NEWS revision 1.47
1 News for the tz database 2 3 Release 2025b - 2025-03-22 13:40:46 -0700 4 5 Briefly: 6 New zone for Aysn Region in Chile which moves from -04/-03 to -03. 7 8 Changes to future timestamps 9 10 Chile's Aysn 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 28 Release 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. 104 105 106 Release 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.) 224 225 226 Release 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 Jurez 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 on Trn Cng 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 Smrgrav.) 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.) 292 293 294 Release 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. 396 397 398 Release 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.) 404 405 406 Release 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.] 412 413 414 Release 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. 510 511 512 Release 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 Jurez, 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 Jrgen 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 on Trn Cng 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 On C23-compatible platforms tzcode no longer uses syntax like 598 'static [[noreturn]] void usage(void);'. Instead, it uses 599 '[[noreturn]] static void usage(void);' as strict C23 requires. 600 (Problem reported by Houge Langley.) 601 602 603 Release 2022f - 2022-10-28 18:04:57 -0700 604 605 Briefly: 606 Mexico will no longer observe DST except near the US border. 607 Chihuahua moves to year-round -06 on 2022-10-30. 608 Fiji no longer observes DST. 609 Move links to 'backward'. 610 In vanguard form, GMT is now a Zone and Etc/GMT a link. 611 zic now supports links to links, and vanguard form uses this. 612 Simplify four Ontario zones. 613 Fix a Y2438 bug when reading TZif data. 614 Enable 64-bit time_t on 32-bit glibc platforms. 615 Omit large-file support when no longer needed. 616 In C code, use some C23 features if available. 617 Remove no-longer-needed workaround for Qt bug 53071. 618 619 Changes to future timestamps 620 621 Mexico will no longer observe DST after 2022, except for areas 622 near the US border that continue to observe US DST rules. 623 On 2022-10-30 at 02:00 the Mexican state of Chihuahua moves 624 from -07 (-06 with DST) to year-round -06, thus not changing 625 its clocks that day. The new law states that Chihuahua 626 near the US border no longer observes US DST. 627 (Thanks to gera for the heads-up about Chihuahua.) 628 629 Fiji will not observe DST in 2022/3. (Thanks to Shalvin Narayan.) 630 For now, assume DST is suspended indefinitely. 631 632 Changes to data 633 634 Move links to 'backward' to ease and simplify link maintenance. 635 This affects generated data only if you use 'make BACKWARD='. 636 637 GMT is now a Zone and Etc/GMT a link instead of vice versa, 638 as GMT is needed for leap second support whereas Etc/GMT is not. 639 However, this change exposes a bug in TZUpdater 2.3.2 so it is 640 present only in vanguard form for now. 641 642 Vanguard form now uses links to links, as zic now supports this. 643 644 Changes to past timestamps 645 646 Simplify four Ontario zones, as most of the post-1970 differences 647 seem to have been imaginary. (Problem reported by Chris Walton.) 648 Move America/Nipigon, America/Rainy_River, and America/Thunder_Bay 649 to 'backzone'; backward-compatibility links still work, albeit 650 with some different timestamps before November 2005. 651 652 Changes to code 653 654 zic now supports links to links regardless of input line order. 655 For example, if Australia/Sydney is a Zone, the lines 656 Link Australia/Canberra Australia/ACT 657 Link Australia/Sydney Australia/Canberra 658 now work correctly, even though the shell commands 659 ln Australia/Canberra Australia/ACT 660 ln Australia/Sydney Australia/Canberra 661 would fail because the first command attempts to use a link 662 Australia/Canberra that does not exist until after the second 663 command is executed. Previously, zic had unspecified behavior if 664 a Link line's target was another link, and zic often misbehaved if 665 a Link line's target was a later Link line. 666 667 Fix line number in zic's diagnostic for a link to a link. 668 669 Fix a bug that caused localtime to mishandle timestamps starting 670 in the year 2438 when reading data generated by 'zic -b fat' when 671 distant-future DST transitions occur at times given in standard 672 time or in UT, not the usual case of local time. This occurs when 673 the corresponding .zi Rule lines specify DST transitions with TO 674 columns of 'max' and AT columns that end in 's' or 'u'. The 675 number 2438 comes from the 32-bit limit in the year 2038, plus the 676 400-year Gregorian cycle. (Problem reported by Bradley White.) 677 678 On glibc 2.34 and later, which optionally supports 64-bit time_t 679 on platforms like x86 where time_t was traditionally 32 bits, 680 default time_t to 64 instead of 32 bits. This lets functions like 681 localtime support timestamps after the year 2038, and fixes 682 year-2038 problems in zic when accessing files dated after 2038. 683 To continue to limit time_t to 32 bits on these platforms, use 684 "make CFLAGS='-D_TIME_BITS=32'". 685 686 In C code, do not enable large-file support on platforms like AIX 687 and macOS that no longer need it now that tzcode does not use 688 off_t or related functions like 'stat'. Large-file support is 689 still enabled by default on GNU/Linux, as it is needed for 64-bit 690 time_t support. 691 692 In C code, prefer C23 keywords to pre-C23 macros for alignof, 693 bool, false, and true. Also, use the following C23 features if 694 available: __has_include, unreachable. 695 696 zic no longer works around Qt bug 53071, as the relevant Qt 697 releases have been out of support since 2019. This change affects 698 only fat TZif files, as thin files never had the workaround. 699 700 zdump no longer modifies the environ vector when compiled on 701 platforms lacking tm_zone or when compiled with -DUSE_LTZ=0. 702 This avoid undefined behavior on POSIX platforms. 703 704 705 Release 2022e - 2022-10-11 11:13:02 -0700 706 707 Briefly: 708 Jordan and Syria switch from +02/+03 with DST to year-round +03. 709 710 Changes to future timestamps 711 712 Jordan and Syria are abandoning the DST regime and are changing to 713 permanent +03, so they will not fall back from +03 to +02 on 714 2022-10-28. (Thanks to Steffen Thorsen and Issam Al-Zuwairi.) 715 716 Changes to past timestamps 717 718 On 1922-01-01 Tijuana adopted standard time at 00:00, not 01:00. 719 720 Changes to past time zone abbreviations and DST flags 721 722 The temporary advancement of clocks in central Mexico in summer 723 1931 is now treated as daylight saving time, instead of as two 724 changes to standard time. 725 726 727 Release 2022d - 2022-09-23 12:02:57 -0700 728 729 Briefly: 730 Palestine transitions are now Saturdays at 02:00. 731 Simplify three Ukraine zones into one. 732 733 Changes to future timestamps 734 735 Palestine now springs forward and falls back at 02:00 on the 736 first Saturday on or after March 24 and October 24, respectively. 737 This means 2022 falls back 10-29 at 02:00, not 10-28 at 01:00. 738 (Thanks to Heba Hamad.) 739 740 Changes to past timestamps 741 742 Simplify three Ukraine zones to one, since the post-1970 743 differences seem to have been imaginary. Move Europe/Uzhgorod and 744 Europe/Zaporozhye to 'backzone'; backward-compatibility links 745 still work, albeit with different timestamps before October 1991. 746 747 748 Release 2022c - 2022-08-15 17:47:18 -0700 749 750 Briefly: 751 Work around awk bug in FreeBSD, macOS, etc. 752 Improve tzselect on intercontinental Zones. 753 754 Changes to code 755 756 Work around a bug in onetrueawk that broke commands like 757 'make traditional_tarballs' on FreeBSD, macOS, etc. 758 (Problem reported by Deborah Goldsmith.) 759 760 Add code to tzselect that uses experimental structured comments in 761 zone1970.tab to clarify whether Zones like Africa/Abidjan and 762 Europe/Istanbul cross continent or ocean boundaries. 763 (Inspired by a problem reported by Peter Krefting.) 764 765 Fix bug with 'zic -d /a/b/c' when /a is unwritable but the 766 directory /a/b already exists. 767 768 Remove zoneinfo2tdf.pl, as it was unused and triggered false 769 malware alarms on some email servers. 770 771 772 Release 2022b - 2022-08-10 15:38:32 -0700 773 774 Briefly: 775 Chile's DST is delayed by a week in September 2022. 776 Iran no longer observes DST after 2022. 777 Rename Europe/Kiev to Europe/Kyiv. 778 New zic -R option 779 Vanguard form now uses %z. 780 Finish moving duplicate-since-1970 zones to 'backzone'. 781 New build option PACKRATLIST 782 New tailored_tarballs target, replacing rearguard_tarballs 783 784 Changes to future timestamps 785 786 Chile's 2022 DST start is delayed from September 4 to September 11. 787 (Thanks to Juan Correa.) 788 789 Iran plans to stop observing DST permanently, after it falls back 790 on 2022-09-21. (Thanks to Ali Mirjamali.) 791 792 Changes to past timestamps 793 794 Finish moving to 'backzone' the location-based zones whose 795 timestamps since 1970 are duplicates; adjust links accordingly. 796 This change ordinarily affects only pre-1970 timestamps, and with 797 the new PACKRATLIST option it does not affect any timestamps. 798 In this round the affected zones are Antarctica/Vostok, 799 Asia/Brunei, Asia/Kuala_Lumpur, Atlantic/Reykjavik, 800 Europe/Amsterdam, Europe/Copenhagen, Europe/Luxembourg, 801 Europe/Monaco, Europe/Oslo, Europe/Stockholm, Indian/Christmas, 802 Indian/Cocos, Indian/Kerguelen, Indian/Mahe, Indian/Reunion, 803 Pacific/Chuuk, Pacific/Funafuti, Pacific/Majuro, Pacific/Pohnpei, 804 Pacific/Wake and Pacific/Wallis, and the affected links are 805 Arctic/Longyearbyen, Atlantic/Jan_Mayen, Iceland, Pacific/Ponape, 806 Pacific/Truk, and Pacific/Yap. 807 808 From fall 1994 through fall 1995, Shanks wrote that Crimea's 809 DST transitions were at 02:00 standard time, not at 00:00. 810 (Thanks to Michael Deckers.) 811 812 Iran adopted standard time in 1935, not 1946. In 1977 it observed 813 DST from 03-21 23:00 to 10-20 24:00; its 1978 transitions were on 814 03-24 and 08-05, not 03-20 and 10-20; and its spring 1979 815 transition was on 05-27, not 03-21. 816 (Thanks to Roozbeh Pournader and Francis Santoni.) 817 818 Chile's observance of -04 from 1946-08-29 through 1947-03-31 was 819 considered DST, not standard time. Santiago and environs had moved 820 their clocks back to rejoin the rest of mainland Chile; put this 821 change at the end of 1946-08-28. (Thanks to Michael Deckers.) 822 823 Some old, small clock transitions have been removed, as people at 824 the time did not change their clocks. This affects Asia/Hong_Kong 825 in 1904, Asia/Ho_Chi_Minh in 1906, and Europe/Dublin in 1880. 826 827 Changes to zone name 828 829 Rename Europe/Kiev to Europe/Kyiv, as "Kyiv" is more common in 830 English now. Spelling of other names in Ukraine has not yet 831 demonstrably changed in common English practice so for now these 832 names retain old spellings, as in other countries (e.g., 833 Europe/Prague not "Praha", and Europe/Sofia not "Sofiya"). 834 835 Changes to code 836 837 zic has a new option '-R @N' to output explicit transitions < N. 838 (Need suggested by Almaz Mingaleev.) 839 840 'zic -r @N' no longer outputs bad data when N < first transition. 841 (Problem introduced in 2021d and reported by Peter Krefting.) 842 843 zic now checks its input for NUL bytes and unterminated lines, and 844 now supports input line lengths up to 2048 (not 512) bytes. 845 846 gmtime and related code now use the abbreviation "UTC" not "GMT". 847 POSIX is being revised to require this. 848 849 When tzset and related functions set vestigial static variables 850 like tzname, they now prefer specified timestamps to unspecified ones. 851 (Problem reported by Almaz Mingaleev.) 852 853 zic no longer complains "can't determine time zone abbreviation to 854 use just after until time" when a transition to a new standard 855 time occurs simultaneously with the first DST fallback transition. 856 857 Changes to build procedure 858 859 Source data in vanguard form now uses the %z notation, introduced 860 in release 2015f. For example, for America/Sao_Paulo vanguard 861 form contains the zone continuation line "-3:00 Brazil %z", which 862 is simpler and more reliable than the line "-3:00 Brazil -03/-02" 863 used in main and rearguard forms. The plan is for the main form 864 to use %z eventually; in the meantime maintainers of zi parsers 865 are encouraged to test the parsers on vanguard.zi. 866 867 The Makefile has a new PACKRATLIST option to select a subset of 868 'backzone'. For example, 'make PACKRATDATA=backzone 869 PACKRATLIST=zone.tab' now generates TZif files identical to those 870 of the global-tz project. 871 872 The Makefile has a new tailored_tarballs target for generating 873 special-purpose tarballs. It generalizes and replaces the 874 rearguard_tarballs target and related targets and macros, which 875 are now obsolescent. 876 877 'make install' now defaults LOCALTIME to Factory not GMT, 878 which means the default abbreviation is now "-00" not "GMT". 879 880 Remove the posix_packrat target, marked obsolescent in 2016a. 881 882 883 Release 2022a - 2022-03-15 23:02:01 -0700 884 885 Briefly: 886 Palestine will spring forward on 2022-03-27, not -03-26. 887 zdump -v now outputs better failure indications. 888 Bug fixes for code that reads corrupted TZif data. 889 890 Changes to future timestamps 891 892 Palestine will spring forward on 2022-03-27, not 2022-03-26. 893 (Thanks to Heba Hamad.) Predict future transitions for first 894 Sunday >= March 25. Additionally, predict fallbacks to be the first 895 Friday on or after October 23, not October's last Friday, to be more 896 consistent with recent practice. The first differing fallback 897 prediction is on 2025-10-24, not 2025-10-31. 898 899 Changes to past timestamps 900 901 From 1992 through spring 1996, Ukraine's DST transitions were at 902 02:00 standard time, not at 01:00 UTC. (Thanks to Alois Treindl.) 903 904 Chile's Santiago Mean Time and its LMT precursor have been adjusted 905 eastward by 1 second to align with past and present law. 906 907 Changes to commentary 908 909 Add several references for Chile's 1946/1947 transitions, some of 910 which only affected portions of the country. 911 912 Changes to code 913 914 Fix bug when mktime gets confused by truncated TZif files with 915 unspecified local time. (Problem reported by Almaz Mingaleev.) 916 917 Fix bug when 32-bit time_t code reads malformed 64-bit TZif data. 918 (Problem reported by Christos Zoulas.) 919 920 When reading a version 2 or later TZif file, the TZif reader now 921 validates the version 1 header and data block only enough to skip 922 over them, as recommended by RFC 8536 section 4. Also, the TZif 923 reader no longer mistakenly attempts to parse a version 1 TZIf 924 file header as a TZ string. 925 926 zdump -v now outputs "(localtime failed)" and "(gmtime failed)" 927 when local time and UT cannot be determined for a timestamp. 928 929 Changes to build procedure 930 931 Distribution tarballs now use standard POSIX.1-1988 ustar format 932 instead of GNU format. Although the formats are almost identical 933 for these tarballs, ustar headers' magic fields contain "ustar" 934 instead of "ustar ", and their version fields contain "00" instead 935 of " ". The two formats are planned to diverge more significantly 936 for tzdb releases after 2242-03-16 12:56:31 UTC, when the ustar 937 format becomes obsolete and the tarballs switch to pax format, an 938 extension of ustar. For details about these formats, please see 939 "pax - portable archive interchange", IEEE Std 1003.1-2017, 940 <https://pubs.opengroup.org/onlinepubs/9699919799/utilities/pax.html#tag_20_92_13>. 941 942 943 Release 2021e - 2021-10-21 18:41:00 -0700 944 945 Changes to future timestamps 946 947 Palestine will fall back 10-29 (not 10-30) at 01:00. 948 (Thanks to P Chan and Heba Hemad.) 949 950 951 Release 2021d - 2021-10-15 13:48:18 -0700 952 953 Briefly: 954 Fiji suspends DST for the 2021/2022 season. 955 'zic -r' marks unspecified timestamps with "-00". 956 957 Changes to future timestamps 958 959 Fiji will suspend observance of DST for the 2021/2022 season. 960 Assume for now that it will return next year. (Thanks to Jashneel 961 Kumar and P Chan.) 962 963 Changes to code 964 965 'zic -r' now uses "-00" time zone abbreviations for intervals 966 with UT offsets that are unspecified due to -r truncation. 967 This implements a change in draft Internet RFC 8536bis. 968 969 970 Release 2021c - 2021-10-01 14:21:49 -0700 971 972 Briefly: 973 Revert most 2021b changes to 'backward'. 974 Fix 'zic -b fat' bug in pre-1970 32-bit data. 975 Fix two Link line typos. 976 Distribute SECURITY file. 977 978 This release is intended as a bugfix release, to fix compatibility 979 problems and typos reported since 2021b was released. 980 981 Changes to Link directives 982 983 Revert almost all of 2021b's changes to the 'backward' file, 984 by moving Link directives back to where they were in 2021a. 985 Although 'zic' doesn't care which source file contains a Link 986 directive, some downstream uses ran into trouble with the move. 987 (Problem reported by Stephen Colebourne for Joda-Time.) 988 989 Fix typo that linked Atlantic/Jan_Mayen to the wrong location 990 (problem reported by Chris Walton). 991 992 Fix 'backzone' typo that linked America/Virgin to the wrong 993 location (problem reported by Michael Deckers). 994 995 Changes to code 996 997 Fix a bug in 'zic -b fat' that caused old timestamps to be 998 mishandled in 32-bit-only readers (problem reported by Daniel 999 Fischer). 1000 1001 Changes to documentation 1002 1003 Distribute the SECURITY file (problem reported by Andreas Radke). 1004 1005 1006 Release 2021b - 2021-09-24 16:23:00 -0700 1007 1008 Briefly: 1009 Jordan now starts DST on February's last Thursday. 1010 Samoa no longer observes DST. 1011 Merge more location-based Zones whose timestamps agree since 1970. 1012 Move some backward-compatibility links to 'backward'. 1013 Rename Pacific/Enderbury to Pacific/Kanton. 1014 Correct many pre-1993 transitions in Malawi, Portugal, etc. 1015 zic now creates each output file or link atomically. 1016 zic -L no longer omits the POSIX TZ string in its output. 1017 zic fixes for truncation and leap second table expiration. 1018 zic now follows POSIX for TZ strings using all-year DST. 1019 Fix some localtime crashes and bugs in obscure cases. 1020 zdump -v now outputs more-useful boundary cases. 1021 tzfile.5 better matches a draft successor to RFC 8536. 1022 A new file SECURITY. 1023 1024 This release is prompted by recent announcements by Jordan and Samoa. 1025 It incorporates many other changes that had accumulated since 2021a. 1026 However, it omits most proposed changes that merged all Zones 1027 agreeing since 1970, as concerns were raised about doing too many of 1028 these changes at once. It does keeps some of these changes in the 1029 interest of making tzdb more equitable one step at a time; see 1030 "Merge more location-based Zones" below. 1031 1032 Changes to future timestamps 1033 1034 Jordan now starts DST on February's last Thursday. 1035 (Thanks to Steffen Thorsen.) 1036 1037 Samoa no longer observes DST. (Thanks to Geoffrey D. Bennett.) 1038 1039 Changes to zone name 1040 1041 Rename Pacific/Enderbury to Pacific/Kanton. When we added 1042 Enderbury in 1993, we did not know that it is uninhabited and that 1043 Kanton (population two dozen) is the only inhabited location in 1044 that timezone. The old name is now a backward-compatibility link. 1045 1046 Changes to past timestamps 1047 1048 Correct many pre-1993 transitions, fixing entries originally 1049 derived from Shanks, Whitman, and Mundell. The fixes include: 1050 - Barbados: standard time was introduced in 1911, not 1932; and 1051 DST was observed in 1942-1944 1052 - Cook Islands: In 1899 they switched from east to west of GMT, 1053 celebrating Christmas for two days. They (and Niue) switched 1054 to standard time in 1952, not 1901. 1055 - Guyana: corrected LMT for Georgetown; the introduction of 1056 standard time in 1911, not 1915; and corrections to 1975 and 1057 1992 transitions 1058 - Kanton: uninhabited before 1937-08-31 1059 - Niue: only observed -11:20 from 1952 through 1964, then went to 1060 -11 instead of -11:30 1061 - Portugal: DST was observed in 1950 1062 - Tonga: corrected LMT; the introduction of standard time in 1945, 1063 not 1901; and corrections to the transition from +12:20 to +13 1064 in 1961, not 1941 1065 Additional fixes to entries in the 'backzone' file include: 1066 - Enderbury: inhabited only 1860/1885 and 1938-03-06/1942-02-09 1067 - The Gambia: 1933 and 1942 transitions 1068 - Malawi: several 1911 through 1925 transitions 1069 - Sierra Leone: several 1913 through 1941 transitions, and DST 1070 was NOT observed in 1957 through 1962 1071 (Thanks to P Chan, Michael Deckers, Alexander Krivenyshev and 1072 Alois Treindl.) 1073 1074 Merge more location-based Zones whose timestamps agree since 1970, 1075 as pre-1970 timestamps are out of scope. This is part of a 1076 process that has been ongoing since 2013. This does not affect 1077 post-1970 timestamps, and timezone historians who build with 'make 1078 PACKRATDATA=backzone' should see no changes to pre-1970 timestamps. 1079 When merging, keep the most-populous location's data, and move 1080 data for other locations to 'backzone' with a backward 1081 link in 'backward'. For example, move America/Creston data to 1082 'backzone' with a link in 'backward' from America/Phoenix because 1083 the two timezones' timestamps agree since 1970; this change 1084 affects some pre-1968 timestamps in America/Creston because 1085 Creston and Phoenix disagreed before 1968. The affected Zones 1086 are Africa/Accra, America/Atikokan, America/Blanc-Sablon, 1087 America/Creston, America/Curacao, America/Nassau, 1088 America/Port_of_Spain, Antarctica/DumontDUrville, and 1089 Antarctica/Syowa. 1090 1091 Changes to maintenance procedure 1092 1093 The new file SECURITY covers how to report security-related bugs. 1094 1095 Several backward-compatibility links have been moved to the 1096 'backward' file. These links, which range from Africa/Addis_Ababa 1097 to Pacific/Saipan, are only for compatibility with now-obsolete 1098 guidelines suggesting an entry for every ISO 3166 code. 1099 The intercontinental convenience links Asia/Istanbul and 1100 Europe/Nicosia have also been moved to 'backward'. 1101 1102 Changes to code 1103 1104 zic now creates each output file or link atomically, 1105 possibly by creating a temporary file and then renaming it. 1106 This avoids races where a TZ setting would temporarily stop 1107 working while zic was installing a replacement file or link. 1108 1109 zic -L no longer omits the POSIX TZ string in its output. 1110 Starting with 2020a, zic -L truncated its output according to the 1111 "Expires" directive or "#expires" comment in the leapseconds file. 1112 The resulting TZif files omitted daylight saving transitions after 1113 the leap second table expired, which led to far less accurate 1114 predictions of times after the expiry. Although future timestamps 1115 cannot be converted accurately in the presence of leap seconds, it 1116 is more accurate to convert near-future timestamps with a few 1117 seconds error than with an hour error, so zic -L no longer 1118 truncates output in this way. 1119 1120 Instead, when zic -L is given the "Expires" directive, it now 1121 outputs the expiration by appending a no-change entry to the leap 1122 second table. Although this should work well with most TZif 1123 readers, it does not conform to Internet RFC 8536 and some pickier 1124 clients (including tzdb 2017c through 2021a) reject it, so 1125 "Expires" directives are currently disabled by default. To enable 1126 them, set the EXPIRES_LINE Makefile variable. If a TZif file uses 1127 this new feature it is marked with a new TZif version number 4, 1128 a format intended to be documented in a successor to RFC 8536. 1129 The old-format "#expires" comments are now treated solely as 1130 comments and have no effect on the TZif files. 1131 1132 zic -L LEAPFILE -r @LO no longer generates an invalid TZif file 1133 that omits leap second information for the range LO..B when LO 1134 falls between two leap seconds A and B. Instead, it generates a 1135 TZif version 4 file that represents the previously missing 1136 information. 1137 1138 The TZif reader now allows the leap second table to begin with a 1139 correction other than -1 or +1, and to contain adjacent 1140 transitions with equal corrections. This supports TZif version 4. 1141 1142 The TZif reader now lets leap seconds occur less than 28 days 1143 apart. This supports possible future TZif extensions. 1144 1145 Fix bug that caused 'localtime' etc. to crash when TZ was 1146 set to a all-year DST string like "EST5EDT4,0/0,J365/25" that does 1147 not conform to POSIX but does conform to Internet RFC 8536. 1148 1149 Fix another bug that caused 'localtime' etc. to crash when TZ was 1150 set to a POSIX-conforming but unusual TZ string like 1151 "EST5EDT4,0/0,J365/0", where almost all the year is DST. 1152 1153 Fix yet another bug that caused 'localtime' etc. to mishandle slim 1154 TZif files containing leap seconds after the last explicit 1155 transition in the table, or when handling far-future timestamps 1156 in slim TZif files lacking leap seconds. 1157 1158 Fix localtime misbehavior involving positive leap seconds. 1159 This change affects only behavior for "right" system time, 1160 which contains leap seconds, and only if the UT offset is 1161 not a multiple of 60 seconds when a positive leap second occurs. 1162 (No such timezone exists in tzdb, luckily.) Without the fix, 1163 the timestamp was ambiguous during a positive leap second. 1164 With the fix, any seconds occurring after a positive leap second 1165 and within the same localtime minute are counted through 60, not 1166 through 59; their UT offset (tm_gmtoff) is the same as before. 1167 Here is how the fix affects timestamps in a timezone with UT 1168 offset +01:23:45 (5025 seconds) and with a positive leap second at 1169 1972-06-30 23:59:60 UTC (78796800): 1170 1171 time_t without the fix with the fix 1172 78796800 1972-07-01 01:23:45 1972-07-01 01:23:45 (leap second) 1173 78796801 1972-07-01 01:23:45 1972-07-01 01:23:46 1174 ... 1175 78796815 1972-07-01 01:23:59 1972-07-01 01:23:60 1176 78796816 1972-07-01 01:24:00 1972-07-01 01:24:00 1177 1178 Fix an unlikely bug that caused 'localtime' etc. to misbehave if 1179 civil time changes a few seconds before time_t wraps around, when 1180 leap seconds are enabled. 1181 1182 Fix bug in zic -r; in some cases, the dummy time type after the 1183 last time transition disagreed with the TZ string, contrary to 1184 Internet RFC 8563 section 3.3. 1185 1186 Fix a bug with 'zic -r @X' when X is a negative leap second that 1187 has a nonnegative correction. Without the fix, the output file 1188 was truncated so that X appeared to be a positive leap second. 1189 Fix a similar, even less likely bug when truncating at a positive 1190 leap second that has a nonpositive correction. 1191 1192 zic -r now reports an error if given rolling leap seconds, as this 1193 usage has never generally worked and is evidently unused. 1194 1195 zic now generates a POSIX-conforming TZ string for TZif files 1196 where all-year DST is predicted for the indefinite future. 1197 For example, for all-year Eastern Daylight Time, zic now generates 1198 "XXX3EDT4,0/0,J365/23" where it previously generated 1199 "EST5EDT,0/0,J365/25" or "". (Thanks to Michael Deckers for 1200 noting the possibility of POSIX conformance.) 1201 1202 zic.c no longer requires sys/wait.h (thanks to spazmodius for 1203 noting it wasn't needed). 1204 1205 When reading slim TZif files, zdump no longer mishandles leap 1206 seconds on the rare platforms where time_t counts leap seconds, 1207 fixing a bug introduced in 2014g. 1208 1209 zdump -v now outputs timestamps at boundaries of what localtime 1210 and gmtime can represent, instead of the less useful timestamps 1211 one day after the minimum and one day before the maximum. 1212 (Thanks to Arthur David Olson for prototype code, and to Manuela 1213 Friedrich for debugging help.) 1214 1215 zdump's -c and -t options are now consistently inclusive for the 1216 lower time bound and exclusive for the upper. Formerly they were 1217 inconsistent. (Confusion noted by Martin Burnicki.) 1218 1219 Changes to build procedure 1220 1221 You can now compile with -DHAVE_MALLOC_ERRNO=0 to port to 1222 non-POSIX hosts where malloc doesn't set errno. 1223 (Problem reported by Jan Engelhardt.) 1224 1225 Changes to documentation 1226 1227 tzfile.5 better matches a draft successor to RFC 8536 1228 <https://datatracker.ietf.org/doc/draft-murchison-rfc8536bis/01/>. 1229 1230 1231 Release 2021a - 2021-01-24 10:54:57 -0800 1232 1233 Changes to future timestamps 1234 1235 South Sudan changes from +03 to +02 on 2021-02-01 at 00:00. 1236 (Thanks to Steffen Thorsen.) 1237 1238 1239 Release 2020f - 2020-12-29 00:17:46 -0800 1240 1241 Change to build procedure 1242 1243 'make rearguard_tarballs' no longer generates a bad rearguard.zi, 1244 fixing a 2020e bug. (Problem reported by Deborah Goldsmith.) 1245 1246 1247 Release 2020e - 2020-12-22 15:14:34 -0800 1248 1249 Briefly: 1250 Volgograd switches to Moscow time on 2020-12-27 at 02:00. 1251 1252 Changes to future timestamps 1253 1254 Volgograd changes time zone from +04 to +03 on 2020-12-27 at 02:00. 1255 (Thanks to Alexander Krivenyshev and Stepan Golosunov.) 1256 1257 Changes to past timestamps 1258 1259 Correct many pre-1986 transitions, fixing entries originally 1260 derived from Shanks. The fixes include: 1261 - Australia: several 1917 through 1971 transitions 1262 - The Bahamas: several 1941 through 1945 transitions 1263 - Bermuda: several 1917 through 1956 transitions 1264 - Belize: several 1942 through 1968 transitions 1265 - Ghana: several 1915 through 1956 transitions 1266 - Israel and Palestine: several 1940 through 1985 transitions 1267 - Kenya and adjacent: several 1908 through 1960 transitions 1268 - Nigeria and adjacent: correcting LMT in Lagos, and several 1905 1269 through 1919 transitions 1270 - Seychelles: the introduction of standard time in 1907, not 1906 1271 - Vanuatu: DST in 1973-1974, and a corrected 1984 transition 1272 (Thanks to P Chan.) 1273 1274 Because of the Australia change, Australia/Currie (King Island) is 1275 no longer needed, as it is identical to Australia/Hobart for all 1276 timestamps since 1970 and was therefore created by mistake. 1277 Australia/Currie has been moved to the 'backward' file and its 1278 corrected data moved to the 'backzone' file. 1279 1280 Changes to past time zone abbreviations and DST flags 1281 1282 To better match legislation in Turks and Caicos, the 2015 shift to 1283 year-round observance of -04 is now modeled as AST throughout before 1284 returning to Eastern Time with US DST in 2018, rather than as 1285 maintaining EDT until 2015-11-01. (Thanks to P Chan.) 1286 1287 Changes to documentation 1288 1289 The zic man page now documents zic's coalescing of transitions 1290 when a zone falls back just before DST springs forward. 1291 1292 1293 Release 2020d - 2020-10-21 11:24:13 -0700 1294 1295 Briefly: 1296 Palestine ends DST earlier than predicted, on 2020-10-24. 1297 1298 Changes to past and future timestamps 1299 1300 Palestine ends DST on 2020-10-24 at 01:00, instead of 2020-10-31 1301 as previously predicted (thanks to Sharef Mustafa.) Its 1302 2019-10-26 fall-back was at 00:00, not 01:00 (thanks to Steffen 1303 Thorsen.) Its 2015-10-23 transition was at 01:00 not 00:00, and 1304 its spring 2020 transition was on March 28 at 00:00, not March 27 1305 (thanks to Pierre Cashon.) This affects Asia/Gaza and 1306 Asia/Hebron. Assume future spring and fall transitions will be on 1307 the Saturday preceding the last Sunday of March and October, 1308 respectively. 1309 1310 1311 Release 2020c - 2020-10-16 11:15:53 -0700 1312 1313 Briefly: 1314 Fiji starts DST later than usual, on 2020-12-20. 1315 1316 Changes to future timestamps 1317 1318 Fiji will start DST on 2020-12-20, instead of 2020-11-08 as 1319 previously predicted. DST will still end on 2021-01-17. 1320 (Thanks to Raymond Kumar and Alan Mintz.) Assume for now that 1321 the later-than-usual start date is a one-time departure from the 1322 recent pattern. 1323 1324 Changes to build procedure 1325 1326 Rearguard tarballs now contain an empty file pacificnew. 1327 Some older downstream software expects this file to exist. 1328 (Problem reported by Mike Cullinan.) 1329 1330 1331 Release 2020b - 2020-10-06 18:35:04 -0700 1332 1333 Briefly: 1334 Revised predictions for Morocco's changes starting in 2023. 1335 Canada's Yukon changes to -07 on 2020-11-01, not 2020-03-08. 1336 Macquarie Island has stayed in sync with Tasmania since 2011. 1337 Casey, Antarctica is at +08 in winter and +11 in summer. 1338 zic no longer supports -y, nor the TYPE field of Rules. 1339 1340 Changes to future timestamps 1341 1342 Morocco's spring-forward after Ramadan is now predicted to occur 1343 no sooner than two days after Ramadan, instead of one day. 1344 (Thanks to Milamber.) The first altered prediction is for 2023, 1345 now predicted to spring-forward on April 30 instead of April 23. 1346 1347 Changes to past and future timestamps 1348 1349 Casey Station, Antarctica has been using +08 in winter and +11 in 1350 summer since 2018. The most recent transition from +08 to +11 was 1351 2020-10-04 00:01. Also, Macquarie Island has been staying in 1352 sync with Tasmania since 2011. (Thanks to Steffen Thorsen.) 1353 1354 Changes to past and future time zone abbreviations and DST flags 1355 1356 Canada's Yukon, represented by America/Whitehorse and 1357 America/Dawson, changes its time zone rules from -08/-07 to 1358 permanent -07 on 2020-11-01, not on 2020-03-08 as 2020a had it. 1359 This change affects only the time zone abbreviation (MST vs PDT) 1360 and daylight saving flag for the period between the two dates. 1361 (Thanks to Andrew G. Smith.) 1362 1363 Changes to past timestamps 1364 1365 Correct several transitions for Hungary for 1918/1983. 1366 For example, the 1983-09-25 fall-back was at 01:00, not 03:00. 1367 (Thanks to Gza Nyry.) Also, the 1890 transition to standard 1368 time was on 11-01, not 10-01 (thanks to Michael Deckers). 1369 1370 The 1891 French transition was on March 16, not March 15. The 1371 1911-03-11 French transition was at midnight, not a minute later. 1372 Monaco's transitions were on 1892-06-01 and 1911-03-29, not 1373 1891-03-15 and 1911-03-11. (Thanks to Michael Deckers.) 1374 1375 Changes to code 1376 1377 Support for zic's long-obsolete '-y YEARISTYPE' option has been 1378 removed and, with it, so has support for the TYPE field in Rule 1379 lines, which is now reserved for compatibility with earlier zic. 1380 These features were previously deprecated in release 2015f. 1381 (Thanks to Tim Parenti.) 1382 1383 zic now defaults to '-b slim' instead of to '-b fat'. 1384 1385 zic's new '-l -' and '-p -' options uninstall any existing 1386 localtime and posixrules files, respectively. 1387 1388 The undocumented and ineffective tzsetwall function has been 1389 removed. 1390 1391 Changes to build procedure 1392 1393 The Makefile now defaults POSIXRULES to '-', so the posixrules 1394 feature (obsolete as of 2019b) is no longer installed by default. 1395 1396 Changes to documentation and commentary 1397 1398 The long-obsolete files pacificnew, systemv, and yearistype.sh have 1399 been removed from the distribution. (Thanks to Tim Parenti.) 1400 1401 1402 Release 2020a - 2020-04-23 16:03:47 -0700 1403 1404 Briefly: 1405 Morocco springs forward on 2020-05-31, not 2020-05-24. 1406 Canada's Yukon advanced to -07 year-round on 2020-03-08. 1407 America/Nuuk renamed from America/Godthab. 1408 zic now supports expiration dates for leap second lists. 1409 1410 Changes to future timestamps 1411 1412 Morocco's second spring-forward transition in 2020 will be May 31, 1413 not May 24 as predicted earlier. (Thanks to Semlali Naoufal.) 1414 Adjust future-year predictions to use the first Sunday after the 1415 day after Ramadan, not the first Sunday after Ramadan. 1416 1417 Canada's Yukon, represented by America/Whitehorse and 1418 America/Dawson, advanced to -07 year-round, beginning with its 1419 spring-forward transition on 2020-03-08, and will not fall back on 1420 2020-11-01. Although a government press release calls this 1421 "permanent Pacific Daylight Saving Time", we prefer MST for 1422 consistency with nearby Dawson Creek, Creston, and Fort Nelson. 1423 (Thanks to Tim Parenti.) 1424 1425 Changes to past timestamps 1426 1427 Shanghai observed DST in 1919. (Thanks to Phake Nick.) 1428 1429 Changes to timezone identifiers 1430 1431 To reflect current usage in English better, America/Godthab has 1432 been renamed to America/Nuuk. A backwards-compatibility link 1433 remains for the old name. 1434 1435 Changes to code 1436 1437 localtime.c no longer mishandles timestamps after the last 1438 transition in a TZif file with leap seconds and with daylight 1439 saving time transitions projected into the indefinite future. 1440 For example, with TZ='America/Los_Angeles' with leap seconds, 1441 zdump formerly reported a DST transition on 2038-03-14 1442 from 01:59:32.999... to 02:59:33 instead of the correct transition 1443 from 01:59:59.999... to 03:00:00. 1444 1445 zic -L now supports an Expires line in the leapseconds file, and 1446 truncates the TZif output accordingly. This propagates leap 1447 second expiration information into the TZif file, and avoids the 1448 abovementioned localtime.c bug as well as similar bugs present in 1449 many client implementations. If no Expires line is present, zic 1450 -L instead truncates the TZif output based on the #expires comment 1451 present in leapseconds files distributed by tzdb 2018f and later; 1452 however, this usage is obsolescent. For now, the distributed 1453 leapseconds file has an Expires line that is commented out, so 1454 that the file can be fed to older versions of zic which ignore the 1455 commented-out line. Future tzdb distributions are planned to 1456 contain a leapseconds file with an Expires line. 1457 1458 The configuration macros HAVE_TZNAME and USG_COMPAT should now be 1459 set to 1 if the system library supports the feature, and 2 if not. 1460 As before, these macros are nonzero if tzcode should support the 1461 feature, zero otherwise. 1462 1463 The configuration macro ALTZONE now has the same values with the 1464 same meaning as HAVE_TZNAME and USG_COMPAT. 1465 1466 The code's defense against CRLF in leap-seconds.list is now 1467 portable to POSIX awk. (Problem reported by Deborah Goldsmith.) 1468 1469 Although the undocumented tzsetwall function is not changed in 1470 this release, it is now deprecated in preparation for removal in 1471 future releases. Due to POSIX requirements, tzsetwall has not 1472 worked for some time. Any code that uses it should instead use 1473 tzalloc(NULL) or, if portability trumps thread-safety, should 1474 unset the TZ environment variable. 1475 1476 Changes to commentary 1477 1478 The les-de-la-Madeleine and the Listuguj reserve are noted as 1479 following America/Halifax, and comments about Yukon's "south" and 1480 "north" have been corrected to say "east" and "west". (Thanks to 1481 Jeffery Nichols.) 1482 1483 1484 Release 2019c - 2019-09-11 08:59:48 -0700 1485 1486 Briefly: 1487 Fiji observes DST from 2019-11-10 to 2020-01-12. 1488 Norfolk Island starts observing Australian-style DST. 1489 1490 Changes to future timestamps 1491 1492 Fiji's next DST transitions will be 2019-11-10 and 2020-01-12 1493 instead of 2019-11-03 and 2020-01-19. (Thanks to Raymond Kumar.) 1494 Adjust future guesses accordingly. 1495 1496 Norfolk Island will observe Australian-style DST starting in 1497 spring 2019. The first transition is on 2019-10-06. (Thanks to 1498 Kyle Czech and Michael Deckers.) 1499 1500 Changes to past timestamps 1501 1502 Many corrections to time in Turkey from 1940 through 1985. 1503 (Thanks to Oya Vula via Alois Treindl, and to Kvan Yazan.) 1504 1505 The Norfolk Island 1975-03-02 transition was at 02:00 standard 1506 time, not 02:00 DST. (Thanks to Michael Deckers.) 1507 1508 South Korea observed DST from 1948 through 1951. Although this 1509 info was supposed to appear in release 2014j, a typo inadvertently 1510 suppressed the change. (Thanks to Alois Treindl.) 1511 1512 Detroit observed DST in 1967 and 1968 following the US DST rules, 1513 except that its 1967 DST began on June 14 at 00:01. (Thanks to 1514 Alois Treindl for pointing out that the old data entries were 1515 probably wrong.) 1516 1517 Fix several errors in pre-1970 transitions in Perry County, IN. 1518 (Thanks to Alois Treindl for pointing out the 1967/9 errors.) 1519 1520 Edmonton did not observe DST in 1967 or 1969. In 1946 Vancouver 1521 ended DST on 09-29 not 10-13, and Vienna ended DST on 10-07 not 1522 10-06. In 1945 Knigsberg (now Kaliningrad) switched from +01/+02 1523 to +02/+03 on 04-10 not 01-01, and its +02/+03 is abbreviated 1524 EET/EEST, not CET/CEST. (Thanks to Alois Treindl.) In 1946 1525 Knigsberg switched to +03 on 04-07 not 01-01. 1526 1527 In 1946 Louisville switched from CST to CDT on 04-28 at 00:01, not 1528 01-01 at 00:00. (Thanks to Alois Treindl and Michael Deckers.) 1529 Also, it switched from CST to CDT on 1950-04-30, not 1947-04-27. 1530 1531 The 1892-05-01 transition in Brussels was at 00:17:30, not at noon. 1532 (Thanks to Michael Deckers.) 1533 1534 Changes to past time zone abbreviations and DST flags 1535 1536 Hong Kong Winter Time, observed from 1941-10-01 to 1941-12-25, 1537 is now flagged as DST and is abbreviated HKWT not HKT. 1538 1539 Changes to code 1540 1541 leapseconds.awk now relies only on its input data, rather than 1542 also relying on its comments. (Inspired by code from Dennis 1543 Ferguson and Chris Woodbury.) 1544 1545 The code now defends against CRLFs in leap-seconds.list. 1546 (Thanks to Brian Inglis and Chris Woodbury.) 1547 1548 Changes to documentation and commentary 1549 1550 theory.html discusses leap seconds. (Thanks to Steve Summit.) 1551 1552 Nashville's newspapers dueled about the time of day in the 1950s. 1553 (Thanks to John Seigenthaler.) 1554 1555 Liechtenstein observed Swiss DST in 1941/2. 1556 (Thanks to Alois Treindl.) 1557 1558 1559 Release 2019b - 2019-07-01 00:09:53 -0700 1560 1561 Briefly: 1562 Brazil no longer observes DST. 1563 'zic -b slim' outputs smaller TZif files; please try it out. 1564 Palestine's 2019 spring-forward transition was on 03-29, not 03-30. 1565 1566 Changes to future timestamps 1567 1568 Brazil has canceled DST and will stay on standard time indefinitely. 1569 (Thanks to Steffen Thorsen, Marcus Diniz, and Daniel Soares de 1570 Oliveira.) 1571 1572 Predictions for Morocco now go through 2087 instead of 2037, to 1573 work around a problem on newlib when using TZif files output by 1574 zic 2019a or earlier. (Problem reported by David Gauchard.) 1575 1576 Changes to past and future timestamps 1577 1578 Palestine's 2019 spring transition was 03-29 at 00:00, not 03-30 1579 at 01:00. (Thanks to Sharef Mustafa and Even Scharning.) Guess 1580 future transitions to be March's last Friday at 00:00. 1581 1582 Changes to past timestamps 1583 1584 Hong Kong's 1941-06-15 spring-forward transition was at 03:00, not 1585 03:30. Its 1945 transition from JST to HKT was on 11-18 at 02:00, 1586 not 09-15 at 00:00. In 1946 its spring-forward transition was on 1587 04-21 at 00:00, not the previous day at 03:30. From 1946 through 1588 1952 its fall-back transitions occurred at 04:30, not at 03:30. 1589 In 1947 its fall-back transition was on 11-30, not 12-30. 1590 (Thanks to P Chan.) 1591 1592 Changes to past time zone abbreviations 1593 1594 Italy's 1866 transition to Rome Mean Time was on December 12, not 1595 September 22. This affects only the time zone abbreviation for 1596 Europe/Rome between those dates. (Thanks to Stephen Trainor and 1597 Luigi Rosa.) 1598 1599 Changes affecting metadata only 1600 1601 Add info about the Crimea situation in zone1970.tab and zone.tab. 1602 (Problem reported by Serhii Demediuk.) 1603 1604 Changes to code 1605 1606 zic's new -b option supports a way to control data bloat and to 1607 test for year-2038 bugs in software that reads TZif files. 1608 'zic -b fat' and 'zic -b slim' generate larger and smaller output; 1609 for example, changing from fat to slim shrinks the Europe/London 1610 file from 3648 to 1599 bytes, saving about 56%. Fat and slim 1611 files represent the same set of timestamps and use the same TZif 1612 format as documented in tzfile(5) and in Internet RFC 8536. 1613 Fat format attempts to work around bugs or incompatibilities in 1614 older software, notably software that mishandles 64-bit TZif data 1615 or uses obsolete TZ strings like "EET-2EEST" that lack DST rules. 1616 Slim format is more efficient and does not work around 64-bit bugs 1617 or obsolete TZ strings. Currently zic defaults to fat format 1618 unless you compile with -DZIC_BLOAT_DEFAULT=\"slim\"; this 1619 out-of-the-box default is intended to change in future releases 1620 as the buggy software often mishandles timestamps anyway. 1621 1622 zic no longer treats a set of rules ending in 2037 specially. 1623 Previously, zic assumed that such a ruleset meant that future 1624 timestamps could not be predicted, and therefore omitted a 1625 POSIX-like TZ string in the TZif output. The old behavior is no 1626 longer needed for current tzdata, and caused problems with newlib 1627 when used with older tzdata (reported by David Gauchard). 1628 1629 zic no longer generates some artifact transitions. For example, 1630 Europe/London no longer has a no-op transition in January 1996. 1631 1632 Changes to build procedure 1633 1634 tzdata.zi now assumes zic 2017c or later. This shrinks tzdata.zi 1635 by a percent or so. 1636 1637 Changes to documentation and commentary 1638 1639 The Makefile now documents the POSIXRULES macro as being obsolete, 1640 and similarly, zic's -p POSIXRULES option is now documented as 1641 being obsolete. Although the POSIXRULES feature still exists and 1642 works as before, in practice it is rarely used for its intended 1643 purpose, and it does not work either in the default reference 1644 implementation (for timestamps after 2037) or in common 1645 implementations such as GNU/Linux (for contemporary timestamps). 1646 Since POSIXRULES was designed primarily as a temporary transition 1647 facility for System V platforms that died off decades ago, it is 1648 being decommissioned rather than institutionalized. 1649 1650 New info on Bonin Islands and Marcus (thanks to Wakaba and Phake Nick). 1651 1652 1653 Release 2019a - 2019-03-25 22:01:33 -0700 1654 1655 Briefly: 1656 Palestine "springs forward" on 2019-03-30 instead of 2019-03-23. 1657 Metlakatla "fell back" to rejoin Alaska Time on 2019-01-20 at 02:00. 1658 1659 Changes to past and future timestamps 1660 1661 Palestine will not start DST until 2019-03-30, instead of 2019-03-23 as 1662 previously predicted. Adjust our prediction by guessing that spring 1663 transitions will be between 24 and 30 March, which matches recent practice 1664 since 2016. (Thanks to Even Scharning and Tim Parenti.) 1665 1666 Metlakatla ended its observance of Pacific standard time, 1667 rejoining Alaska Time, on 2019-01-20 at 02:00. (Thanks to Ryan 1668 Stanley and Tim Parenti.) 1669 1670 Changes to past timestamps 1671 1672 Israel observed DST in 1980 (08-02/09-13) and 1984 (05-05/08-25). 1673 (Thanks to Alois Treindl and Isaac Starkman.) 1674 1675 Changes to time zone abbreviations 1676 1677 Etc/UCT is now a backward-compatibility link to Etc/UTC, instead 1678 of being a separate zone that generates the abbreviation "UCT", 1679 which nowadays is typically a typo. (Problem reported by Isiah 1680 Meadows.) 1681 1682 Changes to code 1683 1684 zic now has an -r option to limit the time range of output data. 1685 For example, 'zic -r @1000000000' limits the output data to 1686 timestamps starting 1000000000 seconds after the Epoch. 1687 This helps shrink output size and can be useful for applications 1688 not needing the full timestamp history, such as TZDIST truncation; 1689 see Internet RFC 8536 section 5.1. (Inspired by a feature request 1690 from Christopher Wong, helped along by bug reports from Wong and 1691 from Tim Parenti.) 1692 1693 Changes to documentation 1694 1695 Mention Internet RFC 8536 (February 2019), which documents TZif. 1696 1697 tz-link.html now cites tzdata-meta 1698 <https://tzdata-meta.timtimeonline.com/>. 1699 1700 1701 Release 2018i - 2018-12-30 11:05:43 -0800 1702 1703 Briefly: 1704 So Tom and Prncipe switches from +01 to +00 on 2019-01-01. 1705 1706 Changes to future timestamps 1707 1708 Due to a change in government, So Tom and Prncipe switches back 1709 from +01 to +00 on 2019-01-01 at 02:00. (Thanks to Vadim 1710 Nasardinov and Michael Deckers.) 1711 1712 1713 Release 2018h - 2018-12-23 17:59:32 -0800 1714 1715 Briefly: 1716 Qyzylorda, Kazakhstan moved from +06 to +05 on 2018-12-21. 1717 New zone Asia/Qostanay because Qostanay, Kazakhstan didn't move. 1718 Metlakatla, Alaska observes PST this winter only. 1719 Guess Morocco will continue to adjust clocks around Ramadan. 1720 Add predictions for Iran from 2038 through 2090. 1721 1722 Changes to future timestamps 1723 1724 Guess that Morocco will continue to fall back just before and 1725 spring forward just after Ramadan, the practice since 2012. 1726 (Thanks to Maamar Abdelkader.) This means Morocco will observe 1727 negative DST during Ramadan in main and vanguard formats, and in 1728 rearguard format it stays in the +00 timezone and observes 1729 ordinary DST in all months other than Ramadan. As before, extend 1730 this guesswork to the year 2037. As a consequence, Morocco is 1731 scheduled to observe three DST transitions in some Gregorian years 1732 (e.g., 2033) due to the mismatch between the Gregorian and Islamic 1733 calendars. 1734 1735 The table of exact transitions for Iranian DST has been extended. 1736 It formerly cut off before the year 2038 in a nod to 32-bit time_t. 1737 It now cuts off before 2091 as there is doubt about how the Persian 1738 calendar will treat 2091. This change predicts DST transitions in 1739 2038-9, 2042-3, and 2046-7 to occur one day later than previously 1740 predicted. As before, post-cutoff transitions are approximated. 1741 1742 Changes to past and future timestamps 1743 1744 Qyzylorda (aka Kyzylorda) oblast in Kazakhstan moved from +06 to 1745 +05 on 2018-12-21. This is a zone split as Qostanay (aka 1746 Kostanay) did not switch, so create a zone Asia/Qostanay. 1747 1748 Metlakatla moved from Alaska to Pacific standard time on 2018-11-04. 1749 It did not change clocks that day and remains on -08 this winter. 1750 (Thanks to Ryan Stanley.) It will revert to the usual Alaska 1751 rules next spring, so this change affects only timestamps 1752 from 2018-11-04 through 2019-03-10. 1753 1754 Change to past timestamps 1755 1756 Kwajalein's 1993-08-20 transition from -12 to +12 was at 24:00, 1757 not 00:00. I transcribed the time incorrectly from Shanks. 1758 (Thanks to Phake Nick.) 1759 1760 Nauru's 1979 transition was on 02-10 at 02:00, not 05-01 at 00:00. 1761 (Thanks to Phake Nick.) 1762 1763 Guam observed DST irregularly from 1959 through 1977. 1764 (Thanks to Phake Nick.) 1765 1766 Hong Kong observed DST in 1941 starting 06-15 (not 04-01), then on 1767 10-01 changed standard time to +08:30 (not +08). Its transition 1768 back to +08 after WWII was on 1945-09-15, not the previous day. 1769 Its 1904-10-30 change took effect at 01:00 +08 (not 00:00 LMT). 1770 (Thanks to Phake Nick, Steve Allen, and Joseph Myers.) Also, 1771 its 1952 fallback was on 11-02 (not 10-25). 1772 1773 This release contains many changes to timestamps before 1946 due 1774 to Japanese possession or occupation of Pacific/Chuuk, 1775 Pacific/Guam, Pacific/Kosrae, Pacific/Kwajalein, Pacific/Majuro, 1776 Pacific/Nauru, Pacific/Palau, and Pacific/Pohnpei. 1777 (Thanks to Phake Nick.) 1778 1779 Assume that the Spanish East Indies was like the Philippines and 1780 observed American time until the end of 1844. This affects 1781 Pacific/Chuuk, Pacific/Kosrae, Pacific/Palau, and Pacific/Pohnpei. 1782 1783 Changes to past tm_isdst flags 1784 1785 For the recent Morocco change, the tm_isdst flag should be 1 from 1786 2018-10-27 00:00 to 2018-10-28 03:00. (Thanks to Michael Deckers.) 1787 Give a URL to the official decree. (Thanks to Matt Johnson.) 1788 1789 1790 Release 2018g - 2018-10-26 22:22:45 -0700 1791 1792 Briefly: 1793 Morocco switches to permanent +01 on 2018-10-28. 1794 1795 Changes to future timestamps 1796 1797 Morocco switches from +00/+01 to permanent +01 effective 2018-10-28, 1798 so its clocks will not fall back as previously scheduled. 1799 (Thanks to Mohamed Essedik Najd and Brian Inglis.) 1800 1801 Changes to code 1802 1803 When generating TZif files with leap seconds, zic no longer uses a 1804 format that trips up older 32-bit clients, fixing a bug introduced 1805 in 2018f. (Reported by Daniel Fischer.) Also, the zic workaround 1806 for QTBUG-53071 now also works for TZif files with leap seconds. 1807 1808 The translator to rearguard format now rewrites the line 1809 "Rule Japan 1948 1951 - Sep Sat>=8 25:00 0 S" to 1810 "Rule Japan 1948 1951 - Sep Sun>=9 1:00 0 S". 1811 This caters to zic before 2007 and to Oracle TZUpdater 2.2.0 1812 and earlier. (Reported by Christos Zoulas.) 1813 1814 Changes to past time zone abbreviations 1815 1816 Change HDT to HWT/HPT for WWII-era abbreviations in Hawaii. 1817 This reverts to 2011h, as the abbreviation change in 2011i was 1818 likely inadvertent. 1819 1820 Changes to documentation 1821 1822 tzfile.5 has new sections on interoperability issues. 1823 1824 1825 Release 2018f - 2018-10-18 00:14:18 -0700 1826 1827 Briefly: 1828 Volgograd moves from +03 to +04 on 2018-10-28. 1829 Fiji ends DST 2019-01-13, not 2019-01-20. 1830 Most of Chile changes DST dates, effective 2019-04-06. 1831 1832 Changes to future timestamps 1833 1834 Volgograd moves from +03 to +04 on 2018-10-28 at 02:00. 1835 (Thanks to Alexander Fetisov and Stepan Golosunov.) 1836 1837 Fiji ends DST 2019-01-13 instead of the 2019-01-20 previously 1838 predicted. (Thanks to Raymond Kumar.) Adjust future predictions 1839 accordingly. 1840 1841 Most of Chile will end DST on the first Saturday in April at 24:00 mainland 1842 time, and resume DST on the first Saturday in September at 24:00 mainland 1843 time. The changes are effective from 2019-04-06, and do not affect the 1844 Magallanes region modeled by America/Punta_Arenas. (Thanks to Juan Correa 1845 and Tim Parenti.) Adjust future predictions accordingly. 1846 1847 Changes to past timestamps 1848 1849 The 2018-05-05 North Korea 30-minute time zone change took place 1850 at 23:30 the previous day, not at 00:00 that day. 1851 1852 China's 1988 spring-forward transition was on April 17, not 1853 April 10. Its DST transitions in 1986/91 were at 02:00, not 00:00. 1854 (Thanks to P Chan.) 1855 1856 Fix several issues for Macau before 1992. Macau's pre-1904 LMT 1857 was off by 10 s. Macau switched to +08 in 1904 not 1912, and 1858 temporarily switched to +09/+10 during World War II. Macau 1859 observed DST in 1942/79, not 1961/80, and there were several 1860 errors for transition times and dates. (Thanks to P Chan.) 1861 1862 The 1948-1951 fallback transitions in Japan were at 25:00 on 1863 September's second Saturday, not at 24:00. (Thanks to Phake Nick.) 1864 zic turns this into 01:00 on the day after September's second 1865 Saturday, which is the best that POSIX or C platforms can do. 1866 1867 Incorporate 1940-1949 Asia/Shanghai DST transitions from a 2014 1868 paper by Li Yu, replacing more-questionable data from Shanks. 1869 1870 Changes to time zone abbreviations 1871 1872 Use "PST" and "PDT" for Philippine time. (Thanks to Paul Goyette.) 1873 1874 Changes to code 1875 1876 zic now always generates TZif files where time type 0 is used for 1877 timestamps before the first transition. This simplifies the 1878 reading of TZif files and should not affect behavior of existing 1879 TZif readers because the same set of time types is used; only 1880 their internal indexes may have changed. This affects only the 1881 legacy zones EST5EDT, CST6CDT, MST7MDT, PST8PDT, CET, MET, and 1882 EET, which previously used nonzero types for these timestamps. 1883 1884 Because of the type 0 change, zic no longer outputs a dummy 1885 transition at time -2**59 (before the Big Bang), as clients should 1886 no longer need this to handle historical timestamps correctly. 1887 This reverts a change introduced in 2013d and shrinks most TZif 1888 files by a few bytes. 1889 1890 zic now supports negative time-of-day in Rule and Leap lines, e.g., 1891 "Rule X min max - Apr lastSun -6:00 1:00 -" means the transition 1892 occurs at 18:00 on the Saturday before the last Sunday in April. 1893 This behavior was documented in 2018a but the code did not 1894 entirely match the documentation. 1895 1896 localtime.c no longer requires at least one time type in TZif 1897 files that lack transitions or have a POSIX-style TZ string. This 1898 future-proofs the code against possible future extensions to the 1899 format that would allow TZif files with POSIX-style TZ strings and 1900 without transitions or time types. 1901 1902 A read-access subscript error in localtime.c has been fixed. 1903 It could occur only in TZif files with timecnt == 0, something that 1904 does not happen in practice now but could happen in future versions. 1905 1906 localtime.c no longer ignores TZif POSIX-style TZ strings that 1907 specify only standard time. Instead, these TZ strings now 1908 override the default time type for timestamps after the last 1909 transition (or for all timestamps if there are no transitions), 1910 just as DST strings specifying DST have always done. 1911 1912 leapseconds.awk now outputs "#updated" and "#expires" comments, 1913 and supports leap seconds at the ends of months other than June 1914 and December. (Inspired by suggestions from Chris Woodbury.) 1915 1916 Changes to documentation 1917 1918 New restrictions: A Rule name must start with a character that 1919 is neither an ASCII digit nor "-" nor "+", and an unquoted name 1920 should not use characters in the set "!$%&'()*,/:;<=>?@[\]^`{|}~". 1921 The latter restriction makes room for future extensions (a 1922 possibility noted by Tom Lane). 1923 1924 tzfile.5 now documents what time types apply before the first and 1925 after the last transition, if any. 1926 1927 Documentation now uses the spelling "timezone" for a TZ setting 1928 that determines timestamp history, and "time zone" for a 1929 geographic region currently sharing the same standard time. 1930 1931 The name "TZif" is now used for the tz binary data format. 1932 1933 tz-link.htm now mentions the A0 TimeZone Migration utilities. 1934 (Thanks to Aldrin Martoq for the link.) 1935 1936 Changes to build procedure 1937 1938 New 'make' target 'rearguard_tarballs' to build the rearguard 1939 tarball only. This is a convenience on platforms that lack lzip 1940 if you want to build the rearguard tarball. (Problem reported by 1941 Deborah Goldsmith.) 1942 1943 tzdata.zi is now more stable from release to release. (Problem 1944 noted by Tom Lane.) It is also a bit shorter. 1945 1946 tzdata.zi now can contain comment lines documenting configuration 1947 information, such as which data format was selected, which input 1948 files were used, and how leap seconds are treated. (Problems 1949 noted by Lester Caine and Brian Inglis.) If the Makefile defaults 1950 are used these comment lines are absent, for backward 1951 compatibility. A redistributor intending to alter its copy of the 1952 files should also append "-LABEL" to the 'version' file's first 1953 line, where "LABEL" identifies the redistributor's change. 1954 1955 1956 Release 2018e - 2018-05-01 23:42:51 -0700 1957 1958 Briefly: 1959 1960 North Korea switches back to +09 on 2018-05-05. 1961 The main format uses negative DST again, for Ireland etc. 1962 'make tarballs' now also builds a rearguard tarball. 1963 New 's' and 'd' suffixes in SAVE columns of Rule and Zone lines. 1964 1965 Changes to past and future timestamps 1966 1967 North Korea switches back from +0830 to +09 on 2018-05-05. 1968 (Thanks to Kang Seonghoon, Arthur David Olson, Seo Sanghyeon, 1969 and Tim Parenti.) 1970 1971 Bring back the negative-DST changes of 2018a, except be more 1972 compatible with data parsers that do not support negative DST. 1973 Also, this now affects historical timestamps in Namibia and the 1974 former Czechoslovakia, not just Ireland. The main format now uses 1975 negative DST to model timestamps in Europe/Dublin (from 1971 on), 1976 Europe/Prague (1946/7), and Africa/Windhoek (1994/2017). This 1977 does not affect UT offsets, only time zone abbreviations and the 1978 tm_isdst flag. Also, this does not affect rearguard or vanguard 1979 formats; effectively the main format now uses vanguard instead of 1980 rearguard format. Data parsers that do not support negative DST 1981 can still use data from the rearguard tarball described below. 1982 1983 Changes to build procedure 1984 1985 The command 'make tarballs' now also builds the tarball 1986 tzdataVERSION-rearguard.tar.gz, which is like tzdataVERSION.tar.gz 1987 except that it uses rearguard format intended for trailing-edge 1988 data parsers. 1989 1990 Changes to data format and to code 1991 1992 The SAVE column of Rule and Zone lines can now have an 's' or 'd' 1993 suffix, which specifies whether the adjusted time is standard time 1994 or daylight saving time. If no suffix is given, daylight saving 1995 time is used if and only if the SAVE column is nonzero; this is 1996 the longstanding behavior. Although this new feature is not used 1997 in tzdata, it could be used to specify the legal time in Namibia 1998 1994-2017, as opposed to the popular time (see below). 1999 2000 Changes to past timestamps 2001 2002 From 1994 through 2017 Namibia observed DST in winter, not summer. 2003 That is, it used negative DST, as Ireland still does. This change 2004 does not affect UTC offsets; it affects only the tm_isdst flag and 2005 the abbreviation used during summer, which is now CAT, not WAST. 2006 Although (as noted by Michael Deckers) summer and winter time were 2007 both simply called "standard time" in Namibian law, in common 2008 practice winter time was considered to be DST (as noted by Stephen 2009 Colebourne). The full effect of this change is only in vanguard 2010 and main format; in rearguard format, the tm_isdst flag is still 2011 zero in winter and nonzero in summer. 2012 2013 In 1946/7 Czechoslovakia also observed negative DST in winter. 2014 The full effect of this change is only in vanguard and main 2015 formats; in rearguard format, it is modeled as plain GMT without 2016 daylight saving. Also, the dates of some 1944/5 DST transitions 2017 in Czechoslovakia have been changed. 2018 2019 2020 Release 2018d - 2018-03-22 07:05:46 -0700 2021 2022 Briefly: 2023 2024 Palestine starts DST a week earlier in 2018. 2025 Add support for vanguard and rearguard data consumers. 2026 Add subsecond precision to source data format, though not to data. 2027 2028 Changes to future timestamps 2029 2030 In 2018, Palestine starts DST on March 24, not March 31. 2031 Adjust future predictions accordingly. (Thanks to Sharef Mustafa.) 2032 2033 Changes to past and future timestamps 2034 2035 Casey Station in Antarctica changed from +11 to +08 on 2018-03-11 2036 at 04:00. (Thanks to Steffen Thorsen.) 2037 2038 Changes to past timestamps 2039 2040 Historical transitions for Uruguay, represented by 2041 America/Montevideo, have been updated per official legal documents, 2042 replacing previous data mainly originating from the inventions of 2043 Shanks & Pottenger. This has resulted in adjustments ranging from 2044 30 to 90 minutes in either direction over at least two dozen 2045 distinct periods ranging from one day to several years in length. 2046 A mere handful of pre-1991 transitions are unaffected; data since 2047 then has come from more reliable contemporaneous reporting. These 2048 changes affect various timestamps in 1920-1923, 1936, 1939, 2049 1942-1943, 1959, 1966-1970, 1972, 1974-1980, and 1988-1990. 2050 Additionally, Uruguay's pre-standard-time UT offset has been 2051 adjusted westward by 7 seconds, from UT-03:44:44 to UT-03:44:51, to 2052 match the location of the Observatory of the National Meteorological 2053 Institute in Montevideo. 2054 (Thanks to Jeremie Bonjour, Tim Parenti, and Michael Deckers.) 2055 2056 East Kiribati skipped New Year's Eve 1994, not New Year's Day 1995. 2057 (Thanks to Kerry Shetline.) 2058 2059 Fix the 1912-01-01 transition for Portugal and its colonies. 2060 This transition was at 00:00 according to the new UT offset, not 2061 according to the old one. Also assume that Cape Verde switched on 2062 the same date as the rest, not in 1907. This affects 2063 Africa/Bissau, Africa/Sao_Tome, Asia/Macau, Atlantic/Azores, 2064 Atlantic/Cape_Verde, Atlantic/Madeira, and Europe/Lisbon. 2065 (Thanks to Michael Deckers.) 2066 2067 Fix an off-by-1 error for pre-1913 timestamps in Jamaica and in 2068 Turks & Caicos. 2069 2070 Changes to past time zone abbreviations 2071 2072 MMT took effect in Uruguay from 1908-06-10, not 1898-06-28. There 2073 is no clock change associated with the transition. 2074 2075 Changes to build procedure 2076 2077 The new DATAFORM macro in the Makefile lets the installer choose 2078 among three source data formats. The idea is to lessen downstream 2079 disruption when data formats are improved. 2080 2081 * DATAFORM=vanguard installs from the latest, bleeding-edge 2082 format. DATAFORM=main (the default) installs from the format 2083 used in the 'africa' etc. files. DATAFORM=rearguard installs 2084 from a trailing-edge format. Eventually, elements of today's 2085 vanguard format should move to the main format, and similarly 2086 the main format's features should eventually move to the 2087 rearguard format. 2088 2089 * In the current version, the main and rearguard formats are 2090 identical and match that of 2018c, so this change does not 2091 affect default behavior. The vanguard format currently contains 2092 one feature not in the main format: negative SAVE values. This 2093 improves support for Ireland, which uses Irish Standard Time 2094 (IST, UTC+01) in summer and GMT (UTC) in winter. tzcode has 2095 supported negative SAVE values for decades, and this feature 2096 should move to the main format soon. However, it will not move 2097 to the rearguard format for quite some time because some 2098 downstream parsers do not support it. 2099 2100 * The build procedure constructs three files vanguard.zi, main.zi, 2101 and rearguard.zi, one for each format. Although the files 2102 represent essentially the same data, they may have minor 2103 discrepancies that users are not likely to notice. The files 2104 are intended for downstream data consumers and are not 2105 installed. Zoneinfo parsers that do not support negative SAVE values 2106 should start using rearguard.zi, so that they will be unaffected 2107 when the negative-DST feature moves from vanguard to main. 2108 Bleeding-edge Zoneinfo parsers that support the new features 2109 already can use vanguard.zi; in this respect, current tzcode is 2110 bleeding-edge. 2111 2112 The Makefile should now be safe for parallelized builds, and 'make 2113 -j to2050new.tzs' is now much faster on a multiprocessor host 2114 with GNU Make. 2115 2116 When built with -DSUPPRESS_TZDIR, the tzcode library no longer 2117 prepends TZDIR/ to file names that do not begin with '/'. This is 2118 not recommended for general use, due to its security implications. 2119 (From a suggestion by Manuela Friedrich.) 2120 2121 Changes to code 2122 2123 zic now accepts subsecond precision in expressions like 2124 00:19:32.13, which is approximately the legal time of the 2125 Netherlands from 1835 to 1937. However, because it is 2126 questionable whether the few recorded uses of non-integer offsets 2127 had subsecond precision in practice, there are no plans for tzdata 2128 to use this feature. (Thanks to Steve Allen for pointing out 2129 the limitations of historical data in this area.) 2130 2131 The code is a bit more portable to MS-Windows. Installers can 2132 compile with -DRESERVE_STD_EXT_IDS on MS-Windows platforms that 2133 reserve identifiers like 'localtime'. (Thanks to Manuela 2134 Friedrich.) 2135 2136 Changes to documentation and commentary 2137 2138 theory.html now outlines tzdb's extensions to POSIX's model for 2139 civil time, and has a section "POSIX features no longer needed" 2140 that lists POSIX API components that are now vestigial. 2141 (From suggestions by Steve Summit.) It also better distinguishes 2142 time zones from tz regions. (From a suggestion by Guy Harris.) 2143 2144 Commentary is now more consistent about using the phrase "daylight 2145 saving time", to match the C name tm_isdst. Daylight saving time 2146 need not occur in summer, and need not have a positive offset from 2147 standard time. 2148 2149 Commentary about historical transitions in Uruguay has been expanded 2150 with links to many relevant legal documents. 2151 (Thanks to Tim Parenti.) 2152 2153 Commentary now uses some non-ASCII characters with Unicode value 2154 less than U+0100, as they can be useful and should work even with 2155 older editors such as XEmacs. 2156 2157 2158 Release 2018c - 2018-01-22 23:00:44 -0800 2159 2160 Briefly: 2161 Revert Irish changes that relied on negative SAVE values. 2162 2163 Changes to tm_isdst 2164 2165 Revert the 2018a change to Europe/Dublin. As before, this change 2166 does not affect UT offsets or abbreviations; it affects only 2167 whether timestamps are considered to be standard time or 2168 daylight-saving time, as expressed in the tm_isdst flag of C's 2169 struct tm type. This reversion is intended to be a temporary 2170 workaround for problems discovered with downstream uses of 2171 releases 2018a and 2018b, which implemented Irish time by using 2172 negative SAVE values in the Eire rules of the 'europe' file. 2173 Although negative SAVE values have been part of tzcode for many 2174 years and are supported by many platforms, they were not 2175 documented before 2018a and ICU and OpenJDK do not currently 2176 support them. A mechanism to export data to platforms lacking 2177 support for negative DST is planned to be developed before the 2178 change is reapplied. (Problems reported by Deborah Goldsmith and 2179 Stephen Colebourne.) 2180 2181 Changes to past timestamps 2182 2183 Japanese DST transitions (1948-1951) were Sundays at 00:00, not 2184 Saturdays or Sundays at 02:00. (Thanks to Takayuki Nikai.) 2185 2186 Changes to build procedure 2187 2188 The build procedure now works around mawk 1.3.3's lack of support 2189 for character class expressions. (Problem reported by Ohyama.) 2190 2191 2192 Release 2018b - 2018-01-17 23:24:48 -0800 2193 2194 Briefly: 2195 Fix a packaging problem in tz2018a, which was missing 'pacificnew'. 2196 2197 Changes to build procedure 2198 2199 The distribution now contains the file 'pacificnew' again. 2200 This file was inadvertently omitted in the 2018a distribution. 2201 (Problem reported by Matias Fonzo.) 2202 2203 2204 Release 2018a - 2018-01-12 22:29:21 -0800 2205 2206 Briefly: 2207 So Tom and Prncipe switched from +00 to +01. 2208 Brazil's DST will now start on November's first Sunday. 2209 Ireland's standard time is now in the summer, not the winter. 2210 Use Debian-style installation locations, instead of 4.3BSD-style. 2211 New zic option -t. 2212 2213 Changes to past and future timestamps 2214 2215 So Tom and Prncipe switched from +00 to +01 on 2018-01-01 at 2216 01:00. (Thanks to Steffen Thorsen and Michael Deckers.) 2217 2218 Changes to future timestamps 2219 2220 Starting in 2018 southern Brazil will begin DST on November's 2221 first Sunday instead of October's third Sunday. (Thanks to 2222 Steffen Thorsen.) 2223 2224 Changes to past timestamps 2225 2226 A discrepancy of 4 s in timestamps before 1931 in South Sudan has 2227 been corrected. The 'backzone' and 'zone.tab' files did not agree 2228 with the 'africa' and 'zone1970.tab' files. (Problem reported by 2229 Michael Deckers.) 2230 2231 The abbreviation invented for Bolivia Summer Time (1931-2) is now 2232 BST instead of BOST, to be more consistent with the convention 2233 used for Latvian Summer Time (1918-9) and for British Summer Time. 2234 2235 Changes to tm_isdst 2236 2237 Change Europe/Dublin so that it observes Irish Standard Time (UT 2238 +01) in summer and GMT (as negative daylight-saving) in winter, 2239 instead of observing standard time (GMT) in winter and Irish 2240 Summer Time (UT +01) in summer. This change does not affect UT 2241 offsets or abbreviations; it affects only whether timestamps are 2242 considered to be standard time or daylight-saving time, as 2243 expressed in the tm_isdst flag of C's struct tm type. 2244 (Discrepancy noted by Derick Rethans.) 2245 2246 Changes to build procedure 2247 2248 The default installation locations have been changed to mostly 2249 match Debian circa 2017, instead of being designed as an add-on to 2250 4.3BSD circa 1986. This affects the Makefile macros TOPDIR, 2251 TZDIR, MANDIR, and LIBDIR. New Makefile macros TZDEFAULT, USRDIR, 2252 USRSHAREDIR, BINDIR, ZDUMPDIR, and ZICDIR let installers tailor 2253 locations more precisely. (This responds to suggestions from 2254 Brian Inglis and from Steve Summit.) 2255 2256 The default installation procedure no longer creates the 2257 backward-compatibility link US/Pacific-New, which causes 2258 confusion during user setup (e.g., see Debian bug 815200). 2259 Use 'make BACKWARD="backward pacificnew"' to create the link 2260 anyway, for now. Eventually we plan to remove the link entirely. 2261 2262 tzdata.zi now contains a version-number comment. 2263 (Suggested by Tom Lane.) 2264 2265 The Makefile now quotes values like BACKWARD more carefully when 2266 passing them to the shell. (Problem reported by Zefram.) 2267 2268 Builders no longer need to specify -DHAVE_SNPRINTF on platforms 2269 that have snprintf and use pre-C99 compilers. (Problem reported 2270 by Jon Skeet.) 2271 2272 Changes to code 2273 2274 zic has a new option -t FILE that specifies the location of the 2275 file that determines local time when TZ is unset. The default for 2276 this location can be configured via the new TZDEFAULT makefile 2277 macro, which defaults to /etc/localtime. 2278 2279 Diagnostics and commentary now distinguish UT from UTC more 2280 carefully; see theory.html for more information about UT vs UTC. 2281 2282 zic has been ported to GCC 8's -Wstringop-truncation option. 2283 (Problem reported by Martin Sebor.) 2284 2285 Changes to documentation and commentary 2286 2287 The zic man page now documents the longstanding behavior that 2288 times and years can be out of the usual range, with negative times 2289 counting backwards from midnight and with year 0 preceding year 1. 2290 (Problem reported by Michael Deckers.) 2291 2292 The theory.html file now mentions the POSIX limit of six chars 2293 per abbreviation, and lists alphabetic abbreviations used. 2294 2295 The files tz-art.htm and tz-link.htm have been renamed to 2296 tz-art.html and tz-link.html, respectively, for consistency with 2297 other file names and to simplify web server configuration. 2298 2299 2300 Release 2017c - 2017-10-20 14:49:34 -0700 2301 2302 Briefly: 2303 Northern Cyprus switches from +03 to +02/+03 on 2017-10-29. 2304 Fiji ends DST 2018-01-14, not 2018-01-21. 2305 Namibia switches from +01/+02 to +02 on 2018-04-01. 2306 Sudan switches from +03 to +02 on 2017-11-01. 2307 Tonga likely switches from +13/+14 to +13 on 2017-11-05. 2308 Turks & Caicos switches from -04 to -05/-04 on 2018-11-04. 2309 A new file tzdata.zi now holds a small text copy of all data. 2310 The zic input format has been regularized slightly. 2311 2312 Changes to future timestamps 2313 2314 Northern Cyprus has decided to resume EU rules starting 2315 2017-10-29, thus reinstituting winter time. 2316 2317 Fiji ends DST 2018-01-14 instead of the 2018-01-21 previously 2318 predicted. (Thanks to Dominic Fok.) Adjust future predictions 2319 accordingly. 2320 2321 Namibia will switch from +01 with DST to +02 all year on 2322 2017-09-03 at 02:00. This affects UT offsets starting 2018-04-01 2323 at 02:00. (Thanks to Steffen Thorsen.) 2324 2325 Sudan will switch from +03 to +02 on 2017-11-01. (Thanks to Ahmed 2326 Atyya and Yahia Abdalla.) South Sudan is not switching, so 2327 Africa/Juba is no longer a link to Africa/Khartoum. 2328 2329 Tonga has likely ended its experiment with DST, and will not 2330 adjust its clocks on 2017-11-05. Although Tonga has not announced 2331 whether it will continue to observe DST, the IATA is assuming that 2332 it will not. (Thanks to David Wade.) 2333 2334 Turks & Caicos will switch from -04 all year to -05 with US DST on 2335 2018-03-11 at 03:00. This affects UT offsets starting 2018-11-04 2336 at 02:00. (Thanks to Steffen Thorsen.) 2337 2338 Changes to past timestamps 2339 2340 Namibia switched from +02 to +01 on 1994-03-21, not 1994-04-03. 2341 (Thanks to Arthur David Olson.) 2342 2343 Detroit did not observe DST in 1967. 2344 2345 Use railway time for Asia/Kolkata before 1941, by switching to 2346 Madras local time (UT +052110) in 1870, then to IST (UT +0530) in 2347 1906. Also, treat 1941-2's +0630 as DST, like 1942-5. 2348 2349 Europe/Dublin's 1946 and 1947 fallback transitions occurred at 2350 02:00 standard time, not 02:00 DST. (Thanks to Michael Deckers.) 2351 2352 Pacific/Apia and Pacific/Pago_Pago switched from Antipodean to 2353 American time in 1892, not 1879. (Thanks to Michael Deckers.) 2354 2355 Adjust the 1867 transition in Alaska to better reflect the 2356 historical record, by changing it to occur on 1867-10-18 at 15:30 2357 Sitka time rather than at the start of 1867-10-17 local time. 2358 Although strictly speaking this is accurate only for Sitka, 2359 the rest of Alaska's blanks need to be filled in somehow. 2360 2361 Fix off-by-one errors in UT offsets for Adak and Nome before 1867. 2362 (Thanks to Michael Deckers.) 2363 2364 Add 7 s to the UT offset in Asia/Yangon before 1920. 2365 2366 Changes to zone names 2367 2368 Remove Canada/East-Saskatchewan from the 'backward' file, as it 2369 exceeded the 14-character limit and was an unused misnomer anyway. 2370 2371 Changes to build procedure 2372 2373 To support applications that prefer to read time zone data in text 2374 form, two zic input files tzdata.zi and leapseconds are now 2375 installed by default. The commands 'zic tzdata.zi' and 'zic -L 2376 leapseconds tzdata.zi' can reproduce the tzdata binary files 2377 without and with leap seconds, respectively. To prevent these two 2378 new files from being installed, use 'make TZDATA_TEXT=', and to 2379 suppress leap seconds from the tzdata text installation, use 'make 2380 TZDATA_TEXT=tzdata.zi'. 2381 2382 'make BACKWARD=' now suppresses backward-compatibility names 2383 like 'US/Pacific' that are defined in the 'backward' and 2384 'pacificnew' files. 2385 2386 'make check' now works on systems that lack a UTF-8 locale, 2387 or that lack the nsgmls program. Set UTF8_LOCALE to configure 2388 the name of a UTF-8 locale, if you have one. 2389 2390 Y2K runtime checks are no longer enabled by default. Add 2391 -DDEPRECATE_TWO_DIGIT_YEARS to CFLAGS to enable them, instead of 2392 adding -DNO_RUN_TIME_WARNINGS_ABOUT_YEAR_2000_PROBLEMS_THANK_YOU 2393 to disable them. (New name suggested by Brian Inglis.) 2394 2395 The build procedure for zdump now works on AIX 7.1. 2396 (Problem reported by Kees Dekker.) 2397 2398 Changes to code 2399 2400 zic and the reference runtime now reject multiple leap seconds 2401 within 28 days of each other, or leap seconds before the Epoch. 2402 As a result, support for double leap seconds, which was 2403 obsolescent and undocumented, has been removed. Double leap 2404 seconds were an error in the C89 standard; they have never existed 2405 in civil timekeeping. (Thanks to Robert Elz and Bradley White for 2406 noticing glitches in the code that uncovered this problem.) 2407 2408 zic now warns about use of the obsolescent and undocumented -y 2409 option, and about use of the obsolescent TYPE field of Rule lines. 2410 2411 zic now allows unambiguous abbreviations like "Sa" and "Su" for 2412 weekdays; formerly it rejected them due to a bug. Conversely, zic 2413 no longer considers non-prefixes to be abbreviations; for example, 2414 it no longer accepts "lF" as an abbreviation for "lastFriday". 2415 Also, zic warns about the undocumented usage with a "last-" 2416 prefix, e.g., "last-Fri". 2417 2418 Similarly, zic now accepts the unambiguous abbreviation "L" for 2419 "Link" in ordinary context and for "Leap" in leap-second context. 2420 Conversely, zic no longer accepts non-prefixes such as "La" as 2421 abbreviations for words like "Leap". 2422 2423 zic no longer accepts leap second lines in ordinary input, or 2424 ordinary lines in leap second input. Formerly, zic sometimes 2425 warned about this undocumented usage and handled it incorrectly. 2426 2427 The new macro HAVE_TZNAME governs whether the tzname external 2428 variable is exported, instead of USG_COMPAT. USG_COMPAT now 2429 governs only the external variables "timezone" and "daylight". 2430 This change is needed because the three variables are not in the 2431 same category: although POSIX requires tzname, it specifies the 2432 other two variables as optional. Also, USG_COMPAT is now 1 or 0: 2433 if not defined, the code attempts to guess it from other macros. 2434 2435 localtime.c and difftime.c no longer require stdio.h, and .c files 2436 other than zic.c no longer require sys/wait.h. 2437 2438 zdump.c no longer assumes snprintf. (Reported by Jonathan Leffler.) 2439 2440 Calculation of time_t extrema works around a bug in GCC 4.8.4 2441 (Reported by Stan Shebs and Joseph Myers.) 2442 2443 zic.c no longer mistranslates formats of line numbers in non-English 2444 locales. (Problem reported by Benno Schulenberg.) 2445 2446 Several minor changes have been made to the code to make it a 2447 bit easier to port to MS-Windows and Solaris. (Thanks to Kees 2448 Dekker for reporting the problems.) 2449 2450 Changes to documentation and commentary 2451 2452 The two new files 'theory.html' and 'calendars' contain the 2453 contents of the removed file 'Theory'. The goal is to document 2454 tzdb theory more accessibly. 2455 2456 The zic man page now documents abbreviation rules. 2457 2458 tz-link.htm now covers how to apply tzdata changes to clients. 2459 (Thanks to Jorge Fbregas for the AIX link.) It also mentions MySQL. 2460 2461 The leap-seconds.list URL has been updated to something that is 2462 more reliable for tzdb. (Thanks to Tim Parenti and Brian Inglis.) 2463 2464 Release 2017b - 2017-03-17 07:30:38 -0700 2465 2466 Briefly: Haiti has resumed DST. 2467 2468 Changes to past and future timestamps 2469 2470 Haiti resumed observance of DST in 2017. (Thanks to Steffen Thorsen.) 2471 2472 Changes to past timestamps 2473 2474 Liberia changed from -004430 to +00 on 1972-01-07, not 1972-05-01. 2475 2476 Use "MMT" to abbreviate Liberia's time zone before 1972, as "-004430" 2477 is one byte over the POSIX limit. (Problem reported by Derick Rethans.) 2478 2479 Changes to code 2480 2481 The reference localtime implementation now falls back on the 2482 current US daylight-saving transition rules rather than the 2483 1987-2006 rules. This fallback occurs only when (1) the TZ 2484 environment variable has a value like "AST4ADT" that asks 2485 for daylight saving time but does not specify the rules, (2) there 2486 is no file by that name, and (3) the TZDEFRULES file cannot be 2487 loaded. (Thanks to Tom Lane.) 2488 2489 2490 Release 2017a - 2017-02-28 00:05:36 -0800 2491 2492 Briefly: Southern Chile moves from -04/-03 to -03, and Mongolia 2493 discontinues DST. 2494 2495 Changes to future timestamps 2496 2497 Mongolia no longer observes DST. (Thanks to Ganbold Tsagaankhuu.) 2498 2499 Chile's Region of Magallanes moves from -04/-03 to -03 year-round. 2500 Its clocks diverge from America/Santiago starting 2017-05-13 at 2501 23:00, hiving off a new zone America/Punta_Arenas. Although the 2502 Chilean government says this change expires in May 2019, for now 2503 assume it's permanent. (Thanks to Juan Correa and Deborah 2504 Goldsmith.) This also affects Antarctica/Palmer. 2505 2506 Changes to past timestamps 2507 2508 Fix many entries for historical timestamps for Europe/Madrid 2509 before 1979, to agree with tables compiled by Pere Planesas of the 2510 National Astronomical Observatory of Spain. As a side effect, 2511 this changes some timestamps for Africa/Ceuta before 1929, which 2512 are probably guesswork anyway. (Thanks to Steve Allen and 2513 Pierpaolo Bernardi for the heads-ups, and to Michael Deckers for 2514 correcting the 1901 transition.) 2515 2516 Ecuador observed DST from 1992-11-28 to 1993-02-05. 2517 (Thanks to Alois Treindl.) 2518 2519 Asia/Atyrau and Asia/Oral were at +03 (not +04) before 1930-06-21. 2520 (Thanks to Stepan Golosunov.) 2521 2522 Changes to past and future time zone abbreviations 2523 2524 Switch to numeric time zone abbreviations for South America, as 2525 part of the ongoing project of removing invented abbreviations. 2526 This avoids the need to invent an abbreviation for the new Chilean 2527 new zone. Similarly, switch from invented to numeric time zone 2528 abbreviations for Afghanistan, American Samoa, the Azores, 2529 Bangladesh, Bhutan, the British Indian Ocean Territory, Brunei, 2530 Cape Verde, Chatham Is, Christmas I, Cocos (Keeling) Is, Cook Is, 2531 Dubai, East Timor, Eucla, Fiji, French Polynesia, Greenland, 2532 Indochina, Iran, Iraq, Kiribati, Lord Howe, Macquarie, Malaysia, 2533 the Maldives, Marshall Is, Mauritius, Micronesia, Mongolia, 2534 Myanmar, Nauru, Nepal, New Caledonia, Niue, Norfolk I, Palau, 2535 Papua New Guinea, the Philippines, Pitcairn, Qatar, Runion, St 2536 Pierre & Miquelon, Samoa, Saudi Arabia, Seychelles, Singapore, 2537 Solomon Is, Tokelau, Tuvalu, Wake, Vanuatu, Wallis & Futuna, and 2538 Xinjiang; for 20-minute daylight saving time in Ghana before 1943; 2539 for half-hour daylight saving time in Belize before 1944 and in 2540 the Dominican Republic before 1975; and for Canary Islands before 2541 1946, for Guinea-Bissau before 1975, for Iceland before 1969, for 2542 Indian Summer Time before 1942, for Indonesia before around 1964, 2543 for Kenya before 1960, for Liberia before 1973, for Madeira before 2544 1967, for Namibia before 1943, for the Netherlands in 1937-9, for 2545 Pakistan before 1971, for Western Sahara before 1977, and for 2546 Zaporozhye in 1880-1924. 2547 2548 For Alaska time from 1900 through 1967, instead of "CAT" use the 2549 abbreviation "AST", the abbreviation commonly used at the time 2550 (Atlantic Standard Time had not been standardized yet). Use "AWT" 2551 and "APT" instead of the invented abbreviations "CAWT" and "CAPT". 2552 2553 Use "CST" and "CDT" instead of invented abbreviations for Macau 2554 before 1999 and Taiwan before 1938, and use "JST" instead of the 2555 invented abbreviation "JCST" for Japan and Korea before 1938. 2556 2557 Change to database entry category 2558 2559 Move the Pacific/Johnston link from 'australasia' to 'backward', 2560 since Johnston is now uninhabited. 2561 2562 Changes to code 2563 2564 zic no longer mishandles some transitions in January 2038 when it 2565 attempts to work around Qt bug 53071. This fixes a bug affecting 2566 Pacific/Tongatapu that was introduced in zic 2016e. localtime.c 2567 now contains a workaround, useful when loading a file generated by 2568 a buggy zic. (Problem and localtime.c fix reported by Bradley 2569 White.) 2570 2571 zdump -i now outputs non-hour numeric time zone abbreviations 2572 without a colon, e.g., "+0530" rather than "+05:30". This agrees 2573 with zic %z and with common practice, and simplifies auditing of 2574 zdump output. 2575 2576 zdump is now buildable again with -DUSE_LTZ=0. 2577 (Problem reported by Joseph Myers.) 2578 2579 zdump.c now always includes private.h, to avoid code duplication 2580 with private.h. (Problem reported by Kees Dekker.) 2581 2582 localtime.c no longer mishandles early or late timestamps 2583 when TZ is set to a POSIX-style string that specifies DST. 2584 (Problem reported by Kees Dekker.) 2585 2586 date and strftime now cause %z to generate "-0000" instead of 2587 "+0000" when the UT offset is zero and the time zone abbreviation 2588 begins with "-". 2589 2590 Changes to documentation and commentary 2591 2592 The 'Theory' file now better documents choice of historical time 2593 zone abbreviations. (Problems reported by Michael Deckers.) 2594 2595 tz-link.htm now covers leap smearing, which is popular in clouds. 2596 2597 2598 Release 2016j - 2016-11-22 23:17:13 -0800 2599 2600 Briefly: Saratov, Russia moves from +03 to +04 on 2016-12-04. 2601 2602 Changes to future timestamps 2603 2604 Saratov, Russia switches from +03 to +04 on 2016-12-04 at 02:00. 2605 This hives off a new zone Europe/Saratov from Europe/Volgograd. 2606 (Thanks to Yuri Konotopov and Stepan Golosunov.) 2607 2608 Changes to past timestamps 2609 2610 The new zone Asia/Atyrau for Atyra Region, Kazakhstan, is like 2611 Asia/Aqtau except it switched from +05/+06 to +04/+05 in spring 2612 1999, not fall 1994. (Thanks to Stepan Golosunov.) 2613 2614 Changes to past time zone abbreviations 2615 2616 Asia/Gaza and Asia/Hebron now use "EEST", not "EET", to denote 2617 summer time before 1948. The old use of "EET" was a typo. 2618 2619 Changes to code 2620 2621 zic no longer mishandles file systems that lack hard links, fixing 2622 bugs introduced in 2016g. (Problems reported by Tom Lane.) 2623 Also, when the destination already contains symbolic links, zic 2624 should now work better on systems where the 'link' system call 2625 does not follow symbolic links. 2626 2627 Changes to documentation and commentary 2628 2629 tz-link.htm now documents the relationship between release version 2630 numbers and development-repository commit tags. (Suggested by 2631 Paul Koning.) 2632 2633 The 'Theory' file now documents UT. 2634 2635 iso3166.tab now accents "Curaao", and commentary now mentions 2636 the names "Cabo Verde" and "Czechia". (Thanks to Ji Boh.) 2637 2638 2639 Release 2016i - 2016-11-01 23:19:52 -0700 2640 2641 Briefly: Cyprus split into two time zones on 2016-10-30, and Tonga 2642 reintroduces DST on 2016-11-06. 2643 2644 Changes to future timestamps 2645 2646 Pacific/Tongatapu begins DST on 2016-11-06 at 02:00, ending on 2647 2017-01-15 at 03:00. Assume future observances in Tonga will be 2648 from the first Sunday in November through the third Sunday in 2649 January, like Fiji. (Thanks to Pulu Anau.) Switch to numeric 2650 time zone abbreviations for this zone. 2651 2652 Changes to past and future timestamps 2653 2654 Northern Cyprus is now +03 year round, causing a split in Cyprus 2655 time zones starting 2016-10-30 at 04:00. This creates a zone 2656 Asia/Famagusta. (Thanks to Even Scharning and Matt Johnson.) 2657 2658 Antarctica/Casey switched from +08 to +11 on 2016-10-22. 2659 (Thanks to Steffen Thorsen.) 2660 2661 Changes to past timestamps 2662 2663 Several corrections were made for pre-1975 timestamps in Italy. 2664 These affect Europe/Malta, Europe/Rome, Europe/San_Marino, and 2665 Europe/Vatican. 2666 2667 First, the 1893-11-01 00:00 transition in Italy used the new UT 2668 offset (+01), not the old (+00:49:56). (Thanks to Michael 2669 Deckers.) 2670 2671 Second, rules for daylight saving in Italy were changed to agree 2672 with Italy's National Institute of Metrological Research (INRiM) 2673 except for 1944, as follows (thanks to Pierpaolo Bernardi, Brian 2674 Inglis, and Michael Deckers): 2675 2676 The 1916-06-03 transition was at 24:00, not 00:00. 2677 2678 The 1916-10-01, 1919-10-05, and 1920-09-19 transitions were at 2679 00:00, not 01:00. 2680 2681 The 1917-09-30 and 1918-10-06 transitions were at 24:00, not 2682 01:00. 2683 2684 The 1944-09-17 transition was at 03:00, not 01:00. This 2685 particular change is taken from Italian law as INRiM's table, 2686 (which says 02:00) appears to have a typo here. Also, keep the 2687 1944-04-03 transition for Europe/Rome, as Rome was controlled by 2688 Germany then. 2689 2690 The 1967-1970 and 1972-1974 fallback transitions were at 01:00, 2691 not 00:00. 2692 2693 Changes to code 2694 2695 The code should now be buildable on AmigaOS merely by setting the 2696 appropriate Makefile variables. (From a patch by Carsten Larsen.) 2697 2698 2699 Release 2016h - 2016-10-19 23:17:57 -0700 2700 2701 Changes to future timestamps 2702 2703 Asia/Gaza and Asia/Hebron end DST on 2016-10-29 at 01:00, not 2704 2016-10-21 at 00:00. (Thanks to Sharef Mustafa.) Predict that 2705 future fall transitions will be on the last Saturday of October 2706 at 01:00, which is consistent with predicted spring transitions 2707 on the last Saturday of March. (Thanks to Tim Parenti.) 2708 2709 Changes to past timestamps 2710 2711 In Turkey, transitions in 1986-1990 were at 01:00 standard time 2712 not at 02:00, and the spring 1994 transition was on March 20, not 2713 March 27. (Thanks to Kvan Yazan.) 2714 2715 Changes to past and future time zone abbreviations 2716 2717 Asia/Colombo now uses numeric time zone abbreviations like "+0530" 2718 instead of alphabetic ones like "IST" and "LKT". Various 2719 English-language sources use "IST", "LKT" and "SLST", with no 2720 working consensus. (Usage of "SLST" mentioned by Sadika 2721 Sumanapala.) 2722 2723 Changes to code 2724 2725 zic no longer mishandles relativizing file names when creating 2726 symbolic links like /etc/localtime, when these symbolic links 2727 are outside the usual directory hierarchy. This fixes a bug 2728 introduced in 2016g. (Problem reported by Andreas Stieger.) 2729 2730 Changes to build procedure 2731 2732 New rules 'traditional_tarballs' and 'traditional_signatures' for 2733 building just the traditional-format distribution. (Requested by 2734 Deborah Goldsmith.) 2735 2736 The file 'version' is now put into the tzdata tarball too. 2737 (Requested by Howard Hinnant.) 2738 2739 Changes to documentation and commentary 2740 2741 The 'Theory' file now has a section on interface stability. 2742 (Requested by Paul Koning.) It also mentions features like 2743 tm_zone and localtime_rz that have long been supported by the 2744 reference code. 2745 2746 tz-link.htm has improved coverage of time zone boundaries suitable 2747 for geolocation. (Thanks to heads-ups from Evan Siroky and Matt 2748 Johnson.) 2749 2750 The US commentary now mentions Allen and the "day of two noons". 2751 2752 The Fiji commentary mentions the government's 2016-10-03 press 2753 release. (Thanks to Raymond Kumar.) 2754 2755 2756 Release 2016g - 2016-09-13 08:56:38 -0700 2757 2758 Changes to future timestamps 2759 2760 Turkey switched from EET/EEST (+02/+03) to permanent +03, 2761 effective 2016-09-07. (Thanks to Burak AYDIN.) Use "+03" rather 2762 than an invented abbreviation for the new time. 2763 2764 New leap second 2016-12-31 23:59:60 UTC as per IERS Bulletin C 52. 2765 (Thanks to Tim Parenti.) 2766 2767 Changes to past timestamps 2768 2769 For America/Los_Angeles, spring-forward transition times have been 2770 corrected from 02:00 to 02:01 in 1948, and from 02:00 to 01:00 in 2771 1950-1966. 2772 2773 For zones using Soviet time on 1919-07-01, transitions to UT-based 2774 time were at 00:00 UT, not at 02:00 local time. The affected 2775 zones are Europe/Kirov, Europe/Moscow, Europe/Samara, and 2776 Europe/Ulyanovsk. (Thanks to Alexander Belopolsky.) 2777 2778 Changes to past and future time zone abbreviations 2779 2780 The Factory zone now uses the time zone abbreviation -00 instead 2781 of a long English-language string, as -00 is now the normal way to 2782 represent an undefined time zone. 2783 2784 Several zones in Antarctica and the former Soviet Union, along 2785 with zones intended for ships at sea that cannot use POSIX TZ 2786 strings, now use numeric time zone abbreviations instead of 2787 invented or obsolete alphanumeric abbreviations. The affected 2788 zones are Antarctica/Casey, Antarctica/Davis, 2789 Antarctica/DumontDUrville, Antarctica/Mawson, Antarctica/Rothera, 2790 Antarctica/Syowa, Antarctica/Troll, Antarctica/Vostok, 2791 Asia/Anadyr, Asia/Ashgabat, Asia/Baku, Asia/Bishkek, Asia/Chita, 2792 Asia/Dushanbe, Asia/Irkutsk, Asia/Kamchatka, Asia/Khandyga, 2793 Asia/Krasnoyarsk, Asia/Magadan, Asia/Omsk, Asia/Sakhalin, 2794 Asia/Samarkand, Asia/Srednekolymsk, Asia/Tashkent, Asia/Tbilisi, 2795 Asia/Ust-Nera, Asia/Vladivostok, Asia/Yakutsk, Asia/Yekaterinburg, 2796 Asia/Yerevan, Etc/GMT-14, Etc/GMT-13, Etc/GMT-12, Etc/GMT-11, 2797 Etc/GMT-10, Etc/GMT-9, Etc/GMT-8, Etc/GMT-7, Etc/GMT-6, Etc/GMT-5, 2798 Etc/GMT-4, Etc/GMT-3, Etc/GMT-2, Etc/GMT-1, Etc/GMT+1, Etc/GMT+2, 2799 Etc/GMT+3, Etc/GMT+4, Etc/GMT+5, Etc/GMT+6, Etc/GMT+7, Etc/GMT+8, 2800 Etc/GMT+9, Etc/GMT+10, Etc/GMT+11, Etc/GMT+12, Europe/Kaliningrad, 2801 Europe/Minsk, Europe/Samara, Europe/Volgograd, and 2802 Indian/Kerguelen. For Europe/Moscow the invented abbreviation MSM 2803 was replaced by +05, whereas MSK and MSD were kept as they are not 2804 our invention and are widely used. 2805 2806 Changes to zone names 2807 2808 Rename Asia/Rangoon to Asia/Yangon, with a backward compatibility link. 2809 (Thanks to David Massoud.) 2810 2811 Changes to code 2812 2813 zic no longer generates binary files containing POSIX TZ-like 2814 strings that disagree with the local time type after the last 2815 explicit transition in the data. This fixes a bug with 2816 Africa/Casablanca and Africa/El_Aaiun in some year-2037 timestamps 2817 on the reference platform. (Thanks to Alexander Belopolsky for 2818 reporting the bug and suggesting a way forward.) 2819 2820 If the installed localtime and/or posixrules files are symbolic 2821 links, zic now keeps them symbolic links when updating them, for 2822 compatibility with platforms like OpenSUSE where other programs 2823 configure these files as symlinks. 2824 2825 zic now avoids hard linking to symbolic links, avoids some 2826 unnecessary mkdir and stat system calls, and uses shorter file 2827 names internally. 2828 2829 zdump has a new -i option to generate transitions in a 2830 smaller but still human-readable format. This option is 2831 experimental, and the output format may change in future versions. 2832 (Thanks to Jon Skeet for suggesting that an option was needed, 2833 and thanks to Tim Parenti and Chris Rovick for further comments.) 2834 2835 Changes to build procedure 2836 2837 An experimental distribution format is available, in addition 2838 to the traditional format which will continue to be distributed. 2839 The new format is a tarball tzdb-VERSION.tar.lz with signature 2840 file tzdb-VERSION.tar.lz.asc. It unpacks to a top-level directory 2841 tzdb-VERSION containing the code and data of the traditional 2842 two-tarball format, along with extra data that may be useful. 2843 (Thanks to Antonio Diaz Diaz, Oscar van Vlijmen, and many others 2844 for comments about the experimental format.) 2845 2846 The release version number is now more accurate in the usual case 2847 where releases are built from a Git repository. For example, if 2848 23 commits and some working-file changes have been made since 2849 release 2016g, the version number is now something like 2850 '2016g-23-g50556e3-dirty' instead of the misleading '2016g'. 2851 Tagged releases use the same version number format as before, 2852 e.g., '2016g'. To support the more accurate version number, its 2853 specification has moved from a line in the Makefile to a new 2854 source file 'version'. 2855 2856 The experimental distribution contains a file to2050.tzs that 2857 contains what should be the output of 'zdump -i -c 2050' on 2858 primary zones. If this file is available, 'make check' now checks 2859 that zdump generates this output. 2860 2861 'make check_web' now works on Fedora-like distributions. 2862 2863 Changes to documentation and commentary 2864 2865 tzfile.5 now documents the new restriction on POSIX TZ-like 2866 strings that is now implemented by zic. 2867 2868 Comments now cite URLs for some 1917-1921 Russian DST decrees. 2869 (Thanks to Alexander Belopolsky.) 2870 2871 tz-link.htm mentions JuliaTime (thanks to Curtis Vogt) and Time4J 2872 (thanks to Meno Hochschild) and ThreeTen-Extra, and its 2873 description of Java 8 has been brought up to date (thanks to 2874 Stephen Colebourne). Its description of local time on Mars has 2875 been updated to match current practice, and URLs have been updated 2876 and some obsolete ones removed. 2877 2878 2879 Release 2016f - 2016-07-05 16:26:51 +0200 2880 2881 Changes affecting future timestamps 2882 2883 The Egyptian government changed its mind on short notice, and 2884 Africa/Cairo will not introduce DST starting 2016-07-07 after all. 2885 (Thanks to Mina Samuel.) 2886 2887 Asia/Novosibirsk switches from +06 to +07 on 2016-07-24 at 02:00. 2888 (Thanks to Stepan Golosunov.) 2889 2890 Changes to past and future timestamps 2891 2892 Asia/Novokuznetsk and Asia/Novosibirsk now use numeric time zone 2893 abbreviations instead of invented ones. 2894 2895 Changes affecting past timestamps 2896 2897 Europe/Minsk's 1992-03-29 spring-forward transition was at 02:00 not 00:00. 2898 (Thanks to Stepan Golosunov.) 2899 2900 2901 Release 2016e - 2016-06-14 08:46:16 -0700 2902 2903 Changes affecting future timestamps 2904 2905 Africa/Cairo observes DST in 2016 from July 7 to the end of October. 2906 Guess October 27 and 24:00 transitions. (Thanks to Steffen Thorsen.) 2907 For future years, guess April's last Thursday to October's last 2908 Thursday except for Ramadan. 2909 2910 Changes affecting past timestamps 2911 2912 Locations while uninhabited now use '-00', not 'zzz', as a 2913 placeholder time zone abbreviation. This is inspired by Internet 2914 RFC 3339 and is more consistent with numeric time zone 2915 abbreviations already used elsewhere. The change affects several 2916 arctic and antarctic locations, e.g., America/Cambridge_Bay before 2917 1920 and Antarctica/Troll before 2005. 2918 2919 Asia/Baku's 1992-09-27 transition from +04 (DST) to +04 (non-DST) was 2920 at 03:00, not 23:00 the previous day. (Thanks to Michael Deckers.) 2921 2922 Changes to code 2923 2924 zic now outputs a dummy transition at time 2**31 - 1 in zones 2925 whose POSIX-style TZ strings contain a '<'. This mostly works 2926 around Qt bug 53071 <https://bugreports.qt.io/browse/QTBUG-53071>. 2927 (Thanks to Zhanibek Adilbekov for reporting the Qt bug.) 2928 2929 Changes affecting documentation and commentary 2930 2931 tz-link.htm says why governments should give plenty of notice for 2932 time zone or DST changes, and refers to Matt Johnson's blog post. 2933 2934 tz-link.htm mentions Tzdata for Elixir. (Thanks to Matt Johnson.) 2935 2936 2937 Release 2016d - 2016-04-17 22:50:29 -0700 2938 2939 Changes affecting future timestamps 2940 2941 America/Caracas switches from -0430 to -04 on 2016-05-01 at 02:30. 2942 (Thanks to Alexander Krivenyshev for the heads-up.) 2943 2944 Asia/Magadan switches from +10 to +11 on 2016-04-24 at 02:00. 2945 (Thanks to Alexander Krivenyshev and Matt Johnson.) 2946 2947 New zone Asia/Tomsk, split off from Asia/Novosibirsk. It covers 2948 Tomsk Oblast, Russia, which switches from +06 to +07 on 2016-05-29 2949 at 02:00. (Thanks to Stepan Golosunov.) 2950 2951 Changes affecting past timestamps 2952 2953 New zone Europe/Kirov, split off from Europe/Volgograd. It covers 2954 Kirov Oblast, Russia, which switched from +04/+05 to +03/+04 on 2955 1989-03-26 at 02:00, roughly a year after Europe/Volgograd made 2956 the same change. (Thanks to Stepan Golosunov.) 2957 2958 Russia and nearby locations had daylight-saving transitions on 2959 1992-03-29 at 02:00 and 1992-09-27 at 03:00, instead of on 2960 1992-03-28 at 23:00 and 1992-09-26 at 23:00. (Thanks to Stepan 2961 Golosunov.) 2962 2963 Many corrections to historical time in Kazakhstan from 1991 2964 through 2005. (Thanks to Stepan Golosunov.) Replace Kazakhstan's 2965 invented time zone abbreviations with numeric abbreviations. 2966 2967 Changes to commentary 2968 2969 Mention Internet RFCs 7808 (TZDIST) and 7809 (CalDAV time zone references). 2970 2971 2972 Release 2016c - 2016-03-23 00:51:27 -0700 2973 2974 Changes affecting future timestamps 2975 2976 Azerbaijan no longer observes DST. (Thanks to Steffen Thorsen.) 2977 2978 Chile reverts from permanent to seasonal DST. (Thanks to Juan 2979 Correa for the heads-up, and to Tim Parenti for corrections.) 2980 Guess that future transitions are August's and May's second 2981 Saturdays at 24:00 mainland time. Also, call the period from 2982 2014-09-07 through 2016-05-14 daylight saving time instead of 2983 standard time, as that seems more appropriate now. 2984 2985 Changes affecting past timestamps 2986 2987 Europe/Kaliningrad and Europe/Vilnius changed from +03/+04 to 2988 +02/+03 on 1989-03-26, not 1991-03-31. Europe/Volgograd changed 2989 from +04/+05 to +03/+04 on 1988-03-27, not 1989-03-26. 2990 (Thanks to Stepan Golosunov.) 2991 2992 Changes to commentary 2993 2994 Several updates and URLs for historical and proposed Russian changes. 2995 (Thanks to Stepan Golosunov, Matt Johnson, and Alexander Krivenyshev.) 2996 2997 2998 Release 2016b - 2016-03-12 17:30:14 -0800 2999 3000 Compatibility note 3001 3002 Starting with release 2016b, some data entries cause zic implementations 3003 derived from tz releases 2005j through 2015e to issue warnings like 3004 "time zone abbreviation differs from POSIX standard (+03)". 3005 These warnings should not otherwise affect zic's output and can safely be 3006 ignored on today's platforms, as the warnings refer to a restriction in 3007 POSIX.1-1988 that was removed in POSIX.1-2001. One way to suppress the 3008 warnings is to upgrade to zic derived from tz releases 2015f and later. 3009 3010 Changes affecting future timestamps 3011 3012 New zones Europe/Astrakhan and Europe/Ulyanovsk for Astrakhan and 3013 Ulyanovsk Oblasts, Russia, both of which will switch from +03 to +04 on 3014 2016-03-27 at 02:00 local time. They need distinct zones since their 3015 post-1970 histories disagree. New zone Asia/Barnaul for Altai Krai and 3016 Altai Republic, Russia, which will switch from +06 to +07 on the same date 3017 and local time. The Astrakhan change is already official; the others have 3018 passed the first reading in the State Duma and are extremely likely. 3019 Also, Asia/Sakhalin moves from +10 to +11 on 2016-03-27 at 02:00. 3020 (Thanks to Alexander Krivenyshev for the heads-up, and to Matt Johnson 3021 and Stepan Golosunov for followup.) 3022 3023 As a trial of a new system that needs less information to be made up, 3024 the new zones use numeric time zone abbreviations like "+04" 3025 instead of invented abbreviations like "ASTT". 3026 3027 Haiti will not observe DST in 2016. (Thanks to Jean Antoine via 3028 Steffen Thorsen.) 3029 3030 Palestine's spring-forward transition on 2016-03-26 is at 01:00, not 00:00. 3031 (Thanks to Hannah Kreitem.) Guess future transitions will be March's last 3032 Saturday at 01:00, not March's last Friday at 24:00. 3033 3034 Changes affecting past timestamps 3035 3036 Europe/Chisinau observed DST during 1990, and switched from +04 to 3037 +03 at 1990-05-06 02:00, instead of switching from +03 to +02. 3038 (Thanks to Stepan Golosunov.) 3039 3040 1991 abbreviations in Europe/Samara should be SAMT/SAMST, not 3041 KUYT/KUYST. (Thanks to Stepan Golosunov.) 3042 3043 Changes to code 3044 3045 tzselect's diagnostics and checking, and checktab.awk's checking, 3046 have been improved. (Thanks to J William Piggott.) 3047 3048 tzcode now builds under MinGW. (Thanks to Ian Abbott and Esben Haabendal.) 3049 3050 tzselect now tests Julian-date TZ settings more accurately. 3051 (Thanks to J William Piggott.) 3052 3053 Changes to commentary 3054 3055 Comments in zone tables have been improved. (Thanks to J William Piggott.) 3056 3057 tzselect again limits its menu comments so that menus fit on a 3058 2480 alphanumeric display. 3059 3060 A new web page tz-how-to.html. (Thanks to Bill Seymour.) 3061 3062 In the Theory file, the description of possible time zone abbreviations in 3063 tzdata has been cleaned up, as the old description was unclear and 3064 inconsistent. (Thanks to Alain Mouette for reporting the problem.) 3065 3066 3067 Release 2016a - 2016-01-26 23:28:02 -0800 3068 3069 Changes affecting future timestamps 3070 3071 America/Cayman will not observe daylight saving this year after all. 3072 Revert our guess that it would. (Thanks to Matt Johnson.) 3073 3074 Asia/Chita switches from +0800 to +0900 on 2016-03-27 at 02:00. 3075 (Thanks to Alexander Krivenyshev.) 3076 3077 Asia/Tehran now has DST predictions for the year 2038 and later, 3078 to be March 21 00:00 to September 21 00:00. This is likely better 3079 than predicting no DST, albeit off by a day every now and then. 3080 3081 Changes affecting past and future timestamps 3082 3083 America/Metlakatla switched from PST all year to AKST/AKDT on 3084 2015-11-01 at 02:00. (Thanks to Steffen Thorsen.) 3085 3086 America/Santa_Isabel has been removed, and replaced with a 3087 backward compatibility link to America/Tijuana. Its contents were 3088 apparently based on a misreading of Mexican legislation. 3089 3090 Changes affecting past timestamps 3091 3092 Asia/Karachi's two transition times in 2002 were off by a minute. 3093 (Thanks to Matt Johnson.) 3094 3095 Changes affecting build procedure 3096 3097 An installer can now combine leap seconds with use of the backzone file, 3098 e.g., with 'make PACKRATDATA=backzone REDO=posix_right zones'. 3099 The old 'make posix_packrat' rule is now marked as obsolescent. 3100 (Thanks to Ian Abbott for an initial implementation.) 3101 3102 Changes affecting documentation and commentary 3103 3104 A new file LICENSE makes it easier to see that the code and data 3105 are mostly public-domain. (Thanks to James Knight.) The three 3106 non-public-domain files now use the current (3-clause) BSD license 3107 instead of older versions of that license. 3108 3109 tz-link.htm mentions the BDE library (thanks to Andrew Paprocki), 3110 CCTZ (thanks to Tim Parenti), TimeJones.com, and has a new section 3111 on editing tz source files (with a mention of Sublime zoneinfo, 3112 thanks to Gilmore Davidson). 3113 3114 The Theory and asia files now mention the 2015 book "The Global 3115 Transformation of Time, 1870-1950", and cite a couple of reviews. 3116 3117 The America/Chicago entry now documents the informal use of US 3118 central time in Fort Pierre, South Dakota. (Thanks to Rick 3119 McDermid, Matt Johnson, and Steve Jones.) 3120 3121 3122 Release 2015g - 2015-10-01 00:39:51 -0700 3123 3124 Changes affecting future timestamps 3125 3126 Turkey's 2015 fall-back transition is scheduled for Nov. 8, not Oct. 25. 3127 (Thanks to Fatih.) 3128 3129 Norfolk moves from +1130 to +1100 on 2015-10-04 at 02:00 local time. 3130 (Thanks to Alexander Krivenyshev.) 3131 3132 Fiji's 2016 fall-back transition is scheduled for January 17, not 24. 3133 (Thanks to Ken Rylander.) 3134 3135 Fort Nelson, British Columbia will not fall back on 2015-11-01. It has 3136 effectively been on MST (-0700) since it advanced its clocks on 2015-03-08. 3137 New zone America/Fort_Nelson. (Thanks to Matt Johnson.) 3138 3139 Changes affecting past timestamps 3140 3141 Norfolk observed DST from 1974-10-27 02:00 to 1975-03-02 02:00. 3142 3143 Changes affecting code 3144 3145 localtime no longer mishandles America/Anchorage after 2037. 3146 (Thanks to Bradley White for reporting the bug.) 3147 3148 On hosts with signed 32-bit time_t, localtime no longer mishandles 3149 Pacific/Fiji after 2038-01-16 14:00 UTC. 3150 3151 The localtime module allows the variables 'timezone', 'daylight', 3152 and 'altzone' to be in common storage shared with other modules, 3153 and declares them in case the system <time.h> does not. 3154 (Problems reported by Kees Dekker.) 3155 3156 On platforms with tm_zone, strftime.c now assumes it is not NULL. 3157 This simplifies the code and is consistent with zdump.c. 3158 (Problem reported by Christos Zoulas.) 3159 3160 Changes affecting documentation 3161 3162 The tzfile man page now documents that transition times denote the 3163 starts (not the ends) of the corresponding time periods. 3164 (Ambiguity reported by Bill Seymour.) 3165 3166 3167 Release 2015f - 2015-08-10 18:06:56 -0700 3168 3169 Changes affecting future timestamps 3170 3171 North Korea switches to +0830 on 2015-08-15. (Thanks to Steffen Thorsen.) 3172 The abbreviation remains "KST". (Thanks to Robert Elz.) 3173 3174 Uruguay no longer observes DST. (Thanks to Steffen Thorsen 3175 and Pablo Camargo.) 3176 3177 Changes affecting past and future timestamps 3178 3179 Moldova starts and ends DST at 00:00 UTC, not at 01:00 UTC. 3180 (Thanks to Roman Tudos.) 3181 3182 Changes affecting data format and code 3183 3184 zic's '-y YEARISTYPE' option is no longer documented. The TYPE 3185 field of a Rule line should now be '-'; the old values 'even', 3186 'odd', 'uspres', 'nonpres', 'nonuspres' were already undocumented. 3187 Although the implementation has not changed, these features do not 3188 work in the default installation, they are not used in the data, 3189 and they are now considered obsolescent. 3190 3191 zic now checks that two rules don't take effect at the same time. 3192 (Thanks to Jon Skeet and Arthur David Olson.) Constraints on 3193 simultaneity are now documented. 3194 3195 The two characters '%z' in a zone format now stand for the UT 3196 offset, e.g., '-07' for seven hours behind UT and '+0530' for 3197 five hours and thirty minutes ahead. This better supports time 3198 zone abbreviations conforming to POSIX.1-2001 and later. 3199 3200 Changes affecting installed data files 3201 3202 Comments for America/Halifax and America/Glace_Bay have been improved. 3203 (Thanks to Brian Inglis.) 3204 3205 Data entries have been simplified for Atlantic/Canary, Europe/Simferopol, 3206 Europe/Sofia, and Europe/Tallinn. This yields slightly smaller 3207 installed data files for Europe/Simferopol and Europe/Tallinn. 3208 It does not affect timestamps. (Thanks to Howard Hinnant.) 3209 3210 Changes affecting code 3211 3212 zdump and zic no longer warn about valid time zone abbreviations 3213 like '-05'. 3214 3215 Some Visual Studio 2013 warnings have been suppressed. 3216 (Thanks to Kees Dekker.) 3217 3218 'date' no longer sets the time of day and its -a, -d, -n and -t 3219 options have been removed. Long obsolescent, the implementation 3220 of these features had porting problems. Builders no longer need 3221 to configure HAVE_ADJTIME, HAVE_SETTIMEOFDAY, or HAVE_UTMPX_H. 3222 (Thanks to Kees Dekker for pointing out the problem.) 3223 3224 Changes affecting documentation 3225 3226 The Theory file mentions naming issues earlier, as these seem to be 3227 poorly publicized (thanks to Gilmore Davidson for reporting the problem). 3228 3229 tz-link.htm mentions Time Zone Database Parser (thanks to Howard Hinnant). 3230 3231 Mention that Herbert Samuel introduced the term "Summer Time". 3232 3233 3234 Release 2015e - 2015-06-13 10:56:02 -0700 3235 3236 Changes affecting future timestamps 3237 3238 Morocco will suspend DST from 2015-06-14 03:00 through 2015-07-19 02:00, 3239 not 06-13 and 07-18 as we had guessed. (Thanks to Milamber.) 3240 3241 Assume Cayman Islands will observe DST starting next year, using US rules. 3242 Although it isn't guaranteed, it is the most likely. 3243 3244 Changes affecting data format 3245 3246 The file 'iso3166.tab' now uses UTF-8, so that its entries can better 3247 spell the names of land Islands, Cte d'Ivoire, and Runion. 3248 3249 Changes affecting code 3250 3251 When displaying data, tzselect converts it to the current locale's 3252 encoding if the iconv command works. (Problem reported by random832.) 3253 3254 tzselect no longer mishandles Dominica, fixing a bug introduced 3255 in Release 2014f. (Problem reported by Owen Leibman.) 3256 3257 zic -l no longer fails when compiled with -DTZDEFAULT=\"/etc/localtime\". 3258 This fixes a bug introduced in Release 2014f. 3259 (Problem reported by Leonardo Chiquitto.) 3260 3261 3262 Release 2015d - 2015-04-24 08:09:46 -0700 3263 3264 Changes affecting future timestamps 3265 3266 Egypt will not observe DST in 2015 and will consider canceling it 3267 permanently. For now, assume no DST indefinitely. 3268 (Thanks to Ahmed Nazmy and Tim Parenti.) 3269 3270 Changes affecting past timestamps 3271 3272 America/Whitehorse switched from UT -09 to -08 on 1967-05-28, not 3273 1966-07-01. Also, Yukon's time zone history is documented better. 3274 (Thanks to Brian Inglis and Dennis Ferguson.) 3275 3276 Change affecting past and future time zone abbreviations 3277 3278 The abbreviations for Hawaii-Aleutian standard and daylight times 3279 have been changed from HAST/HADT to HST/HDT, as per US Government 3280 Printing Office style. This affects only America/Adak since 1983, 3281 as America/Honolulu was already using the new style. 3282 3283 Changes affecting code 3284 3285 zic has some minor performance improvements. 3286 3287 3288 Release 2015c - 2015-04-11 08:55:55 -0700 3289 3290 Changes affecting future timestamps 3291 3292 Egypt's spring-forward transition is at 24:00 on April's last Thursday, 3293 not 00:00 on April's last Friday. 2015's transition will therefore be on 3294 Thursday, April 30 at 24:00, not Friday, April 24 at 00:00. Similar fixes 3295 apply to 2026, 2037, 2043, etc. (Thanks to Steffen Thorsen.) 3296 3297 Changes affecting past timestamps 3298 3299 The following changes affect some pre-1991 Chile-related timestamps 3300 in America/Santiago, Antarctica/Palmer, and Pacific/Easter. 3301 3302 The 1910 transition was January 10, not January 1. 3303 3304 The 1918 transition was September 10, not September 1. 3305 3306 The UT -04 time observed from 1932 to 1942 is now considered to 3307 be standard time, not year-round DST. 3308 3309 Santiago observed DST (UT -03) from 1946-07-15 through 3310 1946-08-31, then reverted to standard time, then switched to -05 3311 on 1947-04-01. 3312 3313 Assume transitions before 1968 were at 00:00, since we have no data 3314 saying otherwise. 3315 3316 The spring 1988 transition was 1988-10-09, not 1988-10-02. 3317 The fall 1990 transition was 1990-03-11, not 1990-03-18. 3318 3319 Assume no UT offset change for Pacific/Easter on 1890-01-01, 3320 and omit all transitions on Pacific/Easter from 1942 through 1946 3321 since we have no data suggesting that they existed. 3322 3323 One more zone has been turned into a link, as it differed 3324 from an existing zone only for older timestamps. As usual, 3325 this change affects UT offsets in pre-1970 timestamps only. 3326 The zone's old contents have been moved to the 'backzone' file. 3327 The affected zone is America/Montreal. 3328 3329 Changes affecting commentary 3330 3331 Mention the TZUpdater tool. 3332 3333 Mention "The Time Now". (Thanks to Brandon Ramsey.) 3334 3335 3336 Release 2015b - 2015-03-19 23:28:11 -0700 3337 3338 Changes affecting future timestamps 3339 3340 Mongolia will start observing DST again this year, from the last 3341 Saturday in March at 02:00 to the last Saturday in September at 00:00. 3342 (Thanks to Ganbold Tsagaankhuu.) 3343 3344 Palestine will start DST on March 28, not March 27. Also, 3345 correct the fall 2014 transition from September 26 to October 24. 3346 Adjust future predictions accordingly. (Thanks to Steffen Thorsen.) 3347 3348 Changes affecting past timestamps 3349 3350 The 1982 zone shift in Pacific/Easter has been corrected, fixing a 2015a 3351 regression. (Thanks to Stuart Bishop for reporting the problem.) 3352 3353 Some more zones have been turned into links, when they differed 3354 from existing zones only for older timestamps. As usual, 3355 these changes affect UT offsets in pre-1970 timestamps only. 3356 Their old contents have been moved to the 'backzone' file. 3357 The affected zones are: America/Antigua, America/Cayman, 3358 Pacific/Midway, and Pacific/Saipan. 3359 3360 Changes affecting time zone abbreviations 3361 3362 Correct the 1992-2010 DST abbreviation in Volgograd from "MSK" to "MSD". 3363 (Thanks to Hank W.) 3364 3365 Changes affecting code 3366 3367 Fix integer overflow bug in reference 'mktime' implementation. 3368 (Problem reported by Jrg Richter.) 3369 3370 Allow -Dtime_tz=time_t compilations, and allow -Dtime_tz=... libraries 3371 to be used in the same executable as standard-library time_t functions. 3372 (Problems reported by Bradley White.) 3373 3374 Changes affecting commentary 3375 3376 Cite the recent Mexican decree changing Quintana Roo's time zone. 3377 (Thanks to Carlos Ral Perasso.) 3378 3379 Likewise for the recent Chilean decree. (Thanks to Eduardo Romero Urra.) 3380 3381 Update info about Mars time. 3382 3383 3384 Release 2015a - 2015-01-29 22:35:20 -0800 3385 3386 Changes affecting future timestamps 3387 3388 The Mexican state of Quintana Roo, represented by America/Cancun, 3389 will shift from Central Time with DST to Eastern Time without DST 3390 on 2015-02-01 at 02:00. (Thanks to Steffen Thorsen and Gwillim Law.) 3391 3392 Chile will not change clocks in April or thereafter; its new standard time 3393 will be its old daylight saving time. This affects America/Santiago, 3394 Pacific/Easter, and Antarctica/Palmer. (Thanks to Juan Correa.) 3395 3396 New leap second 2015-06-30 23:59:60 UTC as per IERS Bulletin C 49. 3397 (Thanks to Tim Parenti.) 3398 3399 Changes affecting past timestamps 3400 3401 Iceland observed DST in 1919 and 1921, and its 1939 fallback 3402 transition was Oct. 29, not Nov. 29. Remove incorrect data from 3403 Shanks about time in Iceland between 1837 and 1908. 3404 3405 Some more zones have been turned into links, when they differed 3406 from existing zones only for older timestamps. As usual, 3407 these changes affect UT offsets in pre-1970 timestamps only. 3408 Their old contents have been moved to the 'backzone' file. 3409 The affected zones are: Asia/Aden, Asia/Bahrain, Asia/Kuwait, 3410 and Asia/Muscat. 3411 3412 Changes affecting code 3413 3414 tzalloc now scrubs time zone abbreviations compatibly with the way 3415 that tzset always has, by replacing invalid bytes with '_' and by 3416 shortening too-long abbreviations. 3417 3418 tzselect ports to POSIX awk implementations, no longer mishandles 3419 POSIX TZ settings when GNU awk is used, and reports POSIX TZ 3420 settings to the user. (Thanks to Stefan Kuhn.) 3421 3422 Changes affecting build procedure 3423 3424 'make check' now checks for links to links in the data. 3425 One such link (for Africa/Asmera) has been fixed. 3426 (Thanks to Stephen Colebourne for pointing out the problem.) 3427 3428 Changes affecting commentary 3429 3430 The leapseconds file commentary now mentions the expiration date. 3431 (Problem reported by Martin Burnicki.) 3432 3433 Update Mexican Library of Congress URL. 3434 3435 3436 Release 2014j - 2014-11-10 17:37:11 -0800 3437 3438 Changes affecting current and future timestamps 3439 3440 Turks & Caicos' switch from US eastern time to UT -04 year-round 3441 did not occur on 2014-11-02 at 02:00. It's currently scheduled 3442 for 2015-11-01 at 02:00. (Thanks to Chris Walton.) 3443 3444 Changes affecting past timestamps 3445 3446 Many pre-1989 timestamps have been corrected for Asia/Seoul and 3447 Asia/Pyongyang, based on sources for the Korean-language Wikipedia 3448 entry for time in Korea. (Thanks to Sanghyuk Jung.) Also, no 3449 longer guess that Pyongyang mimicked Seoul time after World War II, 3450 as this is politically implausible. 3451 3452 Some more zones have been turned into links, when they differed 3453 from existing zones only for older timestamps. As usual, 3454 these changes affect UT offsets in pre-1970 timestamps only. 3455 Their old contents have been moved to the 'backzone' file. 3456 The affected zones are: Africa/Addis_Ababa, Africa/Asmara, 3457 Africa/Dar_es_Salaam, Africa/Djibouti, Africa/Kampala, 3458 Africa/Mogadishu, Indian/Antananarivo, Indian/Comoro, and 3459 Indian/Mayotte. 3460 3461 Changes affecting commentary 3462 3463 The commentary is less enthusiastic about Shanks as a source, 3464 and is more careful to distinguish UT from UTC. 3465 3466 3467 Release 2014i - 2014-10-21 22:04:57 -0700 3468 3469 Changes affecting future timestamps 3470 3471 Pacific/Fiji will observe DST from 2014-11-02 02:00 to 2015-01-18 03:00. 3472 (Thanks to Ken Rylander for the heads-up.) Guess that future 3473 years will use a similar pattern. 3474 3475 A new Zone Pacific/Bougainville, for the part of Papua New Guinea 3476 that plans to switch from UT +10 to +11 on 2014-12-28 at 02:00. 3477 (Thanks to Kiley Walbom for the heads-up.) 3478 3479 Changes affecting time zone abbreviations 3480 3481 Since Belarus is not changing its clocks even though Moscow is, 3482 the time zone abbreviation in Europe/Minsk is changing from FET 3483 to its more traditional value MSK on 2014-10-26 at 01:00. 3484 (Thanks to Alexander Bokovoy for the heads-up about Belarus.) 3485 3486 The new abbreviation IDT stands for the pre-1976 use of UT +08 in 3487 Indochina, to distinguish it better from ICT (+07). 3488 3489 Changes affecting past timestamps 3490 3491 Many timestamps have been corrected for Asia/Ho_Chi_Minh before 1976 3492 (thanks to Trn Ngc Qun for an indirect pointer to Trn Tin Bnh's 3493 authoritative book). Asia/Ho_Chi_Minh has been added to 3494 zone1970.tab, to give tzselect users in Vietnam two choices, 3495 since north and south Vietnam disagreed after our 1970 cutoff. 3496 3497 Asia/Phnom_Penh and Asia/Vientiane have been turned into links, as 3498 they differed from existing zones only for older timestamps. As 3499 usual, these changes affect pre-1970 timestamps only. Their old 3500 contents have been moved to the 'backzone' file. 3501 3502 Changes affecting code 3503 3504 The time-related library functions now set errno on failure, and 3505 some crashes in the new tzalloc-related library functions have 3506 been fixed. (Thanks to Christos Zoulas for reporting most of 3507 these problems and for suggesting fixes.) 3508 3509 If USG_COMPAT is defined and the requested timestamp is standard time, 3510 the tz library's localtime and mktime functions now set the extern 3511 variable timezone to a value appropriate for that timestamp; and 3512 similarly for ALTZONE, daylight saving time, and the altzone variable. 3513 This change is a companion to the tzname change in 2014h, and is 3514 designed to make timezone and altzone more compatible with tzname. 3515 3516 The tz library's functions now set errno to EOVERFLOW if they fail 3517 because the result cannot be represented. ctime and ctime_r now 3518 return NULL and set errno when a timestamp is out of range, rather 3519 than having undefined behavior. 3520 3521 Some bugs associated with the new 2014g functions have been fixed. 3522 This includes a bug that largely incapacitated the new functions 3523 time2posix_z and posix2time_z. (Thanks to Christos Zoulas.) 3524 It also includes some uses of uninitialized variables after tzalloc. 3525 The new code uses the standard type 'ssize_t', which the Makefile 3526 now gives porting advice about. 3527 3528 Changes affecting commentary 3529 3530 Updated URLs for NRC Canada (thanks to Matt Johnson and Brian Inglis). 3531 3532 3533 Release 2014h - 2014-09-25 18:59:03 -0700 3534 3535 Changes affecting past timestamps 3536 3537 America/Jamaica's 1974 spring-forward transition was Jan. 6, not Apr. 28. 3538 3539 Shanks says Asia/Novokuznetsk switched from LMT (not "NMT") on 1924-05-01, 3540 not 1920-01-06. The old entry was based on a misinterpretation of Shanks. 3541 3542 Some more zones have been turned into links, when they differed 3543 from existing zones only for older timestamps. As usual, 3544 these changes affect UT offsets in pre-1970 timestamps only. 3545 Their old contents have been moved to the 'backzone' file. 3546 The affected zones are: Africa/Blantyre, Africa/Bujumbura, 3547 Africa/Gaborone, Africa/Harare, Africa/Kigali, Africa/Lubumbashi, 3548 Africa/Lusaka, Africa/Maseru, and Africa/Mbabane. 3549 3550 Changes affecting code 3551 3552 zdump -V and -v now output gmtoff= values on all platforms, 3553 not merely on platforms defining TM_GMTOFF. 3554 3555 The tz library's localtime and mktime functions now set tzname to a value 3556 appropriate for the requested timestamp, and zdump now uses this 3557 on platforms not defining TM_ZONE, fixing a 2014g regression. 3558 (Thanks to Tim Parenti for reporting the problem.) 3559 3560 The tz library no longer sets tzname if localtime or mktime fails. 3561 3562 zdump -c no longer mishandles transitions near year boundaries. 3563 (Thanks to Tim Parenti for reporting the problem.) 3564 3565 An access to uninitialized data has been fixed. 3566 (Thanks to Jrg Richter for reporting the problem.) 3567 3568 When THREAD_SAFE is defined, the code ports to the C11 memory model. 3569 A memory leak has been fixed if ALL_STATE and THREAD_SAFE are defined 3570 and two threads race to initialize data used by gmtime-like functions. 3571 (Thanks to Andy Heninger for reporting the problems.) 3572 3573 Changes affecting build procedure 3574 3575 'make check' now checks better for properly sorted data. 3576 3577 Changes affecting documentation and commentary 3578 3579 zdump's gmtoff=N output is now documented, and its isdst=D output 3580 is now documented to possibly output D values other than 0 or 1. 3581 3582 zdump -c's treatment of years is now documented to use the 3583 Gregorian calendar and Universal Time without leap seconds, 3584 and its behavior at cutoff boundaries is now documented better. 3585 (Thanks to Arthur David Olson and Tim Parenti for reporting the problems.) 3586 3587 Programs are now documented to use the proleptic Gregorian calendar. 3588 (Thanks to Alan Barrett for the suggestion.) 3589 3590 Fractional-second GMT offsets have been documented for civil time 3591 in 19th-century Chennai, Jakarta, and New York. 3592 3593 3594 Release 2014g - 2014-08-28 12:31:23 -0700 3595 3596 Changes affecting future timestamps 3597 3598 Turks & Caicos is switching from US eastern time to UT -04 3599 year-round, modeled as a switch on 2014-11-02 at 02:00. 3600 [As noted in 2014j, this switch was later delayed.] 3601 3602 Changes affecting past timestamps 3603 3604 Time in Russia or the USSR before 1926 or so has been corrected by 3605 a few seconds in the following zones: Asia/Irkutsk, 3606 Asia/Krasnoyarsk, Asia/Omsk, Asia/Samarkand, Asia/Tbilisi, 3607 Asia/Vladivostok, Asia/Yakutsk, Europe/Riga, Europe/Samara. For 3608 Asia/Yekaterinburg the correction is a few minutes. (Thanks to 3609 Vladimir Karpinsky.) 3610 3611 The Portuguese decree of 1911-05-26 took effect on 1912-01-01. 3612 This affects 1911 timestamps in Africa/Bissau, Africa/Luanda, 3613 Atlantic/Azores, and Atlantic/Madeira. Also, Lisbon's pre-1912 3614 GMT offset was -0:36:45 (rounded from -0:36:44.68), not -0:36:32. 3615 (Thanks to Stephen Colebourne for pointing to the decree.) 3616 3617 Asia/Dhaka ended DST on 2009-12-31 at 24:00, not 23:59. 3618 3619 A new file 'backzone' contains data which may appeal to 3620 connoisseurs of old timestamps, although it is out of scope for 3621 the tz database, is often poorly sourced, and contains some data 3622 that is known to be incorrect. The new file is not recommended 3623 for ordinary use and its entries are not installed by default. 3624 (Thanks to Lester Caine for the high-quality Jersey, Guernsey, and 3625 Isle of Man entries.) 3626 3627 Some more zones have been turned into links, when they differed 3628 from existing zones only for older timestamps. As usual, 3629 these changes affect UT offsets in pre-1970 timestamps only. 3630 Their old contents have been moved to the 'backzone' file. 3631 The affected zones are: Africa/Bangui, Africa/Brazzaville, 3632 Africa/Douala, Africa/Kinshasa, Africa/Libreville, Africa/Luanda, 3633 Africa/Malabo, Africa/Niamey, and Africa/Porto-Novo. 3634 3635 Changes affecting code 3636 3637 Unless NETBSD_INSPIRED is defined to 0, the tz library now 3638 supplies functions for creating and using objects that represent 3639 timezones. The new functions are tzalloc, tzfree, localtime_rz, 3640 mktime_z, and (if STD_INSPIRED is also defined) posix2time_z and 3641 time2posix_z. They are intended for performance: for example, 3642 localtime_rz (unlike localtime_r) is trivially thread-safe without 3643 locking. (Thanks to Christos Zoulas for proposing NetBSD-inspired 3644 functions, and to Alan Barrett and Jonathan Lennox for helping to 3645 debug the change.) 3646 3647 zdump now builds with the tz library unless USE_LTZ is defined to 0, 3648 This lets zdump use tz features even if the system library lacks them. 3649 To build zdump with the system library, use 'make CFLAGS=-DUSE_LTZ=0 3650 TZDOBJS=zdump.o CHECK_TIME_T_ALTERNATIVES='. 3651 3652 zdump now uses localtime_rz if available, as it's significantly faster, 3653 and it can help zdump better diagnose invalid timezone names. 3654 Define HAVE_LOCALTIME_RZ to 0 to suppress this. HAVE_LOCALTIME_RZ 3655 defaults to 1 if NETBSD_INSPIRED && USE_LTZ. When localtime_rz is 3656 not available, zdump now uses localtime_r and tzset if available, 3657 as this is a bit cleaner and faster than plain localtime. Compile 3658 with -DHAVE_LOCALTIME_R=0 and/or -DHAVE_TZSET=0 if your system 3659 lacks these two functions. 3660 3661 If THREAD_SAFE is defined to 1, the tz library is now thread-safe. 3662 Although not needed for tz's own applications, which are single-threaded, 3663 this supports POSIX better if the tz library is used in multithreaded apps. 3664 3665 Some crashes have been fixed when zdump or the tz library is given 3666 invalid or outlandish input. 3667 3668 The tz library no longer mishandles leap seconds on platforms with 3669 unsigned time_t in timezones that lack ordinary transitions after 1970. 3670 3671 The tz code now attempts to infer TM_GMTOFF and TM_ZONE if not 3672 already defined, to make it easier to configure on common platforms. 3673 Define NO_TM_GMTOFF and NO_TM_ZONE to suppress this. 3674 3675 Unless the new macro UNINIT_TRAP is defined to 1, the tz code now 3676 assumes that reading uninitialized memory yields garbage values 3677 but does not cause other problems such as traps. 3678 3679 If TM_GMTOFF is defined and UNINIT_TRAP is 0, mktime is now 3680 more likely to guess right for ambiguous timestamps near 3681 transitions where tm_isdst does not change. 3682 3683 If HAVE_STRFTIME_L is defined to 1, the tz library now defines 3684 strftime_l for compatibility with recent versions of POSIX. 3685 Only the C locale is supported, though. HAVE_STRFTIME_L defaults 3686 to 1 on recent POSIX versions, and to 0 otherwise. 3687 3688 tzselect -c now uses a hybrid distance measure that works better 3689 in Africa. (Thanks to Alan Barrett for noting the problem.) 3690 3691 The C source code now ports to NetBSD when GCC_DEBUG_FLAGS is used, 3692 or when time_tz is defined. 3693 3694 When HAVE_UTMPX_H is set the 'date' command now builds on systems 3695 whose <utmpx.h> file does not define WTMPX_FILE, and when setting 3696 the date it updates the wtmpx file if _PATH_WTMPX is defined. 3697 This affects GNU/Linux and similar systems. 3698 3699 For easier maintenance later, some C code has been simplified, 3700 some lint has been removed, and the code has been tweaked so that 3701 plain 'make' is more likely to work. 3702 3703 The C type 'bool' is now used for boolean values, instead of 'int'. 3704 3705 The long-obsolete LOCALE_HOME code has been removed. 3706 3707 The long-obsolete 'gtime' function has been removed. 3708 3709 Changes affecting build procedure 3710 3711 'zdump' no longer links in ialloc.o, as it's not needed. 3712 3713 'make check_time_t_alternatives' no longer assumes GNU diff. 3714 3715 Changes affecting distribution tarballs 3716 3717 The files checktab.awk and zoneinfo2tdf.pl are now distributed in 3718 the tzdata tarball instead of the tzcode tarball, since they help 3719 maintain the data. The NEWS and Theory files are now also 3720 distributed in the tzdata tarball, as they're relevant for data. 3721 (Thanks to Alan Barrett for pointing this out.) Also, the 3722 leapseconds.awk file is no longer distributed in the tzcode 3723 tarball, since it belongs in the tzdata tarball (where 2014f 3724 inadvertently also distributed it). 3725 3726 Changes affecting documentation and commentary 3727 3728 A new file CONTRIBUTING is distributed. (Thanks to Tim Parenti for 3729 suggesting a CONTRIBUTING file, and to Tony Finch and Walter Harms 3730 for debugging it.) 3731 3732 The man pages have been updated to use function prototypes, 3733 to document thread-safe variants like localtime_r, and to document 3734 the NetBSD-inspired functions tzalloc, tzfree, localtime_rz, and 3735 mktime_z. 3736 3737 The fields in Link lines have been renamed to be more descriptive 3738 and more like the parameters of 'ln'. LINK-FROM has become TARGET, 3739 and LINK-TO has become LINK-NAME. 3740 3741 tz-link.htm mentions the IETF's tzdist working group; Windows 3742 Runtime etc. (thanks to Matt Johnson); and HP-UX's tztab. 3743 3744 Some broken URLs have been fixed in the commentary. (Thanks to 3745 Lester Caine.) 3746 3747 Commentary about Philippines DST has been updated, and commentary 3748 on pre-1970 time in India has been added. 3749 3750 3751 Release 2014f - 2014-08-05 17:42:36 -0700 3752 3753 Changes affecting future timestamps 3754 3755 Russia will subtract an hour from most of its time zones on 2014-10-26 3756 at 02:00 local time. (Thanks to Alexander Krivenyshev.) 3757 There are a few exceptions: Magadan Oblast (Asia/Magadan) and Zabaykalsky 3758 Krai are subtracting two hours; conversely, Chukotka Autonomous Okrug 3759 (Asia/Anadyr), Kamchatka Krai (Asia/Kamchatka), Kemerovo Oblast 3760 (Asia/Novokuznetsk), and the Samara Oblast and the Udmurt Republic 3761 (Europe/Samara) are not changing their clocks. The changed zones are 3762 Europe/Kaliningrad, Europe/Moscow, Europe/Simferopol, Europe/Volgograd, 3763 Asia/Yekaterinburg, Asia/Omsk, Asia/Novosibirsk, Asia/Krasnoyarsk, 3764 Asia/Irkutsk, Asia/Yakutsk, Asia/Vladivostok, Asia/Khandyga, 3765 Asia/Sakhalin, and Asia/Ust-Nera; Asia/Magadan will have two hours 3766 subtracted; and Asia/Novokuznetsk's time zone abbreviation is affected, 3767 but not its UTC offset. Two zones are added: Asia/Chita (split 3768 from Asia/Yakutsk, and also with two hours subtracted) and 3769 Asia/Srednekolymsk (split from Asia/Magadan, but with only one hour 3770 subtracted). (Thanks to Tim Parenti for much of the above.) 3771 3772 Changes affecting time zone abbreviations 3773 3774 Australian eastern time zone abbreviations are now AEST/AEDT not EST, 3775 and similarly for the other Australian zones. That is, for eastern 3776 standard and daylight saving time the abbreviations are AEST and AEDT 3777 instead of the former EST for both; similarly, ACST/ACDT, ACWST/ACWDT, 3778 and AWST/AWDT are now used instead of the former CST, CWST, and WST. 3779 This change does not affect UT offsets, only time zone abbreviations. 3780 (Thanks to Rich Tibbett and many others.) 3781 3782 Asia/Novokuznetsk shifts from NOVT to KRAT (remaining on UT +07) 3783 effective 2014-10-26 at 02:00 local time. 3784 3785 The time zone abbreviation for Xinjiang Time (observed in rmqi) 3786 has been changed from URUT to XJT. (Thanks to Luther Ma.) 3787 3788 Prefer MSK/MSD for Moscow time in Russia, even in other cities. 3789 Similarly, prefer EET/EEST for eastern European time in Russia. 3790 3791 Change time zone abbreviations in (western) Samoa to use "ST" and 3792 "DT" suffixes, as this is more likely to match common practice. 3793 Prefix "W" to (western) Samoa time when its standard-time offset 3794 disagrees with that of American Samoa. 3795 3796 America/Metlakatla now uses PST, not MeST, to abbreviate its time zone. 3797 3798 Time zone abbreviations have been updated for Japan's two time 3799 zones used 1896-1937. JWST now stands for Western Standard 3800 Time, and JCST for Central Standard Time (formerly this was CJT). 3801 These abbreviations are now used for time in Korea, Taiwan, 3802 and Sakhalin while controlled by Japan. 3803 3804 Changes affecting past timestamps 3805 3806 China's five zones have been simplified to two, since the post-1970 3807 differences in the other three seem to have been imaginary. The 3808 zones Asia/Harbin, Asia/Chongqing, and Asia/Kashgar have been 3809 removed; backwards-compatibility links still work, albeit with 3810 different behaviors for timestamps before May 1980. Asia/Urumqi's 3811 1980 transition to UT +08 has been removed, so that it is now at 3812 +06 and not +08. (Thanks to Luther Ma and to Alois Treindl; 3813 Treindl sent helpful translations of two papers by Guo Qingsheng.) 3814 3815 Some zones have been turned into links, when they differed from existing 3816 zones only for older UT offsets where data entries were likely invented. 3817 These changes affect UT offsets in pre-1970 timestamps only. This is 3818 similar to the change in release 2013e, except this time for western 3819 Africa. The affected zones are: Africa/Bamako, Africa/Banjul, 3820 Africa/Conakry, Africa/Dakar, Africa/Freetown, Africa/Lome, 3821 Africa/Nouakchott, Africa/Ouagadougou, Africa/Sao_Tome, and 3822 Atlantic/St_Helena. This also affects the backwards-compatibility 3823 link Africa/Timbuktu. (Thanks to Alan Barrett, Stephen Colebourne, 3824 Tim Parenti, and David Patte for reporting problems in earlier 3825 versions of this change.) 3826 3827 Asia/Shanghai's pre-standard-time UT offset has been changed from 3828 8:05:57 to 8:05:43, the location of Xujiahui Observatory. Its 3829 transition to standard time has been changed from 1928 to 1901. 3830 3831 Asia/Taipei switched to JWST on 1896-01-01, then to JST on 1937-10-01, 3832 then to CST on 1945-09-21 at 01:00, and did not observe DST in 1945. 3833 In 1946 it observed DST from 05-15 through 09-30; in 1947 3834 from 04-15 through 10-31; and in 1979 from 07-01 through 09-30. 3835 (Thanks to Yu-Cheng Chuang.) 3836 3837 Asia/Riyadh's transition to standard time is now 1947-03-14, not 1950. 3838 3839 Europe/Helsinki's 1942 fall-back transition was 10-04 at 01:00, not 3840 10-03 at 00:00. (Thanks to Konstantin Hyppnen.) 3841 3842 Pacific/Pago_Pago has been changed from UT -11:30 to -11 for the 3843 period from 1911 to 1950. 3844 3845 Pacific/Chatham has been changed to New Zealand standard time plus 3846 45 minutes for the period before 1957, reflecting a 1956 remark in 3847 the New Zealand parliament. 3848 3849 Europe/Budapest has several pre-1946 corrections: in 1918 the transition 3850 out of DST was on 09-16, not 09-29; in 1919 it was on 11-24, not 09-15; in 3851 1945 it was on 11-01, not 11-03; in 1941 the transition to DST was 04-08 3852 not 04-06 at 02:00; and there was no DST in 1920. 3853 3854 Africa/Accra is now assumed to have observed DST from 1920 through 1935. 3855 3856 Time in Russia before 1927 or so has been corrected by a few seconds in 3857 the following zones: Europe/Moscow, Asia/Irkutsk, Asia/Tbilisi, 3858 Asia/Tashkent, Asia/Vladivostok, Asia/Yekaterinburg, Europe/Helsinki, and 3859 Europe/Riga. Also, Moscow's location has been changed to its Kilometer 0 3860 point. (Thanks to Vladimir Karpinsky for the Moscow changes.) 3861 3862 Changes affecting data format 3863 3864 A new file 'zone1970.tab' supersedes 'zone.tab' in the installed data. 3865 The new file's extended format allows multiple country codes per zone. 3866 The older file is still installed but is deprecated; its format is 3867 not changing and it will still be distributed for a while, but new 3868 applications should use the new file. 3869 3870 The new file format simplifies maintenance of obscure locations. 3871 To test this, it adds coverage for the Crozet Islands and the 3872 Scattered Islands. (Thanks to Tobias Conradi and Antoine Leca.) 3873 3874 The file 'iso3166.tab' is planned to switch from ASCII to UTF-8. 3875 It is still ASCII now, but commentary about the switch has been added. 3876 The new file 'zone1970.tab' already uses UTF-8. 3877 3878 Changes affecting code 3879 3880 'localtime', 'mktime', etc. now use much less stack space if ALL_STATE 3881 is defined. (Thanks to Elliott Hughes for reporting the problem.) 3882 3883 'zic' no longer mishandles input when ignoring case in locales that 3884 are not compatible with English, e.g., unibyte Turkish locales when 3885 compiled with HAVE_GETTEXT. 3886 3887 Error diagnostics of 'zic' and 'yearistype' have been reworded so that 3888 they no longer use ASCII '-' as if it were a dash. 3889 3890 'zic' now rejects output file names that contain '.' or '..' components. 3891 (Thanks to Tim Parenti for reporting the problem.) 3892 3893 'zic -v' now warns about output file names that do not follow 3894 POSIX rules, or that contain a digit or '.'. (Thanks to Arthur 3895 David Olson for starting the ball rolling on this.) 3896 3897 Some lint has been removed when using GCC_DEBUG_FLAGS with GCC 4.9.0. 3898 3899 Changes affecting build procedure 3900 3901 'zic' no longer links in localtime.o and asctime.o, as they're not needed. 3902 (Thanks to John Cochran.) 3903 3904 Changes affecting documentation and commentary 3905 3906 The 'Theory' file documents legacy names, the longstanding 3907 exceptions to the POSIX-inspired file name rules. 3908 3909 The 'zic' documentation clarifies the role of time types when 3910 interpreting dates. (Thanks to Arthur David Olson.) 3911 3912 Documentation and commentary now prefer UTF-8 to US-ASCII, 3913 allowing the use of proper accents in foreign words and names. 3914 Code and data have not changed because of this. (Thanks to 3915 Garrett Wollman, Ian Abbott, and Guy Harris for helping to debug 3916 this.) 3917 3918 Non-HTML documentation and commentary now use plain-text URLs instead of 3919 HTML insertions, and are more consistent about bracketing URLs when they 3920 are not already surrounded by white space. (Thanks to suggestions by 3921 Steffen Nurpmeso.) 3922 3923 There is new commentary about Xujiahui Observatory, the five time-zone 3924 project in China from 1918 to 1949, timekeeping in Japanese-occupied 3925 Shanghai, and Tibet Time in the 1950s. The sharp-eyed can spot the 3926 warlord Jin Shuren in the data. 3927 3928 Commentary about the coverage of each Russian zone has been standardized. 3929 (Thanks to Tim Parenti.) 3930 3931 There is new commentary about contemporary timekeeping in Ethiopia. 3932 3933 Obsolete comments about a 2007 proposal for DST in Kuwait has been removed. 3934 3935 There is new commentary about time in Poland in 1919. 3936 3937 Proper credit has been given to DST inventor George Vernon Hudson. 3938 3939 Commentary about time in Metlakatla, AK and Resolute, NU has been 3940 improved, with a new source for the former. 3941 3942 In zone.tab, Pacific/Easter no longer mentions Salas y Gmez, as it 3943 is uninhabited. 3944 3945 Commentary about permanent Antarctic bases has been updated. 3946 3947 Several typos have been corrected. (Thanks to Tim Parenti for 3948 contributing some of these fixes.) 3949 3950 tz-link.htm now mentions the JavaScript libraries Moment Timezone, 3951 TimezoneJS.Date, Walltime-js, and Timezone. (Thanks to a heads-up 3952 from Matt Johnson.) Also, it mentions the Go 'latlong' package. 3953 (Thanks to a heads-up from Dirkjan Ochtman.) 3954 3955 The files usno1988, usno1989, usno1989a, usno1995, usno1997, and usno1998 3956 have been removed. These obsolescent US Naval Observatory entries were no 3957 longer helpful for maintenance. (Thanks to Tim Parenti for the suggestion.) 3958 3959 3960 Release 2014e - 2014-06-12 21:53:52 -0700 3961 3962 Changes affecting near-future timestamps 3963 3964 Egypt's 2014 Ramadan-based transitions are June 26 and July 31 at 24:00. 3965 (Thanks to Imed Chihi.) Guess that from 2015 on Egypt will temporarily 3966 switch to standard time at 24:00 the last Thursday before Ramadan, and 3967 back to DST at 00:00 the first Friday after Ramadan. 3968 3969 Similarly, Morocco's are June 28 at 03:00 and August 2 at 02:00. (Thanks 3970 to Milamber Space Network.) Guess that from 2015 on Morocco will 3971 temporarily switch to standard time at 03:00 the last Saturday before 3972 Ramadan, and back to DST at 02:00 the first Saturday after Ramadan. 3973 3974 Changes affecting past timestamps 3975 3976 The abbreviation "MSM" (Moscow Midsummer Time) is now used instead of 3977 "MSD" for Moscow's double daylight time in summer 1921. Also, a typo 3978 "VLASST" has been repaired to be "VLAST" for Vladivostok summer time 3979 in 1991. (Thanks to Hank W. for reporting the problems.) 3980 3981 Changes affecting commentary 3982 3983 tz-link.htm now cites RFC 7265 for jCal, mentions PTP and the 3984 draft CalDAV extension, updates URLs for TSP, TZInfo, IATA, and 3985 removes stale pointers to World Time Explorer and WORLDTIME. 3986 3987 3988 Release 2014d - 2014-05-27 21:34:40 -0700 3989 3990 Changes affecting code 3991 3992 zic no longer generates files containing timestamps before the Big Bang. 3993 This works around GNOME glib bug 878 3994 <https://gitlab.gnome.org/GNOME/glib/issues/878> 3995 (Thanks to Leonardo Chiquitto for reporting the bug, and to 3996 Arthur David Olson and James Cloos for suggesting improvements to the fix.) 3997 3998 Changes affecting documentation 3999 4000 tz-link.htm now mentions GNOME. 4001 4002 4003 Release 2014c - 2014-05-13 07:44:13 -0700 4004 4005 Changes affecting near-future timestamps 4006 4007 Egypt observes DST starting 2014-05-15 at 24:00. 4008 (Thanks to Ahmad El-Dardiry and Gunther Vermier.) 4009 Details have not been announced, except that DST will not be observed 4010 during Ramadan. Guess that DST will stop during the same Ramadan dates as 4011 Morocco, and that Egypt's future spring and fall transitions will be the 4012 same as 2010 when it last observed DST, namely April's last Friday at 4013 00:00 to September's last Thursday at 23:00 standard time. Also, guess 4014 that Ramadan transitions will be at 00:00 standard time. 4015 4016 Changes affecting code 4017 4018 zic now generates transitions for minimum time values, eliminating guesswork 4019 when handling low-valued timestamps. (Thanks to Arthur David Olson.) 4020 4021 Port to Cygwin sans glibc. (Thanks to Arthur David Olson.) 4022 4023 Changes affecting commentary and documentation 4024 4025 Remove now-confusing comment about Jordan. (Thanks to Oleksii Nochovnyi.) 4026 4027 4028 Release 2014b - 2014-03-24 21:28:50 -0700 4029 4030 Changes affecting near-future timestamps 4031 4032 Crimea switches to Moscow time on 2014-03-30 at 02:00 local time. 4033 (Thanks to Alexander Krivenyshev.) Move its zone.tab entry from UA to RU. 4034 4035 New entry for Troll station, Antarctica. (Thanks to Paul-Inge Flakstad and 4036 Bengt-Inge Larsson.) This is currently an approximation; a better version 4037 will require the zic and localtime fixes mentioned below, and the plan is 4038 to wait for a while until at least the zic fixes propagate. 4039 4040 Changes affecting code 4041 4042 'zic' and 'localtime' no longer reject locations needing four transitions 4043 per year for the foreseeable future. (Thanks to Andrew Main (Zefram).) 4044 Also, 'zic' avoids some unlikely failures due to integer overflow. 4045 4046 Changes affecting build procedure 4047 4048 'make check' now detects Rule lines defined but never used. 4049 The NZAQ rules, an instance of this problem, have been removed. 4050 4051 Changes affecting commentary and documentation 4052 4053 Fix Tuesday/Thursday typo in description of time in Israel. 4054 (Thanks to Bert Katz via Pavel Kharitonov and Mike Frysinger.) 4055 4056 Microsoft Windows 8.1 doesn't support tz database names. (Thanks 4057 to Donald MacQueen.) Instead, the Microsoft Windows Store app 4058 library supports them. 4059 4060 Add comments about Johnston Island time in the 1960s. 4061 (Thanks to Lyle McElhaney.) 4062 4063 Morocco's 2014 DST start will be as predicted. 4064 (Thanks to Sebastien Willemijns.) 4065 4066 4067 Release 2014a - 2014-03-07 23:30:29 -0800 4068 4069 Changes affecting near-future timestamps 4070 4071 Turkey begins DST on 2014-03-31, not 03-30. (Thanks to Faruk Pasin for 4072 the heads-up, and to Tim Parenti for simplifying the update.) 4073 4074 Changes affecting past timestamps 4075 4076 Fiji ended DST on 2014-01-19 at 02:00, not the previously scheduled 03:00. 4077 (Thanks to Steffen Thorsen.) 4078 4079 Ukraine switched from Moscow to Eastern European time on 1990-07-01 4080 (not 1992-01-01), and observed DST during the entire next winter. 4081 (Thanks to Vladimir in Moscow via Alois Treindl.) 4082 4083 In 1988 Israel observed DST from 04-10 to 09-04, not 04-09 to 09-03. 4084 (Thanks to Avigdor Finkelstein.) 4085 4086 Changes affecting code 4087 4088 A uninitialized-storage bug in 'localtime' has been fixed. 4089 (Thanks to Logan Chien.) 4090 4091 Changes affecting the build procedure 4092 4093 The settings for 'make check_web' now default to Ubuntu 13.10. 4094 4095 Changes affecting commentary and documentation 4096 4097 The boundary of the US Pacific time zone is given more accurately. 4098 (Thanks to Alan Mintz.) 4099 4100 Chile's 2014 DST will be as predicted. (Thanks to Jos Miguel Garrido.) 4101 4102 Paraguay's 2014 DST will be as predicted. (Thanks to Carlos Ral Perasso.) 4103 4104 Better descriptions of countries with same time zone history as 4105 Trinidad and Tobago since 1970. (Thanks to Alan Barrett for suggestion.) 4106 4107 Several changes affect tz-link.htm, the main web page. 4108 4109 Mention Time.is (thanks to Even Scharning) and WX-now (thanks to 4110 David Braverman). 4111 4112 Mention xCal (Internet RFC 6321) and jCal. 4113 4114 Microsoft has some support for tz database names. 4115 4116 CLDR data formats include both XML and JSON. 4117 4118 Mention Maggiolo's map of solar vs standard time. 4119 (Thanks to Arthur David Olson.) 4120 4121 Mention TZ4Net. (Thanks to Matt Johnson.) 4122 4123 Mention the timezone-olson Haskell package. 4124 4125 Mention zeitverschiebung.net. (Thanks to Martin Jger.) 4126 4127 Remove moribund links to daylight-savings-time.info and to 4128 Simple Timer + Clocks. 4129 4130 Update two links. (Thanks to Oscar van Vlijmen.) 4131 4132 Fix some formatting glitches, e.g., remove random newlines from 4133 abbr elements' title attributes. 4134 4135 4136 Release 2013i - 2013-12-17 07:25:23 -0800 4137 4138 Changes affecting near-future timestamps: 4139 4140 Jordan switches back to standard time at 00:00 on December 20, 2013. 4141 The 2006-2011 transition schedule is planned to resume in 2014. 4142 (Thanks to Steffen Thorsen.) 4143 4144 Changes affecting past timestamps: 4145 4146 In 2004, Cuba began DST on March 28, not April 4. 4147 (Thanks to Steffen Thorsen.) 4148 4149 Changes affecting code 4150 4151 The compile-time flag NOSOLAR has been removed, as nowadays the 4152 benefit of slightly shrinking runtime table size is outweighed by the 4153 cost of disallowing potential future updates that exceed old limits. 4154 4155 Changes affecting documentation and commentary 4156 4157 The files solar87, solar88, and solar89 are no longer distributed. 4158 They were a negative experiment - that is, a demonstration that 4159 tz data can represent solar time only with some difficulty and error. 4160 Their presence in the distribution caused confusion, as Riyadh 4161 civil time was generally not solar time in those years. 4162 4163 tz-link.htm now mentions Noda Time. (Thanks to Matt Johnson.) 4164 4165 4166 Release 2013h - 2013-10-25 15:32:32 -0700 4167 4168 Changes affecting current and future timestamps: 4169 4170 Libya has switched its UT offset back to +02 without DST, instead 4171 of +01 with DST. (Thanks to Even Scharning.) 4172 4173 Western Sahara (Africa/El_Aaiun) uses Morocco's DST rules. 4174 (Thanks to Gwillim Law.) 4175 4176 Changes affecting future timestamps: 4177 4178 Acre and (we guess) western Amazonas will switch from UT -04 to -05 4179 on 2013-11-10. This affects America/Rio_Branco and America/Eirunepe. 4180 (Thanks to Steffen Thorsen.) 4181 4182 Add entries for DST transitions in Morocco in the year 2038. 4183 This avoids some year-2038 glitches introduced in 2013g. 4184 (Thanks to Yoshito Umaoka for reporting the problem.) 4185 4186 Changes affecting API 4187 4188 The 'tzselect' command no longer requires the 'select' command, 4189 and should now work with /bin/sh on more platforms. It also works 4190 around a bug in BusyBox awk before version 1.21.0. (Thanks to 4191 Patrick 'P. J.' McDermott and Alan Barrett.) 4192 4193 Changes affecting code 4194 4195 Fix localtime overflow bugs with 32-bit unsigned time_t. 4196 4197 zdump no longer assumes sscanf returns maximal values on overflow. 4198 4199 Changes affecting the build procedure 4200 4201 The builder can specify which programs to use, if any, instead of 4202 'ar' and 'ranlib', and libtz.a is now built locally before being 4203 installed. (Thanks to Michael Forney.) 4204 4205 A dependency typo in the 'zdump' rule has been fixed. 4206 (Thanks to Andrew Paprocki.) 4207 4208 The Makefile has been simplified by assuming that 'mkdir -p' and 'cp -f' 4209 work as specified by POSIX.2-1992 or later; this is portable nowadays. 4210 4211 'make clean' no longer removes 'leapseconds', since it's 4212 host-independent and is part of the distribution. 4213 4214 The unused makefile macros TZCSRCS, TZDSRCS, DATESRCS have been removed. 4215 4216 Changes affecting documentation and commentary 4217 4218 tz-link.htm now mentions TC TIMEZONE's draft time zone service protocol 4219 (thanks to Mike Douglass) and TimezoneJS.Date (thanks to Jim Fehrle). 4220 4221 Update URLs in tz-link page. Add URLs for Microsoft Windows, since 4222 8.1 introduces tz support. Remove URLs for Tru64 and UnixWare (no 4223 longer maintained) and for old advisories. SOFA now does C. 4224 4225 Release 2013g - 2013-09-30 21:08:26 -0700 4226 4227 Changes affecting current and near-future timestamps 4228 4229 Morocco now observes DST from the last Sunday in March to the last 4230 Sunday in October, not April to September respectively. (Thanks 4231 to Steffen Thorsen.) 4232 4233 Changes affecting 'zic' 4234 4235 'zic' now runs on platforms that lack both hard links and symlinks. 4236 (Thanks to Theo Veenker for reporting the problem, for MinGW.) 4237 Also, fix some bugs on platforms that lack hard links but have symlinks. 4238 4239 'zic -v' again warns that Asia/Tehran has no POSIX environment variable 4240 to predict the far future, fixing a bug introduced in 2013e. 4241 4242 Changes affecting the build procedure 4243 4244 The 'leapseconds' file is again put into the tzdata tarball. 4245 Also, 'leapseconds.awk', so tzdata is self-contained. (Thanks to 4246 Matt Burgess and Ian Abbott.) The timestamps of these and other 4247 dependent files in tarballs are adjusted more consistently. 4248 4249 Changes affecting documentation and commentary 4250 4251 The README file is now part of the data tarball as well as the code. 4252 It now states that files are public domain unless otherwise specified. 4253 (Thanks to Andrew Main (Zefram) for asking for clarifications.) 4254 Its details about the 1989 release moved to a place of honor near 4255 the end of NEWS. 4256 4257 4258 Release 2013f - 2013-09-24 23:37:36 -0700 4259 4260 Changes affecting near-future timestamps 4261 4262 Tocantins will very likely not observe DST starting this spring. 4263 (Thanks to Steffen Thorsen.) 4264 4265 Jordan will likely stay at UT +03 indefinitely, and will not fall 4266 back this fall. 4267 4268 Palestine will fall back at 00:00, not 01:00. (Thanks to Steffen Thorsen.) 4269 4270 Changes affecting API 4271 4272 The types of the global variables 'timezone' and 'altzone' (if present) 4273 have been changed back to 'long'. This is required for 'timezone' 4274 by POSIX, and for 'altzone' by common practice, e.g., Solaris 11. 4275 These variables were originally 'long' in the tz code, but were 4276 mistakenly changed to 'time_t' in 1987; nobody reported the 4277 incompatibility until now. The difference matters on x32, where 4278 'long' is 32 bits and 'time_t' is 64. (Thanks to Elliott Hughes.) 4279 4280 Changes affecting the build procedure 4281 4282 Avoid long strings in leapseconds.awk to work around a mawk bug. 4283 (Thanks to Cyril Baurand.) 4284 4285 Changes affecting documentation and commentary 4286 4287 New file 'NEWS' that contains release notes like this one. 4288 4289 Paraguay's law does not specify DST transition time; 00:00 is customary. 4290 (Thanks to Waldemar Villamayor-Venialbo.) 4291 4292 Minor capitalization fixes. 4293 4294 Changes affecting version-control only 4295 4296 The experimental GitHub repository now contains annotated and 4297 signed tags for recent releases, e.g., '2013e' for Release 2013e. 4298 Releases are tagged starting with 2012e; earlier releases were 4299 done differently, and tags would either not have a simple name or 4300 not exactly match what was released. 4301 4302 'make set-timestamps' is now simpler and a bit more portable. 4303 4304 4305 Release 2013e - 2013-09-19 23:50:04 -0700 4306 4307 Changes affecting near-future timestamps 4308 4309 This year Fiji will start DST on October 27, not October 20. 4310 (Thanks to David Wheeler for the heads-up.) For now, guess that 4311 Fiji will continue to spring forward the Sunday before the fourth 4312 Monday in October. 4313 4314 Changes affecting current and future time zone abbreviations 4315 4316 Use WIB/WITA/WIT rather than WIT/CIT/EIT for alphabetic Indonesian 4317 time zone abbreviations since 1932. (Thanks to George Ziegler, 4318 Priyadi Iman Nurcahyo, Zakaria, Jason Grimes, Martin Pitt, and 4319 Benny Lin.) This affects Asia/Dili, Asia/Jakarta, Asia/Jayapura, 4320 Asia/Makassar, and Asia/Pontianak. 4321 4322 Use ART (UT -03, standard time), rather than WARST (also -03, but 4323 daylight saving time) for San Luis, Argentina since 2009. 4324 4325 Changes affecting Godthb timestamps after 2037 if version mismatch 4326 4327 Allow POSIX-like TZ strings where the transition time's hour can 4328 range from -167 through 167, instead of the POSIX-required 0 4329 through 24. E.g., TZ='FJT-12FJST,M10.3.1/146,M1.3.4/75' for the 4330 new Fiji rules. This is a more compact way to represent 4331 far-future timestamps for America/Godthab, America/Santiago, 4332 Antarctica/Palmer, Asia/Gaza, Asia/Hebron, Asia/Jerusalem, 4333 Pacific/Easter, and Pacific/Fiji. Other zones are unaffected by 4334 this change. (Derived from a suggestion by Arthur David Olson.) 4335 4336 Allow POSIX-like TZ strings where daylight saving time is in 4337 effect all year. E.g., TZ='WART4WARST,J1/0,J365/25' for Western 4338 Argentina Summer Time all year. This supports a more compact way 4339 to represent the 2013d data for America/Argentina/San_Luis. 4340 Because of the change for San Luis noted above this change does not 4341 affect the current data. (Thanks to Andrew Main (Zefram) for 4342 suggestions that improved this change.) 4343 4344 Where these two TZ changes take effect, there is a minor extension 4345 to the tz file format in that it allows new values for the 4346 embedded TZ-format string, and the tz file format version number 4347 has therefore been increased from 2 to 3 as a precaution. 4348 Version-2-based client code should continue to work as before for 4349 all timestamps before 2038. Existing version-2-based client code 4350 (tzcode, GNU/Linux, Solaris) has been tested on version-3-format 4351 files, and typically works in practice even for timestamps after 4352 2037; the only known exception is America/Godthab. 4353 4354 Changes affecting timestamps before 1970 4355 4356 Pacific/Johnston is now a link to Pacific/Honolulu. This corrects 4357 some errors before 1947. 4358 4359 Some zones have been turned into links, when they differ from existing 4360 zones only in older data entries that were likely invented or that 4361 differ only in LMT or transitions from LMT. These changes affect 4362 only timestamps before 1943. The affected zones are: 4363 Africa/Juba, America/Anguilla, America/Aruba, America/Dominica, 4364 America/Grenada, America/Guadeloupe, America/Marigot, 4365 America/Montserrat, America/St_Barthelemy, America/St_Kitts, 4366 America/St_Lucia, America/St_Thomas, America/St_Vincent, 4367 America/Tortola, and Europe/Vaduz. (Thanks to Alois Treindl for 4368 confirming that the old Europe/Vaduz zone was wrong and the new 4369 link is better for WWII-era times.) 4370 4371 Change Kingston Mean Time from -5:07:12 to -5:07:11. This affects 4372 America/Cayman, America/Jamaica and America/Grand_Turk timestamps 4373 from 1890 to 1912. 4374 4375 Change the UT offset of Bern Mean Time from 0:29:44 to 0:29:46. 4376 This affects Europe/Zurich timestamps from 1853 to 1894. (Thanks 4377 to Alois Treindl.) 4378 4379 Change the date of the circa-1850 Zurich transition from 1849-09-12 4380 to 1853-07-16, overriding Shanks with data from Messerli about 4381 postal and telegraph time in Switzerland. 4382 4383 Changes affecting time zone abbreviations before 1970 4384 4385 For Asia/Jakarta, use BMT (not JMT) for mean time from 1923 to 1932, 4386 as Jakarta was called Batavia back then. 4387 4388 Changes affecting API 4389 4390 The 'zic' command now outputs a dummy transition when far-future 4391 data can't be summarized using a TZ string, and uses a 402-year 4392 window rather than a 400-year window. For the current data, this 4393 affects only the Asia/Tehran file. It does not affect any of the 4394 timestamps that this file represents, so zdump outputs the same 4395 information as before. (Thanks to Andrew Main (Zefram).) 4396 4397 The 'date' command has a new '-r' option, which lets you specify 4398 the integer time to display, a la FreeBSD. 4399 4400 The 'tzselect' command has two new options '-c' and '-n', which lets you 4401 select a zone based on latitude and longitude. 4402 4403 The 'zic' command's '-v' option now warns about constructs that 4404 require the new version-3 binary file format. (Thanks to Arthur 4405 David Olson for the suggestion.) 4406 4407 Support for floating-point time_t has been removed. 4408 It was always dicey, and POSIX no longer requires it. 4409 (Thanks to Eric Blake for suggesting to the POSIX committee to 4410 remove it, and thanks to Alan Barrett, Clive D.W. Feather, Andy 4411 Heninger, Arthur David Olson, and Alois Treindl, for reporting 4412 bugs and elucidating some of the corners of the old floating-point 4413 implementation.) 4414 4415 The signatures of 'offtime', 'timeoff', and 'gtime' have been 4416 changed back to the old practice of using 'long' to represent UT 4417 offsets. This had been inadvertently and mistakenly changed to 4418 'int_fast32_t'. (Thanks to Christos Zoulas.) 4419 4420 The code avoids undefined behavior on integer overflow in some 4421 more places, including gmtime, localtime, mktime and zdump. 4422 4423 Changes affecting the zdump utility 4424 4425 zdump now outputs "UT" when referring to Universal Time, not "UTC". 4426 "UTC" does not make sense for timestamps that predate the introduction 4427 of UTC, whereas "UT", a more generic term, does. (Thanks to Steve Allen 4428 for clarifying UT vs UTC.) 4429 4430 Data changes affecting behavior of tzselect and similar programs 4431 4432 Country code BQ is now called the more common name "Caribbean Netherlands" 4433 rather than the more official "Bonaire, St Eustatius & Saba". 4434 4435 Remove from zone.tab the names America/Montreal, America/Shiprock, 4436 and Antarctica/South_Pole, as they are equivalent to existing 4437 same-country-code zones for post-1970 timestamps. The data entries for 4438 these names are unchanged, so the names continue to work as before. 4439 4440 Changes affecting code internals 4441 4442 zic -c now runs way faster on 64-bit hosts when given large numbers. 4443 4444 zic now uses vfprintf to avoid allocating and freeing some memory. 4445 4446 tzselect now computes the list of continents from the data, 4447 rather than have it hard-coded. 4448 4449 Minor changes pacify GCC 4.7.3 and GCC 4.8.1. 4450 4451 Changes affecting the build procedure 4452 4453 The 'leapseconds' file is now generated automatically from a 4454 new file 'leap-seconds.list', which is a copy of 4455 <ftp://ftp.nist.gov/pub/time/leap-seconds.list> 4456 A new source file 'leapseconds.awk' implements this. 4457 The goal is simplification of the future maintenance of 'leapseconds'. 4458 4459 When building the 'posix' or 'right' subdirectories, if the 4460 subdirectory would be a copy of the default subdirectory, it is 4461 now made a symbolic link if that is supported. This saves about 4462 2 MB of file system space. 4463 4464 The links America/Shiprock and Antarctica/South_Pole have been 4465 moved to the 'backward' file. This affects only nondefault builds 4466 that omit 'backward'. 4467 4468 Changes affecting version-control only 4469 4470 .gitignore now ignores 'date'. 4471 4472 Changes affecting documentation and commentary 4473 4474 Changes to the 'tzfile' man page 4475 4476 It now mentions that the binary file format may be extended in 4477 future versions by appending data. 4478 4479 It now refers to the 'zdump' and 'zic' man pages. 4480 4481 Changes to the 'zic' man page 4482 4483 It lists conditions that elicit a warning with '-v'. 4484 4485 It says that the behavior is unspecified when duplicate names 4486 are given, or if the source of one link is the target of another. 4487 4488 Its examples are updated to match the latest data. 4489 4490 The definition of white space has been clarified slightly. 4491 (Thanks to Michael Deckers.) 4492 4493 Changes to the 'Theory' file 4494 4495 There is a new section about the accuracy of the tz database, 4496 describing the many ways that errors can creep in, and 4497 explaining why so many of the pre-1970 timestamps are wrong or 4498 misleading (thanks to Steve Allen, Lester Caine, and Garrett 4499 Wollman for discussions that contributed to this). 4500 4501 The 'Theory' file describes LMT better (this follows a 4502 suggestion by Guy Harris). 4503 4504 It refers to the 2013 edition of POSIX rather than the 2004 edition. 4505 4506 It's mentioned that excluding 'backward' should not affect the 4507 other data, and it suggests at least one zone.tab name per 4508 inhabited country (thanks to Stephen Colebourne). 4509 4510 Some longstanding restrictions on names are documented, e.g., 4511 'America/New_York' precludes 'America/New_York/Bronx'. 4512 4513 It gives more reasons for the 1970 cutoff. 4514 4515 It now mentions which time_t variants are supported, such as 4516 signed integer time_t. (Thanks to Paul Goyette for reporting 4517 typos in an experimental version of this change.) 4518 4519 (Thanks to Philip Newton for correcting typos in these changes.) 4520 4521 Documentation and commentary is more careful to distinguish UT in 4522 general from UTC in particular. (Thanks to Steve Allen.) 4523 4524 Add a better source for the Zurich 1894 transition. 4525 (Thanks to Pierre-Yves Berger.) 4526 4527 Update shapefile citations in tz-link.htm. (Thanks to Guy Harris.) 4528 4529 4530 Release 2013d - 2013-07-05 07:38:01 -0700 4531 4532 Changes affecting future timestamps: 4533 4534 Morocco's midsummer transitions this year are July 7 and August 10, 4535 not July 9 and August 8. (Thanks to Andrew Paprocki.) 4536 4537 Israel now falls back on the last Sunday of October. 4538 (Thanks to Ephraim Silverberg.) 4539 4540 Changes affecting past timestamps: 4541 4542 Specify Jerusalem's location more precisely; this changes the pre-1880 4543 times by 2 s. 4544 4545 Changing affecting metadata only: 4546 4547 Fix typos in the entries for country codes BQ and SX. 4548 4549 Changes affecting code: 4550 4551 Rework the code to fix a bug with handling Australia/Macquarie on 4552 32-bit hosts (thanks to Arthur David Olson). 4553 4554 Port to platforms like NetBSD, where time_t can be wider than long. 4555 4556 Add support for testing time_t types other than the system's. 4557 Run 'make check_time_t_alternatives' to try this out. 4558 Currently, the tests fail for unsigned time_t; 4559 this should get fixed at some point. 4560 4561 Changes affecting documentation and commentary: 4562 4563 Deemphasize the significance of national borders. 4564 4565 Update the zdump man page. 4566 4567 Remove obsolete NOID comment (thanks to Denis Excoffier). 4568 4569 Update several URLs and comments in the web pages. 4570 4571 Spelling fixes (thanks to Kevin Lyda and Jonathan Leffler). 4572 4573 Update URL for CLDR Zone->Tzid table (thanks to Yoshito Umaoka). 4574 4575 4576 Release 2013c - 2013-04-19 16:17:40 -0700 4577 4578 Changes affecting current and future timestamps: 4579 4580 Palestine observed DST starting March 29, 2013. (Thanks to 4581 Steffen Thorsen.) From 2013 on, Gaza and Hebron both observe DST, 4582 with the predicted rules being the last Thursday in March at 24:00 4583 to the first Friday on or after September 21 at 01:00. 4584 4585 Assume that the recent change to Paraguay's DST rules is permanent, 4586 by moving the end of DST to the 4th Sunday in March every year. 4587 (Thanks to Carlos Ral Perasso.) 4588 4589 Changes affecting past timestamps: 4590 4591 Fix some historical data for Palestine to agree with that of 4592 timeanddate.com, as follows: 4593 4594 The spring 2008 change in Gaza and Hebron was on 00:00 Mar 28, not 4595 00:00 Apr 1. 4596 4597 The fall 2009 change in Gaza and Hebron on Sep 4 was at 01:00, not 4598 02:00. 4599 4600 The spring 2010 change in Hebron was 00:00 Mar 26, not 00:01 Mar 27. 4601 4602 The spring 2011 change in Gaza was 00:01 Apr 1, not 12:01 Apr 2. 4603 4604 The spring 2011 change in Hebron on Apr 1 was at 00:01, not 12:01. 4605 4606 The fall 2011 change in Hebron on Sep 30 was at 00:00, not 03:00. 4607 4608 Fix times of habitation for Macquarie to agree with the Tasmania 4609 Parks & Wildlife Service history, which indicates that permanent 4610 habitation was 1899-1919 and 1948 on. 4611 4612 Changing affecting metadata only: 4613 4614 Macquarie Island is politically part of Australia, not Antarctica. 4615 (Thanks to Tobias Conradi.) 4616 4617 Sort Macquarie more consistently with other parts of Australia. 4618 (Thanks to Tim Parenti.) 4619 4620 4621 Release 2013b - 2013-03-10 22:33:40 -0700 4622 4623 Changes affecting current and future timestamps: 4624 4625 Haiti uses US daylight-saving rules this year, and presumably future years. 4626 This changes timestamps starting today. (Thanks to Steffen Thorsen.) 4627 4628 Paraguay will end DST on March 24 this year. 4629 (Thanks to Steffen Thorsen.) For now, assume it's just this year. 4630 4631 Morocco does not observe DST during Ramadan; 4632 try to predict Ramadan in Morocco as best we can. 4633 (Thanks to Erik Homoet for the heads-up.) 4634 4635 Changes affecting commentary: 4636 4637 Update URLs in tz-link page. Add URLs for webOS, BB10, iOS. 4638 Update URL for Solaris. Mention Internet RFC 6557. 4639 Update Internet RFCs 2445->5545, 2822->5322. 4640 Switch from FTP to HTTP for Internet RFCs. 4641 4642 4643 Release 2013a - 2013-02-27 09:20:35 -0800 4644 4645 Change affecting binary data format: 4646 4647 The zone offset at the end of version-2-format zone files is now 4648 allowed to be 24:00, as per POSIX.1-2008. (Thanks to Arthur David Olson.) 4649 4650 Changes affecting current and future timestamps: 4651 4652 Chile's 2013 rules, and we guess rules for 2014 and later, will be 4653 the same as 2012, namely Apr Sun>=23 03:00 UTC to Sep Sun>=2 04:00 UTC. 4654 (Thanks to Steffen Thorsen and Robert Elz.) 4655 4656 New Zones Asia/Khandyga, Asia/Ust-Nera, Europe/Busingen. 4657 (Thanks to Tobias Conradi and Arthur David Olson.) 4658 4659 Many changes affect historical timestamps before 1940. 4660 These were deduced from: Milne J. Civil time. Geogr J. 1899 4661 Feb;13(2):173-94 <https://www.jstor.org/stable/1774359>. 4662 4663 Changes affecting the code: 4664 4665 Fix zic bug that mishandled Egypt's 2010 changes (this also affected 4666 the data). (Thanks to Arthur David Olson.) 4667 4668 Fix localtime bug when time_t is unsigned and data files were generated 4669 by a signed time_t system. (Thanks to Doug Bailey for reporting and 4670 to Arthur David Olson for fixing.) 4671 4672 Allow the email address for bug reports to be set by the packager. 4673 The default is tz (a] iana.org, as before. (Thanks to Joseph S. Myers.) 4674 4675 Update HTML checking to be compatible with Ubuntu 12.10. 4676 4677 Check that files are a safe subset of ASCII. At some point we may 4678 relax this requirement to a safe subset of UTF-8. Without the 4679 check, some non-UTF-8 encodings were leaking into the distribution. 4680 4681 Commentary changes: 4682 4683 Restore a comment about copyright notices that was inadvertently deleted. 4684 (Thanks to Arthur David Olson.) 4685 4686 Improve the commentary about which districts observe what times 4687 in Russia. (Thanks to Oscar van Vlijmen and Arthur David Olson.) 4688 4689 Add web page links to tz.js. 4690 4691 Add "Run by the Monkeys" to tz-art. (Thanks to Arthur David Olson.) 4692 4693 4694 Release 2012j - 2012-11-12 18:34:49 -0800 4695 4696 Libya moved to CET this weekend, but with DST planned next year. 4697 (Thanks to Even Scharning, Steffen Thorsen, and Tim Parenti.) 4698 4699 Signatures now have the extension .asc, not .sign, as that's more 4700 standard. (Thanks to Phil Pennock.) 4701 4702 The output of 'zdump --version', and of 'zic --version', now 4703 uses a format that is more typical for --version. 4704 (Thanks to Joseph S. Myers.) 4705 4706 The output of 'tzselect --help', 'zdump --help', and 'zic --help' 4707 now uses tz (a] iana.org rather than the old elsie address. 4708 4709 zic -v now complains about abbreviations that are less than 3 4710 or more than 6 characters, as per POSIX. Formerly, it checked 4711 for abbreviations that were more than 3. 4712 4713 'make public' no longer puts its temporary directory under /tmp, 4714 and uses the just-built zic rather than the system zic. 4715 4716 Various fixes to documentation and commentary. 4717 4718 4719 Release 2012i - 2012-11-03 12:57:09 -0700 4720 4721 Cuba switches from DST tomorrow at 01:00. (Thanks to Steffen Thorsen.) 4722 4723 Linker flags can now be specified via LDFLAGS. 4724 AWK now defaults to 'awk', not 'nawk'. 4725 The shell in tzselect now defaults to /bin/bash, but this can 4726 be overridden by specifying KSHELL. 4727 The main web page now mentions the unofficial GitHub repository. 4728 (Thanks to Mike Frysinger.) 4729 4730 Tarball signatures can now be built by running 'make signatures'. 4731 There are also new makefile rules 'tarballs', 'check_public', and 4732 separate makefile rules for each tarball and signature file. 4733 A few makefile rules are now more portable to strict POSIX. 4734 4735 The main web page now lists the canonical IANA URL. 4736 4737 4738 Release 2012h - 2012-10-26 22:49:10 -0700 4739 4740 Bahia no longer has DST. (Thanks to Kelley Cook.) 4741 4742 Tocantins has DST. (Thanks to Rodrigo Severo.) 4743 4744 Israel has new DST rules next year. (Thanks to Ephraim Silverberg.) 4745 4746 Jordan stays on DST this winter. (Thanks to Steffen Thorsen.) 4747 4748 Web page updates. 4749 4750 More C modernization, except that at Arthur David Olson's suggestion 4751 the instances of 'register' were kept. 4752 4753 4754 Release 2012g - 2012-10-17 20:59:45 -0700 4755 4756 Samoa fall 2012 and later. (Thanks to Nicholas Pereira and Robert Elz.) 4757 4758 Palestine fall 2012. (Thanks to Steffen Thorsen.) 4759 4760 Assume C89. 4761 4762 To attack the version-number problem, this release ships the file 4763 'Makefile' (which contains the release number) in both the tzcode and 4764 the tzdata tarballs. The two Makefiles are identical, and should be 4765 identical in any matching pair of tarballs, so it shouldn't matter 4766 which order you extract the tarballs. Perhaps we can come up with a 4767 better version-number scheme at some point; this scheme does have the 4768 virtue of not adding more files. 4769 4770 4771 Release 2012f - 2012-09-12 23:17:03 -0700 4772 4773 * australasia (Pacific/Fiji): Fiji DST is October 21 through January 4774 20 this year. (Thanks to Steffen Thorsen.) 4775 4776 4777 Release 2012e - 2012-08-02 20:44:55 -0700 4778 4779 * australasia (Pacific/Fakaofo): Tokelau is UT +13, not +14. 4780 (Thanks to Steffen Thorsen.) 4781 4782 * Use a single version number for both code and data. 4783 4784 * .gitignore: New file. 4785 4786 * Remove trailing white space. 4787 4788 4789 Release code2012c-data2012d - 2012-07-19 16:35:33 -0700 4790 4791 Changes for Morocco's timestamps, which take effect in a couple of 4792 hours, along with infrastructure changes to accommodate how the tz 4793 code and data are released on IANA. 4794 4795 4796 Release data2012c - 2012-03-27 12:17:25 -0400 4797 4798 africa 4799 Summer time changes for Morocco (to start late April 2012) 4800 4801 asia 4802 Changes for 2012 for Gaza & the West Bank (Hebron) and Syria 4803 4804 northamerica 4805 Haiti following US/Canada rules for 2012 (and we're assuming, 4806 for now anyway, for the future). 4807 4808 4809 Release 2012b - 2012-03-02 12:29:15 +0700 4810 4811 There is just one change to tzcode2012b (compared with 2012a): 4812 the Makefile that was accidentally included with 2012a has been 4813 replaced with the version that should have been there, which is 4814 identical with the previous version (from tzcode2011i). 4815 4816 There are just two changes in tzdata2012b compared with 2012a. 4817 4818 Most significantly, summer time in Cuba has been delayed 3 weeks 4819 (now starts April 1 rather than March 11). Since Mar 11 (the old start 4820 date, as listed in 2012a) is just a little over a week away, this 4821 change is urgent. 4822 4823 Less importantly, an excess tab in one of the changes in zone.tab 4824 in 2012a has been removed. 4825 4826 4827 Release 2012a - 2012-03-01 18:28:10 +0700 4828 4829 The changes in tzcode2012a (compared to the previous version, 2011i) 4830 are entirely to the README and tz-art.htm and tz-link.htm files, if 4831 none of those concern you, you can ignore the code update. The changes 4832 reflect the changed addresses for the mailing list and the code and 4833 data distribution points & methods (and a link to DateTime::TimeZone::Tzfile 4834 has been added to tz-link.htm). 4835 4836 In tzdata2012a (compared to the previous release, which was 2011n) 4837 the major changes are: 4838 Chile 2011/2012 and 2012/2013 summer time date adjustments. 4839 Falkland Islands onto permanent summer time (we're assuming for the 4840 foreseeable future, though 2012 is all we're fairly certain of.) 4841 Armenia has abolished Summer Time. 4842 Tokelau jumped the International Date Line back last December 4843 (just the same as their near neighbour, Samoa). 4844 America/Creston is a new zone for a small area of British Columbia 4845 There will be a leapsecond 2012-06-30 23:59:60 UTC. 4846 4847 Other minor changes are: 4848 Corrections to 1918 Canadian summer time end dates. 4849 Updated URL for UK time zone history (in comments) 4850 A few typos in Le Corre's list of free French place names (comments) 4851 4852 4853 Release data2011n - 2011-10-30 14:57:54 +0700 4854 4855 There are three changes of note - most urgently, Cuba (America/Havana) 4856 has extended summer time by two weeks, now to end on Nov 13, rather than 4857 the (already past) Oct 30. Second, the Pridnestrovian Moldavian Republic 4858 (Europe/Tiraspol) decided not to split from the rest of Moldova after 4859 all, and consequently that zone has been removed (again) and reinstated 4860 in the "backward" file as a link to Europe/Chisinau. And third, the 4861 end date for Fiji's summer time this summer was moved forward from the 4862 earlier planned Feb 26, to Jan 22. 4863 4864 Apart from that, Moldova (MD) returns to a single entry in zone.tab 4865 (and the incorrect syntax that was in the 2011m version of that file 4866 is so fixed - it would have been fixed in a different way had this 4867 change not happened - that's the "missing" sccs version id). 4868 4869 4870 Release data2011m - 2011-10-24 21:42:16 +0700 4871 4872 In particular, the typos in comments in the data (2011-11-17 should have 4873 been 2011-10-17 as Alan Barrett noted, and spelling of Tiraspol that 4874 Tim Parenti noted) have been fixed, and the change for Ukraine has been 4875 made in all 4 Ukrainian zones, rather than just Europe/Kiev 4876 (again, thanks to Tim Parenti, and also Denys Gavrysh). 4877 4878 In addition, I added Europe/Tiraspol to zone.tab. 4879 4880 This time, all the files have new version numbers... (including the files 4881 otherwise unchanged in 2011m that were changed in 2011l but didn't get new 4882 version numbers there...) 4883 4884 4885 Release data2011l - 2011-10-10 11:15:43 +0700 4886 4887 There are just 2 changes that cause different generated tzdata files from 4888 zic, to Asia/Hebron and Pacific/Fiji - the possible change for Bahia, Brazil 4889 is included, but commented out. Compared with the diff I sent out last week, 4890 this version also includes attributions for the sources for the changes 4891 (in much the same format as ado used, but the html tags have not been 4892 checked, verified, or used in any way at all, so if there are errors there, 4893 please let me know.) 4894 4895 4896 Release data2011k - 2011-09-20 17:54:03 -0400 4897 4898 [not summarized] 4899 4900 4901 Release data2011j - 2011-09-12 09:22:49 -0400 4902 4903 (contemporary changes for Samoa; past changes for Kenya, Uganda, and 4904 Tanzania); there are also two spelling corrections to comments in 4905 the australasia file (with thanks to Christos Zoulas). 4906 4907 4908 Release 2011i - 2011-08-29 05:56:32 -0400 4909 4910 [not summarized] 4911 4912 4913 Release data2011h - 2011-06-15 18:41:48 -0400 4914 4915 Russia and Curaao changes 4916 4917 4918 Release 2011g - 2011-04-25 09:07:22 -0400 4919 4920 update the rules for Egypt to reflect its abandonment of DST this year 4921 4922 4923 Release 2011f - 2011-04-06 17:14:53 -0400 4924 4925 [not summarized] 4926 4927 4928 Release 2011e - 2011-03-31 16:04:38 -0400 4929 4930 Morocco, Chile, and tz-link changes 4931 4932 4933 Release 2011d - 2011-03-14 09:18:01 -0400 4934 4935 changes that impact present-day timestamps in Cuba, Samoa, and Turkey 4936 4937 4938 Release 2011c - 2011-03-07 09:30:09 -0500 4939 4940 These do affect current timestamps in Chile and Annette Island, Canada. 4941 4942 4943 Release 2011b - 2011-02-07 08:44:50 -0500 4944 4945 [not summarized] 4946 4947 4948 Release 2011a - 2011-01-24 10:30:16 -0500 4949 4950 [not summarized] 4951 4952 4953 Release data2010o - 2010-11-01 09:18:23 -0400 4954 4955 change to the end of DST in Fiji in 2011 4956 4957 4958 Release 2010n - 2010-10-25 08:19:17 -0400 4959 4960 [not summarized] 4961 4962 4963 Release 2010m - 2010-09-27 09:24:48 -0400 4964 4965 Hong Kong, Vostok, and zic.c changes 4966 4967 4968 Release 2010l - 2010-08-16 06:57:25 -0400 4969 4970 [not summarized] 4971 4972 4973 Release 2010k - 2010-07-26 10:42:27 -0400 4974 4975 [not summarized] 4976 4977 4978 Release 2010j - 2010-05-10 09:07:48 -0400 4979 4980 changes for Baha de Banderas and for version naming 4981 4982 4983 Release data2010i - 2010-04-16 18:50:45 -0400 4984 4985 the end of DST in Morocco on 2010-08-08 4986 4987 4988 Release data2010h - 2010-04-05 09:58:56 -0400 4989 4990 [not summarized] 4991 4992 4993 Release data2010g - 2010-03-24 11:14:53 -0400 4994 4995 [not summarized] 4996 4997 4998 Release 2010f - 2010-03-22 09:45:46 -0400 4999 5000 [not summarized] 5001 5002 5003 Release data2010e - 2010-03-08 14:24:27 -0500 5004 5005 corrects the Dhaka bug found by Danvin Ruangchan 5006 5007 5008 Release data2010d - 2010-03-06 07:26:01 -0500 5009 5010 [not summarized] 5011 5012 5013 Release 2010c - 2010-03-01 09:20:58 -0500 5014 5015 changes including KRE's suggestion for earlier initialization of 5016 "goahead" and "goback" structure elements 5017 5018 5019 Release code2010a - 2010-02-16 10:40:04 -0500 5020 5021 [not summarized] 5022 5023 5024 Release data2010b - 2010-01-20 12:37:01 -0500 5025 5026 Mexico changes 5027 5028 5029 Release data2010a - 2010-01-18 08:30:04 -0500 5030 5031 changes to Dhaka 5032 5033 5034 Release data2009u - 2009-12-26 08:32:28 -0500 5035 5036 changes to DST in Bangladesh 5037 5038 5039 Release 2009t - 2009-12-21 13:24:27 -0500 5040 5041 [not summarized] 5042 5043 5044 Release data2009s - 2009-11-14 10:26:32 -0500 5045 5046 (cosmetic) Antarctica change and the DST-in-Fiji-in-2009-and-2010 change 5047 5048 5049 Release 2009r - 2009-11-09 10:10:31 -0500 5050 5051 "antarctica" and "tz-link.htm" changes 5052 5053 5054 Release 2009q - 2009-11-02 09:12:40 -0500 5055 5056 with two corrections as reported by Eric Muller and Philip Newton 5057 5058 5059 Release data2009p - 2009-10-23 15:05:27 -0400 5060 5061 Argentina (including San Luis) changes (with the correction from 5062 Mariano Absatz) 5063 5064 5065 Release data2009o - 2009-10-14 16:49:38 -0400 5066 5067 Samoa (commentary only), Pakistan, and Bangladesh changes 5068 5069 5070 Release data2009n - 2009-09-22 15:13:38 -0400 5071 5072 added commentary for Argentina and a change to the end of DST in 5073 2009 in Pakistan 5074 5075 5076 Release data2009m - 2009-09-03 10:23:43 -0400 5077 5078 Samoa and Palestine changes 5079 5080 5081 Release data2009l - 2009-08-14 09:13:07 -0400 5082 5083 Samoa (comments only) and Egypt 5084 5085 5086 Release 2009k - 2009-07-20 09:46:08 -0400 5087 5088 [not summarized] 5089 5090 5091 Release data2009j - 2009-06-15 06:43:59 -0400 5092 5093 Bangladesh change (with a short turnaround since the DST change is 5094 impending) 5095 5096 5097 Release 2009i - 2009-06-08 09:21:22 -0400 5098 5099 updating for DST in Bangladesh this year 5100 5101 5102 Release 2009h - 2009-05-26 09:19:14 -0400 5103 5104 [not summarized] 5105 5106 5107 Release data2009g - 2009-04-20 16:34:07 -0400 5108 5109 Cairo 5110 5111 5112 Release data2009f - 2009-04-10 11:00:52 -0400 5113 5114 correct DST in Pakistan 5115 5116 5117 Release 2009e - 2009-04-06 09:08:11 -0400 5118 5119 [not summarized] 5120 5121 5122 Release 2009d - 2009-03-23 09:38:12 -0400 5123 5124 Morocco, Tunisia, Argentina, and American Astronomical Society changes 5125 5126 5127 Release data2009c - 2009-03-16 09:47:51 -0400 5128 5129 change to the start of Cuban DST 5130 5131 5132 Release 2009b - 2009-02-09 11:15:22 -0500 5133 5134 [not summarized] 5135 5136 5137 Release 2009a - 2009-01-21 10:09:39 -0500 5138 5139 [not summarized] 5140 5141 5142 Release data2008i - 2008-10-21 12:10:25 -0400 5143 5144 southamerica and zone.tab files, with Argentina DST rule changes and 5145 United States zone reordering and recommenting 5146 5147 5148 Release 2008h - 2008-10-13 07:33:56 -0400 5149 5150 [not summarized] 5151 5152 5153 Release 2008g - 2008-10-06 09:03:18 -0400 5154 5155 Fix a broken HTML anchor and update Brazil's DST transitions; 5156 there's also a slight reordering of information in tz-art.htm. 5157 5158 5159 Release data2008f - 2008-09-09 22:33:26 -0400 5160 5161 [not summarized] 5162 5163 5164 Release 2008e - 2008-07-28 14:11:17 -0400 5165 5166 changes by Arthur David Olson and Jesper Nrgaard Welen 5167 5168 5169 Release data2008d - 2008-07-07 09:51:38 -0400 5170 5171 changes by Arthur David Olson, Paul Eggert, and Rodrigo Severo 5172 5173 5174 Release data2008c - 2008-05-19 17:48:03 -0400 5175 5176 Pakistan, Morocco, and Mongolia 5177 5178 5179 Release data2008b - 2008-03-24 08:30:59 -0400 5180 5181 including renaming Asia/Calcutta to Asia/Kolkata, with a backward 5182 link provided 5183 5184 5185 Release 2008a - 2008-03-08 05:42:16 -0500 5186 5187 [not summarized] 5188 5189 5190 Release 2007k - 2007-12-31 10:25:22 -0500 5191 5192 most importantly, changes to the "southamerica" file based on 5193 Argentina's readoption of daylight saving time 5194 5195 5196 Release 2007j - 2007-12-03 09:51:01 -0500 5197 5198 1. eliminate the "P" (parameter) macro; 5199 5200 2. the "noncontroversial" changes circulated on the time zone 5201 mailing list (less the changes to "logwtmp.c"); 5202 5203 3. eliminate "too many transition" errors when "min" is used in time 5204 zone rules; 5205 5206 4. changes by Paul Eggert (including updated information for Venezuela). 5207 5208 5209 Release data2007i - 2007-10-30 10:28:11 -0400 5210 5211 changes for Cuba and Syria 5212 5213 5214 Release 2007h - 2007-10-01 10:05:51 -0400 5215 5216 changes by Paul Eggert, as well as an updated link to the ICU 5217 project in tz-link.htm 5218 5219 5220 Release 2007g - 2007-08-20 10:47:59 -0400 5221 5222 changes by Paul Eggert 5223 5224 The "leapseconds" file has been updated to incorporate the most 5225 recent International Earth Rotation and Reference Systems Service 5226 (IERS) bulletin. 5227 5228 There's an addition to tz-art.htm regarding the television show "Medium". 5229 5230 5231 Release 2007f - 2007-05-07 10:46:46 -0400 5232 5233 changes by Paul Eggert (including Haiti, Turks and Caicos, and New 5234 Zealand) 5235 5236 changes to zic.c to allow hour values greater than 24 (along with 5237 Paul's improved time value overflow checking) 5238 5239 5240 Release 2007e - 2007-04-02 10:11:52 -0400 5241 5242 Syria and Honduras changes by Paul Eggert 5243 5244 zic.c variable renaming changes by Arthur David Olson 5245 5246 5247 Release 2007d - 2007-03-20 08:48:30 -0400 5248 5249 changes by Paul Eggert 5250 5251 the elimination of white space at the ends of lines 5252 5253 5254 Release 2007c - 2007-02-26 09:09:37 -0500 5255 5256 changes by Paul Eggert 5257 5258 5259 Release 2007b - 2007-02-12 09:34:20 -0500 5260 5261 Paul Eggert's proposed change to the quotation handling logic in zic.c. 5262 5263 changes to the commentary in "leapseconds" reflecting the IERS 5264 announcement that there is to be no positive leap second at the end 5265 of June 2007. 5266 5267 5268 Release 2007a - 2007-01-08 12:28:29 -0500 5269 5270 changes by Paul Eggert 5271 5272 Derick Rethans's Asmara change 5273 5274 Oscar van Vlijmen's Easter Island local mean time change 5275 5276 symbolic link changes 5277 5278 5279 Release 2006p - 2006-11-27 08:54:27 -0500 5280 5281 changes by Paul Eggert 5282 5283 5284 Release 2006o - 2006-11-06 09:18:07 -0500 5285 5286 changes by Paul Eggert 5287 5288 5289 Release 2006n - 2006-10-10 11:32:06 -0400 5290 5291 changes by Paul Eggert 5292 5293 5294 Release 2006m - 2006-10-02 15:32:35 -0400 5295 5296 changes for Uruguay, Palestine, and Egypt by Paul Eggert 5297 5298 (minimalist) changes to zic.8 to clarify "until" information 5299 5300 5301 Release data2006l - 2006-09-18 12:58:11 -0400 5302 5303 Paul's best-effort work on this coming weekend's Egypt time change 5304 5305 5306 Release 2006k - 2006-08-28 12:19:09 -0400 5307 5308 changes by Paul Eggert 5309 5310 5311 Release 2006j - 2006-08-21 09:56:32 -0400 5312 5313 changes by Paul Eggert 5314 5315 5316 Release code2006i - 2006-08-07 12:30:55 -0400 5317 5318 localtime.c fixes 5319 5320 Ken Pizzini's conversion script 5321 5322 5323 Release code2006h - 2006-07-24 09:19:37 -0400 5324 5325 adds public domain notices to four files 5326 5327 includes a fix for transition times being off by a second 5328 5329 adds a new recording to the "arts" file (information courtesy Colin Bowern) 5330 5331 5332 Release 2006g - 2006-05-08 17:18:09 -0400 5333 5334 northamerica changes by Paul Eggert 5335 5336 5337 Release 2006f - 2006-05-01 11:46:00 -0400 5338 5339 a missing version number problem is fixed (with thanks to Bradley 5340 White for catching the problem) 5341 5342 5343 Release 2006d - 2006-04-17 14:33:43 -0400 5344 5345 changes by Paul Eggert 5346 5347 added new items to tz-arts.htm that were found by Paul 5348 5349 5350 Release 2006c - 2006-04-03 10:09:32 -0400 5351 5352 two sets of data changes by Paul Eggert 5353 5354 a fencepost error fix in zic.c 5355 5356 changes to zic.c and the "europe" file to minimize differences 5357 between output produced by the old 32-bit zic and the new 64-bit 5358 version 5359 5360 5361 Release 2006b - 2006-02-20 10:08:18 -0500 5362 [tz32code2006b + tz64code2006b + tzdata2006b] 5363 5364 64-bit code 5365 5366 All SCCS IDs were bumped to "8.1" for this release. 5367 5368 5369 Release 2006a - 2006-01-30 08:59:31 -0500 5370 5371 changes by Paul Eggert (in particular, Indiana time zone moves) 5372 5373 an addition to the zic manual page to describe how special-case 5374 transitions are handled 5375 5376 5377 Release 2005r - 2005-12-27 09:27:13 -0500 5378 5379 Canadian changes by Paul Eggert 5380 5381 They also add "<pre>" directives to time zone data files and reflect 5382 changes to warning message logic in "zdump.c" (but with calls to 5383 "gettext" kept unbundled at the suggestion of Ken Pizzini). 5384 5385 5386 Release 2005q - 2005-12-13 09:17:09 -0500 5387 5388 Nothing earth-shaking here: 5389 1. Electronic mail addresses have been removed. 5390 2. Casts of the return value of exit have been removed. 5391 3. Casts of the argument of is.* macros have been added. 5392 4. Indentation in one section of zic.c has been fixed. 5393 5. References to dead URLs in the data files have been dealt with. 5394 5395 5396 Release 2005p - 2005-12-05 10:30:53 -0500 5397 5398 "systemv", "tz-link.htm", and "zdump.c" changes 5399 (less the casts of arguments to the is* macros) 5400 5401 5402 Release 2005o - 2005-11-28 10:55:26 -0500 5403 5404 Georgia, Cuba, Nicaragua, and Jordan changes by Paul Eggert 5405 5406 zdump.c lint fixes by Arthur David Olson 5407 5408 5409 Release 2005n - 2005-10-03 09:44:09 -0400 5410 5411 changes by Paul Eggert (both the Uruguay changes and the Kyrgyzstan 5412 et al. changes) 5413 5414 5415 Release 2005m - 2005-08-29 12:15:40 -0400 5416 5417 changes by Paul Eggert (with a small tweak to the tz-art change) 5418 5419 a declaration of an unused variable has been removed from zdump.c 5420 5421 5422 Release 2005l - 2005-08-22 12:06:39 -0400 5423 5424 changes by Paul Eggert 5425 5426 overflow/underflow checks by Arthur David Olson, minus changes to 5427 the "Theory" file about the pending addition of 64-bit data (I grow 5428 less confident of the changes being accepted with each passing day, 5429 and the changes no longer increase the data files nine-fold--there's 5430 less than a doubling in size by my local Sun's reckoning) 5431 5432 5433 Release 2005k - 2005-07-14 14:14:24 -0400 5434 5435 The "leapseconds" file has been edited to reflect the recently 5436 announced leap second at the end of 2005. 5437 5438 I've also deleted electronic mail addresses from the files as an 5439 anti-spam measure. 5440 5441 5442 Release 2005j - 2005-06-13 14:34:13 -0400 5443 5444 These reflect changes to limit the length of time zone abbreviations 5445 and the characters used in those abbreviations. 5446 5447 There are also changes to handle POSIX-style "quoted" timezone 5448 environment variables. 5449 5450 The changes were circulated on the time zone mailing list; the only 5451 change since then was the removal of a couple of minimum-length of 5452 abbreviation checks. 5453 5454 5455 Release data2005i - 2005-04-21 15:04:16 -0400 5456 5457 changes (most importantly to Nicaragua and Haiti) by Paul Eggert 5458 5459 5460 Release 2005h - 2005-04-04 11:24:47 -0400 5461 5462 changes by Paul Eggert 5463 5464 minor changes to Makefile and zdump.c to produce more useful output 5465 when doing a "make typecheck" 5466 5467 5468 Release 2005g - 2005-03-14 10:11:21 -0500 5469 5470 changes by Paul Eggert (a change to current DST rules in Uruguay and 5471 an update to a link to time zone software) 5472 5473 5474 Release 2005f - 2005-03-01 08:45:32 -0500 5475 5476 data and documentation changes by Paul Eggert 5477 5478 5479 Release 2005e - 2005-02-10 15:59:44 -0500 5480 5481 [not summarized] 5482 5483 5484 Release code2005d - 2005-01-31 09:21:47 -0500 5485 5486 make zic complain about links to links if the -v flag is used 5487 5488 have "make public" do more code checking 5489 5490 add an include to "localtime.c" for the benefit of gcc systems 5491 5492 5493 Release 2005c - 2005-01-17 18:36:29 -0500 5494 5495 get better results when mktime runs on a system where time_t is double 5496 5497 changes to the data files (most importantly to Paraguay) 5498 5499 5500 Release 2005b - 2005-01-10 09:19:54 -0500 5501 5502 Get localtime and gmtime working on systems with exotic time_t types. 5503 5504 Update the leap second commentary in the "leapseconds" file. 5505 5506 5507 Release 2005a - 2005-01-01 13:13:44 -0500 5508 5509 [not summarized] 5510 5511 5512 Release code2004i - 2004-12-14 13:42:58 -0500 5513 5514 Deal with systems where time_t is unsigned. 5515 5516 5517 Release code2004h - 2004-12-07 11:40:18 -0500 5518 5519 64-bit-time_t changes 5520 5521 5522 Release 2004g - 2004-11-02 09:06:01 -0500 5523 5524 update to Cuba (taking effect this weekend) 5525 5526 other changes by Paul Eggert 5527 5528 correction of the spelling of Oslo 5529 5530 changed versions of difftime.c and private.h 5531 5532 5533 Release code2004f - 2004-10-21 10:25:22 -0400 5534 5535 Cope with wide-ranging tm_year values. 5536 5537 5538 Release 2004e - 2004-10-11 14:47:21 -0400 5539 5540 Brazil/Argentina/Israel changes by Paul Eggert 5541 5542 changes to tz-link.htm by Paul 5543 5544 one small fix to Makefile 5545 5546 5547 Release 2004d - 2004-09-22 08:27:29 -0400 5548 5549 Avoid overflow problems when TM_YEAR_BASE is added to an integer. 5550 5551 5552 Release 2004c - 2004-08-11 12:06:26 -0400 5553 5554 asctime-related changes 5555 5556 (variants of) some of the documentation changes suggested by Paul Eggert 5557 5558 5559 Release 2004b - 2004-07-19 14:33:35 -0400 5560 5561 data changes by Paul Eggert - most importantly, updates for Argentina 5562 5563 5564 Release 2004a - 2004-05-27 12:00:47 -0400 5565 5566 changes by Paul Eggert 5567 5568 Handle DST transitions that occur at the end of a month in some 5569 years but at the start of the following month in other years. 5570 5571 Add a copy of the correspondence that's the basis for claims about 5572 DST in the Navajo Nation. 5573 5574 5575 Release 2003e - 2003-12-15 09:36:47 -0500 5576 5577 changes by Arthur David Olson (primarily code changes) 5578 5579 changes by Paul Eggert (primarily data changes) 5580 5581 minor changes to "Makefile" and "northamerica" (in the latter case, 5582 optimization of the "Toronto" rules) 5583 5584 5585 Release 2003d - 2003-10-06 09:34:44 -0400 5586 5587 changes by Paul Eggert 5588 5589 5590 Release 2003c - 2003-09-16 10:47:05 -0400 5591 5592 Fix bad returns in zic.c's inleap function. 5593 Thanks to Bradley White for catching the problem! 5594 5595 5596 Release 2003b - 2003-09-16 07:13:44 -0400 5597 5598 Add a "--version" option (and documentation) to the zic and zdump commands. 5599 5600 changes to overflow/underflow checking in zic 5601 5602 a localtime typo fix. 5603 5604 Update the leapseconds and tz-art.htm files. 5605 5606 5607 Release 2003a - 2003-03-24 09:30:54 -0500 5608 5609 changes by Paul Eggert 5610 5611 a few additions and modifications to the tz-art.htm file 5612 5613 5614 Release 2002d - 2002-10-15 13:12:42 -0400 5615 5616 changes by Paul Eggert, less the "Britain (UK)" change in iso3166.tab 5617 5618 There's also a new time zone quote in "tz-art.htm". 5619 5620 5621 Release 2002c - 2002-04-04 11:55:20 -0500 5622 5623 changes by Paul Eggert 5624 5625 Change zic.c to avoid creating symlinks to files that don't exist. 5626 5627 5628 Release 2002b - 2002-01-28 12:56:03 -0500 5629 5630 [These change notes are for Release 2002a, which was corrupted. 5631 2002b was a corrected version of 2002a.] 5632 5633 changes by Paul Eggert 5634 5635 Update the "leapseconds" file to note that there'll be no leap 5636 second at the end of June, 2002. 5637 5638 Change "zic.c" to deal with a problem in handling the "Asia/Bishkek" zone. 5639 5640 Change to "difftime.c" to avoid sizeof problems. 5641 5642 5643 Release 2001d - 2001-10-09 13:31:32 -0400 5644 5645 changes by Paul Eggert 5646 5647 5648 Release 2001c - 2001-06-05 13:59:55 -0400 5649 5650 changes by Paul Eggert and Andrew Brown 5651 5652 5653 Release 2001b - 2001-04-05 16:44:38 -0400 5654 5655 changes by Paul Eggert (modulo jnorgard's typo fix) 5656 5657 tz-art.htm has been HTMLified. 5658 5659 5660 Release 2001a - 2001-03-13 12:57:44 -0500 5661 5662 changes by Paul Eggert 5663 5664 An addition to the "leapseconds" file: comments with the text of the 5665 latest IERS leap second notice. 5666 5667 Trailing white space has been removed from data file lines, and 5668 repeated spaces in "Rule Jordan" lines in the "asia" file have been 5669 converted to tabs. 5670 5671 5672 Release 2000h - 2000-12-14 15:33:38 -0500 5673 5674 changes by Paul Eggert 5675 5676 one typo fix in the "art" file 5677 5678 With providence, this is the last update of the millennium. 5679 5680 5681 Release 2000g - 2000-10-10 11:35:22 -0400 5682 5683 changes by Paul Eggert 5684 5685 correction of John Mackin's name submitted by Robert Elz 5686 5687 Garry Shandling's Daylight Saving Time joke (!?!) from the recent 5688 Emmy Awards broadcast. 5689 5690 5691 Release 2000f - 2000-08-10 09:31:58 -0400 5692 5693 changes by Paul Eggert 5694 5695 Added information in "tz-art.htm" on a Seinfeld reference to DST. 5696 5697 Error checking and messages in the "yearistype" script have been 5698 improved. 5699 5700 5701 Release 2000e - 2000-07-31 09:27:54 -0400 5702 5703 data changes by Paul Eggert 5704 5705 a change to the default value of the defined constant HAVE_STRERROR 5706 5707 the addition of a Dave Barry quote on DST to the tz-arts file 5708 5709 5710 Release 2000d - 2000-04-20 15:43:04 -0400 5711 5712 changes to the documentation and code of strftime for C99 conformance 5713 5714 a bug fix for date.c 5715 5716 These are based on (though modified from) changes by Paul Eggert. 5717 5718 5719 Release 2000c - 2000-03-04 10:31:43 -0500 5720 5721 changes by Paul Eggert 5722 5723 5724 Release 2000b - 2000-02-21 12:16:29 -0500 5725 5726 changes by Paul Eggert and Joseph Myers 5727 5728 modest tweaks to the tz-art.htm and tz-link.htm files 5729 5730 5731 Release 2000a - 2000-01-18 09:21:26 -0500 5732 5733 changes by Paul Eggert 5734 5735 The two hypertext documents have also been renamed. 5736 5737 5738 Release code1999i-data1999j - 1999-11-15 18:43:22 -0500 5739 5740 Paul Eggert's changes 5741 5742 additions to the "zic" manual page and the "Arts.htm" file 5743 5744 5745 Release code1999h-data1999i - 1999-11-08 14:55:21 -0500 5746 5747 [not summarized] 5748 5749 5750 Release data1999h - 1999-10-07 03:50:29 -0400 5751 5752 changes by Paul Eggert to "europe" (most importantly, fixing 5753 Lithuania and Estonia) 5754 5755 5756 Release 1999g - 1999-09-28 11:06:18 -0400 5757 5758 data changes by Paul Eggert (most importantly, the change for 5759 Lebanon that buys correctness for this coming Sunday) 5760 5761 The "code" file contains changes to "Makefile" and "checktab.awk" to 5762 allow better checking of time zone files before they are published. 5763 5764 5765 Release 1999f - 1999-09-23 09:48:14 -0400 5766 5767 changes by Arthur David Olson and Paul Eggert 5768 5769 5770 Release 1999e - 1999-08-17 15:20:54 -0400 5771 5772 changes circulated by Paul Eggert, although the change to handling 5773 of DST-specifying timezone names has been commented out for now 5774 (search for "XXX" in "localtime.c" for details). These files also 5775 do not make any changes to the start of DST in Brazil. 5776 5777 In addition to Paul's changes, there are updates to "Arts.htm" and 5778 cleanups of URLs. 5779 5780 5781 Release 1999d - 1999-03-30 11:31:07 -0500 5782 5783 changes by Paul Eggert 5784 5785 The Makefile's "make public" rule has also been changed to do a test 5786 compile of each individual time zone data file (which should help 5787 avoid problems such as the one we had with Nicosia). 5788 5789 5790 Release 1999c - 1999-03-25 09:47:47 -0500 5791 5792 changes by Paul Eggert, most importantly the change for Chile. 5793 5794 5795 Release 1999b - 1999-02-01 17:51:44 -0500 5796 5797 changes by Paul Eggert 5798 5799 code changes (suggested by Mani Varadarajan, mani at be.com) for 5800 correct handling of symbolic links when building using a relative directory 5801 5802 code changes to generate correct messages for failed links 5803 5804 updates to the URLs in Arts.htm 5805 5806 5807 Release 1999a - 1999-01-19 16:20:29 -0500 5808 5809 error message internationalizations and corrections in zic.c and 5810 zdump.c (as suggested by Vladimir Michl, vladimir.michl at upol.cz, 5811 to whom thanks!) 5812 5813 5814 Release code1998h-data1998i - 1998-10-01 09:56:10 -0400 5815 5816 changes for Brazil, Chile, and Germany 5817 5818 support for use of "24:00" in the input files for the time zone compiler 5819 5820 5821 Release code1998g-data1998h - 1998-09-24 10:50:28 -0400 5822 5823 changes by Paul Eggert 5824 5825 correction to a define in the "private.h" file 5826 5827 5828 Release data1998g - 1998-08-11 03:28:35 -0000 5829 [tzdata1998g.tar.gz is missing!] 5830 5831 Lithuanian change provided by mgedmin at pub.osf.it 5832 5833 Move creation of the GMT link with Etc/GMT to "etcetera" (from 5834 "backward") to ensure that the GMT file is created even where folks 5835 don't want the "backward" links (as suggested by Paul Eggert). 5836 5837 5838 Release data1998f - 1998-07-20 13:50:00 -0000 5839 [tzdata1998f.tar.gz is missing!] 5840 5841 Update the "leapseconds" file to include the newly announced 5842 insertion at the end of 1998. 5843 5844 5845 Release code1998f - 1998-06-01 10:18:31 -0400 5846 5847 addition to localtime.c by Guy Harris 5848 5849 5850 Release 1998e - 1998-05-28 09:56:26 -0400 5851 5852 The Makefile is changed to produce zoneinfo-posix rather than 5853 zoneinfo/posix, and to produce zoneinfo-leaps rather than 5854 zoneinfo/right. 5855 5856 data changes by Paul Eggert 5857 5858 changes from Guy Harris to provide asctime_r and ctime_r 5859 5860 A usno1998 file (substantially identical to usno1997) has been added. 5861 5862 5863 Release 1998d - 1998-05-14 11:58:34 -0400 5864 5865 changes to comments (in particular, elimination of references to CIA maps). 5866 "Arts.htm", "WWW.htm", "asia", and "australasia" are the only places 5867 where changes occur. 5868 5869 5870 Release 1998c - 1998-02-28 12:32:26 -0500 5871 5872 changes by Paul Eggert (save the "French correction," on which I'll 5873 wait for the dust to settle) 5874 5875 symlink changes 5876 5877 changes and additions to Arts.htm 5878 5879 5880 Release 1998b - 1998-01-17 14:31:51 -0500 5881 5882 URL cleanups and additions 5883 5884 5885 Release 1998a - 1998-01-13 12:37:35 -0500 5886 5887 changes by Paul Eggert 5888 5889 5890 Release code1997i-data1997k - 1997-12-29 09:53:41 -0500 5891 5892 changes by Paul Eggert, with minor modifications from Arthur David 5893 Olson to make the files more browser friendly 5894 5895 5896 Release code1997h-data1997j - 1997-12-18 17:47:35 -0500 5897 5898 minor changes to put "TZif" at the start of each timezone information file 5899 5900 a rule has also been added to the Makefile so you can 5901 make zones 5902 to just recompile the zone information files (rather than doing a 5903 full "make install" with its other effects). 5904 5905 5906 Release data1997i - 1997-10-07 08:45:38 -0400 5907 5908 changes to Africa by Paul Eggert 5909 5910 5911 Release code1997g-data1997h - 1997-09-04 16:56:54 -0400 5912 5913 corrections for Uruguay (and other locations) 5914 5915 Arthur David Olson's simple-minded fix allowing mktime to both 5916 correctly handle leap seconds and correctly handle tm_sec values 5917 upon which arithmetic has been performed. 5918 5919 5920 Release code1997f-data1997g - 1997-07-19 13:15:02 -0400 5921 5922 Paul Eggert's updates 5923 5924 a small change to a function prototype; 5925 5926 "Music" has been renamed "Arts.htm", HTMLified, and augmented to 5927 include information on Around the World in Eighty Days. 5928 5929 5930 Release code1997e-data1997f - 1997-05-03 18:52:34 -0400 5931 5932 fixes to zic's error handling 5933 5934 changes inspired by the item circulated on Slovenia 5935 5936 The description of Web resources has been HTMLified for browsing 5937 convenience. 5938 5939 A new piece of tz-related music has been added to the "Music" file. 5940 5941 5942 Release code1997d-data1997e - 1997-03-29 12:48:52 -0500 5943 5944 Paul Eggert's latest suggestions 5945 5946 5947 Release code1997c-data1997d - 1997-03-07 20:37:54 -0500 5948 5949 changes to "zic.c" to correct performance of the "-s" option 5950 5951 a new file "usno1997" 5952 5953 5954 Release data1997c - 1997-03-04 09:58:18 -0500 5955 5956 changes in Israel 5957 5958 5959 Release 1997b - 1997-02-27 18:34:19 -0500 5960 5961 The data file incorporates the 1997 leap second. 5962 5963 The code file incorporates Arthur David Olson's take on the 5964 zic/multiprocessor/directory-creation situation. 5965 5966 5967 Release 1997a - 1997-01-21 09:11:10 -0500 5968 5969 Paul Eggert's Antarctica (and other changes) 5970 5971 Arthur David Olson finessed the "getopt" issue by checking against 5972 both -1 and EOF (regardless of POSIX, SunOS 4.1.1's manual says -1 5973 is returned while SunOS 5.5's manual says EOF is returned). 5974 5975 5976 Release code1996o-data1996n - 1996-12-27 21:42:05 -0500 5977 5978 Paul Eggert's latest changes 5979 5980 5981 Release code1996n - 1996-12-16 09:42:02 -0500 5982 5983 link snapping fix from Bruce Evans (via Garrett Wollman) 5984 5985 5986 Release data1996m - 1996-11-24 02:37:34 -0000 5987 [tzdata1996m.tar.gz is missing!] 5988 5989 Paul Eggert's batch of changes 5990 5991 5992 Release code1996m-data1996l - 1996-11-05 14:00:12 -0500 5993 5994 No functional changes here; the files have simply been changed to 5995 make more use of ISO style dates in comments. The names of the above 5996 files now include the year in full. 5997 5998 5999 Release code96l - 1996-09-08 17:12:20 -0400 6000 6001 tzcode96k was missing a couple of pieces. 6002 6003 6004 Release 96k - 1996-09-08 16:06:22 -0400 6005 6006 the latest round of changes from Paul Eggert 6007 6008 the recent Year 2000 material 6009 6010 6011 Release code96j - 1996-07-30 13:18:53 -0400 6012 6013 Set sp->typecnt as suggested by Timothy Patrick Murphy. 6014 6015 6016 Release code96i - 1996-07-27 20:11:35 -0400 6017 6018 Paul's suggested patch for strftime %V week numbers 6019 6020 6021 Release data96i - 1996-07-01 18:13:04 -0400 6022 6023 "northamerica" and "europe" changes by Paul Eggert 6024 6025 6026 Release code96h - 1996-06-05 08:02:21 -0400 6027 6028 fix for handling transitions specified in Universal Time 6029 6030 Some "public domain" notices have also been added. 6031 6032 6033 Release code96g - 1996-05-16 14:00:26 -0400 6034 6035 fix for the simultaneous-DST-and-zone-change challenge 6036 6037 6038 Release data96h - 1996-05-09 17:40:51 -0400 6039 6040 changes by Paul Eggert 6041 6042 6043 Release code96f-data96g - 1996-05-03 03:09:59 -0000 6044 [tzcode96f.tar.gz + tzdata96g.tar.gz are both missing!] 6045 6046 The changes get us some of the way to fixing the problems noted in Paul 6047 Eggert's letter yesterday (in addition to a few others). The approach 6048 has been to make zic a bit smarter about figuring out what time zone 6049 abbreviations apply just after the time specified in the "UNTIL" part 6050 of a zone line. Putting the smarts in zic means avoiding having 6051 transition times show up in both "Zone" lines and "Rule" lines, which 6052 in turn avoids multiple transition time entries in time zone files. 6053 (This also makes the zic input files such as "europe" a bit shorter and 6054 should ease maintenance.) 6055 6056 6057 Release data96f - 1996-04-19 19:20:03 -0000 6058 [tzdata96f.tar.gz is missing!] 6059 6060 The only changes are to the "northamerica" file; the time zone 6061 abbreviation for Denver is corrected to MST (and MDT), and the 6062 comments for Mexico have been updated. 6063 6064 6065 Release data96e - 1996-03-19 17:37:26 -0500 6066 6067 Proposals by Paul Eggert, in particular the Portugal change that 6068 comes into play at the end of this month. 6069 6070 6071 Release data96d - 1996-03-18 20:49:39 -0500 6072 6073 [not summarized] 6074 6075 6076 Release code96e - 1996-02-29 15:43:27 -0000 6077 [tzcode96e.tar.gz is missing!] 6078 6079 internationalization changes and the fix to the documentation for strftime 6080 6081 6082 Release code96d-data96c - 1996-02-12 11:05:27 -0500 6083 6084 The "code" file simply updates Bob Kridle's electronic address. 6085 6086 The "data" file updates rules for Mexico. 6087 6088 6089 Release data96b - 1996-01-27 15:44:42 -0500 6090 6091 Kiribati change 6092 6093 6094 Release code96c - 1996-01-16 16:58:15 -0500 6095 6096 leap-year streamlining and binary-search changes 6097 6098 fix to newctime.3 6099 6100 6101 Release code96b - 1996-01-10 20:42:39 -0500 6102 6103 fixes and enhancements from Paul Eggert, including code that 6104 emulates the behavior of recent versions of the SunOS "date" 6105 command. 6106 6107 6108 Release 96a - 1996-01-06 09:08:24 -0500 6109 6110 Israel updates 6111 6112 fixes to strftime.c for correct ISO 8601 week number generation, 6113 plus support for two new formats ('G' and 'g') to give ISO 8601 year 6114 numbers (which are not necessarily the same as calendar year numbers) 6115 6116 6117 Release code95i-data95m - 1995-12-21 12:46:47 -0500 6118 6119 The latest revisions from Paul Eggert are included, the usno1995 6120 file has been updated, and a new file ("WWW") covering useful URLs 6121 has been added. 6122 6123 6124 Release code95h-data95l - 1995-12-19 18:10:12 -0500 6125 6126 A simplification of a macro definition, a change to data for Sudan, 6127 and (for last minute shoppers) notes in the "Music" file on the CD 6128 "Old Man Time". 6129 6130 6131 Release code95g-data95k - 1995-10-30 10:32:47 -0500 6132 6133 (slightly reformatted) 8-bit-clean proposed patch 6134 6135 minor patch: US/Eastern -> America/New_York 6136 6137 snapshot of the USNO's latest data ("usno1995") 6138 6139 some other minor cleanups 6140 6141 6142 Release code95f-data95j - 1995-10-28 21:01:34 -0000 6143 [tzcode95f.tar.gz + tzdata95j.tar.gz are both missing!] 6144 6145 European cleanups 6146 6147 support for 64-bit time_t's 6148 6149 optimization in localtime.c 6150 6151 6152 Release code95e - 1995-10-13 13:23:57 -0400 6153 6154 the mktime change to scan from future to past when trying to find time zone 6155 offsets 6156 6157 6158 Release data95i - 1995-09-26 10:43:26 -0400 6159 6160 For Canada/Central, guess that the Sun customer's "one week too 6161 early" was just a approximation, and the true error is one month 6162 too early. This is consistent with the rest of Canada. 6163 6164 6165 Release data95h - 1995-09-21 11:26:48 -0400 6166 6167 latest changes from Paul Eggert 6168 6169 6170 Release code95d - 1995-09-14 11:14:45 -0400 6171 6172 the addition of a "Music" file, which documents four recorded 6173 versions of the tune "Save That Time". 6174 6175 6176 Release data95g - 1995-09-01 17:21:36 -0400 6177 6178 "yearistype" correction 6179 6180 6181 Release data95f - 1995-08-28 20:46:56 -0400 6182 6183 Paul Eggert's change to the australasia file 6184 6185 6186 Release data95e - 1995-07-08 18:02:34 -0400 6187 6188 The only change is a leap second at the end of this year. 6189 Thanks to Bradley White for forwarding news on the leap second. 6190 6191 6192 Release data95d - 1995-07-03 13:26:22 -0400 6193 6194 Paul Eggert's changes 6195 6196 6197 Release data95c - 1995-07-02 19:19:28 -0400 6198 6199 changes to "asia", "backward", "europe", and "southamerica" 6200 (read: northamericacentrics need not apply) 6201 6202 6203 Release code95c - 1995-03-13 14:00:46 -0500 6204 6205 one-line fix for sign extension problems in detzcode 6206 6207 6208 Release 95b - 1995-03-04 11:22:38 -0500 6209 6210 Minor changes in both: 6211 6212 The "code" file contains a workaround for the lack of "unistd.h" in 6213 Microsoft C++ version 7. 6214 6215 The "data" file contains a fixed "Link" for America/Shiprock. 6216 6217 6218 Release 94h - 1994-12-10 12:51:14 -0500 6219 6220 The files: 6221 6222 * incorporate the changes to "zdump" and "date" to make changes to 6223 the "TZ" environment variable permanent; 6224 6225 * incorporate the table changes by Paul Eggert; 6226 6227 * include (and document) support for universal time specifications in 6228 data files - but do not (yet) include use of this feature in the 6229 data files. 6230 6231 Think of this as "TZ Classic" - the software has been set up not to break if 6232 universal time shows up in its input, and data entries have been 6233 left as is so as not to break existing implementations. 6234 6235 6236 Release data94f - 1994-08-20 12:56:09 -0400 6237 6238 (with thanks!) the latest data updates from Paul Eggert 6239 6240 6241 Release data94e - 1994-06-04 13:13:53 -0400 6242 6243 [not summarized] 6244 6245 6246 Release code94g - 1994-05-05 12:14:07 -0400 6247 6248 fix missing "optind.c" and a reference to it in the Makefile 6249 6250 6251 Release code94f - 1994-05-05 13:00:33 -0000 6252 [tzcode94f.tar.gz is missing!] 6253 6254 changes to avoid overflow in difftime, as well as changes to cope 6255 with the 52/53 challenge in strftime 6256 6257 6258 Release code94e - 1994-03-30 23:32:59 -0500 6259 6260 change for the benefit of PCTS 6261 6262 6263 Release 94d - 1994-02-24 15:42:25 -0500 6264 6265 Avoid clashes with POSIX semantics for zones such as GMT+4. 6266 6267 Some other very minor housekeeping is also present. 6268 6269 6270 Release code94c - 1994-02-10 08:52:40 -0500 6271 6272 Fix bug where mkdirs was broken unless you compile with 6273 -fwritable-strings (which is generally losing to do). 6274 6275 6276 Release 94b - 1994-02-07 10:04:33 -0500 6277 6278 work by Paul Eggert who notes: 6279 6280 I found another book of time zone histories by E W Whitman; it's not 6281 as extensive as Shanks but has a few goodies of its own. I used it 6282 to update the tables. I also fixed some more as a result of 6283 correspondence with Adam David and Peter Ilieve, and move some stray 6284 links from 'europe' to 'backward'. I corrected some scanning errors 6285 in usno1989. 6286 6287 As far as the code goes, I fixed zic to allow years in the range 6288 INT_MIN to INT_MAX; this fixed a few boundary conditions around 1900. 6289 And I cleaned up the zic documentation a little bit. 6290 6291 6292 Release data94a - 1994-02-03 08:58:54 -0500 6293 6294 It simply incorporates the recently announced leap second into the 6295 "leapseconds" file. 6296 6297 6298 Release 93g - 1993-11-22 17:28:27 -0500 6299 6300 Paul Eggert has provided a good deal of historic information (based 6301 on Shanks), and there are some code changes to deal with the buglets 6302 that crawled out in dealing with the new information. 6303 6304 6305 Release 93f - 1993-10-15 12:27:46 -0400 6306 6307 Paul Eggert's changes 6308 6309 6310 Release 93e - 1993-09-05 21:21:44 -0400 6311 6312 This has updated data for Israel, England, and Kwajalein. There's 6313 also an update to "zdump" to cope with Kwajalein's 24-hour jump. 6314 Thanks to Paul Eggert and Peter Ilieve for the changes. 6315 6316 6317 Release 93d - 1993-06-17 23:34:17 -0400 6318 6319 new fix and new data on Israel 6320 6321 6322 Release 93c - 1993-06-06 19:31:55 -0400 6323 6324 [not summarized] 6325 6326 6327 Release 93b - 1993-02-02 14:53:58 -0500 6328 6329 updated "leapseconds" file 6330 6331 6332 Release 93 - 1993-01-08 07:01:06 -0500 6333 6334 At kre's suggestion, the package has been split in two - a code piece 6335 (which also includes documentation) that's only of use to folks who 6336 want to recompile things and a data piece useful to anyone who can 6337 run "zic". 6338 6339 The new version has a few changes to the data files, a few 6340 portability changes, and an off-by-one fix (with thanks to 6341 Tom Karzes at deshaw.com for providing a description and a 6342 solution). 6343 6344 6345 Release 92c - 1992-11-21 17:35:36 -0000 6346 [tz92c.tar.Z is missing!] 6347 6348 The fallout from the latest round of DST transitions. 6349 6350 There are changes for Portugal, Saskatchewan, and "Pacific-New"; 6351 there's also a change to "zic.c" that makes it portable to more systems. 6352 6353 6354 Release 92 - 1992-04-25 18:17:03 -0000 6355 [tz92.tar.Z is missing!] 6356 6357 By popular demand (well, at any rate, following a request by kre at munnari) 6358 6359 6360 The 1989 update of the time zone package featured: 6361 6362 * POSIXization (including interpretation of POSIX-style TZ environment 6363 variables, provided by Guy Harris), 6364 * ANSIfication (including versions of "mktime" and "difftime"), 6365 * SVIDulation (an "altzone" variable) 6366 * MACHination (the "gtime" function) 6367 * corrections to some time zone data (including corrections to the rules 6368 for Great Britain and New Zealand) 6369 * reference data from the United States Naval Observatory for folks who 6370 want to do additional time zones 6371 * and the 1989 data for Saudi Arabia. 6372 6373 (Since this code will be treated as "part of the implementation" in some 6374 places and as "part of the application" in others, there's no good way to 6375 name functions, such as timegm, that are not part of the proposed ANSI C 6376 standard; such functions have kept their old, underscore-free names in this 6377 update.) 6378 6379 And the "dysize" function has disappeared; it was present to allow 6380 compilation of the "date" command on old BSD systems, and a version of "date" 6381 is now provided in the package. The "date" command is not created when you 6382 "make all" since it may lack options provided by the version distributed with 6383 your operating system, or may not interact with the system in the same way 6384 the native version does. 6385 6386 Since POSIX frowns on correct leap second handling, the default behavior of 6387 the "zic" command (in the absence of a "-L" option) has been changed to omit 6388 leap second information from its output files. 6389 6390 6391 ----- 6392 Notes 6393 6394 This file contains copies of the part of each release announcement 6395 that talks about the changes in that release. The text has been 6396 adapted and reformatted for the purposes of this file. 6397 6398 Traditionally a release R consists of a pair of tarball files, 6399 tzcodeR.tar.gz and tzdataR.tar.gz. However, some releases (e.g., 6400 code2010a, data2012c) consist of just one or the other tarball, and a 6401 few (e.g., code2012c-data2012d) have tarballs with mixed version 6402 numbers. Recent releases also come in an experimental format 6403 consisting of a single tarball tzdb-R.tar.lz with extra data. 6404 6405 Release timestamps are taken from the release's commit (for newer, 6406 Git-based releases), from the newest file in the tarball (for older 6407 releases, where this info is available) or from the email announcing 6408 the release (if all else fails; these are marked with a time zone 6409 abbreviation of -0000 and an "is missing!" comment). 6410 6411 Earlier versions of the code and data were not announced on the tz 6412 list and are not summarized here. 6413 6414 This file is in the public domain. 6415 6416 Local Variables: 6417 coding: utf-8 6418 End: 6419
Indexes created Tue Sep 30 11:09:46 GMT 2025