1 News for the tz database
3 Release 2018e - 2018-05-01 23:42:51 -0700
7 North Korea switches back to +09 on 2018-05-05.
8 The main format uses negative DST again, for Ireland etc.
9 'make tarballs' now also builds a rearguard tarball.
10 New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines.
12 Changes to past and future time stamps
14 North Korea switches back from +0830 to +09 on 2018-05-05.
15 (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon,
18 Bring back the negative-DST changes of 2018a, except be more
19 compatible with data parsers that do not support negative DST.
20 Also, this now affects historical time stamps in Namibia and the
21 former Czechoslovakia, not just Ireland. The main format now uses
22 negative DST to model time stamps in Europe/Dublin (from 1971 on),
23 Europe/Prague (1946/7), and Africa/Windhoek (1994/2017). This
24 does not affect UT offsets, only time zone abbreviations and the
25 tm_isdst flag. Also, this does not affect rearguard or vanguard
26 formats; effectively the main format now uses vanguard instead of
27 rearguard format. Data parsers that do not support negative DST
28 can still use data from the rearguard tarball described below.
30 Changes to build procedure
32 The command 'make tarballs' now also builds the tarball
33 tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz
34 except that it uses rearguard format intended for trailing-edge
37 Changes to data format and to code
39 The SAVE column of Rule and Zone lines can now have an 's' or 'd'
40 suffix, which specifies whether the adjusted time is standard time
41 or daylight saving time. If no suffix is given, daylight saving
42 time is used if and only if the SAVE column is nonzero; this is
43 the longstanding behavior. Although this new feature is not used
44 in tzdata, it could be used to specify the legal time in Namibia
45 1994-2017, as opposed to the popular time (see below).
47 Changes to past time stamps
49 From 1994 through 2017 Namibia observed DST in winter, not summer.
50 That is, it used negative DST, as Ireland still does. This change
51 does not affect UTC offsets; it affects only the tm_isdst flag and
52 the abbreviation used during summer, which is now CAT, not WAST.
53 Although (as noted by Michael Deckers) summer and winter time were
54 both simply called "standard time" in Namibian law, in common
55 practice winter time was considered to be DST (as noted by Stephen
56 Colebourne). The full effect of this change is only in vanguard
57 format; in rearguard and main format, the tm_isdst flag is still
58 zero in winter and nonzero in summer.
60 In 1946/7 Czechoslovakia also observed negative DST in winter.
61 The full effect of this change is only in vanguard format; in
62 rearguard and main formats, it is modeled as plain GMT without
63 daylight saving. Also, the dates of some 1944/5 DST transitions
64 in Czechoslovakia have been changed.
67 Release 2018d - 2018-03-22 07:05:46 -0700
71 Palestine starts DST a week earlier in 2018.
72 Add support for vanguard and rearguard data consumers.
73 Add subsecond precision to source data format, though not to data.
75 Changes to future time stamps
77 In 2018, Palestine starts DST on March 24, not March 31.
78 Adjust future predictions accordingly. (Thanks to Sharef Mustafa.)
80 Changes to past and future time stamps
82 Casey Station in Antarctica changed from +11 to +08 on 2018-03-11
83 at 04:00. (Thanks to Steffen Thorsen.)
85 Changes to past time stamps
87 Historical transitions for Uruguay, represented by
88 America/Montevideo, have been updated per official legal documents,
89 replacing previous data mainly originating from the inventions of
90 Shanks & Pottenger. This has resulted in adjustments ranging from
91 30 to 90 minutes in either direction over at least two dozen
92 distinct periods ranging from one day to several years in length.
93 A mere handful of pre-1991 transitions are unaffected; data since
94 then has come from more reliable contemporaneous reporting. These
95 changes affect various timestamps in 1920-1923, 1936, 1939,
96 1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990.
97 Additionally, Uruguay's pre-standard-time UT offset has been
98 adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to
99 match the location of the Observatory of the National Meteorological
100 Institute in Montevideo.
101 (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.)
103 Enderbury and Kiritimati skipped New Year's Eve 1994, not
104 New Year's Day 1995. (Thanks to Kerry Shetline.)
106 Fix the 1912-01-01 transition for Portugal and its colonies.
107 This transition was at 00:00 according to the new UT offset, not
108 according to the old one. Also assume that Cape Verde switched on
109 the same date as the rest, not in 1907. This affects
110 Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores,
111 Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon.
112 (Thanks to Michael Deckers.)
114 Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in
117 Changes to past time zone abbreviations
119 MMT took effect in Uruguay from 1908-06-10, not 1898-06-28. There
120 is no clock change associated with the transition.
122 Changes to build procedure
124 The new DATAFORM macro in the Makefile lets the installer choose
125 among three source data formats. The idea is to lessen downstream
126 disruption when data formats are improved.
128 * DATAFORM=vanguard installs from the latest, bleeding-edge
129 format. DATAFORM=main (the default) installs from the format
130 used in the 'africa' etc. files. DATAFORM=rearguard installs
131 from a trailing-edge format. Eventually, elements of today's
132 vanguard format should move to the main format, and similarly
133 the main format's features should eventually move to the
136 * In the current version, the main and rearguard formats are
137 identical and match that of 2018c, so this change does not
138 affect default behavior. The vanguard format currently contains
139 one feature not in the main format: negative SAVE values. This
140 improves support for Ireland, which uses Irish Standard Time
141 (IST, UTC+01) in summer and GMT (UTC) in winter. tzcode has
142 supported negative SAVE values for decades, and this feature
143 should move to the main format soon. However, it will not move
144 to the rearguard format for quite some time because some
145 downstream parsers do not support it.
147 * The build procedure constructs three files vanguard.zi, main.zi,
148 and rearguard.zi, one for each format. The files represent the
149 same data as closely as the formats allow. These three files
150 are intended for downstream data consumers and are not
151 installed. Zoneinfo parsers that do not support negative SAVE values
152 should start using rearguard.zi, so that they will be unaffected
153 when the negative-DST feature moves from vanguard to main.
154 Bleeding-edge Zoneinfo parsers that support the new features
155 already can use vanguard.zi; in this respect, current tzcode is
158 The Makefile should now be safe for parallelized builds, and 'make
159 -j to2050new.tzs' is now much faster on a multiprocessor host
162 When built with -DSUPPRESS_TZDIR, the tzcode library no longer
163 prepends TZDIR/ to file names that do not begin with '/'. This is
164 not recommended for general use, due to its security implications.
165 (From a suggestion by Manuela Friedrich.)
169 zic now accepts subsecond precision in expressions like
170 00:19:32.13, which is approximately the legal time of the
171 Netherlands from 1835 to 1937. However, because it is
172 questionable whether the few recorded uses of non-integer offsets
173 had subsecond precision in practice, there are no plans for tzdata
174 to use this feature. (Thanks to Steve Allen for pointing out
175 the limitations of historical data in this area.)
177 The code is a bit more portable to MS-Windows. Installers can
178 compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that
179 reserve identifiers like 'localtime'. (Thanks to Manuela
182 Changes to documentation and commentary
184 theory.html now outlines tzdb's extensions to POSIX's model for
185 civil time, and has a section "POSIX features no longer needed"
186 that lists POSIX API components that are now vestigial.
187 (From suggestions by Steve Summit.) It also better distinguishes
188 time zones from tz regions. (From a suggestion by Guy Harris.)
190 Commentary is now more consistent about using the phrase "daylight
191 saving time", to match the C name tm_isdst. Daylight saving time
192 need not occur in summer, and need not have a positive offset from
195 Commentary about historical transitions in Uruguay has been expanded
196 with links to many relevant legal documents.
197 (Thanks to Tim Parenti.)
199 Commentary now uses some non-ASCII characters with Unicode value
200 less than U+0100, as they can be useful and should work even with
201 older editors such as XEmacs.
204 Release 2018c - 2018-01-22 23:00:44 -0800
207 Revert Irish changes that relied on negative SAVE values.
211 Revert the 2018a change to Europe/Dublin. As before, this change
212 does not affect UT offsets or abbreviations; it affects only
213 whether timestamps are considered to be standard time or
214 daylight-saving time, as expressed in the tm_isdst flag of C's
215 struct tm type. This reversion is intended to be a temporary
216 workaround for problems discovered with downstream uses of
217 releases 2018a and 2018b, which implemented Irish time by using
218 negative SAVE values in the Eire rules of the 'europe' file.
219 Although negative SAVE values have been part of tzcode for many
220 years and are supported by many platforms, they were not
221 documented before 2018a and ICU and OpenJDK do not currently
222 support them. A mechanism to export data to platforms lacking
223 support for negative DST is planned to be developed before the
224 change is reapplied. (Problems reported by Deborah Goldsmith and
227 Changes to past time stamps
229 Japanese DST transitions (1948-1951) were Sundays at 00:00, not
230 Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.)
232 Changes to build procedure
234 The build procedure now works around mawk 1.3.3's lack of support
235 for character class expressions. (Problem reported by Ohyama.)
238 Release 2018b - 2018-01-17 23:24:48 -0800
241 Fix a packaging problem in tz2018a, which was missing 'pacificnew'.
243 Changes to build procedure
245 The distribution now contains the file 'pacificnew' again.
246 This file was inadvertantly omitted in the 2018a distribution.
247 (Problem reported by Matias Fonzo.)
250 Release 2018a - 2018-01-12 22:29:21 -0800
253 São Tomé and Príncipe switched from +00 to +01.
254 Brazil's DST will now start on November's first Sunday.
255 Ireland's standard time is now in the summer, not the winter.
256 Use Debian-style installation locations, instead of 4.3BSD-style.
259 Changes to past and future time stamps
261 São Tomé and Príncipe switched from +00 to +01 on 2018-01-01 at
262 01:00. (Thanks to Steffen Thorsen and Michael Deckers.)
264 Changes to future time stamps
266 Starting in 2018 southern Brazil will begin DST on November's
267 first Sunday instead of October's third Sunday. (Thanks to
270 Changes to past time stamps
272 A discrepancy of 4 s in timestamps before 1931 in South Sudan has
273 been corrected. The 'backzone' and 'zone.tab' files did not agree
274 with the 'africa' and 'zone1970.tab' files. (Problem reported by
277 The abbreviation invented for Bolivia Summer Time (1931-2) is now
278 BST instead of BOST, to be more consistent with the convention
279 used for Latvian Summer Time (1918-9) and for British Summer Time.
283 Change Europe/Dublin so that it observes Irish Standard Time (UT
284 +01) in summer and GMT (as negative daylight-saving) in winter,
285 instead of observing standard time (GMT) in winter and Irish
286 Summer Time (UT +01) in summer. This change does not affect UT
287 offsets or abbreviations; it affects only whether timestamps are
288 considered to be standard time or daylight-saving time, as
289 expressed in the tm_isdst flag of C's struct tm type.
290 (Discrepancy noted by Derick Rethans.)
292 Changes to build procedure
294 The default installation locations have been changed to mostly
295 match Debian circa 2017, instead of being designed as an add-on to
296 4.3BSD circa 1986. This affects the Makefile macros TOPDIR,
297 TZDIR, MANDIR, and LIBDIR. New Makefile macros TZDEFAULT, USRDIR,
298 USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor
299 locations more precisely. (This responds to suggestions from
300 Brian Inglis and from Steve Summit.)
302 The default installation procedure no longer creates the
303 backward-compatibility link US/Pacific-New, which causes
304 confusion during user setup (e.g., see Debian bug 815200).
305 Use 'make BACKWARD="backward pacificnew"' to create the link
306 anyway, for now. Eventually we plan to remove the link entirely.
308 tzdata.zi now contains a version-number comment.
309 (Suggested by Tom Lane.)
311 The Makefile now quotes values like BACKWARD more carefully when
312 passing them to the shell. (Problem reported by Zefram.)
314 Builders no longer need to specify -DHAVE_SNPRINTF on platforms
315 that have snprintf and use pre-C99 compilers. (Problem reported
320 zic has a new option -t FILE that specifies the location of the
321 file that determines local time when TZ is unset. The default for
322 this location can be configured via the new TZDEFAULT makefile
323 macro, which defaults to /etc/localtime.
325 Diagnostics and commentary now distinguish UT from UTC more
326 carefully; see theory.html for more information about UT vs UTC.
328 zic has been ported to GCC 8's -Wstringop-truncation option.
329 (Problem reported by Martin Sebor.)
331 Changes to documentation and commentary
333 The zic man page now documents the longstanding behavior that
334 times and years can be out of the usual range, with negative times
335 counting backwards from midnight and with year 0 preceding year 1.
336 (Problem reported by Michael Deckers.)
338 The theory.html file now mentions the POSIX limit of six chars
339 per abbreviation, and lists alphabetic abbreviations used.
341 The files tz-art.htm and tz-link.htm have been renamed to
342 tz-art.html and tz-link.html, respectively, for consistency with
343 other file names and to simplify web server configuration.
346 Release 2017c - 2017-10-20 14:49:34 -0700
349 Northern Cyprus switches from +03 to +02/+03 on 2017-10-29.
350 Fiji ends DST 2018-01-14, not 2018-01-21.
351 Namibia switches from +01/+02 to +02 on 2018-04-01.
352 Sudan switches from +03 to +02 on 2017-11-01.
353 Tonga likely switches from +13/+14 to +13 on 2017-11-05.
354 Turks & Caicos switches from -04 to -05/-04 on 2018-11-04.
355 A new file tzdata.zi now holds a small text copy of all data.
356 The zic input format has been regularized slightly.
358 Changes to future time stamps
360 Northern Cyprus has decided to resume EU rules starting
361 2017-10-29, thus reinstituting winter time.
363 Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously
364 predicted. (Thanks to Dominic Fok.) Adjust future predictions
367 Namibia will switch from +01 with DST to +02 all year on
368 2017-09-03 at 02:00. This affects UT offsets starting 2018-04-01
369 at 02:00. (Thanks to Steffen Thorsen.)
371 Sudan will switch from +03 to +02 on 2017-11-01. (Thanks to Ahmed
372 Atyya and Yahia Abdalla.) South Sudan is not switching, so
373 Africa/Juba is no longer a link to Africa/Khartoum.
375 Tonga has likely ended its experiment with DST, and will not
376 adjust its clocks on 2017-11-05. Although Tonga has not announced
377 whether it will continue to observe DST, the IATA is assuming that
378 it will not. (Thanks to David Wade.)
380 Turks & Caicos will switch from -04 all year to -05 with US DST on
381 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04
382 at 02:00. (Thanks to Steffen Thorsen.)
384 Changes to past time stamps
386 Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03.
387 (Thanks to Arthur David Olson.)
389 Detroit did not observe DST in 1967.
391 Use railway time for Asia/Kolkata before 1941, by switching to
392 Madras local time (UT +052110) in 1870, then to IST (UT +0530) in
393 1906. Also, treat 1941-2's +0630 as DST, like 1942-5.
395 Europe/Dublin's 1946 and 1947 fallback transitions occurred at
396 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.)
398 Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to
399 American time in 1892, not 1879. (Thanks to Michael Deckers.)
401 Adjust the 1867 transition in Alaska to better reflect the
402 historical record, by changing it to occur on 1867-10-18 at 15:30
403 Sitka time rather than at the start of 1867-10-17 local time.
404 Although strictly speaking this is accurate only for Sitka,
405 the rest of Alaska's blanks need to be filled in somehow.
407 Fix off-by-one errors in UT offsets for Adak and Nome before 1867.
408 (Thanks to Michael Deckers.)
410 Add 7 s to the UT offset in Asia/Yangon before 1920.
412 Changes to zone names
414 Remove Canada/East-Saskatchewan from the 'backward' file, as it
415 exceeded the 14-character limit and was an unused misnomer anyway.
417 Changes to build procedure
419 To support applications that prefer to read time zone data in text
420 form, two zic input files tzdata.zi and leapseconds are now
421 installed by default. The commands 'zic tzdata.zi' and 'zic -L
422 leapseconds tzdata.zi' can reproduce the tzdata binary files
423 without and with leap seconds, respectively. To prevent these two
424 new files from being installed, use 'make TZDATA_TEXT=', and to
425 suppress leap seconds from the tzdata text installation, use 'make
426 TZDATA_TEXT=tzdata.zi'.
428 'make BACKWARD=' now suppresses backward-compatibility names
429 like 'US/Pacific' that are defined in the 'backward' and
432 'make check' now works on systems that lack a UTF-8 locale,
433 or that lack the nsgmls program. Set UTF8_LOCALE to configure
434 the name of a UTF-8 locale, if you have one.
436 Y2K runtime checks are no longer enabled by default. Add
437 -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of
438 adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU
439 to disable them. (New name suggested by Brian Inglis.)
441 The build procedure for zdump now works on AIX 7.1.
442 (Problem reported by Kees Dekker.)
446 zic and the reference runtime now reject multiple leap seconds
447 within 28 days of each other, or leap seconds before the Epoch.
448 As a result, support for double leap seconds, which was
449 obsolescent and undocumented, has been removed. Double leap
450 seconds were an error in the C89 standard; they have never existed
451 in civil timekeeping. (Thanks to Robert Elz and Bradley White for
452 noticing glitches in the code that uncovered this problem.)
454 zic now warns about use of the obsolescent and undocumented -y
455 option, and about use of the obsolescent TYPE field of Rule lines.
457 zic now allows unambiguous abbreviations like "Sa" and "Su" for
458 weekdays; formerly it rejected them due to a bug. Conversely, zic
459 no longer considers non-prefixes to be abbreviations; for example,
460 it no longer accepts "lF" as an abbreviation for "lastFriday".
461 Also, zic warns about the undocumented usage with a "last-"
462 prefix, e.g., "last-Fri".
464 Similarly, zic now accepts the unambiguous abbreviation "L" for
465 "Link" in ordinary context and for "Leap" in leap-second context.
466 Conversely, zic no longer accepts non-prefixes such as "La" as
467 abbreviations for words like "Leap".
469 zic no longer accepts leap second lines in ordinary input, or
470 ordinary lines in leap second input. Formerly, zic sometimes
471 warned about this undocumented usage and handled it incorrectly.
473 The new macro HAVE_TZNAME governs whether the tzname external
474 variable is exported, instead of USG_COMPAT. USG_COMPAT now
475 governs only the external variables "timezone" and "daylight".
476 This change is needed because the three variables are not in the
477 same category: although POSIX requires tzname, it specifies the
478 other two variables as optional. Also, USG_COMPAT is now 1 or 0:
479 if not defined, the code attempts to guess it from other macros.
481 localtime.c and difftime.c no longer require stdio.h, and .c files
482 other than zic.c no longer require sys/wait.h.
484 zdump.c no longer assumes snprintf. (Reported by Jonathan Leffler.)
486 Calculation of time_t extrema works around a bug in GCC 4.8.4
487 (Reported by Stan Shebs and Joseph Myers.)
489 zic.c no longer mistranslates formats of line numbers in non-English
490 locales. (Problem reported by Benno Schulenberg.)
492 Several minor changes have been made to the code to make it a
493 bit easier to port to MS-Windows and Solaris. (Thanks to Kees
494 Dekker for reporting the problems.)
496 Changes to documentation and commentary
498 The two new files 'theory.html' and 'calendars' contain the
499 contents of the removed file 'Theory'. The goal is to document
500 tzdb theory more accessibly.
502 The zic man page now documents abbreviation rules.
504 tz-link.htm now covers how to apply tzdata changes to clients.
505 (Thanks to Jorge Fábregas for the AIX link.) It also mentions MySQL.
507 The leap-seconds.list URL has been updated to something that is
508 more reliable for tzdb. (Thanks to Tim Parenti and Brian Inglis.)
510 Release 2017b - 2017-03-17 07:30:38 -0700
512 Briefly: Haiti has resumed DST.
514 Changes to past and future time stamps
516 Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.)
518 Changes to past time stamps
520 Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01.
522 Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430"
523 is one byte over the POSIX limit. (Problem reported by Derick Rethans.)
527 The reference localtime implementation now falls back on the
528 current US daylight-saving transition rules rather than the
529 1987-2006 rules. This fallback occurs only when (1) the TZ
530 environment variable's value has a name like "AST4ADT" that asks
531 for daylight saving time but does not specify the rules, (2) there
532 is no file by that name, and (3) the TZDEFRULES file cannot be
533 loaded. (Thanks to Tom Lane.)
536 Release 2017a - 2017-02-28 00:05:36 -0800
538 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia
541 Changes to future time stamps
543 Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.)
545 Chile's Region of Magallanes moves from -04/-03 to -03 year-round.
546 Its clocks diverge from America/Santiago starting 2017-05-13 at
547 23:00, hiving off a new zone America/Punta_Arenas. Although the
548 Chilean government says this change expires in May 2019, for now
549 assume it's permanent. (Thanks to Juan Correa and Deborah
550 Goldsmith.) This also affects Antarctica/Palmer.
552 Changes to past time stamps
554 Fix many entries for historical time stamps for Europe/Madrid
555 before 1979, to agree with tables compiled by Pere Planesas of the
556 National Astronomical Observatory of Spain. As a side effect,
557 this changes some time stamps for Africa/Ceuta before 1929, which
558 are probably guesswork anyway. (Thanks to Steve Allen and
559 Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for
560 correcting the 1901 transition.)
562 Ecuador observed DST from 1992-11-28 to 1993-02-05.
563 (Thanks to Alois Treindl.)
565 Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21.
566 (Thanks to Stepan Golosunov.)
568 Changes to past and future time zone abbreviations
570 Switch to numeric time zone abbreviations for South America, as
571 part of the ongoing project of removing invented abbreviations.
572 This avoids the need to invent an abbreviation for the new Chilean
573 new zone. Similarly, switch from invented to numeric time zone
574 abbreviations for Afghanistan, American Samoa, the Azores,
575 Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei,
576 Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is,
577 Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland,
578 Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia,
579 the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia,
580 Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau,
581 Papua New Guinea, the Philippines, Pitcairn, Qatar, Réunion, St
582 Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore,
583 Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and
584 Xinjiang; for 20-minute daylight saving time in Ghana before 1943;
585 for half-hour daylight saving time in Belize before 1944 and in
586 the Dominican Republic before 1975; and for Canary Islands before
587 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for
588 Indian Summer Time before 1942, for Indonesia before around 1964,
589 for Kenya before 1960, for Liberia before 1973, for Madeira before
590 1967, for Namibia before 1943, for the Netherlands in 1937-9, for
591 Pakistan before 1971, for Western Sahara before 1977, and for
592 Zaporozhye in 1880-1924.
594 For Alaska time from 1900 through 1967, instead of "CAT" use the
595 abbreviation "AST", the abbreviation commonly used at the time
596 (Atlantic Standard Time had not been standardized yet). Use "AWT"
597 and "APT" instead of the invented abbreviations "CAWT" and "CAPT".
599 Use "CST" and "CDT" instead of invented abbreviations for Macau
600 before 1999 and Taiwan before 1938, and use "JST" instead of the
601 invented abbreviation "JCST" for Japan and Korea before 1938.
603 Change to database entry category
605 Move the Pacific/Johnston link from 'australasia' to 'backward',
606 since Johnston is now uninhabited.
610 zic no longer mishandles some transitions in January 2038 when it
611 attempts to work around Qt bug 53071. This fixes a bug affecting
612 Pacific/Tongatapu that was introduced in zic 2016e. localtime.c
613 now contains a workaround, useful when loading a file generated by
614 a buggy zic. (Problem and localtime.c fix reported by Bradley
617 zdump -i now outputs non-hour numeric time zone abbreviations
618 without a colon, e.g., "+0530" rather than "+05:30". This agrees
619 with zic %z and with common practice, and simplifies auditing of
622 zdump is now buildable again with -DUSE_LTZ=0.
623 (Problem reported by Joseph Myers.)
625 zdump.c now always includes private.h, to avoid code duplication
626 with private.h. (Problem reported by Kees Dekker.)
628 localtime.c no longer mishandles early or late timestamps
629 when TZ is set to a POSIX-style string that specifies DST.
630 (Problem reported by Kees Dekker.)
632 date and strftime now cause %z to generate "-0000" instead of
633 "+0000" when the UT offset is zero and the time zone abbreviation
636 Changes to documentation and commentary
638 The 'Theory' file now better documents choice of historical time
639 zone abbreviations. (Problems reported by Michael Deckers.)
641 tz-link.htm now covers leap smearing, which is popular in clouds.
644 Release 2016j - 2016-11-22 23:17:13 -0800
646 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04.
648 Changes to future time stamps
650 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00.
651 This hives off a new zone Europe/Saratov from Europe/Volgograd.
652 (Thanks to Yuri Konotopov and Stepan Golosunov.)
654 Changes to past time stamps
656 The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like
657 Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring
658 1999, not fall 1994. (Thanks to Stepan Golosunov.)
660 Changes to past time zone abbreviations
662 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote
663 summer time before 1948. The old use of "EET" was a typo.
667 zic no longer mishandles file systems that lack hard links, fixing
668 bugs introduced in 2016g. (Problems reported by Tom Lane.)
669 Also, when the destination already contains symbolic links, zic
670 should now work better on systems where the 'link' system call
671 does not follow symbolic links.
673 Changes to documentation and commentary
675 tz-link.htm now documents the relationship between release version
676 numbers and development-repository commit tags. (Suggested by
679 The 'Theory' file now documents UT.
681 iso3166.tab now accents "Curaçao", and commentary now mentions
682 the names "Cabo Verde" and "Czechia". (Thanks to Jiří Boháč.)
685 Release 2016i - 2016-11-01 23:19:52 -0700
687 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga
688 reintroduces DST on 2016-11-06.
690 Changes to future time stamps
692 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on
693 2017-01-15 at 03:00. Assume future observances in Tonga will be
694 from the first Sunday in November through the third Sunday in
695 January, like Fiji. (Thanks to Pulu ʻAnau.) Switch to numeric
696 time zone abbreviations for this zone.
698 Changes to past and future time stamps
700 Northern Cyprus is now +03 year round, causing a split in Cyprus
701 time zones starting 2016-10-30 at 04:00. This creates a zone
702 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.)
704 Antarctica/Casey switched from +08 to +11 on 2016-10-22.
705 (Thanks to Steffen Thorsen.)
707 Changes to past time stamps
709 Several corrections were made for pre-1975 time stamps in Italy.
710 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and
713 First, the 1893-11-01 00:00 transition in Italy used the new UT
714 offset (+01), not the old (+00:49:56). (Thanks to Michael
717 Second, rules for daylight saving in Italy were changed to agree
718 with Italy's National Institute of Metrological Research (INRiM)
719 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian
720 Inglis, and Michael Deckers):
722 The 1916-06-03 transition was at 24:00, not 00:00.
724 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at
727 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not
730 The 1944-09-17 transition was at 03:00, not 01:00. This
731 particular change is taken from Italian law as INRiM's table,
732 (which says 02:00) appears to have a typo here. Also, keep the
733 1944-04-03 transition for Europe/Rome, as Rome was controlled by
736 The 1967-1970 and 1972-1974 fallback transitions were at 01:00,
741 The code should now be buildable on AmigaOS merely by setting the
742 appropriate Makefile variables. (From a patch by Carsten Larsen.)
745 Release 2016h - 2016-10-19 23:17:57 -0700
747 Changes to future time stamps
749 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not
750 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that
751 future fall transitions will be on the last Saturday of October
752 at 01:00, which is consistent with predicted spring transitions
753 on the last Saturday of March. (Thanks to Tim Parenti.)
755 Changes to past time stamps
757 In Turkey, transitions in 1986-1990 were at 01:00 standard time
758 not at 02:00, and the spring 1994 transition was on March 20, not
759 March 27. (Thanks to Kıvanç Yazan.)
761 Changes to past and future time zone abbreviations
763 Asia/Colombo now uses numeric time zone abbreviations like "+0530"
764 instead of alphabetic ones like "IST" and "LKT". Various
765 English-language sources use "IST", "LKT" and "SLST", with no
766 working consensus. (Usage of "SLST" mentioned by Sadika
771 zic no longer mishandles relativizing file names when creating
772 symbolic links like /etc/localtime, when these symbolic links
773 are outside the usual directory hierarchy. This fixes a bug
774 introduced in 2016g. (Problem reported by Andreas Stieger.)
776 Changes to build procedure
778 New rules 'traditional_tarballs' and 'traditional_signatures' for
779 building just the traditional-format distribution. (Requested by
782 The file 'version' is now put into the tzdata tarball too.
783 (Requested by Howard Hinnant.)
785 Changes to documentation and commentary
787 The 'Theory' file now has a section on interface stability.
788 (Requested by Paul Koning.) It also mentions features like
789 tm_zone and localtime_rz that have long been supported by the
792 tz-link.htm has improved coverage of time zone boundaries suitable
793 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt
796 The US commentary now mentions Allen and the "day of two noons".
798 The Fiji commentary mentions the government's 2016-10-03 press
799 release. (Thanks to Raymond Kumar.)
802 Release 2016g - 2016-09-13 08:56:38 -0700
804 Changes to future time stamps
806 Turkey switched from EET/EEST (+02/+03) to permanent +03,
807 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather
808 than an invented abbreviation for the new time.
810 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52.
811 (Thanks to Tim Parenti.)
813 Changes to past time stamps
815 For America/Los_Angeles, spring-forward transition times have been
816 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in
819 For zones using Soviet time on 1919-07-01, transitions to UT-based
820 time were at 00:00 UT, not at 02:00 local time. The affected
821 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and
822 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.)
824 Changes to past and future time zone abbreviations
826 The Factory zone now uses the time zone abbreviation -00 instead
827 of a long English-language string, as -00 is now the normal way to
828 represent an undefined time zone.
830 Several zones in Antarctica and the former Soviet Union, along
831 with zones intended for ships at sea that cannot use POSIX TZ
832 strings, now use numeric time zone abbreviations instead of
833 invented or obsolete alphanumeric abbreviations. The affected
834 zones are Antarctica/Casey, Antarctica/Davis,
835 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera,
836 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok,
837 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita,
838 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga,
839 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin,
840 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi,
841 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg,
842 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11,
843 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5,
844 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2,
845 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8,
846 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad,
847 Europe/Minsk, Europe/Samara, Europe/Volgograd, and
848 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM
849 was replaced by +05, whereas MSK and MSD were kept as they are not
850 our invention and are widely used.
852 Changes to zone names
854 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link.
855 (Thanks to David Massoud.)
859 zic no longer generates binary files containing POSIX TZ-like
860 strings that disagree with the local time type after the last
861 explicit transition in the data. This fixes a bug with
862 Africa/Casablanca and Africa/El_Aaiun in some year-2037 time
863 stamps on the reference platform. (Thanks to Alexander Belopolsky
864 for reporting the bug and suggesting a way forward.)
866 If the installed localtime and/or posixrules files are symbolic
867 links, zic now keeps them symbolic links when updating them, for
868 compatibility with platforms like OpenSUSE where other programs
869 configure these files as symlinks.
871 zic now avoids hard linking to symbolic links, avoids some
872 unnecessary mkdir and stat system calls, and uses shorter file
875 zdump has a new -i option to generate transitions in a
876 more-compact but still human-readable format. This option is
877 experimental, and the output format may change in future versions.
878 (Thanks to Jon Skeet for suggesting that an option was needed,
879 and thanks to Tim Parenti and Chris Rovick for further comments.)
881 Changes to build procedure
883 An experimental distribution format is available, in addition
884 to the traditional format which will continue to be distributed.
885 The new format is a tarball tzdb-VERSION.tar.lz with signature
886 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory
887 tzdb-VERSION containing the code and data of the traditional
888 two-tarball format, along with extra data that may be useful.
889 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others
890 for comments about the experimental format.)
892 The release version number is now more accurate in the usual case
893 where releases are built from a Git repository. For example, if
894 23 commits and some working-file changes have been made since
895 release 2016g, the version number is now something like
896 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'.
897 Tagged releases use the same version number format as before,
898 e.g., '2016g'. To support the more-accurate version number, its
899 specification has moved from a line in the Makefile to a new
900 source file 'version'.
902 The experimental distribution contains a file to2050.tzs that
903 contains what should be the output of 'zdump -i -c 2050' on
904 primary zones. If this file is available, 'make check' now checks
905 that zdump generates this output.
907 'make check_web' now works on Fedora-like distributions.
909 Changes to documentation and commentary
911 tzfile.5 now documents the new restriction on POSIX TZ-like
912 strings that is now implemented by zic.
914 Comments now cite URLs for some 1917-1921 Russian DST decrees.
915 (Thanks to Alexander Belopolsky.)
917 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J
918 (thanks to Meno Hochschild) and ThreeTen-Extra, and its
919 description of Java 8 has been brought up to date (thanks to
920 Stephen Colebourne). Its description of local time on Mars has
921 been updated to match current practice, and URLs have been updated
922 and some obsolete ones removed.
925 Release 2016f - 2016-07-05 16:26:51 +0200
927 Changes affecting future time stamps
929 The Egyptian government changed its mind on short notice, and
930 Africa/Cairo will not introduce DST starting 2016-07-07 after all.
931 (Thanks to Mina Samuel.)
933 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00.
934 (Thanks to Stepan Golosunov.)
936 Changes to past and future time stamps
938 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone
939 abbreviations instead of invented ones.
941 Changes affecting past time stamps
943 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00.
944 (Thanks to Stepan Golosunov.)
947 Release 2016e - 2016-06-14 08:46:16 -0700
949 Changes affecting future time stamps
951 Africa/Cairo observes DST in 2016 from July 7 to the end of October.
952 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.)
953 For future years, guess April's last Thursday to October's last
954 Thursday except for Ramadan.
956 Changes affecting past time stamps
958 Locations while uninhabited now use '-00', not 'zzz', as a
959 placeholder time zone abbreviation. This is inspired by Internet
960 RFC 3339 and is more consistent with numeric time zone
961 abbreviations already used elsewhere. The change affects several
962 arctic and antarctic locations, e.g., America/Cambridge_Bay before
963 1920 and Antarctica/Troll before 2005.
965 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was
966 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.)
970 zic now outputs a dummy transition at time 2**31 - 1 in zones
971 whose POSIX-style TZ strings contain a '<'. This mostly works
972 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>.
973 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.)
975 Changes affecting documentation and commentary
977 tz-link.htm says why governments should give plenty of notice for
978 time zone or DST changes, and refers to Matt Johnson's blog post.
980 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.)
983 Release 2016d - 2016-04-17 22:50:29 -0700
985 Changes affecting future time stamps
987 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30.
988 (Thanks to Alexander Krivenyshev for the heads-up.)
990 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00.
991 (Thanks to Alexander Krivenyshev and Matt Johnson.)
993 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers
994 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29
995 at 02:00. (Thanks to Stepan Golosunov.)
997 Changes affecting past time stamps
999 New zone Europe/Kirov, split off from Europe/Volgograd. It covers
1000 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on
1001 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made
1002 the same change. (Thanks to Stepan Golosunov.)
1004 Russia and nearby locations had daylight-saving transitions on
1005 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on
1006 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan
1009 Many corrections to historical time in Kazakhstan from 1991
1010 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's
1011 invented time zone abbreviations with numeric abbreviations.
1013 Changes to commentary
1015 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references).
1018 Release 2016c - 2016-03-23 00:51:27 -0700
1020 Changes affecting future time stamps
1022 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.)
1024 Chile reverts from permanent to seasonal DST. (Thanks to Juan
1025 Correa for the heads-up, and to Tim Parenti for corrections.)
1026 Guess that future transitions are August's and May's second
1027 Saturdays at 24:00 mainland time. Also, call the period from
1028 2014-09-07 through 2016-05-14 daylight saving time instead of
1029 standard time, as that seems more appropriate now.
1031 Changes affecting past time stamps
1033 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to
1034 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed
1035 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26.
1036 (Thanks to Stepan Golosunov.)
1038 Changes to commentary
1040 Several updates and URLs for historical and proposed Russian changes.
1041 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.)
1044 Release 2016b - 2016-03-12 17:30:14 -0800
1048 Starting with release 2016b, some data entries cause zic implementations
1049 derived from tz releases 2005j through 2015e to issue warnings like
1050 "time zone abbreviation differs from POSIX standard (+03)".
1051 These warnings should not otherwise affect zic's output and can safely be
1052 ignored on today's platforms, as the warnings refer to a restriction in
1053 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the
1054 warnings is to upgrade to zic derived from tz releases 2015f and later.
1056 Changes affecting future time stamps
1058 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and
1059 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on
1060 2016-03-27 at 02:00 local time. They need distinct zones since their
1061 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and
1062 Altai Republic, Russia, which will switch from +06 to +07 on the same date
1063 and local time. The Astrakhan change is already official; the others have
1064 passed the first reading in the State Duma and are extremely likely.
1065 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00.
1066 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson
1067 and Stepan Golosunov for followup.)
1069 As a trial of a new system that needs less information to be made up,
1070 the new zones use numeric time zone abbreviations like "+04"
1071 instead of invented abbreviations like "ASTT".
1073 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via
1076 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00.
1077 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last
1078 Saturday at 01:00, not March's last Friday at 24:00.
1080 Changes affecting past time stamps
1082 Europe/Chisinau observed DST during 1990, and switched from +04 to
1083 +03 at 1990-05-06 02:00, instead of switching from +03 to +02.
1084 (Thanks to Stepan Golosunov.)
1086 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not
1087 KUYT/KUYST. (Thanks to Stepan Golosunov.)
1091 tzselect's diagnostics and checking, and checktab.awk's checking,
1092 have been improved. (Thanks to J William Piggott.)
1094 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.)
1096 tzselect now tests Julian-date TZ settings more accurately.
1097 (Thanks to J William Piggott.)
1099 Changes to commentary
1101 Comments in zone tables have been improved. (Thanks to J William Piggott.)
1103 tzselect again limits its menu comments so that menus fit on a
1104 24×80 alphanumeric display.
1106 A new web page tz-how-to.html. (Thanks to Bill Seymour.)
1108 In the Theory file, the description of possible time zone abbreviations in
1109 tzdata has been cleaned up, as the old description was unclear and
1110 inconsistent. (Thanks to Alain Mouette for reporting the problem.)
1113 Release 2016a - 2016-01-26 23:28:02 -0800
1115 Changes affecting future time stamps
1117 America/Cayman will not observe daylight saving this year after all.
1118 Revert our guess that it would. (Thanks to Matt Johnson.)
1120 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00.
1121 (Thanks to Alexander Krivenyshev.)
1123 Asia/Tehran now has DST predictions for the year 2038 and later,
1124 to be March 21 00:00 to September 21 00:00. This is likely better
1125 than predicting no DST, albeit off by a day every now and then.
1127 Changes affecting past and future time stamps
1129 America/Metlakatla switched from PST all year to AKST/AKDT on
1130 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.)
1132 America/Santa_Isabel has been removed, and replaced with a
1133 backward compatibility link to America/Tijuana. Its contents were
1134 apparently based on a misreading of Mexican legislation.
1136 Changes affecting past time stamps
1138 Asia/Karachi's two transition times in 2002 were off by a minute.
1139 (Thanks to Matt Johnson.)
1141 Changes affecting build procedure
1143 An installer can now combine leap seconds with use of the backzone file,
1144 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'.
1145 The old 'make posix_packrat' rule is now marked as obsolescent.
1146 (Thanks to Ian Abbott for an initial implementation.)
1148 Changes affecting documentation and commentary
1150 A new file LICENSE makes it easier to see that the code and data
1151 are mostly public-domain. (Thanks to James Knight.) The three
1152 non-public-domain files now use the current (3-clause) BSD license
1153 instead of older versions of that license.
1155 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki),
1156 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section
1157 on editing tz source files (with a mention of Sublime zoneinfo,
1158 thanks to Gilmore Davidson).
1160 The Theory and asia files now mention the 2015 book "The Global
1161 Transformation of Time, 1870-1950", and cite a couple of reviews.
1163 The America/Chicago entry now documents the informal use of US
1164 central time in Fort Pierre, South Dakota. (Thanks to Rick
1165 McDermid, Matt Johnson, and Steve Jones.)
1168 Release 2015g - 2015-10-01 00:39:51 -0700
1170 Changes affecting future time stamps
1172 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25.
1175 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time.
1176 (Thanks to Alexander Krivenyshev.)
1178 Fiji's 2016 fall-back transition is scheduled for January 17, not 24.
1179 (Thanks to Ken Rylander.)
1181 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has
1182 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08.
1183 New zone America/Fort_Nelson. (Thanks to Matt Johnson.)
1185 Changes affecting past time stamps
1187 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00.
1189 Changes affecting code
1191 localtime no longer mishandles America/Anchorage after 2037.
1192 (Thanks to Bradley White for reporting the bug.)
1194 On hosts with signed 32-bit time_t, localtime no longer mishandles
1195 Pacific/Fiji after 2038-01-16 14:00 UTC.
1197 The localtime module allows the variables 'timezone', 'daylight',
1198 and 'altzone' to be in common storage shared with other modules,
1199 and declares them in case the system <time.h> does not.
1200 (Problems reported by Kees Dekker.)
1202 On platforms with tm_zone, strftime.c now assumes it is not NULL.
1203 This simplifies the code and is consistent with zdump.c.
1204 (Problem reported by Christos Zoulas.)
1206 Changes affecting documentation
1208 The tzfile man page now documents that transition times denote the
1209 starts (not the ends) of the corresponding time periods.
1210 (Ambiguity reported by Bill Seymour.)
1213 Release 2015f - 2015-08-10 18:06:56 -0700
1215 Changes affecting future time stamps
1217 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.)
1218 The abbreviation remains "KST". (Thanks to Robert Elz.)
1220 Uruguay no longer observes DST. (Thanks to Steffen Thorsen
1223 Changes affecting past and future time stamps
1225 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC.
1226 (Thanks to Roman Tudos.)
1228 Changes affecting data format and code
1230 zic's '-y YEARISTYPE' option is no longer documented. The TYPE
1231 field of a Rule line should now be '-'; the old values 'even',
1232 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented.
1233 Although the implementation has not changed, these features do not
1234 work in the default installation, they are not used in the data,
1235 and they are now considered obsolescent.
1237 zic now checks that two rules don't take effect at the same time.
1238 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on
1239 simultaneity are now documented.
1241 The two characters '%z' in a zone format now stand for the UT
1242 offset, e.g., '-07' for seven hours behind UT and '+0530' for
1243 five hours and thirty minutes ahead. This better supports time
1244 zone abbreviations conforming to POSIX.1-2001 and later.
1246 Changes affecting installed data files
1248 Comments for America/Halifax and America/Glace_Bay have been improved.
1249 (Thanks to Brian Inglis.)
1251 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol,
1252 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller
1253 installed data files for Europe/Simferopol and Europe/Tallinn.
1254 It does not affect timestamps. (Thanks to Howard Hinnant.)
1256 Changes affecting code
1258 zdump and zic no longer warn about valid time zone abbreviations
1261 Some Visual Studio 2013 warnings have been suppressed.
1262 (Thanks to Kees Dekker.)
1264 'date' no longer sets the time of day and its -a, -d, -n and -t
1265 options have been removed. Long obsolescent, the implementation
1266 of these features had porting problems. Builders no longer need
1267 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H.
1268 (Thanks to Kees Dekker for pointing out the problem.)
1270 Changes affecting documentation
1272 The Theory file mentions naming issues earlier, as these seem to be
1273 poorly publicized (thanks to Gilmore Davidson for reporting the problem).
1275 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant).
1277 Mention that Herbert Samuel introduced the term "Summer Time".
1280 Release 2015e - 2015-06-13 10:56:02 -0700
1282 Changes affecting future time stamps
1284 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00,
1285 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.)
1287 Assume Cayman Islands will observe DST starting next year, using US rules.
1288 Although it isn't guaranteed, it is the most likely.
1290 Changes affecting data format
1292 The file 'iso3166.tab' now uses UTF-8, so that its entries can better
1293 spell the names of Åland Islands, Côte d'Ivoire, and Réunion.
1295 Changes affecting code
1297 When displaying data, tzselect converts it to the current locale's
1298 encoding if the iconv command works. (Problem reported by random832.)
1300 tzselect no longer mishandles Dominica, fixing a bug introduced
1301 in Release 2014f. (Problem reported by Owen Leibman.)
1303 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\".
1304 This fixes a bug introduced in Release 2014f.
1305 (Problem reported by Leonardo Chiquitto.)
1308 Release 2015d - 2015-04-24 08:09:46 -0700
1310 Changes affecting future time stamps
1312 Egypt will not observe DST in 2015 and will consider canceling it
1313 permanently. For now, assume no DST indefinitely.
1314 (Thanks to Ahmed Nazmy and Tim Parenti.)
1316 Changes affecting past time stamps
1318 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not
1319 1966-07-01. Also, Yukon's time zone history is documented better.
1320 (Thanks to Brian Inglis and Dennis Ferguson.)
1322 Change affecting past and future time zone abbreviations
1324 The abbreviations for Hawaii-Aleutian standard and daylight times
1325 have been changed from HAST/HADT to HST/HDT, as per US Government
1326 Printing Office style. This affects only America/Adak since 1983,
1327 as America/Honolulu was already using the new style.
1329 Changes affecting code
1331 zic has some minor performance improvements.
1334 Release 2015c - 2015-04-11 08:55:55 -0700
1336 Changes affecting future time stamps
1338 Egypt's spring-forward transition is at 24:00 on April's last Thursday,
1339 not 00:00 on April's last Friday. 2015's transition will therefore be on
1340 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes
1341 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.)
1343 Changes affecting past time stamps
1345 The following changes affect some pre-1991 Chile-related time stamps
1346 in America/Santiago, Antarctica/Palmer, and Pacific/Easter.
1348 The 1910 transition was January 10, not January 1.
1350 The 1918 transition was September 10, not September 1.
1352 The UT -04 time observed from 1932 to 1942 is now considered to
1353 be standard time, not year-round DST.
1355 Santiago observed DST (UT -03) from 1946-07-15 through
1356 1946-08-31, then reverted to standard time, then switched to -05
1359 Assume transitions before 1968 were at 00:00, since we have no data
1362 The spring 1988 transition was 1988-10-09, not 1988-10-02.
1363 The fall 1990 transition was 1990-03-11, not 1990-03-18.
1365 Assume no UT offset change for Pacific/Easter on 1890-01-01,
1366 and omit all transitions on Pacific/Easter from 1942 through 1946
1367 since we have no data suggesting that they existed.
1369 One more zone has been turned into a link, as it differed
1370 from an existing zone only for older time stamps. As usual,
1371 this change affects UT offsets in pre-1970 time stamps only.
1372 The zone's old contents have been moved to the 'backzone' file.
1373 The affected zone is America/Montreal.
1375 Changes affecting commentary
1377 Mention the TZUpdater tool.
1379 Mention "The Time Now". (Thanks to Brandon Ramsey.)
1382 Release 2015b - 2015-03-19 23:28:11 -0700
1384 Changes affecting future time stamps
1386 Mongolia will start observing DST again this year, from the last
1387 Saturday in March at 02:00 to the last Saturday in September at 00:00.
1388 (Thanks to Ganbold Tsagaankhuu.)
1390 Palestine will start DST on March 28, not March 27. Also,
1391 correct the fall 2014 transition from September 26 to October 24.
1392 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.)
1394 Changes affecting past time stamps
1396 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a
1397 regression. (Thanks to Stuart Bishop for reporting the problem.)
1399 Some more zones have been turned into links, when they differed
1400 from existing zones only for older time stamps. As usual,
1401 these changes affect UT offsets in pre-1970 time stamps only.
1402 Their old contents have been moved to the 'backzone' file.
1403 The affected zones are: America/Antigua, America/Cayman,
1404 Pacific/Midway, and Pacific/Saipan.
1406 Changes affecting time zone abbreviations
1408 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD".
1411 Changes affecting code
1413 Fix integer overflow bug in reference 'mktime' implementation.
1414 (Problem reported by Jörg Richter.)
1416 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries
1417 to be used in the same executable as standard-library time_t functions.
1418 (Problems reported by Bradley White.)
1420 Changes affecting commentary
1422 Cite the recent Mexican decree changing Quintana Roo's time zone.
1423 (Thanks to Carlos Raúl Perasso.)
1425 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.)
1427 Update info about Mars time.
1430 Release 2015a - 2015-01-29 22:35:20 -0800
1432 Changes affecting future time stamps
1434 The Mexican state of Quintana Roo, represented by America/Cancun,
1435 will shift from Central Time with DST to Eastern Time without DST
1436 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.)
1438 Chile will not change clocks in April or thereafter; its new standard time
1439 will be its old daylight saving time. This affects America/Santiago,
1440 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.)
1442 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49.
1443 (Thanks to Tim Parenti.)
1445 Changes affecting past time stamps
1447 Iceland observed DST in 1919 and 1921, and its 1939 fallback
1448 transition was Oct. 29, not Nov. 29. Remove incorrect data from
1449 Shanks about time in Iceland between 1837 and 1908.
1451 Some more zones have been turned into links, when they differed
1452 from existing zones only for older time stamps. As usual,
1453 these changes affect UT offsets in pre-1970 time stamps only.
1454 Their old contents have been moved to the 'backzone' file.
1455 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait,
1458 Changes affecting code
1460 tzalloc now scrubs time zone abbreviations compatibly with the way
1461 that tzset always has, by replacing invalid bytes with '_' and by
1462 shortening too-long abbreviations.
1464 tzselect ports to POSIX awk implementations, no longer mishandles
1465 POSIX TZ settings when GNU awk is used, and reports POSIX TZ
1466 settings to the user. (Thanks to Stefan Kuhn.)
1468 Changes affecting build procedure
1470 'make check' now checks for links to links in the data.
1471 One such link (for Africa/Asmera) has been fixed.
1472 (Thanks to Stephen Colebourne for pointing out the problem.)
1474 Changes affecting commentary
1476 The leapseconds file commentary now mentions the expiration date.
1477 (Problem reported by Martin Burnicki.)
1479 Update Mexican Library of Congress URL.
1482 Release 2014j - 2014-11-10 17:37:11 -0800
1484 Changes affecting current and future time stamps
1486 Turks & Caicos' switch from US eastern time to UT -04 year-round
1487 did not occur on 2014-11-02 at 02:00. It's currently scheduled
1488 for 2015-11-01 at 02:00. (Thanks to Chris Walton.)
1490 Changes affecting past time stamps
1492 Many pre-1989 time stamps have been corrected for Asia/Seoul and
1493 Asia/Pyongyang, based on sources for the Korean-language Wikipedia
1494 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no
1495 longer guess that Pyongyang mimicked Seoul time after World War II,
1496 as this is politically implausible.
1498 Some more zones have been turned into links, when they differed
1499 from existing zones only for older time stamps. As usual,
1500 these changes affect UT offsets in pre-1970 time stamps only.
1501 Their old contents have been moved to the 'backzone' file.
1502 The affected zones are: Africa/Addis_Ababa, Africa/Asmara,
1503 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala,
1504 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and
1507 Changes affecting commentary
1509 The commentary is less enthusiastic about Shanks as a source,
1510 and is more careful to distinguish UT from UTC.
1513 Release 2014i - 2014-10-21 22:04:57 -0700
1515 Changes affecting future time stamps
1517 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00.
1518 (Thanks to Ken Rylander for the heads-up.) Guess that future
1519 years will use a similar pattern.
1521 A new Zone Pacific/Bougainville, for the part of Papua New Guinea
1522 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00.
1523 (Thanks to Kiley Walbom for the heads-up.)
1525 Changes affecting time zone abbreviations
1527 Since Belarus is not changing its clocks even though Moscow is,
1528 the time zone abbreviation in Europe/Minsk is changing from FET
1529 to its more-traditional value MSK on 2014-10-26 at 01:00.
1530 (Thanks to Alexander Bokovoy for the heads-up about Belarus.)
1532 The new abbreviation IDT stands for the pre-1976 use of UT +08 in
1533 Indochina, to distinguish it better from ICT (+07).
1535 Changes affecting past time stamps
1537 Many time stamps have been corrected for Asia/Ho_Chi_Minh before 1976
1538 (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's
1539 authoritative book). Asia/Ho_Chi_Minh has been added to
1540 zone1970.tab, to give tzselect users in Vietnam two choices,
1541 since north and south Vietnam disagreed after our 1970 cutoff.
1543 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as
1544 they differed from existing zones only for older time stamps. As
1545 usual, these changes affect pre-1970 time stamps only. Their old
1546 contents have been moved to the 'backzone' file.
1548 Changes affecting code
1550 The time-related library functions now set errno on failure, and
1551 some crashes in the new tzalloc-related library functions have
1552 been fixed. (Thanks to Christos Zoulas for reporting most of
1553 these problems and for suggesting fixes.)
1555 If USG_COMPAT is defined and the requested timestamp is standard time,
1556 the tz library's localtime and mktime functions now set the extern
1557 variable timezone to a value appropriate for that timestamp; and
1558 similarly for ALTZONE, daylight saving time, and the altzone variable.
1559 This change is a companion to the tzname change in 2014h, and is
1560 designed to make timezone and altzone more compatible with tzname.
1562 The tz library's functions now set errno to EOVERFLOW if they fail
1563 because the result cannot be represented. ctime and ctime_r now
1564 return NULL and set errno when a timestamp is out of range, rather
1565 than having undefined behavior.
1567 Some bugs associated with the new 2014g functions have been fixed.
1568 This includes a bug that largely incapacitated the new functions
1569 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.)
1570 It also includes some uses of uninitialized variables after tzalloc.
1571 The new code uses the standard type 'ssize_t', which the Makefile
1572 now gives porting advice about.
1574 Changes affecting commentary
1576 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis).
1579 Release 2014h - 2014-09-25 18:59:03 -0700
1581 Changes affecting past timestamps
1583 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28.
1585 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01,
1586 not 1920-01-06. The old entry was based on a misinterpretation of Shanks.
1588 Some more zones have been turned into links, when they differed
1589 from existing zones only for older timestamps. As usual,
1590 these changes affect UT offsets in pre-1970 timestamps only.
1591 Their old contents have been moved to the 'backzone' file.
1592 The affected zones are: Africa/Blantyre, Africa/Bujumbura,
1593 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi,
1594 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane.
1596 Changes affecting code
1598 zdump -V and -v now output gmtoff= values on all platforms,
1599 not merely on platforms defining TM_GMTOFF.
1601 The tz library's localtime and mktime functions now set tzname to a value
1602 appropriate for the requested timestamp, and zdump now uses this
1603 on platforms not defining TM_ZONE, fixing a 2014g regression.
1604 (Thanks to Tim Parenti for reporting the problem.)
1606 The tz library no longer sets tzname if localtime or mktime fails.
1608 zdump -c no longer mishandles transitions near year boundaries.
1609 (Thanks to Tim Parenti for reporting the problem.)
1611 An access to uninitialized data has been fixed.
1612 (Thanks to Jörg Richter for reporting the problem.)
1614 When THREAD_SAFE is defined, the code ports to the C11 memory model.
1615 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined
1616 and two threads race to initialize data used by gmtime-like functions.
1617 (Thanks to Andy Heninger for reporting the problems.)
1619 Changes affecting build procedure
1621 'make check' now checks better for properly-sorted data.
1623 Changes affecting documentation and commentary
1625 zdump's gmtoff=N output is now documented, and its isdst=D output
1626 is now documented to possibly output D values other than 0 or 1.
1628 zdump -c's treatment of years is now documented to use the
1629 Gregorian calendar and Universal Time without leap seconds,
1630 and its behavior at cutoff boundaries is now documented better.
1631 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.)
1633 Programs are now documented to use the proleptic Gregorian calendar.
1634 (Thanks to Alan Barrett for the suggestion.)
1636 Fractional-second GMT offsets have been documented for civil time
1637 in 19th-century Chennai, Jakarta, and New York.
1640 Release 2014g - 2014-08-28 12:31:23 -0700
1642 Changes affecting future timestamps
1644 Turks & Caicos is switching from US eastern time to UT -04
1645 year-round, modeled as a switch on 2014-11-02 at 02:00.
1646 [As noted in 2014j, this switch was later delayed.]
1648 Changes affecting past timestamps
1650 Time in Russia or the USSR before 1926 or so has been corrected by
1651 a few seconds in the following zones: Asia/Irkutsk,
1652 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi,
1653 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For
1654 Asia/Yekaterinburg the correction is a few minutes. (Thanks to
1655 Vladimir Karpinsky.)
1657 The Portuguese decree of 1911-05-26 took effect on 1912-01-01.
1658 This affects 1911 timestamps in Africa/Bissau, Africa/Luanda,
1659 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912
1660 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32.
1661 (Thanks to Stephen Colebourne for pointing to the decree.)
1663 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59.
1665 A new file 'backzone' contains data which may appeal to
1666 connoisseurs of old timestamps, although it is out of scope for
1667 the tz database, is often poorly sourced, and contains some data
1668 that is known to be incorrect. The new file is not recommended
1669 for ordinary use and its entries are not installed by default.
1670 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and
1671 Isle of Man entries.)
1673 Some more zones have been turned into links, when they differed
1674 from existing zones only for older timestamps. As usual,
1675 these changes affect UT offsets in pre-1970 timestamps only.
1676 Their old contents have been moved to the 'backzone' file.
1677 The affected zones are: Africa/Bangui, Africa/Brazzaville,
1678 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda,
1679 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo.
1681 Changes affecting code
1683 Unless NETBSD_INSPIRED is defined to 0, the tz library now
1684 supplies functions for creating and using objects that represent
1685 time zones. The new functions are tzalloc, tzfree, localtime_rz,
1686 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and
1687 time2posix_z. They are intended for performance: for example,
1688 localtime_rz (unlike localtime_r) is trivially thread-safe without
1689 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired
1690 functions, and to Alan Barrett and Jonathan Lennox for helping to
1693 zdump now builds with the tz library unless USE_LTZ is defined to 0,
1694 This lets zdump use tz features even if the system library lacks them.
1695 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0
1696 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='.
1698 zdump now uses localtime_rz if available, as it's significantly faster,
1699 and it can help zdump better diagnose invalid time zone names.
1700 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ
1701 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is
1702 not available, zdump now uses localtime_r and tzset if available,
1703 as this is a bit cleaner and faster than plain localtime. Compile
1704 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system
1705 lacks these two functions.
1707 If THREAD_SAFE is defined to 1, the tz library is now thread-safe.
1708 Although not needed for tz's own applications, which are single-threaded,
1709 this supports POSIX better if the tz library is used in multithreaded apps.
1711 Some crashes have been fixed when zdump or the tz library is given
1712 invalid or outlandish input.
1714 The tz library no longer mishandles leap seconds on platforms with
1715 unsigned time_t in time zones that lack ordinary transitions after 1970.
1717 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not
1718 already defined, to make it easier to configure on common platforms.
1719 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this.
1721 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now
1722 assumes that reading uninitialized memory yields garbage values
1723 but does not cause other problems such as traps.
1725 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now
1726 more likely to guess right for ambiguous timestamps near
1727 transitions where tm_isdst does not change.
1729 If HAVE_STRFTIME_L is defined to 1, the tz library now defines
1730 strftime_l for compatibility with recent versions of POSIX.
1731 Only the C locale is supported, though. HAVE_STRFTIME_L defaults
1732 to 1 on recent POSIX versions, and to 0 otherwise.
1734 tzselect -c now uses a hybrid distance measure that works better
1735 in Africa. (Thanks to Alan Barrett for noting the problem.)
1737 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used,
1738 or when time_tz is defined.
1740 When HAVE_UTMPX_H is set the 'date' command now builds on systems
1741 whose <utmpx.h> file does not define WTMPX_FILE, and when setting
1742 the date it updates the wtmpx file if _PATH_WTMPX is defined.
1743 This affects GNU/Linux and similar systems.
1745 For easier maintenance later, some C code has been simplified,
1746 some lint has been removed, and the code has been tweaked so that
1747 plain 'make' is more likely to work.
1749 The C type 'bool' is now used for boolean values, instead of 'int'.
1751 The long-obsolete LOCALE_HOME code has been removed.
1753 The long-obsolete 'gtime' function has been removed.
1755 Changes affecting build procedure
1757 'zdump' no longer links in ialloc.o, as it's not needed.
1759 'make check_time_t_alternatives' no longer assumes GNU diff.
1761 Changes affecting distribution tarballs
1763 The files checktab.awk and zoneinfo2tdf.pl are now distributed in
1764 the tzdata tarball instead of the tzcode tarball, since they help
1765 maintain the data. The NEWS and Theory files are now also
1766 distributed in the tzdata tarball, as they're relevant for data.
1767 (Thanks to Alan Barrett for pointing this out.) Also, the
1768 leapseconds.awk file is no longer distributed in the tzcode
1769 tarball, since it belongs in the tzdata tarball (where 2014f
1770 inadvertently also distributed it).
1772 Changes affecting documentation and commentary
1774 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for
1775 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms
1778 The man pages have been updated to use function prototypes,
1779 to document thread-safe variants like localtime_r, and to document
1780 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and
1783 The fields in Link lines have been renamed to be more descriptive
1784 and more like the parameters of 'ln'. LINK-FROM has become TARGET,
1785 and LINK-TO has become LINK-NAME.
1787 tz-link.htm mentions the IETF's tzdist working group; Windows
1788 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab.
1790 Some broken URLs have been fixed in the commentary. (Thanks to
1793 Commentary about Philippines DST has been updated, and commentary
1794 on pre-1970 time in India has been added.
1797 Release 2014f - 2014-08-05 17:42:36 -0700
1799 Changes affecting future timestamps
1801 Russia will subtract an hour from most of its time zones on 2014-10-26
1802 at 02:00 local time. (Thanks to Alexander Krivenyshev.)
1803 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky
1804 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug
1805 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast
1806 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic
1807 (Europe/Samara) are not changing their clocks. The changed zones are
1808 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd,
1809 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk,
1810 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga,
1811 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours
1812 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected,
1813 but not its UTC offset. Two zones are added: Asia/Chita (split
1814 from Asia/Yakutsk, and also with two hours subtracted) and
1815 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour
1816 subtracted). (Thanks to Tim Parenti for much of the above.)
1818 Changes affecting time zone abbreviations
1820 Australian eastern time zone abbreviations are now AEST/AEDT not EST,
1821 and similarly for the other Australian zones. That is, for eastern
1822 standard and daylight saving time the abbreviations are AEST and AEDT
1823 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT,
1824 and AWST/AWDT are now used instead of the former CST, CWST, and WST.
1825 This change does not affect UT offsets, only time zone abbreviations.
1826 (Thanks to Rich Tibbett and many others.)
1828 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07)
1829 effective 2014-10-26 at 02:00 local time.
1831 The time zone abbreviation for Xinjiang Time (observed in Ürümqi)
1832 has been changed from URUT to XJT. (Thanks to Luther Ma.)
1834 Prefer MSK/MSD for Moscow time in Russia, even in other cities.
1835 Similarly, prefer EET/EEST for eastern European time in Russia.
1837 Change time zone abbreviations in (western) Samoa to use "ST" and
1838 "DT" suffixes, as this is more likely to match common practice.
1839 Prefix "W" to (western) Samoa time when its standard-time offset
1840 disagrees with that of American Samoa.
1842 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone.
1844 Time zone abbreviations have been updated for Japan's two time
1845 zones used 1896-1937. JWST now stands for Western Standard
1846 Time, and JCST for Central Standard Time (formerly this was CJT).
1847 These abbreviations are now used for time in Korea, Taiwan,
1848 and Sakhalin while controlled by Japan.
1850 Changes affecting past timestamps
1852 China's five zones have been simplified to two, since the post-1970
1853 differences in the other three seem to have been imaginary. The
1854 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been
1855 removed; backwards-compatibility links still work, albeit with
1856 different behaviors for timestamps before May 1980. Asia/Urumqi's
1857 1980 transition to UT +08 has been removed, so that it is now at
1858 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl;
1859 Treindl sent helpful translations of two papers by Guo Qingsheng.)
1861 Some zones have been turned into links, when they differed from existing
1862 zones only for older UT offsets where data entries were likely invented.
1863 These changes affect UT offsets in pre-1970 timestamps only. This is
1864 similar to the change in release 2013e, except this time for western
1865 Africa. The affected zones are: Africa/Bamako, Africa/Banjul,
1866 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome,
1867 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and
1868 Atlantic/St_Helena. This also affects the backwards-compatibility
1869 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne,
1870 Tim Parenti, and David Patte for reporting problems in earlier
1871 versions of this change.)
1873 Asia/Shanghai's pre-standard-time UT offset has been changed from
1874 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its
1875 transition to standard time has been changed from 1928 to 1901.
1877 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01,
1878 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945.
1879 In 1946 it observed DST from 05-15 through 09-30; in 1947
1880 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30.
1881 (Thanks to Yu-Cheng Chuang.)
1883 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950.
1885 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not
1886 10-03 at 00:00. (Thanks to Konstantin Hyppönen.)
1888 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the
1889 period from 1911 to 1950.
1891 Pacific/Chatham has been changed to New Zealand standard time plus
1892 45 minutes for the period before 1957, reflecting a 1956 remark in
1893 the New Zealand parliament.
1895 Europe/Budapest has several pre-1946 corrections: in 1918 the transition
1896 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in
1897 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08
1898 not 04-06 at 02:00; and there was no DST in 1920.
1900 Africa/Accra is now assumed to have observed DST from 1920 through 1935.
1902 Time in Russia before 1927 or so has been corrected by a few seconds in
1903 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi,
1904 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and
1905 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0
1906 point. (Thanks to Vladimir Karpinsky for the Moscow changes.)
1908 Changes affecting data format
1910 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data.
1911 The new file's extended format allows multiple country codes per zone.
1912 The older file is still installed but is deprecated; its format is
1913 not changing and it will still be distributed for a while, but new
1914 applications should use the new file.
1916 The new file format simplifies maintenance of obscure locations.
1917 To test this, it adds coverage for the Crozet Islands and the
1918 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.)
1920 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8.
1921 It is still ASCII now, but commentary about the switch has been added.
1922 The new file 'zone1970.tab' already uses UTF-8.
1924 Changes affecting code
1926 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE
1927 is defined. (Thanks to Elliott Hughes for reporting the problem.)
1929 'zic' no longer mishandles input when ignoring case in locales that
1930 are not compatible with English, e.g., unibyte Turkish locales when
1931 compiled with HAVE_GETTEXT.
1933 Error diagnostics of 'zic' and 'yearistype' have been reworded so that
1934 they no longer use ASCII '-' as if it were a dash.
1936 'zic' now rejects output file names that contain '.' or '..' components.
1937 (Thanks to Tim Parenti for reporting the problem.)
1939 'zic -v' now warns about output file names that do not follow
1940 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur
1941 David Olson for starting the ball rolling on this.)
1943 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0.
1945 Changes affecting build procedure
1947 'zic' no longer links in localtime.o and asctime.o, as they're not needed.
1948 (Thanks to John Cochran.)
1950 Changes affecting documentation and commentary
1952 The 'Theory' file documents legacy names, the longstanding
1953 exceptions to the POSIX-inspired file name rules.
1955 The 'zic' documentation clarifies the role of time types when
1956 interpreting dates. (Thanks to Arthur David Olson.)
1958 Documentation and commentary now prefer UTF-8 to US-ASCII,
1959 allowing the use of proper accents in foreign words and names.
1960 Code and data have not changed because of this. (Thanks to
1961 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug
1964 Non-HTML documentation and commentary now use plain-text URLs instead of
1965 HTML insertions, and are more consistent about bracketing URLs when they
1966 are not already surrounded by white space. (Thanks to suggestions by
1969 There is new commentary about Xujiahui Observatory, the five time-zone
1970 project in China from 1918 to 1949, timekeeping in Japanese-occupied
1971 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the
1972 warlord Jin Shuren in the data.
1974 Commentary about the coverage of each Russian zone has been standardized.
1975 (Thanks to Tim Parenti).
1977 There is new commentary about contemporary timekeeping in Ethiopia.
1979 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed.
1981 There is new commentary about time in Poland in 1919.
1983 Proper credit has been given to DST inventor George Vernon Hudson.
1985 Commentary about time in Metlakatla, AK and Resolute, NU has been
1986 improved, with a new source for the former.
1988 In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it
1991 Commentary about permanent Antarctic bases has been updated.
1993 Several typos have been corrected. (Thanks to Tim Parenti for
1994 contributing some of these fixes.)
1996 tz-link.htm now mentions the JavaScript libraries Moment Timezone,
1997 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up
1998 from Matt Johnson.) Also, it mentions the Go 'latlong' package.
1999 (Thanks to a heads-up from Dirkjan Ochtman.)
2001 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998
2002 have been removed. These obsolescent US Naval Observatory entries were no
2003 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.)
2006 Release 2014e - 2014-06-12 21:53:52 -0700
2008 Changes affecting near-future timestamps
2010 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00.
2011 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily
2012 switch to standard time at 24:00 the last Thursday before Ramadan, and
2013 back to DST at 00:00 the first Friday after Ramadan.
2015 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks
2016 to Milamber Space Network.) Guess that from 2015 on Morocco will
2017 temporarily switch to standard time at 03:00 the last Saturday before
2018 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan.
2020 Changes affecting past timestamps
2022 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of
2023 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo
2024 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time
2025 in 1991. (Thanks to Hank W. for reporting the problems.)
2027 Changes affecting commentary
2029 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the
2030 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and
2031 removes stale pointers to World Time Explorer and WORLDTIME.
2034 Release 2014d - 2014-05-27 21:34:40 -0700
2036 Changes affecting code
2038 zic no longer generates files containing timestamps before the Big Bang.
2039 This works around GNOME bug 730332
2040 <https://bugzilla.gnome.org/show_bug.cgi?id=730332>.
2041 (Thanks to Leonardo Chiquitto for reporting the bug, and to
2042 Arthur David Olson and James Cloos for suggesting improvements to the fix.)
2044 Changes affecting documentation
2046 tz-link.htm now mentions GNOME.
2049 Release 2014c - 2014-05-13 07:44:13 -0700
2051 Changes affecting near-future timestamps
2053 Egypt observes DST starting 2014-05-15 at 24:00.
2054 (Thanks to Ahmad El-Dardiry and Gunther Vermier.)
2055 Details have not been announced, except that DST will not be observed
2056 during Ramadan. Guess that DST will stop during the same Ramadan dates as
2057 Morocco, and that Egypt's future spring and fall transitions will be the
2058 same as 2010 when it last observed DST, namely April's last Friday at
2059 00:00 to September's last Thursday at 23:00 standard time. Also, guess
2060 that Ramadan transitions will be at 00:00 standard time.
2062 Changes affecting code
2064 zic now generates transitions for minimum time values, eliminating guesswork
2065 when handling low-valued timestamps. (Thanks to Arthur David Olson.)
2067 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.)
2069 Changes affecting commentary and documentation
2071 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.)
2074 Release 2014b - 2014-03-24 21:28:50 -0700
2076 Changes affecting near-future timestamps
2078 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time.
2079 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU.
2081 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and
2082 Bengt-Inge Larsson.) This is currently an approximation; a better version
2083 will require the zic and localtime fixes mentioned below, and the plan is
2084 to wait for a while until at least the zic fixes propagate.
2086 Changes affecting code
2088 'zic' and 'localtime' no longer reject locations needing four transitions
2089 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).)
2090 Also, 'zic' avoids some unlikely failures due to integer overflow.
2092 Changes affecting build procedure
2094 'make check' now detects Rule lines defined but never used.
2095 The NZAQ rules, an instance of this problem, have been removed.
2097 Changes affecting commentary and documentation
2099 Fix Tuesday/Thursday typo in description of time in Israel.
2100 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.)
2102 Microsoft Windows 8.1 doesn't support tz database names. (Thanks
2103 to Donald MacQueen.) Instead, the Microsoft Windows Store app
2104 library supports them.
2106 Add comments about Johnston Island time in the 1960s.
2107 (Thanks to Lyle McElhaney.)
2109 Morocco's 2014 DST start will be as predicted.
2110 (Thanks to Sebastien Willemijns.)
2113 Release 2014a - 2014-03-07 23:30:29 -0800
2115 Changes affecting near-future timestamps
2117 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for
2118 the heads-up, and to Tim Parenti for simplifying the update.)
2120 Changes affecting past timestamps
2122 Fiji ended DST on 2014-01-19 at 02:00, not the previously-scheduled 03:00.
2123 (Thanks to Steffen Thorsen.)
2125 Ukraine switched from Moscow to Eastern European time on 1990-07-01
2126 (not 1992-01-01), and observed DST during the entire next winter.
2127 (Thanks to Vladimir in Moscow via Alois Treindl.)
2129 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03.
2130 (Thanks to Avigdor Finkelstein.)
2132 Changes affecting code
2134 A uninitialized-storage bug in 'localtime' has been fixed.
2135 (Thanks to Logan Chien.)
2137 Changes affecting the build procedure
2139 The settings for 'make check_web' now default to Ubuntu 13.10.
2141 Changes affecting commentary and documentation
2143 The boundary of the US Pacific time zone is given more accurately.
2144 (Thanks to Alan Mintz.)
2146 Chile's 2014 DST will be as predicted. (Thanks to José Miguel Garrido.)
2148 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Raúl Perasso.)
2150 Better descriptions of countries with same time zone history as
2151 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.)
2153 Several changes affect tz-link.htm, the main web page.
2155 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to
2158 Mention xCal (Internet RFC 6321) and jCal.
2160 Microsoft has some support for tz database names.
2162 CLDR data formats include both XML and JSON.
2164 Mention Maggiolo's map of solar vs standard time.
2165 (Thanks to Arthur David Olson.)
2167 Mention TZ4Net. (Thanks to Matt Johnson.)
2169 Mention the timezone-olson Haskell package.
2171 Mention zeitverschiebung.net. (Thanks to Martin Jäger.)
2173 Remove moribund links to daylight-savings-time.info and to
2174 Simple Timer + Clocks.
2176 Update two links. (Thanks to Oscar van Vlijmen.)
2178 Fix some formatting glitches, e.g., remove random newlines from
2179 abbr elements' title attributes.
2182 Release 2013i - 2013-12-17 07:25:23 -0800
2184 Changes affecting near-future timestamps:
2186 Jordan switches back to standard time at 00:00 on December 20, 2013.
2187 The 2006-2011 transition schedule is planned to resume in 2014.
2188 (Thanks to Steffen Thorsen.)
2190 Changes affecting past timestamps:
2192 In 2004, Cuba began DST on March 28, not April 4.
2193 (Thanks to Steffen Thorsen.)
2195 Changes affecting code
2197 The compile-time flag NOSOLAR has been removed, as nowadays the
2198 benefit of slightly shrinking runtime table size is outweighed by the
2199 cost of disallowing potential future updates that exceed old limits.
2201 Changes affecting documentation and commentary
2203 The files solar87, solar88, and solar89 are no longer distributed.
2204 They were a negative experiment - that is, a demonstration that
2205 tz data can represent solar time only with some difficulty and error.
2206 Their presence in the distribution caused confusion, as Riyadh
2207 civil time was generally not solar time in those years.
2209 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.)
2212 Release 2013h - 2013-10-25 15:32:32 -0700
2214 Changes affecting current and future timestamps:
2216 Libya has switched its UT offset back to +02 without DST, instead
2217 of +01 with DST. (Thanks to Even Scharning.)
2219 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules.
2220 (Thanks to Gwillim Law.)
2222 Changes affecting future timestamps:
2224 Acre and (we guess) western Amazonas will switch from UT -04 to -05
2225 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe.
2226 (Thanks to Steffen Thorsen.)
2228 Add entries for DST transitions in Morocco in the year 2038.
2229 This avoids some year-2038 glitches introduced in 2013g.
2230 (Thanks to Yoshito Umaoka for reporting the problem.)
2232 Changes affecting API
2234 The 'tzselect' command no longer requires the 'select' command,
2235 and should now work with /bin/sh on more platforms. It also works
2236 around a bug in BusyBox awk before version 1.21.0. (Thanks to
2237 Patrick 'P. J.' McDermott and Alan Barrett.)
2239 Changes affecting code
2241 Fix localtime overflow bugs with 32-bit unsigned time_t.
2243 zdump no longer assumes sscanf returns maximal values on overflow.
2245 Changes affecting the build procedure
2247 The builder can specify which programs to use, if any, instead of
2248 'ar' and 'ranlib', and libtz.a is now built locally before being
2249 installed. (Thanks to Michael Forney.)
2251 A dependency typo in the 'zdump' rule has been fixed.
2252 (Thanks to Andrew Paprocki.)
2254 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f'
2255 work as specified by POSIX.2-1992 or later; this is portable nowadays.
2257 'make clean' no longer removes 'leapseconds', since it's
2258 host-independent and is part of the distribution.
2260 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed.
2262 Changes affecting documentation and commentary
2264 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol
2265 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle).
2267 Update URLs in tz-link page. Add URLs for Microsoft Windows, since
2268 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no
2269 longer maintained) and for old advisories. SOFA now does C.
2271 Release 2013g - 2013-09-30 21:08:26 -0700
2273 Changes affecting current and near-future timestamps
2275 Morocco now observes DST from the last Sunday in March to the last
2276 Sunday in October, not April to September respectively. (Thanks
2277 to Steffen Thorsen.)
2279 Changes affecting 'zic'
2281 'zic' now runs on platforms that lack both hard links and symlinks.
2282 (Thanks to Theo Veenker for reporting the problem, for MinGW.)
2283 Also, fix some bugs on platforms that lack hard links but have symlinks.
2285 'zic -v' again warns that Asia/Tehran has no POSIX environment variable
2286 to predict the far future, fixing a bug introduced in 2013e.
2288 Changes affecting the build procedure
2290 The 'leapseconds' file is again put into the tzdata tarball.
2291 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to
2292 Matt Burgess and Ian Abbott.) The timestamps of these and other
2293 dependent files in tarballs are adjusted more consistently.
2295 Changes affecting documentation and commentary
2297 The README file is now part of the data tarball as well as the code.
2298 It now states that files are public domain unless otherwise specified.
2299 (Thanks to Andrew Main (Zefram) for asking for clarifications.)
2300 Its details about the 1989 release moved to a place of honor near
2304 Release 2013f - 2013-09-24 23:37:36 -0700
2306 Changes affecting near-future timestamps
2308 Tocantins will very likely not observe DST starting this spring.
2309 (Thanks to Steffen Thorsen.)
2311 Jordan will likely stay at UT +03 indefinitely, and will not fall
2314 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.)
2316 Changes affecting API
2318 The types of the global variables 'timezone' and 'altzone' (if present)
2319 have been changed back to 'long'. This is required for 'timezone'
2320 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11.
2321 These variables were originally 'long' in the tz code, but were
2322 mistakenly changed to 'time_t' in 1987; nobody reported the
2323 incompatibility until now. The difference matters on x32, where
2324 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.)
2326 Changes affecting the build procedure
2328 Avoid long strings in leapseconds.awk to work around a mawk bug.
2329 (Thanks to Cyril Baurand.)
2331 Changes affecting documentation and commentary
2333 New file 'NEWS' that contains release notes like this one.
2335 Paraguay's law does not specify DST transition time; 00:00 is customary.
2336 (Thanks to Waldemar Villamayor-Venialbo.)
2338 Minor capitalization fixes.
2340 Changes affecting version-control only
2342 The experimental GitHub repository now contains annotated and
2343 signed tags for recent releases, e.g., '2013e' for Release 2013e.
2344 Releases are tagged starting with 2012e; earlier releases were
2345 done differently, and tags would either not have a simple name or
2346 not exactly match what was released.
2348 'make set-timestamps' is now simpler and a bit more portable.
2351 Release 2013e - 2013-09-19 23:50:04 -0700
2353 Changes affecting near-future timestamps
2355 This year Fiji will start DST on October 27, not October 20.
2356 (Thanks to David Wheeler for the heads-up.) For now, guess that
2357 Fiji will continue to spring forward the Sunday before the fourth
2360 Changes affecting current and future time zone abbreviations
2362 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian
2363 time zone abbreviations since 1932. (Thanks to George Ziegler,
2364 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and
2365 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura,
2366 Asia/Makassar, and Asia/Pontianak.
2368 Use ART (UT -03, standard time), rather than WARST (also -03, but
2369 daylight saving time) for San Luis, Argentina since 2009.
2371 Changes affecting Godthåb timestamps after 2037 if version mismatch
2373 Allow POSIX-like TZ strings where the transition time's hour can
2374 range from -167 through 167, instead of the POSIX-required 0
2375 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the
2376 new Fiji rules. This is a more-compact way to represent
2377 far-future timestamps for America/Godthab, America/Santiago,
2378 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem,
2379 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by
2380 this change. (Derived from a suggestion by Arthur David Olson.)
2382 Allow POSIX-like TZ strings where daylight saving time is in
2383 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western
2384 Argentina Summer Time all year. This supports a more-compact way
2385 to represent the 2013d data for America/Argentina/San_Luis.
2386 Because of the change for San Luis noted above this change does not
2387 affect the current data. (Thanks to Andrew Main (Zefram) for
2388 suggestions that improved this change.)
2390 Where these two TZ changes take effect, there is a minor extension
2391 to the tz file format in that it allows new values for the
2392 embedded TZ-format string, and the tz file format version number
2393 has therefore been increased from 2 to 3 as a precaution.
2394 Version-2-based client code should continue to work as before for
2395 all timestamps before 2038. Existing version-2-based client code
2396 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format
2397 files, and typically works in practice even for timestamps after
2398 2037; the only known exception is America/Godthab.
2400 Changes affecting timestamps before 1970
2402 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects
2403 some errors before 1947.
2405 Some zones have been turned into links, when they differ from existing
2406 zones only in older data entries that were likely invented or that
2407 differ only in LMT or transitions from LMT. These changes affect
2408 only timestamps before 1943. The affected zones are:
2409 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica,
2410 America/Grenada, America/Guadeloupe, America/Marigot,
2411 America/Montserrat, America/St_Barthelemy, America/St_Kitts,
2412 America/St_Lucia, America/St_Thomas, America/St_Vincent,
2413 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for
2414 confirming that the old Europe/Vaduz zone was wrong and the new
2415 link is better for WWII-era times.)
2417 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects
2418 America/Cayman, America/Jamaica and America/Grand_Turk timestamps
2421 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46.
2422 This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks
2425 Change the date of the circa-1850 Zurich transition from 1849-09-12
2426 to 1853-07-16, overriding Shanks with data from Messerli about
2427 postal and telegraph time in Switzerland.
2429 Changes affecting time zone abbreviations before 1970
2431 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932,
2432 as Jakarta was called Batavia back then.
2434 Changes affecting API
2436 The 'zic' command now outputs a dummy transition when far-future
2437 data can't be summarized using a TZ string, and uses a 402-year
2438 window rather than a 400-year window. For the current data, this
2439 affects only the Asia/Tehran file. It does not affect any of the
2440 timestamps that this file represents, so zdump outputs the same
2441 information as before. (Thanks to Andrew Main (Zefram).)
2443 The 'date' command has a new '-r' option, which lets you specify
2444 the integer time to display, a la FreeBSD.
2446 The 'tzselect' command has two new options '-c' and '-n', which lets you
2447 select a zone based on latitude and longitude.
2449 The 'zic' command's '-v' option now warns about constructs that
2450 require the new version-3 binary file format. (Thanks to Arthur
2451 David Olson for the suggestion.)
2453 Support for floating-point time_t has been removed.
2454 It was always dicey, and POSIX no longer requires it.
2455 (Thanks to Eric Blake for suggesting to the POSIX committee to
2456 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy
2457 Heninger, Arthur David Olson, and Alois Treindl, for reporting
2458 bugs and elucidating some of the corners of the old floating-point
2461 The signatures of 'offtime', 'timeoff', and 'gtime' have been
2462 changed back to the old practice of using 'long' to represent UT
2463 offsets. This had been inadvertently and mistakenly changed to
2464 'int_fast32_t'. (Thanks to Christos Zoulas.)
2466 The code avoids undefined behavior on integer overflow in some
2467 more places, including gmtime, localtime, mktime and zdump.
2469 Changes affecting the zdump utility
2471 zdump now outputs "UT" when referring to Universal Time, not "UTC".
2472 "UTC" does not make sense for timestamps that predate the introduction
2473 of UTC, whereas "UT", a more-generic term, does. (Thanks to Steve Allen
2474 for clarifying UT vs UTC.)
2476 Data changes affecting behavior of tzselect and similar programs
2478 Country code BQ is now called the more-common name "Caribbean Netherlands"
2479 rather than the more-official "Bonaire, St Eustatius & Saba".
2481 Remove from zone.tab the names America/Montreal, America/Shiprock,
2482 and Antarctica/South_Pole, as they are equivalent to existing
2483 same-country-code zones for post-1970 timestamps. The data entries for
2484 these names are unchanged, so the names continue to work as before.
2486 Changes affecting code internals
2488 zic -c now runs way faster on 64-bit hosts when given large numbers.
2490 zic now uses vfprintf to avoid allocating and freeing some memory.
2492 tzselect now computes the list of continents from the data,
2493 rather than have it hard-coded.
2495 Minor changes pacify GCC 4.7.3 and GCC 4.8.1.
2497 Changes affecting the build procedure
2499 The 'leapseconds' file is now generated automatically from a
2500 new file 'leap-seconds.list', which is a copy of
2501 <ftp://ftp.nist.gov/pub/time/leap-seconds.list>
2502 A new source file 'leapseconds.awk' implements this.
2503 The goal is simplification of the future maintenance of 'leapseconds'.
2505 When building the 'posix' or 'right' subdirectories, if the
2506 subdirectory would be a copy of the default subdirectory, it is
2507 now made a symbolic link if that is supported. This saves about
2508 2 MB of file system space.
2510 The links America/Shiprock and Antarctica/South_Pole have been
2511 moved to the 'backward' file. This affects only nondefault builds
2512 that omit 'backward'.
2514 Changes affecting version-control only
2516 .gitignore now ignores 'date'.
2518 Changes affecting documentation and commentary
2520 Changes to the 'tzfile' man page
2522 It now mentions that the binary file format may be extended in
2523 future versions by appending data.
2525 It now refers to the 'zdump' and 'zic' man pages.
2527 Changes to the 'zic' man page
2529 It lists conditions that elicit a warning with '-v'.
2531 It says that the behavior is unspecified when duplicate names
2532 are given, or if the source of one link is the target of another.
2534 Its examples are updated to match the latest data.
2536 The definition of white space has been clarified slightly.
2537 (Thanks to Michael Deckers.)
2539 Changes to the 'Theory' file
2541 There is a new section about the accuracy of the tz database,
2542 describing the many ways that errors can creep in, and
2543 explaining why so many of the pre-1970 timestamps are wrong or
2544 misleading (thanks to Steve Allen, Lester Caine, and Garrett
2545 Wollman for discussions that contributed to this).
2547 The 'Theory' file describes LMT better (this follows a
2548 suggestion by Guy Harris).
2550 It refers to the 2013 edition of POSIX rather than the 2004 edition.
2552 It's mentioned that excluding 'backward' should not affect the
2553 other data, and it suggests at least one zone.tab name per
2554 inhabited country (thanks to Stephen Colebourne).
2556 Some longstanding restrictions on names are documented, e.g.,
2557 'America/New_York' precludes 'America/New_York/Bronx'.
2559 It gives more reasons for the 1970 cutoff.
2561 It now mentions which time_t variants are supported, such as
2562 signed integer time_t. (Thanks to Paul Goyette for reporting
2563 typos in an experimental version of this change.)
2565 (Thanks to Philip Newton for correcting typos in these changes.)
2567 Documentation and commentary is more careful to distinguish UT in
2568 general from UTC in particular. (Thanks to Steve Allen.)
2570 Add a better source for the Zurich 1894 transition.
2571 (Thanks to Pierre-Yves Berger.)
2573 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.)
2576 Release 2013d - 2013-07-05 07:38:01 -0700
2578 Changes affecting future timestamps:
2580 Morocco's midsummer transitions this year are July 7 and August 10,
2581 not July 9 and August 8. (Thanks to Andrew Paprocki.)
2583 Israel now falls back on the last Sunday of October.
2584 (Thanks to Ephraim Silverberg.)
2586 Changes affecting past timestamps:
2588 Specify Jerusalem's location more precisely; this changes the pre-1880
2591 Changing affecting metadata only:
2593 Fix typos in the entries for country codes BQ and SX.
2595 Changes affecting code:
2597 Rework the code to fix a bug with handling Australia/Macquarie on
2598 32-bit hosts (thanks to Arthur David Olson).
2600 Port to platforms like NetBSD, where time_t can be wider than long.
2602 Add support for testing time_t types other than the system's.
2603 Run 'make check_time_t_alternatives' to try this out.
2604 Currently, the tests fail for unsigned time_t;
2605 this should get fixed at some point.
2607 Changes affecting documentation and commentary:
2609 Deemphasize the significance of national borders.
2611 Update the zdump man page.
2613 Remove obsolete NOID comment (thanks to Denis Excoffier).
2615 Update several URLs and comments in the web pages.
2617 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler).
2619 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka).
2622 Release 2013c - 2013-04-19 16:17:40 -0700
2624 Changes affecting current and future timestamps:
2626 Palestine observed DST starting March 29, 2013. (Thanks to
2627 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST,
2628 with the predicted rules being the last Thursday in March at 24:00
2629 to the first Friday on or after September 21 at 01:00.
2631 Assume that the recent change to Paraguay's DST rules is permanent,
2632 by moving the end of DST to the 4th Sunday in March every year.
2633 (Thanks to Carlos Raúl Perasso.)
2635 Changes affecting past timestamps:
2637 Fix some historical data for Palestine to agree with that of
2638 timeanddate.com, as follows:
2640 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not
2643 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not
2646 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27.
2648 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2.
2650 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01.
2652 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00.
2654 Fix times of habitation for Macquarie to agree with the Tasmania
2655 Parks & Wildlife Service history, which indicates that permanent
2656 habitation was 1899-1919 and 1948 on.
2658 Changing affecting metadata only:
2660 Macquarie Island is politically part of Australia, not Antarctica.
2661 (Thanks to Tobias Conradi.)
2663 Sort Macquarie more-consistently with other parts of Australia.
2664 (Thanks to Tim Parenti.)
2667 Release 2013b - 2013-03-10 22:33:40 -0700
2669 Changes affecting current and future timestamps:
2671 Haiti uses US daylight-saving rules this year, and presumably future years.
2672 This changes timestamps starting today. (Thanks to Steffen Thorsen.)
2674 Paraguay will end DST on March 24 this year.
2675 (Thanks to Steffen Thorsen.) For now, assume it's just this year.
2677 Morocco does not observe DST during Ramadan;
2678 try to predict Ramadan in Morocco as best we can.
2679 (Thanks to Erik Homoet for the heads-up.)
2681 Changes affecting commentary:
2683 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS.
2684 Update URL for Solaris. Mention Internet RFC 6557.
2685 Update Internet RFCs 2445->5545, 2822->5322.
2686 Switch from FTP to HTTP for Internet RFCs.
2689 Release 2013a - 2013-02-27 09:20:35 -0800
2691 Change affecting binary data format:
2693 The zone offset at the end of version-2-format zone files is now
2694 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.)
2696 Changes affecting current and future timestamps:
2698 Chile's 2013 rules, and we guess rules for 2014 and later, will be
2699 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC.
2700 (Thanks to Steffen Thorsen and Robert Elz.)
2702 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen.
2703 (Thanks to Tobias Conradi and Arthur David Olson.)
2705 Many changes affect historical timestamps before 1940.
2706 These were deduced from: Milne J. Civil time. Geogr J. 1899
2707 Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>.
2709 Changes affecting the code:
2711 Fix zic bug that mishandled Egypt's 2010 changes (this also affected
2712 the data). (Thanks to Arthur David Olson.)
2714 Fix localtime bug when time_t is unsigned and data files were generated
2715 by a signed time_t system. (Thanks to Doug Bailey for reporting and
2716 to Arthur David Olson for fixing.)
2718 Allow the email address for bug reports to be set by the packager.
2719 The default is tz@iana.org, as before. (Thanks to Joseph S. Myers.)
2721 Update HTML checking to be compatible with Ubuntu 12.10.
2723 Check that files are a safe subset of ASCII. At some point we may
2724 relax this requirement to a safe subset of UTF-8. Without the
2725 check, some non-UTF-8 encodings were leaking into the distribution.
2729 Restore a comment about copyright notices that was inadvertently deleted.
2730 (Thanks to Arthur David Olson.)
2732 Improve the commentary about which districts observe what times
2733 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson).
2735 Add web page links to tz.js.
2737 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.)
2740 Release 2012j - 2012-11-12 18:34:49 -0800
2742 Libya moved to CET this weekend, but with DST planned next year.
2743 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.)
2745 Signatures now have the extension .asc, not .sign, as that's more
2746 standard. (Thanks to Phil Pennock.)
2748 The output of 'zdump --version', and of 'zic --version', now
2749 uses a format that is more typical for --version.
2750 (Thanks to Joseph S. Myers.)
2752 The output of 'tzselect --help', 'zdump --help', and 'zic --help'
2753 now uses tz@iana.org rather than the old elsie address.
2755 zic -v now complains about abbreviations that are less than 3
2756 or more than 6 characters, as per Posix. Formerly, it checked
2757 for abbreviations that were more than 3.
2759 'make public' no longer puts its temporary directory under /tmp,
2760 and uses the just-built zic rather than the system zic.
2762 Various fixes to documentation and commentary.
2765 Release 2012i - 2012-11-03 12:57:09 -0700
2767 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.)
2769 Linker flags can now be specified via LDFLAGS.
2770 AWK now defaults to 'awk', not 'nawk'.
2771 The shell in tzselect now defaults to /bin/bash, but this can
2772 be overridden by specifying KSHELL.
2773 The main web page now mentions the unofficial GitHub repository.
2774 (Thanks to Mike Frysinger.)
2776 Tarball signatures can now be built by running 'make signatures'.
2777 There are also new makefile rules 'tarballs', 'check_public', and
2778 separate makefile rules for each tarball and signature file.
2779 A few makefile rules are now more portable to strict POSIX.
2781 The main web page now lists the canonical IANA URL.
2784 Release 2012h - 2012-10-26 22:49:10 -0700
2786 Bahia no longer has DST. (Thanks to Kelley Cook.)
2788 Tocantins has DST. (Thanks to Rodrigo Severo.)
2790 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.)
2792 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.)
2796 More C modernization, except that at Arthur David Olson's suggestion
2797 the instances of 'register' were kept.
2800 Release 2012g - 2012-10-17 20:59:45 -0700
2802 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.)
2804 Palestine fall 2012. (Thanks to Steffen Thorsen.)
2808 To attack the version-number problem, this release ships the file
2809 'Makefile' (which contains the release number) in both the tzcode and
2810 the tzdata tarballs. The two Makefiles are identical, and should be
2811 identical in any matching pair of tarballs, so it shouldn't matter
2812 which order you extract the tarballs. Perhaps we can come up with a
2813 better version-number scheme at some point; this scheme does have the
2814 virtue of not adding more files.
2817 Release 2012f - 2012-09-12 23:17:03 -0700
2819 * australasia (Pacific/Fiji): Fiji DST is October 21 through January
2820 20 this year. (Thanks to Steffen Thorsen.)
2823 Release 2012e - 2012-08-02 20:44:55 -0700
2825 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14.
2826 (Thanks to Steffen Thorsen.)
2828 * Use a single version number for both code and data.
2830 * .gitignore: New file.
2832 * Remove trailing white space.
2835 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700
2837 Changes for Morocco's timestamps, which take effect in a couple of
2838 hours, along with infrastructure changes to accommodate how the tz
2839 code and data are released on IANA.
2842 Release data2012c - 2012-03-27 12:17:25 -0400
2845 Summer time changes for Morocco (to start late April 2012)
2848 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria
2851 Haiti following US/Canada rules for 2012 (and we're assuming,
2852 for now anyway, for the future).
2855 Release 2012b - 2012-03-02 12:29:15 +0700
2857 There is just one change to tzcode2012b (compared with 2012a):
2858 the Makefile that was accidentally included with 2012a has been
2859 replaced with the version that should have been there, which is
2860 identical with the previous version (from tzcode2011i).
2862 There are just two changes in tzdata2012b compared with 2012a.
2864 Most significantly, summer time in Cuba has been delayed 3 weeks
2865 (now starts April 1 rather than March 11). Since Mar 11 (the old start
2866 date, as listed in 2012a) is just a little over a week away, this
2869 Less importantly, an excess tab in one of the changes in zone.tab
2870 in 2012a has been removed.
2873 Release 2012a - 2012-03-01 18:28:10 +0700
2875 The changes in tzcode2012a (compared to the previous version, 2011i)
2876 are entirely to the README and tz-art.htm and tz-link.htm files, if
2877 none of those concern you, you can ignore the code update. The changes
2878 reflect the changed addresses for the mailing list and the code and
2879 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile
2880 has been added to tz-link.htm).
2882 In tzdata2012a (compared to the previous release, which was 2011n)
2883 the major changes are:
2884 Chile 2011/2012 and 2012/2013 summer time date adjustments.
2885 Falkland Islands onto permanent summer time (we're assuming for the
2886 foreseeable future, though 2012 is all we're fairly certain of.)
2887 Armenia has abolished Summer Time.
2888 Tokelau jumped the International Date Line back last December
2889 (just the same as their near neighbour, Samoa).
2890 America/Creston is a new zone for a small area of British Columbia
2891 There will be a leapsecond 2012-06-30 23:59:60 UTC.
2893 Other minor changes are:
2894 Corrections to 1918 Canadian summer time end dates.
2895 Updated URL for UK time zone history (in comments)
2896 A few typos in Le Corre's list of free French place names (comments)
2899 Release data2011n - 2011-10-30 14:57:54 +0700
2901 There are three changes of note - most urgently, Cuba (America/Havana)
2902 has extended summer time by two weeks, now to end on Nov 13, rather than
2903 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic
2904 (Europe/Tiraspol) decided not to split from the rest of Moldova after
2905 all, and consequently that zone has been removed (again) and reinstated
2906 in the "backward" file as a link to Europe/Chisinau. And third, the
2907 end date for Fiji's summer time this summer was moved forward from the
2908 earlier planned Feb 26, to Jan 22.
2910 Apart from that, Moldova (MD) returns to a single entry in zone.tab
2911 (and the incorrect syntax that was in the 2011m version of that file
2912 is so fixed - it would have been fixed in a different way had this
2913 change not happened - that's the "missing" sccs version id).
2916 Release data2011m - 2011-10-24 21:42:16 +0700
2918 In particular, the typos in comments in the data (2011-11-17 should have
2919 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that
2920 Tim Parenti noted) have been fixed, and the change for Ukraine has been
2921 made in all 4 Ukrainian zones, rather than just Kiev (again, thanks to
2922 Tim Parenti, and also Denys Gavrysh)
2924 In addition, I added Europe/Tiraspol to zone.tab.
2926 This time, all the files have new version numbers... (including the files
2927 otherwise unchanged in 2011m that were changed in 2011l but didn't get new
2928 version numbers there...)
2931 Release data2011l - 2011-10-10 11:15:43 +0700
2933 There are just 2 changes that cause different generated tzdata files from
2934 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil
2935 is included, but commented out. Compared with the diff I sent out last week,
2936 this version also includes attributions for the sources for the changes
2937 (in much the same format as ado used, but the html tags have not been
2938 checked, verified, or used in any way at all, so if there are errors there,
2939 please let me know.)
2942 Release data2011k - 2011-09-20 17:54:03 -0400
2947 Release data2011j - 2011-09-12 09:22:49 -0400
2949 (contemporary changes for Samoa; past changes for Kenya, Uganda, and
2950 Tanzania); there are also two spelling corrections to comments in
2951 the australasia file (with thanks to Christos Zoulas).
2954 Release 2011i - 2011-08-29 05:56:32 -0400
2959 Release data2011h - 2011-06-15 18:41:48 -0400
2961 Russia and Curaçao changes
2964 Release 2011g - 2011-04-25 09:07:22 -0400
2966 update the rules for Egypt to reflect its abandonment of DST this year
2969 Release 2011f - 2011-04-06 17:14:53 -0400
2974 Release 2011e - 2011-03-31 16:04:38 -0400
2976 Morocco, Chile, and tz-link changes
2979 Release 2011d - 2011-03-14 09:18:01 -0400
2981 changes that impact present-day timestamps in Cuba, Samoa, and Turkey
2984 Release 2011c - 2011-03-07 09:30:09 -0500
2986 These do affect current timestamps in Chile and Annette Island, Canada.
2989 Release 2011b - 2011-02-07 08:44:50 -0500
2994 Release 2011a - 2011-01-24 10:30:16 -0500
2999 Release data2010o - 2010-11-01 09:18:23 -0400
3001 change to the end of DST in Fiji in 2011
3004 Release 2010n - 2010-10-25 08:19:17 -0400
3009 Release 2010m - 2010-09-27 09:24:48 -0400
3011 Hong Kong, Vostok, and zic.c changes
3014 Release 2010l - 2010-08-16 06:57:25 -0400
3019 Release 2010k - 2010-07-26 10:42:27 -0400
3024 Release 2010j - 2010-05-10 09:07:48 -0400
3026 changes for Bahía de Banderas and for version naming
3029 Release data2010i - 2010-04-16 18:50:45 -0400
3031 the end of DST in Morocco on 2010-08-08
3034 Release data2010h - 2010-04-05 09:58:56 -0400
3039 Release data2010g - 2010-03-24 11:14:53 -0400
3044 Release 2010f - 2010-03-22 09:45:46 -0400
3049 Release data2010e - 2010-03-08 14:24:27 -0500
3051 corrects the Dhaka bug found by Danvin Ruangchan
3054 Release data2010d - 2010-03-06 07:26:01 -0500
3059 Release 2010c - 2010-03-01 09:20:58 -0500
3061 changes including KRE's suggestion for earlier initialization of
3062 "goahead" and "goback" structure elements
3065 Release code2010a - 2010-02-16 10:40:04 -0500
3070 Release data2010b - 2010-01-20 12:37:01 -0500
3075 Release data2010a - 2010-01-18 08:30:04 -0500
3080 Release data2009u - 2009-12-26 08:32:28 -0500
3082 changes to DST in Bangladesh
3085 Release 2009t - 2009-12-21 13:24:27 -0500
3090 Release data2009s - 2009-11-14 10:26:32 -0500
3092 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change
3095 Release 2009r - 2009-11-09 10:10:31 -0500
3097 "antarctica" and "tz-link.htm" changes
3100 Release 2009q - 2009-11-02 09:12:40 -0500
3102 with two corrections as reported by Eric Muller and Philip Newton
3105 Release data2009p - 2009-10-23 15:05:27 -0400
3107 Argentina (including San Luis) changes (with the correction from
3111 Release data2009o - 2009-10-14 16:49:38 -0400
3113 Samoa (commentary only), Pakistan, and Bangladesh changes
3116 Release data2009n - 2009-09-22 15:13:38 -0400
3118 added commentary for Argentina and a change to the end of DST in
3122 Release data2009m - 2009-09-03 10:23:43 -0400
3124 Samoa and Palestine changes
3127 Release data2009l - 2009-08-14 09:13:07 -0400
3129 Samoa (comments only) and Egypt
3132 Release 2009k - 2009-07-20 09:46:08 -0400
3137 Release data2009j - 2009-06-15 06:43:59 -0400
3139 Bangladesh change (with a short turnaround since the DST change is
3143 Release 2009i - 2009-06-08 09:21:22 -0400
3145 updating for DST in Bangladesh this year
3148 Release 2009h - 2009-05-26 09:19:14 -0400
3153 Release data2009g - 2009-04-20 16:34:07 -0400
3158 Release data2009f - 2009-04-10 11:00:52 -0400
3160 correct DST in Pakistan
3163 Release 2009e - 2009-04-06 09:08:11 -0400
3168 Release 2009d - 2009-03-23 09:38:12 -0400
3170 Morocco, Tunisia, Argentina, and American Astronomical Society changes
3173 Release data2009c - 2009-03-16 09:47:51 -0400
3175 change to the start of Cuban DST
3178 Release 2009b - 2009-02-09 11:15:22 -0500
3183 Release 2009a - 2009-01-21 10:09:39 -0500
3188 Release data2008i - 2008-10-21 12:10:25 -0400
3190 southamerica and zone.tab files, with Argentina DST rule changes and
3191 United States zone reordering and recommenting
3194 Release 2008h - 2008-10-13 07:33:56 -0400
3199 Release 2008g - 2008-10-06 09:03:18 -0400
3201 Fix a broken HTML anchor and update Brazil's DST transitions;
3202 there's also a slight reordering of information in tz-art.htm.
3205 Release data2008f - 2008-09-09 22:33:26 -0400
3210 Release 2008e - 2008-07-28 14:11:17 -0400
3212 changes by Arthur David Olson and Jesper Nørgaard Welen
3215 Release data2008d - 2008-07-07 09:51:38 -0400
3217 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo
3220 Release data2008c - 2008-05-19 17:48:03 -0400
3222 Pakistan, Morocco, and Mongolia
3225 Release data2008b - 2008-03-24 08:30:59 -0400
3227 including renaming Asia/Calcutta to Asia/Kolkata, with a backward
3231 Release 2008a - 2008-03-08 05:42:16 -0500
3236 Release 2007k - 2007-12-31 10:25:22 -0500
3238 most importantly, changes to the "southamerica" file based on
3239 Argentina's readoption of daylight saving time
3242 Release 2007j - 2007-12-03 09:51:01 -0500
3244 1. eliminate the "P" (parameter) macro;
3246 2. the "noncontroversial" changes circulated on the time zone
3247 mailing list (less the changes to "logwtmp.c");
3249 3. eliminate "too many transition" errors when "min" is used in time
3252 4. changes by Paul Eggert (including updated information for Venezuela).
3255 Release data2007i - 2007-10-30 10:28:11 -0400
3257 changes for Cuba and Syria
3260 Release 2007h - 2007-10-01 10:05:51 -0400
3262 changes by Paul Eggert, as well as an updated link to the ICU
3263 project in tz-link.htm
3266 Release 2007g - 2007-08-20 10:47:59 -0400
3268 changes by Paul Eggert
3270 The "leapseconds" file has been updated to incorporate the most
3271 recent International Earth Rotation and Reference Systems Service
3274 There's an addition to tz-art.htm regarding the television show "Medium".
3277 Release 2007f - 2007-05-07 10:46:46 -0400
3279 changes by Paul Eggert (including Haiti, Turks and Caicos, and New
3282 changes to zic.c to allow hour values greater than 24 (along with
3283 Paul's improved time value overflow checking)
3286 Release 2007e - 2007-04-02 10:11:52 -0400
3288 Syria and Honduras changes by Paul Eggert
3290 zic.c variable renaming changes by Arthur David Olson
3293 Release 2007d - 2007-03-20 08:48:30 -0400
3295 changes by Paul Eggert
3297 the elimination of white space at the ends of lines
3300 Release 2007c - 2007-02-26 09:09:37 -0500
3302 changes by Paul Eggert
3305 Release 2007b - 2007-02-12 09:34:20 -0500
3307 Paul Eggert's proposed change to the quotation handling logic in zic.c.
3309 changes to the commentary in "leapseconds" reflecting the IERS
3310 announcement that there is to be no positive leap second at the end
3314 Release 2007a - 2007-01-08 12:28:29 -0500
3316 changes by Paul Eggert
3318 Derick Rethan's Asmara change
3320 Oscar van Vlijmen's Easter Island local mean time change
3322 symbolic link changes
3325 Release 2006p - 2006-11-27 08:54:27 -0500
3327 changes by Paul Eggert
3330 Release 2006o - 2006-11-06 09:18:07 -0500
3332 changes by Paul Eggert
3335 Release 2006n - 2006-10-10 11:32:06 -0400
3337 changes by Paul Eggert
3340 Release 2006m - 2006-10-02 15:32:35 -0400
3342 changes for Uruguay, Palestine, and Egypt by Paul Eggert
3344 (minimalist) changes to zic.8 to clarify "until" information
3347 Release data2006l - 2006-09-18 12:58:11 -0400
3349 Paul's best-effort work on this coming weekend's Egypt time change
3352 Release 2006k - 2006-08-28 12:19:09 -0400
3354 changes by Paul Eggert
3357 Release 2006j - 2006-08-21 09:56:32 -0400
3359 changes by Paul Eggert
3362 Release code2006i - 2006-08-07 12:30:55 -0400
3366 Ken Pizzini's conversion script
3369 Release code2006h - 2006-07-24 09:19:37 -0400
3371 adds public domain notices to four files
3373 includes a fix for transition times being off by a second
3375 adds a new recording to the "arts" file (information courtesy Colin Bowern)
3378 Release 2006g - 2006-05-08 17:18:09 -0400
3380 northamerica changes by Paul Eggert
3383 Release 2006f - 2006-05-01 11:46:00 -0400
3385 a missing version number problem is fixed (with thanks to Bradley
3386 White for catching the problem)
3389 Release 2006d - 2006-04-17 14:33:43 -0400
3391 changes by Paul Eggert
3393 added new items to tz-arts.htm that were found by Paul
3396 Release 2006c - 2006-04-03 10:09:32 -0400
3398 two sets of data changes by Paul Eggert
3400 a fencepost error fix in zic.c
3402 changes to zic.c and the "europe" file to minimize differences
3403 between output produced by the old 32-bit zic and the new 64-bit
3407 Release 2006b - 2006-02-20 10:08:18 -0500
3408 [tz32code2006b + tz64code2006b + tzdata2006b]
3412 All SCCS IDs were bumped to "8.1" for this release.
3415 Release 2006a - 2006-01-30 08:59:31 -0500
3417 changes by Paul Eggert (in particular, Indiana time zone moves)
3419 an addition to the zic manual page to describe how special-case
3420 transitions are handled
3423 Release 2005r - 2005-12-27 09:27:13 -0500
3425 Canadian changes by Paul Eggert
3427 They also add "<pre>" directives to time zone data files and reflect
3428 changes to warning message logic in "zdump.c" (but with calls to
3429 "gettext" kept unbundled at the suggestion of Ken Pizzini).
3432 Release 2005q - 2005-12-13 09:17:09 -0500
3434 Nothing earth-shaking here:
3435 1. Electronic mail addresses have been removed.
3436 2. Casts of the return value of exit have been removed.
3437 3. Casts of the argument of is.* macros have been added.
3438 4. Indentation in one section of zic.c has been fixed.
3439 5. References to dead URLs in the data files have been dealt with.
3442 Release 2005p - 2005-12-05 10:30:53 -0500
3444 "systemv", "tz-link.htm", and "zdump.c" changes
3445 (less the casts of arguments to the is* macros)
3448 Release 2005o - 2005-11-28 10:55:26 -0500
3450 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert
3452 zdump.c lint fixes by Arthur David Olson
3455 Release 2005n - 2005-10-03 09:44:09 -0400
3457 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan
3461 Release 2005m - 2005-08-29 12:15:40 -0400
3463 changes by Paul Eggert (with a small tweak to the tz-art change)
3465 a declaration of an unused variable has been removed from zdump.c
3468 Release 2005l - 2005-08-22 12:06:39 -0400
3470 changes by Paul Eggert
3472 overflow/underflow checks by Arthur David Olson, minus changes to
3473 the "Theory" file about the pending addition of 64-bit data (I grow
3474 less confident of the changes being accepted with each passing day,
3475 and the changes no longer increase the data files nine-fold--there's
3476 less than a doubling in size by my local Sun's reckoning)
3479 Release 2005k - 2005-07-14 14:14:24 -0400
3481 The "leapseconds" file has been edited to reflect the recently
3482 announced leap second at the end of 2005.
3484 I've also deleted electronic mail addresses from the files as an
3488 Release 2005j - 2005-06-13 14:34:13 -0400
3490 These reflect changes to limit the length of time zone abbreviations
3491 and the characters used in those abbreviations.
3493 There are also changes to handle POSIX-style "quoted" time zone
3494 environment variables.
3496 The changes were circulated on the time zone mailing list; the only
3497 change since then was the removal of a couple of minimum-length of
3498 abbreviation checks.
3501 Release data2005i - 2005-04-21 15:04:16 -0400
3503 changes (most importantly to Nicaragua and Haiti) by Paul Eggert
3506 Release 2005h - 2005-04-04 11:24:47 -0400
3508 changes by Paul Eggert
3510 minor changes to Makefile and zdump.c to produce more useful output
3511 when doing a "make typecheck"
3514 Release 2005g - 2005-03-14 10:11:21 -0500
3516 changes by Paul Eggert (a change to current DST rules in Uruguay and
3517 an update to a link to time zone software)
3520 Release 2005f - 2005-03-01 08:45:32 -0500
3522 data and documentation changes by Paul Eggert
3525 Release 2005e - 2005-02-10 15:59:44 -0500
3530 Release code2005d - 2005-01-31 09:21:47 -0500
3532 make zic complain about links to links if the -v flag is used
3534 have "make public" do more code checking
3536 add an include to "localtime.c" for the benefit of gcc systems
3539 Release 2005c - 2005-01-17 18:36:29 -0500
3541 get better results when mktime runs on a system where time_t is double
3543 changes to the data files (most importantly to Paraguay)
3546 Release 2005b - 2005-01-10 09:19:54 -0500
3548 Get localtime and gmtime working on systems with exotic time_t types.
3550 Update the leap second commentary in the "leapseconds" file.
3553 Release 2005a - 2005-01-01 13:13:44 -0500
3558 Release code2004i - 2004-12-14 13:42:58 -0500
3560 Deal with systems where time_t is unsigned.
3563 Release code2004h - 2004-12-07 11:40:18 -0500
3565 64-bit-time_t changes
3568 Release 2004g - 2004-11-02 09:06:01 -0500
3570 update to Cuba (taking effect this weekend)
3572 other changes by Paul Eggert
3574 correction of the spelling of Oslo
3576 changed versions of difftime.c and private.h
3579 Release code2004f - 2004-10-21 10:25:22 -0400
3581 Cope with wide-ranging tm_year values.
3584 Release 2004e - 2004-10-11 14:47:21 -0400
3586 Brazil/Argentina/Israel changes by Paul Eggert
3588 changes to tz-link.htm by Paul
3590 one small fix to Makefile
3593 Release 2004d - 2004-09-22 08:27:29 -0400
3595 Avoid overflow problems when TM_YEAR_BASE is added to an integer.
3598 Release 2004c - 2004-08-11 12:06:26 -0400
3600 asctime-related changes
3602 (variants of) some of the documentation changes suggested by Paul Eggert
3605 Release 2004b - 2004-07-19 14:33:35 -0400
3607 data changes by Paul Eggert - most importantly, updates for Argentina
3610 Release 2004a - 2004-05-27 12:00:47 -0400
3612 changes by Paul Eggert
3614 Handle DST transitions that occur at the end of a month in some
3615 years but at the start of the following month in other years.
3617 Add a copy of the correspondence that's the basis for claims about
3618 DST in the Navajo Nation.
3621 Release 2003e - 2003-12-15 09:36:47 -0500
3623 changes by Arthur David Olson (primarily code changes)
3625 changes by Paul Eggert (primarily data changes)
3627 minor changes to "Makefile" and "northamerica" (in the latter case,
3628 optimization of the "Toronto" rules)
3631 Release 2003d - 2003-10-06 09:34:44 -0400
3633 changes by Paul Eggert
3636 Release 2003c - 2003-09-16 10:47:05 -0400
3638 Fix bad returns in zic.c's inleap function.
3639 Thanks to Bradley White for catching the problem!
3642 Release 2003b - 2003-09-16 07:13:44 -0400
3644 Add a "--version" option (and documentation) to the zic and zdump commands.
3646 changes to overflow/underflow checking in zic
3648 a localtime typo fix.
3650 Update the leapseconds and tz-art.htm files.
3653 Release 2003a - 2003-03-24 09:30:54 -0500
3655 changes by Paul Eggert
3657 a few additions and modifications to the tz-art.htm file
3660 Release 2002d - 2002-10-15 13:12:42 -0400
3662 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab
3664 There's also a new time zone quote in "tz-art.htm".
3667 Release 2002c - 2002-04-04 11:55:20 -0500
3669 changes by Paul Eggert
3671 Change zic.c to avoid creating symlinks to files that don't exist.
3674 Release 2002b - 2002-01-28 12:56:03 -0500
3676 [These change notes are for Release 2002a, which was corrupted.
3677 2002b was a corrected version of 2002a.]
3679 changes by Paul Eggert
3681 Update the "leapseconds" file to note that there'll be no leap
3682 second at the end of June, 2002.
3684 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone.
3686 Change to "difftime.c" to avoid sizeof problems.
3689 Release 2001d - 2001-10-09 13:31:32 -0400
3691 changes by Paul Eggert
3694 Release 2001c - 2001-06-05 13:59:55 -0400
3696 changes by Paul Eggert and Andrew Brown
3699 Release 2001b - 2001-04-05 16:44:38 -0400
3701 changes by Paul Eggert (modulo jnorgard's typo fix)
3703 tz-art.htm has been HTMLified.
3706 Release 2001a - 2001-03-13 12:57:44 -0500
3708 changes by Paul Eggert
3710 An addition to the "leapseconds" file: comments with the text of the
3711 latest IERS leap second notice.
3713 Trailing white space has been removed from data file lines, and
3714 repeated spaces in "Rule Jordan" lines in the "asia" file have been
3718 Release 2000h - 2000-12-14 15:33:38 -0500
3720 changes by Paul Eggert
3722 one typo fix in the "art" file
3724 With providence, this is the last update of the millennium.
3727 Release 2000g - 2000-10-10 11:35:22 -0400
3729 changes by Paul Eggert
3731 correction of John Mackin's name submitted by Robert Elz
3733 Garry Shandling's Daylight Saving Time joke (!?!) from the recent
3734 Emmy Awards broadcast.
3737 Release 2000f - 2000-08-10 09:31:58 -0400
3739 changes by Paul Eggert
3741 Added information in "tz-art.htm" on a Seinfeld reference to DST.
3743 Error checking and messages in the "yearistype" script have been
3747 Release 2000e - 2000-07-31 09:27:54 -0400
3749 data changes by Paul Eggert
3751 a change to the default value of the defined constant HAVE_STRERROR
3753 the addition of a Dave Barry quote on DST to the tz-arts file
3756 Release 2000d - 2000-04-20 15:43:04 -0400
3758 changes to the documentation and code of strftime for C99 conformance
3760 a bug fix for date.c
3762 These are based on (though modified from) changes by Paul Eggert.
3765 Release 2000c - 2000-03-04 10:31:43 -0500
3767 changes by Paul Eggert
3770 Release 2000b - 2000-02-21 12:16:29 -0500
3772 changes by Paul Eggert and Joseph Myers
3774 modest tweaks to the tz-art.htm and tz-link.htm files
3777 Release 2000a - 2000-01-18 09:21:26 -0500
3779 changes by Paul Eggert
3781 The two hypertext documents have also been renamed.
3784 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500
3786 Paul Eggert's changes
3788 additions to the "zic" manual page and the "Arts.htm" file
3791 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500
3796 Release data1999h - 1999-10-07 03:50:29 -0400
3798 changes by Paul Eggert to "europe" (most importantly, fixing
3799 Lithuania and Estonia)
3802 Release 1999g - 1999-09-28 11:06:18 -0400
3804 data changes by Paul Eggert (most importantly, the change for
3805 Lebanon that buys correctness for this coming Sunday)
3807 The "code" file contains changes to "Makefile" and "checktab.awk" to
3808 allow better checking of time zone files before they are published.
3811 Release 1999f - 1999-09-23 09:48:14 -0400
3813 changes by Arthur David Olson and Paul Eggert
3816 Release 1999e - 1999-08-17 15:20:54 -0400
3818 changes circulated by Paul Eggert, although the change to handling
3819 of DST-specifying time zone names has been commented out for now
3820 (search for "XXX" in "localtime.c" for details). These files also
3821 do not make any changes to the start of DST in Brazil.
3823 In addition to Paul's changes, there are updates to "Arts.htm" and
3827 Release 1999d - 1999-03-30 11:31:07 -0500
3829 changes by Paul Eggert
3831 The Makefile's "make public" rule has also been changed to do a test
3832 compile of each individual time zone data file (which should help
3833 avoid problems such as the one we had with Nicosia).
3836 Release 1999c - 1999-03-25 09:47:47 -0500
3838 changes by Paul Eggert, most importantly the change for Chile.
3841 Release 1999b - 1999-02-01 17:51:44 -0500
3843 changes by Paul Eggert
3845 code changes (suggested by Mani Varadarajan, mani at be.com) for
3846 correct handling of symbolic links when building using a relative directory
3848 code changes to generate correct messages for failed links
3850 updates to the URLs in Arts.htm
3853 Release 1999a - 1999-01-19 16:20:29 -0500
3855 error message internationalizations and corrections in zic.c and
3856 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz,
3860 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400
3862 changes for Brazil, Chile, and Germany
3864 support for use of "24:00" in the input files for the time zone compiler
3867 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400
3869 changes by Paul Eggert
3871 correction to a define in the "private.h" file
3874 Release data1998g - 1998-08-11 03:28:35 -0000
3875 [tzdata1998g.tar.gz is missing!]
3877 Lithuanian change provided by mgedmin at pub.osf.it
3879 Move creation of the GMT link with Etc/GMT to "etcetera" (from
3880 "backward") to ensure that the GMT file is created even where folks
3881 don't want the "backward" links (as suggested by Paul Eggert).
3884 Release data1998f - 1998-07-20 13:50:00 -0000
3885 [tzdata1998f.tar.gz is missing!]
3887 Update the "leapseconds" file to include the newly-announced
3888 insertion at the end of 1998.
3891 Release code1998f - 1998-06-01 10:18:31 -0400
3893 addition to localtime.c by Guy Harris
3896 Release 1998e - 1998-05-28 09:56:26 -0400
3898 The Makefile is changed to produce zoneinfo-posix rather than
3899 zoneinfo/posix, and to produce zoneinfo-leaps rather than
3902 data changes by Paul Eggert
3904 changes from Guy Harris to provide asctime_r and ctime_r
3906 A usno1998 file (substantially identical to usno1997) has been added.
3909 Release 1998d - 1998-05-14 11:58:34 -0400
3911 changes to comments (in particular, elimination of references to CIA maps).
3912 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places
3913 where changes occur.
3916 Release 1998c - 1998-02-28 12:32:26 -0500
3918 changes by Paul Eggert (save the "French correction," on which I'll
3919 wait for the dust to settle)
3923 changes and additions to Arts.htm
3926 Release 1998b - 1998-01-17 14:31:51 -0500
3928 URL cleanups and additions
3931 Release 1998a - 1998-01-13 12:37:35 -0500
3933 changes by Paul Eggert
3936 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500
3938 changes by Paul Eggert, with minor modifications from Arthur David
3939 Olson to make the files more browser friendly
3942 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500
3944 minor changes to put "TZif" at the start of each time zone information file
3946 a rule has also been added to the Makefile so you can
3948 to just recompile the zone information files (rather than doing a
3949 full "make install" with its other effects).
3952 Release data1997i - 1997-10-07 08:45:38 -0400
3954 changes to Africa by Paul Eggert
3957 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400
3959 corrections for Uruguay (and other locations)
3961 Arthur David Olson's simple-minded fix allowing mktime to both
3962 correctly handle leap seconds and correctly handle tm_sec values
3963 upon which arithmetic has been performed.
3966 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400
3968 Paul Eggert's updates
3970 a small change to a function prototype;
3972 "Music" has been renamed "Arts.htm", HTMLified, and augmented to
3973 include information on Around the World in Eighty Days.
3976 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400
3978 fixes to zic's error handling
3980 changes inspired by the item circulated on Slovenia
3982 The description of Web resources has been HTMLified for browsing
3985 A new piece of tz-related music has been added to the "Music" file.
3988 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500
3990 Paul Eggert's latest suggestions
3993 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500
3995 changes to "zic.c" to correct performance of the "-s" option
3997 a new file "usno1997"
4000 Release data1997c - 1997-03-04 09:58:18 -0500
4005 Release 1997b - 1997-02-27 18:34:19 -0500
4007 The data file incorporates the 1997 leap second.
4009 The code file incorporates Arthur David Olson's take on the
4010 zic/multiprocessor/directory-creation situation.
4013 Release 1997a - 1997-01-21 09:11:10 -0500
4015 Paul Eggert's Antarctica (and other changes)
4017 Arthur David Olson finessed the "getopt" issue by checking against
4018 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1
4019 is returned while SunOS 5.5's manual says EOF is returned).
4022 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500
4024 Paul Eggert's latest changes
4027 Release code1996n - 1996-12-16 09:42:02 -0500
4029 link snapping fix from Bruce Evans (via Garrett Wollman)
4032 Release data1996m - 1996-11-24 02:37:34 -0000
4033 [tzdata1996m.tar.gz is missing!]
4035 Paul Eggert's batch of changes
4038 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500
4040 No functional changes here; the files have simply been changed to
4041 make more use of ISO style dates in comments. The names of the above
4042 files now include the year in full.
4045 Release code96l - 1996-09-08 17:12:20 -0400
4047 tzcode96k was missing a couple of pieces.
4050 Release 96k - 1996-09-08 16:06:22 -0400
4052 the latest round of changes from Paul Eggert
4054 the recent Year 2000 material
4057 Release code96j - 1996-07-30 13:18:53 -0400
4059 Set sp->typecnt as suggested by Timothy Patrick Murphy.
4062 Release code96i - 1996-07-27 20:11:35 -0400
4064 Paul's suggested patch for strftime %V week numbers
4067 Release data96i - 1996-07-01 18:13:04 -0400
4069 "northamerica" and "europe" changes by Paul Eggert
4072 Release code96h - 1996-06-05 08:02:21 -0400
4074 fix for handling transitions specified in Universal Time
4076 Some "public domain" notices have also been added.
4079 Release code96g - 1996-05-16 14:00:26 -0400
4081 fix for the simultaneous-DST-and-zone-change challenge
4084 Release data96h - 1996-05-09 17:40:51 -0400
4086 changes by Paul Eggert
4089 Release code96f-data96g - 1996-05-03 03:09:59 -0000
4090 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!]
4092 The changes get us some of the way to fixing the problems noted in Paul
4093 Eggert's letter yesterday (in addition to a few others). The approach
4094 has been to make zic a bit smarter about figuring out what time zone
4095 abbreviations apply just after the time specified in the "UNTIL" part
4096 of a zone line. Putting the smarts in zic means avoiding having
4097 transition times show up in both "Zone" lines and "Rule" lines, which
4098 in turn avoids multiple transition time entries in time zone files.
4099 (This also makes the zic input files such as "europe" a bit shorter and
4100 should ease maintenance.)
4103 Release data96f - 1996-04-19 19:20:03 -0000
4104 [tzdata96f.tar.gz is missing!]
4106 The only changes are to the "northamerica" file; the time zone
4107 abbreviation for Denver is corrected to MST (and MDT), and the
4108 comments for Mexico have been updated.
4111 Release data96e - 1996-03-19 17:37:26 -0500
4113 Proposals by Paul Eggert, in particular the Portugal change that
4114 comes into play at the end of this month.
4117 Release data96d - 1996-03-18 20:49:39 -0500
4122 Release code96e - 1996-02-29 15:43:27 -0000
4123 [tzcode96e.tar.gz is missing!]
4125 internationalization changes and the fix to the documentation for strftime
4128 Release code96d-data96c - 1996-02-12 11:05:27 -0500
4130 The "code" file simply updates Bob Kridle's electronic address.
4132 The "data" file updates rules for Mexico.
4135 Release data96b - 1996-01-27 15:44:42 -0500
4140 Release code96c - 1996-01-16 16:58:15 -0500
4142 leap-year streamlining and binary-search changes
4147 Release code96b - 1996-01-10 20:42:39 -0500
4149 fixes and enhancements from Paul Eggert, including code that
4150 emulates the behavior of recent versions of the SunOS "date"
4154 Release 96a - 1996-01-06 09:08:24 -0500
4158 fixes to strftime.c for correct ISO 8601 week number generation,
4159 plus support for two new formats ('G' and 'g') to give ISO 8601 year
4160 numbers (which are not necessarily the same as calendar year numbers)
4163 Release code95i-data95m - 1995-12-21 12:46:47 -0500
4165 The latest revisions from Paul Eggert are included, the usno1995
4166 file has been updated, and a new file ("WWW") covering useful URLs
4170 Release code95h-data95l - 1995-12-19 18:10:12 -0500
4172 A simplification of a macro definition, a change to data for Sudan,
4173 and (for last minute shoppers) notes in the "Music" file on the CD
4177 Release code95g-data95k - 1995-10-30 10:32:47 -0500
4179 (slightly reformatted) 8-bit-clean proposed patch
4181 minor patch: US/Eastern -> America/New_York
4183 snapshot of the USNO's latest data ("usno1995")
4185 some other minor cleanups
4188 Release code95f-data95j - 1995-10-28 21:01:34 -0000
4189 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!]
4193 support for 64-bit time_t's
4195 optimization in localtime.c
4198 Release code95e - 1995-10-13 13:23:57 -0400
4200 the mktime change to scan from future to past when trying to find time zone
4204 Release data95i - 1995-09-26 10:43:26 -0400
4206 For Canada/Central, guess that the Sun customer's "one week too
4207 early" was just a approximation, and the true error is one month
4208 too early. This is consistent with the rest of Canada.
4211 Release data95h - 1995-09-21 11:26:48 -0400
4213 latest changes from Paul Eggert
4216 Release code95d - 1995-09-14 11:14:45 -0400
4218 the addition of a "Music" file, which documents four recorded
4219 versions of the tune "Save That Time".
4222 Release data95g - 1995-09-01 17:21:36 -0400
4224 "yearistype" correction
4227 Release data95f - 1995-08-28 20:46:56 -0400
4229 Paul Eggert's change to the australasia file
4232 Release data95e - 1995-07-08 18:02:34 -0400
4234 The only change is a leap second at the end of this year.
4235 Thanks to Bradley White for forwarding news on the leap second.
4238 Release data95d - 1995-07-03 13:26:22 -0400
4240 Paul Eggert's changes
4243 Release data95c - 1995-07-02 19:19:28 -0400
4245 changes to "asia", "backward", "europe", and "southamerica"
4246 (read: northamericacentrics need not apply)
4249 Release code95c - 1995-03-13 14:00:46 -0500
4251 one-line fix for sign extension problems in detzcode
4254 Release 95b - 1995-03-04 11:22:38 -0500
4256 Minor changes in both:
4258 The "code" file contains a workaround for the lack of "unistd.h" in
4259 Microsoft C++ version 7.
4261 The "data" file contains a fixed "Link" for America/Shiprock.
4264 Release 94h - 1994-12-10 12:51:14 -0500
4268 * incorporate the changes to "zdump" and "date" to make changes to
4269 the "TZ" environment variable permanent;
4271 * incorporate the table changes by Paul Eggert;
4273 * include (and document) support for universal time specifications in
4274 data files - but do not (yet) include use of this feature in the
4277 Think of this as "TZ Classic" - the software has been set up not to break if
4278 universal time shows up in its input, and data entries have been
4279 left as is so as not to break existing implementations.
4282 Release data94f - 1994-08-20 12:56:09 -0400
4284 (with thanks!) the latest data updates from Paul Eggert
4287 Release data94e - 1994-06-04 13:13:53 -0400
4292 Release code94g - 1994-05-05 12:14:07 -0400
4294 fix missing "optind.c" and a reference to it in the Makefile
4297 Release code94f - 1994-05-05 13:00:33 -0000
4298 [tzcode94f.tar.gz is missing!]
4300 changes to avoid overflow in difftime, as well as changes to cope
4301 with the 52/53 challenge in strftime
4304 Release code94e - 1994-03-30 23:32:59 -0500
4306 change for the benefit of PCTS
4309 Release 94d - 1994-02-24 15:42:25 -0500
4311 Avoid clashes with POSIX semantics for zones such as GMT+4.
4313 Some other very minor housekeeping is also present.
4316 Release code94c - 1994-02-10 08:52:40 -0500
4318 Fix bug where mkdirs was broken unless you compile with
4319 -fwritable-strings (which is generally losing to do).
4322 Release 94b - 1994-02-07 10:04:33 -0500
4324 work by Paul Eggert who notes:
4326 I found another book of time zone histories by E W Whitman; it's not
4327 as extensive as Shanks but has a few goodies of its own. I used it
4328 to update the tables. I also fixed some more as a result of
4329 correspondence with Adam David and Peter Ilieve, and move some stray
4330 links from 'europe' to 'backward'. I corrected some scanning errors
4333 As far as the code goes, I fixed zic to allow years in the range
4334 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900.
4335 And I cleaned up the zic documentation a little bit.
4338 Release data94a - 1994-02-03 08:58:54 -0500
4340 It simply incorporates the recently announced leap second into the
4344 Release 93g - 1993-11-22 17:28:27 -0500
4346 Paul Eggert has provided a good deal of historic information (based
4347 on Shanks), and there are some code changes to deal with the buglets
4348 that crawled out in dealing with the new information.
4351 Release 93f - 1993-10-15 12:27:46 -0400
4353 Paul Eggert's changes
4356 Release 93e - 1993-09-05 21:21:44 -0400
4358 This has updated data for Israel, England, and Kwajalein. There's
4359 also an update to "zdump" to cope with Kwajalein's 24-hour jump.
4360 Thanks to Paul Eggert and Peter Ilieve for the changes.
4363 Release 93d - 1993-06-17 23:34:17 -0400
4365 new fix and new data on Israel
4368 Release 93c - 1993-06-06 19:31:55 -0400
4373 Release 93b - 1993-02-02 14:53:58 -0500
4375 updated "leapseconds" file
4378 Release 93 - 1993-01-08 07:01:06 -0500
4380 At kre's suggestion, the package has been split in two - a code piece
4381 (which also includes documentation) that's only of use to folks who
4382 want to recompile things and a data piece useful to anyone who can
4385 The new version has a few changes to the data files, a few
4386 portability changes, and an off-by-one fix (with thanks to
4387 Tom Karzes at deshaw.com for providing a description and a
4391 Release 92c - 1992-11-21 17:35:36 -0000
4392 [tz92c.tar.Z is missing!]
4394 The fallout from the latest round of DST transitions.
4396 There are changes for Portugal, Saskatchewan, and "Pacific-New";
4397 there's also a change to "zic.c" that makes it portable to more systems.
4400 Release 92 - 1992-04-25 18:17:03 -0000
4401 [tz92.tar.Z is missing!]
4403 By popular demand (well, at any rate, following a request by kre at munnari)
4406 The 1989 update of the time zone package featured:
4408 * POSIXization (including interpretation of POSIX-style TZ environment
4409 variables, provided by Guy Harris),
4410 * ANSIfication (including versions of "mktime" and "difftime"),
4411 * SVIDulation (an "altzone" variable)
4412 * MACHination (the "gtime" function)
4413 * corrections to some time zone data (including corrections to the rules
4414 for Great Britain and New Zealand)
4415 * reference data from the United States Naval Observatory for folks who
4416 want to do additional time zones
4417 * and the 1989 data for Saudi Arabia.
4419 (Since this code will be treated as "part of the implementation" in some
4420 places and as "part of the application" in others, there's no good way to
4421 name functions, such as timegm, that are not part of the proposed ANSI C
4422 standard; such functions have kept their old, underscore-free names in this
4425 And the "dysize" function has disappeared; it was present to allow
4426 compilation of the "date" command on old BSD systems, and a version of "date"
4427 is now provided in the package. The "date" command is not created when you
4428 "make all" since it may lack options provided by the version distributed with
4429 your operating system, or may not interact with the system in the same way
4430 the native version does.
4432 Since POSIX frowns on correct leap second handling, the default behavior of
4433 the "zic" command (in the absence of a "-L" option) has been changed to omit
4434 leap second information from its output files.
4440 This file contains copies of the part of each release announcement
4441 that talks about the changes in that release. The text has been
4442 adapted and reformatted for the purposes of this file.
4444 Traditionally a release R consists of a pair of tarball files,
4445 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g.,
4446 code2010a, data2012c) consist of just one or the other tarball, and a
4447 few (e.g., code2012c-data2012d) have tarballs with mixed version
4448 numbers. Recent releases also come in an experimental format
4449 consisting of a single tarball tzdb-R.tar.lz with extra data.
4451 Release timestamps are taken from the release's commit (for newer,
4452 Git-based releases), from the newest file in the tarball (for older
4453 releases, where this info is available) or from the email announcing
4454 the release (if all else fails; these are marked with a time zone of
4455 -0000 and an "is missing!" comment).
4457 Earlier versions of the code and data were not announced on the tz
4458 list and are not summarized here.
4460 This file is in the public domain.