1News for the tz database 2 3Release 2025b - 2025-03-22 13:40:46 -0700 4 5 Briefly: 6 New zone for Aysén Region in Chile which moves from -04/-03 to -03. 7 8 Changes to future timestamps 9 10 Chile's Aysén Region moves from -04/-03 to -03 year-round, joining 11 Magallanes Region. The region will not change its clocks on 12 2025-04-05 at 24:00, diverging from America/Santiago and creating a 13 new zone America/Coyhaique. (Thanks to Yonathan Dossow.) Model 14 this as a change to standard offset effective 2025-03-20. 15 16 Changes to past timestamps 17 18 Iran switched from +04 to +0330 on 1978-11-10 at 24:00, not at 19 year end. (Thanks to Roozbeh Pournader.) 20 21 Changes to code 22 23 'zic -l TIMEZONE -d . -l /some/other/file/system' no longer 24 attempts to create an incorrect symlink, and no longer has a 25 read buffer underflow. (Problem reported by Evgeniy Gorbanev.) 26 27 28Release 2025a - 2025-01-15 10:47:24 -0800 29 30 Briefly: 31 Paraguay adopted permanent -03 starting spring 2024. 32 Improve pre-1991 data for the Philippines. 33 Etc/Unknown is now reserved. 34 35 Changes to future timestamps 36 37 Paraguay stopped changing its clocks after the spring-forward 38 transition on 2024-10-06, so it is now permanently at -03. 39 (Thanks to Heitor David Pinto and Even Scharning.) 40 This affects timestamps starting 2025-03-22, as well as the 41 obsolescent tm_isdst flags starting 2024-10-15. 42 43 Changes to past timestamps 44 45 Correct timestamps for the Philippines before 1900, and from 1937 46 through 1990. (Thanks to P Chan for the heads-up and citations.) 47 This includes adjusting local mean time before 1899; fixing 48 transitions in September 1899, January 1937, and June 1954; adding 49 transitions in December 1941, November 1945, March and September 50 1977, and May and July 1990; and removing incorrect transitions in 51 March and September 1978. 52 53 Changes to data 54 55 Add zone1970.tab lines for the Concordia and Eyre Bird Observatory 56 research stations. (Thanks to Derick Rethans and Jule Dabars.) 57 58 Changes to code 59 60 strftime %s now generates the correct numeric string even when the 61 represented number does not fit into time_t. This is better than 62 generating the numeric equivalent of (time_t) -1, as strftime did 63 in TZDB releases 96a (when %s was introduced) through 2020a and in 64 releases 2022b through 2024b. It is also better than failing and 65 returning 0, as strftime did in releases 2020b through 2022a. 66 67 strftime now outputs an invalid conversion specifier as-is, 68 instead of eliding the leading '%', which confused debugging. 69 70 An invalid TZ now generates the time zone abbreviation "-00", not 71 "UTC", to help the user see that an error has occurred. (Thanks 72 to Arthur David Olson for suggesting a "wrong result".) 73 74 mktime and timeoff no longer incorrectly fail merely because a 75 struct tm component near INT_MIN or INT_MAX overflows when a 76 lower-order component carries into it. 77 78 TZNAME_MAXIMUM, the maximum number of bytes in a proleptic TZ 79 string's time zone abbreviation, now defaults to 254 not 255. 80 This helps reduce the size of internal state from 25480 to 21384 81 on common platforms. This change should not be a problem, as 82 nobody uses such long "abbreviations" and the longstanding tzcode 83 maximum was 16 until release 2023a. For those who prefer no 84 arbitrary limits, you can now specify TZNAME_MAXIMUM values up to 85 PTRDIFF_MAX, a limit forced by C anyway; formerly tzcode silently 86 misbehaved unless TZNAME_MAXIMUM was less than INT_MAX. 87 88 tzset and related functions no longer leak a file descriptor if 89 another thread forks or execs at about the same time and if the 90 platform has O_CLOFORK and O_CLOEXEC respectively. Also, the 91 functions no longer let a TZif file become a controlling terminal. 92 93 'zdump -' now reads TZif data from /dev/stdin. 94 (From a question by Arthur David Olson.) 95 96 Changes to documentation 97 98 The name Etc/Unknown is now reserved: it will not be used by TZDB. 99 This is for compatibility with CLDR, which uses the string 100 "Etc/Unknown" for an unknown or invalid timezone. (Thanks to 101 Justin Grant, Mark Davis, and Guy Harris.) 102 103 Cite Internet RFC 9636, which obsoletes RFC 8536 for TZif format. 104 105 106Release 2024b - 2024-09-04 12:27:47 -0700 107 108 Briefly: 109 Improve historical data for Mexico, Mongolia, and Portugal. 110 System V names are now obsolescent. 111 The main data form now uses %z. 112 The code now conforms to RFC 8536 for early timestamps. 113 Support POSIX.1-2024, which removes asctime_r and ctime_r. 114 Assume POSIX.2-1992 or later for shell scripts. 115 SUPPORT_C89 now defaults to 1. 116 117 Changes to past timestamps 118 119 Asia/Choibalsan is now an alias for Asia/Ulaanbaatar rather than 120 being a separate Zone with differing behavior before April 2008. 121 This seems better given our wildly conflicting information about 122 Mongolia's time zone history. (Thanks to Heitor David Pinto.) 123 124 Historical transitions for Mexico have been updated based on 125 official Mexican decrees. The affected timestamps occur during 126 the years 1921-1927, 1931, 1945, 1949-1970, and 1981-1997. 127 The affected zones are America/Bahia_Banderas, America/Cancun, 128 America/Chihuahua, America/Ciudad_Juarez, America/Hermosillo, 129 America/Mazatlan, America/Merida, America/Mexico_City, 130 America/Monterrey, America/Ojinaga, and America/Tijuana. 131 (Thanks to Heitor David Pinto.) 132 133 Historical transitions for Portugal, represented by Europe/Lisbon, 134 Atlantic/Azores, and Atlantic/Madeira, have been updated based on a 135 close reading of old Portuguese legislation, replacing previous data 136 mainly originating from Whitman and Shanks & Pottenger. These 137 changes affect a few transitions in 1917-1921, 1924, and 1940 138 throughout these regions by a few hours or days, and various 139 timestamps between 1977 and 1993 depending on the region. In 140 particular, the Azores and Madeira did not observe DST from 1977 to 141 1981. Additionally, the adoption of standard zonal time in former 142 Portuguese colonies have been adjusted: Africa/Maputo in 1909, and 143 Asia/Dili by 22 minutes at the start of 1912. 144 (Thanks to Tim Parenti.) 145 146 Changes to past tm_isdst flags 147 148 The period from 1966-04-03 through 1966-10-02 in Portugal is now 149 modeled as DST, to more closely reflect how contemporaneous changes 150 in law entered into force. 151 152 Changes to data 153 154 Names present only for compatibility with UNIX System V 155 (last released in the 1990s) have been moved to 'backward'. 156 These names, which for post-1970 timestamps mostly just duplicate 157 data of geographical names, were confusing downstream uses. 158 Names moved to 'backward' are now links to geographical names. 159 This affects behavior for TZ='EET' for some pre-1981 timestamps, 160 for TZ='CET' for some pre-1947 timestamps, and for TZ='WET' for 161 some pre-1996 timestamps. Also, TZ='MET' now behaves like 162 TZ='CET' and so uses the abbreviation "CET" rather than "MET". 163 Those needing the previous TZDB behavior, which does not match any 164 real-world clocks, can find the old entries in 'backzone'. 165 (Problem reported by Justin Grant.) 166 167 The main source files' time zone abbreviations now use %z, 168 supported by zic since release 2015f and used in vanguard form 169 since release 2022b. For example, America/Sao_Paulo now contains 170 the zone continuation line "-3:00 Brazil %z", which is less error 171 prone than the old "-3:00 Brazil -03/-02". This does not change 172 the represented data: the generated TZif files are unchanged. 173 Rearguard form still avoids %z, to support obsolescent parsers. 174 175 Asia/Almaty has been removed from zonenow.tab as it now agrees 176 with Asia/Tashkent for future timestamps, due to Kazakhstan's 177 2024-02-29 time zone change. Similarly, America/Scoresbysund 178 has been removed, as it now agrees with America/Nuuk due to 179 its 2024-03-31 time zone change. 180 181 Changes to code 182 183 localtime.c now always uses a TZif file's time type 0 to handle 184 timestamps before the file's first transition. Formerly, 185 localtime.c sometimes inferred a different time type, in order to 186 handle problematic data generated by zic 2018e or earlier. As it 187 is now safe to assume more recent versions of zic, there is no 188 longer a pressing need to fail to conform RFC 8536 section 3.2, 189 which requires using time type 0 in this situation. This change 190 does not affect behavior when reading TZif files generated by zic 191 2018f and later. 192 193 POSIX.1-2024 removes asctime_r and ctime_r and does not let 194 libraries define them, so remove them except when needed to 195 conform to earlier POSIX. These functions are dangerous as they 196 can overrun user buffers. If you still need them, add 197 -DSUPPORT_POSIX2008 to CFLAGS. 198 199 The SUPPORT_C89 option now defaults to 1 instead of 0, fixing a 200 POSIX-conformance bug introduced in 2023a. 201 202 tzselect now supports POSIX.1-2024 proleptic TZ strings. Also, it 203 assumes POSIX.2-1992 or later, as practical porting targets now 204 all support that, and it uses some features from POSIX.1-2024 if 205 available. 206 207 Changes to build procedure 208 209 'make check' no longer requires curl and Internet access. 210 211 The build procedure now assumes POSIX.2-1992 or later, to simplify 212 maintenance. To build on Solaris 10, the only extant system still 213 defaulting to pre-POSIX, prepend /usr/xpg4/bin to PATH. 214 215 Changes to documentation 216 217 The documentation now reflects POSIX.1-2024. 218 219 Changes to commentary 220 221 Commentary about historical transitions in Portugal and her former 222 colonies has been expanded with links to relevant legislation. 223 (Thanks to Tim Parenti.) 224 225 226Release 2024a - 2024-02-01 09:28:56 -0800 227 228 Briefly: 229 Kazakhstan unifies on UTC+5 beginning 2024-03-01. 230 Palestine springs forward a week later after Ramadan. 231 zic no longer pretends to support indefinite-past DST. 232 localtime no longer mishandles Ciudad Juárez in 2422. 233 234 Changes to future timestamps 235 236 Kazakhstan unifies on UTC+5. This affects Asia/Almaty and 237 Asia/Qostanay which together represent the eastern portion of the 238 country that will transition from UTC+6 on 2024-03-01 at 00:00 to 239 join the western portion. (Thanks to Zhanbolat Raimbekov.) 240 241 Palestine springs forward a week later than previously predicted 242 in 2024 and 2025. (Thanks to Heba Hamad.) Change spring-forward 243 predictions to the second Saturday after Ramadan, not the first; 244 this also affects other predictions starting in 2039. 245 246 Changes to past timestamps 247 248 Asia/Ho_Chi_Minh's 1955-07-01 transition occurred at 01:00 249 not 00:00. (Thanks to Đoàn Trần Công Danh.) 250 251 From 1947 through 1949, Toronto's transitions occurred at 02:00 252 not 00:00. (Thanks to Chris Walton.) 253 254 In 1911 Miquelon adopted standard time on June 15, not May 15. 255 256 Changes to code 257 258 The FROM and TO columns of Rule lines can no longer be "minimum" 259 or an abbreviation of "minimum", because TZif files do not support 260 DST rules that extend into the indefinite past - although these 261 rules were supported when TZif files had only 32-bit data, this 262 stopped working when 64-bit TZif files were introduced in 1995. 263 This should not be a problem for realistic data, since DST was 264 first used in the 20th century. As a transition aid, FROM columns 265 like "minimum" are now diagnosed and then treated as if they were 266 the year 1900; this should suffice for TZif files on old systems 267 with only 32-bit time_t, and it is more compatible with bugs in 268 2023c-and-earlier localtime.c. (Problem reported by Yoshito 269 Umaoka.) 270 271 localtime and related functions no longer mishandle some 272 timestamps that occur about 400 years after a switch to a time 273 zone with a DST schedule. In 2023d data this problem was visible 274 for some timestamps in November 2422, November 2822, etc. in 275 America/Ciudad_Juarez. (Problem reported by Gilmore Davidson.) 276 277 strftime %s now uses tm_gmtoff if available. (Problem and draft 278 patch reported by Dag-Erling Smørgrav.) 279 280 Changes to build procedure 281 282 The leap-seconds.list file is now copied from the IERS instead of 283 from its downstream counterpart at NIST, as the IERS version is 284 now in the public domain too and tends to be more up-to-date. 285 (Thanks to Martin Burnicki for liaisoning with the IERS.) 286 287 Changes to documentation 288 289 The strftime man page documents which struct tm members affect 290 which conversion specs, and that tzset is called. (Problems 291 reported by Robert Elz and Steve Summit.) 292 293 294Release 2023d - 2023-12-21 20:02:24 -0800 295 296 Briefly: 297 Ittoqqortoormiit, Greenland changes time zones on 2024-03-31. 298 Vostok, Antarctica changed time zones on 2023-12-18. 299 Casey, Antarctica changed time zones five times since 2020. 300 Code and data fixes for Palestine timestamps starting in 2072. 301 A new data file zonenow.tab for timestamps starting now. 302 303 Changes to future timestamps 304 305 Ittoqqortoormiit, Greenland (America/Scoresbysund) joins most of 306 the rest of Greenland's timekeeping practice on 2024-03-31, by 307 changing its time zone from -01/+00 to -02/-01 at the same moment 308 as the spring-forward transition. Its clocks will therefore not 309 spring forward as previously scheduled. The time zone change 310 reverts to its common practice before 1981. (Thanks to Jule Dabars.) 311 312 Fix predictions for DST transitions in Palestine in 2072-2075, 313 correcting a typo introduced in 2023a. (Thanks to Jule Dabars.) 314 315 Changes to past and future timestamps 316 317 Vostok, Antarctica changed to +05 on 2023-12-18. It had been at 318 +07 (not +06) for years. (Thanks to Zakhary V. Akulov.) 319 320 Change data for Casey, Antarctica to agree with timeanddate.com, 321 by adding five time zone changes since 2020. Casey is now at +08 322 instead of +11. 323 324 Changes to past tm_isdst flags 325 326 Much of Greenland, represented by America/Nuuk, changed its 327 standard time from -03 to -02 on 2023-03-25, not on 2023-10-28. 328 This does not affect UTC offsets, only the tm_isdst flag. 329 (Thanks to Thomas M. Steenholdt.) 330 331 New data file 332 333 A new data file zonenow.tab helps configure applications that use 334 timestamps dated from now on. This simplifies configuration, 335 since users choose from a smaller Zone set. The file's format is 336 experimental and subject to change. 337 338 Changes to code 339 340 localtime.c no longer mishandles TZif files that contain a single 341 transition into a DST regime. Previously, it incorrectly assumed 342 DST was in effect before the transition too. (Thanks to Alois 343 Treindl for debugging help.) 344 345 localtime.c's timeoff no longer collides with OpenBSD 7.4. 346 347 The C code now uses _Generic only if __STDC_VERSION__ says the 348 compiler is C11 or later. 349 350 tzselect now optionally reads zonenow.tab, to simplify when 351 configuring only for timestamps dated from now on. 352 353 tzselect no longer creates temporary files. 354 355 tzselect no longer mishandles the following: 356 357 Spaces and most other special characters in BUGEMAIL, PACKAGE, 358 TZDIR, and VERSION. 359 360 TZ strings when using mawk 1.4.3, which mishandles regular 361 expressions of the form /X{2,}/. 362 363 ISO 6709 coordinates when using an awk that lacks the GNU 364 extension of newlines in -v option-arguments. 365 366 Non UTF-8 locales when using an iconv command that lacks the GNU 367 //TRANSLIT extension. 368 369 zic no longer mishandles data for Palestine after the year 2075. 370 Previously, it incorrectly omitted post-2075 transitions that are 371 predicted for just before and just after Ramadan. (Thanks to Ken 372 Murchison for debugging help.) 373 374 zic now works again on Linux 2.6.16 and 2.6.17 (2006). 375 (Problem reported by Rune Torgersen.) 376 377 Changes to build procedure 378 379 The Makefile is now more compatible with POSIX: 380 * It no longer defines AR, CC, CFLAGS, LDFLAGS, and SHELL. 381 * It no longer uses its own 'cc' in place of CC. 382 * It now uses ARFLAGS, with default specified by POSIX. 383 * It does not use LFLAGS incompatibly with POSIX. 384 * It uses the special .POSIX target. 385 * It quotes special characters more carefully. 386 * It no longer mishandles builds in an ISO 8859 locale. 387 Due to the CC changes, TZDIR is now #defined in a file tzdir.h 388 built by 'make', not in a $(CC) -D option. Also, TZDEFAULT is 389 now treated like TZDIR as they have similar roles. 390 391 Changes to commentary 392 393 Limitations and hazards of the optional support for obsolescent 394 C89 platforms are documented better, along with a tentative 395 schedule for removing this support. 396 397 398Release 2023c - 2023-03-28 12:42:14 -0700 399 400 Changes to past and future timestamps 401 402 Model Lebanon's DST chaos by reverting data to tzdb 2023a. 403 (Thanks to Rany Hany for the heads-up.) 404 405 406Release 2023b - 2023-03-23 19:50:38 -0700 407 408 Changes to future timestamps 409 410 This year Lebanon springs forward April 20/21 not March 25/26. 411 (Thanks to Saadallah Itani.) [This was reverted in 2023c.] 412 413 414Release 2023a - 2023-03-22 12:39:33 -0700 415 416 Briefly: 417 Egypt now uses DST again, from April through October. 418 This year Morocco springs forward April 23, not April 30. 419 Palestine delays the start of DST this year. 420 Much of Greenland still uses DST from 2024 on. 421 America/Yellowknife now links to America/Edmonton. 422 tzselect can now use current time to help infer timezone. 423 The code now defaults to C99 or later. 424 Fix use of C23 attributes. 425 426 Changes to future timestamps 427 428 Starting in 2023, Egypt will observe DST from April's last Friday 429 through October's last Thursday. (Thanks to Ahmad ElDardiry.) 430 Assume the transition times are 00:00 and 24:00, respectively. 431 432 In 2023 Morocco's spring-forward transition after Ramadan 433 will occur April 23, not April 30. (Thanks to Milamber.) 434 Adjust predictions for future years accordingly. This affects 435 predictions for 2023, 2031, 2038, and later years. 436 437 This year Palestine will delay its spring forward from 438 March 25 to April 29 due to Ramadan. (Thanks to Heba Hamad.) 439 Make guesses for future Ramadans too. 440 441 Much of Greenland, represented by America/Nuuk, will continue to 442 observe DST using European Union rules. When combined with 443 Greenland's decision not to change the clocks in fall 2023, 444 America/Nuuk therefore changes from -03/-02 to -02/-01 effective 445 2023-10-29 at 01:00 UTC. (Thanks to Thomas M. Steenholdt.) 446 This change from 2022g doesn't affect timestamps until 2024-03-30, 447 and doesn't affect tm_isdst until 2023-03-25. 448 449 Changes to past timestamps 450 451 America/Yellowknife has changed from a Zone to a backward 452 compatibility Link, as it no longer differs from America/Edmonton 453 since 1970. (Thanks to Almaz Mingaleev.) This affects some 454 pre-1948 timestamps. The old data are now in 'backzone'. 455 456 Changes to past time zone abbreviations 457 458 When observing Moscow time, Europe/Kirov and Europe/Volgograd now 459 use the abbreviations MSK/MSD instead of numeric abbreviations, 460 for consistency with other timezones observing Moscow time. 461 462 Changes to code 463 464 You can now tell tzselect local time, to simplify later choices. 465 Select the 'time' option in its first prompt. 466 467 You can now compile with -DTZNAME_MAXIMUM=N to limit time zone 468 abbreviations to N bytes (default 255). The reference runtime 469 library now rejects POSIX-style TZ strings that contain longer 470 abbreviations, treating them as UTC. Previously the limit was 471 platform dependent and abbreviations were silently truncated to 472 16 bytes even when the limit was greater than 16. 473 474 The code by default is now designed for C99 or later. To build on 475 a mostly-C89 platform, compile with -DPORT_TO_C89; this should 476 work on C89 platforms that also support C99 'long long' and 477 perhaps a few other extensions to C89. To support C89 callers of 478 tzcode's library, compile with -DSUPPORT_C89; however, this could 479 trigger latent bugs in C99-or-later callers. The two new macros 480 are transitional aids planned to be removed in a future version 481 (say, in 2029), when C99 or later will be required. 482 483 The code now builds again on pre-C99 platforms, if you compile 484 with -DPORT_TO_C89. This fixes a bug introduced in 2022f. 485 486 On C23-compatible platforms tzcode no longer uses syntax like 487 'static [[noreturn]] void usage(void);'. Instead, it uses 488 '[[noreturn]] static void usage(void);' as strict C23 requires. 489 (Problem reported by Houge Langley.) 490 491 The code's functions now constrain their arguments with the C 492 'restrict' keyword consistently with their documentation. 493 This may allow future optimizations. 494 495 zdump again builds standalone with ckdadd and without setenv, 496 fixing a bug introduced in 2022g. (Problem reported by panic.) 497 498 leapseconds.awk can now process a leap seconds file that never 499 expires; this might be useful if leap seconds are discontinued. 500 501 Changes to commentary 502 503 tz-link.html has a new section "Coordinating with governments and 504 distributors". (Thanks to Neil Fuller for some of the text.) 505 506 To improve tzselect diagnostics, zone1970.tab's comments column is 507 now limited to countries that have multiple timezones. 508 509 Note that there are plans to discontinue leap seconds by 2035. 510 511 512Release 2022g - 2022-11-29 08:58:31 -0800 513 514 Briefly: 515 The northern edge of Chihuahua changes to US timekeeping. 516 Much of Greenland stops changing clocks after March 2023. 517 Fix some pre-1996 timestamps in northern Canada. 518 C89 is now deprecated; please use C99 or later. 519 Portability fixes for AIX, libintl, MS-Windows, musl, z/OS 520 In C code, use more C23 features if available. 521 C23 timegm now supported by default 522 Fixes for unlikely integer overflows 523 524 Changes to future timestamps 525 526 In the Mexican state of Chihuahua, the border strip near the US 527 will change to agree with nearby US locations on 2022-11-30. 528 The strip's western part, represented by Ciudad Juárez, switches 529 from -06 all year to -07/-06 with US DST rules, like El Paso, TX. 530 The eastern part, represented by Ojinaga, will observe US DST next 531 year, like Presidio, TX. (Thanks to Heitor David Pinto.) 532 A new Zone America/Ciudad_Juarez splits from America/Ojinaga. 533 534 Much of Greenland, represented by America/Nuuk, stops observing 535 winter time after March 2023, so its daylight saving time becomes 536 standard time. (Thanks to Jonas Nyrup and Jürgen Appel.) 537 538 Changes to past timestamps 539 540 Changes for pre-1996 northern Canada (thanks to Chris Walton): 541 542 Merge America/Iqaluit and America/Pangnirtung into the former, 543 with a backward compatibility link for the latter name. 544 There is no good evidence the two locations differ since 1970. 545 This change affects pre-1996 America/Pangnirtung timestamps. 546 547 Cambridge Bay, Inuvik, Iqaluit, Rankin Inlet, Resolute and 548 Yellowknife did not observe DST in 1965, and did observe DST 549 from 1972 through 1979. 550 551 Whitehorse moved from -09 to -08 on 1966-02-27, not 1967-05-28. 552 553 Colombia's 1993 fallback was 02-06 24:00, not 04-04 00:00. 554 (Thanks to Alois Treindl.) 555 556 Singapore's 1981-12-31 change was at 16:00 UTC (23:30 local time), 557 not 24:00 local time. (Thanks to Geoff Clare via Robert Elz.) 558 559 Changes to code 560 561 Although tzcode still works with C89, bugs found in recent routine 562 maintenance indicate that bitrot has set in and that in practice 563 C89 is no longer used to build tzcode. As it is a maintenance 564 burden, support for C89 is planned to be removed soon. Instead, 565 please use compilers compatible with C99, C11, C17, or C23. 566 567 timegm, which tzcode implemented in 1989, will finally be 568 standardized 34 years later as part of C23, so timegm is now 569 supported even if STD_INSPIRED is not defined. 570 571 Fix bug in zdump's tzalloc emulation on hosts that lack tm_zone. 572 (Problem reported by Đoàn Trần Công Danh.) 573 574 Fix bug in zic on hosts where malloc(0) yields NULL on success. 575 (Problem reported by Tim McBrayer for AIX 6.1.) 576 577 Fix zic configuration to avoid linkage failures on some platforms. 578 (Problems reported by Gilmore Davidson and Igor Ivanov.) 579 580 Work around MS-Windows nmake incompatibility with POSIX. 581 (Problem reported by Manuela Friedrich.) 582 583 Port mktime and strftime to debugging platforms where accessing 584 uninitialized data has undefined behavior (strftime problem 585 reported by Robert Elz). 586 587 Check more carefully for unlikely integer overflows, preferring 588 C23 <stdckdint.h> to overflow checking by hand, as the latter has 589 had obscure bugs. 590 591 Changes to build procedure 592 593 New Makefile rule check_mild that skips checking whether Link 594 lines are in the file 'backward'. (Inspired by a suggestion from 595 Stephen Colebourne.) 596 597 598Release 2022f - 2022-10-28 18:04:57 -0700 599 600 Briefly: 601 Mexico will no longer observe DST except near the US border. 602 Chihuahua moves to year-round -06 on 2022-10-30. 603 Fiji no longer observes DST. 604 Move links to 'backward'. 605 In vanguard form, GMT is now a Zone and Etc/GMT a link. 606 zic now supports links to links, and vanguard form uses this. 607 Simplify four Ontario zones. 608 Fix a Y2438 bug when reading TZif data. 609 Enable 64-bit time_t on 32-bit glibc platforms. 610 Omit large-file support when no longer needed. 611 In C code, use some C23 features if available. 612 Remove no-longer-needed workaround for Qt bug 53071. 613 614 Changes to future timestamps 615 616 Mexico will no longer observe DST after 2022, except for areas 617 near the US border that continue to observe US DST rules. 618 On 2022-10-30 at 02:00 the Mexican state of Chihuahua moves 619 from -07 (-06 with DST) to year-round -06, thus not changing 620 its clocks that day. The new law states that Chihuahua 621 near the US border no longer observes US DST. 622 (Thanks to gera for the heads-up about Chihuahua.) 623 624 Fiji will not observe DST in 2022/3. (Thanks to Shalvin Narayan.) 625 For now, assume DST is suspended indefinitely. 626 627 Changes to data 628 629 Move links to 'backward' to ease and simplify link maintenance. 630 This affects generated data only if you use 'make BACKWARD='. 631 632 GMT is now a Zone and Etc/GMT a link instead of vice versa, 633 as GMT is needed for leap second support whereas Etc/GMT is not. 634 However, this change exposes a bug in TZUpdater 2.3.2 so it is 635 present only in vanguard form for now. 636 637 Vanguard form now uses links to links, as zic now supports this. 638 639 Changes to past timestamps 640 641 Simplify four Ontario zones, as most of the post-1970 differences 642 seem to have been imaginary. (Problem reported by Chris Walton.) 643 Move America/Nipigon, America/Rainy_River, and America/Thunder_Bay 644 to 'backzone'; backward-compatibility links still work, albeit 645 with some different timestamps before November 2005. 646 647 Changes to code 648 649 zic now supports links to links regardless of input line order. 650 For example, if Australia/Sydney is a Zone, the lines 651 Link Australia/Canberra Australia/ACT 652 Link Australia/Sydney Australia/Canberra 653 now work correctly, even though the shell commands 654 ln Australia/Canberra Australia/ACT 655 ln Australia/Sydney Australia/Canberra 656 would fail because the first command attempts to use a link 657 Australia/Canberra that does not exist until after the second 658 command is executed. Previously, zic had unspecified behavior if 659 a Link line's target was another link, and zic often misbehaved if 660 a Link line's target was a later Link line. 661 662 Fix line number in zic's diagnostic for a link to a link. 663 664 Fix a bug that caused localtime to mishandle timestamps starting 665 in the year 2438 when reading data generated by 'zic -b fat' when 666 distant-future DST transitions occur at times given in standard 667 time or in UT, not the usual case of local time. This occurs when 668 the corresponding .zi Rule lines specify DST transitions with TO 669 columns of 'max' and AT columns that end in 's' or 'u'. The 670 number 2438 comes from the 32-bit limit in the year 2038, plus the 671 400-year Gregorian cycle. (Problem reported by Bradley White.) 672 673 On glibc 2.34 and later, which optionally supports 64-bit time_t 674 on platforms like x86 where time_t was traditionally 32 bits, 675 default time_t to 64 instead of 32 bits. This lets functions like 676 localtime support timestamps after the year 2038, and fixes 677 year-2038 problems in zic when accessing files dated after 2038. 678 To continue to limit time_t to 32 bits on these platforms, use 679 "make CFLAGS='-D_TIME_BITS=32'". 680 681 In C code, do not enable large-file support on platforms like AIX 682 and macOS that no longer need it now that tzcode does not use 683 off_t or related functions like 'stat'. Large-file support is 684 still enabled by default on GNU/Linux, as it is needed for 64-bit 685 time_t support. 686 687 In C code, prefer C23 keywords to pre-C23 macros for alignof, 688 bool, false, and true. Also, use the following C23 features if 689 available: __has_include, unreachable. 690 691 zic no longer works around Qt bug 53071, as the relevant Qt 692 releases have been out of support since 2019. This change affects 693 only fat TZif files, as thin files never had the workaround. 694 695 zdump no longer modifies the environ vector when compiled on 696 platforms lacking tm_zone or when compiled with -DUSE_LTZ=0. 697 This avoid undefined behavior on POSIX platforms. 698 699 700Release 2022e - 2022-10-11 11:13:02 -0700 701 702 Briefly: 703 Jordan and Syria switch from +02/+03 with DST to year-round +03. 704 705 Changes to future timestamps 706 707 Jordan and Syria are abandoning the DST regime and are changing to 708 permanent +03, so they will not fall back from +03 to +02 on 709 2022-10-28. (Thanks to Steffen Thorsen and Issam Al-Zuwairi.) 710 711 Changes to past timestamps 712 713 On 1922-01-01 Tijuana adopted standard time at 00:00, not 01:00. 714 715 Changes to past time zone abbreviations and DST flags 716 717 The temporary advancement of clocks in central Mexico in summer 718 1931 is now treated as daylight saving time, instead of as two 719 changes to standard time. 720 721 722Release 2022d - 2022-09-23 12:02:57 -0700 723 724 Briefly: 725 Palestine transitions are now Saturdays at 02:00. 726 Simplify three Ukraine zones into one. 727 728 Changes to future timestamps 729 730 Palestine now springs forward and falls back at 02:00 on the 731 first Saturday on or after March 24 and October 24, respectively. 732 This means 2022 falls back 10-29 at 02:00, not 10-28 at 01:00. 733 (Thanks to Heba Hamad.) 734 735 Changes to past timestamps 736 737 Simplify three Ukraine zones to one, since the post-1970 738 differences seem to have been imaginary. Move Europe/Uzhgorod and 739 Europe/Zaporozhye to 'backzone'; backward-compatibility links 740 still work, albeit with different timestamps before October 1991. 741 742 743Release 2022c - 2022-08-15 17:47:18 -0700 744 745 Briefly: 746 Work around awk bug in FreeBSD, macOS, etc. 747 Improve tzselect on intercontinental Zones. 748 749 Changes to code 750 751 Work around a bug in onetrueawk that broke commands like 752 'make traditional_tarballs' on FreeBSD, macOS, etc. 753 (Problem reported by Deborah Goldsmith.) 754 755 Add code to tzselect that uses experimental structured comments in 756 zone1970.tab to clarify whether Zones like Africa/Abidjan and 757 Europe/Istanbul cross continent or ocean boundaries. 758 (Inspired by a problem reported by Peter Krefting.) 759 760 Fix bug with 'zic -d /a/b/c' when /a is unwritable but the 761 directory /a/b already exists. 762 763 Remove zoneinfo2tdf.pl, as it was unused and triggered false 764 malware alarms on some email servers. 765 766 767Release 2022b - 2022-08-10 15:38:32 -0700 768 769 Briefly: 770 Chile's DST is delayed by a week in September 2022. 771 Iran no longer observes DST after 2022. 772 Rename Europe/Kiev to Europe/Kyiv. 773 New zic -R option 774 Vanguard form now uses %z. 775 Finish moving duplicate-since-1970 zones to 'backzone'. 776 New build option PACKRATLIST 777 New tailored_tarballs target, replacing rearguard_tarballs 778 779 Changes to future timestamps 780 781 Chile's 2022 DST start is delayed from September 4 to September 11. 782 (Thanks to Juan Correa.) 783 784 Iran plans to stop observing DST permanently, after it falls back 785 on 2022-09-21. (Thanks to Ali Mirjamali.) 786 787 Changes to past timestamps 788 789 Finish moving to 'backzone' the location-based zones whose 790 timestamps since 1970 are duplicates; adjust links accordingly. 791 This change ordinarily affects only pre-1970 timestamps, and with 792 the new PACKRATLIST option it does not affect any timestamps. 793 In this round the affected zones are Antarctica/Vostok, 794 Asia/Brunei, Asia/Kuala_Lumpur, Atlantic/Reykjavik, 795 Europe/Amsterdam, Europe/Copenhagen, Europe/Luxembourg, 796 Europe/Monaco, Europe/Oslo, Europe/Stockholm, Indian/Christmas, 797 Indian/Cocos, Indian/Kerguelen, Indian/Mahe, Indian/Reunion, 798 Pacific/Chuuk, Pacific/Funafuti, Pacific/Majuro, Pacific/Pohnpei, 799 Pacific/Wake and Pacific/Wallis, and the affected links are 800 Arctic/Longyearbyen, Atlantic/Jan_Mayen, Iceland, Pacific/Ponape, 801 Pacific/Truk, and Pacific/Yap. 802 803 From fall 1994 through fall 1995, Shanks wrote that Crimea's 804 DST transitions were at 02:00 standard time, not at 00:00. 805 (Thanks to Michael Deckers.) 806 807 Iran adopted standard time in 1935, not 1946. In 1977 it observed 808 DST from 03-21 23:00 to 10-20 24:00; its 1978 transitions were on 809 03-24 and 08-05, not 03-20 and 10-20; and its spring 1979 810 transition was on 05-27, not 03-21. 811 (Thanks to Roozbeh Pournader and Francis Santoni.) 812 813 Chile's observance of -04 from 1946-08-29 through 1947-03-31 was 814 considered DST, not standard time. Santiago and environs had moved 815 their clocks back to rejoin the rest of mainland Chile; put this 816 change at the end of 1946-08-28. (Thanks to Michael Deckers.) 817 818 Some old, small clock transitions have been removed, as people at 819 the time did not change their clocks. This affects Asia/Hong_Kong 820 in 1904, Asia/Ho_Chi_Minh in 1906, and Europe/Dublin in 1880. 821 822 Changes to zone name 823 824 Rename Europe/Kiev to Europe/Kyiv, as "Kyiv" is more common in 825 English now. Spelling of other names in Ukraine has not yet 826 demonstrably changed in common English practice so for now these 827 names retain old spellings, as in other countries (e.g., 828 Europe/Prague not "Praha", and Europe/Sofia not "Sofiya"). 829 830 Changes to code 831 832 zic has a new option '-R @N' to output explicit transitions < N. 833 (Need suggested by Almaz Mingaleev.) 834 835 'zic -r @N' no longer outputs bad data when N < first transition. 836 (Problem introduced in 2021d and reported by Peter Krefting.) 837 838 zic now checks its input for NUL bytes and unterminated lines, and 839 now supports input line lengths up to 2048 (not 512) bytes. 840 841 gmtime and related code now use the abbreviation "UTC" not "GMT". 842 POSIX is being revised to require this. 843 844 When tzset and related functions set vestigial static variables 845 like tzname, they now prefer specified timestamps to unspecified ones. 846 (Problem reported by Almaz Mingaleev.) 847 848 zic no longer complains "can't determine time zone abbreviation to 849 use just after until time" when a transition to a new standard 850 time occurs simultaneously with the first DST fallback transition. 851 852 Changes to build procedure 853 854 Source data in vanguard form now uses the %z notation, introduced 855 in release 2015f. For example, for America/Sao_Paulo vanguard 856 form contains the zone continuation line "-3:00 Brazil %z", which 857 is simpler and more reliable than the line "-3:00 Brazil -03/-02" 858 used in main and rearguard forms. The plan is for the main form 859 to use %z eventually; in the meantime maintainers of zi parsers 860 are encouraged to test the parsers on vanguard.zi. 861 862 The Makefile has a new PACKRATLIST option to select a subset of 863 'backzone'. For example, 'make PACKRATDATA=backzone 864 PACKRATLIST=zone.tab' now generates TZif files identical to those 865 of the global-tz project. 866 867 The Makefile has a new tailored_tarballs target for generating 868 special-purpose tarballs. It generalizes and replaces the 869 rearguard_tarballs target and related targets and macros, which 870 are now obsolescent. 871 872 'make install' now defaults LOCALTIME to Factory not GMT, 873 which means the default abbreviation is now "-00" not "GMT". 874 875 Remove the posix_packrat target, marked obsolescent in 2016a. 876 877 878Release 2022a - 2022-03-15 23:02:01 -0700 879 880 Briefly: 881 Palestine will spring forward on 2022-03-27, not -03-26. 882 zdump -v now outputs better failure indications. 883 Bug fixes for code that reads corrupted TZif data. 884 885 Changes to future timestamps 886 887 Palestine will spring forward on 2022-03-27, not 2022-03-26. 888 (Thanks to Heba Hamad.) Predict future transitions for first 889 Sunday >= March 25. Additionally, predict fallbacks to be the first 890 Friday on or after October 23, not October's last Friday, to be more 891 consistent with recent practice. The first differing fallback 892 prediction is on 2025-10-24, not 2025-10-31. 893 894 Changes to past timestamps 895 896 From 1992 through spring 1996, Ukraine's DST transitions were at 897 02:00 standard time, not at 01:00 UTC. (Thanks to Alois Treindl.) 898 899 Chile's Santiago Mean Time and its LMT precursor have been adjusted 900 eastward by 1 second to align with past and present law. 901 902 Changes to commentary 903 904 Add several references for Chile's 1946/1947 transitions, some of 905 which only affected portions of the country. 906 907 Changes to code 908 909 Fix bug when mktime gets confused by truncated TZif files with 910 unspecified local time. (Problem reported by Almaz Mingaleev.) 911 912 Fix bug when 32-bit time_t code reads malformed 64-bit TZif data. 913 (Problem reported by Christos Zoulas.) 914 915 When reading a version 2 or later TZif file, the TZif reader now 916 validates the version 1 header and data block only enough to skip 917 over them, as recommended by RFC 8536 section 4. Also, the TZif 918 reader no longer mistakenly attempts to parse a version 1 TZIf 919 file header as a TZ string. 920 921 zdump -v now outputs "(localtime failed)" and "(gmtime failed)" 922 when local time and UT cannot be determined for a timestamp. 923 924 Changes to build procedure 925 926 Distribution tarballs now use standard POSIX.1-1988 ustar format 927 instead of GNU format. Although the formats are almost identical 928 for these tarballs, ustar headers' magic fields contain "ustar" 929 instead of "ustar ", and their version fields contain "00" instead 930 of " ". The two formats are planned to diverge more significantly 931 for tzdb releases after 2242-03-16 12:56:31 UTC, when the ustar 932 format becomes obsolete and the tarballs switch to pax format, an 933 extension of ustar. For details about these formats, please see 934 "pax - portable archive interchange", IEEE Std 1003.1-2017, 935 <https://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13>. 936 937 938Release 2021e - 2021-10-21 18:41:00 -0700 939 940 Changes to future timestamps 941 942 Palestine will fall back 10-29 (not 10-30) at 01:00. 943 (Thanks to P Chan and Heba Hemad.) 944 945 946Release 2021d - 2021-10-15 13:48:18 -0700 947 948 Briefly: 949 Fiji suspends DST for the 2021/2022 season. 950 'zic -r' marks unspecified timestamps with "-00". 951 952 Changes to future timestamps 953 954 Fiji will suspend observance of DST for the 2021/2022 season. 955 Assume for now that it will return next year. (Thanks to Jashneel 956 Kumar and P Chan.) 957 958 Changes to code 959 960 'zic -r' now uses "-00" time zone abbreviations for intervals 961 with UT offsets that are unspecified due to -r truncation. 962 This implements a change in draft Internet RFC 8536bis. 963 964 965Release 2021c - 2021-10-01 14:21:49 -0700 966 967 Briefly: 968 Revert most 2021b changes to 'backward'. 969 Fix 'zic -b fat' bug in pre-1970 32-bit data. 970 Fix two Link line typos. 971 Distribute SECURITY file. 972 973 This release is intended as a bugfix release, to fix compatibility 974 problems and typos reported since 2021b was released. 975 976 Changes to Link directives 977 978 Revert almost all of 2021b's changes to the 'backward' file, 979 by moving Link directives back to where they were in 2021a. 980 Although 'zic' doesn't care which source file contains a Link 981 directive, some downstream uses ran into trouble with the move. 982 (Problem reported by Stephen Colebourne for Joda-Time.) 983 984 Fix typo that linked Atlantic/Jan_Mayen to the wrong location 985 (problem reported by Chris Walton). 986 987 Fix 'backzone' typo that linked America/Virgin to the wrong 988 location (problem reported by Michael Deckers). 989 990 Changes to code 991 992 Fix a bug in 'zic -b fat' that caused old timestamps to be 993 mishandled in 32-bit-only readers (problem reported by Daniel 994 Fischer). 995 996 Changes to documentation 997 998 Distribute the SECURITY file (problem reported by Andreas Radke). 999 1000 1001Release 2021b - 2021-09-24 16:23:00 -0700 1002 1003 Briefly: 1004 Jordan now starts DST on February's last Thursday. 1005 Samoa no longer observes DST. 1006 Merge more location-based Zones whose timestamps agree since 1970. 1007 Move some backward-compatibility links to 'backward'. 1008 Rename Pacific/Enderbury to Pacific/Kanton. 1009 Correct many pre-1993 transitions in Malawi, Portugal, etc. 1010 zic now creates each output file or link atomically. 1011 zic -L no longer omits the POSIX TZ string in its output. 1012 zic fixes for truncation and leap second table expiration. 1013 zic now follows POSIX for TZ strings using all-year DST. 1014 Fix some localtime crashes and bugs in obscure cases. 1015 zdump -v now outputs more-useful boundary cases. 1016 tzfile.5 better matches a draft successor to RFC 8536. 1017 A new file SECURITY. 1018 1019 This release is prompted by recent announcements by Jordan and Samoa. 1020 It incorporates many other changes that had accumulated since 2021a. 1021 However, it omits most proposed changes that merged all Zones 1022 agreeing since 1970, as concerns were raised about doing too many of 1023 these changes at once. It does keeps some of these changes in the 1024 interest of making tzdb more equitable one step at a time; see 1025 "Merge more location-based Zones" below. 1026 1027 Changes to future timestamps 1028 1029 Jordan now starts DST on February's last Thursday. 1030 (Thanks to Steffen Thorsen.) 1031 1032 Samoa no longer observes DST. (Thanks to Geoffrey D. Bennett.) 1033 1034 Changes to zone name 1035 1036 Rename Pacific/Enderbury to Pacific/Kanton. When we added 1037 Enderbury in 1993, we did not know that it is uninhabited and that 1038 Kanton (population two dozen) is the only inhabited location in 1039 that timezone. The old name is now a backward-compatibility link. 1040 1041 Changes to past timestamps 1042 1043 Correct many pre-1993 transitions, fixing entries originally 1044 derived from Shanks, Whitman, and Mundell. The fixes include: 1045 - Barbados: standard time was introduced in 1911, not 1932; and 1046 DST was observed in 1942-1944 1047 - Cook Islands: In 1899 they switched from east to west of GMT, 1048 celebrating Christmas for two days. They (and Niue) switched 1049 to standard time in 1952, not 1901. 1050 - Guyana: corrected LMT for Georgetown; the introduction of 1051 standard time in 1911, not 1915; and corrections to 1975 and 1052 1992 transitions 1053 - Kanton: uninhabited before 1937-08-31 1054 - Niue: only observed -11:20 from 1952 through 1964, then went to 1055 -11 instead of -11:30 1056 - Portugal: DST was observed in 1950 1057 - Tonga: corrected LMT; the introduction of standard time in 1945, 1058 not 1901; and corrections to the transition from +12:20 to +13 1059 in 1961, not 1941 1060 Additional fixes to entries in the 'backzone' file include: 1061 - Enderbury: inhabited only 1860/1885 and 1938-03-06/1942-02-09 1062 - The Gambia: 1933 and 1942 transitions 1063 - Malawi: several 1911 through 1925 transitions 1064 - Sierra Leone: several 1913 through 1941 transitions, and DST 1065 was NOT observed in 1957 through 1962 1066 (Thanks to P Chan, Michael Deckers, Alexander Krivenyshev and 1067 Alois Treindl.) 1068 1069 Merge more location-based Zones whose timestamps agree since 1970, 1070 as pre-1970 timestamps are out of scope. This is part of a 1071 process that has been ongoing since 2013. This does not affect 1072 post-1970 timestamps, and timezone historians who build with 'make 1073 PACKRATDATA=backzone' should see no changes to pre-1970 timestamps. 1074 When merging, keep the most-populous location's data, and move 1075 data for other locations to 'backzone' with a backward 1076 link in 'backward'. For example, move America/Creston data to 1077 'backzone' with a link in 'backward' from America/Phoenix because 1078 the two timezones' timestamps agree since 1970; this change 1079 affects some pre-1968 timestamps in America/Creston because 1080 Creston and Phoenix disagreed before 1968. The affected Zones 1081 are Africa/Accra, America/Atikokan, America/Blanc-Sablon, 1082 America/Creston, America/Curacao, America/Nassau, 1083 America/Port_of_Spain, Antarctica/DumontDUrville, and 1084 Antarctica/Syowa. 1085 1086 Changes to maintenance procedure 1087 1088 The new file SECURITY covers how to report security-related bugs. 1089 1090 Several backward-compatibility links have been moved to the 1091 'backward' file. These links, which range from Africa/Addis_Ababa 1092 to Pacific/Saipan, are only for compatibility with now-obsolete 1093 guidelines suggesting an entry for every ISO 3166 code. 1094 The intercontinental convenience links Asia/Istanbul and 1095 Europe/Nicosia have also been moved to 'backward'. 1096 1097 Changes to code 1098 1099 zic now creates each output file or link atomically, 1100 possibly by creating a temporary file and then renaming it. 1101 This avoids races where a TZ setting would temporarily stop 1102 working while zic was installing a replacement file or link. 1103 1104 zic -L no longer omits the POSIX TZ string in its output. 1105 Starting with 2020a, zic -L truncated its output according to the 1106 "Expires" directive or "#expires" comment in the leapseconds file. 1107 The resulting TZif files omitted daylight saving transitions after 1108 the leap second table expired, which led to far less accurate 1109 predictions of times after the expiry. Although future timestamps 1110 cannot be converted accurately in the presence of leap seconds, it 1111 is more accurate to convert near-future timestamps with a few 1112 seconds error than with an hour error, so zic -L no longer 1113 truncates output in this way. 1114 1115 Instead, when zic -L is given the "Expires" directive, it now 1116 outputs the expiration by appending a no-change entry to the leap 1117 second table. Although this should work well with most TZif 1118 readers, it does not conform to Internet RFC 8536 and some pickier 1119 clients (including tzdb 2017c through 2021a) reject it, so 1120 "Expires" directives are currently disabled by default. To enable 1121 them, set the EXPIRES_LINE Makefile variable. If a TZif file uses 1122 this new feature it is marked with a new TZif version number 4, 1123 a format intended to be documented in a successor to RFC 8536. 1124 The old-format "#expires" comments are now treated solely as 1125 comments and have no effect on the TZif files. 1126 1127 zic -L LEAPFILE -r @LO no longer generates an invalid TZif file 1128 that omits leap second information for the range LO..B when LO 1129 falls between two leap seconds A and B. Instead, it generates a 1130 TZif version 4 file that represents the previously missing 1131 information. 1132 1133 The TZif reader now allows the leap second table to begin with a 1134 correction other than -1 or +1, and to contain adjacent 1135 transitions with equal corrections. This supports TZif version 4. 1136 1137 The TZif reader now lets leap seconds occur less than 28 days 1138 apart. This supports possible future TZif extensions. 1139 1140 Fix bug that caused 'localtime' etc. to crash when TZ was 1141 set to a all-year DST string like "EST5EDT4,0/0,J365/25" that does 1142 not conform to POSIX but does conform to Internet RFC 8536. 1143 1144 Fix another bug that caused 'localtime' etc. to crash when TZ was 1145 set to a POSIX-conforming but unusual TZ string like 1146 "EST5EDT4,0/0,J365/0", where almost all the year is DST. 1147 1148 Fix yet another bug that caused 'localtime' etc. to mishandle slim 1149 TZif files containing leap seconds after the last explicit 1150 transition in the table, or when handling far-future timestamps 1151 in slim TZif files lacking leap seconds. 1152 1153 Fix localtime misbehavior involving positive leap seconds. 1154 This change affects only behavior for "right" system time, 1155 which contains leap seconds, and only if the UT offset is 1156 not a multiple of 60 seconds when a positive leap second occurs. 1157 (No such timezone exists in tzdb, luckily.) Without the fix, 1158 the timestamp was ambiguous during a positive leap second. 1159 With the fix, any seconds occurring after a positive leap second 1160 and within the same localtime minute are counted through 60, not 1161 through 59; their UT offset (tm_gmtoff) is the same as before. 1162 Here is how the fix affects timestamps in a timezone with UT 1163 offset +01:23:45 (5025 seconds) and with a positive leap second at 1164 1972-06-30 23:59:60 UTC (78796800): 1165 1166 time_t without the fix with the fix 1167 78796800 1972-07-01 01:23:45 1972-07-01 01:23:45 (leap second) 1168 78796801 1972-07-01 01:23:45 1972-07-01 01:23:46 1169 ... 1170 78796815 1972-07-01 01:23:59 1972-07-01 01:23:60 1171 78796816 1972-07-01 01:24:00 1972-07-01 01:24:00 1172 1173 Fix an unlikely bug that caused 'localtime' etc. to misbehave if 1174 civil time changes a few seconds before time_t wraps around, when 1175 leap seconds are enabled. 1176 1177 Fix bug in zic -r; in some cases, the dummy time type after the 1178 last time transition disagreed with the TZ string, contrary to 1179 Internet RFC 8563 section 3.3. 1180 1181 Fix a bug with 'zic -r @X' when X is a negative leap second that 1182 has a nonnegative correction. Without the fix, the output file 1183 was truncated so that X appeared to be a positive leap second. 1184 Fix a similar, even less likely bug when truncating at a positive 1185 leap second that has a nonpositive correction. 1186 1187 zic -r now reports an error if given rolling leap seconds, as this 1188 usage has never generally worked and is evidently unused. 1189 1190 zic now generates a POSIX-conforming TZ string for TZif files 1191 where all-year DST is predicted for the indefinite future. 1192 For example, for all-year Eastern Daylight Time, zic now generates 1193 "XXX3EDT4,0/0,J365/23" where it previously generated 1194 "EST5EDT,0/0,J365/25" or "". (Thanks to Michael Deckers for 1195 noting the possibility of POSIX conformance.) 1196 1197 zic.c no longer requires sys/wait.h (thanks to spazmodius for 1198 noting it wasn't needed). 1199 1200 When reading slim TZif files, zdump no longer mishandles leap 1201 seconds on the rare platforms where time_t counts leap seconds, 1202 fixing a bug introduced in 2014g. 1203 1204 zdump -v now outputs timestamps at boundaries of what localtime 1205 and gmtime can represent, instead of the less useful timestamps 1206 one day after the minimum and one day before the maximum. 1207 (Thanks to Arthur David Olson for prototype code, and to Manuela 1208 Friedrich for debugging help.) 1209 1210 zdump's -c and -t options are now consistently inclusive for the 1211 lower time bound and exclusive for the upper. Formerly they were 1212 inconsistent. (Confusion noted by Martin Burnicki.) 1213 1214 Changes to build procedure 1215 1216 You can now compile with -DHAVE_MALLOC_ERRNO=0 to port to 1217 non-POSIX hosts where malloc doesn't set errno. 1218 (Problem reported by Jan Engelhardt.) 1219 1220 Changes to documentation 1221 1222 tzfile.5 better matches a draft successor to RFC 8536 1223 <https://datatracker.ietf.org/doc/draft-murchison-rfc8536bis/01/>. 1224 1225 1226Release 2021a - 2021-01-24 10:54:57 -0800 1227 1228 Changes to future timestamps 1229 1230 South Sudan changes from +03 to +02 on 2021-02-01 at 00:00. 1231 (Thanks to Steffen Thorsen.) 1232 1233 1234Release 2020f - 2020-12-29 00:17:46 -0800 1235 1236 Change to build procedure 1237 1238 'make rearguard_tarballs' no longer generates a bad rearguard.zi, 1239 fixing a 2020e bug. (Problem reported by Deborah Goldsmith.) 1240 1241 1242Release 2020e - 2020-12-22 15:14:34 -0800 1243 1244 Briefly: 1245 Volgograd switches to Moscow time on 2020-12-27 at 02:00. 1246 1247 Changes to future timestamps 1248 1249 Volgograd changes time zone from +04 to +03 on 2020-12-27 at 02:00. 1250 (Thanks to Alexander Krivenyshev and Stepan Golosunov.) 1251 1252 Changes to past timestamps 1253 1254 Correct many pre-1986 transitions, fixing entries originally 1255 derived from Shanks. The fixes include: 1256 - Australia: several 1917 through 1971 transitions 1257 - The Bahamas: several 1941 through 1945 transitions 1258 - Bermuda: several 1917 through 1956 transitions 1259 - Belize: several 1942 through 1968 transitions 1260 - Ghana: several 1915 through 1956 transitions 1261 - Israel and Palestine: several 1940 through 1985 transitions 1262 - Kenya and adjacent: several 1908 through 1960 transitions 1263 - Nigeria and adjacent: correcting LMT in Lagos, and several 1905 1264 through 1919 transitions 1265 - Seychelles: the introduction of standard time in 1907, not 1906 1266 - Vanuatu: DST in 1973-1974, and a corrected 1984 transition 1267 (Thanks to P Chan.) 1268 1269 Because of the Australia change, Australia/Currie (King Island) is 1270 no longer needed, as it is identical to Australia/Hobart for all 1271 timestamps since 1970 and was therefore created by mistake. 1272 Australia/Currie has been moved to the 'backward' file and its 1273 corrected data moved to the 'backzone' file. 1274 1275 Changes to past time zone abbreviations and DST flags 1276 1277 To better match legislation in Turks and Caicos, the 2015 shift to 1278 year-round observance of -04 is now modeled as AST throughout before 1279 returning to Eastern Time with US DST in 2018, rather than as 1280 maintaining EDT until 2015-11-01. (Thanks to P Chan.) 1281 1282 Changes to documentation 1283 1284 The zic man page now documents zic's coalescing of transitions 1285 when a zone falls back just before DST springs forward. 1286 1287 1288Release 2020d - 2020-10-21 11:24:13 -0700 1289 1290 Briefly: 1291 Palestine ends DST earlier than predicted, on 2020-10-24. 1292 1293 Changes to past and future timestamps 1294 1295 Palestine ends DST on 2020-10-24 at 01:00, instead of 2020-10-31 1296 as previously predicted (thanks to Sharef Mustafa.) Its 1297 2019-10-26 fall-back was at 00:00, not 01:00 (thanks to Steffen 1298 Thorsen.) Its 2015-10-23 transition was at 01:00 not 00:00, and 1299 its spring 2020 transition was on March 28 at 00:00, not March 27 1300 (thanks to Pierre Cashon.) This affects Asia/Gaza and 1301 Asia/Hebron. Assume future spring and fall transitions will be on 1302 the Saturday preceding the last Sunday of March and October, 1303 respectively. 1304 1305 1306Release 2020c - 2020-10-16 11:15:53 -0700 1307 1308 Briefly: 1309 Fiji starts DST later than usual, on 2020-12-20. 1310 1311 Changes to future timestamps 1312 1313 Fiji will start DST on 2020-12-20, instead of 2020-11-08 as 1314 previously predicted. DST will still end on 2021-01-17. 1315 (Thanks to Raymond Kumar and Alan Mintz.) Assume for now that 1316 the later-than-usual start date is a one-time departure from the 1317 recent pattern. 1318 1319 Changes to build procedure 1320 1321 Rearguard tarballs now contain an empty file pacificnew. 1322 Some older downstream software expects this file to exist. 1323 (Problem reported by Mike Cullinan.) 1324 1325 1326Release 2020b - 2020-10-06 18:35:04 -0700 1327 1328 Briefly: 1329 Revised predictions for Morocco's changes starting in 2023. 1330 Canada's Yukon changes to -07 on 2020-11-01, not 2020-03-08. 1331 Macquarie Island has stayed in sync with Tasmania since 2011. 1332 Casey, Antarctica is at +08 in winter and +11 in summer. 1333 zic no longer supports -y, nor the TYPE field of Rules. 1334 1335 Changes to future timestamps 1336 1337 Morocco's spring-forward after Ramadan is now predicted to occur 1338 no sooner than two days after Ramadan, instead of one day. 1339 (Thanks to Milamber.) The first altered prediction is for 2023, 1340 now predicted to spring-forward on April 30 instead of April 23. 1341 1342 Changes to past and future timestamps 1343 1344 Casey Station, Antarctica has been using +08 in winter and +11 in 1345 summer since 2018. The most recent transition from +08 to +11 was 1346 2020-10-04 00:01. Also, Macquarie Island has been staying in 1347 sync with Tasmania since 2011. (Thanks to Steffen Thorsen.) 1348 1349 Changes to past and future time zone abbreviations and DST flags 1350 1351 Canada's Yukon, represented by America/Whitehorse and 1352 America/Dawson, changes its time zone rules from -08/-07 to 1353 permanent -07 on 2020-11-01, not on 2020-03-08 as 2020a had it. 1354 This change affects only the time zone abbreviation (MST vs PDT) 1355 and daylight saving flag for the period between the two dates. 1356 (Thanks to Andrew G. Smith.) 1357 1358 Changes to past timestamps 1359 1360 Correct several transitions for Hungary for 1918/1983. 1361 For example, the 1983-09-25 fall-back was at 01:00, not 03:00. 1362 (Thanks to Géza Nyáry.) Also, the 1890 transition to standard 1363 time was on 11-01, not 10-01 (thanks to Michael Deckers). 1364 1365 The 1891 French transition was on March 16, not March 15. The 1366 1911-03-11 French transition was at midnight, not a minute later. 1367 Monaco's transitions were on 1892-06-01 and 1911-03-29, not 1368 1891-03-15 and 1911-03-11. (Thanks to Michael Deckers.) 1369 1370 Changes to code 1371 1372 Support for zic's long-obsolete '-y YEARISTYPE' option has been 1373 removed and, with it, so has support for the TYPE field in Rule 1374 lines, which is now reserved for compatibility with earlier zic. 1375 These features were previously deprecated in release 2015f. 1376 (Thanks to Tim Parenti.) 1377 1378 zic now defaults to '-b slim' instead of to '-b fat'. 1379 1380 zic's new '-l -' and '-p -' options uninstall any existing 1381 localtime and posixrules files, respectively. 1382 1383 The undocumented and ineffective tzsetwall function has been 1384 removed. 1385 1386 Changes to build procedure 1387 1388 The Makefile now defaults POSIXRULES to '-', so the posixrules 1389 feature (obsolete as of 2019b) is no longer installed by default. 1390 1391 Changes to documentation and commentary 1392 1393 The long-obsolete files pacificnew, systemv, and yearistype.sh have 1394 been removed from the distribution. (Thanks to Tim Parenti.) 1395 1396 1397Release 2020a - 2020-04-23 16:03:47 -0700 1398 1399 Briefly: 1400 Morocco springs forward on 2020-05-31, not 2020-05-24. 1401 Canada's Yukon advanced to -07 year-round on 2020-03-08. 1402 America/Nuuk renamed from America/Godthab. 1403 zic now supports expiration dates for leap second lists. 1404 1405 Changes to future timestamps 1406 1407 Morocco's second spring-forward transition in 2020 will be May 31, 1408 not May 24 as predicted earlier. (Thanks to Semlali Naoufal.) 1409 Adjust future-year predictions to use the first Sunday after the 1410 day after Ramadan, not the first Sunday after Ramadan. 1411 1412 Canada's Yukon, represented by America/Whitehorse and 1413 America/Dawson, advanced to -07 year-round, beginning with its 1414 spring-forward transition on 2020-03-08, and will not fall back on 1415 2020-11-01. Although a government press release calls this 1416 "permanent Pacific Daylight Saving Time", we prefer MST for 1417 consistency with nearby Dawson Creek, Creston, and Fort Nelson. 1418 (Thanks to Tim Parenti.) 1419 1420 Changes to past timestamps 1421 1422 Shanghai observed DST in 1919. (Thanks to Phake Nick.) 1423 1424 Changes to timezone identifiers 1425 1426 To reflect current usage in English better, America/Godthab has 1427 been renamed to America/Nuuk. A backwards-compatibility link 1428 remains for the old name. 1429 1430 Changes to code 1431 1432 localtime.c no longer mishandles timestamps after the last 1433 transition in a TZif file with leap seconds and with daylight 1434 saving time transitions projected into the indefinite future. 1435 For example, with TZ='America/Los_Angeles' with leap seconds, 1436 zdump formerly reported a DST transition on 2038-03-14 1437 from 01:59:32.999... to 02:59:33 instead of the correct transition 1438 from 01:59:59.999... to 03:00:00. 1439 1440 zic -L now supports an Expires line in the leapseconds file, and 1441 truncates the TZif output accordingly. This propagates leap 1442 second expiration information into the TZif file, and avoids the 1443 abovementioned localtime.c bug as well as similar bugs present in 1444 many client implementations. If no Expires line is present, zic 1445 -L instead truncates the TZif output based on the #expires comment 1446 present in leapseconds files distributed by tzdb 2018f and later; 1447 however, this usage is obsolescent. For now, the distributed 1448 leapseconds file has an Expires line that is commented out, so 1449 that the file can be fed to older versions of zic which ignore the 1450 commented-out line. Future tzdb distributions are planned to 1451 contain a leapseconds file with an Expires line. 1452 1453 The configuration macros HAVE_TZNAME and USG_COMPAT should now be 1454 set to 1 if the system library supports the feature, and 2 if not. 1455 As before, these macros are nonzero if tzcode should support the 1456 feature, zero otherwise. 1457 1458 The configuration macro ALTZONE now has the same values with the 1459 same meaning as HAVE_TZNAME and USG_COMPAT. 1460 1461 The code's defense against CRLF in leap-seconds.list is now 1462 portable to POSIX awk. (Problem reported by Deborah Goldsmith.) 1463 1464 Although the undocumented tzsetwall function is not changed in 1465 this release, it is now deprecated in preparation for removal in 1466 future releases. Due to POSIX requirements, tzsetwall has not 1467 worked for some time. Any code that uses it should instead use 1468 tzalloc(NULL) or, if portability trumps thread-safety, should 1469 unset the TZ environment variable. 1470 1471 Changes to commentary 1472 1473 The Îles-de-la-Madeleine and the Listuguj reserve are noted as 1474 following America/Halifax, and comments about Yukon's "south" and 1475 "north" have been corrected to say "east" and "west". (Thanks to 1476 Jeffery Nichols.) 1477 1478 1479Release 2019c - 2019-09-11 08:59:48 -0700 1480 1481 Briefly: 1482 Fiji observes DST from 2019-11-10 to 2020-01-12. 1483 Norfolk Island starts observing Australian-style DST. 1484 1485 Changes to future timestamps 1486 1487 Fiji's next DST transitions will be 2019-11-10 and 2020-01-12 1488 instead of 2019-11-03 and 2020-01-19. (Thanks to Raymond Kumar.) 1489 Adjust future guesses accordingly. 1490 1491 Norfolk Island will observe Australian-style DST starting in 1492 spring 2019. The first transition is on 2019-10-06. (Thanks to 1493 Kyle Czech and Michael Deckers.) 1494 1495 Changes to past timestamps 1496 1497 Many corrections to time in Turkey from 1940 through 1985. 1498 (Thanks to Oya Vulaş via Alois Treindl, and to Kıvanç Yazan.) 1499 1500 The Norfolk Island 1975-03-02 transition was at 02:00 standard 1501 time, not 02:00 DST. (Thanks to Michael Deckers.) 1502 1503 South Korea observed DST from 1948 through 1951. Although this 1504 info was supposed to appear in release 2014j, a typo inadvertently 1505 suppressed the change. (Thanks to Alois Treindl.) 1506 1507 Detroit observed DST in 1967 and 1968 following the US DST rules, 1508 except that its 1967 DST began on June 14 at 00:01. (Thanks to 1509 Alois Treindl for pointing out that the old data entries were 1510 probably wrong.) 1511 1512 Fix several errors in pre-1970 transitions in Perry County, IN. 1513 (Thanks to Alois Treindl for pointing out the 1967/9 errors.) 1514 1515 Edmonton did not observe DST in 1967 or 1969. In 1946 Vancouver 1516 ended DST on 09-29 not 10-13, and Vienna ended DST on 10-07 not 1517 10-06. In 1945 Königsberg (now Kaliningrad) switched from +01/+02 1518 to +02/+03 on 04-10 not 01-01, and its +02/+03 is abbreviated 1519 EET/EEST, not CET/CEST. (Thanks to Alois Treindl.) In 1946 1520 Königsberg switched to +03 on 04-07 not 01-01. 1521 1522 In 1946 Louisville switched from CST to CDT on 04-28 at 00:01, not 1523 01-01 at 00:00. (Thanks to Alois Treindl and Michael Deckers.) 1524 Also, it switched from CST to CDT on 1950-04-30, not 1947-04-27. 1525 1526 The 1892-05-01 transition in Brussels was at 00:17:30, not at noon. 1527 (Thanks to Michael Deckers.) 1528 1529 Changes to past time zone abbreviations and DST flags 1530 1531 Hong Kong Winter Time, observed from 1941-10-01 to 1941-12-25, 1532 is now flagged as DST and is abbreviated HKWT not HKT. 1533 1534 Changes to code 1535 1536 leapseconds.awk now relies only on its input data, rather than 1537 also relying on its comments. (Inspired by code from Dennis 1538 Ferguson and Chris Woodbury.) 1539 1540 The code now defends against CRLFs in leap-seconds.list. 1541 (Thanks to Brian Inglis and Chris Woodbury.) 1542 1543 Changes to documentation and commentary 1544 1545 theory.html discusses leap seconds. (Thanks to Steve Summit.) 1546 1547 Nashville's newspapers dueled about the time of day in the 1950s. 1548 (Thanks to John Seigenthaler.) 1549 1550 Liechtenstein observed Swiss DST in 1941/2. 1551 (Thanks to Alois Treindl.) 1552 1553 1554Release 2019b - 2019-07-01 00:09:53 -0700 1555 1556 Briefly: 1557 Brazil no longer observes DST. 1558 'zic -b slim' outputs smaller TZif files; please try it out. 1559 Palestine's 2019 spring-forward transition was on 03-29, not 03-30. 1560 1561 Changes to future timestamps 1562 1563 Brazil has canceled DST and will stay on standard time indefinitely. 1564 (Thanks to Steffen Thorsen, Marcus Diniz, and Daniel Soares de 1565 Oliveira.) 1566 1567 Predictions for Morocco now go through 2087 instead of 2037, to 1568 work around a problem on newlib when using TZif files output by 1569 zic 2019a or earlier. (Problem reported by David Gauchard.) 1570 1571 Changes to past and future timestamps 1572 1573 Palestine's 2019 spring transition was 03-29 at 00:00, not 03-30 1574 at 01:00. (Thanks to Sharef Mustafa and Even Scharning.) Guess 1575 future transitions to be March's last Friday at 00:00. 1576 1577 Changes to past timestamps 1578 1579 Hong Kong's 1941-06-15 spring-forward transition was at 03:00, not 1580 03:30. Its 1945 transition from JST to HKT was on 11-18 at 02:00, 1581 not 09-15 at 00:00. In 1946 its spring-forward transition was on 1582 04-21 at 00:00, not the previous day at 03:30. From 1946 through 1583 1952 its fall-back transitions occurred at 04:30, not at 03:30. 1584 In 1947 its fall-back transition was on 11-30, not 12-30. 1585 (Thanks to P Chan.) 1586 1587 Changes to past time zone abbreviations 1588 1589 Italy's 1866 transition to Rome Mean Time was on December 12, not 1590 September 22. This affects only the time zone abbreviation for 1591 Europe/Rome between those dates. (Thanks to Stephen Trainor and 1592 Luigi Rosa.) 1593 1594 Changes affecting metadata only 1595 1596 Add info about the Crimea situation in zone1970.tab and zone.tab. 1597 (Problem reported by Serhii Demediuk.) 1598 1599 Changes to code 1600 1601 zic's new -b option supports a way to control data bloat and to 1602 test for year-2038 bugs in software that reads TZif files. 1603 'zic -b fat' and 'zic -b slim' generate larger and smaller output; 1604 for example, changing from fat to slim shrinks the Europe/London 1605 file from 3648 to 1599 bytes, saving about 56%. Fat and slim 1606 files represent the same set of timestamps and use the same TZif 1607 format as documented in tzfile(5) and in Internet RFC 8536. 1608 Fat format attempts to work around bugs or incompatibilities in 1609 older software, notably software that mishandles 64-bit TZif data 1610 or uses obsolete TZ strings like "EET-2EEST" that lack DST rules. 1611 Slim format is more efficient and does not work around 64-bit bugs 1612 or obsolete TZ strings. Currently zic defaults to fat format 1613 unless you compile with -DZIC_BLOAT_DEFAULT=\"slim\"; this 1614 out-of-the-box default is intended to change in future releases 1615 as the buggy software often mishandles timestamps anyway. 1616 1617 zic no longer treats a set of rules ending in 2037 specially. 1618 Previously, zic assumed that such a ruleset meant that future 1619 timestamps could not be predicted, and therefore omitted a 1620 POSIX-like TZ string in the TZif output. The old behavior is no 1621 longer needed for current tzdata, and caused problems with newlib 1622 when used with older tzdata (reported by David Gauchard). 1623 1624 zic no longer generates some artifact transitions. For example, 1625 Europe/London no longer has a no-op transition in January 1996. 1626 1627 Changes to build procedure 1628 1629 tzdata.zi now assumes zic 2017c or later. This shrinks tzdata.zi 1630 by a percent or so. 1631 1632 Changes to documentation and commentary 1633 1634 The Makefile now documents the POSIXRULES macro as being obsolete, 1635 and similarly, zic's -p POSIXRULES option is now documented as 1636 being obsolete. Although the POSIXRULES feature still exists and 1637 works as before, in practice it is rarely used for its intended 1638 purpose, and it does not work either in the default reference 1639 implementation (for timestamps after 2037) or in common 1640 implementations such as GNU/Linux (for contemporary timestamps). 1641 Since POSIXRULES was designed primarily as a temporary transition 1642 facility for System V platforms that died off decades ago, it is 1643 being decommissioned rather than institutionalized. 1644 1645 New info on Bonin Islands and Marcus (thanks to Wakaba and Phake Nick). 1646 1647 1648Release 2019a - 2019-03-25 22:01:33 -0700 1649 1650 Briefly: 1651 Palestine "springs forward" on 2019-03-30 instead of 2019-03-23. 1652 Metlakatla "fell back" to rejoin Alaska Time on 2019-01-20 at 02:00. 1653 1654 Changes to past and future timestamps 1655 1656 Palestine will not start DST until 2019-03-30, instead of 2019-03-23 as 1657 previously predicted. Adjust our prediction by guessing that spring 1658 transitions will be between 24 and 30 March, which matches recent practice 1659 since 2016. (Thanks to Even Scharning and Tim Parenti.) 1660 1661 Metlakatla ended its observance of Pacific standard time, 1662 rejoining Alaska Time, on 2019-01-20 at 02:00. (Thanks to Ryan 1663 Stanley and Tim Parenti.) 1664 1665 Changes to past timestamps 1666 1667 Israel observed DST in 1980 (08-02/09-13) and 1984 (05-05/08-25). 1668 (Thanks to Alois Treindl and Isaac Starkman.) 1669 1670 Changes to time zone abbreviations 1671 1672 Etc/UCT is now a backward-compatibility link to Etc/UTC, instead 1673 of being a separate zone that generates the abbreviation "UCT", 1674 which nowadays is typically a typo. (Problem reported by Isiah 1675 Meadows.) 1676 1677 Changes to code 1678 1679 zic now has an -r option to limit the time range of output data. 1680 For example, 'zic -r @1000000000' limits the output data to 1681 timestamps starting 1000000000 seconds after the Epoch. 1682 This helps shrink output size and can be useful for applications 1683 not needing the full timestamp history, such as TZDIST truncation; 1684 see Internet RFC 8536 section 5.1. (Inspired by a feature request 1685 from Christopher Wong, helped along by bug reports from Wong and 1686 from Tim Parenti.) 1687 1688 Changes to documentation 1689 1690 Mention Internet RFC 8536 (February 2019), which documents TZif. 1691 1692 tz-link.html now cites tzdata-meta 1693 <https://tzdata-meta.timtimeonline.com/>. 1694 1695 1696Release 2018i - 2018-12-30 11:05:43 -0800 1697 1698 Briefly: 1699 São Tomé and Príncipe switches from +01 to +00 on 2019-01-01. 1700 1701 Changes to future timestamps 1702 1703 Due to a change in government, São Tomé and Príncipe switches back 1704 from +01 to +00 on 2019-01-01 at 02:00. (Thanks to Vadim 1705 Nasardinov and Michael Deckers.) 1706 1707 1708Release 2018h - 2018-12-23 17:59:32 -0800 1709 1710 Briefly: 1711 Qyzylorda, Kazakhstan moved from +06 to +05 on 2018-12-21. 1712 New zone Asia/Qostanay because Qostanay, Kazakhstan didn't move. 1713 Metlakatla, Alaska observes PST this winter only. 1714 Guess Morocco will continue to adjust clocks around Ramadan. 1715 Add predictions for Iran from 2038 through 2090. 1716 1717 Changes to future timestamps 1718 1719 Guess that Morocco will continue to fall back just before and 1720 spring forward just after Ramadan, the practice since 2012. 1721 (Thanks to Maamar Abdelkader.) This means Morocco will observe 1722 negative DST during Ramadan in main and vanguard formats, and in 1723 rearguard format it stays in the +00 timezone and observes 1724 ordinary DST in all months other than Ramadan. As before, extend 1725 this guesswork to the year 2037. As a consequence, Morocco is 1726 scheduled to observe three DST transitions in some Gregorian years 1727 (e.g., 2033) due to the mismatch between the Gregorian and Islamic 1728 calendars. 1729 1730 The table of exact transitions for Iranian DST has been extended. 1731 It formerly cut off before the year 2038 in a nod to 32-bit time_t. 1732 It now cuts off before 2091 as there is doubt about how the Persian 1733 calendar will treat 2091. This change predicts DST transitions in 1734 2038-9, 2042-3, and 2046-7 to occur one day later than previously 1735 predicted. As before, post-cutoff transitions are approximated. 1736 1737 Changes to past and future timestamps 1738 1739 Qyzylorda (aka Kyzylorda) oblast in Kazakhstan moved from +06 to 1740 +05 on 2018-12-21. This is a zone split as Qostanay (aka 1741 Kostanay) did not switch, so create a zone Asia/Qostanay. 1742 1743 Metlakatla moved from Alaska to Pacific standard time on 2018-11-04. 1744 It did not change clocks that day and remains on -08 this winter. 1745 (Thanks to Ryan Stanley.) It will revert to the usual Alaska 1746 rules next spring, so this change affects only timestamps 1747 from 2018-11-04 through 2019-03-10. 1748 1749 Change to past timestamps 1750 1751 Kwajalein's 1993-08-20 transition from -12 to +12 was at 24:00, 1752 not 00:00. I transcribed the time incorrectly from Shanks. 1753 (Thanks to Phake Nick.) 1754 1755 Nauru's 1979 transition was on 02-10 at 02:00, not 05-01 at 00:00. 1756 (Thanks to Phake Nick.) 1757 1758 Guam observed DST irregularly from 1959 through 1977. 1759 (Thanks to Phake Nick.) 1760 1761 Hong Kong observed DST in 1941 starting 06-15 (not 04-01), then on 1762 10-01 changed standard time to +08:30 (not +08). Its transition 1763 back to +08 after WWII was on 1945-09-15, not the previous day. 1764 Its 1904-10-30 change took effect at 01:00 +08 (not 00:00 LMT). 1765 (Thanks to Phake Nick, Steve Allen, and Joseph Myers.) Also, 1766 its 1952 fallback was on 11-02 (not 10-25). 1767 1768 This release contains many changes to timestamps before 1946 due 1769 to Japanese possession or occupation of Pacific/Chuuk, 1770 Pacific/Guam, Pacific/Kosrae, Pacific/Kwajalein, Pacific/Majuro, 1771 Pacific/Nauru, Pacific/Palau, and Pacific/Pohnpei. 1772 (Thanks to Phake Nick.) 1773 1774 Assume that the Spanish East Indies was like the Philippines and 1775 observed American time until the end of 1844. This affects 1776 Pacific/Chuuk, Pacific/Kosrae, Pacific/Palau, and Pacific/Pohnpei. 1777 1778 Changes to past tm_isdst flags 1779 1780 For the recent Morocco change, the tm_isdst flag should be 1 from 1781 2018-10-27 00:00 to 2018-10-28 03:00. (Thanks to Michael Deckers.) 1782 Give a URL to the official decree. (Thanks to Matt Johnson.) 1783 1784 1785Release 2018g - 2018-10-26 22:22:45 -0700 1786 1787 Briefly: 1788 Morocco switches to permanent +01 on 2018-10-28. 1789 1790 Changes to future timestamps 1791 1792 Morocco switches from +00/+01 to permanent +01 effective 2018-10-28, 1793 so its clocks will not fall back as previously scheduled. 1794 (Thanks to Mohamed Essedik Najd and Brian Inglis.) 1795 1796 Changes to code 1797 1798 When generating TZif files with leap seconds, zic no longer uses a 1799 format that trips up older 32-bit clients, fixing a bug introduced 1800 in 2018f. (Reported by Daniel Fischer.) Also, the zic workaround 1801 for QTBUG-53071 now also works for TZif files with leap seconds. 1802 1803 The translator to rearguard format now rewrites the line 1804 "Rule Japan 1948 1951 - Sep Sat>=8 25:00 0 S" to 1805 "Rule Japan 1948 1951 - Sep Sun>=9 1:00 0 S". 1806 This caters to zic before 2007 and to Oracle TZUpdater 2.2.0 1807 and earlier. (Reported by Christos Zoulas.) 1808 1809 Changes to past time zone abbreviations 1810 1811 Change HDT to HWT/HPT for WWII-era abbreviations in Hawaii. 1812 This reverts to 2011h, as the abbreviation change in 2011i was 1813 likely inadvertent. 1814 1815 Changes to documentation 1816 1817 tzfile.5 has new sections on interoperability issues. 1818 1819 1820Release 2018f - 2018-10-18 00:14:18 -0700 1821 1822 Briefly: 1823 Volgograd moves from +03 to +04 on 2018-10-28. 1824 Fiji ends DST 2019-01-13, not 2019-01-20. 1825 Most of Chile changes DST dates, effective 2019-04-06. 1826 1827 Changes to future timestamps 1828 1829 Volgograd moves from +03 to +04 on 2018-10-28 at 02:00. 1830 (Thanks to Alexander Fetisov and Stepan Golosunov.) 1831 1832 Fiji ends DST 2019-01-13 instead of the 2019-01-20 previously 1833 predicted. (Thanks to Raymond Kumar.) Adjust future predictions 1834 accordingly. 1835 1836 Most of Chile will end DST on the first Saturday in April at 24:00 mainland 1837 time, and resume DST on the first Saturday in September at 24:00 mainland 1838 time. The changes are effective from 2019-04-06, and do not affect the 1839 Magallanes region modeled by America/Punta_Arenas. (Thanks to Juan Correa 1840 and Tim Parenti.) Adjust future predictions accordingly. 1841 1842 Changes to past timestamps 1843 1844 The 2018-05-05 North Korea 30-minute time zone change took place 1845 at 23:30 the previous day, not at 00:00 that day. 1846 1847 China's 1988 spring-forward transition was on April 17, not 1848 April 10. Its DST transitions in 1986/91 were at 02:00, not 00:00. 1849 (Thanks to P Chan.) 1850 1851 Fix several issues for Macau before 1992. Macau's pre-1904 LMT 1852 was off by 10 s. Macau switched to +08 in 1904 not 1912, and 1853 temporarily switched to +09/+10 during World War II. Macau 1854 observed DST in 1942/79, not 1961/80, and there were several 1855 errors for transition times and dates. (Thanks to P Chan.) 1856 1857 The 1948-1951 fallback transitions in Japan were at 25:00 on 1858 September's second Saturday, not at 24:00. (Thanks to Phake Nick.) 1859 zic turns this into 01:00 on the day after September's second 1860 Saturday, which is the best that POSIX or C platforms can do. 1861 1862 Incorporate 1940-1949 Asia/Shanghai DST transitions from a 2014 1863 paper by Li Yu, replacing more-questionable data from Shanks. 1864 1865 Changes to time zone abbreviations 1866 1867 Use "PST" and "PDT" for Philippine time. (Thanks to Paul Goyette.) 1868 1869 Changes to code 1870 1871 zic now always generates TZif files where time type 0 is used for 1872 timestamps before the first transition. This simplifies the 1873 reading of TZif files and should not affect behavior of existing 1874 TZif readers because the same set of time types is used; only 1875 their internal indexes may have changed. This affects only the 1876 legacy zones EST5EDT, CST6CDT, MST7MDT, PST8PDT, CET, MET, and 1877 EET, which previously used nonzero types for these timestamps. 1878 1879 Because of the type 0 change, zic no longer outputs a dummy 1880 transition at time -2**59 (before the Big Bang), as clients should 1881 no longer need this to handle historical timestamps correctly. 1882 This reverts a change introduced in 2013d and shrinks most TZif 1883 files by a few bytes. 1884 1885 zic now supports negative time-of-day in Rule and Leap lines, e.g., 1886 "Rule X min max - Apr lastSun -6:00 1:00 -" means the transition 1887 occurs at 18:00 on the Saturday before the last Sunday in April. 1888 This behavior was documented in 2018a but the code did not 1889 entirely match the documentation. 1890 1891 localtime.c no longer requires at least one time type in TZif 1892 files that lack transitions or have a POSIX-style TZ string. This 1893 future-proofs the code against possible future extensions to the 1894 format that would allow TZif files with POSIX-style TZ strings and 1895 without transitions or time types. 1896 1897 A read-access subscript error in localtime.c has been fixed. 1898 It could occur only in TZif files with timecnt == 0, something that 1899 does not happen in practice now but could happen in future versions. 1900 1901 localtime.c no longer ignores TZif POSIX-style TZ strings that 1902 specify only standard time. Instead, these TZ strings now 1903 override the default time type for timestamps after the last 1904 transition (or for all timestamps if there are no transitions), 1905 just as DST strings specifying DST have always done. 1906 1907 leapseconds.awk now outputs "#updated" and "#expires" comments, 1908 and supports leap seconds at the ends of months other than June 1909 and December. (Inspired by suggestions from Chris Woodbury.) 1910 1911 Changes to documentation 1912 1913 New restrictions: A Rule name must start with a character that 1914 is neither an ASCII digit nor "-" nor "+", and an unquoted name 1915 should not use characters in the set "!$%&'()*,/:;<=>?@[\]^`{|}~". 1916 The latter restriction makes room for future extensions (a 1917 possibility noted by Tom Lane). 1918 1919 tzfile.5 now documents what time types apply before the first and 1920 after the last transition, if any. 1921 1922 Documentation now uses the spelling "timezone" for a TZ setting 1923 that determines timestamp history, and "time zone" for a 1924 geographic region currently sharing the same standard time. 1925 1926 The name "TZif" is now used for the tz binary data format. 1927 1928 tz-link.htm now mentions the A0 TimeZone Migration utilities. 1929 (Thanks to Aldrin Martoq for the link.) 1930 1931 Changes to build procedure 1932 1933 New 'make' target 'rearguard_tarballs' to build the rearguard 1934 tarball only. This is a convenience on platforms that lack lzip 1935 if you want to build the rearguard tarball. (Problem reported by 1936 Deborah Goldsmith.) 1937 1938 tzdata.zi is now more stable from release to release. (Problem 1939 noted by Tom Lane.) It is also a bit shorter. 1940 1941 tzdata.zi now can contain comment lines documenting configuration 1942 information, such as which data format was selected, which input 1943 files were used, and how leap seconds are treated. (Problems 1944 noted by Lester Caine and Brian Inglis.) If the Makefile defaults 1945 are used these comment lines are absent, for backward 1946 compatibility. A redistributor intending to alter its copy of the 1947 files should also append "-LABEL" to the 'version' file's first 1948 line, where "LABEL" identifies the redistributor's change. 1949 1950 1951Release 2018e - 2018-05-01 23:42:51 -0700 1952 1953 Briefly: 1954 1955 North Korea switches back to +09 on 2018-05-05. 1956 The main format uses negative DST again, for Ireland etc. 1957 'make tarballs' now also builds a rearguard tarball. 1958 New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines. 1959 1960 Changes to past and future timestamps 1961 1962 North Korea switches back from +0830 to +09 on 2018-05-05. 1963 (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon, 1964 and Tim Parenti.) 1965 1966 Bring back the negative-DST changes of 2018a, except be more 1967 compatible with data parsers that do not support negative DST. 1968 Also, this now affects historical timestamps in Namibia and the 1969 former Czechoslovakia, not just Ireland. The main format now uses 1970 negative DST to model timestamps in Europe/Dublin (from 1971 on), 1971 Europe/Prague (1946/7), and Africa/Windhoek (1994/2017). This 1972 does not affect UT offsets, only time zone abbreviations and the 1973 tm_isdst flag. Also, this does not affect rearguard or vanguard 1974 formats; effectively the main format now uses vanguard instead of 1975 rearguard format. Data parsers that do not support negative DST 1976 can still use data from the rearguard tarball described below. 1977 1978 Changes to build procedure 1979 1980 The command 'make tarballs' now also builds the tarball 1981 tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz 1982 except that it uses rearguard format intended for trailing-edge 1983 data parsers. 1984 1985 Changes to data format and to code 1986 1987 The SAVE column of Rule and Zone lines can now have an 's' or 'd' 1988 suffix, which specifies whether the adjusted time is standard time 1989 or daylight saving time. If no suffix is given, daylight saving 1990 time is used if and only if the SAVE column is nonzero; this is 1991 the longstanding behavior. Although this new feature is not used 1992 in tzdata, it could be used to specify the legal time in Namibia 1993 1994-2017, as opposed to the popular time (see below). 1994 1995 Changes to past timestamps 1996 1997 From 1994 through 2017 Namibia observed DST in winter, not summer. 1998 That is, it used negative DST, as Ireland still does. This change 1999 does not affect UTC offsets; it affects only the tm_isdst flag and 2000 the abbreviation used during summer, which is now CAT, not WAST. 2001 Although (as noted by Michael Deckers) summer and winter time were 2002 both simply called "standard time" in Namibian law, in common 2003 practice winter time was considered to be DST (as noted by Stephen 2004 Colebourne). The full effect of this change is only in vanguard 2005 and main format; in rearguard format, the tm_isdst flag is still 2006 zero in winter and nonzero in summer. 2007 2008 In 1946/7 Czechoslovakia also observed negative DST in winter. 2009 The full effect of this change is only in vanguard and main 2010 formats; in rearguard format, it is modeled as plain GMT without 2011 daylight saving. Also, the dates of some 1944/5 DST transitions 2012 in Czechoslovakia have been changed. 2013 2014 2015Release 2018d - 2018-03-22 07:05:46 -0700 2016 2017 Briefly: 2018 2019 Palestine starts DST a week earlier in 2018. 2020 Add support for vanguard and rearguard data consumers. 2021 Add subsecond precision to source data format, though not to data. 2022 2023 Changes to future timestamps 2024 2025 In 2018, Palestine starts DST on March 24, not March 31. 2026 Adjust future predictions accordingly. (Thanks to Sharef Mustafa.) 2027 2028 Changes to past and future timestamps 2029 2030 Casey Station in Antarctica changed from +11 to +08 on 2018-03-11 2031 at 04:00. (Thanks to Steffen Thorsen.) 2032 2033 Changes to past timestamps 2034 2035 Historical transitions for Uruguay, represented by 2036 America/Montevideo, have been updated per official legal documents, 2037 replacing previous data mainly originating from the inventions of 2038 Shanks & Pottenger. This has resulted in adjustments ranging from 2039 30 to 90 minutes in either direction over at least two dozen 2040 distinct periods ranging from one day to several years in length. 2041 A mere handful of pre-1991 transitions are unaffected; data since 2042 then has come from more reliable contemporaneous reporting. These 2043 changes affect various timestamps in 1920-1923, 1936, 1939, 2044 1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990. 2045 Additionally, Uruguay's pre-standard-time UT offset has been 2046 adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to 2047 match the location of the Observatory of the National Meteorological 2048 Institute in Montevideo. 2049 (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.) 2050 2051 East Kiribati skipped New Year's Eve 1994, not New Year's Day 1995. 2052 (Thanks to Kerry Shetline.) 2053 2054 Fix the 1912-01-01 transition for Portugal and its colonies. 2055 This transition was at 00:00 according to the new UT offset, not 2056 according to the old one. Also assume that Cape Verde switched on 2057 the same date as the rest, not in 1907. This affects 2058 Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores, 2059 Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon. 2060 (Thanks to Michael Deckers.) 2061 2062 Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in 2063 Turks & Caicos. 2064 2065 Changes to past time zone abbreviations 2066 2067 MMT took effect in Uruguay from 1908-06-10, not 1898-06-28. There 2068 is no clock change associated with the transition. 2069 2070 Changes to build procedure 2071 2072 The new DATAFORM macro in the Makefile lets the installer choose 2073 among three source data formats. The idea is to lessen downstream 2074 disruption when data formats are improved. 2075 2076 * DATAFORM=vanguard installs from the latest, bleeding-edge 2077 format. DATAFORM=main (the default) installs from the format 2078 used in the 'africa' etc. files. DATAFORM=rearguard installs 2079 from a trailing-edge format. Eventually, elements of today's 2080 vanguard format should move to the main format, and similarly 2081 the main format's features should eventually move to the 2082 rearguard format. 2083 2084 * In the current version, the main and rearguard formats are 2085 identical and match that of 2018c, so this change does not 2086 affect default behavior. The vanguard format currently contains 2087 one feature not in the main format: negative SAVE values. This 2088 improves support for Ireland, which uses Irish Standard Time 2089 (IST, UTC+01) in summer and GMT (UTC) in winter. tzcode has 2090 supported negative SAVE values for decades, and this feature 2091 should move to the main format soon. However, it will not move 2092 to the rearguard format for quite some time because some 2093 downstream parsers do not support it. 2094 2095 * The build procedure constructs three files vanguard.zi, main.zi, 2096 and rearguard.zi, one for each format. Although the files 2097 represent essentially the same data, they may have minor 2098 discrepancies that users are not likely to notice. The files 2099 are intended for downstream data consumers and are not 2100 installed. Zoneinfo parsers that do not support negative SAVE values 2101 should start using rearguard.zi, so that they will be unaffected 2102 when the negative-DST feature moves from vanguard to main. 2103 Bleeding-edge Zoneinfo parsers that support the new features 2104 already can use vanguard.zi; in this respect, current tzcode is 2105 bleeding-edge. 2106 2107 The Makefile should now be safe for parallelized builds, and 'make 2108 -j to2050new.tzs' is now much faster on a multiprocessor host 2109 with GNU Make. 2110 2111 When built with -DSUPPRESS_TZDIR, the tzcode library no longer 2112 prepends TZDIR/ to file names that do not begin with '/'. This is 2113 not recommended for general use, due to its security implications. 2114 (From a suggestion by Manuela Friedrich.) 2115 2116 Changes to code 2117 2118 zic now accepts subsecond precision in expressions like 2119 00:19:32.13, which is approximately the legal time of the 2120 Netherlands from 1835 to 1937. However, because it is 2121 questionable whether the few recorded uses of non-integer offsets 2122 had subsecond precision in practice, there are no plans for tzdata 2123 to use this feature. (Thanks to Steve Allen for pointing out 2124 the limitations of historical data in this area.) 2125 2126 The code is a bit more portable to MS-Windows. Installers can 2127 compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that 2128 reserve identifiers like 'localtime'. (Thanks to Manuela 2129 Friedrich.) 2130 2131 Changes to documentation and commentary 2132 2133 theory.html now outlines tzdb's extensions to POSIX's model for 2134 civil time, and has a section "POSIX features no longer needed" 2135 that lists POSIX API components that are now vestigial. 2136 (From suggestions by Steve Summit.) It also better distinguishes 2137 time zones from tz regions. (From a suggestion by Guy Harris.) 2138 2139 Commentary is now more consistent about using the phrase "daylight 2140 saving time", to match the C name tm_isdst. Daylight saving time 2141 need not occur in summer, and need not have a positive offset from 2142 standard time. 2143 2144 Commentary about historical transitions in Uruguay has been expanded 2145 with links to many relevant legal documents. 2146 (Thanks to Tim Parenti.) 2147 2148 Commentary now uses some non-ASCII characters with Unicode value 2149 less than U+0100, as they can be useful and should work even with 2150 older editors such as XEmacs. 2151 2152 2153Release 2018c - 2018-01-22 23:00:44 -0800 2154 2155 Briefly: 2156 Revert Irish changes that relied on negative SAVE values. 2157 2158 Changes to tm_isdst 2159 2160 Revert the 2018a change to Europe/Dublin. As before, this change 2161 does not affect UT offsets or abbreviations; it affects only 2162 whether timestamps are considered to be standard time or 2163 daylight-saving time, as expressed in the tm_isdst flag of C's 2164 struct tm type. This reversion is intended to be a temporary 2165 workaround for problems discovered with downstream uses of 2166 releases 2018a and 2018b, which implemented Irish time by using 2167 negative SAVE values in the Eire rules of the 'europe' file. 2168 Although negative SAVE values have been part of tzcode for many 2169 years and are supported by many platforms, they were not 2170 documented before 2018a and ICU and OpenJDK do not currently 2171 support them. A mechanism to export data to platforms lacking 2172 support for negative DST is planned to be developed before the 2173 change is reapplied. (Problems reported by Deborah Goldsmith and 2174 Stephen Colebourne.) 2175 2176 Changes to past timestamps 2177 2178 Japanese DST transitions (1948-1951) were Sundays at 00:00, not 2179 Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.) 2180 2181 Changes to build procedure 2182 2183 The build procedure now works around mawk 1.3.3's lack of support 2184 for character class expressions. (Problem reported by Ohyama.) 2185 2186 2187Release 2018b - 2018-01-17 23:24:48 -0800 2188 2189 Briefly: 2190 Fix a packaging problem in tz2018a, which was missing 'pacificnew'. 2191 2192 Changes to build procedure 2193 2194 The distribution now contains the file 'pacificnew' again. 2195 This file was inadvertently omitted in the 2018a distribution. 2196 (Problem reported by Matias Fonzo.) 2197 2198 2199Release 2018a - 2018-01-12 22:29:21 -0800 2200 2201 Briefly: 2202 São Tomé and Príncipe switched from +00 to +01. 2203 Brazil's DST will now start on November's first Sunday. 2204 Ireland's standard time is now in the summer, not the winter. 2205 Use Debian-style installation locations, instead of 4.3BSD-style. 2206 New zic option -t. 2207 2208 Changes to past and future timestamps 2209 2210 São Tomé and Príncipe switched from +00 to +01 on 2018-01-01 at 2211 01:00. (Thanks to Steffen Thorsen and Michael Deckers.) 2212 2213 Changes to future timestamps 2214 2215 Starting in 2018 southern Brazil will begin DST on November's 2216 first Sunday instead of October's third Sunday. (Thanks to 2217 Steffen Thorsen.) 2218 2219 Changes to past timestamps 2220 2221 A discrepancy of 4 s in timestamps before 1931 in South Sudan has 2222 been corrected. The 'backzone' and 'zone.tab' files did not agree 2223 with the 'africa' and 'zone1970.tab' files. (Problem reported by 2224 Michael Deckers.) 2225 2226 The abbreviation invented for Bolivia Summer Time (1931-2) is now 2227 BST instead of BOST, to be more consistent with the convention 2228 used for Latvian Summer Time (1918-9) and for British Summer Time. 2229 2230 Changes to tm_isdst 2231 2232 Change Europe/Dublin so that it observes Irish Standard Time (UT 2233 +01) in summer and GMT (as negative daylight-saving) in winter, 2234 instead of observing standard time (GMT) in winter and Irish 2235 Summer Time (UT +01) in summer. This change does not affect UT 2236 offsets or abbreviations; it affects only whether timestamps are 2237 considered to be standard time or daylight-saving time, as 2238 expressed in the tm_isdst flag of C's struct tm type. 2239 (Discrepancy noted by Derick Rethans.) 2240 2241 Changes to build procedure 2242 2243 The default installation locations have been changed to mostly 2244 match Debian circa 2017, instead of being designed as an add-on to 2245 4.3BSD circa 1986. This affects the Makefile macros TOPDIR, 2246 TZDIR, MANDIR, and LIBDIR. New Makefile macros TZDEFAULT, USRDIR, 2247 USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor 2248 locations more precisely. (This responds to suggestions from 2249 Brian Inglis and from Steve Summit.) 2250 2251 The default installation procedure no longer creates the 2252 backward-compatibility link US/Pacific-New, which causes 2253 confusion during user setup (e.g., see Debian bug 815200). 2254 Use 'make BACKWARD="backward pacificnew"' to create the link 2255 anyway, for now. Eventually we plan to remove the link entirely. 2256 2257 tzdata.zi now contains a version-number comment. 2258 (Suggested by Tom Lane.) 2259 2260 The Makefile now quotes values like BACKWARD more carefully when 2261 passing them to the shell. (Problem reported by Zefram.) 2262 2263 Builders no longer need to specify -DHAVE_SNPRINTF on platforms 2264 that have snprintf and use pre-C99 compilers. (Problem reported 2265 by Jon Skeet.) 2266 2267 Changes to code 2268 2269 zic has a new option -t FILE that specifies the location of the 2270 file that determines local time when TZ is unset. The default for 2271 this location can be configured via the new TZDEFAULT makefile 2272 macro, which defaults to /etc/localtime. 2273 2274 Diagnostics and commentary now distinguish UT from UTC more 2275 carefully; see theory.html for more information about UT vs UTC. 2276 2277 zic has been ported to GCC 8's -Wstringop-truncation option. 2278 (Problem reported by Martin Sebor.) 2279 2280 Changes to documentation and commentary 2281 2282 The zic man page now documents the longstanding behavior that 2283 times and years can be out of the usual range, with negative times 2284 counting backwards from midnight and with year 0 preceding year 1. 2285 (Problem reported by Michael Deckers.) 2286 2287 The theory.html file now mentions the POSIX limit of six chars 2288 per abbreviation, and lists alphabetic abbreviations used. 2289 2290 The files tz-art.htm and tz-link.htm have been renamed to 2291 tz-art.html and tz-link.html, respectively, for consistency with 2292 other file names and to simplify web server configuration. 2293 2294 2295Release 2017c - 2017-10-20 14:49:34 -0700 2296 2297 Briefly: 2298 Northern Cyprus switches from +03 to +02/+03 on 2017-10-29. 2299 Fiji ends DST 2018-01-14, not 2018-01-21. 2300 Namibia switches from +01/+02 to +02 on 2018-04-01. 2301 Sudan switches from +03 to +02 on 2017-11-01. 2302 Tonga likely switches from +13/+14 to +13 on 2017-11-05. 2303 Turks & Caicos switches from -04 to -05/-04 on 2018-11-04. 2304 A new file tzdata.zi now holds a small text copy of all data. 2305 The zic input format has been regularized slightly. 2306 2307 Changes to future timestamps 2308 2309 Northern Cyprus has decided to resume EU rules starting 2310 2017-10-29, thus reinstituting winter time. 2311 2312 Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously 2313 predicted. (Thanks to Dominic Fok.) Adjust future predictions 2314 accordingly. 2315 2316 Namibia will switch from +01 with DST to +02 all year on 2317 2017-09-03 at 02:00. This affects UT offsets starting 2018-04-01 2318 at 02:00. (Thanks to Steffen Thorsen.) 2319 2320 Sudan will switch from +03 to +02 on 2017-11-01. (Thanks to Ahmed 2321 Atyya and Yahia Abdalla.) South Sudan is not switching, so 2322 Africa/Juba is no longer a link to Africa/Khartoum. 2323 2324 Tonga has likely ended its experiment with DST, and will not 2325 adjust its clocks on 2017-11-05. Although Tonga has not announced 2326 whether it will continue to observe DST, the IATA is assuming that 2327 it will not. (Thanks to David Wade.) 2328 2329 Turks & Caicos will switch from -04 all year to -05 with US DST on 2330 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04 2331 at 02:00. (Thanks to Steffen Thorsen.) 2332 2333 Changes to past timestamps 2334 2335 Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03. 2336 (Thanks to Arthur David Olson.) 2337 2338 Detroit did not observe DST in 1967. 2339 2340 Use railway time for Asia/Kolkata before 1941, by switching to 2341 Madras local time (UT +052110) in 1870, then to IST (UT +0530) in 2342 1906. Also, treat 1941-2's +0630 as DST, like 1942-5. 2343 2344 Europe/Dublin's 1946 and 1947 fallback transitions occurred at 2345 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.) 2346 2347 Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to 2348 American time in 1892, not 1879. (Thanks to Michael Deckers.) 2349 2350 Adjust the 1867 transition in Alaska to better reflect the 2351 historical record, by changing it to occur on 1867-10-18 at 15:30 2352 Sitka time rather than at the start of 1867-10-17 local time. 2353 Although strictly speaking this is accurate only for Sitka, 2354 the rest of Alaska's blanks need to be filled in somehow. 2355 2356 Fix off-by-one errors in UT offsets for Adak and Nome before 1867. 2357 (Thanks to Michael Deckers.) 2358 2359 Add 7 s to the UT offset in Asia/Yangon before 1920. 2360 2361 Changes to zone names 2362 2363 Remove Canada/East-Saskatchewan from the 'backward' file, as it 2364 exceeded the 14-character limit and was an unused misnomer anyway. 2365 2366 Changes to build procedure 2367 2368 To support applications that prefer to read time zone data in text 2369 form, two zic input files tzdata.zi and leapseconds are now 2370 installed by default. The commands 'zic tzdata.zi' and 'zic -L 2371 leapseconds tzdata.zi' can reproduce the tzdata binary files 2372 without and with leap seconds, respectively. To prevent these two 2373 new files from being installed, use 'make TZDATA_TEXT=', and to 2374 suppress leap seconds from the tzdata text installation, use 'make 2375 TZDATA_TEXT=tzdata.zi'. 2376 2377 'make BACKWARD=' now suppresses backward-compatibility names 2378 like 'US/Pacific' that are defined in the 'backward' and 2379 'pacificnew' files. 2380 2381 'make check' now works on systems that lack a UTF-8 locale, 2382 or that lack the nsgmls program. Set UTF8_LOCALE to configure 2383 the name of a UTF-8 locale, if you have one. 2384 2385 Y2K runtime checks are no longer enabled by default. Add 2386 -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of 2387 adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU 2388 to disable them. (New name suggested by Brian Inglis.) 2389 2390 The build procedure for zdump now works on AIX 7.1. 2391 (Problem reported by Kees Dekker.) 2392 2393 Changes to code 2394 2395 zic and the reference runtime now reject multiple leap seconds 2396 within 28 days of each other, or leap seconds before the Epoch. 2397 As a result, support for double leap seconds, which was 2398 obsolescent and undocumented, has been removed. Double leap 2399 seconds were an error in the C89 standard; they have never existed 2400 in civil timekeeping. (Thanks to Robert Elz and Bradley White for 2401 noticing glitches in the code that uncovered this problem.) 2402 2403 zic now warns about use of the obsolescent and undocumented -y 2404 option, and about use of the obsolescent TYPE field of Rule lines. 2405 2406 zic now allows unambiguous abbreviations like "Sa" and "Su" for 2407 weekdays; formerly it rejected them due to a bug. Conversely, zic 2408 no longer considers non-prefixes to be abbreviations; for example, 2409 it no longer accepts "lF" as an abbreviation for "lastFriday". 2410 Also, zic warns about the undocumented usage with a "last-" 2411 prefix, e.g., "last-Fri". 2412 2413 Similarly, zic now accepts the unambiguous abbreviation "L" for 2414 "Link" in ordinary context and for "Leap" in leap-second context. 2415 Conversely, zic no longer accepts non-prefixes such as "La" as 2416 abbreviations for words like "Leap". 2417 2418 zic no longer accepts leap second lines in ordinary input, or 2419 ordinary lines in leap second input. Formerly, zic sometimes 2420 warned about this undocumented usage and handled it incorrectly. 2421 2422 The new macro HAVE_TZNAME governs whether the tzname external 2423 variable is exported, instead of USG_COMPAT. USG_COMPAT now 2424 governs only the external variables "timezone" and "daylight". 2425 This change is needed because the three variables are not in the 2426 same category: although POSIX requires tzname, it specifies the 2427 other two variables as optional. Also, USG_COMPAT is now 1 or 0: 2428 if not defined, the code attempts to guess it from other macros. 2429 2430 localtime.c and difftime.c no longer require stdio.h, and .c files 2431 other than zic.c no longer require sys/wait.h. 2432 2433 zdump.c no longer assumes snprintf. (Reported by Jonathan Leffler.) 2434 2435 Calculation of time_t extrema works around a bug in GCC 4.8.4 2436 (Reported by Stan Shebs and Joseph Myers.) 2437 2438 zic.c no longer mistranslates formats of line numbers in non-English 2439 locales. (Problem reported by Benno Schulenberg.) 2440 2441 Several minor changes have been made to the code to make it a 2442 bit easier to port to MS-Windows and Solaris. (Thanks to Kees 2443 Dekker for reporting the problems.) 2444 2445 Changes to documentation and commentary 2446 2447 The two new files 'theory.html' and 'calendars' contain the 2448 contents of the removed file 'Theory'. The goal is to document 2449 tzdb theory more accessibly. 2450 2451 The zic man page now documents abbreviation rules. 2452 2453 tz-link.htm now covers how to apply tzdata changes to clients. 2454 (Thanks to Jorge Fábregas for the AIX link.) It also mentions MySQL. 2455 2456 The leap-seconds.list URL has been updated to something that is 2457 more reliable for tzdb. (Thanks to Tim Parenti and Brian Inglis.) 2458 2459Release 2017b - 2017-03-17 07:30:38 -0700 2460 2461 Briefly: Haiti has resumed DST. 2462 2463 Changes to past and future timestamps 2464 2465 Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.) 2466 2467 Changes to past timestamps 2468 2469 Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01. 2470 2471 Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430" 2472 is one byte over the POSIX limit. (Problem reported by Derick Rethans.) 2473 2474 Changes to code 2475 2476 The reference localtime implementation now falls back on the 2477 current US daylight-saving transition rules rather than the 2478 1987-2006 rules. This fallback occurs only when (1) the TZ 2479 environment variable has a value like "AST4ADT" that asks 2480 for daylight saving time but does not specify the rules, (2) there 2481 is no file by that name, and (3) the TZDEFRULES file cannot be 2482 loaded. (Thanks to Tom Lane.) 2483 2484 2485Release 2017a - 2017-02-28 00:05:36 -0800 2486 2487 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia 2488 discontinues DST. 2489 2490 Changes to future timestamps 2491 2492 Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.) 2493 2494 Chile's Region of Magallanes moves from -04/-03 to -03 year-round. 2495 Its clocks diverge from America/Santiago starting 2017-05-13 at 2496 23:00, hiving off a new zone America/Punta_Arenas. Although the 2497 Chilean government says this change expires in May 2019, for now 2498 assume it's permanent. (Thanks to Juan Correa and Deborah 2499 Goldsmith.) This also affects Antarctica/Palmer. 2500 2501 Changes to past timestamps 2502 2503 Fix many entries for historical timestamps for Europe/Madrid 2504 before 1979, to agree with tables compiled by Pere Planesas of the 2505 National Astronomical Observatory of Spain. As a side effect, 2506 this changes some timestamps for Africa/Ceuta before 1929, which 2507 are probably guesswork anyway. (Thanks to Steve Allen and 2508 Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for 2509 correcting the 1901 transition.) 2510 2511 Ecuador observed DST from 1992-11-28 to 1993-02-05. 2512 (Thanks to Alois Treindl.) 2513 2514 Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21. 2515 (Thanks to Stepan Golosunov.) 2516 2517 Changes to past and future time zone abbreviations 2518 2519 Switch to numeric time zone abbreviations for South America, as 2520 part of the ongoing project of removing invented abbreviations. 2521 This avoids the need to invent an abbreviation for the new Chilean 2522 new zone. Similarly, switch from invented to numeric time zone 2523 abbreviations for Afghanistan, American Samoa, the Azores, 2524 Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei, 2525 Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is, 2526 Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland, 2527 Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia, 2528 the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia, 2529 Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau, 2530 Papua New Guinea, the Philippines, Pitcairn, Qatar, Réunion, St 2531 Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore, 2532 Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and 2533 Xinjiang; for 20-minute daylight saving time in Ghana before 1943; 2534 for half-hour daylight saving time in Belize before 1944 and in 2535 the Dominican Republic before 1975; and for Canary Islands before 2536 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for 2537 Indian Summer Time before 1942, for Indonesia before around 1964, 2538 for Kenya before 1960, for Liberia before 1973, for Madeira before 2539 1967, for Namibia before 1943, for the Netherlands in 1937-9, for 2540 Pakistan before 1971, for Western Sahara before 1977, and for 2541 Zaporozhye in 1880-1924. 2542 2543 For Alaska time from 1900 through 1967, instead of "CAT" use the 2544 abbreviation "AST", the abbreviation commonly used at the time 2545 (Atlantic Standard Time had not been standardized yet). Use "AWT" 2546 and "APT" instead of the invented abbreviations "CAWT" and "CAPT". 2547 2548 Use "CST" and "CDT" instead of invented abbreviations for Macau 2549 before 1999 and Taiwan before 1938, and use "JST" instead of the 2550 invented abbreviation "JCST" for Japan and Korea before 1938. 2551 2552 Change to database entry category 2553 2554 Move the Pacific/Johnston link from 'australasia' to 'backward', 2555 since Johnston is now uninhabited. 2556 2557 Changes to code 2558 2559 zic no longer mishandles some transitions in January 2038 when it 2560 attempts to work around Qt bug 53071. This fixes a bug affecting 2561 Pacific/Tongatapu that was introduced in zic 2016e. localtime.c 2562 now contains a workaround, useful when loading a file generated by 2563 a buggy zic. (Problem and localtime.c fix reported by Bradley 2564 White.) 2565 2566 zdump -i now outputs non-hour numeric time zone abbreviations 2567 without a colon, e.g., "+0530" rather than "+05:30". This agrees 2568 with zic %z and with common practice, and simplifies auditing of 2569 zdump output. 2570 2571 zdump is now buildable again with -DUSE_LTZ=0. 2572 (Problem reported by Joseph Myers.) 2573 2574 zdump.c now always includes private.h, to avoid code duplication 2575 with private.h. (Problem reported by Kees Dekker.) 2576 2577 localtime.c no longer mishandles early or late timestamps 2578 when TZ is set to a POSIX-style string that specifies DST. 2579 (Problem reported by Kees Dekker.) 2580 2581 date and strftime now cause %z to generate "-0000" instead of 2582 "+0000" when the UT offset is zero and the time zone abbreviation 2583 begins with "-". 2584 2585 Changes to documentation and commentary 2586 2587 The 'Theory' file now better documents choice of historical time 2588 zone abbreviations. (Problems reported by Michael Deckers.) 2589 2590 tz-link.htm now covers leap smearing, which is popular in clouds. 2591 2592 2593Release 2016j - 2016-11-22 23:17:13 -0800 2594 2595 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04. 2596 2597 Changes to future timestamps 2598 2599 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00. 2600 This hives off a new zone Europe/Saratov from Europe/Volgograd. 2601 (Thanks to Yuri Konotopov and Stepan Golosunov.) 2602 2603 Changes to past timestamps 2604 2605 The new zone Asia/Atyrau for Atyraū Region, Kazakhstan, is like 2606 Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring 2607 1999, not fall 1994. (Thanks to Stepan Golosunov.) 2608 2609 Changes to past time zone abbreviations 2610 2611 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote 2612 summer time before 1948. The old use of "EET" was a typo. 2613 2614 Changes to code 2615 2616 zic no longer mishandles file systems that lack hard links, fixing 2617 bugs introduced in 2016g. (Problems reported by Tom Lane.) 2618 Also, when the destination already contains symbolic links, zic 2619 should now work better on systems where the 'link' system call 2620 does not follow symbolic links. 2621 2622 Changes to documentation and commentary 2623 2624 tz-link.htm now documents the relationship between release version 2625 numbers and development-repository commit tags. (Suggested by 2626 Paul Koning.) 2627 2628 The 'Theory' file now documents UT. 2629 2630 iso3166.tab now accents "Curaçao", and commentary now mentions 2631 the names "Cabo Verde" and "Czechia". (Thanks to Jiří Boháč.) 2632 2633 2634Release 2016i - 2016-11-01 23:19:52 -0700 2635 2636 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga 2637 reintroduces DST on 2016-11-06. 2638 2639 Changes to future timestamps 2640 2641 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on 2642 2017-01-15 at 03:00. Assume future observances in Tonga will be 2643 from the first Sunday in November through the third Sunday in 2644 January, like Fiji. (Thanks to Pulu ʻAnau.) Switch to numeric 2645 time zone abbreviations for this zone. 2646 2647 Changes to past and future timestamps 2648 2649 Northern Cyprus is now +03 year round, causing a split in Cyprus 2650 time zones starting 2016-10-30 at 04:00. This creates a zone 2651 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.) 2652 2653 Antarctica/Casey switched from +08 to +11 on 2016-10-22. 2654 (Thanks to Steffen Thorsen.) 2655 2656 Changes to past timestamps 2657 2658 Several corrections were made for pre-1975 timestamps in Italy. 2659 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and 2660 Europe/Vatican. 2661 2662 First, the 1893-11-01 00:00 transition in Italy used the new UT 2663 offset (+01), not the old (+00:49:56). (Thanks to Michael 2664 Deckers.) 2665 2666 Second, rules for daylight saving in Italy were changed to agree 2667 with Italy's National Institute of Metrological Research (INRiM) 2668 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian 2669 Inglis, and Michael Deckers): 2670 2671 The 1916-06-03 transition was at 24:00, not 00:00. 2672 2673 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at 2674 00:00, not 01:00. 2675 2676 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not 2677 01:00. 2678 2679 The 1944-09-17 transition was at 03:00, not 01:00. This 2680 particular change is taken from Italian law as INRiM's table, 2681 (which says 02:00) appears to have a typo here. Also, keep the 2682 1944-04-03 transition for Europe/Rome, as Rome was controlled by 2683 Germany then. 2684 2685 The 1967-1970 and 1972-1974 fallback transitions were at 01:00, 2686 not 00:00. 2687 2688 Changes to code 2689 2690 The code should now be buildable on AmigaOS merely by setting the 2691 appropriate Makefile variables. (From a patch by Carsten Larsen.) 2692 2693 2694Release 2016h - 2016-10-19 23:17:57 -0700 2695 2696 Changes to future timestamps 2697 2698 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not 2699 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that 2700 future fall transitions will be on the last Saturday of October 2701 at 01:00, which is consistent with predicted spring transitions 2702 on the last Saturday of March. (Thanks to Tim Parenti.) 2703 2704 Changes to past timestamps 2705 2706 In Turkey, transitions in 1986-1990 were at 01:00 standard time 2707 not at 02:00, and the spring 1994 transition was on March 20, not 2708 March 27. (Thanks to Kıvanç Yazan.) 2709 2710 Changes to past and future time zone abbreviations 2711 2712 Asia/Colombo now uses numeric time zone abbreviations like "+0530" 2713 instead of alphabetic ones like "IST" and "LKT". Various 2714 English-language sources use "IST", "LKT" and "SLST", with no 2715 working consensus. (Usage of "SLST" mentioned by Sadika 2716 Sumanapala.) 2717 2718 Changes to code 2719 2720 zic no longer mishandles relativizing file names when creating 2721 symbolic links like /etc/localtime, when these symbolic links 2722 are outside the usual directory hierarchy. This fixes a bug 2723 introduced in 2016g. (Problem reported by Andreas Stieger.) 2724 2725 Changes to build procedure 2726 2727 New rules 'traditional_tarballs' and 'traditional_signatures' for 2728 building just the traditional-format distribution. (Requested by 2729 Deborah Goldsmith.) 2730 2731 The file 'version' is now put into the tzdata tarball too. 2732 (Requested by Howard Hinnant.) 2733 2734 Changes to documentation and commentary 2735 2736 The 'Theory' file now has a section on interface stability. 2737 (Requested by Paul Koning.) It also mentions features like 2738 tm_zone and localtime_rz that have long been supported by the 2739 reference code. 2740 2741 tz-link.htm has improved coverage of time zone boundaries suitable 2742 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt 2743 Johnson.) 2744 2745 The US commentary now mentions Allen and the "day of two noons". 2746 2747 The Fiji commentary mentions the government's 2016-10-03 press 2748 release. (Thanks to Raymond Kumar.) 2749 2750 2751Release 2016g - 2016-09-13 08:56:38 -0700 2752 2753 Changes to future timestamps 2754 2755 Turkey switched from EET/EEST (+02/+03) to permanent +03, 2756 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather 2757 than an invented abbreviation for the new time. 2758 2759 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52. 2760 (Thanks to Tim Parenti.) 2761 2762 Changes to past timestamps 2763 2764 For America/Los_Angeles, spring-forward transition times have been 2765 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in 2766 1950-1966. 2767 2768 For zones using Soviet time on 1919-07-01, transitions to UT-based 2769 time were at 00:00 UT, not at 02:00 local time. The affected 2770 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and 2771 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.) 2772 2773 Changes to past and future time zone abbreviations 2774 2775 The Factory zone now uses the time zone abbreviation -00 instead 2776 of a long English-language string, as -00 is now the normal way to 2777 represent an undefined time zone. 2778 2779 Several zones in Antarctica and the former Soviet Union, along 2780 with zones intended for ships at sea that cannot use POSIX TZ 2781 strings, now use numeric time zone abbreviations instead of 2782 invented or obsolete alphanumeric abbreviations. The affected 2783 zones are Antarctica/Casey, Antarctica/Davis, 2784 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera, 2785 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok, 2786 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita, 2787 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga, 2788 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin, 2789 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi, 2790 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg, 2791 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11, 2792 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5, 2793 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2, 2794 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8, 2795 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad, 2796 Europe/Minsk, Europe/Samara, Europe/Volgograd, and 2797 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM 2798 was replaced by +05, whereas MSK and MSD were kept as they are not 2799 our invention and are widely used. 2800 2801 Changes to zone names 2802 2803 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link. 2804 (Thanks to David Massoud.) 2805 2806 Changes to code 2807 2808 zic no longer generates binary files containing POSIX TZ-like 2809 strings that disagree with the local time type after the last 2810 explicit transition in the data. This fixes a bug with 2811 Africa/Casablanca and Africa/El_Aaiun in some year-2037 timestamps 2812 on the reference platform. (Thanks to Alexander Belopolsky for 2813 reporting the bug and suggesting a way forward.) 2814 2815 If the installed localtime and/or posixrules files are symbolic 2816 links, zic now keeps them symbolic links when updating them, for 2817 compatibility with platforms like OpenSUSE where other programs 2818 configure these files as symlinks. 2819 2820 zic now avoids hard linking to symbolic links, avoids some 2821 unnecessary mkdir and stat system calls, and uses shorter file 2822 names internally. 2823 2824 zdump has a new -i option to generate transitions in a 2825 smaller but still human-readable format. This option is 2826 experimental, and the output format may change in future versions. 2827 (Thanks to Jon Skeet for suggesting that an option was needed, 2828 and thanks to Tim Parenti and Chris Rovick for further comments.) 2829 2830 Changes to build procedure 2831 2832 An experimental distribution format is available, in addition 2833 to the traditional format which will continue to be distributed. 2834 The new format is a tarball tzdb-VERSION.tar.lz with signature 2835 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory 2836 tzdb-VERSION containing the code and data of the traditional 2837 two-tarball format, along with extra data that may be useful. 2838 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others 2839 for comments about the experimental format.) 2840 2841 The release version number is now more accurate in the usual case 2842 where releases are built from a Git repository. For example, if 2843 23 commits and some working-file changes have been made since 2844 release 2016g, the version number is now something like 2845 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'. 2846 Tagged releases use the same version number format as before, 2847 e.g., '2016g'. To support the more accurate version number, its 2848 specification has moved from a line in the Makefile to a new 2849 source file 'version'. 2850 2851 The experimental distribution contains a file to2050.tzs that 2852 contains what should be the output of 'zdump -i -c 2050' on 2853 primary zones. If this file is available, 'make check' now checks 2854 that zdump generates this output. 2855 2856 'make check_web' now works on Fedora-like distributions. 2857 2858 Changes to documentation and commentary 2859 2860 tzfile.5 now documents the new restriction on POSIX TZ-like 2861 strings that is now implemented by zic. 2862 2863 Comments now cite URLs for some 1917-1921 Russian DST decrees. 2864 (Thanks to Alexander Belopolsky.) 2865 2866 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J 2867 (thanks to Meno Hochschild) and ThreeTen-Extra, and its 2868 description of Java 8 has been brought up to date (thanks to 2869 Stephen Colebourne). Its description of local time on Mars has 2870 been updated to match current practice, and URLs have been updated 2871 and some obsolete ones removed. 2872 2873 2874Release 2016f - 2016-07-05 16:26:51 +0200 2875 2876 Changes affecting future timestamps 2877 2878 The Egyptian government changed its mind on short notice, and 2879 Africa/Cairo will not introduce DST starting 2016-07-07 after all. 2880 (Thanks to Mina Samuel.) 2881 2882 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00. 2883 (Thanks to Stepan Golosunov.) 2884 2885 Changes to past and future timestamps 2886 2887 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone 2888 abbreviations instead of invented ones. 2889 2890 Changes affecting past timestamps 2891 2892 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00. 2893 (Thanks to Stepan Golosunov.) 2894 2895 2896Release 2016e - 2016-06-14 08:46:16 -0700 2897 2898 Changes affecting future timestamps 2899 2900 Africa/Cairo observes DST in 2016 from July 7 to the end of October. 2901 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.) 2902 For future years, guess April's last Thursday to October's last 2903 Thursday except for Ramadan. 2904 2905 Changes affecting past timestamps 2906 2907 Locations while uninhabited now use '-00', not 'zzz', as a 2908 placeholder time zone abbreviation. This is inspired by Internet 2909 RFC 3339 and is more consistent with numeric time zone 2910 abbreviations already used elsewhere. The change affects several 2911 arctic and antarctic locations, e.g., America/Cambridge_Bay before 2912 1920 and Antarctica/Troll before 2005. 2913 2914 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was 2915 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.) 2916 2917 Changes to code 2918 2919 zic now outputs a dummy transition at time 2**31 - 1 in zones 2920 whose POSIX-style TZ strings contain a '<'. This mostly works 2921 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>. 2922 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.) 2923 2924 Changes affecting documentation and commentary 2925 2926 tz-link.htm says why governments should give plenty of notice for 2927 time zone or DST changes, and refers to Matt Johnson's blog post. 2928 2929 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.) 2930 2931 2932Release 2016d - 2016-04-17 22:50:29 -0700 2933 2934 Changes affecting future timestamps 2935 2936 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30. 2937 (Thanks to Alexander Krivenyshev for the heads-up.) 2938 2939 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00. 2940 (Thanks to Alexander Krivenyshev and Matt Johnson.) 2941 2942 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers 2943 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29 2944 at 02:00. (Thanks to Stepan Golosunov.) 2945 2946 Changes affecting past timestamps 2947 2948 New zone Europe/Kirov, split off from Europe/Volgograd. It covers 2949 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on 2950 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made 2951 the same change. (Thanks to Stepan Golosunov.) 2952 2953 Russia and nearby locations had daylight-saving transitions on 2954 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on 2955 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan 2956 Golosunov.) 2957 2958 Many corrections to historical time in Kazakhstan from 1991 2959 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's 2960 invented time zone abbreviations with numeric abbreviations. 2961 2962 Changes to commentary 2963 2964 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references). 2965 2966 2967Release 2016c - 2016-03-23 00:51:27 -0700 2968 2969 Changes affecting future timestamps 2970 2971 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.) 2972 2973 Chile reverts from permanent to seasonal DST. (Thanks to Juan 2974 Correa for the heads-up, and to Tim Parenti for corrections.) 2975 Guess that future transitions are August's and May's second 2976 Saturdays at 24:00 mainland time. Also, call the period from 2977 2014-09-07 through 2016-05-14 daylight saving time instead of 2978 standard time, as that seems more appropriate now. 2979 2980 Changes affecting past timestamps 2981 2982 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to 2983 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed 2984 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26. 2985 (Thanks to Stepan Golosunov.) 2986 2987 Changes to commentary 2988 2989 Several updates and URLs for historical and proposed Russian changes. 2990 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.) 2991 2992 2993Release 2016b - 2016-03-12 17:30:14 -0800 2994 2995 Compatibility note 2996 2997 Starting with release 2016b, some data entries cause zic implementations 2998 derived from tz releases 2005j through 2015e to issue warnings like 2999 "time zone abbreviation differs from POSIX standard (+03)". 3000 These warnings should not otherwise affect zic's output and can safely be 3001 ignored on today's platforms, as the warnings refer to a restriction in 3002 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the 3003 warnings is to upgrade to zic derived from tz releases 2015f and later. 3004 3005 Changes affecting future timestamps 3006 3007 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and 3008 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on 3009 2016-03-27 at 02:00 local time. They need distinct zones since their 3010 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and 3011 Altai Republic, Russia, which will switch from +06 to +07 on the same date 3012 and local time. The Astrakhan change is already official; the others have 3013 passed the first reading in the State Duma and are extremely likely. 3014 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00. 3015 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson 3016 and Stepan Golosunov for followup.) 3017 3018 As a trial of a new system that needs less information to be made up, 3019 the new zones use numeric time zone abbreviations like "+04" 3020 instead of invented abbreviations like "ASTT". 3021 3022 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via 3023 Steffen Thorsen.) 3024 3025 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00. 3026 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last 3027 Saturday at 01:00, not March's last Friday at 24:00. 3028 3029 Changes affecting past timestamps 3030 3031 Europe/Chisinau observed DST during 1990, and switched from +04 to 3032 +03 at 1990-05-06 02:00, instead of switching from +03 to +02. 3033 (Thanks to Stepan Golosunov.) 3034 3035 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not 3036 KUYT/KUYST. (Thanks to Stepan Golosunov.) 3037 3038 Changes to code 3039 3040 tzselect's diagnostics and checking, and checktab.awk's checking, 3041 have been improved. (Thanks to J William Piggott.) 3042 3043 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.) 3044 3045 tzselect now tests Julian-date TZ settings more accurately. 3046 (Thanks to J William Piggott.) 3047 3048 Changes to commentary 3049 3050 Comments in zone tables have been improved. (Thanks to J William Piggott.) 3051 3052 tzselect again limits its menu comments so that menus fit on a 3053 24×80 alphanumeric display. 3054 3055 A new web page tz-how-to.html. (Thanks to Bill Seymour.) 3056 3057 In the Theory file, the description of possible time zone abbreviations in 3058 tzdata has been cleaned up, as the old description was unclear and 3059 inconsistent. (Thanks to Alain Mouette for reporting the problem.) 3060 3061 3062Release 2016a - 2016-01-26 23:28:02 -0800 3063 3064 Changes affecting future timestamps 3065 3066 America/Cayman will not observe daylight saving this year after all. 3067 Revert our guess that it would. (Thanks to Matt Johnson.) 3068 3069 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00. 3070 (Thanks to Alexander Krivenyshev.) 3071 3072 Asia/Tehran now has DST predictions for the year 2038 and later, 3073 to be March 21 00:00 to September 21 00:00. This is likely better 3074 than predicting no DST, albeit off by a day every now and then. 3075 3076 Changes affecting past and future timestamps 3077 3078 America/Metlakatla switched from PST all year to AKST/AKDT on 3079 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.) 3080 3081 America/Santa_Isabel has been removed, and replaced with a 3082 backward compatibility link to America/Tijuana. Its contents were 3083 apparently based on a misreading of Mexican legislation. 3084 3085 Changes affecting past timestamps 3086 3087 Asia/Karachi's two transition times in 2002 were off by a minute. 3088 (Thanks to Matt Johnson.) 3089 3090 Changes affecting build procedure 3091 3092 An installer can now combine leap seconds with use of the backzone file, 3093 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'. 3094 The old 'make posix_packrat' rule is now marked as obsolescent. 3095 (Thanks to Ian Abbott for an initial implementation.) 3096 3097 Changes affecting documentation and commentary 3098 3099 A new file LICENSE makes it easier to see that the code and data 3100 are mostly public-domain. (Thanks to James Knight.) The three 3101 non-public-domain files now use the current (3-clause) BSD license 3102 instead of older versions of that license. 3103 3104 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki), 3105 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section 3106 on editing tz source files (with a mention of Sublime zoneinfo, 3107 thanks to Gilmore Davidson). 3108 3109 The Theory and asia files now mention the 2015 book "The Global 3110 Transformation of Time, 1870-1950", and cite a couple of reviews. 3111 3112 The America/Chicago entry now documents the informal use of US 3113 central time in Fort Pierre, South Dakota. (Thanks to Rick 3114 McDermid, Matt Johnson, and Steve Jones.) 3115 3116 3117Release 2015g - 2015-10-01 00:39:51 -0700 3118 3119 Changes affecting future timestamps 3120 3121 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25. 3122 (Thanks to Fatih.) 3123 3124 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time. 3125 (Thanks to Alexander Krivenyshev.) 3126 3127 Fiji's 2016 fall-back transition is scheduled for January 17, not 24. 3128 (Thanks to Ken Rylander.) 3129 3130 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has 3131 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08. 3132 New zone America/Fort_Nelson. (Thanks to Matt Johnson.) 3133 3134 Changes affecting past timestamps 3135 3136 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00. 3137 3138 Changes affecting code 3139 3140 localtime no longer mishandles America/Anchorage after 2037. 3141 (Thanks to Bradley White for reporting the bug.) 3142 3143 On hosts with signed 32-bit time_t, localtime no longer mishandles 3144 Pacific/Fiji after 2038-01-16 14:00 UTC. 3145 3146 The localtime module allows the variables 'timezone', 'daylight', 3147 and 'altzone' to be in common storage shared with other modules, 3148 and declares them in case the system <time.h> does not. 3149 (Problems reported by Kees Dekker.) 3150 3151 On platforms with tm_zone, strftime.c now assumes it is not NULL. 3152 This simplifies the code and is consistent with zdump.c. 3153 (Problem reported by Christos Zoulas.) 3154 3155 Changes affecting documentation 3156 3157 The tzfile man page now documents that transition times denote the 3158 starts (not the ends) of the corresponding time periods. 3159 (Ambiguity reported by Bill Seymour.) 3160 3161 3162Release 2015f - 2015-08-10 18:06:56 -0700 3163 3164 Changes affecting future timestamps 3165 3166 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.) 3167 The abbreviation remains "KST". (Thanks to Robert Elz.) 3168 3169 Uruguay no longer observes DST. (Thanks to Steffen Thorsen 3170 and Pablo Camargo.) 3171 3172 Changes affecting past and future timestamps 3173 3174 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC. 3175 (Thanks to Roman Tudos.) 3176 3177 Changes affecting data format and code 3178 3179 zic's '-y YEARISTYPE' option is no longer documented. The TYPE 3180 field of a Rule line should now be '-'; the old values 'even', 3181 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented. 3182 Although the implementation has not changed, these features do not 3183 work in the default installation, they are not used in the data, 3184 and they are now considered obsolescent. 3185 3186 zic now checks that two rules don't take effect at the same time. 3187 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on 3188 simultaneity are now documented. 3189 3190 The two characters '%z' in a zone format now stand for the UT 3191 offset, e.g., '-07' for seven hours behind UT and '+0530' for 3192 five hours and thirty minutes ahead. This better supports time 3193 zone abbreviations conforming to POSIX.1-2001 and later. 3194 3195 Changes affecting installed data files 3196 3197 Comments for America/Halifax and America/Glace_Bay have been improved. 3198 (Thanks to Brian Inglis.) 3199 3200 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol, 3201 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller 3202 installed data files for Europe/Simferopol and Europe/Tallinn. 3203 It does not affect timestamps. (Thanks to Howard Hinnant.) 3204 3205 Changes affecting code 3206 3207 zdump and zic no longer warn about valid time zone abbreviations 3208 like '-05'. 3209 3210 Some Visual Studio 2013 warnings have been suppressed. 3211 (Thanks to Kees Dekker.) 3212 3213 'date' no longer sets the time of day and its -a, -d, -n and -t 3214 options have been removed. Long obsolescent, the implementation 3215 of these features had porting problems. Builders no longer need 3216 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H. 3217 (Thanks to Kees Dekker for pointing out the problem.) 3218 3219 Changes affecting documentation 3220 3221 The Theory file mentions naming issues earlier, as these seem to be 3222 poorly publicized (thanks to Gilmore Davidson for reporting the problem). 3223 3224 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant). 3225 3226 Mention that Herbert Samuel introduced the term "Summer Time". 3227 3228 3229Release 2015e - 2015-06-13 10:56:02 -0700 3230 3231 Changes affecting future timestamps 3232 3233 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00, 3234 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.) 3235 3236 Assume Cayman Islands will observe DST starting next year, using US rules. 3237 Although it isn't guaranteed, it is the most likely. 3238 3239 Changes affecting data format 3240 3241 The file 'iso3166.tab' now uses UTF-8, so that its entries can better 3242 spell the names of Åland Islands, Côte d'Ivoire, and Réunion. 3243 3244 Changes affecting code 3245 3246 When displaying data, tzselect converts it to the current locale's 3247 encoding if the iconv command works. (Problem reported by random832.) 3248 3249 tzselect no longer mishandles Dominica, fixing a bug introduced 3250 in Release 2014f. (Problem reported by Owen Leibman.) 3251 3252 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\". 3253 This fixes a bug introduced in Release 2014f. 3254 (Problem reported by Leonardo Chiquitto.) 3255 3256 3257Release 2015d - 2015-04-24 08:09:46 -0700 3258 3259 Changes affecting future timestamps 3260 3261 Egypt will not observe DST in 2015 and will consider canceling it 3262 permanently. For now, assume no DST indefinitely. 3263 (Thanks to Ahmed Nazmy and Tim Parenti.) 3264 3265 Changes affecting past timestamps 3266 3267 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not 3268 1966-07-01. Also, Yukon's time zone history is documented better. 3269 (Thanks to Brian Inglis and Dennis Ferguson.) 3270 3271 Change affecting past and future time zone abbreviations 3272 3273 The abbreviations for Hawaii-Aleutian standard and daylight times 3274 have been changed from HAST/HADT to HST/HDT, as per US Government 3275 Printing Office style. This affects only America/Adak since 1983, 3276 as America/Honolulu was already using the new style. 3277 3278 Changes affecting code 3279 3280 zic has some minor performance improvements. 3281 3282 3283Release 2015c - 2015-04-11 08:55:55 -0700 3284 3285 Changes affecting future timestamps 3286 3287 Egypt's spring-forward transition is at 24:00 on April's last Thursday, 3288 not 00:00 on April's last Friday. 2015's transition will therefore be on 3289 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes 3290 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.) 3291 3292 Changes affecting past timestamps 3293 3294 The following changes affect some pre-1991 Chile-related timestamps 3295 in America/Santiago, Antarctica/Palmer, and Pacific/Easter. 3296 3297 The 1910 transition was January 10, not January 1. 3298 3299 The 1918 transition was September 10, not September 1. 3300 3301 The UT -04 time observed from 1932 to 1942 is now considered to 3302 be standard time, not year-round DST. 3303 3304 Santiago observed DST (UT -03) from 1946-07-15 through 3305 1946-08-31, then reverted to standard time, then switched to -05 3306 on 1947-04-01. 3307 3308 Assume transitions before 1968 were at 00:00, since we have no data 3309 saying otherwise. 3310 3311 The spring 1988 transition was 1988-10-09, not 1988-10-02. 3312 The fall 1990 transition was 1990-03-11, not 1990-03-18. 3313 3314 Assume no UT offset change for Pacific/Easter on 1890-01-01, 3315 and omit all transitions on Pacific/Easter from 1942 through 1946 3316 since we have no data suggesting that they existed. 3317 3318 One more zone has been turned into a link, as it differed 3319 from an existing zone only for older timestamps. As usual, 3320 this change affects UT offsets in pre-1970 timestamps only. 3321 The zone's old contents have been moved to the 'backzone' file. 3322 The affected zone is America/Montreal. 3323 3324 Changes affecting commentary 3325 3326 Mention the TZUpdater tool. 3327 3328 Mention "The Time Now". (Thanks to Brandon Ramsey.) 3329 3330 3331Release 2015b - 2015-03-19 23:28:11 -0700 3332 3333 Changes affecting future timestamps 3334 3335 Mongolia will start observing DST again this year, from the last 3336 Saturday in March at 02:00 to the last Saturday in September at 00:00. 3337 (Thanks to Ganbold Tsagaankhuu.) 3338 3339 Palestine will start DST on March 28, not March 27. Also, 3340 correct the fall 2014 transition from September 26 to October 24. 3341 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.) 3342 3343 Changes affecting past timestamps 3344 3345 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a 3346 regression. (Thanks to Stuart Bishop for reporting the problem.) 3347 3348 Some more zones have been turned into links, when they differed 3349 from existing zones only for older timestamps. As usual, 3350 these changes affect UT offsets in pre-1970 timestamps only. 3351 Their old contents have been moved to the 'backzone' file. 3352 The affected zones are: America/Antigua, America/Cayman, 3353 Pacific/Midway, and Pacific/Saipan. 3354 3355 Changes affecting time zone abbreviations 3356 3357 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD". 3358 (Thanks to Hank W.) 3359 3360 Changes affecting code 3361 3362 Fix integer overflow bug in reference 'mktime' implementation. 3363 (Problem reported by Jörg Richter.) 3364 3365 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries 3366 to be used in the same executable as standard-library time_t functions. 3367 (Problems reported by Bradley White.) 3368 3369 Changes affecting commentary 3370 3371 Cite the recent Mexican decree changing Quintana Roo's time zone. 3372 (Thanks to Carlos Raúl Perasso.) 3373 3374 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.) 3375 3376 Update info about Mars time. 3377 3378 3379Release 2015a - 2015-01-29 22:35:20 -0800 3380 3381 Changes affecting future timestamps 3382 3383 The Mexican state of Quintana Roo, represented by America/Cancun, 3384 will shift from Central Time with DST to Eastern Time without DST 3385 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.) 3386 3387 Chile will not change clocks in April or thereafter; its new standard time 3388 will be its old daylight saving time. This affects America/Santiago, 3389 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.) 3390 3391 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49. 3392 (Thanks to Tim Parenti.) 3393 3394 Changes affecting past timestamps 3395 3396 Iceland observed DST in 1919 and 1921, and its 1939 fallback 3397 transition was Oct. 29, not Nov. 29. Remove incorrect data from 3398 Shanks about time in Iceland between 1837 and 1908. 3399 3400 Some more zones have been turned into links, when they differed 3401 from existing zones only for older timestamps. As usual, 3402 these changes affect UT offsets in pre-1970 timestamps only. 3403 Their old contents have been moved to the 'backzone' file. 3404 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait, 3405 and Asia/Muscat. 3406 3407 Changes affecting code 3408 3409 tzalloc now scrubs time zone abbreviations compatibly with the way 3410 that tzset always has, by replacing invalid bytes with '_' and by 3411 shortening too-long abbreviations. 3412 3413 tzselect ports to POSIX awk implementations, no longer mishandles 3414 POSIX TZ settings when GNU awk is used, and reports POSIX TZ 3415 settings to the user. (Thanks to Stefan Kuhn.) 3416 3417 Changes affecting build procedure 3418 3419 'make check' now checks for links to links in the data. 3420 One such link (for Africa/Asmera) has been fixed. 3421 (Thanks to Stephen Colebourne for pointing out the problem.) 3422 3423 Changes affecting commentary 3424 3425 The leapseconds file commentary now mentions the expiration date. 3426 (Problem reported by Martin Burnicki.) 3427 3428 Update Mexican Library of Congress URL. 3429 3430 3431Release 2014j - 2014-11-10 17:37:11 -0800 3432 3433 Changes affecting current and future timestamps 3434 3435 Turks & Caicos' switch from US eastern time to UT -04 year-round 3436 did not occur on 2014-11-02 at 02:00. It's currently scheduled 3437 for 2015-11-01 at 02:00. (Thanks to Chris Walton.) 3438 3439 Changes affecting past timestamps 3440 3441 Many pre-1989 timestamps have been corrected for Asia/Seoul and 3442 Asia/Pyongyang, based on sources for the Korean-language Wikipedia 3443 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no 3444 longer guess that Pyongyang mimicked Seoul time after World War II, 3445 as this is politically implausible. 3446 3447 Some more zones have been turned into links, when they differed 3448 from existing zones only for older timestamps. As usual, 3449 these changes affect UT offsets in pre-1970 timestamps only. 3450 Their old contents have been moved to the 'backzone' file. 3451 The affected zones are: Africa/Addis_Ababa, Africa/Asmara, 3452 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala, 3453 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and 3454 Indian/Mayotte. 3455 3456 Changes affecting commentary 3457 3458 The commentary is less enthusiastic about Shanks as a source, 3459 and is more careful to distinguish UT from UTC. 3460 3461 3462Release 2014i - 2014-10-21 22:04:57 -0700 3463 3464 Changes affecting future timestamps 3465 3466 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00. 3467 (Thanks to Ken Rylander for the heads-up.) Guess that future 3468 years will use a similar pattern. 3469 3470 A new Zone Pacific/Bougainville, for the part of Papua New Guinea 3471 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00. 3472 (Thanks to Kiley Walbom for the heads-up.) 3473 3474 Changes affecting time zone abbreviations 3475 3476 Since Belarus is not changing its clocks even though Moscow is, 3477 the time zone abbreviation in Europe/Minsk is changing from FET 3478 to its more traditional value MSK on 2014-10-26 at 01:00. 3479 (Thanks to Alexander Bokovoy for the heads-up about Belarus.) 3480 3481 The new abbreviation IDT stands for the pre-1976 use of UT +08 in 3482 Indochina, to distinguish it better from ICT (+07). 3483 3484 Changes affecting past timestamps 3485 3486 Many timestamps have been corrected for Asia/Ho_Chi_Minh before 1976 3487 (thanks to Trần Ngọc Quân for an indirect pointer to Trần Tiến Bình's 3488 authoritative book). Asia/Ho_Chi_Minh has been added to 3489 zone1970.tab, to give tzselect users in Vietnam two choices, 3490 since north and south Vietnam disagreed after our 1970 cutoff. 3491 3492 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as 3493 they differed from existing zones only for older timestamps. As 3494 usual, these changes affect pre-1970 timestamps only. Their old 3495 contents have been moved to the 'backzone' file. 3496 3497 Changes affecting code 3498 3499 The time-related library functions now set errno on failure, and 3500 some crashes in the new tzalloc-related library functions have 3501 been fixed. (Thanks to Christos Zoulas for reporting most of 3502 these problems and for suggesting fixes.) 3503 3504 If USG_COMPAT is defined and the requested timestamp is standard time, 3505 the tz library's localtime and mktime functions now set the extern 3506 variable timezone to a value appropriate for that timestamp; and 3507 similarly for ALTZONE, daylight saving time, and the altzone variable. 3508 This change is a companion to the tzname change in 2014h, and is 3509 designed to make timezone and altzone more compatible with tzname. 3510 3511 The tz library's functions now set errno to EOVERFLOW if they fail 3512 because the result cannot be represented. ctime and ctime_r now 3513 return NULL and set errno when a timestamp is out of range, rather 3514 than having undefined behavior. 3515 3516 Some bugs associated with the new 2014g functions have been fixed. 3517 This includes a bug that largely incapacitated the new functions 3518 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.) 3519 It also includes some uses of uninitialized variables after tzalloc. 3520 The new code uses the standard type 'ssize_t', which the Makefile 3521 now gives porting advice about. 3522 3523 Changes affecting commentary 3524 3525 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis). 3526 3527 3528Release 2014h - 2014-09-25 18:59:03 -0700 3529 3530 Changes affecting past timestamps 3531 3532 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28. 3533 3534 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01, 3535 not 1920-01-06. The old entry was based on a misinterpretation of Shanks. 3536 3537 Some more zones have been turned into links, when they differed 3538 from existing zones only for older timestamps. As usual, 3539 these changes affect UT offsets in pre-1970 timestamps only. 3540 Their old contents have been moved to the 'backzone' file. 3541 The affected zones are: Africa/Blantyre, Africa/Bujumbura, 3542 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi, 3543 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane. 3544 3545 Changes affecting code 3546 3547 zdump -V and -v now output gmtoff= values on all platforms, 3548 not merely on platforms defining TM_GMTOFF. 3549 3550 The tz library's localtime and mktime functions now set tzname to a value 3551 appropriate for the requested timestamp, and zdump now uses this 3552 on platforms not defining TM_ZONE, fixing a 2014g regression. 3553 (Thanks to Tim Parenti for reporting the problem.) 3554 3555 The tz library no longer sets tzname if localtime or mktime fails. 3556 3557 zdump -c no longer mishandles transitions near year boundaries. 3558 (Thanks to Tim Parenti for reporting the problem.) 3559 3560 An access to uninitialized data has been fixed. 3561 (Thanks to Jörg Richter for reporting the problem.) 3562 3563 When THREAD_SAFE is defined, the code ports to the C11 memory model. 3564 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined 3565 and two threads race to initialize data used by gmtime-like functions. 3566 (Thanks to Andy Heninger for reporting the problems.) 3567 3568 Changes affecting build procedure 3569 3570 'make check' now checks better for properly sorted data. 3571 3572 Changes affecting documentation and commentary 3573 3574 zdump's gmtoff=N output is now documented, and its isdst=D output 3575 is now documented to possibly output D values other than 0 or 1. 3576 3577 zdump -c's treatment of years is now documented to use the 3578 Gregorian calendar and Universal Time without leap seconds, 3579 and its behavior at cutoff boundaries is now documented better. 3580 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.) 3581 3582 Programs are now documented to use the proleptic Gregorian calendar. 3583 (Thanks to Alan Barrett for the suggestion.) 3584 3585 Fractional-second GMT offsets have been documented for civil time 3586 in 19th-century Chennai, Jakarta, and New York. 3587 3588 3589Release 2014g - 2014-08-28 12:31:23 -0700 3590 3591 Changes affecting future timestamps 3592 3593 Turks & Caicos is switching from US eastern time to UT -04 3594 year-round, modeled as a switch on 2014-11-02 at 02:00. 3595 [As noted in 2014j, this switch was later delayed.] 3596 3597 Changes affecting past timestamps 3598 3599 Time in Russia or the USSR before 1926 or so has been corrected by 3600 a few seconds in the following zones: Asia/Irkutsk, 3601 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi, 3602 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For 3603 Asia/Yekaterinburg the correction is a few minutes. (Thanks to 3604 Vladimir Karpinsky.) 3605 3606 The Portuguese decree of 1911-05-26 took effect on 1912-01-01. 3607 This affects 1911 timestamps in Africa/Bissau, Africa/Luanda, 3608 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912 3609 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32. 3610 (Thanks to Stephen Colebourne for pointing to the decree.) 3611 3612 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59. 3613 3614 A new file 'backzone' contains data which may appeal to 3615 connoisseurs of old timestamps, although it is out of scope for 3616 the tz database, is often poorly sourced, and contains some data 3617 that is known to be incorrect. The new file is not recommended 3618 for ordinary use and its entries are not installed by default. 3619 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and 3620 Isle of Man entries.) 3621 3622 Some more zones have been turned into links, when they differed 3623 from existing zones only for older timestamps. As usual, 3624 these changes affect UT offsets in pre-1970 timestamps only. 3625 Their old contents have been moved to the 'backzone' file. 3626 The affected zones are: Africa/Bangui, Africa/Brazzaville, 3627 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda, 3628 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo. 3629 3630 Changes affecting code 3631 3632 Unless NETBSD_INSPIRED is defined to 0, the tz library now 3633 supplies functions for creating and using objects that represent 3634 timezones. The new functions are tzalloc, tzfree, localtime_rz, 3635 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and 3636 time2posix_z. They are intended for performance: for example, 3637 localtime_rz (unlike localtime_r) is trivially thread-safe without 3638 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired 3639 functions, and to Alan Barrett and Jonathan Lennox for helping to 3640 debug the change.) 3641 3642 zdump now builds with the tz library unless USE_LTZ is defined to 0, 3643 This lets zdump use tz features even if the system library lacks them. 3644 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0 3645 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='. 3646 3647 zdump now uses localtime_rz if available, as it's significantly faster, 3648 and it can help zdump better diagnose invalid timezone names. 3649 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ 3650 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is 3651 not available, zdump now uses localtime_r and tzset if available, 3652 as this is a bit cleaner and faster than plain localtime. Compile 3653 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system 3654 lacks these two functions. 3655 3656 If THREAD_SAFE is defined to 1, the tz library is now thread-safe. 3657 Although not needed for tz's own applications, which are single-threaded, 3658 this supports POSIX better if the tz library is used in multithreaded apps. 3659 3660 Some crashes have been fixed when zdump or the tz library is given 3661 invalid or outlandish input. 3662 3663 The tz library no longer mishandles leap seconds on platforms with 3664 unsigned time_t in timezones that lack ordinary transitions after 1970. 3665 3666 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not 3667 already defined, to make it easier to configure on common platforms. 3668 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this. 3669 3670 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now 3671 assumes that reading uninitialized memory yields garbage values 3672 but does not cause other problems such as traps. 3673 3674 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now 3675 more likely to guess right for ambiguous timestamps near 3676 transitions where tm_isdst does not change. 3677 3678 If HAVE_STRFTIME_L is defined to 1, the tz library now defines 3679 strftime_l for compatibility with recent versions of POSIX. 3680 Only the C locale is supported, though. HAVE_STRFTIME_L defaults 3681 to 1 on recent POSIX versions, and to 0 otherwise. 3682 3683 tzselect -c now uses a hybrid distance measure that works better 3684 in Africa. (Thanks to Alan Barrett for noting the problem.) 3685 3686 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used, 3687 or when time_tz is defined. 3688 3689 When HAVE_UTMPX_H is set the 'date' command now builds on systems 3690 whose <utmpx.h> file does not define WTMPX_FILE, and when setting 3691 the date it updates the wtmpx file if _PATH_WTMPX is defined. 3692 This affects GNU/Linux and similar systems. 3693 3694 For easier maintenance later, some C code has been simplified, 3695 some lint has been removed, and the code has been tweaked so that 3696 plain 'make' is more likely to work. 3697 3698 The C type 'bool' is now used for boolean values, instead of 'int'. 3699 3700 The long-obsolete LOCALE_HOME code has been removed. 3701 3702 The long-obsolete 'gtime' function has been removed. 3703 3704 Changes affecting build procedure 3705 3706 'zdump' no longer links in ialloc.o, as it's not needed. 3707 3708 'make check_time_t_alternatives' no longer assumes GNU diff. 3709 3710 Changes affecting distribution tarballs 3711 3712 The files checktab.awk and zoneinfo2tdf.pl are now distributed in 3713 the tzdata tarball instead of the tzcode tarball, since they help 3714 maintain the data. The NEWS and Theory files are now also 3715 distributed in the tzdata tarball, as they're relevant for data. 3716 (Thanks to Alan Barrett for pointing this out.) Also, the 3717 leapseconds.awk file is no longer distributed in the tzcode 3718 tarball, since it belongs in the tzdata tarball (where 2014f 3719 inadvertently also distributed it). 3720 3721 Changes affecting documentation and commentary 3722 3723 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for 3724 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms 3725 for debugging it.) 3726 3727 The man pages have been updated to use function prototypes, 3728 to document thread-safe variants like localtime_r, and to document 3729 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and 3730 mktime_z. 3731 3732 The fields in Link lines have been renamed to be more descriptive 3733 and more like the parameters of 'ln'. LINK-FROM has become TARGET, 3734 and LINK-TO has become LINK-NAME. 3735 3736 tz-link.htm mentions the IETF's tzdist working group; Windows 3737 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab. 3738 3739 Some broken URLs have been fixed in the commentary. (Thanks to 3740 Lester Caine.) 3741 3742 Commentary about Philippines DST has been updated, and commentary 3743 on pre-1970 time in India has been added. 3744 3745 3746Release 2014f - 2014-08-05 17:42:36 -0700 3747 3748 Changes affecting future timestamps 3749 3750 Russia will subtract an hour from most of its time zones on 2014-10-26 3751 at 02:00 local time. (Thanks to Alexander Krivenyshev.) 3752 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky 3753 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug 3754 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast 3755 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic 3756 (Europe/Samara) are not changing their clocks. The changed zones are 3757 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd, 3758 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk, 3759 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga, 3760 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours 3761 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected, 3762 but not its UTC offset. Two zones are added: Asia/Chita (split 3763 from Asia/Yakutsk, and also with two hours subtracted) and 3764 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour 3765 subtracted). (Thanks to Tim Parenti for much of the above.) 3766 3767 Changes affecting time zone abbreviations 3768 3769 Australian eastern time zone abbreviations are now AEST/AEDT not EST, 3770 and similarly for the other Australian zones. That is, for eastern 3771 standard and daylight saving time the abbreviations are AEST and AEDT 3772 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT, 3773 and AWST/AWDT are now used instead of the former CST, CWST, and WST. 3774 This change does not affect UT offsets, only time zone abbreviations. 3775 (Thanks to Rich Tibbett and many others.) 3776 3777 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07) 3778 effective 2014-10-26 at 02:00 local time. 3779 3780 The time zone abbreviation for Xinjiang Time (observed in Ürümqi) 3781 has been changed from URUT to XJT. (Thanks to Luther Ma.) 3782 3783 Prefer MSK/MSD for Moscow time in Russia, even in other cities. 3784 Similarly, prefer EET/EEST for eastern European time in Russia. 3785 3786 Change time zone abbreviations in (western) Samoa to use "ST" and 3787 "DT" suffixes, as this is more likely to match common practice. 3788 Prefix "W" to (western) Samoa time when its standard-time offset 3789 disagrees with that of American Samoa. 3790 3791 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone. 3792 3793 Time zone abbreviations have been updated for Japan's two time 3794 zones used 1896-1937. JWST now stands for Western Standard 3795 Time, and JCST for Central Standard Time (formerly this was CJT). 3796 These abbreviations are now used for time in Korea, Taiwan, 3797 and Sakhalin while controlled by Japan. 3798 3799 Changes affecting past timestamps 3800 3801 China's five zones have been simplified to two, since the post-1970 3802 differences in the other three seem to have been imaginary. The 3803 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been 3804 removed; backwards-compatibility links still work, albeit with 3805 different behaviors for timestamps before May 1980. Asia/Urumqi's 3806 1980 transition to UT +08 has been removed, so that it is now at 3807 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl; 3808 Treindl sent helpful translations of two papers by Guo Qingsheng.) 3809 3810 Some zones have been turned into links, when they differed from existing 3811 zones only for older UT offsets where data entries were likely invented. 3812 These changes affect UT offsets in pre-1970 timestamps only. This is 3813 similar to the change in release 2013e, except this time for western 3814 Africa. The affected zones are: Africa/Bamako, Africa/Banjul, 3815 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome, 3816 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and 3817 Atlantic/St_Helena. This also affects the backwards-compatibility 3818 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne, 3819 Tim Parenti, and David Patte for reporting problems in earlier 3820 versions of this change.) 3821 3822 Asia/Shanghai's pre-standard-time UT offset has been changed from 3823 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its 3824 transition to standard time has been changed from 1928 to 1901. 3825 3826 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01, 3827 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945. 3828 In 1946 it observed DST from 05-15 through 09-30; in 1947 3829 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30. 3830 (Thanks to Yu-Cheng Chuang.) 3831 3832 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950. 3833 3834 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not 3835 10-03 at 00:00. (Thanks to Konstantin Hyppönen.) 3836 3837 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the 3838 period from 1911 to 1950. 3839 3840 Pacific/Chatham has been changed to New Zealand standard time plus 3841 45 minutes for the period before 1957, reflecting a 1956 remark in 3842 the New Zealand parliament. 3843 3844 Europe/Budapest has several pre-1946 corrections: in 1918 the transition 3845 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in 3846 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08 3847 not 04-06 at 02:00; and there was no DST in 1920. 3848 3849 Africa/Accra is now assumed to have observed DST from 1920 through 1935. 3850 3851 Time in Russia before 1927 or so has been corrected by a few seconds in 3852 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi, 3853 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and 3854 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0 3855 point. (Thanks to Vladimir Karpinsky for the Moscow changes.) 3856 3857 Changes affecting data format 3858 3859 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data. 3860 The new file's extended format allows multiple country codes per zone. 3861 The older file is still installed but is deprecated; its format is 3862 not changing and it will still be distributed for a while, but new 3863 applications should use the new file. 3864 3865 The new file format simplifies maintenance of obscure locations. 3866 To test this, it adds coverage for the Crozet Islands and the 3867 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.) 3868 3869 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8. 3870 It is still ASCII now, but commentary about the switch has been added. 3871 The new file 'zone1970.tab' already uses UTF-8. 3872 3873 Changes affecting code 3874 3875 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE 3876 is defined. (Thanks to Elliott Hughes for reporting the problem.) 3877 3878 'zic' no longer mishandles input when ignoring case in locales that 3879 are not compatible with English, e.g., unibyte Turkish locales when 3880 compiled with HAVE_GETTEXT. 3881 3882 Error diagnostics of 'zic' and 'yearistype' have been reworded so that 3883 they no longer use ASCII '-' as if it were a dash. 3884 3885 'zic' now rejects output file names that contain '.' or '..' components. 3886 (Thanks to Tim Parenti for reporting the problem.) 3887 3888 'zic -v' now warns about output file names that do not follow 3889 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur 3890 David Olson for starting the ball rolling on this.) 3891 3892 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0. 3893 3894 Changes affecting build procedure 3895 3896 'zic' no longer links in localtime.o and asctime.o, as they're not needed. 3897 (Thanks to John Cochran.) 3898 3899 Changes affecting documentation and commentary 3900 3901 The 'Theory' file documents legacy names, the longstanding 3902 exceptions to the POSIX-inspired file name rules. 3903 3904 The 'zic' documentation clarifies the role of time types when 3905 interpreting dates. (Thanks to Arthur David Olson.) 3906 3907 Documentation and commentary now prefer UTF-8 to US-ASCII, 3908 allowing the use of proper accents in foreign words and names. 3909 Code and data have not changed because of this. (Thanks to 3910 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug 3911 this.) 3912 3913 Non-HTML documentation and commentary now use plain-text URLs instead of 3914 HTML insertions, and are more consistent about bracketing URLs when they 3915 are not already surrounded by white space. (Thanks to suggestions by 3916 Steffen Nurpmeso.) 3917 3918 There is new commentary about Xujiahui Observatory, the five time-zone 3919 project in China from 1918 to 1949, timekeeping in Japanese-occupied 3920 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the 3921 warlord Jin Shuren in the data. 3922 3923 Commentary about the coverage of each Russian zone has been standardized. 3924 (Thanks to Tim Parenti.) 3925 3926 There is new commentary about contemporary timekeeping in Ethiopia. 3927 3928 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed. 3929 3930 There is new commentary about time in Poland in 1919. 3931 3932 Proper credit has been given to DST inventor George Vernon Hudson. 3933 3934 Commentary about time in Metlakatla, AK and Resolute, NU has been 3935 improved, with a new source for the former. 3936 3937 In zone.tab, Pacific/Easter no longer mentions Salas y Gómez, as it 3938 is uninhabited. 3939 3940 Commentary about permanent Antarctic bases has been updated. 3941 3942 Several typos have been corrected. (Thanks to Tim Parenti for 3943 contributing some of these fixes.) 3944 3945 tz-link.htm now mentions the JavaScript libraries Moment Timezone, 3946 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up 3947 from Matt Johnson.) Also, it mentions the Go 'latlong' package. 3948 (Thanks to a heads-up from Dirkjan Ochtman.) 3949 3950 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998 3951 have been removed. These obsolescent US Naval Observatory entries were no 3952 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.) 3953 3954 3955Release 2014e - 2014-06-12 21:53:52 -0700 3956 3957 Changes affecting near-future timestamps 3958 3959 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00. 3960 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily 3961 switch to standard time at 24:00 the last Thursday before Ramadan, and 3962 back to DST at 00:00 the first Friday after Ramadan. 3963 3964 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks 3965 to Milamber Space Network.) Guess that from 2015 on Morocco will 3966 temporarily switch to standard time at 03:00 the last Saturday before 3967 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan. 3968 3969 Changes affecting past timestamps 3970 3971 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of 3972 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo 3973 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time 3974 in 1991. (Thanks to Hank W. for reporting the problems.) 3975 3976 Changes affecting commentary 3977 3978 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the 3979 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and 3980 removes stale pointers to World Time Explorer and WORLDTIME. 3981 3982 3983Release 2014d - 2014-05-27 21:34:40 -0700 3984 3985 Changes affecting code 3986 3987 zic no longer generates files containing timestamps before the Big Bang. 3988 This works around GNOME glib bug 878 3989 <https://gitlab.gnome.org/GNOME/glib/issues/878> 3990 (Thanks to Leonardo Chiquitto for reporting the bug, and to 3991 Arthur David Olson and James Cloos for suggesting improvements to the fix.) 3992 3993 Changes affecting documentation 3994 3995 tz-link.htm now mentions GNOME. 3996 3997 3998Release 2014c - 2014-05-13 07:44:13 -0700 3999 4000 Changes affecting near-future timestamps 4001 4002 Egypt observes DST starting 2014-05-15 at 24:00. 4003 (Thanks to Ahmad El-Dardiry and Gunther Vermier.) 4004 Details have not been announced, except that DST will not be observed 4005 during Ramadan. Guess that DST will stop during the same Ramadan dates as 4006 Morocco, and that Egypt's future spring and fall transitions will be the 4007 same as 2010 when it last observed DST, namely April's last Friday at 4008 00:00 to September's last Thursday at 23:00 standard time. Also, guess 4009 that Ramadan transitions will be at 00:00 standard time. 4010 4011 Changes affecting code 4012 4013 zic now generates transitions for minimum time values, eliminating guesswork 4014 when handling low-valued timestamps. (Thanks to Arthur David Olson.) 4015 4016 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.) 4017 4018 Changes affecting commentary and documentation 4019 4020 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.) 4021 4022 4023Release 2014b - 2014-03-24 21:28:50 -0700 4024 4025 Changes affecting near-future timestamps 4026 4027 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time. 4028 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU. 4029 4030 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and 4031 Bengt-Inge Larsson.) This is currently an approximation; a better version 4032 will require the zic and localtime fixes mentioned below, and the plan is 4033 to wait for a while until at least the zic fixes propagate. 4034 4035 Changes affecting code 4036 4037 'zic' and 'localtime' no longer reject locations needing four transitions 4038 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).) 4039 Also, 'zic' avoids some unlikely failures due to integer overflow. 4040 4041 Changes affecting build procedure 4042 4043 'make check' now detects Rule lines defined but never used. 4044 The NZAQ rules, an instance of this problem, have been removed. 4045 4046 Changes affecting commentary and documentation 4047 4048 Fix Tuesday/Thursday typo in description of time in Israel. 4049 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.) 4050 4051 Microsoft Windows 8.1 doesn't support tz database names. (Thanks 4052 to Donald MacQueen.) Instead, the Microsoft Windows Store app 4053 library supports them. 4054 4055 Add comments about Johnston Island time in the 1960s. 4056 (Thanks to Lyle McElhaney.) 4057 4058 Morocco's 2014 DST start will be as predicted. 4059 (Thanks to Sebastien Willemijns.) 4060 4061 4062Release 2014a - 2014-03-07 23:30:29 -0800 4063 4064 Changes affecting near-future timestamps 4065 4066 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for 4067 the heads-up, and to Tim Parenti for simplifying the update.) 4068 4069 Changes affecting past timestamps 4070 4071 Fiji ended DST on 2014-01-19 at 02:00, not the previously scheduled 03:00. 4072 (Thanks to Steffen Thorsen.) 4073 4074 Ukraine switched from Moscow to Eastern European time on 1990-07-01 4075 (not 1992-01-01), and observed DST during the entire next winter. 4076 (Thanks to Vladimir in Moscow via Alois Treindl.) 4077 4078 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03. 4079 (Thanks to Avigdor Finkelstein.) 4080 4081 Changes affecting code 4082 4083 A uninitialized-storage bug in 'localtime' has been fixed. 4084 (Thanks to Logan Chien.) 4085 4086 Changes affecting the build procedure 4087 4088 The settings for 'make check_web' now default to Ubuntu 13.10. 4089 4090 Changes affecting commentary and documentation 4091 4092 The boundary of the US Pacific time zone is given more accurately. 4093 (Thanks to Alan Mintz.) 4094 4095 Chile's 2014 DST will be as predicted. (Thanks to José Miguel Garrido.) 4096 4097 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Raúl Perasso.) 4098 4099 Better descriptions of countries with same time zone history as 4100 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.) 4101 4102 Several changes affect tz-link.htm, the main web page. 4103 4104 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to 4105 David Braverman). 4106 4107 Mention xCal (Internet RFC 6321) and jCal. 4108 4109 Microsoft has some support for tz database names. 4110 4111 CLDR data formats include both XML and JSON. 4112 4113 Mention Maggiolo's map of solar vs standard time. 4114 (Thanks to Arthur David Olson.) 4115 4116 Mention TZ4Net. (Thanks to Matt Johnson.) 4117 4118 Mention the timezone-olson Haskell package. 4119 4120 Mention zeitverschiebung.net. (Thanks to Martin Jäger.) 4121 4122 Remove moribund links to daylight-savings-time.info and to 4123 Simple Timer + Clocks. 4124 4125 Update two links. (Thanks to Oscar van Vlijmen.) 4126 4127 Fix some formatting glitches, e.g., remove random newlines from 4128 abbr elements' title attributes. 4129 4130 4131Release 2013i - 2013-12-17 07:25:23 -0800 4132 4133 Changes affecting near-future timestamps: 4134 4135 Jordan switches back to standard time at 00:00 on December 20, 2013. 4136 The 2006-2011 transition schedule is planned to resume in 2014. 4137 (Thanks to Steffen Thorsen.) 4138 4139 Changes affecting past timestamps: 4140 4141 In 2004, Cuba began DST on March 28, not April 4. 4142 (Thanks to Steffen Thorsen.) 4143 4144 Changes affecting code 4145 4146 The compile-time flag NOSOLAR has been removed, as nowadays the 4147 benefit of slightly shrinking runtime table size is outweighed by the 4148 cost of disallowing potential future updates that exceed old limits. 4149 4150 Changes affecting documentation and commentary 4151 4152 The files solar87, solar88, and solar89 are no longer distributed. 4153 They were a negative experiment - that is, a demonstration that 4154 tz data can represent solar time only with some difficulty and error. 4155 Their presence in the distribution caused confusion, as Riyadh 4156 civil time was generally not solar time in those years. 4157 4158 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.) 4159 4160 4161Release 2013h - 2013-10-25 15:32:32 -0700 4162 4163 Changes affecting current and future timestamps: 4164 4165 Libya has switched its UT offset back to +02 without DST, instead 4166 of +01 with DST. (Thanks to Even Scharning.) 4167 4168 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules. 4169 (Thanks to Gwillim Law.) 4170 4171 Changes affecting future timestamps: 4172 4173 Acre and (we guess) western Amazonas will switch from UT -04 to -05 4174 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe. 4175 (Thanks to Steffen Thorsen.) 4176 4177 Add entries for DST transitions in Morocco in the year 2038. 4178 This avoids some year-2038 glitches introduced in 2013g. 4179 (Thanks to Yoshito Umaoka for reporting the problem.) 4180 4181 Changes affecting API 4182 4183 The 'tzselect' command no longer requires the 'select' command, 4184 and should now work with /bin/sh on more platforms. It also works 4185 around a bug in BusyBox awk before version 1.21.0. (Thanks to 4186 Patrick 'P. J.' McDermott and Alan Barrett.) 4187 4188 Changes affecting code 4189 4190 Fix localtime overflow bugs with 32-bit unsigned time_t. 4191 4192 zdump no longer assumes sscanf returns maximal values on overflow. 4193 4194 Changes affecting the build procedure 4195 4196 The builder can specify which programs to use, if any, instead of 4197 'ar' and 'ranlib', and libtz.a is now built locally before being 4198 installed. (Thanks to Michael Forney.) 4199 4200 A dependency typo in the 'zdump' rule has been fixed. 4201 (Thanks to Andrew Paprocki.) 4202 4203 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f' 4204 work as specified by POSIX.2-1992 or later; this is portable nowadays. 4205 4206 'make clean' no longer removes 'leapseconds', since it's 4207 host-independent and is part of the distribution. 4208 4209 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed. 4210 4211 Changes affecting documentation and commentary 4212 4213 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol 4214 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle). 4215 4216 Update URLs in tz-link page. Add URLs for Microsoft Windows, since 4217 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no 4218 longer maintained) and for old advisories. SOFA now does C. 4219 4220Release 2013g - 2013-09-30 21:08:26 -0700 4221 4222 Changes affecting current and near-future timestamps 4223 4224 Morocco now observes DST from the last Sunday in March to the last 4225 Sunday in October, not April to September respectively. (Thanks 4226 to Steffen Thorsen.) 4227 4228 Changes affecting 'zic' 4229 4230 'zic' now runs on platforms that lack both hard links and symlinks. 4231 (Thanks to Theo Veenker for reporting the problem, for MinGW.) 4232 Also, fix some bugs on platforms that lack hard links but have symlinks. 4233 4234 'zic -v' again warns that Asia/Tehran has no POSIX environment variable 4235 to predict the far future, fixing a bug introduced in 2013e. 4236 4237 Changes affecting the build procedure 4238 4239 The 'leapseconds' file is again put into the tzdata tarball. 4240 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to 4241 Matt Burgess and Ian Abbott.) The timestamps of these and other 4242 dependent files in tarballs are adjusted more consistently. 4243 4244 Changes affecting documentation and commentary 4245 4246 The README file is now part of the data tarball as well as the code. 4247 It now states that files are public domain unless otherwise specified. 4248 (Thanks to Andrew Main (Zefram) for asking for clarifications.) 4249 Its details about the 1989 release moved to a place of honor near 4250 the end of NEWS. 4251 4252 4253Release 2013f - 2013-09-24 23:37:36 -0700 4254 4255 Changes affecting near-future timestamps 4256 4257 Tocantins will very likely not observe DST starting this spring. 4258 (Thanks to Steffen Thorsen.) 4259 4260 Jordan will likely stay at UT +03 indefinitely, and will not fall 4261 back this fall. 4262 4263 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.) 4264 4265 Changes affecting API 4266 4267 The types of the global variables 'timezone' and 'altzone' (if present) 4268 have been changed back to 'long'. This is required for 'timezone' 4269 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11. 4270 These variables were originally 'long' in the tz code, but were 4271 mistakenly changed to 'time_t' in 1987; nobody reported the 4272 incompatibility until now. The difference matters on x32, where 4273 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.) 4274 4275 Changes affecting the build procedure 4276 4277 Avoid long strings in leapseconds.awk to work around a mawk bug. 4278 (Thanks to Cyril Baurand.) 4279 4280 Changes affecting documentation and commentary 4281 4282 New file 'NEWS' that contains release notes like this one. 4283 4284 Paraguay's law does not specify DST transition time; 00:00 is customary. 4285 (Thanks to Waldemar Villamayor-Venialbo.) 4286 4287 Minor capitalization fixes. 4288 4289 Changes affecting version-control only 4290 4291 The experimental GitHub repository now contains annotated and 4292 signed tags for recent releases, e.g., '2013e' for Release 2013e. 4293 Releases are tagged starting with 2012e; earlier releases were 4294 done differently, and tags would either not have a simple name or 4295 not exactly match what was released. 4296 4297 'make set-timestamps' is now simpler and a bit more portable. 4298 4299 4300Release 2013e - 2013-09-19 23:50:04 -0700 4301 4302 Changes affecting near-future timestamps 4303 4304 This year Fiji will start DST on October 27, not October 20. 4305 (Thanks to David Wheeler for the heads-up.) For now, guess that 4306 Fiji will continue to spring forward the Sunday before the fourth 4307 Monday in October. 4308 4309 Changes affecting current and future time zone abbreviations 4310 4311 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian 4312 time zone abbreviations since 1932. (Thanks to George Ziegler, 4313 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and 4314 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura, 4315 Asia/Makassar, and Asia/Pontianak. 4316 4317 Use ART (UT -03, standard time), rather than WARST (also -03, but 4318 daylight saving time) for San Luis, Argentina since 2009. 4319 4320 Changes affecting Godthåb timestamps after 2037 if version mismatch 4321 4322 Allow POSIX-like TZ strings where the transition time's hour can 4323 range from -167 through 167, instead of the POSIX-required 0 4324 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the 4325 new Fiji rules. This is a more compact way to represent 4326 far-future timestamps for America/Godthab, America/Santiago, 4327 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem, 4328 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by 4329 this change. (Derived from a suggestion by Arthur David Olson.) 4330 4331 Allow POSIX-like TZ strings where daylight saving time is in 4332 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western 4333 Argentina Summer Time all year. This supports a more compact way 4334 to represent the 2013d data for America/Argentina/San_Luis. 4335 Because of the change for San Luis noted above this change does not 4336 affect the current data. (Thanks to Andrew Main (Zefram) for 4337 suggestions that improved this change.) 4338 4339 Where these two TZ changes take effect, there is a minor extension 4340 to the tz file format in that it allows new values for the 4341 embedded TZ-format string, and the tz file format version number 4342 has therefore been increased from 2 to 3 as a precaution. 4343 Version-2-based client code should continue to work as before for 4344 all timestamps before 2038. Existing version-2-based client code 4345 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format 4346 files, and typically works in practice even for timestamps after 4347 2037; the only known exception is America/Godthab. 4348 4349 Changes affecting timestamps before 1970 4350 4351 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects 4352 some errors before 1947. 4353 4354 Some zones have been turned into links, when they differ from existing 4355 zones only in older data entries that were likely invented or that 4356 differ only in LMT or transitions from LMT. These changes affect 4357 only timestamps before 1943. The affected zones are: 4358 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica, 4359 America/Grenada, America/Guadeloupe, America/Marigot, 4360 America/Montserrat, America/St_Barthelemy, America/St_Kitts, 4361 America/St_Lucia, America/St_Thomas, America/St_Vincent, 4362 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for 4363 confirming that the old Europe/Vaduz zone was wrong and the new 4364 link is better for WWII-era times.) 4365 4366 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects 4367 America/Cayman, America/Jamaica and America/Grand_Turk timestamps 4368 from 1890 to 1912. 4369 4370 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46. 4371 This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks 4372 to Alois Treindl.) 4373 4374 Change the date of the circa-1850 Zurich transition from 1849-09-12 4375 to 1853-07-16, overriding Shanks with data from Messerli about 4376 postal and telegraph time in Switzerland. 4377 4378 Changes affecting time zone abbreviations before 1970 4379 4380 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932, 4381 as Jakarta was called Batavia back then. 4382 4383 Changes affecting API 4384 4385 The 'zic' command now outputs a dummy transition when far-future 4386 data can't be summarized using a TZ string, and uses a 402-year 4387 window rather than a 400-year window. For the current data, this 4388 affects only the Asia/Tehran file. It does not affect any of the 4389 timestamps that this file represents, so zdump outputs the same 4390 information as before. (Thanks to Andrew Main (Zefram).) 4391 4392 The 'date' command has a new '-r' option, which lets you specify 4393 the integer time to display, a la FreeBSD. 4394 4395 The 'tzselect' command has two new options '-c' and '-n', which lets you 4396 select a zone based on latitude and longitude. 4397 4398 The 'zic' command's '-v' option now warns about constructs that 4399 require the new version-3 binary file format. (Thanks to Arthur 4400 David Olson for the suggestion.) 4401 4402 Support for floating-point time_t has been removed. 4403 It was always dicey, and POSIX no longer requires it. 4404 (Thanks to Eric Blake for suggesting to the POSIX committee to 4405 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy 4406 Heninger, Arthur David Olson, and Alois Treindl, for reporting 4407 bugs and elucidating some of the corners of the old floating-point 4408 implementation.) 4409 4410 The signatures of 'offtime', 'timeoff', and 'gtime' have been 4411 changed back to the old practice of using 'long' to represent UT 4412 offsets. This had been inadvertently and mistakenly changed to 4413 'int_fast32_t'. (Thanks to Christos Zoulas.) 4414 4415 The code avoids undefined behavior on integer overflow in some 4416 more places, including gmtime, localtime, mktime and zdump. 4417 4418 Changes affecting the zdump utility 4419 4420 zdump now outputs "UT" when referring to Universal Time, not "UTC". 4421 "UTC" does not make sense for timestamps that predate the introduction 4422 of UTC, whereas "UT", a more generic term, does. (Thanks to Steve Allen 4423 for clarifying UT vs UTC.) 4424 4425 Data changes affecting behavior of tzselect and similar programs 4426 4427 Country code BQ is now called the more common name "Caribbean Netherlands" 4428 rather than the more official "Bonaire, St Eustatius & Saba". 4429 4430 Remove from zone.tab the names America/Montreal, America/Shiprock, 4431 and Antarctica/South_Pole, as they are equivalent to existing 4432 same-country-code zones for post-1970 timestamps. The data entries for 4433 these names are unchanged, so the names continue to work as before. 4434 4435 Changes affecting code internals 4436 4437 zic -c now runs way faster on 64-bit hosts when given large numbers. 4438 4439 zic now uses vfprintf to avoid allocating and freeing some memory. 4440 4441 tzselect now computes the list of continents from the data, 4442 rather than have it hard-coded. 4443 4444 Minor changes pacify GCC 4.7.3 and GCC 4.8.1. 4445 4446 Changes affecting the build procedure 4447 4448 The 'leapseconds' file is now generated automatically from a 4449 new file 'leap-seconds.list', which is a copy of 4450 <ftp://ftp.nist.gov/pub/time/leap-seconds.list> 4451 A new source file 'leapseconds.awk' implements this. 4452 The goal is simplification of the future maintenance of 'leapseconds'. 4453 4454 When building the 'posix' or 'right' subdirectories, if the 4455 subdirectory would be a copy of the default subdirectory, it is 4456 now made a symbolic link if that is supported. This saves about 4457 2 MB of file system space. 4458 4459 The links America/Shiprock and Antarctica/South_Pole have been 4460 moved to the 'backward' file. This affects only nondefault builds 4461 that omit 'backward'. 4462 4463 Changes affecting version-control only 4464 4465 .gitignore now ignores 'date'. 4466 4467 Changes affecting documentation and commentary 4468 4469 Changes to the 'tzfile' man page 4470 4471 It now mentions that the binary file format may be extended in 4472 future versions by appending data. 4473 4474 It now refers to the 'zdump' and 'zic' man pages. 4475 4476 Changes to the 'zic' man page 4477 4478 It lists conditions that elicit a warning with '-v'. 4479 4480 It says that the behavior is unspecified when duplicate names 4481 are given, or if the source of one link is the target of another. 4482 4483 Its examples are updated to match the latest data. 4484 4485 The definition of white space has been clarified slightly. 4486 (Thanks to Michael Deckers.) 4487 4488 Changes to the 'Theory' file 4489 4490 There is a new section about the accuracy of the tz database, 4491 describing the many ways that errors can creep in, and 4492 explaining why so many of the pre-1970 timestamps are wrong or 4493 misleading (thanks to Steve Allen, Lester Caine, and Garrett 4494 Wollman for discussions that contributed to this). 4495 4496 The 'Theory' file describes LMT better (this follows a 4497 suggestion by Guy Harris). 4498 4499 It refers to the 2013 edition of POSIX rather than the 2004 edition. 4500 4501 It's mentioned that excluding 'backward' should not affect the 4502 other data, and it suggests at least one zone.tab name per 4503 inhabited country (thanks to Stephen Colebourne). 4504 4505 Some longstanding restrictions on names are documented, e.g., 4506 'America/New_York' precludes 'America/New_York/Bronx'. 4507 4508 It gives more reasons for the 1970 cutoff. 4509 4510 It now mentions which time_t variants are supported, such as 4511 signed integer time_t. (Thanks to Paul Goyette for reporting 4512 typos in an experimental version of this change.) 4513 4514 (Thanks to Philip Newton for correcting typos in these changes.) 4515 4516 Documentation and commentary is more careful to distinguish UT in 4517 general from UTC in particular. (Thanks to Steve Allen.) 4518 4519 Add a better source for the Zurich 1894 transition. 4520 (Thanks to Pierre-Yves Berger.) 4521 4522 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.) 4523 4524 4525Release 2013d - 2013-07-05 07:38:01 -0700 4526 4527 Changes affecting future timestamps: 4528 4529 Morocco's midsummer transitions this year are July 7 and August 10, 4530 not July 9 and August 8. (Thanks to Andrew Paprocki.) 4531 4532 Israel now falls back on the last Sunday of October. 4533 (Thanks to Ephraim Silverberg.) 4534 4535 Changes affecting past timestamps: 4536 4537 Specify Jerusalem's location more precisely; this changes the pre-1880 4538 times by 2 s. 4539 4540 Changing affecting metadata only: 4541 4542 Fix typos in the entries for country codes BQ and SX. 4543 4544 Changes affecting code: 4545 4546 Rework the code to fix a bug with handling Australia/Macquarie on 4547 32-bit hosts (thanks to Arthur David Olson). 4548 4549 Port to platforms like NetBSD, where time_t can be wider than long. 4550 4551 Add support for testing time_t types other than the system's. 4552 Run 'make check_time_t_alternatives' to try this out. 4553 Currently, the tests fail for unsigned time_t; 4554 this should get fixed at some point. 4555 4556 Changes affecting documentation and commentary: 4557 4558 Deemphasize the significance of national borders. 4559 4560 Update the zdump man page. 4561 4562 Remove obsolete NOID comment (thanks to Denis Excoffier). 4563 4564 Update several URLs and comments in the web pages. 4565 4566 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler). 4567 4568 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka). 4569 4570 4571Release 2013c - 2013-04-19 16:17:40 -0700 4572 4573 Changes affecting current and future timestamps: 4574 4575 Palestine observed DST starting March 29, 2013. (Thanks to 4576 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST, 4577 with the predicted rules being the last Thursday in March at 24:00 4578 to the first Friday on or after September 21 at 01:00. 4579 4580 Assume that the recent change to Paraguay's DST rules is permanent, 4581 by moving the end of DST to the 4th Sunday in March every year. 4582 (Thanks to Carlos Raúl Perasso.) 4583 4584 Changes affecting past timestamps: 4585 4586 Fix some historical data for Palestine to agree with that of 4587 timeanddate.com, as follows: 4588 4589 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not 4590 00:00 Apr 1. 4591 4592 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not 4593 02:00. 4594 4595 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27. 4596 4597 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2. 4598 4599 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01. 4600 4601 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00. 4602 4603 Fix times of habitation for Macquarie to agree with the Tasmania 4604 Parks & Wildlife Service history, which indicates that permanent 4605 habitation was 1899-1919 and 1948 on. 4606 4607 Changing affecting metadata only: 4608 4609 Macquarie Island is politically part of Australia, not Antarctica. 4610 (Thanks to Tobias Conradi.) 4611 4612 Sort Macquarie more consistently with other parts of Australia. 4613 (Thanks to Tim Parenti.) 4614 4615 4616Release 2013b - 2013-03-10 22:33:40 -0700 4617 4618 Changes affecting current and future timestamps: 4619 4620 Haiti uses US daylight-saving rules this year, and presumably future years. 4621 This changes timestamps starting today. (Thanks to Steffen Thorsen.) 4622 4623 Paraguay will end DST on March 24 this year. 4624 (Thanks to Steffen Thorsen.) For now, assume it's just this year. 4625 4626 Morocco does not observe DST during Ramadan; 4627 try to predict Ramadan in Morocco as best we can. 4628 (Thanks to Erik Homoet for the heads-up.) 4629 4630 Changes affecting commentary: 4631 4632 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS. 4633 Update URL for Solaris. Mention Internet RFC 6557. 4634 Update Internet RFCs 2445->5545, 2822->5322. 4635 Switch from FTP to HTTP for Internet RFCs. 4636 4637 4638Release 2013a - 2013-02-27 09:20:35 -0800 4639 4640 Change affecting binary data format: 4641 4642 The zone offset at the end of version-2-format zone files is now 4643 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.) 4644 4645 Changes affecting current and future timestamps: 4646 4647 Chile's 2013 rules, and we guess rules for 2014 and later, will be 4648 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC. 4649 (Thanks to Steffen Thorsen and Robert Elz.) 4650 4651 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen. 4652 (Thanks to Tobias Conradi and Arthur David Olson.) 4653 4654 Many changes affect historical timestamps before 1940. 4655 These were deduced from: Milne J. Civil time. Geogr J. 1899 4656 Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>. 4657 4658 Changes affecting the code: 4659 4660 Fix zic bug that mishandled Egypt's 2010 changes (this also affected 4661 the data). (Thanks to Arthur David Olson.) 4662 4663 Fix localtime bug when time_t is unsigned and data files were generated 4664 by a signed time_t system. (Thanks to Doug Bailey for reporting and 4665 to Arthur David Olson for fixing.) 4666 4667 Allow the email address for bug reports to be set by the packager. 4668 The default is tz@iana.org, as before. (Thanks to Joseph S. Myers.) 4669 4670 Update HTML checking to be compatible with Ubuntu 12.10. 4671 4672 Check that files are a safe subset of ASCII. At some point we may 4673 relax this requirement to a safe subset of UTF-8. Without the 4674 check, some non-UTF-8 encodings were leaking into the distribution. 4675 4676 Commentary changes: 4677 4678 Restore a comment about copyright notices that was inadvertently deleted. 4679 (Thanks to Arthur David Olson.) 4680 4681 Improve the commentary about which districts observe what times 4682 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson.) 4683 4684 Add web page links to tz.js. 4685 4686 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.) 4687 4688 4689Release 2012j - 2012-11-12 18:34:49 -0800 4690 4691 Libya moved to CET this weekend, but with DST planned next year. 4692 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.) 4693 4694 Signatures now have the extension .asc, not .sign, as that's more 4695 standard. (Thanks to Phil Pennock.) 4696 4697 The output of 'zdump --version', and of 'zic --version', now 4698 uses a format that is more typical for --version. 4699 (Thanks to Joseph S. Myers.) 4700 4701 The output of 'tzselect --help', 'zdump --help', and 'zic --help' 4702 now uses tz@iana.org rather than the old elsie address. 4703 4704 zic -v now complains about abbreviations that are less than 3 4705 or more than 6 characters, as per POSIX. Formerly, it checked 4706 for abbreviations that were more than 3. 4707 4708 'make public' no longer puts its temporary directory under /tmp, 4709 and uses the just-built zic rather than the system zic. 4710 4711 Various fixes to documentation and commentary. 4712 4713 4714Release 2012i - 2012-11-03 12:57:09 -0700 4715 4716 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.) 4717 4718 Linker flags can now be specified via LDFLAGS. 4719 AWK now defaults to 'awk', not 'nawk'. 4720 The shell in tzselect now defaults to /bin/bash, but this can 4721 be overridden by specifying KSHELL. 4722 The main web page now mentions the unofficial GitHub repository. 4723 (Thanks to Mike Frysinger.) 4724 4725 Tarball signatures can now be built by running 'make signatures'. 4726 There are also new makefile rules 'tarballs', 'check_public', and 4727 separate makefile rules for each tarball and signature file. 4728 A few makefile rules are now more portable to strict POSIX. 4729 4730 The main web page now lists the canonical IANA URL. 4731 4732 4733Release 2012h - 2012-10-26 22:49:10 -0700 4734 4735 Bahia no longer has DST. (Thanks to Kelley Cook.) 4736 4737 Tocantins has DST. (Thanks to Rodrigo Severo.) 4738 4739 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.) 4740 4741 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.) 4742 4743 Web page updates. 4744 4745 More C modernization, except that at Arthur David Olson's suggestion 4746 the instances of 'register' were kept. 4747 4748 4749Release 2012g - 2012-10-17 20:59:45 -0700 4750 4751 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.) 4752 4753 Palestine fall 2012. (Thanks to Steffen Thorsen.) 4754 4755 Assume C89. 4756 4757 To attack the version-number problem, this release ships the file 4758 'Makefile' (which contains the release number) in both the tzcode and 4759 the tzdata tarballs. The two Makefiles are identical, and should be 4760 identical in any matching pair of tarballs, so it shouldn't matter 4761 which order you extract the tarballs. Perhaps we can come up with a 4762 better version-number scheme at some point; this scheme does have the 4763 virtue of not adding more files. 4764 4765 4766Release 2012f - 2012-09-12 23:17:03 -0700 4767 4768 * australasia (Pacific/Fiji): Fiji DST is October 21 through January 4769 20 this year. (Thanks to Steffen Thorsen.) 4770 4771 4772Release 2012e - 2012-08-02 20:44:55 -0700 4773 4774 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14. 4775 (Thanks to Steffen Thorsen.) 4776 4777 * Use a single version number for both code and data. 4778 4779 * .gitignore: New file. 4780 4781 * Remove trailing white space. 4782 4783 4784Release code2012c-data2012d - 2012-07-19 16:35:33 -0700 4785 4786 Changes for Morocco's timestamps, which take effect in a couple of 4787 hours, along with infrastructure changes to accommodate how the tz 4788 code and data are released on IANA. 4789 4790 4791Release data2012c - 2012-03-27 12:17:25 -0400 4792 4793 africa 4794 Summer time changes for Morocco (to start late April 2012) 4795 4796 asia 4797 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria 4798 4799 northamerica 4800 Haiti following US/Canada rules for 2012 (and we're assuming, 4801 for now anyway, for the future). 4802 4803 4804Release 2012b - 2012-03-02 12:29:15 +0700 4805 4806 There is just one change to tzcode2012b (compared with 2012a): 4807 the Makefile that was accidentally included with 2012a has been 4808 replaced with the version that should have been there, which is 4809 identical with the previous version (from tzcode2011i). 4810 4811 There are just two changes in tzdata2012b compared with 2012a. 4812 4813 Most significantly, summer time in Cuba has been delayed 3 weeks 4814 (now starts April 1 rather than March 11). Since Mar 11 (the old start 4815 date, as listed in 2012a) is just a little over a week away, this 4816 change is urgent. 4817 4818 Less importantly, an excess tab in one of the changes in zone.tab 4819 in 2012a has been removed. 4820 4821 4822Release 2012a - 2012-03-01 18:28:10 +0700 4823 4824 The changes in tzcode2012a (compared to the previous version, 2011i) 4825 are entirely to the README and tz-art.htm and tz-link.htm files, if 4826 none of those concern you, you can ignore the code update. The changes 4827 reflect the changed addresses for the mailing list and the code and 4828 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile 4829 has been added to tz-link.htm). 4830 4831 In tzdata2012a (compared to the previous release, which was 2011n) 4832 the major changes are: 4833 Chile 2011/2012 and 2012/2013 summer time date adjustments. 4834 Falkland Islands onto permanent summer time (we're assuming for the 4835 foreseeable future, though 2012 is all we're fairly certain of.) 4836 Armenia has abolished Summer Time. 4837 Tokelau jumped the International Date Line back last December 4838 (just the same as their near neighbour, Samoa). 4839 America/Creston is a new zone for a small area of British Columbia 4840 There will be a leapsecond 2012-06-30 23:59:60 UTC. 4841 4842 Other minor changes are: 4843 Corrections to 1918 Canadian summer time end dates. 4844 Updated URL for UK time zone history (in comments) 4845 A few typos in Le Corre's list of free French place names (comments) 4846 4847 4848Release data2011n - 2011-10-30 14:57:54 +0700 4849 4850 There are three changes of note - most urgently, Cuba (America/Havana) 4851 has extended summer time by two weeks, now to end on Nov 13, rather than 4852 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic 4853 (Europe/Tiraspol) decided not to split from the rest of Moldova after 4854 all, and consequently that zone has been removed (again) and reinstated 4855 in the "backward" file as a link to Europe/Chisinau. And third, the 4856 end date for Fiji's summer time this summer was moved forward from the 4857 earlier planned Feb 26, to Jan 22. 4858 4859 Apart from that, Moldova (MD) returns to a single entry in zone.tab 4860 (and the incorrect syntax that was in the 2011m version of that file 4861 is so fixed - it would have been fixed in a different way had this 4862 change not happened - that's the "missing" sccs version id). 4863 4864 4865Release data2011m - 2011-10-24 21:42:16 +0700 4866 4867 In particular, the typos in comments in the data (2011-11-17 should have 4868 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that 4869 Tim Parenti noted) have been fixed, and the change for Ukraine has been 4870 made in all 4 Ukrainian zones, rather than just Europe/Kiev 4871 (again, thanks to Tim Parenti, and also Denys Gavrysh). 4872 4873 In addition, I added Europe/Tiraspol to zone.tab. 4874 4875 This time, all the files have new version numbers... (including the files 4876 otherwise unchanged in 2011m that were changed in 2011l but didn't get new 4877 version numbers there...) 4878 4879 4880Release data2011l - 2011-10-10 11:15:43 +0700 4881 4882 There are just 2 changes that cause different generated tzdata files from 4883 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil 4884 is included, but commented out. Compared with the diff I sent out last week, 4885 this version also includes attributions for the sources for the changes 4886 (in much the same format as ado used, but the html tags have not been 4887 checked, verified, or used in any way at all, so if there are errors there, 4888 please let me know.) 4889 4890 4891Release data2011k - 2011-09-20 17:54:03 -0400 4892 4893 [not summarized] 4894 4895 4896Release data2011j - 2011-09-12 09:22:49 -0400 4897 4898 (contemporary changes for Samoa; past changes for Kenya, Uganda, and 4899 Tanzania); there are also two spelling corrections to comments in 4900 the australasia file (with thanks to Christos Zoulas). 4901 4902 4903Release 2011i - 2011-08-29 05:56:32 -0400 4904 4905 [not summarized] 4906 4907 4908Release data2011h - 2011-06-15 18:41:48 -0400 4909 4910 Russia and Curaçao changes 4911 4912 4913Release 2011g - 2011-04-25 09:07:22 -0400 4914 4915 update the rules for Egypt to reflect its abandonment of DST this year 4916 4917 4918Release 2011f - 2011-04-06 17:14:53 -0400 4919 4920 [not summarized] 4921 4922 4923Release 2011e - 2011-03-31 16:04:38 -0400 4924 4925 Morocco, Chile, and tz-link changes 4926 4927 4928Release 2011d - 2011-03-14 09:18:01 -0400 4929 4930 changes that impact present-day timestamps in Cuba, Samoa, and Turkey 4931 4932 4933Release 2011c - 2011-03-07 09:30:09 -0500 4934 4935 These do affect current timestamps in Chile and Annette Island, Canada. 4936 4937 4938Release 2011b - 2011-02-07 08:44:50 -0500 4939 4940 [not summarized] 4941 4942 4943Release 2011a - 2011-01-24 10:30:16 -0500 4944 4945 [not summarized] 4946 4947 4948Release data2010o - 2010-11-01 09:18:23 -0400 4949 4950 change to the end of DST in Fiji in 2011 4951 4952 4953Release 2010n - 2010-10-25 08:19:17 -0400 4954 4955 [not summarized] 4956 4957 4958Release 2010m - 2010-09-27 09:24:48 -0400 4959 4960 Hong Kong, Vostok, and zic.c changes 4961 4962 4963Release 2010l - 2010-08-16 06:57:25 -0400 4964 4965 [not summarized] 4966 4967 4968Release 2010k - 2010-07-26 10:42:27 -0400 4969 4970 [not summarized] 4971 4972 4973Release 2010j - 2010-05-10 09:07:48 -0400 4974 4975 changes for Bahía de Banderas and for version naming 4976 4977 4978Release data2010i - 2010-04-16 18:50:45 -0400 4979 4980 the end of DST in Morocco on 2010-08-08 4981 4982 4983Release data2010h - 2010-04-05 09:58:56 -0400 4984 4985 [not summarized] 4986 4987 4988Release data2010g - 2010-03-24 11:14:53 -0400 4989 4990 [not summarized] 4991 4992 4993Release 2010f - 2010-03-22 09:45:46 -0400 4994 4995 [not summarized] 4996 4997 4998Release data2010e - 2010-03-08 14:24:27 -0500 4999 5000 corrects the Dhaka bug found by Danvin Ruangchan 5001 5002 5003Release data2010d - 2010-03-06 07:26:01 -0500 5004 5005 [not summarized] 5006 5007 5008Release 2010c - 2010-03-01 09:20:58 -0500 5009 5010 changes including KRE's suggestion for earlier initialization of 5011 "goahead" and "goback" structure elements 5012 5013 5014Release code2010a - 2010-02-16 10:40:04 -0500 5015 5016 [not summarized] 5017 5018 5019Release data2010b - 2010-01-20 12:37:01 -0500 5020 5021 Mexico changes 5022 5023 5024Release data2010a - 2010-01-18 08:30:04 -0500 5025 5026 changes to Dhaka 5027 5028 5029Release data2009u - 2009-12-26 08:32:28 -0500 5030 5031 changes to DST in Bangladesh 5032 5033 5034Release 2009t - 2009-12-21 13:24:27 -0500 5035 5036 [not summarized] 5037 5038 5039Release data2009s - 2009-11-14 10:26:32 -0500 5040 5041 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change 5042 5043 5044Release 2009r - 2009-11-09 10:10:31 -0500 5045 5046 "antarctica" and "tz-link.htm" changes 5047 5048 5049Release 2009q - 2009-11-02 09:12:40 -0500 5050 5051 with two corrections as reported by Eric Muller and Philip Newton 5052 5053 5054Release data2009p - 2009-10-23 15:05:27 -0400 5055 5056 Argentina (including San Luis) changes (with the correction from 5057 Mariano Absatz) 5058 5059 5060Release data2009o - 2009-10-14 16:49:38 -0400 5061 5062 Samoa (commentary only), Pakistan, and Bangladesh changes 5063 5064 5065Release data2009n - 2009-09-22 15:13:38 -0400 5066 5067 added commentary for Argentina and a change to the end of DST in 5068 2009 in Pakistan 5069 5070 5071Release data2009m - 2009-09-03 10:23:43 -0400 5072 5073 Samoa and Palestine changes 5074 5075 5076Release data2009l - 2009-08-14 09:13:07 -0400 5077 5078 Samoa (comments only) and Egypt 5079 5080 5081Release 2009k - 2009-07-20 09:46:08 -0400 5082 5083 [not summarized] 5084 5085 5086Release data2009j - 2009-06-15 06:43:59 -0400 5087 5088 Bangladesh change (with a short turnaround since the DST change is 5089 impending) 5090 5091 5092Release 2009i - 2009-06-08 09:21:22 -0400 5093 5094 updating for DST in Bangladesh this year 5095 5096 5097Release 2009h - 2009-05-26 09:19:14 -0400 5098 5099 [not summarized] 5100 5101 5102Release data2009g - 2009-04-20 16:34:07 -0400 5103 5104 Cairo 5105 5106 5107Release data2009f - 2009-04-10 11:00:52 -0400 5108 5109 correct DST in Pakistan 5110 5111 5112Release 2009e - 2009-04-06 09:08:11 -0400 5113 5114 [not summarized] 5115 5116 5117Release 2009d - 2009-03-23 09:38:12 -0400 5118 5119 Morocco, Tunisia, Argentina, and American Astronomical Society changes 5120 5121 5122Release data2009c - 2009-03-16 09:47:51 -0400 5123 5124 change to the start of Cuban DST 5125 5126 5127Release 2009b - 2009-02-09 11:15:22 -0500 5128 5129 [not summarized] 5130 5131 5132Release 2009a - 2009-01-21 10:09:39 -0500 5133 5134 [not summarized] 5135 5136 5137Release data2008i - 2008-10-21 12:10:25 -0400 5138 5139 southamerica and zone.tab files, with Argentina DST rule changes and 5140 United States zone reordering and recommenting 5141 5142 5143Release 2008h - 2008-10-13 07:33:56 -0400 5144 5145 [not summarized] 5146 5147 5148Release 2008g - 2008-10-06 09:03:18 -0400 5149 5150 Fix a broken HTML anchor and update Brazil's DST transitions; 5151 there's also a slight reordering of information in tz-art.htm. 5152 5153 5154Release data2008f - 2008-09-09 22:33:26 -0400 5155 5156 [not summarized] 5157 5158 5159Release 2008e - 2008-07-28 14:11:17 -0400 5160 5161 changes by Arthur David Olson and Jesper Nørgaard Welen 5162 5163 5164Release data2008d - 2008-07-07 09:51:38 -0400 5165 5166 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo 5167 5168 5169Release data2008c - 2008-05-19 17:48:03 -0400 5170 5171 Pakistan, Morocco, and Mongolia 5172 5173 5174Release data2008b - 2008-03-24 08:30:59 -0400 5175 5176 including renaming Asia/Calcutta to Asia/Kolkata, with a backward 5177 link provided 5178 5179 5180Release 2008a - 2008-03-08 05:42:16 -0500 5181 5182 [not summarized] 5183 5184 5185Release 2007k - 2007-12-31 10:25:22 -0500 5186 5187 most importantly, changes to the "southamerica" file based on 5188 Argentina's readoption of daylight saving time 5189 5190 5191Release 2007j - 2007-12-03 09:51:01 -0500 5192 5193 1. eliminate the "P" (parameter) macro; 5194 5195 2. the "noncontroversial" changes circulated on the time zone 5196 mailing list (less the changes to "logwtmp.c"); 5197 5198 3. eliminate "too many transition" errors when "min" is used in time 5199 zone rules; 5200 5201 4. changes by Paul Eggert (including updated information for Venezuela). 5202 5203 5204Release data2007i - 2007-10-30 10:28:11 -0400 5205 5206 changes for Cuba and Syria 5207 5208 5209Release 2007h - 2007-10-01 10:05:51 -0400 5210 5211 changes by Paul Eggert, as well as an updated link to the ICU 5212 project in tz-link.htm 5213 5214 5215Release 2007g - 2007-08-20 10:47:59 -0400 5216 5217 changes by Paul Eggert 5218 5219 The "leapseconds" file has been updated to incorporate the most 5220 recent International Earth Rotation and Reference Systems Service 5221 (IERS) bulletin. 5222 5223 There's an addition to tz-art.htm regarding the television show "Medium". 5224 5225 5226Release 2007f - 2007-05-07 10:46:46 -0400 5227 5228 changes by Paul Eggert (including Haiti, Turks and Caicos, and New 5229 Zealand) 5230 5231 changes to zic.c to allow hour values greater than 24 (along with 5232 Paul's improved time value overflow checking) 5233 5234 5235Release 2007e - 2007-04-02 10:11:52 -0400 5236 5237 Syria and Honduras changes by Paul Eggert 5238 5239 zic.c variable renaming changes by Arthur David Olson 5240 5241 5242Release 2007d - 2007-03-20 08:48:30 -0400 5243 5244 changes by Paul Eggert 5245 5246 the elimination of white space at the ends of lines 5247 5248 5249Release 2007c - 2007-02-26 09:09:37 -0500 5250 5251 changes by Paul Eggert 5252 5253 5254Release 2007b - 2007-02-12 09:34:20 -0500 5255 5256 Paul Eggert's proposed change to the quotation handling logic in zic.c. 5257 5258 changes to the commentary in "leapseconds" reflecting the IERS 5259 announcement that there is to be no positive leap second at the end 5260 of June 2007. 5261 5262 5263Release 2007a - 2007-01-08 12:28:29 -0500 5264 5265 changes by Paul Eggert 5266 5267 Derick Rethans's Asmara change 5268 5269 Oscar van Vlijmen's Easter Island local mean time change 5270 5271 symbolic link changes 5272 5273 5274Release 2006p - 2006-11-27 08:54:27 -0500 5275 5276 changes by Paul Eggert 5277 5278 5279Release 2006o - 2006-11-06 09:18:07 -0500 5280 5281 changes by Paul Eggert 5282 5283 5284Release 2006n - 2006-10-10 11:32:06 -0400 5285 5286 changes by Paul Eggert 5287 5288 5289Release 2006m - 2006-10-02 15:32:35 -0400 5290 5291 changes for Uruguay, Palestine, and Egypt by Paul Eggert 5292 5293 (minimalist) changes to zic.8 to clarify "until" information 5294 5295 5296Release data2006l - 2006-09-18 12:58:11 -0400 5297 5298 Paul's best-effort work on this coming weekend's Egypt time change 5299 5300 5301Release 2006k - 2006-08-28 12:19:09 -0400 5302 5303 changes by Paul Eggert 5304 5305 5306Release 2006j - 2006-08-21 09:56:32 -0400 5307 5308 changes by Paul Eggert 5309 5310 5311Release code2006i - 2006-08-07 12:30:55 -0400 5312 5313 localtime.c fixes 5314 5315 Ken Pizzini's conversion script 5316 5317 5318Release code2006h - 2006-07-24 09:19:37 -0400 5319 5320 adds public domain notices to four files 5321 5322 includes a fix for transition times being off by a second 5323 5324 adds a new recording to the "arts" file (information courtesy Colin Bowern) 5325 5326 5327Release 2006g - 2006-05-08 17:18:09 -0400 5328 5329 northamerica changes by Paul Eggert 5330 5331 5332Release 2006f - 2006-05-01 11:46:00 -0400 5333 5334 a missing version number problem is fixed (with thanks to Bradley 5335 White for catching the problem) 5336 5337 5338Release 2006d - 2006-04-17 14:33:43 -0400 5339 5340 changes by Paul Eggert 5341 5342 added new items to tz-arts.htm that were found by Paul 5343 5344 5345Release 2006c - 2006-04-03 10:09:32 -0400 5346 5347 two sets of data changes by Paul Eggert 5348 5349 a fencepost error fix in zic.c 5350 5351 changes to zic.c and the "europe" file to minimize differences 5352 between output produced by the old 32-bit zic and the new 64-bit 5353 version 5354 5355 5356Release 2006b - 2006-02-20 10:08:18 -0500 5357 [tz32code2006b + tz64code2006b + tzdata2006b] 5358 5359 64-bit code 5360 5361 All SCCS IDs were bumped to "8.1" for this release. 5362 5363 5364Release 2006a - 2006-01-30 08:59:31 -0500 5365 5366 changes by Paul Eggert (in particular, Indiana time zone moves) 5367 5368 an addition to the zic manual page to describe how special-case 5369 transitions are handled 5370 5371 5372Release 2005r - 2005-12-27 09:27:13 -0500 5373 5374 Canadian changes by Paul Eggert 5375 5376 They also add "<pre>" directives to time zone data files and reflect 5377 changes to warning message logic in "zdump.c" (but with calls to 5378 "gettext" kept unbundled at the suggestion of Ken Pizzini). 5379 5380 5381Release 2005q - 2005-12-13 09:17:09 -0500 5382 5383 Nothing earth-shaking here: 5384 1. Electronic mail addresses have been removed. 5385 2. Casts of the return value of exit have been removed. 5386 3. Casts of the argument of is.* macros have been added. 5387 4. Indentation in one section of zic.c has been fixed. 5388 5. References to dead URLs in the data files have been dealt with. 5389 5390 5391Release 2005p - 2005-12-05 10:30:53 -0500 5392 5393 "systemv", "tz-link.htm", and "zdump.c" changes 5394 (less the casts of arguments to the is* macros) 5395 5396 5397Release 2005o - 2005-11-28 10:55:26 -0500 5398 5399 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert 5400 5401 zdump.c lint fixes by Arthur David Olson 5402 5403 5404Release 2005n - 2005-10-03 09:44:09 -0400 5405 5406 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan 5407 et al. changes) 5408 5409 5410Release 2005m - 2005-08-29 12:15:40 -0400 5411 5412 changes by Paul Eggert (with a small tweak to the tz-art change) 5413 5414 a declaration of an unused variable has been removed from zdump.c 5415 5416 5417Release 2005l - 2005-08-22 12:06:39 -0400 5418 5419 changes by Paul Eggert 5420 5421 overflow/underflow checks by Arthur David Olson, minus changes to 5422 the "Theory" file about the pending addition of 64-bit data (I grow 5423 less confident of the changes being accepted with each passing day, 5424 and the changes no longer increase the data files nine-fold--there's 5425 less than a doubling in size by my local Sun's reckoning) 5426 5427 5428Release 2005k - 2005-07-14 14:14:24 -0400 5429 5430 The "leapseconds" file has been edited to reflect the recently 5431 announced leap second at the end of 2005. 5432 5433 I've also deleted electronic mail addresses from the files as an 5434 anti-spam measure. 5435 5436 5437Release 2005j - 2005-06-13 14:34:13 -0400 5438 5439 These reflect changes to limit the length of time zone abbreviations 5440 and the characters used in those abbreviations. 5441 5442 There are also changes to handle POSIX-style "quoted" timezone 5443 environment variables. 5444 5445 The changes were circulated on the time zone mailing list; the only 5446 change since then was the removal of a couple of minimum-length of 5447 abbreviation checks. 5448 5449 5450Release data2005i - 2005-04-21 15:04:16 -0400 5451 5452 changes (most importantly to Nicaragua and Haiti) by Paul Eggert 5453 5454 5455Release 2005h - 2005-04-04 11:24:47 -0400 5456 5457 changes by Paul Eggert 5458 5459 minor changes to Makefile and zdump.c to produce more useful output 5460 when doing a "make typecheck" 5461 5462 5463Release 2005g - 2005-03-14 10:11:21 -0500 5464 5465 changes by Paul Eggert (a change to current DST rules in Uruguay and 5466 an update to a link to time zone software) 5467 5468 5469Release 2005f - 2005-03-01 08:45:32 -0500 5470 5471 data and documentation changes by Paul Eggert 5472 5473 5474Release 2005e - 2005-02-10 15:59:44 -0500 5475 5476 [not summarized] 5477 5478 5479Release code2005d - 2005-01-31 09:21:47 -0500 5480 5481 make zic complain about links to links if the -v flag is used 5482 5483 have "make public" do more code checking 5484 5485 add an include to "localtime.c" for the benefit of gcc systems 5486 5487 5488Release 2005c - 2005-01-17 18:36:29 -0500 5489 5490 get better results when mktime runs on a system where time_t is double 5491 5492 changes to the data files (most importantly to Paraguay) 5493 5494 5495Release 2005b - 2005-01-10 09:19:54 -0500 5496 5497 Get localtime and gmtime working on systems with exotic time_t types. 5498 5499 Update the leap second commentary in the "leapseconds" file. 5500 5501 5502Release 2005a - 2005-01-01 13:13:44 -0500 5503 5504 [not summarized] 5505 5506 5507Release code2004i - 2004-12-14 13:42:58 -0500 5508 5509 Deal with systems where time_t is unsigned. 5510 5511 5512Release code2004h - 2004-12-07 11:40:18 -0500 5513 5514 64-bit-time_t changes 5515 5516 5517Release 2004g - 2004-11-02 09:06:01 -0500 5518 5519 update to Cuba (taking effect this weekend) 5520 5521 other changes by Paul Eggert 5522 5523 correction of the spelling of Oslo 5524 5525 changed versions of difftime.c and private.h 5526 5527 5528Release code2004f - 2004-10-21 10:25:22 -0400 5529 5530 Cope with wide-ranging tm_year values. 5531 5532 5533Release 2004e - 2004-10-11 14:47:21 -0400 5534 5535 Brazil/Argentina/Israel changes by Paul Eggert 5536 5537 changes to tz-link.htm by Paul 5538 5539 one small fix to Makefile 5540 5541 5542Release 2004d - 2004-09-22 08:27:29 -0400 5543 5544 Avoid overflow problems when TM_YEAR_BASE is added to an integer. 5545 5546 5547Release 2004c - 2004-08-11 12:06:26 -0400 5548 5549 asctime-related changes 5550 5551 (variants of) some of the documentation changes suggested by Paul Eggert 5552 5553 5554Release 2004b - 2004-07-19 14:33:35 -0400 5555 5556 data changes by Paul Eggert - most importantly, updates for Argentina 5557 5558 5559Release 2004a - 2004-05-27 12:00:47 -0400 5560 5561 changes by Paul Eggert 5562 5563 Handle DST transitions that occur at the end of a month in some 5564 years but at the start of the following month in other years. 5565 5566 Add a copy of the correspondence that's the basis for claims about 5567 DST in the Navajo Nation. 5568 5569 5570Release 2003e - 2003-12-15 09:36:47 -0500 5571 5572 changes by Arthur David Olson (primarily code changes) 5573 5574 changes by Paul Eggert (primarily data changes) 5575 5576 minor changes to "Makefile" and "northamerica" (in the latter case, 5577 optimization of the "Toronto" rules) 5578 5579 5580Release 2003d - 2003-10-06 09:34:44 -0400 5581 5582 changes by Paul Eggert 5583 5584 5585Release 2003c - 2003-09-16 10:47:05 -0400 5586 5587 Fix bad returns in zic.c's inleap function. 5588 Thanks to Bradley White for catching the problem! 5589 5590 5591Release 2003b - 2003-09-16 07:13:44 -0400 5592 5593 Add a "--version" option (and documentation) to the zic and zdump commands. 5594 5595 changes to overflow/underflow checking in zic 5596 5597 a localtime typo fix. 5598 5599 Update the leapseconds and tz-art.htm files. 5600 5601 5602Release 2003a - 2003-03-24 09:30:54 -0500 5603 5604 changes by Paul Eggert 5605 5606 a few additions and modifications to the tz-art.htm file 5607 5608 5609Release 2002d - 2002-10-15 13:12:42 -0400 5610 5611 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab 5612 5613 There's also a new time zone quote in "tz-art.htm". 5614 5615 5616Release 2002c - 2002-04-04 11:55:20 -0500 5617 5618 changes by Paul Eggert 5619 5620 Change zic.c to avoid creating symlinks to files that don't exist. 5621 5622 5623Release 2002b - 2002-01-28 12:56:03 -0500 5624 5625 [These change notes are for Release 2002a, which was corrupted. 5626 2002b was a corrected version of 2002a.] 5627 5628 changes by Paul Eggert 5629 5630 Update the "leapseconds" file to note that there'll be no leap 5631 second at the end of June, 2002. 5632 5633 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone. 5634 5635 Change to "difftime.c" to avoid sizeof problems. 5636 5637 5638Release 2001d - 2001-10-09 13:31:32 -0400 5639 5640 changes by Paul Eggert 5641 5642 5643Release 2001c - 2001-06-05 13:59:55 -0400 5644 5645 changes by Paul Eggert and Andrew Brown 5646 5647 5648Release 2001b - 2001-04-05 16:44:38 -0400 5649 5650 changes by Paul Eggert (modulo jnorgard's typo fix) 5651 5652 tz-art.htm has been HTMLified. 5653 5654 5655Release 2001a - 2001-03-13 12:57:44 -0500 5656 5657 changes by Paul Eggert 5658 5659 An addition to the "leapseconds" file: comments with the text of the 5660 latest IERS leap second notice. 5661 5662 Trailing white space has been removed from data file lines, and 5663 repeated spaces in "Rule Jordan" lines in the "asia" file have been 5664 converted to tabs. 5665 5666 5667Release 2000h - 2000-12-14 15:33:38 -0500 5668 5669 changes by Paul Eggert 5670 5671 one typo fix in the "art" file 5672 5673 With providence, this is the last update of the millennium. 5674 5675 5676Release 2000g - 2000-10-10 11:35:22 -0400 5677 5678 changes by Paul Eggert 5679 5680 correction of John Mackin's name submitted by Robert Elz 5681 5682 Garry Shandling's Daylight Saving Time joke (!?!) from the recent 5683 Emmy Awards broadcast. 5684 5685 5686Release 2000f - 2000-08-10 09:31:58 -0400 5687 5688 changes by Paul Eggert 5689 5690 Added information in "tz-art.htm" on a Seinfeld reference to DST. 5691 5692 Error checking and messages in the "yearistype" script have been 5693 improved. 5694 5695 5696Release 2000e - 2000-07-31 09:27:54 -0400 5697 5698 data changes by Paul Eggert 5699 5700 a change to the default value of the defined constant HAVE_STRERROR 5701 5702 the addition of a Dave Barry quote on DST to the tz-arts file 5703 5704 5705Release 2000d - 2000-04-20 15:43:04 -0400 5706 5707 changes to the documentation and code of strftime for C99 conformance 5708 5709 a bug fix for date.c 5710 5711 These are based on (though modified from) changes by Paul Eggert. 5712 5713 5714Release 2000c - 2000-03-04 10:31:43 -0500 5715 5716 changes by Paul Eggert 5717 5718 5719Release 2000b - 2000-02-21 12:16:29 -0500 5720 5721 changes by Paul Eggert and Joseph Myers 5722 5723 modest tweaks to the tz-art.htm and tz-link.htm files 5724 5725 5726Release 2000a - 2000-01-18 09:21:26 -0500 5727 5728 changes by Paul Eggert 5729 5730 The two hypertext documents have also been renamed. 5731 5732 5733Release code1999i-data1999j - 1999-11-15 18:43:22 -0500 5734 5735 Paul Eggert's changes 5736 5737 additions to the "zic" manual page and the "Arts.htm" file 5738 5739 5740Release code1999h-data1999i - 1999-11-08 14:55:21 -0500 5741 5742 [not summarized] 5743 5744 5745Release data1999h - 1999-10-07 03:50:29 -0400 5746 5747 changes by Paul Eggert to "europe" (most importantly, fixing 5748 Lithuania and Estonia) 5749 5750 5751Release 1999g - 1999-09-28 11:06:18 -0400 5752 5753 data changes by Paul Eggert (most importantly, the change for 5754 Lebanon that buys correctness for this coming Sunday) 5755 5756 The "code" file contains changes to "Makefile" and "checktab.awk" to 5757 allow better checking of time zone files before they are published. 5758 5759 5760Release 1999f - 1999-09-23 09:48:14 -0400 5761 5762 changes by Arthur David Olson and Paul Eggert 5763 5764 5765Release 1999e - 1999-08-17 15:20:54 -0400 5766 5767 changes circulated by Paul Eggert, although the change to handling 5768 of DST-specifying timezone names has been commented out for now 5769 (search for "XXX" in "localtime.c" for details). These files also 5770 do not make any changes to the start of DST in Brazil. 5771 5772 In addition to Paul's changes, there are updates to "Arts.htm" and 5773 cleanups of URLs. 5774 5775 5776Release 1999d - 1999-03-30 11:31:07 -0500 5777 5778 changes by Paul Eggert 5779 5780 The Makefile's "make public" rule has also been changed to do a test 5781 compile of each individual time zone data file (which should help 5782 avoid problems such as the one we had with Nicosia). 5783 5784 5785Release 1999c - 1999-03-25 09:47:47 -0500 5786 5787 changes by Paul Eggert, most importantly the change for Chile. 5788 5789 5790Release 1999b - 1999-02-01 17:51:44 -0500 5791 5792 changes by Paul Eggert 5793 5794 code changes (suggested by Mani Varadarajan, mani at be.com) for 5795 correct handling of symbolic links when building using a relative directory 5796 5797 code changes to generate correct messages for failed links 5798 5799 updates to the URLs in Arts.htm 5800 5801 5802Release 1999a - 1999-01-19 16:20:29 -0500 5803 5804 error message internationalizations and corrections in zic.c and 5805 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz, 5806 to whom thanks!) 5807 5808 5809Release code1998h-data1998i - 1998-10-01 09:56:10 -0400 5810 5811 changes for Brazil, Chile, and Germany 5812 5813 support for use of "24:00" in the input files for the time zone compiler 5814 5815 5816Release code1998g-data1998h - 1998-09-24 10:50:28 -0400 5817 5818 changes by Paul Eggert 5819 5820 correction to a define in the "private.h" file 5821 5822 5823Release data1998g - 1998-08-11 03:28:35 -0000 5824 [tzdata1998g.tar.gz is missing!] 5825 5826 Lithuanian change provided by mgedmin at pub.osf.it 5827 5828 Move creation of the GMT link with Etc/GMT to "etcetera" (from 5829 "backward") to ensure that the GMT file is created even where folks 5830 don't want the "backward" links (as suggested by Paul Eggert). 5831 5832 5833Release data1998f - 1998-07-20 13:50:00 -0000 5834 [tzdata1998f.tar.gz is missing!] 5835 5836 Update the "leapseconds" file to include the newly announced 5837 insertion at the end of 1998. 5838 5839 5840Release code1998f - 1998-06-01 10:18:31 -0400 5841 5842 addition to localtime.c by Guy Harris 5843 5844 5845Release 1998e - 1998-05-28 09:56:26 -0400 5846 5847 The Makefile is changed to produce zoneinfo-posix rather than 5848 zoneinfo/posix, and to produce zoneinfo-leaps rather than 5849 zoneinfo/right. 5850 5851 data changes by Paul Eggert 5852 5853 changes from Guy Harris to provide asctime_r and ctime_r 5854 5855 A usno1998 file (substantially identical to usno1997) has been added. 5856 5857 5858Release 1998d - 1998-05-14 11:58:34 -0400 5859 5860 changes to comments (in particular, elimination of references to CIA maps). 5861 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places 5862 where changes occur. 5863 5864 5865Release 1998c - 1998-02-28 12:32:26 -0500 5866 5867 changes by Paul Eggert (save the "French correction," on which I'll 5868 wait for the dust to settle) 5869 5870 symlink changes 5871 5872 changes and additions to Arts.htm 5873 5874 5875Release 1998b - 1998-01-17 14:31:51 -0500 5876 5877 URL cleanups and additions 5878 5879 5880Release 1998a - 1998-01-13 12:37:35 -0500 5881 5882 changes by Paul Eggert 5883 5884 5885Release code1997i-data1997k - 1997-12-29 09:53:41 -0500 5886 5887 changes by Paul Eggert, with minor modifications from Arthur David 5888 Olson to make the files more browser friendly 5889 5890 5891Release code1997h-data1997j - 1997-12-18 17:47:35 -0500 5892 5893 minor changes to put "TZif" at the start of each timezone information file 5894 5895 a rule has also been added to the Makefile so you can 5896 make zones 5897 to just recompile the zone information files (rather than doing a 5898 full "make install" with its other effects). 5899 5900 5901Release data1997i - 1997-10-07 08:45:38 -0400 5902 5903 changes to Africa by Paul Eggert 5904 5905 5906Release code1997g-data1997h - 1997-09-04 16:56:54 -0400 5907 5908 corrections for Uruguay (and other locations) 5909 5910 Arthur David Olson's simple-minded fix allowing mktime to both 5911 correctly handle leap seconds and correctly handle tm_sec values 5912 upon which arithmetic has been performed. 5913 5914 5915Release code1997f-data1997g - 1997-07-19 13:15:02 -0400 5916 5917 Paul Eggert's updates 5918 5919 a small change to a function prototype; 5920 5921 "Music" has been renamed "Arts.htm", HTMLified, and augmented to 5922 include information on Around the World in Eighty Days. 5923 5924 5925Release code1997e-data1997f - 1997-05-03 18:52:34 -0400 5926 5927 fixes to zic's error handling 5928 5929 changes inspired by the item circulated on Slovenia 5930 5931 The description of Web resources has been HTMLified for browsing 5932 convenience. 5933 5934 A new piece of tz-related music has been added to the "Music" file. 5935 5936 5937Release code1997d-data1997e - 1997-03-29 12:48:52 -0500 5938 5939 Paul Eggert's latest suggestions 5940 5941 5942Release code1997c-data1997d - 1997-03-07 20:37:54 -0500 5943 5944 changes to "zic.c" to correct performance of the "-s" option 5945 5946 a new file "usno1997" 5947 5948 5949Release data1997c - 1997-03-04 09:58:18 -0500 5950 5951 changes in Israel 5952 5953 5954Release 1997b - 1997-02-27 18:34:19 -0500 5955 5956 The data file incorporates the 1997 leap second. 5957 5958 The code file incorporates Arthur David Olson's take on the 5959 zic/multiprocessor/directory-creation situation. 5960 5961 5962Release 1997a - 1997-01-21 09:11:10 -0500 5963 5964 Paul Eggert's Antarctica (and other changes) 5965 5966 Arthur David Olson finessed the "getopt" issue by checking against 5967 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1 5968 is returned while SunOS 5.5's manual says EOF is returned). 5969 5970 5971Release code1996o-data1996n - 1996-12-27 21:42:05 -0500 5972 5973 Paul Eggert's latest changes 5974 5975 5976Release code1996n - 1996-12-16 09:42:02 -0500 5977 5978 link snapping fix from Bruce Evans (via Garrett Wollman) 5979 5980 5981Release data1996m - 1996-11-24 02:37:34 -0000 5982 [tzdata1996m.tar.gz is missing!] 5983 5984 Paul Eggert's batch of changes 5985 5986 5987Release code1996m-data1996l - 1996-11-05 14:00:12 -0500 5988 5989 No functional changes here; the files have simply been changed to 5990 make more use of ISO style dates in comments. The names of the above 5991 files now include the year in full. 5992 5993 5994Release code96l - 1996-09-08 17:12:20 -0400 5995 5996 tzcode96k was missing a couple of pieces. 5997 5998 5999Release 96k - 1996-09-08 16:06:22 -0400 6000 6001 the latest round of changes from Paul Eggert 6002 6003 the recent Year 2000 material 6004 6005 6006Release code96j - 1996-07-30 13:18:53 -0400 6007 6008 Set sp->typecnt as suggested by Timothy Patrick Murphy. 6009 6010 6011Release code96i - 1996-07-27 20:11:35 -0400 6012 6013 Paul's suggested patch for strftime %V week numbers 6014 6015 6016Release data96i - 1996-07-01 18:13:04 -0400 6017 6018 "northamerica" and "europe" changes by Paul Eggert 6019 6020 6021Release code96h - 1996-06-05 08:02:21 -0400 6022 6023 fix for handling transitions specified in Universal Time 6024 6025 Some "public domain" notices have also been added. 6026 6027 6028Release code96g - 1996-05-16 14:00:26 -0400 6029 6030 fix for the simultaneous-DST-and-zone-change challenge 6031 6032 6033Release data96h - 1996-05-09 17:40:51 -0400 6034 6035 changes by Paul Eggert 6036 6037 6038Release code96f-data96g - 1996-05-03 03:09:59 -0000 6039 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!] 6040 6041 The changes get us some of the way to fixing the problems noted in Paul 6042 Eggert's letter yesterday (in addition to a few others). The approach 6043 has been to make zic a bit smarter about figuring out what time zone 6044 abbreviations apply just after the time specified in the "UNTIL" part 6045 of a zone line. Putting the smarts in zic means avoiding having 6046 transition times show up in both "Zone" lines and "Rule" lines, which 6047 in turn avoids multiple transition time entries in time zone files. 6048 (This also makes the zic input files such as "europe" a bit shorter and 6049 should ease maintenance.) 6050 6051 6052Release data96f - 1996-04-19 19:20:03 -0000 6053 [tzdata96f.tar.gz is missing!] 6054 6055 The only changes are to the "northamerica" file; the time zone 6056 abbreviation for Denver is corrected to MST (and MDT), and the 6057 comments for Mexico have been updated. 6058 6059 6060Release data96e - 1996-03-19 17:37:26 -0500 6061 6062 Proposals by Paul Eggert, in particular the Portugal change that 6063 comes into play at the end of this month. 6064 6065 6066Release data96d - 1996-03-18 20:49:39 -0500 6067 6068 [not summarized] 6069 6070 6071Release code96e - 1996-02-29 15:43:27 -0000 6072 [tzcode96e.tar.gz is missing!] 6073 6074 internationalization changes and the fix to the documentation for strftime 6075 6076 6077Release code96d-data96c - 1996-02-12 11:05:27 -0500 6078 6079 The "code" file simply updates Bob Kridle's electronic address. 6080 6081 The "data" file updates rules for Mexico. 6082 6083 6084Release data96b - 1996-01-27 15:44:42 -0500 6085 6086 Kiribati change 6087 6088 6089Release code96c - 1996-01-16 16:58:15 -0500 6090 6091 leap-year streamlining and binary-search changes 6092 6093 fix to newctime.3 6094 6095 6096Release code96b - 1996-01-10 20:42:39 -0500 6097 6098 fixes and enhancements from Paul Eggert, including code that 6099 emulates the behavior of recent versions of the SunOS "date" 6100 command. 6101 6102 6103Release 96a - 1996-01-06 09:08:24 -0500 6104 6105 Israel updates 6106 6107 fixes to strftime.c for correct ISO 8601 week number generation, 6108 plus support for two new formats ('G' and 'g') to give ISO 8601 year 6109 numbers (which are not necessarily the same as calendar year numbers) 6110 6111 6112Release code95i-data95m - 1995-12-21 12:46:47 -0500 6113 6114 The latest revisions from Paul Eggert are included, the usno1995 6115 file has been updated, and a new file ("WWW") covering useful URLs 6116 has been added. 6117 6118 6119Release code95h-data95l - 1995-12-19 18:10:12 -0500 6120 6121 A simplification of a macro definition, a change to data for Sudan, 6122 and (for last minute shoppers) notes in the "Music" file on the CD 6123 "Old Man Time". 6124 6125 6126Release code95g-data95k - 1995-10-30 10:32:47 -0500 6127 6128 (slightly reformatted) 8-bit-clean proposed patch 6129 6130 minor patch: US/Eastern -> America/New_York 6131 6132 snapshot of the USNO's latest data ("usno1995") 6133 6134 some other minor cleanups 6135 6136 6137Release code95f-data95j - 1995-10-28 21:01:34 -0000 6138 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!] 6139 6140 European cleanups 6141 6142 support for 64-bit time_t's 6143 6144 optimization in localtime.c 6145 6146 6147Release code95e - 1995-10-13 13:23:57 -0400 6148 6149 the mktime change to scan from future to past when trying to find time zone 6150 offsets 6151 6152 6153Release data95i - 1995-09-26 10:43:26 -0400 6154 6155 For Canada/Central, guess that the Sun customer's "one week too 6156 early" was just a approximation, and the true error is one month 6157 too early. This is consistent with the rest of Canada. 6158 6159 6160Release data95h - 1995-09-21 11:26:48 -0400 6161 6162 latest changes from Paul Eggert 6163 6164 6165Release code95d - 1995-09-14 11:14:45 -0400 6166 6167 the addition of a "Music" file, which documents four recorded 6168 versions of the tune "Save That Time". 6169 6170 6171Release data95g - 1995-09-01 17:21:36 -0400 6172 6173 "yearistype" correction 6174 6175 6176Release data95f - 1995-08-28 20:46:56 -0400 6177 6178 Paul Eggert's change to the australasia file 6179 6180 6181Release data95e - 1995-07-08 18:02:34 -0400 6182 6183 The only change is a leap second at the end of this year. 6184 Thanks to Bradley White for forwarding news on the leap second. 6185 6186 6187Release data95d - 1995-07-03 13:26:22 -0400 6188 6189 Paul Eggert's changes 6190 6191 6192Release data95c - 1995-07-02 19:19:28 -0400 6193 6194 changes to "asia", "backward", "europe", and "southamerica" 6195 (read: northamericacentrics need not apply) 6196 6197 6198Release code95c - 1995-03-13 14:00:46 -0500 6199 6200 one-line fix for sign extension problems in detzcode 6201 6202 6203Release 95b - 1995-03-04 11:22:38 -0500 6204 6205 Minor changes in both: 6206 6207 The "code" file contains a workaround for the lack of "unistd.h" in 6208 Microsoft C++ version 7. 6209 6210 The "data" file contains a fixed "Link" for America/Shiprock. 6211 6212 6213Release 94h - 1994-12-10 12:51:14 -0500 6214 6215 The files: 6216 6217 * incorporate the changes to "zdump" and "date" to make changes to 6218 the "TZ" environment variable permanent; 6219 6220 * incorporate the table changes by Paul Eggert; 6221 6222 * include (and document) support for universal time specifications in 6223 data files - but do not (yet) include use of this feature in the 6224 data files. 6225 6226 Think of this as "TZ Classic" - the software has been set up not to break if 6227 universal time shows up in its input, and data entries have been 6228 left as is so as not to break existing implementations. 6229 6230 6231Release data94f - 1994-08-20 12:56:09 -0400 6232 6233 (with thanks!) the latest data updates from Paul Eggert 6234 6235 6236Release data94e - 1994-06-04 13:13:53 -0400 6237 6238 [not summarized] 6239 6240 6241Release code94g - 1994-05-05 12:14:07 -0400 6242 6243 fix missing "optind.c" and a reference to it in the Makefile 6244 6245 6246Release code94f - 1994-05-05 13:00:33 -0000 6247 [tzcode94f.tar.gz is missing!] 6248 6249 changes to avoid overflow in difftime, as well as changes to cope 6250 with the 52/53 challenge in strftime 6251 6252 6253Release code94e - 1994-03-30 23:32:59 -0500 6254 6255 change for the benefit of PCTS 6256 6257 6258Release 94d - 1994-02-24 15:42:25 -0500 6259 6260 Avoid clashes with POSIX semantics for zones such as GMT+4. 6261 6262 Some other very minor housekeeping is also present. 6263 6264 6265Release code94c - 1994-02-10 08:52:40 -0500 6266 6267 Fix bug where mkdirs was broken unless you compile with 6268 -fwritable-strings (which is generally losing to do). 6269 6270 6271Release 94b - 1994-02-07 10:04:33 -0500 6272 6273 work by Paul Eggert who notes: 6274 6275 I found another book of time zone histories by E W Whitman; it's not 6276 as extensive as Shanks but has a few goodies of its own. I used it 6277 to update the tables. I also fixed some more as a result of 6278 correspondence with Adam David and Peter Ilieve, and move some stray 6279 links from 'europe' to 'backward'. I corrected some scanning errors 6280 in usno1989. 6281 6282 As far as the code goes, I fixed zic to allow years in the range 6283 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900. 6284 And I cleaned up the zic documentation a little bit. 6285 6286 6287Release data94a - 1994-02-03 08:58:54 -0500 6288 6289 It simply incorporates the recently announced leap second into the 6290 "leapseconds" file. 6291 6292 6293Release 93g - 1993-11-22 17:28:27 -0500 6294 6295 Paul Eggert has provided a good deal of historic information (based 6296 on Shanks), and there are some code changes to deal with the buglets 6297 that crawled out in dealing with the new information. 6298 6299 6300Release 93f - 1993-10-15 12:27:46 -0400 6301 6302 Paul Eggert's changes 6303 6304 6305Release 93e - 1993-09-05 21:21:44 -0400 6306 6307 This has updated data for Israel, England, and Kwajalein. There's 6308 also an update to "zdump" to cope with Kwajalein's 24-hour jump. 6309 Thanks to Paul Eggert and Peter Ilieve for the changes. 6310 6311 6312Release 93d - 1993-06-17 23:34:17 -0400 6313 6314 new fix and new data on Israel 6315 6316 6317Release 93c - 1993-06-06 19:31:55 -0400 6318 6319 [not summarized] 6320 6321 6322Release 93b - 1993-02-02 14:53:58 -0500 6323 6324 updated "leapseconds" file 6325 6326 6327Release 93 - 1993-01-08 07:01:06 -0500 6328 6329 At kre's suggestion, the package has been split in two - a code piece 6330 (which also includes documentation) that's only of use to folks who 6331 want to recompile things and a data piece useful to anyone who can 6332 run "zic". 6333 6334 The new version has a few changes to the data files, a few 6335 portability changes, and an off-by-one fix (with thanks to 6336 Tom Karzes at deshaw.com for providing a description and a 6337 solution). 6338 6339 6340Release 92c - 1992-11-21 17:35:36 -0000 6341 [tz92c.tar.Z is missing!] 6342 6343 The fallout from the latest round of DST transitions. 6344 6345 There are changes for Portugal, Saskatchewan, and "Pacific-New"; 6346 there's also a change to "zic.c" that makes it portable to more systems. 6347 6348 6349Release 92 - 1992-04-25 18:17:03 -0000 6350 [tz92.tar.Z is missing!] 6351 6352 By popular demand (well, at any rate, following a request by kre at munnari) 6353 6354 6355The 1989 update of the time zone package featured: 6356 6357 * POSIXization (including interpretation of POSIX-style TZ environment 6358 variables, provided by Guy Harris), 6359 * ANSIfication (including versions of "mktime" and "difftime"), 6360 * SVIDulation (an "altzone" variable) 6361 * MACHination (the "gtime" function) 6362 * corrections to some time zone data (including corrections to the rules 6363 for Great Britain and New Zealand) 6364 * reference data from the United States Naval Observatory for folks who 6365 want to do additional time zones 6366 * and the 1989 data for Saudi Arabia. 6367 6368 (Since this code will be treated as "part of the implementation" in some 6369 places and as "part of the application" in others, there's no good way to 6370 name functions, such as timegm, that are not part of the proposed ANSI C 6371 standard; such functions have kept their old, underscore-free names in this 6372 update.) 6373 6374 And the "dysize" function has disappeared; it was present to allow 6375 compilation of the "date" command on old BSD systems, and a version of "date" 6376 is now provided in the package. The "date" command is not created when you 6377 "make all" since it may lack options provided by the version distributed with 6378 your operating system, or may not interact with the system in the same way 6379 the native version does. 6380 6381 Since POSIX frowns on correct leap second handling, the default behavior of 6382 the "zic" command (in the absence of a "-L" option) has been changed to omit 6383 leap second information from its output files. 6384 6385 6386----- 6387Notes 6388 6389This file contains copies of the part of each release announcement 6390that talks about the changes in that release. The text has been 6391adapted and reformatted for the purposes of this file. 6392 6393Traditionally a release R consists of a pair of tarball files, 6394tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g., 6395code2010a, data2012c) consist of just one or the other tarball, and a 6396few (e.g., code2012c-data2012d) have tarballs with mixed version 6397numbers. Recent releases also come in an experimental format 6398consisting of a single tarball tzdb-R.tar.lz with extra data. 6399 6400Release timestamps are taken from the release's commit (for newer, 6401Git-based releases), from the newest file in the tarball (for older 6402releases, where this info is available) or from the email announcing 6403the release (if all else fails; these are marked with a time zone 6404abbreviation of -0000 and an "is missing!" comment). 6405 6406Earlier versions of the code and data were not announced on the tz 6407list and are not summarized here. 6408 6409This file is in the public domain. 6410 6411Local Variables: 6412coding: utf-8 6413End: 6414