes affecting past time stamps
903 Asia/Karachi's two transition times in 2002 were off by a minute.
904 (Thanks to Matt Johnson.)
906 Changes affecting build procedure
908 An installer can now combine leap seconds with use of the backzone file,
909 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'.
910 The old 'make posix_packrat' rule is now marked as obsolescent.
911 (Thanks to Ian Abbott for an initial implementation.)
913 Changes affecting documentation and commentary
915 A new file LICENSE makes it easier to see that the code and data
916 are mostly public-domain. (Thanks to James Knight.) The three
917 non-public-domain files now use the current (3-clause) BSD license
918 instead of older versions of that license.
920 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki),
921 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section
922 on editing tz source files (with a mention of Sublime zoneinfo,
923 thanks to Gilmore Davidson).
925 The Theory and asia files now mention the 2015 book "The Global
926 Transformation of Time, 1870-1950", and cite a couple of reviews.
928 The America/Chicago entry now documents the informal use of US
929 central time in Fort Pierre, South Dakota. (Thanks to Rick
930 McDermid, Matt Johnson, and Steve Jones.)
933 Release 2015g - 2015-10-01 00:39:51 -0700
935 Changes affecting future time stamps
937 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25.
940 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time.
941 (Thanks to Alexander Krivenyshev.)
943 Fiji's 2016 fall-back transition is scheduled for January 17, not 24.
944 (Thanks to Ken Rylander.)
946 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has
947 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08.
948 New zone America/Fort_Nelson. (Thanks to Matt Johnson.)
950 Changes affecting past time stamps
952 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00.
954 Changes affecting code
956 localtime no longer mishandles America/Anchorage after 2037.
957 (Thanks to Bradley White for reporting the bug.)
959 On hosts with signed 32-bit time_t, localtime no longer mishandles
960 Pacific/Fiji after 2038-01-16 14:00 UTC.
962 The localtime module allows the variables 'timezone', 'daylight',
963 and 'altzone' to be in common storage shared with other modules,
964 and declares them in case the system <time.h> does not.
965 (Problems reported by Kees Dekker.)
967 On platforms with tm_zone, strftime.c now assumes it is not NULL.
968 This simplifies the code and is consistent with zdump.c.
969 (Problem reported by Christos Zoulas.)
971 Changes affecting documentation
973 The tzfile man page now documents that transition times denote the
974 starts (not the ends) of the corresponding time periods.
975 (Ambiguity reported by Bill Seymour.)
978 Release 2015f - 2015-08-10 18:06:56 -0700
980 Changes affecting future time stamps
982 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.)
983 The abbreviation remains "KST". (Thanks to Robert Elz.)
985 Uruguay no longer observes DST. (Thanks to Steffen Thorsen
988 Changes affecting past and future time stamps
990 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC.
991 (Thanks to Roman Tudos.)
993 Changes affecting data format and code
995 zic's '-y YEARISTYPE' option is no longer documented. The TYPE
996 field of a Rule line should now be '-'; the old values 'even',
997 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented.
998 Although the implementation has not changed, these features do not
999 work in the default installation, they are not used in the data,
1000 and they are now considered obsolescent.
1002 zic now checks that two rules don't take effect at the same time.
1003 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on
1004 simultaneity are now documented.
1006 The two characters '%z' in a zone format now stand for the UT
1007 offset, e.g., '-07' for seven hours behind UT and '+0530' for
1008 five hours and thirty minutes ahead. This better supports time
1009 zone abbreviations conforming to POSIX.1-2001 and later.
1011 Changes affecting installed data files
1013 Comments for America/Halifax and America/Glace_Bay have been improved.
1014 (Thanks to Brian Inglis.)
1016 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol,
1017 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller
1018 installed data files for Europe/Simferopol and Europe/Tallinn.
1019 It does not affect timestamps. (Thanks to Howard Hinnant.)
1021 Changes affecting code
1023 zdump and zic no longer warn about valid time zone abbreviations
1026 Some Visual Studio 2013 warnings have been suppressed.
1027 (Thanks to Kees Dekker.)
1029 'date' no longer sets the time of day and its -a, -d, -n and -t
1030 options have been removed. Long obsolescent, the implementation
1031 of these features had porting problems. Builders no longer need
1032 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H.
1033 (Thanks to Kees Dekker for pointing out the problem.)
1035 Changes affecting documentation
1037 The Theory file mentions naming issues earlier, as these seem to be
1038 poorly publicized (thanks to Gilmore Davidson for reporting the problem).
1040 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant).
1042 Mention that Herbert Samuel introduced the term "Summer Time".
1045 Release 2015e - 2015-06-13 10:56:02 -0700
1047 Changes affecting future time stamps
1049 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00,
1050 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.)
1052 Assume Cayman Islands will observe DST starting next year, using US rules.
1053 Although it isn't guaranteed, it is the most likely.
1055 Changes affecting data format
1057 The file 'iso3166.tab' now uses UTF-8, so that its entries can better
1058 spell the names of Åland Islands, Côte d'Ivoire, and Réunion.
1060 Changes affecting code
1062 When displaying data, tzselect converts it to the current locale's
1063 encoding if the iconv command works. (Problem reported by random832.)
1065 tzselect no longer mishandles Dominica, fixing a bug introduced
1066 in Release 2014f. (Problem reported by Owen Leibman.)
1068 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\".
1069 This fixes a bug introduced in Release 2014f.
1070 (Problem reported by Leonardo Chiquitto.)
1073 Release 2015d - 2015-04-24 08:09:46 -0700
1075 Changes affecting future time stamps
1077 Egypt will not observe DST in 2015 and will consider canceling it
1078 permanently. For now, assume no DST indefinitely.
1079 (Thanks to Ahmed Nazmy and Tim Parenti.)
1081 Changes affecting past time stamps
1083 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not
1084 1966-07-01. Also, Yukon's time zone history is documented better.
1085 (Thanks to Brian Inglis and Dennis Ferguson.)
1087 Change affecting past and future time zone abbreviations
1089 The abbreviations for Hawaii-Aleutian standard and daylight times
1090 have been changed from HAST/HADT to HST/HDT, as per US Government
1091 Printing Office style. This affects only America/Adak since 1983,
1092 as America/Honolulu was already using the new style.
1094 Changes affecting code
1096 zic has some minor performance improvements.
1099 Release 2015c - 2015-04-11 08:55:55 -0700
1101 Changes affecting future time stamps
1103 Egypt's spring-forward transition is at 24:00 on April's last Thursday,
1104 not 00:00 on April's last Friday. 2015's transition will therefore be on
1105 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes
1106 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.)
1108 Changes affecting past time stamps
1110 The following changes affect some pre-1991 Chile-related time stamps
1111 in America/Santiago, Antarctica/Palmer, and Pacific/Easter.
1113 The 1910 transition was January 10, not January 1.
1115 The 1918 transition was September 10, not September 1.
1117 The UT -04 time observed from 1932 to 1942 is now considered to
1118 be standard time, not year-round DST.
1120 Santiago observed DST (UT -03) from 1946-07-15 through
1121 1946-08-31, then reverted to standard time, then switched to -05
1124 Assume transitions before 1968 were at 00:00, since we have no data
1127 The spring 1988 transition was 1988-10-09, not 1988-10-02.
1128 The fall 1990 transition was 1990-03-11, not 1990-03-18.
1130 Assume no UT offset change for Pacific/Easter on 1890-01-01,
1131 and omit all transitions on Pacific/Easter from 1942 through 1946
1132 since we have no data suggesting that they existed.
1134 One more zone has been turned into a link, as it differed
1135 from an existing zone only for older time stamps. As usual,
1136 this change affects UT offsets in pre-1970 time stamps only.
1137 The zone's old contents have been moved to the 'backzone' file.
1138 The affected zone is America/Montreal.
1140 Changes affecting commentary
1142 Mention the TZUpdater tool.
1144 Mention "The Time Now". (Thanks to Brandon Ramsey.)
1147 Release 2015b - 2015-03-19 23:28:11 -0700
1149 Changes affecting future time stamps
1151 Mongolia will start observing DST again this year, from the last
1152 Saturday in March at 02:00 to the last Saturday in September at 00:00.
1153 (Thanks to Ganbold Tsagaankhuu.)
1155 Palestine will start DST on March 28, not March 27. Also,
1156 correct the fall 2014 transition from September 26 to October 24.
1157 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.)
1159 Changes affecting past time stamps
1161 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a
1162 regression. (Thanks to Stuart Bishop for reporting the problem.)
1164 Some more zones have been turned into links, when they differed
1165 from existing zones only for older time stamps. As usual,
1166 these changes affect UT offsets in pre-1970 time stamps only.
1167 Their old contents have been moved to the 'backzone' file.
1168 The affected zones are: America/Antigua, America/Cayman,
1169 Pacific/Midway, and Pacific/Saipan.
1171 Changes affecting time zone abbreviations
1173 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD".
1176 Changes affecting code
1178 Fix integer overflow bug in reference 'mktime' implementation.
1179 (Problem reported by Jörg Richter.)
1181 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries
1182 to be used in the same executable as standard-library time_t functions.
1183 (Problems reported by Bradley White.)
1185 Changes affecting commentary
1187 Cite the recent Mexican decree changing Quintana Roo's time zone.
1188 (Thanks to Carlos Raúl Perasso.)
1190 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.)
1192 Update info about Mars time.
1195 Release 2015a - 2015-01-29 22:35:20 -0800
1197 Changes affecting future time stamps
1199 The Mexican state of Quintana Roo, represented by America/Cancun,
1200 will shift from Central Time with DST to Eastern Time without DST
1201 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.)
1203 Chile will not change clocks in April or thereafter; its new standard time
1204 will be its old daylight saving time. This affects America/Santiago,
1205 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.)
1207 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
1208 (Thanks to Tim Parenti.)
1210 Changes affecting past time stamps
1212 Iceland observed DST in 1919 and 1921, and its 1939 fallback
1213 transition was Oct. 29, not Nov. 29. Remove incorrect data from
1214 Shanks about time in Iceland between 1837 and 1908.
1216 Some more zones have been turned into links, when they differed
1217 from existing zones only for older time stamps. As usual,
1218 these changes affect UT offsets in pre-1970 time stamps only.
1219 Their old contents have been moved to the 'backzone' file.
1220 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
1223 Changes affecting code
1225 tzalloc now scrubs time zone abbreviations compatibly with the way
1226 that tzset always has, by replacing invalid bytes with '_' and by
1227 shortening too-long abbreviations.
1229 tzselect ports to POSIX awk implementations, no longer mishandles
1230 POSIX TZ settings when GNU awk is used, and reports POSIX TZ
1231 settings to the user. (Thanks to Stefan Kuhn.)
1233 Changes affecting build procedure
1235 'make check' now checks for links to links in the data.
1236 One such link (for Africa/Asmera) has been fixed.
1237 (Thanks to Stephen Colebourne for pointing out the problem.)
1239 Changes affecting commentary
1241 The leapseconds file commentary now mentions the expiration date.
1242 (Problem reported by Martin Burnicki.)
1244 Update Mexican Library of Congress URL.
1247 Release 2014j - 2014-11-10 17:37:11 -0800
1249 Changes affecting current and future time stamps
1251 Turks & Caicos' switch from US eastern time to UT -04 year-round
1252 did not occur on 2014-11-02 at 02:00. It's currently scheduled
1253 for 2015-11-01 at 02:00. (Thanks to Chris Walton.)
1255 Changes affecting past time stamps
1257 Many pre-1989 time stamps have been corrected for Asia/Seoul and
1258 Asia/Pyongyang, based on sources for the Korean-language Wikipedia
1259 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no
1260 longer guess that Pyongyang mimicked Seoul time after World War II,
1261 as this is politically implausible.
1263 Some more zones have been turned into links, when they differed
1264 from existing zones only for older time stamps. As usual,
1265 these changes affect UT offsets in pre-1970 time stamps only.
1266 Their old contents have been moved to the 'backzone' file.
1267 The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
1268 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
1269 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and
1272 Changes affecting commentary
1274 The commentary is less enthusiastic about Shanks as a source,
1275 and is more careful to distinguish UT from UTC.
1278 Release 2014i - 2014-10-21 22:04:57 -0700
1280 Changes affecting future time stamps
1282 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
1283 (Thanks to Ken Rylander for the heads-up.) Guess that future
1284 years will use a similar pattern.
1286 A new Zone Pacific/Bougainville, for the part of Papua New Guinea
1287 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00.
1288 (Thanks to Kiley Walbom for the heads-up.)
1290 Changes affecting time zone abbreviations
1292 Since Belarus is not changing its clocks even though Moscow is,
1293 the time zone abbreviation in Europe/Minsk is changing from FET
1294 to its more-traditional value MSK on 2014-10-26 at 01:00.
1295 (Thanks to Alexander Bokovoy for the heads-up about Belarus.)
1297 The new abbreviation IDT stands for the pre-1976 use of UT +08 in
1298 Indochina, to distinguish it better from ICT (+07).
1300 Changes affecting past time stamps
1302 Many time stamps have been corrected for Asia/Ho_Chi_Minh before 1976
1303 (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
1304 authoritative book). Asia/Ho_Chi_Minh has been added to
1305 zone1970.tab, to give tzselect users in Vietnam two choices,
1306 since north and south Vietnam disagreed after our 1970 cutoff.
1308 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
1309 they differed from existing zones only for older time stamps. As
1310 usual, these changes affect pre-1970 time stamps only. Their old
1311 contents have been moved to the 'backzone' file.
1313 Changes affecting code
1315 The time-related library functions now set errno on failure, and
1316 some crashes in the new tzalloc-related library functions have
1317 been fixed. (Thanks to Christos Zoulas for reporting most of
1318 these problems and for suggesting fixes.)
1320 If USG_COMPAT is defined and the requested timestamp is standard time,
1321 the tz library's localtime and mktime functions now set the extern
1322 variable timezone to a value appropriate for that timestamp; and
1323 similarly for ALTZONE, daylight saving time, and the altzone variable.
1324 This change is a companion to the tzname change in 2014h, and is
1325 designed to make timezone and altzone more compatible with tzname.
1327 The tz library's functions now set errno to EOVERFLOW if they fail
1328 because the result cannot be represented. ctime and ctime_r now
1329 return NULL and set errno when a timestamp is out of range, rather
1330 than having undefined behavior.
1332 Some bugs associated with the new 2014g functions have been fixed.
1333 This includes a bug that largely incapacitated the new functions
1334 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.)
1335 It also includes some uses of uninitialized variables after tzalloc.
1336 The new code uses the standard type 'ssize_t', which the Makefile
1337 now gives porting advice about.
1339 Changes affecting commentary
1341 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis).
1344 Release 2014h - 2014-09-25 18:59:03 -0700
1346 Changes affecting past timestamps
1348 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.
1350 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01,
1351 not 1920-01-06. The old entry was based on a misinterpretation of Shanks.
1353 Some more zones have been turned into links, when they differed
1354 from existing zones only for older timestamps. As usual,
1355 these changes affect UT offsets in pre-1970 timestamps only.
1356 Their old contents have been moved to the 'backzone' file.
1357 The affected zones are: Africa/Blantyre, Africa/Bujumbura,
1358 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
1359 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane.
1361 Changes affecting code
1363 zdump -V and -v now output gmtoff= values on all platforms,
1364 not merely on platforms defining TM_GMTOFF.
1366 The tz library's localtime and mktime functions now set tzname to a value
1367 appropriate for the requested timestamp, and zdump now uses this
1368 on platforms not defining TM_ZONE, fixing a 2014g regression.
1369 (Thanks to Tim Parenti for reporting the problem.)
1371 The tz library no longer sets tzname if localtime or mktime fails.
1373 zdump -c no longer mishandles transitions near year boundaries.
1374 (Thanks to Tim Parenti for reporting the problem.)
1376 An access to uninitialized data has been fixed.
1377 (Thanks to Jörg Richter for reporting the problem.)
1379 When THREAD_SAFE is defined, the code ports to the C11 memory model.
1380 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined
1381 and two threads race to initialize data used by gmtime-like functions.
1382 (Thanks to Andy Heninger for reporting the problems.)
1384 Changes affecting build procedure
1386 'make check' now checks better for properly-sorted data.
1388 Changes affecting documentation and commentary
1390 zdump's gmtoff=N output is now documented, and its isdst=D output
1391 is now documented to possibly output D values other than 0 or 1.
1393 zdump -c's treatment of years is now documented to use the
1394 Gregorian calendar and Universal Time without leap seconds,
1395 and its behavior at cutoff boundaries is now documented better.
1396 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.)
1398 Programs are now documented to use the proleptic Gregorian calendar.
1399 (Thanks to Alan Barrett for the suggestion.)
1401 Fractional-second GMT offsets have been documented for civil time
1402 in 19th-century Chennai, Jakarta, and New York.
1405 Release 2014g - 2014-08-28 12:31:23 -0700
1407 Changes affecting future timestamps
1409 Turks & Caicos is switching from US eastern time to UT -04
1410 year-round, modeled as a switch on 2014-11-02 at 02:00.
1411 [As noted in 2014j, this switch was later delayed.]
1413 Changes affecting past timestamps
1415 Time in Russia or the USSR before 1926 or so has been corrected by
1416 a few seconds in the following zones: Asia/Irkutsk,
1417 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi,
1418 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For
1419 Asia/Yekaterinburg the correction is a few minutes. (Thanks to
1420 Vladimir Karpinsky.)
1422 The Portuguese decree of 1911-05-26 took effect on 1912-01-01.
1423 This affects 1911 timestamps in Africa/Bissau, Africa/Luanda,
1424 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912
1425 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32.
1426 (Thanks to Stephen Colebourne for pointing to the decree.)
1428 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59.
1430 A new file 'backzone' contains data which may appeal to
1431 connoisseurs of old timestamps, although it is out of scope for
1432 the tz database, is often poorly sourced, and contains some data
1433 that is known to be incorrect. The new file is not recommended
1434 for ordinary use and its entries are not installed by default.
1435 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and
1436 Isle of Man entries.)
1438 Some more zones have been turned into links, when they differed
1439 from existing zones only for older timestamps. As usual,
1440 these changes affect UT offsets in pre-1970 timestamps only.
1441 Their old contents have been moved to the 'backzone' file.
1442 The affected zones are: Africa/Bangui, Africa/Brazzaville,
1443 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
1444 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
1446 Changes affecting code
1448 Unless NETBSD_INSPIRED is defined to 0, the tz library now
1449 supplies functions for creating and using objects that represent
1450 time zones. The new functions are tzalloc, tzfree, localtime_rz,
1451 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
1452 time2posix_z. They are intended for performance: for example,
1453 localtime_rz (unlike localtime_r) is trivially thread-safe without
1454 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired
1455 functions, and to Alan Barrett and Jonathan Lennox for helping to
1458 zdump now builds with the tz library unless USE_LTZ is defined to 0,
1459 This lets zdump use tz features even if the system library lacks them.
1460 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0
1461 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
1463 zdump now uses localtime_rz if available, as it's significantly faster,
1464 and it can help zdump better diagnose invalid time zone names.
1465 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ
1466 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is
1467 not available, zdump now uses localtime_r and tzset if available,
1468 as this is a bit cleaner and faster than plain localtime. Compile
1469 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
1470 lacks these two functions.
1472 If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
1473 Although not needed for tz's own applications, which are single-threaded,
1474 this supports POSIX better if the tz library is used in multithreaded apps.
1476 Some crashes have been fixed when zdump or the tz library is given
1477 invalid or outlandish input.
1479 The tz library no longer mishandles leap seconds on platforms with
1480 unsigned time_t in time zones that lack ordinary transitions after 1970.
1482 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
1483 already defined, to make it easier to configure on common platforms.
1484 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
1486 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
1487 assumes that reading uninitialized memory yields garbage values
1488 but does not cause other problems such as traps.
1490 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now
1491 more likely to guess right for ambiguous timestamps near
1492 transitions where tm_isdst does not change.
1494 If HAVE_STRFTIME_L is defined to 1, the tz library now defines
1495 strftime_l for compatibility with recent versions of POSIX.
1496 Only the C locale is supported, though. HAVE_STRFTIME_L defaults
1497 to 1 on recent POSIX versions, and to 0 otherwise.
1499 tzselect -c now uses a hybrid distance measure that works better
1500 in Africa. (Thanks to Alan Barrett for noting the problem.)
1502 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used,
1503 or when time_tz is defined.
1505 When HAVE_UTMPX_H is set the 'date' command now builds on systems
1506 whose <utmpx.h> file does not define WTMPX_FILE, and when setting
1507 the date it updates the wtmpx file if _PATH_WTMPX is defined.
1508 This affects GNU/Linux and similar systems.
1510 For easier maintenance later, some C code has been simplified,
1511 some lint has been removed, and the code has been tweaked so that
1512 plain 'make' is more likely to work.
1514 The C type 'bool' is now used for boolean values, instead of 'int'.
1516 The long-obsolete LOCALE_HOME code has been removed.
1518 The long-obsolete 'gtime' function has been removed.
1520 Changes affecting build procedure
1522 'zdump' no longer links in ialloc.o, as it's not needed.
1524 'make check_time_t_alternatives' no longer assumes GNU diff.
1526 Changes affecting distribution tarballs
1528 The files checktab.awk and zoneinfo2tdf.pl are now distributed in
1529 the tzdata tarball instead of the tzcode tarball, since they help
1530 maintain the data. The NEWS and Theory files are now also
1531 distributed in the tzdata tarball, as they're relevant for data.
1532 (Thanks to Alan Barrett for pointing this out.) Also, the
1533 leapseconds.awk file is no longer distributed in the tzcode
1534 tarball, since it belongs in the tzdata tarball (where 2014f
1535 inadvertently also distributed it).
1537 Changes affecting documentation and commentary
1539 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for
1540 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms
1543 The man pages have been updated to use function prototypes,
1544 to document thread-safe variants like localtime_r, and to document
1545 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and
1548 The fields in Link lines have been renamed to be more descriptive
1549 and more like the parameters of 'ln'. LINK-FROM has become TARGET,
1550 and LINK-TO has become LINK-NAME.
1552 tz-link.htm mentions the IETF's tzdist working group; Windows
1553 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
1555 Some broken URLs have been fixed in the commentary. (Thanks to
1558 Commentary about Philippines DST has been updated, and commentary
1559 on pre-1970 time in India has been added.
1562 Release 2014f - 2014-08-05 17:42:36 -0700
1564 Changes affecting future timestamps
1566 Russia will subtract an hour from most of its time zones on 2014-10-26
1567 at 02:00 local time. (Thanks to Alexander Krivenyshev.)
1568 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky
1569 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug
1570 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast
1571 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic
1572 (Europe/Samara) are not changing their clocks. The changed zones are
1573 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd,
1574 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk,
1575 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga,
1576 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours
1577 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected,
1578 but not its UTC offset. Two zones are added: Asia/Chita (split
1579 from Asia/Yakutsk, and also with two hours subtracted) and
1580 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour
1581 subtracted). (Thanks to Tim Parenti for much of the above.)
1583 Changes affecting time zone abbreviations
1585 Australian eastern time zone abbreviations are now AEST/AEDT not EST,
1586 and similarly for the other Australian zones. That is, for eastern
1587 standard and daylight saving time the abbreviations are AEST and AEDT
1588 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
1589 and AWST/AWDT are now used instead of the former CST, CWST, and WST.
1590 This change does not affect UT offsets, only time zone abbreviations.
1591 (Thanks to Rich Tibbett and many others.)
1593 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07)
1594 effective 2014-10-26 at 02:00 local time.
1596 The time zone abbreviation for Xinjiang Time (observed in Ürümqi)
1597 has been changed from URUT to XJT. (Thanks to Luther Ma.)
1599 Prefer MSK/MSD for Moscow time in Russia, even in other cities.
1600 Similarly, prefer EET/EEST for eastern European time in Russia.
1602 Change time zone abbreviations in (western) Samoa to use "ST" and
1603 "DT" suffixes, as this is more likely to match common practice.
1604 Prefix "W" to (western) Samoa time when its standard-time offset
1605 disagrees with that of American Samoa.
1607 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone.
1609 Time zone abbreviations have been updated for Japan's two time
1610 zones used 1896-1937. JWST now stands for Western Standard
1611 Time, and JCST for Central Standard Time (formerly this was CJT).
1612 These abbreviations are now used for time in Korea, Taiwan,
1613 and Sakhalin while controlled by Japan.
1615 Changes affecting past timestamps
1617 China's five zones have been simplified to two, since the post-1970
1618 differences in the other three seem to have been imaginary. The
1619 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been
1620 removed; backwards-compatibility links still work, albeit with
1621 different behaviors for timestamps before May 1980. Asia/Urumqi's
1622 1980 transition to UT +08 has been removed, so that it is now at
1623 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl;
1624 Treindl sent helpful translations of two papers by Guo Qingsheng.)
1626 Some zones have been turned into links, when they differed from existing
1627 zones only for older UT offsets where data entries were likely invented.
1628 These changes affect UT offsets in pre-1970 timestamps only. This is
1629 similar to the change in release 2013e, except this time for western
1630 Africa. The affected zones are: Africa/Bamako, Africa/Banjul,
1631 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,
1632 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and
1633 Atlantic/St_Helena. This also affects the backwards-compatibility
1634 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne,
1635 Tim Parenti, and David Patte for reporting problems in earlier
1636 versions of this change.)
1638 Asia/Shanghai's pre-standard-time UT offset has been changed from
1639 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its
1640 transition to standard time has been changed from 1928 to 1901.
1642 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01,
1643 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945.
1644 In 1946 it observed DST from 05-15 through 09-30; in 1947
1645 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30.
1646 (Thanks to Yu-Cheng Chuang.)
1648 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950.
1650 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not
1651 10-03 at 00:00. (Thanks to Konstantin Hyppönen.)
1653 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the
1654 period from 1911 to 1950.
1656 Pacific/Chatham has been changed to New Zealand standard time plus
1657 45 minutes for the period before 1957, reflecting a 1956 remark in
1658 the New Zealand parliament.
1660 Europe/Budapest has several pre-1946 corrections: in 1918 the transition
1661 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in
1662 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08
1663 not 04-06 at 02:00; and there was no DST in 1920.
1665 Africa/Accra is now assumed to have observed DST from 1920 through 1935.
1667 Time in Russia before 1927 or so has been corrected by a few seconds in
1668 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi,
1669 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and
1670 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0
1671 point. (Thanks to Vladimir Karpinsky for the Moscow changes.)
1673 Changes affecting data format
1675 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data.
1676 The new file's extended format allows multiple country codes per zone.
1677 The older file is still installed but is deprecated; its format is
1678 not changing and it will still be distributed for a while, but new
1679 applications should use the new file.
1681 The new file format simplifies maintenance of obscure locations.
1682 To test this, it adds coverage for the Crozet Islands and the
1683 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.)
1685 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8.
1686 It is still ASCII now, but commentary about the switch has been added.
1687 The new file 'zone1970.tab' already uses UTF-8.
1689 Changes affecting code
1691 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE
1692 is defined. (Thanks to Elliott Hughes for reporting the problem.)
1694 'zic' no longer mishandles input when ignoring case in locales that
1695 are not compatible with English, e.g., unibyte Turkish locales when
1696 compiled with HAVE_GETTEXT.
1698 Error diagnostics of 'zic' and 'yearistype' have been reworded so that
1699 they no longer use ASCII '-' as if it were a dash.
1701 'zic' now rejects output file names that contain '.' or '..' components.
1702 (Thanks to Tim Parenti for reporting the problem.)
1704 'zic -v' now warns about output file names that do not follow
1705 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur
1706 David Olson for starting the ball rolling on this.)
1708 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0.
1710 Changes affecting build procedure
1712 'zic' no longer links in localtime.o and asctime.o, as they're not needed.
1713 (Thanks to John Cochran.)
1715 Changes affecting documentation and commentary
1717 The 'Theory' file documents legacy names, the longstanding
1718 exceptions to the POSIX-inspired file name rules.
1720 The 'zic' documentation clarifies the role of time types when
1721 interpreting dates. (Thanks to Arthur David Olson.)
1723 Documentation and commentary now prefer UTF-8 to US-ASCII,
1724 allowing the use of proper accents in foreign words and names.
1725 Code and data have not changed because of this. (Thanks to
1726 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug
1729 Non-HTML documentation and commentary now use plain-text URLs instead of
1730 HTML insertions, and are more consistent about bracketing URLs when they
1731 are not already surrounded by white space. (Thanks to suggestions by
1734 There is new commentary about Xujiahui Observatory, the five time-zone
1735 project in China from 1918 to 1949, timekeeping in Japanese-occupied
1736 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the
1737 warlord Jin Shuren in the data.
1739 Commentary about the coverage of each Russian zone has been standardized.
1740 (Thanks to Tim Parenti).
1742 There is new commentary about contemporary timekeeping in Ethiopia.
1744 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed.
1746 There is new commentary about time in Poland in 1919.
1748 Proper credit has been given to DST inventor George Vernon Hudson.
1750 Commentary about time in Metlakatla, AK and Resolute, NU has been
1751 improved, with a new source for the former.
1753 In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it
1756 Commentary about permanent Antarctic bases has been updated.
1758 Several typos have been corrected. (Thanks to Tim Parenti for
1759 contributing some of these fixes.)
1761 tz-link.htm now mentions the JavaScript libraries Moment Timezone,
1762 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up
1763 from Matt Johnson.) Also, it mentions the Go 'latlong' package.
1764 (Thanks to a heads-up from Dirkjan Ochtman.)
1766 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998
1767 have been removed. These obsolescent US Naval Observatory entries were no
1768 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.)
1771 Release 2014e - 2014-06-12 21:53:52 -0700
1773 Changes affecting near-future timestamps
1775 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00.
1776 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily
1777 switch to standard time at 24:00 the last Thursday before Ramadan, and
1778 back to DST at 00:00 the first Friday after Ramadan.
1780 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks
1781 to Milamber Space Network.) Guess that from 2015 on Morocco will
1782 temporarily switch to standard time at 03:00 the last Saturday before
1783 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan.
1785 Changes affecting past timestamps
1787 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of
1788 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo
1789 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time
1790 in 1991. (Thanks to Hank W. for reporting the problems.)
1792 Changes affecting commentary
1794 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the
1795 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and
1796 removes stale pointers to World Time Explorer and WORLDTIME.
1799 Release 2014d - 2014-05-27 21:34:40 -0700
1801 Changes affecting code
1803 zic no longer generates files containing timestamps before the Big Bang.
1804 This works around GNOME bug 730332
1805 <https://bugzilla.gnome.org/show_bug.cgi?id=730332>.
1806 (Thanks to Leonardo Chiquitto for reporting the bug, and to
1807 Arthur David Olson and James Cloos for suggesting improvements to the fix.)
1809 Changes affecting documentation
1811 tz-link.htm now mentions GNOME.
1814 Release 2014c - 2014-05-13 07:44:13 -0700
1816 Changes affecting near-future timestamps
1818 Egypt observes DST starting 2014-05-15 at 24:00.
1819 (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
1820 Details have not been announced, except that DST will not be observed
1821 during Ramadan. Guess that DST will stop during the same Ramadan dates as
1822 Morocco, and that Egypt's future spring and fall transitions will be the
1823 same as 2010 when it last observed DST, namely April's last Friday at
1824 00:00 to September's last Thursday at 23:00 standard time. Also, guess
1825 that Ramadan transitions will be at 00:00 standard time.
1827 Changes affecting code
1829 zic now generates transitions for minimum time values, eliminating guesswork
1830 when handling low-valued timestamps. (Thanks to Arthur David Olson.)
1832 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.)
1834 Changes affecting commentary and documentation
1836 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.)
1839 Release 2014b - 2014-03-24 21:28:50 -0700
1841 Changes affecting near-future timestamps
1843 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time.
1844 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU.
1846 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and
1847 Bengt-Inge Larsson.) This is currently an approximation; a better version
1848 will require the zic and localtime fixes mentioned below, and the plan is
1849 to wait for a while until at least the zic fixes propagate.
1851 Changes affecting code
1853 'zic' and 'localtime' no longer reject locations needing four transitions
1854 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).)
1855 Also, 'zic' avoids some unlikely failures due to integer overflow.
1857 Changes affecting build procedure
1859 'make check' now detects Rule lines defined but never used.
1860 The NZAQ rules, an instance of this problem, have been removed.
1862 Changes affecting commentary and documentation
1864 Fix Tuesday/Thursday typo in description of time in Israel.
1865 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.)
1867 Microsoft Windows 8.1 doesn't support tz database names. (Thanks
1868 to Donald MacQueen.) Instead, the Microsoft Windows Store app
1869 library supports them.
1871 Add comments about Johnston Island time in the 1960s.
1872 (Thanks to Lyle McElhaney.)
1874 Morocco's 2014 DST start will be as predicted.
1875 (Thanks to Sebastien Willemijns.)
1878 Release 2014a - 2014-03-07 23:30:29 -0800
1880 Changes affecting near-future timestamps
1882 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for
1883 the heads-up, and to Tim Parenti for simplifying the update.)
1885 Changes affecting past timestamps
1887 Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00.
1888 (Thanks to Steffen Thorsen.)
1890 Ukraine switched from Moscow to Eastern European time on 1990-07-01
1891 (not 1992-01-01), and observed DST during the entire next winter.
1892 (Thanks to Vladimir in Moscow via Alois Treindl.)
1894 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03.
1895 (Thanks to Avigdor Finkelstein.)
1897 Changes affecting code
1899 A uninitialized-storage bug in 'localtime' has been fixed.
1900 (Thanks to Logan Chien.)
1902 Changes affecting the build procedure
1904 The settings for 'make check_web' now default to Ubuntu 13.10.
1906 Changes affecting commentary and documentation
1908 The boundary of the US Pacific time zone is given more accurately.
1909 (Thanks to Alan Mintz.)
1911 Chile's 2014 DST will be as predicted. (Thanks to José Miguel Garrido.)
1913 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Raúl Perasso.)
1915 Better descriptions of countries with same time zone history as
1916 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.)
1918 Several changes affect tz-link.htm, the main web page.
1920 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to
1923 Mention xCal (Internet RFC 6321) and jCal.
1925 Microsoft has some support for tz database names.
1927 CLDR data formats include both XML and JSON.
1929 Mention Maggiolo's map of solar vs standard time.
1930 (Thanks to Arthur David Olson.)
1932 Mention TZ4Net. (Thanks to Matt Johnson.)
1934 Mention the timezone-olson Haskell package.
1936 Mention zeitverschiebung.net. (Thanks to Martin Jäger.)
1938 Remove moribund links to daylight-savings-time.info and to
1939 Simple Timer + Clocks.
1941 Update two links. (Thanks to Oscar van Vlijmen.)
1943 Fix some formatting glitches, e.g., remove random newlines from
1944 abbr elements' title attributes.
1947 Release 2013i - 2013-12-17 07:25:23 -0800
1949 Changes affecting near-future timestamps:
1951 Jordan switches back to standard time at 00:00 on December 20, 2013.
1952 The 2006-2011 transition schedule is planned to resume in 2014.
1953 (Thanks to Steffen Thorsen.)
1955 Changes affecting past timestamps:
1957 In 2004, Cuba began DST on March 28, not April 4.
1958 (Thanks to Steffen Thorsen.)
1960 Changes affecting code
1962 The compile-time flag NOSOLAR has been removed, as nowadays the
1963 benefit of slightly shrinking runtime table size is outweighed by the
1964 cost of disallowing potential future updates that exceed old limits.
1966 Changes affecting documentation and commentary
1968 The files solar87, solar88, and solar89 are no longer distributed.
1969 They were a negative experiment - that is, a demonstration that
1970 tz data can represent solar time only with some difficulty and error.
1971 Their presence in the distribution caused confusion, as Riyadh
1972 civil time was generally not solar time in those years.
1974 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.)
1977 Release 2013h - 2013-10-25 15:32:32 -0700
1979 Changes affecting current and future timestamps:
1981 Libya has switched its UT offset back to +02 without DST, instead
1982 of +01 with DST. (Thanks to Even Scharning.)
1984 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules.
1985 (Thanks to Gwillim Law.)
1987 Changes affecting future timestamps:
1989 Acre and (we guess) western Amazonas will switch from UT -04 to -05
1990 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe.
1991 (Thanks to Steffen Thorsen.)
1993 Add entries for DST transitions in Morocco in the year 2038.
1994 This avoids some year-2038 glitches introduced in 2013g.
1995 (Thanks to Yoshito Umaoka for reporting the problem.)
1997 Changes affecting API
1999 The 'tzselect' command no longer requires the 'select' command,
2000 and should now work with /bin/sh on more platforms. It also works
2001 around a bug in BusyBox awk before version 1.21.0. (Thanks to
2002 Patrick 'P. J.' McDermott and Alan Barrett.)
2004 Changes affecting code
2006 Fix localtime overflow bugs with 32-bit unsigned time_t.
2008 zdump no longer assumes sscanf returns maximal values on overflow.
2010 Changes affecting the build procedure
2012 The builder can specify which programs to use, if any, instead of
2013 'ar' and 'ranlib', and libtz.a is now built locally before being
2014 installed. (Thanks to Michael Forney.)
2016 A dependency typo in the 'zdump' rule has been fixed.
2017 (Thanks to Andrew Paprocki.)
2019 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f'
2020 work as specified by POSIX.2-1992 or later; this is portable nowadays.
2022 'make clean' no longer removes 'leapseconds', since it's
2023 host-independent and is part of the distribution.
2025 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed.
2027 Changes affecting documentation and commentary
2029 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol
2030 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle).
2032 Update URLs in tz-link page. Add URLs for Microsoft Windows, since
2033 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no
2034 longer maintained) and for old advisories. SOFA now does C.
2036 Release 2013g - 2013-09-30 21:08:26 -0700
2038 Changes affecting current and near-future timestamps
2040 Morocco now observes DST from the last Sunday in March to the last
2041 Sunday in October, not April to September respectively. (Thanks
2042 to Steffen Thorsen.)
2044 Changes affecting 'zic'
2046 'zic' now runs on platforms that lack both hard links and symlinks.
2047 (Thanks to Theo Veenker for reporting the problem, for MinGW.)
2048 Also, fix some bugs on platforms that lack hard links but have symlinks.
2050 'zic -v' again warns that Asia/Tehran has no POSIX environment variable
2051 to predict the far future, fixing a bug introduced in 2013e.
2053 Changes affecting the build procedure
2055 The 'leapseconds' file is again put into the tzdata tarball.
2056 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to
2057 Matt Burgess and Ian Abbott.) The timestamps of these and other
2058 dependent files in tarballs are adjusted more consistently.
2060 Changes affecting documentation and commentary
2062 The README file is now part of the data tarball as well as the code.
2063 It now states that files are public domain unless otherwise specified.
2064 (Thanks to Andrew Main (Zefram) for asking for clarifications.)
2065 Its details about the 1989 release moved to a place of honor near
2069 Release 2013f - 2013-09-24 23:37:36 -0700
2071 Changes affecting near-future timestamps
2073 Tocantins will very likely not observe DST starting this spring.
2074 (Thanks to Steffen Thorsen.)
2076 Jordan will likely stay at UT +03 indefinitely, and will not fall
2079 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.)
2081 Changes affecting API
2083 The types of the global variables 'timezone' and 'altzone' (if present)
2084 have been changed back to 'long'. This is required for 'timezone'
2085 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11.
2086 These variables were originally 'long' in the tz code, but were
2087 mistakenly changed to 'time_t' in 1987; nobody reported the
2088 incompatibility until now. The difference matters on x32, where
2089 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.)
2091 Changes affecting the build procedure
2093 Avoid long strings in leapseconds.awk to work around a mawk bug.
2094 (Thanks to Cyril Baurand.)
2096 Changes affecting documentation and commentary
2098 New file 'NEWS' that contains release notes like this one.
2100 Paraguay's law does not specify DST transition time; 00:00 is customary.
2101 (Thanks to Waldemar Villamayor-Venialbo.)
2103 Minor capitalization fixes.
2105 Changes affecting version-control only
2107 The experimental GitHub repository now contains annotated and
2108 signed tags for recent releases, e.g., '2013e' for Release 2013e.
2109 Releases are tagged starting with 2012e; earlier releases were
2110 done differently, and tags would either not have a simple name or
2111 not exactly match what was released.
2113 'make set-timestamps' is now simpler and a bit more portable.
2116 Release 2013e - 2013-09-19 23:50:04 -0700
2118 Changes affecting near-future timestamps
2120 This year Fiji will start DST on October 27, not October 20.
2121 (Thanks to David Wheeler for the heads-up.) For now, guess that
2122 Fiji will continue to spring forward the Sunday before the fourth
2125 Changes affecting current and future time zone abbreviations
2127 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian
2128 time zone abbreviations since 1932. (Thanks to George Ziegler,
2129 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and
2130 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura,
2131 Asia/Makassar, and Asia/Pontianak.
2133 Use ART (UT -03, standard time), rather than WARST (also -03, but
2134 daylight saving time) for San Luis, Argentina since 2009.
2136 Changes affecting Godthåb timestamps after 2037 if version mismatch
2138 Allow POSIX-like TZ strings where the transition time's hour can
2139 range from -167 through 167, instead of the POSIX-required 0
2140 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the
2141 new Fiji rules. This is a more-compact way to represent
2142 far-future timestamps for America/Godthab, America/Santiago,
2143 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem,
2144 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by
2145 this change. (Derived from a suggestion by Arthur David Olson.)
2147 Allow POSIX-like TZ strings where daylight saving time is in
2148 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western
2149 Argentina Summer Time all year. This supports a more-compact way
2150 to represent the 2013d data for America/Argentina/San_Luis.
2151 Because of the change for San Luis noted above this change does not
2152 affect the current data. (Thanks to Andrew Main (Zefram) for
2153 suggestions that improved this change.)
2155 Where these two TZ changes take effect, there is a minor extension
2156 to the tz file format in that it allows new values for the
2157 embedded TZ-format string, and the tz file format version number
2158 has therefore been increased from 2 to 3 as a precaution.
2159 Version-2-based client code should continue to work as before for
2160 all timestamps before 2038. Existing version-2-based client code
2161 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format
2162 files, and typically works in practice even for timestamps after
2163 2037; the only known exception is America/Godthab.
2165 Changes affecting timestamps before 1970
2167 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects
2168 some errors before 1947.
2170 Some zones have been turned into links, when they differ from existing
2171 zones only in older data entries that were likely invented or that
2172 differ only in LMT or transitions from LMT. These changes affect
2173 only timestamps before 1943. The affected zones are:
2174 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica,
2175 America/Grenada, America/Guadeloupe, America/Marigot,
2176 America/Montserrat, America/St_Barthelemy, America/St_Kitts,
2177 America/St_Lucia, America/St_Thomas, America/St_Vincent,
2178 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for
2179 confirming that the old Europe/Vaduz zone was wrong and the new
2180 link is better for WWII-era times.)
2182 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects
2183 America/Cayman, America/Jamaica and America/Grand_Turk timestamps
2186 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46.
2187 This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks
2190 Change the date of the circa-1850 Zurich transition from 1849-09-12
2191 to 1853-07-16, overriding Shanks with data from Messerli about
2192 postal and telegraph time in Switzerland.
2194 Changes affecting time zone abbreviations before 1970
2196 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932,
2197 as Jakarta was called Batavia back then.
2199 Changes affecting API
2201 The 'zic' command now outputs a dummy transition when far-future
2202 data can't be summarized using a TZ string, and uses a 402-year
2203 window rather than a 400-year window. For the current data, this
2204 affects only the Asia/Tehran file. It does not affect any of the
2205 timestamps that this file represents, so zdump outputs the same
2206 information as before. (Thanks to Andrew Main (Zefram).)
2208 The 'date' command has a new '-r' option, which lets you specify
2209 the integer time to display, a la FreeBSD.
2211 The 'tzselect' command has two new options '-c' and '-n', which lets you
2212 select a zone based on latitude and longitude.
2214 The 'zic' command's '-v' option now warns about constructs that
2215 require the new version-3 binary file format. (Thanks to Arthur
2216 David Olson for the suggestion.)
2218 Support for floating-point time_t has been removed.
2219 It was always dicey, and POSIX no longer requires it.
2220 (Thanks to Eric Blake for suggesting to the POSIX committee to
2221 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy
2222 Heninger, Arthur David Olson, and Alois Treindl, for reporting
2223 bugs and elucidating some of the corners of the old floating-point
2226 The signatures of 'offtime', 'timeoff', and 'gtime' have been
2227 changed back to the old practice of using 'long' to represent UT
2228 offsets. This had been inadvertently and mistakenly changed to
2229 'int_fast32_t'. (Thanks to Christos Zoulas.)
2231 The code avoids undefined behavior on integer overflow in some
2232 more places, including gmtime, localtime, mktime and zdump.
2234 Changes affecting the zdump utility
2236 zdump now outputs "UT" when referring to Universal Time, not "UTC".
2237 "UTC" does not make sense for timestamps that predate the introduction
2238 of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen
2239 for clarifying UT vs UTC.)
2241 Data changes affecting behavior of tzselect and similar programs
2243 Country code BQ is now called the more-common name "Caribbean Netherlands"
2244 rather than the more-official "Bonaire, St Eustatius & Saba".
2246 Remove from zone.tab the names America/Montreal, America/Shiprock,
2247 and Antarctica/South_Pole, as they are equivalent to existing
2248 same-country-code zones for post-1970 timestamps. The data entries for
2249 these names are unchanged, so the names continue to work as before.
2251 Changes affecting code internals
2253 zic -c now runs way faster on 64-bit hosts when given large numbers.
2255 zic now uses vfprintf to avoid allocating and freeing some memory.
2257 tzselect now computes the list of continents from the data,
2258 rather than have it hard-coded.
2260 Minor changes pacify GCC 4.7.3 and GCC 4.8.1.
2262 Changes affecting the build procedure
2264 The 'leapseconds' file is now generated automatically from a
2265 new file 'leap-seconds.list', which is a copy of
2266 <ftp://ftp.nist.gov/pub/time/leap-seconds.list>
2267 A new source file 'leapseconds.awk' implements this.
2268 The goal is simplification of the future maintenance of 'leapseconds'.
2270 When building the 'posix' or 'right' subdirectories, if the
2271 subdirectory would be a copy of the default subdirectory, it is
2272 now made a symbolic link if that is supported. This saves about
2273 2 MB of file system space.
2275 The links America/Shiprock and Antarctica/South_Pole have been
2276 moved to the 'backward' file. This affects only nondefault builds
2277 that omit 'backward'.
2279 Changes affecting version-control only
2281 .gitignore now ignores 'date'.
2283 Changes affecting documentation and commentary
2285 Changes to the 'tzfile' man page
2287 It now mentions that the binary file format may be extended in
2288 future versions by appending data.
2290 It now refers to the 'zdump' and 'zic' man pages.
2292 Changes to the 'zic' man page
2294 It lists conditions that elicit a warning with '-v'.
2296 It says that the behavior is unspecified when duplicate names
2297 are given, or if the source of one link is the target of another.
2299 Its examples are updated to match the latest data.
2301 The definition of white space has been clarified slightly.
2302 (Thanks to Michael Deckers.)
2304 Changes to the 'Theory' file
2306 There is a new section about the accuracy of the tz database,
2307 describing the many ways that errors can creep in, and
2308 explaining why so many of the pre-1970 timestamps are wrong or
2309 misleading (thanks to Steve Allen, Lester Caine, and Garrett
2310 Wollman for discussions that contributed to this).
2312 The 'Theory' file describes LMT better (this follows a
2313 suggestion by Guy Harris).
2315 It refers to the 2013 edition of POSIX rather than the 2004 edition.
2317 It's mentioned that excluding 'backward' should not affect the
2318 other data, and it suggests at least one zone.tab name per
2319 inhabited country (thanks to Stephen Colebourne).
2321 Some longstanding restrictions on names are documented, e.g.,
2322 'America/New_York' precludes 'America/New_York/Bronx'.
2324 It gives more reasons for the 1970 cutoff.
2326 It now mentions which time_t variants are supported, such as
2327 signed integer time_t. (Thanks to Paul Goyette for reporting
2328 typos in an experimental version of this change.)
2330 (Thanks to Philip Newton for correcting typos in these changes.)
2332 Documentation and commentary is more careful to distinguish UT in
2333 general from UTC in particular. (Thanks to Steve Allen.)
2335 Add a better source for the Zurich 1894 transition.
2336 (Thanks to Pierre-Yves Berger.)
2338 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.)
2341 Release 2013d - 2013-07-05 07:38:01 -0700
2343 Changes affecting future timestamps:
2345 Morocco's midsummer transitions this year are July 7 and August 10,
2346 not July 9 and August 8. (Thanks to Andrew Paprocki.)
2348 Israel now falls back on the last Sunday of October.
2349 (Thanks to Ephraim Silverberg.)
2351 Changes affecting past timestamps:
2353 Specify Jerusalem's location more precisely; this changes the pre-1880
2356 Changing affecting metadata only:
2358 Fix typos in the entries for country codes BQ and SX.
2360 Changes affecting code:
2362 Rework the code to fix a bug with handling Australia/Macquarie on
2363 32-bit hosts (thanks to Arthur David Olson).
2365 Port to platforms like NetBSD, where time_t can be wider than long.
2367 Add support for testing time_t types other than the system's.
2368 Run 'make check_time_t_alternatives' to try this out.
2369 Currently, the tests fail for unsigned time_t;
2370 this should get fixed at some point.
2372 Changes affecting documentation and commentary:
2374 Deemphasize the significance of national borders.
2376 Update the zdump man page.
2378 Remove obsolete NOID comment (thanks to Denis Excoffier).
2380 Update several URLs and comments in the web pages.
2382 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler).
2384 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka).
2387 Release 2013c - 2013-04-19 16:17:40 -0700
2389 Changes affecting current and future timestamps:
2391 Palestine observed DST starting March 29, 2013. (Thanks to
2392 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST,
2393 with the predicted rules being the last Thursday in March at 24:00
2394 to the first Friday on or after September 21 at 01:00.
2396 Assume that the recent change to Paraguay's DST rules is permanent,
2397 by moving the end of DST to the 4th Sunday in March every year.
2398 (Thanks to Carlos Raúl Perasso.)
2400 Changes affecting past timestamps:
2402 Fix some historical data for Palestine to agree with that of
2403 timeanddate.com, as follows:
2405 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not
2408 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not
2411 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27.
2413 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2.
2415 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01.
2417 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00.
2419 Fix times of habitation for Macquarie to agree with the Tasmania
2420 Parks & Wildlife Service history, which indicates that permanent
2421 habitation was 1899-1919 and 1948 on.
2423 Changing affecting metadata only:
2425 Macquarie Island is politically part of Australia, not Antarctica.
2426 (Thanks to Tobias Conradi.)
2428 Sort Macquarie more-consistently with other parts of Australia.
2429 (Thanks to Tim Parenti.)
2432 Release 2013b - 2013-03-10 22:33:40 -0700
2434 Changes affecting current and future timestamps:
2436 Haiti uses US daylight-saving rules this year, and presumably future years.
2437 This changes timestamps starting today. (Thanks to Steffen Thorsen.)
2439 Paraguay will end DST on March 24 this year.
2440 (Thanks to Steffen Thorsen.) For now, assume it's just this year.
2442 Morocco does not observe DST during Ramadan;
2443 try to predict Ramadan in Morocco as best we can.
2444 (Thanks to Erik Homoet for the heads-up.)
2446 Changes affecting commentary:
2448 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS.
2449 Update URL for Solaris. Mention Internet RFC 6557.
2450 Update Internet RFCs 2445->5545, 2822->5322.
2451 Switch from FTP to HTTP for Internet RFCs.
2454 Release 2013a - 2013-02-27 09:20:35 -0800
2456 Change affecting binary data format:
2458 The zone offset at the end of version-2-format zone files is now
2459 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.)
2461 Changes affecting current and future timestamps:
2463 Chile's 2013 rules, and we guess rules for 2014 and later, will be
2464 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC.
2465 (Thanks to Steffen Thorsen and Robert Elz.)
2467 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen.
2468 (Thanks to Tobias Conradi and Arthur David Olson.)
2470 Many changes affect historical timestamps before 1940.
2471 These were deduced from: Milne J. Civil time. Geogr J. 1899
2472 Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>.
2474 Changes affecting the code:
2476 Fix zic bug that mishandled Egypt's 2010 changes (this also affected
2477 the data). (Thanks to Arthur David Olson.)
2479 Fix localtime bug when time_t is unsigned and data files were generated
2480 by a signed time_t system. (Thanks to Doug Bailey for reporting and
2481 to Arthur David Olson for fixing.)
2483 Allow the email address for bug reports to be set by the packager.
2484 The default is tz@iana.org, as before. (Thanks to Joseph S. Myers.)
2486 Update HTML checking to be compatible with Ubuntu 12.10.
2488 Check that files are a safe subset of ASCII. At some point we may
2489 relax this requirement to a safe subset of UTF-8. Without the
2490 check, some non-UTF-8 encodings were leaking into the distribution.
2494 Restore a comment about copyright notices that was inadvertently deleted.
2495 (Thanks to Arthur David Olson.)
2497 Improve the commentary about which districts observe what times
2498 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson).
2500 Add web page links to tz.js.
2502 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.)
2505 Release 2012j - 2012-11-12 18:34:49 -0800
2507 Libya moved to CET this weekend, but with DST planned next year.
2508 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.)
2510 Signatures now have the extension .asc, not .sign, as that's more
2511 standard. (Thanks to Phil Pennock.)
2513 The output of 'zdump --version', and of 'zic --version', now
2514 uses a format that is more typical for --version.
2515 (Thanks to Joseph S. Myers.)
2517 The output of 'tzselect --help', 'zdump --help', and 'zic --help'
2518 now uses tz@iana.org rather than the old elsie address.
2520 zic -v now complains about abbreviations that are less than 3
2521 or more than 6 characters, as per Posix. Formerly, it checked
2522 for abbreviations that were more than 3.
2524 'make public' no longer puts its temporary directory under /tmp,
2525 and uses the just-built zic rather than the system zic.
2527 Various fixes to documentation and commentary.
2530 Release 2012i - 2012-11-03 12:57:09 -0700
2532 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.)
2534 Linker flags can now be specified via LDFLAGS.
2535 AWK now defaults to 'awk', not 'nawk'.
2536 The shell in tzselect now defaults to /bin/bash, but this can
2537 be overridden by specifying KSHELL.
2538 The main web page now mentions the unofficial GitHub repository.
2539 (Thanks to Mike Frysinger.)
2541 Tarball signatures can now be built by running 'make signatures'.
2542 There are also new makefile rules 'tarballs', 'check_public', and
2543 separate makefile rules for each tarball and signature file.
2544 A few makefile rules are now more portable to strict POSIX.
2546 The main web page now lists the canonical IANA URL.
2549 Release 2012h - 2012-10-26 22:49:10 -0700
2551 Bahia no longer has DST. (Thanks to Kelley Cook.)
2553 Tocantins has DST. (Thanks to Rodrigo Severo.)
2555 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.)
2557 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.)
2561 More C modernization, except that at Arthur David Olson's suggestion
2562 the instances of 'register' were kept.
2565 Release 2012g - 2012-10-17 20:59:45 -0700
2567 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.)
2569 Palestine fall 2012. (Thanks to Steffen Thorsen.)
2573 To attack the version-number problem, this release ships the file
2574 'Makefile' (which contains the release number) in both the tzcode and
2575 the tzdata tarballs. The two Makefiles are identical, and should be
2576 identical in any matching pair of tarballs, so it shouldn't matter
2577 which order you extract the tarballs. Perhaps we can come up with a
2578 better version-number scheme at some point; this scheme does have the
2579 virtue of not adding more files.
2582 Release 2012f - 2012-09-12 23:17:03 -0700
2584 * australasia (Pacific/Fiji): Fiji DST is October 21 through January
2585 20 this year. (Thanks to Steffen Thorsen.)
2588 Release 2012e - 2012-08-02 20:44:55 -0700
2590 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14.
2591 (Thanks to Steffen Thorsen.)
2593 * Use a single version number for both code and data.
2595 * .gitignore: New file.
2597 * Remove trailing white space.
2600 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700
2602 Changes for Morocco's timestamps, which take effect in a couple of
2603 hours, along with infrastructure changes to accommodate how the tz
2604 code and data are released on IANA.
2607 Release data2012c - 2012-03-27 12:17:25 -0400
2610 Summer time changes for Morocco (to start late April 2012)
2613 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria
2616 Haiti following US/Canada rules for 2012 (and we're assuming,
2617 for now anyway, for the future).
2620 Release 2012b - 2012-03-02 12:29:15 +0700
2622 There is just one change to tzcode2012b (compared with 2012a):
2623 the Makefile that was accidentally included with 2012a has been
2624 replaced with the version that should have been there, which is
2625 identical with the previous version (from tzcode2011i).
2627 There are just two changes in tzdata2012b compared with 2012a.
2629 Most significantly, summer time in Cuba has been delayed 3 weeks
2630 (now starts April 1 rather than March 11). Since Mar 11 (the old start
2631 date, as listed in 2012a) is just a little over a week away, this
2634 Less importantly, an excess tab in one of the changes in zone.tab
2635 in 2012a has been removed.
2638 Release 2012a - 2012-03-01 18:28:10 +0700
2640 The changes in tzcode2012a (compared to the previous version, 2011i)
2641 are entirely to the README and tz-art.htm and tz-link.htm files, if
2642 none of those concern you, you can ignore the code update. The changes
2643 reflect the changed addresses for the mailing list and the code and
2644 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile
2645 has been added to tz-link.htm).
2647 In tzdata2012a (compared to the previous release, which was 2011n)
2648 the major changes are:
2649 Chile 2011/2012 and 2012/2013 summer time date adjustments.
2650 Falkland Islands onto permanent summer time (we're assuming for the
2651 foreseeable future, though 2012 is all we're fairly certain of.)
2652 Armenia has abolished Summer Time.
2653 Tokelau jumped the International Date Line back last December
2654 (just the same as their near neighbour, Samoa).
2655 America/Creston is a new zone for a small area of British Columbia
2656 There will be a leapsecond 2012-06-30 23:59:60 UTC.
2658 Other minor changes are:
2659 Corrections to 1918 Canadian summer time end dates.
2660 Updated URL for UK time zone history (in comments)
2661 A few typos in Le Corre's list of free French place names (comments)
2664 Release data2011n - 2011-10-30 14:57:54 +0700
2666 There are three changes of note - most urgently, Cuba (America/Havana)
2667 has extended summer time by two weeks, now to end on Nov 13, rather than
2668 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic
2669 (Europe/Tiraspol) decided not to split from the rest of Moldova after
2670 all, and consequently that zone has been removed (again) and reinstated
2671 in the "backward" file as a link to Europe/Chisinau. And third, the
2672 end date for Fiji's summer time this summer was moved forward from the
2673 earlier planned Feb 26, to Jan 22.
2675 Apart from that, Moldova (MD) returns to a single entry in zone.tab
2676 (and the incorrect syntax that was in the 2011m version of that file
2677 is so fixed - it would have been fixed in a different way had this
2678 change not happened - that's the "missing" sccs version id).
2681 Release data2011m - 2011-10-24 21:42:16 +0700
2683 In particular, the typos in comments in the data (2011-11-17 should have
2684 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that
2685 Tim Parenti noted) have been fixed, and the change for Ukraine has been
2686 made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to
2687 Tim Parenti, and also Denys Gavrysh)
2689 In addition, I added Europe/Tiraspol to zone.tab.
2691 This time, all the files have new version numbers... (including the files
2692 otherwise unchanged in 2011m that were changed in 2011l but didn't get new
2693 version numbers there...)
2696 Release data2011l - 2011-10-10 11:15:43 +0700
2698 There are just 2 changes that cause different generated tzdata files from
2699 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil
2700 is included, but commented out. Compared with the diff I sent out last week,
2701 this version also includes attributions for the sources for the changes
2702 (in much the same format as ado used, but the html tags have not been
2703 checked, verified, or used in any way at all, so if there are errors there,
2704 please let me know.)
2707 Release data2011k - 2011-09-20 17:54:03 -0400
2712 Release data2011j - 2011-09-12 09:22:49 -0400
2714 (contemporary changes for Samoa; past changes for Kenya, Uganda, and
2715 Tanzania); there are also two spelling corrections to comments in
2716 the australasia file (with thanks to Christos Zoulas).
2719 Release 2011i - 2011-08-29 05:56:32 -0400
2724 Release data2011h - 2011-06-15 18:41:48 -0400
2726 Russia and Curaçao changes
2729 Release 2011g - 2011-04-25 09:07:22 -0400
2731 update the rules for Egypt to reflect its abandonment of DST this year
2734 Release 2011f - 2011-04-06 17:14:53 -0400
2739 Release 2011e - 2011-03-31 16:04:38 -0400
2741 Morocco, Chile, and tz-link changes
2744 Release 2011d - 2011-03-14 09:18:01 -0400
2746 changes that impact present-day timestamps in Cuba, Samoa, and Turkey
2749 Release 2011c - 2011-03-07 09:30:09 -0500
2751 These do affect current timestamps in Chile and Annette Island, Canada.
2754 Release 2011b - 2011-02-07 08:44:50 -0500
2759 Release 2011a - 2011-01-24 10:30:16 -0500
2764 Release data2010o - 2010-11-01 09:18:23 -0400
2766 change to the end of DST in Fiji in 2011
2769 Release 2010n - 2010-10-25 08:19:17 -0400
2774 Release 2010m - 2010-09-27 09:24:48 -0400
2776 Hong Kong, Vostok, and zic.c changes
2779 Release 2010l - 2010-08-16 06:57:25 -0400
2784 Release 2010k - 2010-07-26 10:42:27 -0400
2789 Release 2010j - 2010-05-10 09:07:48 -0400
2791 changes for Bahía de Banderas and for version naming
2794 Release data2010i - 2010-04-16 18:50:45 -0400
2796 the end of DST in Morocco on 2010-08-08
2799 Release data2010h - 2010-04-05 09:58:56 -0400
2804 Release data2010g - 2010-03-24 11:14:53 -0400
2809 Release 2010f - 2010-03-22 09:45:46 -0400
2814 Release data2010e - 2010-03-08 14:24:27 -0500
2816 corrects the Dhaka bug found by Danvin Ruangchan
2819 Release data2010d - 2010-03-06 07:26:01 -0500
2824 Release 2010c - 2010-03-01 09:20:58 -0500
2826 changes including KRE's suggestion for earlier initialization of
2827 "goahead" and "goback" structure elements
2830 Release code2010a - 2010-02-16 10:40:04 -0500
2835 Release data2010b - 2010-01-20 12:37:01 -0500
2840 Release data2010a - 2010-01-18 08:30:04 -0500
2845 Release data2009u - 2009-12-26 08:32:28 -0500
2847 changes to DST in Bangladesh
2850 Release 2009t - 2009-12-21 13:24:27 -0500
2855 Release data2009s - 2009-11-14 10:26:32 -0500
2857 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change
2860 Release 2009r - 2009-11-09 10:10:31 -0500
2862 "antarctica" and "tz-link.htm" changes
2865 Release 2009q - 2009-11-02 09:12:40 -0500
2867 with two corrections as reported by Eric Muller and Philip Newton
2870 Release data2009p - 2009-10-23 15:05:27 -0400
2872 Argentina (including San Luis) changes (with the correction from
2876 Release data2009o - 2009-10-14 16:49:38 -0400
2878 Samoa (commentary only), Pakistan, and Bangladesh changes
2881 Release data2009n - 2009-09-22 15:13:38 -0400
2883 added commentary for Argentina and a change to the end of DST in
2887 Release data2009m - 2009-09-03 10:23:43 -0400
2889 Samoa and Palestine changes
2892 Release data2009l - 2009-08-14 09:13:07 -0400
2894 Samoa (comments only) and Egypt
2897 Release 2009k - 2009-07-20 09:46:08 -0400
2902 Release data2009j - 2009-06-15 06:43:59 -0400
2904 Bangladesh change (with a short turnaround since the DST change is
2908 Release 2009i - 2009-06-08 09:21:22 -0400
2910 updating for DST in Bangladesh this year
2913 Release 2009h - 2009-05-26 09:19:14 -0400
2918 Release data2009g - 2009-04-20 16:34:07 -0400
2923 Release data2009f - 2009-04-10 11:00:52 -0400
2925 correct DST in Pakistan
2928 Release 2009e - 2009-04-06 09:08:11 -0400
2933 Release 2009d - 2009-03-23 09:38:12 -0400
2935 Morocco, Tunisia, Argentina, and American Astronomical Society changes
2938 Release data2009c - 2009-03-16 09:47:51 -0400
2940 change to the start of Cuban DST
2943 Release 2009b - 2009-02-09 11:15:22 -0500
2948 Release 2009a - 2009-01-21 10:09:39 -0500
2953 Release data2008i - 2008-10-21 12:10:25 -0400
2955 southamerica and zone.tab files, with Argentina DST rule changes and
2956 United States zone reordering and recommenting
2959 Release 2008h - 2008-10-13 07:33:56 -0400
2964 Release 2008g - 2008-10-06 09:03:18 -0400
2966 Fix a broken HTML anchor and update Brazil's DST transitions;
2967 there's also a slight reordering of information in tz-art.htm.
2970 Release data2008f - 2008-09-09 22:33:26 -0400
2975 Release 2008e - 2008-07-28 14:11:17 -0400
2977 changes by Arthur David Olson and Jesper Nørgaard Welen
2980 Release data2008d - 2008-07-07 09:51:38 -0400
2982 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo
2985 Release data2008c - 2008-05-19 17:48:03 -0400
2987 Pakistan, Morocco, and Mongolia
2990 Release data2008b - 2008-03-24 08:30:59 -0400
2992 including renaming Asia/Calcutta to Asia/Kolkata, with a backward
2996 Release 2008a - 2008-03-08 05:42:16 -0500
3001 Release 2007k - 2007-12-31 10:25:22 -0500
3003 most importantly, changes to the "southamerica" file based on
3004 Argentina's readoption of daylight saving time
3007 Release 2007j - 2007-12-03 09:51:01 -0500
3009 1. eliminate the "P" (parameter) macro;
3011 2. the "noncontroversial" changes circulated on the time zone
3012 mailing list (less the changes to "logwtmp.c");
3014 3. eliminate "too many transition" errors when "min" is used in time
3017 4. changes by Paul Eggert (including updated information for Venezuela).
3020 Release data2007i - 2007-10-30 10:28:11 -0400
3022 changes for Cuba and Syria
3025 Release 2007h - 2007-10-01 10:05:51 -0400
3027 changes by Paul Eggert, as well as an updated link to the ICU
3028 project in tz-link.htm
3031 Release 2007g - 2007-08-20 10:47:59 -0400
3033 changes by Paul Eggert
3035 The "leapseconds" file has been updated to incorporate the most
3036 recent International Earth Rotation and Reference Systems Service
3039 There's an addition to tz-art.htm regarding the television show "Medium".
3042 Release 2007f - 2007-05-07 10:46:46 -0400
3044 changes by Paul Eggert (including Haiti, Turks and Caicos, and New
3047 changes to zic.c to allow hour values greater than 24 (along with
3048 Paul's improved time value overflow checking)
3051 Release 2007e - 2007-04-02 10:11:52 -0400
3053 Syria and Honduras changes by Paul Eggert
3055 zic.c variable renaming changes by Arthur David Olson
3058 Release 2007d - 2007-03-20 08:48:30 -0400
3060 changes by Paul Eggert
3062 the elimination of white space at the ends of lines
3065 Release 2007c - 2007-02-26 09:09:37 -0500
3067 changes by Paul Eggert
3070 Release 2007b - 2007-02-12 09:34:20 -0500
3072 Paul Eggert's proposed change to the quotation handling logic in zic.c.
3074 changes to the commentary in "leapseconds" reflecting the IERS
3075 announcement that there is to be no positive leap second at the end
3079 Release 2007a - 2007-01-08 12:28:29 -0500
3081 changes by Paul Eggert
3083 Derick Rethan's Asmara change
3085 Oscar van Vlijmen's Easter Island local mean time change
3087 symbolic link changes
3090 Release 2006p - 2006-11-27 08:54:27 -0500
3092 changes by Paul Eggert
3095 Release 2006o - 2006-11-06 09:18:07 -0500
3097 changes by Paul Eggert
3100 Release 2006n - 2006-10-10 11:32:06 -0400
3102 changes by Paul Eggert
3105 Release 2006m - 2006-10-02 15:32:35 -0400
3107 changes for Uruguay, Palestine, and Egypt by Paul Eggert
3109 (minimalist) changes to zic.8 to clarify "until" information
3112 Release data2006l - 2006-09-18 12:58:11 -0400
3114 Paul's best-effort work on this coming weekend's Egypt time change
3117 Release 2006k - 2006-08-28 12:19:09 -0400
3119 changes by Paul Eggert
3122 Release 2006j - 2006-08-21 09:56:32 -0400
3124 changes by Paul Eggert
3127 Release code2006i - 2006-08-07 12:30:55 -0400
3131 Ken Pizzini's conversion script
3134 Release code2006h - 2006-07-24 09:19:37 -0400
3136 adds public domain notices to four files
3138 includes a fix for transition times being off by a second
3140 adds a new recording to the "arts" file (information courtesy Colin Bowern)
3143 Release 2006g - 2006-05-08 17:18:09 -0400
3145 northamerica changes by Paul Eggert
3148 Release 2006f - 2006-05-01 11:46:00 -0400
3150 a missing version number problem is fixed (with thanks to Bradley
3151 White for catching the problem)
3154 Release 2006d - 2006-04-17 14:33:43 -0400
3156 changes by Paul Eggert
3158 added new items to tz-arts.htm that were found by Paul
3161 Release 2006c - 2006-04-03 10:09:32 -0400
3163 two sets of data changes by Paul Eggert
3165 a fencepost error fix in zic.c
3167 changes to zic.c and the "europe" file to minimize differences
3168 between output produced by the old 32-bit zic and the new 64-bit
3172 Release 2006b - 2006-02-20 10:08:18 -0500
3173 [tz32code2006b + tz64code2006b + tzdata2006b]
3177 All SCCS IDs were bumped to "8.1" for this release.
3180 Release 2006a - 2006-01-30 08:59:31 -0500
3182 changes by Paul Eggert (in particular, Indiana time zone moves)
3184 an addition to the zic manual page to describe how special-case
3185 transitions are handled
3188 Release 2005r - 2005-12-27 09:27:13 -0500
3190 Canadian changes by Paul Eggert
3192 They also add "<pre>" directives to time zone data files and reflect
3193 changes to warning message logic in "zdump.c" (but with calls to
3194 "gettext" kept unbundled at the suggestion of Ken Pizzini).
3197 Release 2005q - 2005-12-13 09:17:09 -0500
3199 Nothing earth-shaking here:
3200 1. Electronic mail addresses have been removed.
3201 2. Casts of the return value of exit have been removed.
3202 3. Casts of the argument of is.* macros have been added.
3203 4. Indentation in one section of zic.c has been fixed.
3204 5. References to dead URLs in the data files have been dealt with.
3207 Release 2005p - 2005-12-05 10:30:53 -0500
3209 "systemv", "tz-link.htm", and "zdump.c" changes
3210 (less the casts of arguments to the is* macros)
3213 Release 2005o - 2005-11-28 10:55:26 -0500
3215 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert
3217 zdump.c lint fixes by Arthur David Olson
3220 Release 2005n - 2005-10-03 09:44:09 -0400
3222 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan
3226 Release 2005m - 2005-08-29 12:15:40 -0400
3228 changes by Paul Eggert (with a small tweak to the tz-art change)
3230 a declaration of an unused variable has been removed from zdump.c
3233 Release 2005l - 2005-08-22 12:06:39 -0400
3235 changes by Paul Eggert
3237 overflow/underflow checks by Arthur David Olson, minus changes to
3238 the "Theory" file about the pending addition of 64-bit data (I grow
3239 less confident of the changes being accepted with each passing day,
3240 and the changes no longer increase the data files nine-fold--there's
3241 less than a doubling in size by my local Sun's reckoning)
3244 Release 2005k - 2005-07-14 14:14:24 -0400
3246 The "leapseconds" file has been edited to reflect the recently
3247 announced leap second at the end of 2005.
3249 I've also deleted electronic mail addresses from the files as an
3253 Release 2005j - 2005-06-13 14:34:13 -0400
3255 These reflect changes to limit the length of time zone abbreviations
3256 and the characters used in those abbreviations.
3258 There are also changes to handle POSIX-style "quoted" time zone
3259 environment variables.
3261 The changes were circulated on the time zone mailing list; the only
3262 change since then was the removal of a couple of minimum-length of
3263 abbreviation checks.
3266 Release data2005i - 2005-04-21 15:04:16 -0400
3268 changes (most importantly to Nicaragua and Haiti) by Paul Eggert
3271 Release 2005h - 2005-04-04 11:24:47 -0400
3273 changes by Paul Eggert
3275 minor changes to Makefile and zdump.c to produce more useful output
3276 when doing a "make typecheck"
3279 Release 2005g - 2005-03-14 10:11:21 -0500
3281 changes by Paul Eggert (a change to current DST rules in Uruguay and
3282 an update to a link to time zone software)
3285 Release 2005f - 2005-03-01 08:45:32 -0500
3287 data and documentation changes by Paul Eggert
3290 Release 2005e - 2005-02-10 15:59:44 -0500
3295 Release code2005d - 2005-01-31 09:21:47 -0500
3297 make zic complain about links to links if the -v flag is used
3299 have "make public" do more code checking
3301 add an include to "localtime.c" for the benefit of gcc systems
3304 Release 2005c - 2005-01-17 18:36:29 -0500
3306 get better results when mktime runs on a system where time_t is double
3308 changes to the data files (most importantly to Paraguay)
3311 Release 2005b - 2005-01-10 09:19:54 -0500
3313 Get localtime and gmtime working on systems with exotic time_t types.
3315 Update the leap second commentary in the "leapseconds" file.
3318 Release 2005a - 2005-01-01 13:13:44 -0500
3323 Release code2004i - 2004-12-14 13:42:58 -0500
3325 Deal with systems where time_t is unsigned.
3328 Release code2004h - 2004-12-07 11:40:18 -0500
3330 64-bit-time_t changes
3333 Release 2004g - 2004-11-02 09:06:01 -0500
3335 update to Cuba (taking effect this weekend)
3337 other changes by Paul Eggert
3339 correction of the spelling of Oslo
3341 changed versions of difftime.c and private.h
3344 Release code2004f - 2004-10-21 10:25:22 -0400
3346 Cope with wide-ranging tm_year values.
3349 Release 2004e - 2004-10-11 14:47:21 -0400
3351 Brazil/Argentina/Israel changes by Paul Eggert
3353 changes to tz-link.htm by Paul
3355 one small fix to Makefile
3358 Release 2004d - 2004-09-22 08:27:29 -0400
3360 Avoid overflow problems when TM_YEAR_BASE is added to an integer.
3363 Release 2004c - 2004-08-11 12:06:26 -0400
3365 asctime-related changes
3367 (variants of) some of the documentation changes suggested by Paul Eggert
3370 Release 2004b - 2004-07-19 14:33:35 -0400
3372 data changes by Paul Eggert - most importantly, updates for Argentina
3375 Release 2004a - 2004-05-27 12:00:47 -0400
3377 changes by Paul Eggert
3379 Handle DST transitions that occur at the end of a month in some
3380 years but at the start of the following month in other years.
3382 Add a copy of the correspondence that's the basis for claims about
3383 DST in the Navajo Nation.
3386 Release 2003e - 2003-12-15 09:36:47 -0500
3388 changes by Arthur David Olson (primarily code changes)
3390 changes by Paul Eggert (primarily data changes)
3392 minor changes to "Makefile" and "northamerica" (in the latter case,
3393 optimization of the "Toronto" rules)
3396 Release 2003d - 2003-10-06 09:34:44 -0400
3398 changes by Paul Eggert
3401 Release 2003c - 2003-09-16 10:47:05 -0400
3403 Fix bad returns in zic.c's inleap function.
3404 Thanks to Bradley White for catching the problem!
3407 Release 2003b - 2003-09-16 07:13:44 -0400
3409 Add a "--version" option (and documentation) to the zic and zdump commands.
3411 changes to overflow/underflow checking in zic
3413 a localtime typo fix.
3415 Update the leapseconds and tz-art.htm files.
3418 Release 2003a - 2003-03-24 09:30:54 -0500
3420 changes by Paul Eggert
3422 a few additions and modifications to the tz-art.htm file
3425 Release 2002d - 2002-10-15 13:12:42 -0400
3427 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab
3429 There's also a new time zone quote in "tz-art.htm".
3432 Release 2002c - 2002-04-04 11:55:20 -0500
3434 changes by Paul Eggert
3436 Change zic.c to avoid creating symlinks to files that don't exist.
3439 Release 2002b - 2002-01-28 12:56:03 -0500
3441 [These change notes are for Release 2002a, which was corrupted.
3442 2002b was a corrected version of 2002a.]
3444 changes by Paul Eggert
3446 Update the "leapseconds" file to note that there'll be no leap
3447 second at the end of June, 2002.
3449 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone.
3451 Change to "difftime.c" to avoid sizeof problems.
3454 Release 2001d - 2001-10-09 13:31:32 -0400
3456 changes by Paul Eggert
3459 Release 2001c - 2001-06-05 13:59:55 -0400
3461 changes by Paul Eggert and Andrew Brown
3464 Release 2001b - 2001-04-05 16:44:38 -0400
3466 changes by Paul Eggert (modulo jnorgard's typo fix)
3468 tz-art.htm has been HTMLified.
3471 Release 2001a - 2001-03-13 12:57:44 -0500
3473 changes by Paul Eggert
3475 An addition to the "leapseconds" file: comments with the text of the
3476 latest IERS leap second notice.
3478 Trailing white space has been removed from data file lines, and
3479 repeated spaces in "Rule Jordan" lines in the "asia" file have been
3483 Release 2000h - 2000-12-14 15:33:38 -0500
3485 changes by Paul Eggert
3487 one typo fix in the "art" file
3489 With providence, this is the last update of the millennium.
3492 Release 2000g - 2000-10-10 11:35:22 -0400
3494 changes by Paul Eggert
3496 correction of John Mackin's name submitted by Robert Elz
3498 Garry Shandling's Daylight Saving Time joke (!?!) from the recent
3499 Emmy Awards broadcast.
3502 Release 2000f - 2000-08-10 09:31:58 -0400
3504 changes by Paul Eggert
3506 Added information in "tz-art.htm" on a Seinfeld reference to DST.
3508 Error checking and messages in the "yearistype" script have been
3512 Release 2000e - 2000-07-31 09:27:54 -0400
3514 data changes by Paul Eggert
3516 a change to the default value of the defined constant HAVE_STRERROR
3518 the addition of a Dave Barry quote on DST to the tz-arts file
3521 Release 2000d - 2000-04-20 15:43:04 -0400
3523 changes to the documentation and code of strftime for C99 conformance
3525 a bug fix for date.c
3527 These are based on (though modified from) changes by Paul Eggert.
3530 Release 2000c - 2000-03-04 10:31:43 -0500
3532 changes by Paul Eggert
3535 Release 2000b - 2000-02-21 12:16:29 -0500
3537 changes by Paul Eggert and Joseph Myers
3539 modest tweaks to the tz-art.htm and tz-link.htm files
3542 Release 2000a - 2000-01-18 09:21:26 -0500
3544 changes by Paul Eggert
3546 The two hypertext documents have also been renamed.
3549 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500
3551 Paul Eggert's changes
3553 additions to the "zic" manual page and the "Arts.htm" file
3556 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500
3561 Release data1999h - 1999-10-07 03:50:29 -0400
3563 changes by Paul Eggert to "europe" (most importantly, fixing
3564 Lithuania and Estonia)
3567 Release 1999g - 1999-09-28 11:06:18 -0400
3569 data changes by Paul Eggert (most importantly, the change for
3570 Lebanon that buys correctness for this coming Sunday)
3572 The "code" file contains changes to "Makefile" and "checktab.awk" to
3573 allow better checking of time zone files before they are published.
3576 Release 1999f - 1999-09-23 09:48:14 -0400
3578 changes by Arthur David Olson and Paul Eggert
3581 Release 1999e - 1999-08-17 15:20:54 -0400
3583 changes circulated by Paul Eggert, although the change to handling
3584 of DST-specifying time zone names has been commented out for now
3585 (search for "XXX" in "localtime.c" for details). These files also
3586 do not make any changes to the start of DST in Brazil.
3588 In addition to Paul's changes, there are updates to "Arts.htm" and
3592 Release 1999d - 1999-03-30 11:31:07 -0500
3594 changes by Paul Eggert
3596 The Makefile's "make public" rule has also been changed to do a test
3597 compile of each individual time zone data file (which should help
3598 avoid problems such as the one we had with Nicosia).
3601 Release 1999c - 1999-03-25 09:47:47 -0500
3603 changes by Paul Eggert, most importantly the change for Chile.
3606 Release 1999b - 1999-02-01 17:51:44 -0500
3608 changes by Paul Eggert
3610 code changes (suggested by Mani Varadarajan, mani at be.com) for
3611 correct handling of symbolic links when building using a relative directory
3613 code changes to generate correct messages for failed links
3615 updates to the URLs in Arts.htm
3618 Release 1999a - 1999-01-19 16:20:29 -0500
3620 error message internationalizations and corrections in zic.c and
3621 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz,
3625 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400
3627 changes for Brazil, Chile, and Germany
3629 support for use of "24:00" in the input files for the time zone compiler
3632 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400
3634 changes by Paul Eggert
3636 correction to a define in the "private.h" file
3639 Release data1998g - 1998-08-11 03:28:35 -0000
3640 [tzdata1998g.tar.gz is missing!]
3642 Lithuanian change provided by mgedmin at pub.osf.it
3644 Move creation of the GMT link with Etc/GMT to "etcetera" (from
3645 "backward") to ensure that the GMT file is created even where folks
3646 don't want the "backward" links (as suggested by Paul Eggert).
3649 Release data1998f - 1998-07-20 13:50:00 -0000
3650 [tzdata1998f.tar.gz is missing!]
3652 Update the "leapseconds" file to include the newly-announced
3653 insertion at the end of 1998.
3656 Release code1998f - 1998-06-01 10:18:31 -0400
3658 addition to localtime.c by Guy Harris
3661 Release 1998e - 1998-05-28 09:56:26 -0400
3663 The Makefile is changed to produce zoneinfo-posix rather than
3664 zoneinfo/posix, and to produce zoneinfo-leaps rather than
3667 data changes by Paul Eggert
3669 changes from Guy Harris to provide asctime_r and ctime_r
3671 A usno1998 file (substantially identical to usno1997) has been added.
3674 Release 1998d - 1998-05-14 11:58:34 -0400
3676 changes to comments (in particular, elimination of references to CIA maps).
3677 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places
3678 where changes occur.
3681 Release 1998c - 1998-02-28 12:32:26 -0500
3683 changes by Paul Eggert (save the "French correction," on which I'll
3684 wait for the dust to settle)
3688 changes and additions to Arts.htm
3691 Release 1998b - 1998-01-17 14:31:51 -0500
3693 URL cleanups and additions
3696 Release 1998a - 1998-01-13 12:37:35 -0500
3698 changes by Paul Eggert
3701 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500
3703 changes by Paul Eggert, with minor modifications from Arthur David
3704 Olson to make the files more browser friendly
3707 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500
3709 minor changes to put "TZif" at the start of each time zone information file
3711 a rule has also been added to the Makefile so you can
3713 to just recompile the zone information files (rather than doing a
3714 full "make install" with its other effects).
3717 Release data1997i - 1997-10-07 08:45:38 -0400
3719 changes to Africa by Paul Eggert
3722 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400
3724 corrections for Uruguay (and other locations)
3726 Arthur David Olson's simple-minded fix allowing mktime to both
3727 correctly handle leap seconds and correctly handle tm_sec values
3728 upon which arithmetic has been performed.
3731 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400
3733 Paul Eggert's updates
3735 a small change to a function prototype;
3737 "Music" has been renamed "Arts.htm", HTMLified, and augmented to
3738 include information on Around the World in Eighty Days.
3741 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400
3743 fixes to zic's error handling
3745 changes inspired by the item circulated on Slovenia
3747 The description of Web resources has been HTMLified for browsing
3750 A new piece of tz-related music has been added to the "Music" file.
3753 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500
3755 Paul Eggert's latest suggestions
3758 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500
3760 changes to "zic.c" to correct performance of the "-s" option
3762 a new file "usno1997"
3765 Release data1997c - 1997-03-04 09:58:18 -0500
3770 Release 1997b - 1997-02-27 18:34:19 -0500
3772 The data file incorporates the 1997 leap second.
3774 The code file incorporates Arthur David Olson's take on the
3775 zic/multiprocessor/directory-creation situation.
3778 Release 1997a - 1997-01-21 09:11:10 -0500
3780 Paul Eggert's Antarctica (and other changes)
3782 Arthur David Olson finessed the "getopt" issue by checking against
3783 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1
3784 is returned while SunOS 5.5's manual says EOF is returned).
3787 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500
3789 Paul Eggert's latest changes
3792 Release code1996n - 1996-12-16 09:42:02 -0500
3794 link snapping fix from Bruce Evans (via Garrett Wollman)
3797 Release data1996m - 1996-11-24 02:37:34 -0000
3798 [tzdata1996m.tar.gz is missing!]
3800 Paul Eggert's batch of changes
3803 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500
3805 No functional changes here; the files have simply been changed to
3806 make more use of ISO style dates in comments. The names of the above
3807 files now include the year in full.
3810 Release code96l - 1996-09-08 17:12:20 -0400
3812 tzcode96k was missing a couple of pieces.
3815 Release 96k - 1996-09-08 16:06:22 -0400
3817 the latest round of changes from Paul Eggert
3819 the recent Year 2000 material
3822 Release code96j - 1996-07-30 13:18:53 -0400
3824 Set sp->typecnt as suggested by Timothy Patrick Murphy.
3827 Release code96i - 1996-07-27 20:11:35 -0400
3829 Paul's suggested patch for strftime %V week numbers
3832 Release data96i - 1996-07-01 18:13:04 -0400
3834 "northamerica" and "europe" changes by Paul Eggert
3837 Release code96h - 1996-06-05 08:02:21 -0400
3839 fix for handling transitions specified in Universal Time
3841 Some "public domain" notices have also been added.
3844 Release code96g - 1996-05-16 14:00:26 -0400
3846 fix for the simultaneous-DST-and-zone-change challenge
3849 Release data96h - 1996-05-09 17:40:51 -0400
3851 changes by Paul Eggert
3854 Release code96f-data96g - 1996-05-03 03:09:59 -0000
3855 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!]
3857 The changes get us some of the way to fixing the problems noted in Paul
3858 Eggert's letter yesterday (in addition to a few others). The approach
3859 has been to make zic a bit smarter about figuring out what time zone
3860 abbreviations apply just after the time specified in the "UNTIL" part
3861 of a zone line. Putting the smarts in zic means avoiding having
3862 transition times show up in both "Zone" lines and "Rule" lines, which
3863 in turn avoids multiple transition time entries in time zone files.
3864 (This also makes the zic input files such as "europe" a bit shorter and
3865 should ease maintenance.)
3868 Release data96f - 1996-04-19 19:20:03 -0000
3869 [tzdata96f.tar.gz is missing!]
3871 The only changes are to the "northamerica" file; the time zone
3872 abbreviation for Denver is corrected to MST (and MDT), and the
3873 comments for Mexico have been updated.
3876 Release data96e - 1996-03-19 17:37:26 -0500
3878 Proposals by Paul Eggert, in particular the Portugal change that
3879 comes into play at the end of this month.
3882 Release data96d - 1996-03-18 20:49:39 -0500
3887 Release code96e - 1996-02-29 15:43:27 -0000
3888 [tzcode96e.tar.gz is missing!]
3890 internationalization changes and the fix to the documentation for strftime
3893 Release code96d-data96c - 1996-02-12 11:05:27 -0500
3895 The "code" file simply updates Bob Kridle's electronic address.
3897 The "data" file updates rules for Mexico.
3900 Release data96b - 1996-01-27 15:44:42 -0500
3905 Release code96c - 1996-01-16 16:58:15 -0500
3907 leap-year streamlining and binary-search changes
3912 Release code96b - 1996-01-10 20:42:39 -0500
3914 fixes and enhancements from Paul Eggert, including code that
3915 emulates the behavior of recent versions of the SunOS "date"
3919 Release 96a - 1996-01-06 09:08:24 -0500
3923 fixes to strftime.c for correct ISO 8601 week number generation,
3924 plus support for two new formats ('G' and 'g') to give ISO 8601 year
3925 numbers (which are not necessarily the same as calendar year numbers)
3928 Release code95i-data95m - 1995-12-21 12:46:47 -0500
3930 The latest revisions from Paul Eggert are included, the usno1995
3931 file has been updated, and a new file ("WWW") covering useful URLs
3935 Release code95h-data95l - 1995-12-19 18:10:12 -0500
3937 A simplification of a macro definition, a change to data for Sudan,
3938 and (for last minute shoppers) notes in the "Music" file on the CD
3942 Release code95g-data95k - 1995-10-30 10:32:47 -0500
3944 (slightly reformatted) 8-bit-clean proposed patch
3946 minor patch: US/Eastern -> America/New_York
3948 snapshot of the USNO's latest data ("usno1995")
3950 some other minor cleanups
3953 Release code95f-data95j - 1995-10-28 21:01:34 -0000
3954 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!]
3958 support for 64-bit time_t's
3960 optimization in localtime.c
3963 Release code95e - 1995-10-13 13:23:57 -0400
3965 the mktime change to scan from future to past when trying to find time zone
3969 Release data95i - 1995-09-26 10:43:26 -0400
3971 For Canada/Central, guess that the Sun customer's "one week too
3972 early" was just a approximation, and the true error is one month
3973 too early. This is consistent with the rest of Canada.
3976 Release data95h - 1995-09-21 11:26:48 -0400
3978 latest changes from Paul Eggert
3981 Release code95d - 1995-09-14 11:14:45 -0400
3983 the addition of a "Music" file, which documents four recorded
3984 versions of the tune "Save That Time".
3987 Release data95g - 1995-09-01 17:21:36 -0400
3989 "yearistype" correction
3992 Release data95f - 1995-08-28 20:46:56 -0400
3994 Paul Eggert's change to the australasia file
3997 Release data95e - 1995-07-08 18:02:34 -0400
3999 The only change is a leap second at the end of this year.
4000 Thanks to Bradley White for forwarding news on the leap second.
4003 Release data95d - 1995-07-03 13:26:22 -0400
4005 Paul Eggert's changes
4008 Release data95c - 1995-07-02 19:19:28 -0400
4010 changes to "asia", "backward", "europe", and "southamerica"
4011 (read: northamericacentrics need not apply)
4014 Release code95c - 1995-03-13 14:00:46 -0500
4016 one-line fix for sign extension problems in detzcode
4019 Release 95b - 1995-03-04 11:22:38 -0500
4021 Minor changes in both:
4023 The "code" file contains a workaround for the lack of "unistd.h" in
4024 Microsoft C++ version 7.
4026 The "data" file contains a fixed "Link" for America/Shiprock.
4029 Release 94h - 1994-12-10 12:51:14 -0500
4033 * incorporate the changes to "zdump" and "date" to make changes to
4034 the "TZ" environment variable permanent;
4036 * incorporate the table changes by Paul Eggert;
4038 * include (and document) support for universal time specifications in
4039 data files - but do not (yet) include use of this feature in the
4042 Think of this as "TZ Classic" - the software has been set up not to break if
4043 universal time shows up in its input, and data entries have been
4044 left as is so as not to break existing implementations.
4047 Release data94f - 1994-08-20 12:56:09 -0400
4049 (with thanks!) the latest data updates from Paul Eggert
4052 Release data94e - 1994-06-04 13:13:53 -0400
4057 Release code94g - 1994-05-05 12:14:07 -0400
4059 fix missing "optind.c" and a reference to it in the Makefile
4062 Release code94f - 1994-05-05 13:00:33 -0000
4063 [tzcode94f.tar.gz is missing!]
4065 changes to avoid overflow in difftime, as well as changes to cope
4066 with the 52/53 challenge in strftime
4069 Release code94e - 1994-03-30 23:32:59 -0500
4071 change for the benefit of PCTS
4074 Release 94d - 1994-02-24 15:42:25 -0500
4076 Avoid clashes with POSIX semantics for zones such as GMT+4.
4078 Some other very minor housekeeping is also present.
4081 Release code94c - 1994-02-10 08:52:40 -0500
4083 Fix bug where mkdirs was broken unless you compile with
4084 -fwritable-strings (which is generally losing to do).
4087 Release 94b - 1994-02-07 10:04:33 -0500
4089 work by Paul Eggert who notes:
4091 I found another book of time zone histories by E W Whitman; it's not
4092 as extensive as Shanks but has a few goodies of its own. I used it
4093 to update the tables. I also fixed some more as a result of
4094 correspondence with Adam David and Peter Ilieve, and move some stray
4095 links from 'europe' to 'backward'. I corrected some scanning errors
4098 As far as the code goes, I fixed zic to allow years in the range
4099 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900.
4100 And I cleaned up the zic documentation a little bit.
4103 Release data94a - 1994-02-03 08:58:54 -0500
4105 It simply incorporates the recently announced leap second into the
4109 Release 93g - 1993-11-22 17:28:27 -0500
4111 Paul Eggert has provided a good deal of historic information (based
4112 on Shanks), and there are some code changes to deal with the buglets
4113 that crawled out in dealing with the new information.
4116 Release 93f - 1993-10-15 12:27:46 -0400
4118 Paul Eggert's changes
4121 Release 93e - 1993-09-05 21:21:44 -0400
4123 This has updated data for Israel, England, and Kwajalein. There's
4124 also an update to "zdump" to cope with Kwajalein's 24-hour jump.
4125 Thanks to Paul Eggert and Peter Ilieve for the changes.
4128 Release 93d - 1993-06-17 23:34:17 -0400
4130 new fix and new data on Israel
4133 Release 93c - 1993-06-06 19:31:55 -0400
4138 Release 93b - 1993-02-02 14:53:58 -0500
4140 updated "leapseconds" file
4143 Release 93 - 1993-01-08 07:01:06 -0500
4145 At kre's suggestion, the package has been split in two - a code piece
4146 (which also includes documentation) that's only of use to folks who
4147 want to recompile things and a data piece useful to anyone who can
4150 The new version has a few changes to the data files, a few
4151 portability changes, and an off-by-one fix (with thanks to
4152 Tom Karzes at deshaw.com for providing a description and a
4156 Release 92c - 1992-11-21 17:35:36 -0000
4157 [tz92c.tar.Z is missing!]
4159 The fallout from the latest round of DST transitions.
4161 There are changes for Portugal, Saskatchewan, and "Pacific-New";
4162 there's also a change to "zic.c" that makes it portable to more systems.
4165 Release 92 - 1992-04-25 18:17:03 -0000
4166 [tz92.tar.Z is missing!]
4168 By popular demand (well, at any rate, following a request by kre at munnari)
4171 The 1989 update of the time zone package featured:
4173 * POSIXization (including interpretation of POSIX-style TZ environment
4174 variables, provided by Guy Harris),
4175 * ANSIfication (including versions of "mktime" and "difftime"),
4176 * SVIDulation (an "altzone" variable)
4177 * MACHination (the "gtime" function)
4178 * corrections to some time zone data (including corrections to the rules
4179 for Great Britain and New Zealand)
4180 * reference data from the United States Naval Observatory for folks who
4181 want to do additional time zones
4182 * and the 1989 data for Saudi Arabia.
4184 (Since this code will be treated as "part of the implementation" in some
4185 places and as "part of the application" in others, there's no good way to
4186 name functions, such as timegm, that are not part of the proposed ANSI C
4187 standard; such functions have kept their old, underscore-free names in this
4190 And the "dysize" function has disappeared; it was present to allow
4191 compilation of the "date" command on old BSD systems, and a version of "date"
4192 is now provided in the package. The "date" command is not created when you
4193 "make all" since it may lack options provided by the version distributed with
4194 your operating system, or may not interact with the system in the same way
4195 the native version does.
4197 Since POSIX frowns on correct leap second handling, the default behavior of
4198 the "zic" command (in the absence of a "-L" option) has been changed to omit
4199 leap second information from its output files.
4205 This file contains copies of the part of each release announcement
4206 that talks about the changes in that release. The text has been
4207 adapted and reformatted for the purposes of this file.
4209 Traditionally a release R consists of a pair of tarball files,
4210 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g.,
4211 code2010a, data2012c) consist of just one or the other tarball, and a
4212 few (e.g., code2012c-data2012d) have tarballs with mixed version
4213 numbers. Recent releases also come in an experimental format
4214 consisting of a single tarball tzdb-R.tar.lz with extra data.
4216 Release timestamps are taken from the release's commit (for newer,
4217 Git-based releases), from the newest file in the tarball (for older
4218 releases, where this info is available) or from the email announcing
4219 the release (if all else fails; these are marked with a time zone of
4220 -0000 and an "is missing!" comment).
4222 Earlier versions of the code and data were not announced on the tz
4223 list and are not summarized here.
4225 This file is in the public domain.