southamerica revision 1.1.1.1.4.6.2.3
1 # tzdb data for South America and environs 2 3 # This file is in the public domain, so clarified as of 4 # 2009-05-17 by Arthur David Olson. 5 6 # This file is by no means authoritative; if you think you know better, 7 # go ahead and edit the file (and please send any changes to 8 # tz (a] iana.org for general use in the future). For more, please see 9 # the file CONTRIBUTING in the tz distribution. 10 11 # From Paul Eggert (2016-12-05): 12 # 13 # Unless otherwise specified, the source for data through 1990 is: 14 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition), 15 # San Diego: ACS Publications, Inc. (2003). 16 # Unfortunately this book contains many errors and cites no sources. 17 # 18 # Many years ago Gwillim Law wrote that a good source 19 # for time zone data was the International Air Transport 20 # Association's Standard Schedules Information Manual (IATA SSIM), 21 # published semiannually. Law sent in several helpful summaries 22 # of the IATA's data after 1990. Except where otherwise noted, 23 # IATA SSIM is the source for entries after 1990. 24 # 25 # For data circa 1899, a common source is: 26 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94. 27 # https://www.jstor.org/stable/1774359 28 # 29 # These tables use numeric abbreviations like -03 and -0330 for 30 # integer hour and minute UT offsets. Although earlier editions used 31 # alphabetic time zone abbreviations, these abbreviations were 32 # invented and did not reflect common practice. 33 34 ############################################################################### 35 36 ############################################################################### 37 38 # Argentina 39 40 # From Bob Devine (1988-01-28): 41 # Argentina: first Sunday in October to first Sunday in April since 1976. 42 # Double Summer time from 1969 to 1974. Switches at midnight. 43 44 # From U. S. Naval Observatory (1988-01-19): 45 # ARGENTINA 3 H BEHIND UTC 46 47 # From Hernan G. Otero (1995-06-26): 48 # I am sending modifications to the Argentine time zone table... 49 # AR was chosen because they are the ISO letters that represent Argentina. 50 51 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 52 Rule Arg 1930 only - Dec 1 0:00 1:00 - 53 Rule Arg 1931 only - Apr 1 0:00 0 - 54 Rule Arg 1931 only - Oct 15 0:00 1:00 - 55 Rule Arg 1932 1940 - Mar 1 0:00 0 - 56 Rule Arg 1932 1939 - Nov 1 0:00 1:00 - 57 Rule Arg 1940 only - Jul 1 0:00 1:00 - 58 Rule Arg 1941 only - Jun 15 0:00 0 - 59 Rule Arg 1941 only - Oct 15 0:00 1:00 - 60 Rule Arg 1943 only - Aug 1 0:00 0 - 61 Rule Arg 1943 only - Oct 15 0:00 1:00 - 62 Rule Arg 1946 only - Mar 1 0:00 0 - 63 Rule Arg 1946 only - Oct 1 0:00 1:00 - 64 Rule Arg 1963 only - Oct 1 0:00 0 - 65 Rule Arg 1963 only - Dec 15 0:00 1:00 - 66 Rule Arg 1964 1966 - Mar 1 0:00 0 - 67 Rule Arg 1964 1966 - Oct 15 0:00 1:00 - 68 Rule Arg 1967 only - Apr 2 0:00 0 - 69 Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 - 70 Rule Arg 1968 1969 - Apr Sun>=1 0:00 0 - 71 Rule Arg 1974 only - Jan 23 0:00 1:00 - 72 Rule Arg 1974 only - May 1 0:00 0 - 73 Rule Arg 1988 only - Dec 1 0:00 1:00 - 74 # 75 # From Hernan G. Otero (1995-06-26): 76 # These corrections were contributed by InterSoft Argentina S.A., 77 # obtaining the data from the: 78 # Talleres de Hidrografa Naval Argentina 79 # (Argentine Naval Hydrography Institute) 80 Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 - 81 Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 - 82 # 83 # From Hernan G. Otero (1995-06-26): 84 # From this moment on, the law that mandated the daylight saving 85 # time corrections was derogated and no more modifications 86 # to the time zones (for daylight saving) are now made. 87 # 88 # From Rives McDow (2000-01-10): 89 # On October 3, 1999, 0:00 local, Argentina implemented daylight savings time, 90 # which did not result in the switch of a time zone, as they stayed 9 hours 91 # from the International Date Line. 92 Rule Arg 1999 only - Oct Sun>=1 0:00 1:00 - 93 # From Paul Eggert (2007-12-28): 94 # DST was set to expire on March 5, not March 3, but since it was converted 95 # to standard time on March 3 it's more convenient for us to pretend that 96 # it ended on March 3. 97 Rule Arg 2000 only - Mar 3 0:00 0 - 98 # 99 # From Peter Gradelski via Steffen Thorsen (2000-03-01): 100 # We just checked with our So Paulo office and they say the government of 101 # Argentina decided not to become one of the countries that go on or off DST. 102 # So Buenos Aires should be -3 hours from GMT at all times. 103 # 104 # From Fabin L. Arce Jofr (2000-04-04): 105 # The law that claimed DST for Argentina was derogated by President Fernando 106 # de la Ra on March 2, 2000, because it would make people spend more energy 107 # in the winter time, rather than less. The change took effect on March 3. 108 # 109 # From Mariano Absatz (2001-06-06): 110 # one of the major newspapers here in Argentina said that the 1999 111 # Timezone Law (which never was effectively applied) will (would?) be 112 # in effect.... The article is at 113 # http://ar.clarin.com/diario/2001-06-06/e-01701.htm 114 # ... The Law itself is "Ley No. 25155", sanctioned on 1999-08-25, enacted 115 # 1999-09-17, and published 1999-09-21. The official publication is at: 116 # http://www.boletin.jus.gov.ar/BON/Primera/1999/09-Septiembre/21/PDF/BO21-09-99LEG.PDF 117 # Regretfully, you have to subscribe (and pay) for the on-line version.... 118 # 119 # (2001-06-12): 120 # the timezone for Argentina will not change next Sunday. 121 # Apparently it will do so on Sunday 24th.... 122 # http://ar.clarin.com/diario/2001-06-12/s-03501.htm 123 # 124 # (2001-06-25): 125 # Last Friday (yes, the last working day before the date of the change), the 126 # Senate annulled the 1999 law that introduced the changes later postponed. 127 # http://www.clarin.com.ar/diario/2001-06-22/s-03601.htm 128 # It remains the vote of the Deputies..., but it will be the same.... 129 # This kind of things had always been done this way in Argentina. 130 # We are still -03:00 all year round in all of the country. 131 # 132 # From Steffen Thorsen (2007-12-21): 133 # A user (Leonardo Chaim) reported that Argentina will adopt DST.... 134 # all of the country (all Zone-entries) are affected. News reports like 135 # http://www.lanacion.com.ar/opinion/nota.asp?nota_id=973037 indicate 136 # that Argentina will use DST next year as well, from October to 137 # March, although exact rules are not given. 138 # 139 # From Jesper Nrgaard Welen (2007-12-26) 140 # The last hurdle of Argentina DST is over, the proposal was approved in 141 # the lower chamber too (Diputados) with a vote 192 for and 2 against. 142 # By the way thanks to Mariano Absatz and Daniel Mario Vega for the link to 143 # the original scanned proposal, where the dates and the zero hours are 144 # clear and unambiguous...This is the article about final approval: 145 # http://www.lanacion.com.ar/politica/nota.asp?nota_id=973996 146 # 147 # From Paul Eggert (2007-12-22): 148 # For dates after mid-2008, the following rules are my guesses and 149 # are quite possibly wrong, but are more likely than no DST at all. 150 151 # From Alexander Krivenyshev (2008-09-05): 152 # As per message from Carlos Alberto Fonseca Arauz (Nicaragua), 153 # Argentina will start DST on Sunday October 19, 2008. 154 # 155 # http://www.worldtimezone.com/dst_news/dst_news_argentina03.html 156 # http://www.impulsobaires.com.ar/nota.php?id=57832 (in spanish) 157 158 # From Juan Manuel Docile in https://bugs.gentoo.org/240339 (2008-10-07) 159 # via Rodrigo Severo: 160 # Argentinian law No. 25.155 is no longer valid. 161 # http://www.infoleg.gov.ar/infolegInternet/anexos/60000-64999/60036/norma.htm 162 # The new one is law No. 26.350 163 # http://www.infoleg.gov.ar/infolegInternet/anexos/135000-139999/136191/norma.htm 164 # So there is no summer time in Argentina for now. 165 166 # From Mariano Absatz (2008-10-20): 167 # Decree 1693/2008 applies Law 26.350 for the summer 2008/2009 establishing DST 168 # in Argentina from 2008-10-19 until 2009-03-15. 169 # http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=16102008&pi=3&pf=4&s=0&sec=01 170 # 171 172 # Decree 1705/2008 excepting 12 Provinces from applying DST in the summer 173 # 2008/2009: Catamarca, La Rioja, Mendoza, Salta, San Juan, San Luis, La 174 # Pampa, Neuqun, Rio Negro, Chubut, Santa Cruz and Tierra del Fuego 175 # http://www.boletinoficial.gov.ar/Bora.Portal/CustomControls/PdfContent.aspx?fp=17102008&pi=1&pf=1&s=0&sec=01 176 # 177 # Press release 235 dated Saturday October 18th, from the Government of the 178 # Province of Jujuy saying it will not apply DST either (even when it was not 179 # included in Decree 1705/2008). 180 # http://www.jujuy.gov.ar/index2/partes_prensa/18_10_08/235-181008.doc 181 182 # From fullinet (2009-10-18): 183 # As announced in 184 # http://www.argentina.gob.ar/argentina/portal/paginas.dhtml?pagina=356 185 # (an official .gob.ar) under title: "Sin Cambio de Hora" 186 # (English: "No hour change"). 187 # 188 # "Por el momento, el Gobierno Nacional resolvi no modificar la hora 189 # oficial, decisin que estaba en estudio para su implementacin el 190 # domingo 18 de octubre. Desde el Ministerio de Planificacin se anunci 191 # que la Argentina hoy, en estas condiciones meteorolgicas, no necesita 192 # la modificacin del huso horario, ya que 2009 nos encuentra con 193 # crecimiento en la produccin y distribucin energtica." 194 195 Rule Arg 2007 only - Dec 30 0:00 1:00 - 196 Rule Arg 2008 2009 - Mar Sun>=15 0:00 0 - 197 Rule Arg 2008 only - Oct Sun>=15 0:00 1:00 - 198 199 # From Mariano Absatz (2004-05-21): 200 # Today it was officially published that the Province of Mendoza is changing 201 # its timezone this winter... starting tomorrow night.... 202 # http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040521-27158-normas.pdf 203 # From Paul Eggert (2004-05-24): 204 # It's Law No. 7,210. This change is due to a public power emergency, so for 205 # now we'll assume it's for this year only. 206 # 207 # From Paul Eggert (2018-01-31): 208 # Hora de verano para la Repblica Argentina 209 # http://buenasiembra.com.ar/esoterismo/astrologia/hora-de-verano-de-la-republica-argentina-27.html 210 # says that standard time in Argentina from 1894-10-31 211 # to 1920-05-01 was -4:16:48.25. Go with this more-precise value 212 # over Shanks & Pottenger. It is upward compatible with Milne, who 213 # says Crdoba time was -4:16:48.2. 214 215 # 216 # From Mariano Absatz (2004-06-05): 217 # These media articles from a major newspaper mostly cover the current state: 218 # http://www.lanacion.com.ar/04/05/27/de_604825.asp 219 # http://www.lanacion.com.ar/04/05/28/de_605203.asp 220 # 221 # The following eight (8) provinces pulled clocks back to UTC-04:00 at 222 # midnight Monday May 31st. (that is, the night between 05/31 and 06/01). 223 # Apparently, all nine provinces would go back to UTC-03:00 at the same 224 # time in October 17th. 225 # 226 # Catamarca, Chubut, La Rioja, San Juan, San Luis, Santa Cruz, 227 # Tierra del Fuego, Tucumn. 228 # 229 # From Mariano Absatz (2004-06-14): 230 # ... this weekend, the Province of Tucumn decided it'd go back to UTC-03:00 231 # yesterday midnight (that is, at 24:00 Saturday 12th), since the people's 232 # annoyance with the change is much higher than the power savings obtained.... 233 # 234 # From Gwillim Law (2004-06-14): 235 # http://www.lanacion.com.ar/04/06/10/de_609078.asp ... 236 # "The time change in Tierra del Fuego was a conflicted decision from 237 # the start. The government had decreed that the measure would take 238 # effect on June 1, but a normative error forced the new time to begin 239 # three days earlier, from a Saturday to a Sunday.... 240 # Our understanding was that the change was originally scheduled to take place 241 # on June 1 at 00:00 in Chubut, Santa Cruz, Tierra del Fuego (and some other 242 # provinces). Sunday was May 30, only two days earlier. So the article 243 # contains a contradiction. I would give more credence to the Saturday/Sunday 244 # date than the "three days earlier" phrase, and conclude that Tierra del 245 # Fuego set its clocks back at 2004-05-30 00:00. 246 # 247 # From Steffen Thorsen (2004-10-05): 248 # The previous law 7210 which changed the province of Mendoza's time zone 249 # back in May have been modified slightly in a new law 7277, which set the 250 # new end date to 2004-09-26 (original date was 2004-10-17). 251 # http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040924-27244-normas.pdf 252 # 253 # From Mariano Absatz (2004-10-05): 254 # San Juan changed from UTC-03:00 to UTC-04:00 at midnight between 255 # Sunday, May 30th and Monday, May 31st. It changed back to UTC-03:00 256 # at midnight between Saturday, July 24th and Sunday, July 25th.... 257 # http://www.sanjuan.gov.ar/prensa/archivo/000329.html 258 # http://www.sanjuan.gov.ar/prensa/archivo/000426.html 259 # http://www.sanjuan.gov.ar/prensa/archivo/000441.html 260 261 # From Alex Krivenyshev (2008-01-17): 262 # Here are articles that Argentina Province San Luis is planning to end DST 263 # as earlier as upcoming Monday January 21, 2008 or February 2008: 264 # 265 # Provincia argentina retrasa reloj y marca diferencia con resto del pas 266 # (Argentine Province delayed clock and mark difference with the rest of the 267 # country) 268 # http://cl.invertia.com/noticias/noticia.aspx?idNoticia=200801171849_EFE_ET4373&idtel 269 # 270 # Es inminente que en San Luis atrasen una hora los relojes 271 # (It is imminent in San Luis clocks one hour delay) 272 # https://www.lagaceta.com.ar/nota/253414/Economia/Es-inminente-que-en-San-Luis-atrasen-una-hora-los-relojes.html 273 # http://www.worldtimezone.com/dst_news/dst_news_argentina02.html 274 275 # From Jesper Nrgaard Welen (2008-01-18): 276 # The page of the San Luis provincial government 277 # http://www.sanluis.gov.ar/notas.asp?idCanal=0&id=22812 278 # confirms what Alex Krivenyshev has earlier sent to the tz 279 # emailing list about that San Luis plans to return to standard 280 # time much earlier than the rest of the country. It also 281 # confirms that upon request the provinces San Juan and Mendoza 282 # refused to follow San Luis in this change. 283 # 284 # The change is supposed to take place Monday the 21st at 0:00 285 # hours. As far as I understand it if this goes ahead, we need 286 # a new timezone for San Luis (although there are also documented 287 # independent changes in the southamerica file of San Luis in 288 # 1990 and 1991 which has not been confirmed). 289 290 # From Jesper Nrgaard Welen (2008-01-25): 291 # Unfortunately the below page has become defunct, about the San Luis 292 # time change. Perhaps because it now is part of a group of pages "Most 293 # important pages of 2008." 294 # 295 # You can use 296 # http://www.sanluis.gov.ar/notas.asp?idCanal=8141&id=22834 297 # instead it seems. Or use "Buscador" from the main page of the San Luis 298 # government, and fill in "huso" and click OK, and you will get 3 pages 299 # from which the first one is identical to the above. 300 301 # From Mariano Absatz (2008-01-28): 302 # I can confirm that the Province of San Luis (and so far only that 303 # province) decided to go back to UTC-3 effective midnight Jan 20th 2008 304 # (that is, Monday 21st at 0:00 is the time the clocks were delayed back 305 # 1 hour), and they intend to keep UTC-3 as their timezone all year round 306 # (that is, unless they change their mind any minute now). 307 # 308 # So we'll have to add yet another city to 'southamerica' (I think San 309 # Luis city is the mos populated city in the Province, so it'd be 310 # America/Argentina/San_Luis... of course I can't remember if San Luis's 311 # history of particular changes goes along with Mendoza or San Juan :-( 312 # (I only remember not being able to collect hard facts about San Luis 313 # back in 2004, when these provinces changed to UTC-4 for a few days, I 314 # mailed them personally and never got an answer). 315 316 # From Paul Eggert (2014-08-12): 317 # Unless otherwise specified, data entries are from Shanks & Pottenger through 318 # 1992, from the IATA otherwise. As noted below, Shanks & Pottenger say that 319 # America/Cordoba split into 6 subregions during 1991/1992, one of which 320 # was America/San_Luis, but we haven't verified this yet so for now we'll 321 # keep America/Cordoba a single region rather than splitting it into the 322 # other 5 subregions. 323 324 # From Mariano Absatz (2009-03-13): 325 # Yesterday (with our usual 2-day notice) the Province of San Luis 326 # decided that next Sunday instead of "staying" @utc-03:00 they will go 327 # to utc-04:00 until the second Saturday in October... 328 # 329 # The press release is at 330 # http://www.sanluis.gov.ar/SL/Paginas/NoticiaDetalle.asp?TemaId=1&InfoPrensaId=3102 331 # (I couldn't find the decree, but www.sanluis.gov.ar 332 # is the official page for the Province Government.) 333 # 334 # There's also a note in only one of the major national papers ... 335 # http://www.lanacion.com.ar/nota.asp?nota_id=1107912 336 # 337 # The press release says [quick and dirty translation]: 338 # ... announced that next Sunday, at 00:00, Puntanos (the San Luis 339 # inhabitants) will have to turn back one hour their clocks 340 # 341 # Since then, San Luis will establish its own Province timezone. Thus, 342 # during 2009, this timezone change will run from 00:00 the third Sunday 343 # in March until 24:00 of the second Saturday in October. 344 345 # From Mariano Absatz (2009-10-16): 346 # ...the Province of San Luis is a case in itself. 347 # 348 # The Law at 349 # http://www.diputadossanluis.gov.ar/diputadosasp/paginas/verNorma.asp?NormaID=276 350 # is ambiguous because establishes a calendar from the 2nd Sunday in 351 # October at 0:00 thru the 2nd Saturday in March at 24:00 and the 352 # complement of that starting on the 2nd Sunday of March at 0:00 and 353 # ending on the 2nd Saturday of March at 24:00. 354 # 355 # This clearly breaks every time the 1st of March or October is a Sunday. 356 # 357 # IMHO, the "spirit of the Law" is to make the changes at 0:00 on the 2nd 358 # Sunday of October and March. 359 # 360 # The problem is that the changes in the rest of the Provinces that did 361 # change in 2007/2008, were made according to the Federal Law and Decrees 362 # that did so on the 3rd Sunday of October and March. 363 # 364 # In fact, San Luis actually switched from UTC-4 to UTC-3 last Sunday 365 # (October 11th) at 0:00. 366 # 367 # So I guess a new set of rules, besides "Arg", must be made and the last 368 # America/Argentina/San_Luis entries should change to use these... 369 # ... 370 371 # From Alexander Krivenyshev (2010-04-09): 372 # According to news reports from El Diario de la Repblica Province San 373 # Luis, Argentina (standard time UTC-04) will keep Daylight Saving Time 374 # after April 11, 2010 - will continue to have same time as rest of 375 # Argentina (UTC-3) (no DST). 376 # 377 # Confirmaron la prrroga del huso horario de verano (Spanish) 378 # http://www.eldiariodelarepublica.com/index.php?option=com_content&task=view&id=29383&Itemid=9 379 # or (some English translation): 380 # http://www.worldtimezone.com/dst_news/dst_news_argentina08.html 381 382 # From Mariano Absatz (2010-04-12): 383 # yes...I can confirm this...and given that San Luis keeps calling 384 # UTC-03:00 "summer time", we should't just let San Luis go back to "Arg" 385 # rules...San Luis is still using "Western ARgentina Time" and it got 386 # stuck on Summer daylight savings time even though the summer is over. 387 388 # From Paul Eggert (2018-01-23): 389 # Perhaps San Luis operates on the legal fiction that it is at -04 390 # with perpetual daylight saving time, but ordinary usage typically seems to 391 # just say it's at -03; see, for example, 392 # https://es.wikipedia.org/wiki/Hora_oficial_argentina 393 # We've documented similar situations as being plain changes to 394 # standard time, so let's do that here too. This does not change UTC 395 # offsets, only tm_isdst and the time zone abbreviations. One minor 396 # plus is that this silences a zic complaint that there's no POSIX TZ 397 # setting for timestamps past 2038. 398 399 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 400 # 401 # Buenos Aires (BA), Capital Federal (CF), 402 Zone America/Argentina/Buenos_Aires -3:53:48 - LMT 1894 Oct 31 403 -4:16:48 - CMT 1920 May # Crdoba Mean Time 404 -4:00 - -04 1930 Dec 405 -4:00 Arg -04/-03 1969 Oct 5 406 -3:00 Arg -03/-02 1999 Oct 3 407 -4:00 Arg -04/-03 2000 Mar 3 408 -3:00 Arg -03/-02 409 # 410 # Crdoba (CB), Santa Fe (SF), Entre Ros (ER), Corrientes (CN), Misiones (MN), 411 # Chaco (CC), Formosa (FM), Santiago del Estero (SE) 412 # 413 # Shanks & Pottenger also make the following claims, which we haven't verified: 414 # - Formosa switched to -3:00 on 1991-01-07. 415 # - Misiones switched to -3:00 on 1990-12-29. 416 # - Chaco switched to -3:00 on 1991-01-04. 417 # - Santiago del Estero switched to -4:00 on 1991-04-01, 418 # then to -3:00 on 1991-04-26. 419 # 420 Zone America/Argentina/Cordoba -4:16:48 - LMT 1894 Oct 31 421 -4:16:48 - CMT 1920 May 422 -4:00 - -04 1930 Dec 423 -4:00 Arg -04/-03 1969 Oct 5 424 -3:00 Arg -03/-02 1991 Mar 3 425 -4:00 - -04 1991 Oct 20 426 -3:00 Arg -03/-02 1999 Oct 3 427 -4:00 Arg -04/-03 2000 Mar 3 428 -3:00 Arg -03/-02 429 # 430 # Salta (SA), La Pampa (LP), Neuqun (NQ), Rio Negro (RN) 431 Zone America/Argentina/Salta -4:21:40 - LMT 1894 Oct 31 432 -4:16:48 - CMT 1920 May 433 -4:00 - -04 1930 Dec 434 -4:00 Arg -04/-03 1969 Oct 5 435 -3:00 Arg -03/-02 1991 Mar 3 436 -4:00 - -04 1991 Oct 20 437 -3:00 Arg -03/-02 1999 Oct 3 438 -4:00 Arg -04/-03 2000 Mar 3 439 -3:00 Arg -03/-02 2008 Oct 18 440 -3:00 - -03 441 # 442 # Tucumn (TM) 443 Zone America/Argentina/Tucuman -4:20:52 - LMT 1894 Oct 31 444 -4:16:48 - CMT 1920 May 445 -4:00 - -04 1930 Dec 446 -4:00 Arg -04/-03 1969 Oct 5 447 -3:00 Arg -03/-02 1991 Mar 3 448 -4:00 - -04 1991 Oct 20 449 -3:00 Arg -03/-02 1999 Oct 3 450 -4:00 Arg -04/-03 2000 Mar 3 451 -3:00 - -03 2004 Jun 1 452 -4:00 - -04 2004 Jun 13 453 -3:00 Arg -03/-02 454 # 455 # La Rioja (LR) 456 Zone America/Argentina/La_Rioja -4:27:24 - LMT 1894 Oct 31 457 -4:16:48 - CMT 1920 May 458 -4:00 - -04 1930 Dec 459 -4:00 Arg -04/-03 1969 Oct 5 460 -3:00 Arg -03/-02 1991 Mar 1 461 -4:00 - -04 1991 May 7 462 -3:00 Arg -03/-02 1999 Oct 3 463 -4:00 Arg -04/-03 2000 Mar 3 464 -3:00 - -03 2004 Jun 1 465 -4:00 - -04 2004 Jun 20 466 -3:00 Arg -03/-02 2008 Oct 18 467 -3:00 - -03 468 # 469 # San Juan (SJ) 470 Zone America/Argentina/San_Juan -4:34:04 - LMT 1894 Oct 31 471 -4:16:48 - CMT 1920 May 472 -4:00 - -04 1930 Dec 473 -4:00 Arg -04/-03 1969 Oct 5 474 -3:00 Arg -03/-02 1991 Mar 1 475 -4:00 - -04 1991 May 7 476 -3:00 Arg -03/-02 1999 Oct 3 477 -4:00 Arg -04/-03 2000 Mar 3 478 -3:00 - -03 2004 May 31 479 -4:00 - -04 2004 Jul 25 480 -3:00 Arg -03/-02 2008 Oct 18 481 -3:00 - -03 482 # 483 # Jujuy (JY) 484 Zone America/Argentina/Jujuy -4:21:12 - LMT 1894 Oct 31 485 -4:16:48 - CMT 1920 May 486 -4:00 - -04 1930 Dec 487 -4:00 Arg -04/-03 1969 Oct 5 488 -3:00 Arg -03/-02 1990 Mar 4 489 -4:00 - -04 1990 Oct 28 490 -4:00 1:00 -03 1991 Mar 17 491 -4:00 - -04 1991 Oct 6 492 -3:00 1:00 -02 1992 493 -3:00 Arg -03/-02 1999 Oct 3 494 -4:00 Arg -04/-03 2000 Mar 3 495 -3:00 Arg -03/-02 2008 Oct 18 496 -3:00 - -03 497 # 498 # Catamarca (CT), Chubut (CH) 499 Zone America/Argentina/Catamarca -4:23:08 - LMT 1894 Oct 31 500 -4:16:48 - CMT 1920 May 501 -4:00 - -04 1930 Dec 502 -4:00 Arg -04/-03 1969 Oct 5 503 -3:00 Arg -03/-02 1991 Mar 3 504 -4:00 - -04 1991 Oct 20 505 -3:00 Arg -03/-02 1999 Oct 3 506 -4:00 Arg -04/-03 2000 Mar 3 507 -3:00 - -03 2004 Jun 1 508 -4:00 - -04 2004 Jun 20 509 -3:00 Arg -03/-02 2008 Oct 18 510 -3:00 - -03 511 # 512 # Mendoza (MZ) 513 Zone America/Argentina/Mendoza -4:35:16 - LMT 1894 Oct 31 514 -4:16:48 - CMT 1920 May 515 -4:00 - -04 1930 Dec 516 -4:00 Arg -04/-03 1969 Oct 5 517 -3:00 Arg -03/-02 1990 Mar 4 518 -4:00 - -04 1990 Oct 15 519 -4:00 1:00 -03 1991 Mar 1 520 -4:00 - -04 1991 Oct 15 521 -4:00 1:00 -03 1992 Mar 1 522 -4:00 - -04 1992 Oct 18 523 -3:00 Arg -03/-02 1999 Oct 3 524 -4:00 Arg -04/-03 2000 Mar 3 525 -3:00 - -03 2004 May 23 526 -4:00 - -04 2004 Sep 26 527 -3:00 Arg -03/-02 2008 Oct 18 528 -3:00 - -03 529 # 530 # San Luis (SL) 531 532 Rule SanLuis 2008 2009 - Mar Sun>=8 0:00 0 - 533 Rule SanLuis 2007 2008 - Oct Sun>=8 0:00 1:00 - 534 535 Zone America/Argentina/San_Luis -4:25:24 - LMT 1894 Oct 31 536 -4:16:48 - CMT 1920 May 537 -4:00 - -04 1930 Dec 538 -4:00 Arg -04/-03 1969 Oct 5 539 -3:00 Arg -03/-02 1990 540 -3:00 1:00 -02 1990 Mar 14 541 -4:00 - -04 1990 Oct 15 542 -4:00 1:00 -03 1991 Mar 1 543 -4:00 - -04 1991 Jun 1 544 -3:00 - -03 1999 Oct 3 545 -4:00 1:00 -03 2000 Mar 3 546 -3:00 - -03 2004 May 31 547 -4:00 - -04 2004 Jul 25 548 -3:00 Arg -03/-02 2008 Jan 21 549 -4:00 SanLuis -04/-03 2009 Oct 11 550 -3:00 - -03 551 # 552 # Santa Cruz (SC) 553 Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31 554 -4:16:48 - CMT 1920 May 555 -4:00 - -04 1930 Dec 556 -4:00 Arg -04/-03 1969 Oct 5 557 -3:00 Arg -03/-02 1999 Oct 3 558 -4:00 Arg -04/-03 2000 Mar 3 559 -3:00 - -03 2004 Jun 1 560 -4:00 - -04 2004 Jun 20 561 -3:00 Arg -03/-02 2008 Oct 18 562 -3:00 - -03 563 # 564 # Tierra del Fuego, Antrtida e Islas del Atlntico Sur (TF) 565 Zone America/Argentina/Ushuaia -4:33:12 - LMT 1894 Oct 31 566 -4:16:48 - CMT 1920 May 567 -4:00 - -04 1930 Dec 568 -4:00 Arg -04/-03 1969 Oct 5 569 -3:00 Arg -03/-02 1999 Oct 3 570 -4:00 Arg -04/-03 2000 Mar 3 571 -3:00 - -03 2004 May 30 572 -4:00 - -04 2004 Jun 20 573 -3:00 Arg -03/-02 2008 Oct 18 574 -3:00 - -03 575 576 # Aruba 577 Link America/Curacao America/Aruba 578 579 # Bolivia 580 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 581 Zone America/La_Paz -4:32:36 - LMT 1890 582 -4:32:36 - CMT 1931 Oct 15 # Calamarca MT 583 -4:32:36 1:00 BST 1932 Mar 21 # Bolivia ST 584 -4:00 - -04 585 586 # Brazil 587 588 # From Paul Eggert (1993-11-18): 589 # The mayor of Rio recently attempted to change the time zone rules 590 # just in his city, in order to leave more summer time for the tourist trade. 591 # The rule change lasted only part of the day; 592 # the federal government refused to follow the city's rules, and business 593 # was in a chaos, so the mayor backed down that afternoon. 594 595 # From IATA SSIM (1996-02): 596 # _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS), 597 # Santa Catarina (SC), Paran (PR), So Paulo (SP), Rio de Janeiro (RJ), 598 # Esprito Santo (ES), Minas Gerais (MG), Bahia (BA), Gois (GO), 599 # Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL]. 600 # [The last three states are new to this issue of the IATA SSIM.] 601 602 # From Gwillim Law (1996-10-07): 603 # Geography, history (Tocantins was part of Gois until 1989), and other 604 # sources of time zone information lead me to believe that AL, SE, and TO were 605 # always in BR1, and so the only change was whether or not they observed DST.... 606 # The earliest issue of the SSIM I have is 2/91. Each issue from then until 607 # 9/95 says that DST is observed only in the ten states I quoted from 9/95, 608 # along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2 609 # (UTC-4).... The other two time zones given for Brazil are BR3, which is 610 # UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is 611 # UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's 612 # become part of the state of Pernambuco). The boundary between BR1 and BR2 613 # has never been clearly stated. They've simply been called East and West. 614 # However, some conclusions can be drawn from another IATA manual: the Airline 615 # Coding Directory, which lists close to 400 airports in Brazil. For each 616 # airport it gives a time zone which is coded to the SSIM. From that 617 # information, I'm led to conclude that the states of Amap (AP), Cear (CE), 618 # Maranho (MA), Paraba (PR), Pernambuco (PE), Piau (PI), and Rio Grande do 619 # Norte (RN), and the eastern part of Par (PA) are all in BR1 without DST. 620 621 # From Marcos Tadeu (1998-09-27): 622 # Brazilian official page <http://pcdsh01.on.br/verao1.html> 623 624 # From Jesper Nrgaard (2000-11-03): 625 # [For an official list of which regions in Brazil use which time zones, see:] 626 # http://pcdsh01.on.br/Fusbr.htm 627 # http://pcdsh01.on.br/Fusbrhv.htm 628 629 # From Celso Doria via David Madeo (2002-10-09): 630 # The reason for the delay this year has to do with elections in Brazil. 631 # 632 # Unlike in the United States, elections in Brazil are 100% computerized and 633 # the results are known almost immediately. Yesterday, it was the first 634 # round of the elections when 115 million Brazilians voted for President, 635 # Governor, Senators, Federal Deputies, and State Deputies. Nobody is 636 # counting (or re-counting) votes anymore and we know there will be a second 637 # round for the Presidency and also for some Governors. The 2nd round will 638 # take place on October 27th. 639 # 640 # The reason why the DST will only begin November 3rd is that the thousands 641 # of electoral machines used cannot have their time changed, and since the 642 # Constitution says the elections must begin at 8:00 AM and end at 5:00 PM, 643 # the Government decided to postpone DST, instead of changing the Constitution 644 # (maybe, for the next elections, it will be possible to change the clock)... 645 646 # From Rodrigo Severo (2004-10-04): 647 # It's just the biannual change made necessary by the much hyped, supposedly 648 # modern Brazilian eletronic voting machines which, apparently, can't deal 649 # with a time change between the first and the second rounds of the elections. 650 651 # From Steffen Thorsen (2007-09-20): 652 # Brazil will start DST on 2007-10-14 00:00 and end on 2008-02-17 00:00: 653 # http://www.mme.gov.br/site/news/detail.do;jsessionid=BBA06811AFCAAC28F0285210913513DA?newsId=13975 654 655 # From Paul Schulze (2008-06-24): 656 # ...by law number 11.662 of April 24, 2008 (published in the "Diario 657 # Oficial da Unio"...) in Brazil there are changes in the timezones, 658 # effective today (00:00am at June 24, 2008) as follows: 659 # 660 # a) The timezone UTC+5 is extinguished, with all the Acre state and the 661 # part of the Amazonas state that had this timezone now being put to the 662 # timezone UTC+4 663 # b) The whole Par state now is put at timezone UTC+3, instead of just 664 # part of it, as was before. 665 # 666 # This change follows a proposal of senator Tiao Viana of Acre state, that 667 # proposed it due to concerns about open television channels displaying 668 # programs inappropriate to youths in the states that had the timezone 669 # UTC+5 too early in the night. In the occasion, some more corrections 670 # were proposed, trying to unify the timezones of any given state. This 671 # change modifies timezone rules defined in decree 2.784 of 18 June, 672 # 1913. 673 674 # From Rodrigo Severo (2008-06-24): 675 # Just correcting the URL: 676 # https://www.in.gov.br/imprensa/visualiza/index.jsp?jornal=do&secao=1&pagina=1&data=25/04/2008 677 # 678 # As a result of the above Decree I believe the America/Rio_Branco 679 # timezone shall be modified from UTC-5 to UTC-4 and a new timezone shall 680 # be created to represent the...west side of the Par State. I 681 # suggest this new timezone be called Santarem as the most 682 # important/populated city in the affected area. 683 # 684 # This new timezone would be the same as the Rio_Branco timezone up to 685 # the 2008/06/24 change which would be to UTC-3 instead of UTC-4. 686 687 # From Alex Krivenyshev (2008-06-24): 688 # This is a quick reference page for New and Old Brazil Time Zones map. 689 # http://www.worldtimezone.com/brazil-time-new-old.php 690 # 691 # - 4 time zones replaced by 3 time zones - eliminating time zone UTC-05 692 # (state Acre and the part of the Amazonas will be UTC/GMT-04) - western 693 # part of Par state is moving to one timezone UTC-03 (from UTC-04). 694 695 # From Paul Eggert (2002-10-10): 696 # The official decrees referenced below are mostly taken from 697 # Decretos sobre o Horrio de Vero no Brasil. 698 # http://pcdsh01.on.br/DecHV.html 699 700 # From Steffen Thorsen (2008-08-29): 701 # As announced by the government and many newspapers in Brazil late 702 # yesterday, Brazil will start DST on 2008-10-19 (need to change rule) and 703 # it will end on 2009-02-15 (current rule for Brazil is fine). Based on 704 # past years experience with the elections, there was a good chance that 705 # the start was postponed to November, but it did not happen this year. 706 # 707 # It has not yet been posted to http://pcdsh01.on.br/DecHV.html 708 # 709 # An official page about it: 710 # http://www.mme.gov.br/site/news/detail.do?newsId=16722 711 # Note that this link does not always work directly, but must be accessed 712 # by going to 713 # http://www.mme.gov.br/first 714 # 715 # One example link that works directly: 716 # http://jornale.com.br/index.php?option=com_content&task=view&id=13530&Itemid=54 717 # (Portuguese) 718 # 719 # We have a written a short article about it as well: 720 # https://www.timeanddate.com/news/time/brazil-dst-2008-2009.html 721 # 722 # From Alexander Krivenyshev (2011-10-04): 723 # State Bahia will return to Daylight savings time this year after 8 years off. 724 # The announcement was made by Governor Jaques Wagner in an interview to a 725 # television station in Salvador. 726 727 # In Portuguese: 728 # http://g1.globo.com/bahia/noticia/2011/10/governador-jaques-wagner-confirma-horario-de-verao-na-bahia.html 729 # https://noticias.terra.com.br/brasil/noticias/0,,OI5390887-EI8139,00-Bahia+volta+a+ter+horario+de+verao+apos+oito+anos.html 730 731 # From Guilherme Bernardes Rodrigues (2011-10-07): 732 # There is news in the media, however there is still no decree about it. 733 # I just send a e-mail to Zulmira Brandao at http://pcdsh01.on.br/ the 734 # official agency about time in Brazil, and she confirmed that the old rule is 735 # still in force. 736 737 # From Guilherme Bernardes Rodrigues (2011-10-14) 738 # It's official, the President signed a decree that includes Bahia in summer 739 # time. 740 # [ and in a second message (same day): ] 741 # I found the decree. 742 # 743 # DECRETO No. 7.584, DE 13 DE OUTUBRO DE 2011 744 # Link : 745 # http://www.in.gov.br/visualiza/index.jsp?data=13/10/2011&jornal=1000&pagina=6&totalArquivos=6 746 747 # From Kelley Cook (2012-10-16): 748 # The governor of state of Bahia in Brazil announced on Thursday that 749 # due to public pressure, he is reversing the DST policy they implemented 750 # last year and will not be going to Summer Time on October 21st.... 751 # http://www.correio24horas.com.br/r/artigo/apos-pressoes-wagner-suspende-horario-de-verao-na-bahia 752 753 # From Rodrigo Severo (2012-10-16): 754 # Tocantins state will have DST. 755 # https://noticias.terra.com.br/brasil/noticias/0,,OI6232536-EI306.html 756 757 # From Steffen Thorsen (2013-09-20): 758 # Tocantins in Brazil is very likely not to observe DST from October.... 759 # http://conexaoto.com.br/2013/09/18/ministerio-confirma-que-tocantins-esta-fora-do-horario-de-verao-em-2013-mas-falta-publicacao-de-decreto 760 # We will keep this article updated when this is confirmed: 761 # https://www.timeanddate.com/news/time/brazil-starts-dst-2013.html 762 763 # From Steffen Thorsen (2013-10-17): 764 # https://www.timeanddate.com/news/time/acre-amazonas-change-time-zone.html 765 # Senator Jorge Viana announced that Acre will change time zone on November 10. 766 # He did not specify the time of the change, nor if western parts of Amazonas 767 # will change as well. 768 # 769 # From Paul Eggert (2013-10-17): 770 # For now, assume western Amazonas will change as well. 771 772 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 773 # Decree 20,466 <http://pcdsh01.on.br/HV20466.htm> (1931-10-01) 774 # Decree 21,896 <http://pcdsh01.on.br/HV21896.htm> (1932-01-10) 775 Rule Brazil 1931 only - Oct 3 11:00 1:00 - 776 Rule Brazil 1932 1933 - Apr 1 0:00 0 - 777 Rule Brazil 1932 only - Oct 3 0:00 1:00 - 778 # Decree 23,195 <http://pcdsh01.on.br/HV23195.htm> (1933-10-10) 779 # revoked DST. 780 # Decree 27,496 <http://pcdsh01.on.br/HV27496.htm> (1949-11-24) 781 # Decree 27,998 <http://pcdsh01.on.br/HV27998.htm> (1950-04-13) 782 Rule Brazil 1949 1952 - Dec 1 0:00 1:00 - 783 Rule Brazil 1950 only - Apr 16 1:00 0 - 784 Rule Brazil 1951 1952 - Apr 1 0:00 0 - 785 # Decree 32,308 <http://pcdsh01.on.br/HV32308.htm> (1953-02-24) 786 Rule Brazil 1953 only - Mar 1 0:00 0 - 787 # Decree 34,724 <http://pcdsh01.on.br/HV34724.htm> (1953-11-30) 788 # revoked DST. 789 # Decree 52,700 <http://pcdsh01.on.br/HV52700.htm> (1963-10-18) 790 # established DST from 1963-10-23 00:00 to 1964-02-29 00:00 791 # in SP, RJ, GB, MG, ES, due to the prolongation of the drought. 792 # Decree 53,071 <http://pcdsh01.on.br/HV53071.htm> (1963-12-03) 793 # extended the above decree to all of the national territory on 12-09. 794 Rule Brazil 1963 only - Dec 9 0:00 1:00 - 795 # Decree 53,604 <http://pcdsh01.on.br/HV53604.htm> (1964-02-25) 796 # extended summer time by one day to 1964-03-01 00:00 (start of school). 797 Rule Brazil 1964 only - Mar 1 0:00 0 - 798 # Decree 55,639 <http://pcdsh01.on.br/HV55639.htm> (1965-01-27) 799 Rule Brazil 1965 only - Jan 31 0:00 1:00 - 800 Rule Brazil 1965 only - Mar 31 0:00 0 - 801 # Decree 57,303 <http://pcdsh01.on.br/HV57303.htm> (1965-11-22) 802 Rule Brazil 1965 only - Dec 1 0:00 1:00 - 803 # Decree 57,843 <http://pcdsh01.on.br/HV57843.htm> (1966-02-18) 804 Rule Brazil 1966 1968 - Mar 1 0:00 0 - 805 Rule Brazil 1966 1967 - Nov 1 0:00 1:00 - 806 # Decree 63,429 <http://pcdsh01.on.br/HV63429.htm> (1968-10-15) 807 # revoked DST. 808 # Decree 91,698 <http://pcdsh01.on.br/HV91698.htm> (1985-09-27) 809 Rule Brazil 1985 only - Nov 2 0:00 1:00 - 810 # Decree 92,310 (1986-01-21) 811 # Decree 92,463 (1986-03-13) 812 Rule Brazil 1986 only - Mar 15 0:00 0 - 813 # Decree 93,316 (1986-10-01) 814 Rule Brazil 1986 only - Oct 25 0:00 1:00 - 815 Rule Brazil 1987 only - Feb 14 0:00 0 - 816 # Decree 94,922 <http://pcdsh01.on.br/HV94922.htm> (1987-09-22) 817 Rule Brazil 1987 only - Oct 25 0:00 1:00 - 818 Rule Brazil 1988 only - Feb 7 0:00 0 - 819 # Decree 96,676 <http://pcdsh01.on.br/HV96676.htm> (1988-09-12) 820 # except for the states of AC, AM, PA, RR, RO, and AP (then a territory) 821 Rule Brazil 1988 only - Oct 16 0:00 1:00 - 822 Rule Brazil 1989 only - Jan 29 0:00 0 - 823 # Decree 98,077 <http://pcdsh01.on.br/HV98077.htm> (1989-08-21) 824 # with the same exceptions 825 Rule Brazil 1989 only - Oct 15 0:00 1:00 - 826 Rule Brazil 1990 only - Feb 11 0:00 0 - 827 # Decree 99,530 <http://pcdsh01.on.br/HV99530.htm> (1990-09-17) 828 # adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF. 829 # Decree 99,629 (1990-10-19) adds BA, MT. 830 Rule Brazil 1990 only - Oct 21 0:00 1:00 - 831 Rule Brazil 1991 only - Feb 17 0:00 0 - 832 # Unnumbered decree <http://pcdsh01.on.br/HV1991.htm> (1991-09-25) 833 # adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF. 834 Rule Brazil 1991 only - Oct 20 0:00 1:00 - 835 Rule Brazil 1992 only - Feb 9 0:00 0 - 836 # Unnumbered decree <http://pcdsh01.on.br/HV1992.htm> (1992-10-16) 837 # adopted by same states. 838 Rule Brazil 1992 only - Oct 25 0:00 1:00 - 839 Rule Brazil 1993 only - Jan 31 0:00 0 - 840 # Decree 942 <http://pcdsh01.on.br/HV942.htm> (1993-09-28) 841 # adopted by same states, plus AM. 842 # Decree 1,252 <http://pcdsh01.on.br/HV1252.htm> (1994-09-22; 843 # web page corrected 2004-01-07) adopted by same states, minus AM. 844 # Decree 1,636 <http://pcdsh01.on.br/HV1636.htm> (1995-09-14) 845 # adopted by same states, plus MT and TO. 846 # Decree 1,674 <http://pcdsh01.on.br/HV1674.htm> (1995-10-13) 847 # adds AL, SE. 848 Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 - 849 Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 - 850 Rule Brazil 1996 only - Feb 11 0:00 0 - 851 # Decree 2,000 <http://pcdsh01.on.br/HV2000.htm> (1996-09-04) 852 # adopted by same states, minus AL, SE. 853 Rule Brazil 1996 only - Oct 6 0:00 1:00 - 854 Rule Brazil 1997 only - Feb 16 0:00 0 - 855 # From Daniel C. Sobral (1998-02-12): 856 # In 1997, the DS began on October 6. The stated reason was that 857 # because international television networks ignored Brazil's policy on DS, 858 # they bought the wrong times on satellite for coverage of Pope's visit. 859 # This year, the ending date of DS was postponed to March 1 860 # to help dealing with the shortages of electric power. 861 # 862 # Decree 2,317 (1997-09-04), adopted by same states. 863 Rule Brazil 1997 only - Oct 6 0:00 1:00 - 864 # Decree 2,495 <http://pcdsh01.on.br/figuras/HV2495.JPG> 865 # (1998-02-10) 866 Rule Brazil 1998 only - Mar 1 0:00 0 - 867 # Decree 2,780 <http://pcdsh01.on.br/figuras/Hv98.jpg> (1998-09-11) 868 # adopted by the same states as before. 869 Rule Brazil 1998 only - Oct 11 0:00 1:00 - 870 Rule Brazil 1999 only - Feb 21 0:00 0 - 871 # Decree 3,150 <http://pcdsh01.on.br/figuras/HV3150.gif> 872 # (1999-08-23) adopted by same states. 873 # Decree 3,188 <http://pcdsh01.on.br/DecHV99.gif> (1999-09-30) 874 # adds SE, AL, PB, PE, RN, CE, PI, MA and RR. 875 Rule Brazil 1999 only - Oct 3 0:00 1:00 - 876 Rule Brazil 2000 only - Feb 27 0:00 0 - 877 # Decree 3,592 <http://pcdsh01.on.br/DEC3592.htm> (2000-09-06) 878 # adopted by the same states as before. 879 # Decree 3,630 <http://pcdsh01.on.br/Dec3630.jpg> (2000-10-13) 880 # repeals DST in PE and RR, effective 2000-10-15 00:00. 881 # Decree 3,632 <http://pcdsh01.on.br/Dec3632.jpg> (2000-10-17) 882 # repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00. 883 # Decree 3,916 <http://pcdsh01.on.br/figuras/HV3916.gif> 884 # (2001-09-13) reestablishes DST in AL, CE, MA, PB, PE, PI, RN, SE. 885 Rule Brazil 2000 2001 - Oct Sun>=8 0:00 1:00 - 886 Rule Brazil 2001 2006 - Feb Sun>=15 0:00 0 - 887 # Decree 4,399 (2002-10-01) repeals DST in AL, CE, MA, PB, PE, PI, RN, SE. 888 # 4,399 <http://www.presidencia.gov.br/CCIVIL/decreto/2002/D4399.htm> 889 Rule Brazil 2002 only - Nov 3 0:00 1:00 - 890 # Decree 4,844 (2003-09-24; corrected 2003-09-26) repeals DST in BA, MT, TO. 891 # 4,844 <http://www.presidencia.gov.br/CCIVIL/decreto/2003/D4844.htm> 892 Rule Brazil 2003 only - Oct 19 0:00 1:00 - 893 # Decree 5,223 (2004-10-01) reestablishes DST in MT. 894 # 5,223 <http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2004/Decreto/D5223.htm> 895 Rule Brazil 2004 only - Nov 2 0:00 1:00 - 896 # Decree 5,539 <http://pcdsh01.on.br/DecHV5539.gif> (2005-09-19), 897 # adopted by the same states as before. 898 Rule Brazil 2005 only - Oct 16 0:00 1:00 - 899 # Decree 5,920 <http://pcdsh01.on.br/DecHV5920.gif> (2006-10-03), 900 # adopted by the same states as before. 901 Rule Brazil 2006 only - Nov 5 0:00 1:00 - 902 Rule Brazil 2007 only - Feb 25 0:00 0 - 903 # Decree 6,212 <http://pcdsh01.on.br/DecHV6212.gif> (2007-09-26), 904 # adopted by the same states as before. 905 Rule Brazil 2007 only - Oct Sun>=8 0:00 1:00 - 906 # From Frederico A. C. Neves (2008-09-10): 907 # According to this decree 908 # http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm 909 # [t]he DST period in Brazil now on will be from the 3rd Oct Sunday to the 910 # 3rd Feb Sunday. There is an exception on the return date when this is 911 # the Carnival Sunday then the return date will be the next Sunday... 912 Rule Brazil 2008 2017 - Oct Sun>=15 0:00 1:00 - 913 Rule Brazil 2008 2011 - Feb Sun>=15 0:00 0 - 914 # Decree 7,584 <http://pcdsh01.on.br/HVdecreto7584_20111013.jpg> (2011-10-13) 915 # added Bahia. 916 Rule Brazil 2012 only - Feb Sun>=22 0:00 0 - 917 # Decree 7,826 <http://pcdsh01.on.br/HVdecreto7826_20121015.jpg> (2012-10-15) 918 # removed Bahia and added Tocantins. 919 # Decree 8,112 <http://pcdsh01.on.br/HVdecreto8112_20130930.JPG> (2013-09-30) 920 # removed Tocantins. 921 Rule Brazil 2013 2014 - Feb Sun>=15 0:00 0 - 922 Rule Brazil 2015 only - Feb Sun>=22 0:00 0 - 923 Rule Brazil 2016 2022 - Feb Sun>=15 0:00 0 - 924 # From Steffen Thorsen (2017-12-18): 925 # According to many media sources, next year's DST start in Brazil will move to 926 # the first Sunday of November, and it will stay like that for the years after. 927 # ... https://www.timeanddate.com/news/time/brazil-delays-dst-2018.html 928 # From Steffen Thorsen (2017-12-20): 929 # http://www.planalto.gov.br/ccivil_03/_ato2015-2018/2017/decreto/D9242.htm 930 # 931 # From Fbio Gomes (2018-10-04): 932 # The Brazilian president just announced a new change on this year DST. 933 # It was scheduled to start on November 4th and it was changed to November 18th. 934 # From Rodrigo Brning Wessler (2018-10-15): 935 # The Brazilian government just announced that the change in DST was 936 # canceled.... Maybe the president Michel Temer also woke up one hour 937 # earlier today. :) 938 Rule Brazil 2018 max - Nov Sun>=1 0:00 1:00 - 939 Rule Brazil 2023 only - Feb Sun>=22 0:00 0 - 940 Rule Brazil 2024 2025 - Feb Sun>=15 0:00 0 - 941 Rule Brazil 2026 only - Feb Sun>=22 0:00 0 - 942 Rule Brazil 2027 2033 - Feb Sun>=15 0:00 0 - 943 Rule Brazil 2034 only - Feb Sun>=22 0:00 0 - 944 Rule Brazil 2035 2036 - Feb Sun>=15 0:00 0 - 945 Rule Brazil 2037 only - Feb Sun>=22 0:00 0 - 946 # From Arthur David Olson (2008-09-29): 947 # The next is wrong in some years but is better than nothing. 948 Rule Brazil 2038 max - Feb Sun>=15 0:00 0 - 949 950 # The latest ruleset listed above says that the following states observe DST: 951 # DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP. 952 953 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 954 # 955 # Fernando de Noronha (administratively part of PE) 956 Zone America/Noronha -2:09:40 - LMT 1914 957 -2:00 Brazil -02/-01 1990 Sep 17 958 -2:00 - -02 1999 Sep 30 959 -2:00 Brazil -02/-01 2000 Oct 15 960 -2:00 - -02 2001 Sep 13 961 -2:00 Brazil -02/-01 2002 Oct 1 962 -2:00 - -02 963 # Other Atlantic islands have no permanent settlement. 964 # These include Trindade and Martim Vaz (administratively part of ES), 965 # Rocas Atoll (RN), and the St Peter and St Paul Archipelago (PE). 966 # Fernando de Noronha was a separate territory from 1942-09-02 to 1989-01-01; 967 # it also included the Penedos. 968 # 969 # Amap (AP), east Par (PA) 970 # East Par includes Belm, Marab, Serra Norte, and So Flix do Xingu. 971 # The division between east and west Par is the river Xingu. 972 # In the north a very small part from the river Javary (now Jari I guess, 973 # the border with Amap) to the Amazon, then to the Xingu. 974 Zone America/Belem -3:13:56 - LMT 1914 975 -3:00 Brazil -03/-02 1988 Sep 12 976 -3:00 - -03 977 # 978 # west Par (PA) 979 # West Par includes Altamira, bidos, Prainha, Oriximin, and Santarm. 980 Zone America/Santarem -3:38:48 - LMT 1914 981 -4:00 Brazil -04/-03 1988 Sep 12 982 -4:00 - -04 2008 Jun 24 0:00 983 -3:00 - -03 984 # 985 # Maranho (MA), Piau (PI), Cear (CE), Rio Grande do Norte (RN), 986 # Paraba (PB) 987 Zone America/Fortaleza -2:34:00 - LMT 1914 988 -3:00 Brazil -03/-02 1990 Sep 17 989 -3:00 - -03 1999 Sep 30 990 -3:00 Brazil -03/-02 2000 Oct 22 991 -3:00 - -03 2001 Sep 13 992 -3:00 Brazil -03/-02 2002 Oct 1 993 -3:00 - -03 994 # 995 # Pernambuco (PE) (except Atlantic islands) 996 Zone America/Recife -2:19:36 - LMT 1914 997 -3:00 Brazil -03/-02 1990 Sep 17 998 -3:00 - -03 1999 Sep 30 999 -3:00 Brazil -03/-02 2000 Oct 15 1000 -3:00 - -03 2001 Sep 13 1001 -3:00 Brazil -03/-02 2002 Oct 1 1002 -3:00 - -03 1003 # 1004 # Tocantins (TO) 1005 Zone America/Araguaina -3:12:48 - LMT 1914 1006 -3:00 Brazil -03/-02 1990 Sep 17 1007 -3:00 - -03 1995 Sep 14 1008 -3:00 Brazil -03/-02 2003 Sep 24 1009 -3:00 - -03 2012 Oct 21 1010 -3:00 Brazil -03/-02 2013 Sep 1011 -3:00 - -03 1012 # 1013 # Alagoas (AL), Sergipe (SE) 1014 Zone America/Maceio -2:22:52 - LMT 1914 1015 -3:00 Brazil -03/-02 1990 Sep 17 1016 -3:00 - -03 1995 Oct 13 1017 -3:00 Brazil -03/-02 1996 Sep 4 1018 -3:00 - -03 1999 Sep 30 1019 -3:00 Brazil -03/-02 2000 Oct 22 1020 -3:00 - -03 2001 Sep 13 1021 -3:00 Brazil -03/-02 2002 Oct 1 1022 -3:00 - -03 1023 # 1024 # Bahia (BA) 1025 # There are too many Salvadors elsewhere, so use America/Bahia instead 1026 # of America/Salvador. 1027 Zone America/Bahia -2:34:04 - LMT 1914 1028 -3:00 Brazil -03/-02 2003 Sep 24 1029 -3:00 - -03 2011 Oct 16 1030 -3:00 Brazil -03/-02 2012 Oct 21 1031 -3:00 - -03 1032 # 1033 # Gois (GO), Distrito Federal (DF), Minas Gerais (MG), 1034 # Esprito Santo (ES), Rio de Janeiro (RJ), So Paulo (SP), Paran (PR), 1035 # Santa Catarina (SC), Rio Grande do Sul (RS) 1036 Zone America/Sao_Paulo -3:06:28 - LMT 1914 1037 -3:00 Brazil -03/-02 1963 Oct 23 0:00 1038 -3:00 1:00 -02 1964 1039 -3:00 Brazil -03/-02 1040 # 1041 # Mato Grosso do Sul (MS) 1042 Zone America/Campo_Grande -3:38:28 - LMT 1914 1043 -4:00 Brazil -04/-03 1044 # 1045 # Mato Grosso (MT) 1046 Zone America/Cuiaba -3:44:20 - LMT 1914 1047 -4:00 Brazil -04/-03 2003 Sep 24 1048 -4:00 - -04 2004 Oct 1 1049 -4:00 Brazil -04/-03 1050 # 1051 # Rondnia (RO) 1052 Zone America/Porto_Velho -4:15:36 - LMT 1914 1053 -4:00 Brazil -04/-03 1988 Sep 12 1054 -4:00 - -04 1055 # 1056 # Roraima (RR) 1057 Zone America/Boa_Vista -4:02:40 - LMT 1914 1058 -4:00 Brazil -04/-03 1988 Sep 12 1059 -4:00 - -04 1999 Sep 30 1060 -4:00 Brazil -04/-03 2000 Oct 15 1061 -4:00 - -04 1062 # 1063 # east Amazonas (AM): Boca do Acre, Juta, Manaus, Floriano Peixoto 1064 # The great circle line from Tabatinga to Porto Acre divides 1065 # east from west Amazonas. 1066 Zone America/Manaus -4:00:04 - LMT 1914 1067 -4:00 Brazil -04/-03 1988 Sep 12 1068 -4:00 - -04 1993 Sep 28 1069 -4:00 Brazil -04/-03 1994 Sep 22 1070 -4:00 - -04 1071 # 1072 # west Amazonas (AM): Atalaia do Norte, Boca do Maoco, Benjamin Constant, 1073 # Eirunep, Envira, Ipixuna 1074 Zone America/Eirunepe -4:39:28 - LMT 1914 1075 -5:00 Brazil -05/-04 1988 Sep 12 1076 -5:00 - -05 1993 Sep 28 1077 -5:00 Brazil -05/-04 1994 Sep 22 1078 -5:00 - -05 2008 Jun 24 0:00 1079 -4:00 - -04 2013 Nov 10 1080 -5:00 - -05 1081 # 1082 # Acre (AC) 1083 Zone America/Rio_Branco -4:31:12 - LMT 1914 1084 -5:00 Brazil -05/-04 1988 Sep 12 1085 -5:00 - -05 2008 Jun 24 0:00 1086 -4:00 - -04 2013 Nov 10 1087 -5:00 - -05 1088 1089 # Chile 1090 1091 # From Paul Eggert (2015-04-03): 1092 # Shanks & Pottenger says America/Santiago introduced standard time in 1093 # 1890 and rounds its UT offset to 70W40; guess that in practice this 1094 # was the same offset as in 1916-1919. It also says Pacific/Easter 1095 # standardized on 109W22 in 1890; assume this didn't change the clocks. 1096 # 1097 # Dates for America/Santiago from 1910 to 2004 are primarily from 1098 # the following source, cited by Oscar van Vlijmen (2006-10-08): 1099 # [1] Chile Law 1100 # http://www.webexhibits.org/daylightsaving/chile.html 1101 # This contains a copy of this official table: 1102 # Cambios en la hora oficial de Chile desde 1900 (retrieved 2008-03-30) 1103 # https://web.archive.org/web/20080330200901/http://www.horaoficial.cl/cambio.htm 1104 # [1] needs several corrections, though. 1105 # 1106 # The first set of corrections is from: 1107 # [2] History of the Official Time of Chile 1108 # http://www.horaoficial.cl/ing/horaof_ing.html (retrieved 2012-03-06). See: 1109 # https://web.archive.org/web/20120306042032/http://www.horaoficial.cl/ing/horaof_ing.html 1110 # This is an English translation of: 1111 # Historia de la hora oficial de Chile (retrieved 2012-10-24). See: 1112 # https://web.archive.org/web/20121024234627/http://www.horaoficial.cl/horaof.htm 1113 # A fancier Spanish version (requiring mouse-clicking) is at: 1114 # http://www.horaoficial.cl/historia_hora.html 1115 # Conflicts between [1] and [2] were resolved as follows: 1116 # 1117 # - [1] says the 1910 transition was Jan 1, [2] says Jan 10 and cites 1118 # Boletn No. 1, Aviso No. 1 (1910). Go with [2]. 1119 # 1120 # - [1] says SMT was -4:42:45, [2] says Chile's official time from 1121 # 1916 to 1919 was -4:42:46.3, the meridian of Chile's National 1122 # Astronomical Observatory (OAN), then located in what is now 1123 # Quinta Normal in Santiago. Go with [2], rounding it to -4:42:46. 1124 # 1125 # - [1] says the 1918 transition was Sep 1, [2] says Sep 10 and cites 1126 # Boletn No. 22, Aviso No. 129/1918 (1918-08-23). Go with [2]. 1127 # 1128 # - [1] does not give times for transitions; assume they occur 1129 # at midnight mainland time, the current common practice. However, 1130 # go with [2]'s specification of 23:00 for the 1947-05-21 transition. 1131 # 1132 # Another correction to [1] is from Jesper Nrgaard Welen, who 1133 # wrote (2006-10-08), "I think that there are some obvious mistakes in 1134 # the suggested link from Oscar van Vlijmen,... for instance entry 66 1135 # says that GMT-4 ended 1990-09-12 while entry 67 only begins GMT-3 at 1136 # 1990-09-15 (they should have been 1990-09-15 and 1990-09-16 1137 # respectively), but anyhow it clears up some doubts too." 1138 # 1139 # Data for Pacific/Easter from 1910 through 1967 come from Shanks & 1140 # Pottenger. After that, for lack of better info assume 1141 # Pacific/Easter is always two hours behind America/Santiago; 1142 # this is known to work for DST transitions starting in 2008 and 1143 # may well be true for earlier transitions. 1144 1145 # From Eduardo Krell (1995-10-19): 1146 # The law says to switch to DST at midnight [24:00] on the second SATURDAY 1147 # of October.... The law is the same for March and October. 1148 # (1998-09-29): 1149 # Because of the drought this year, the government decided to go into 1150 # DST earlier (saturday 9/26 at 24:00). This is a one-time change only ... 1151 # (unless there's another dry season next year, I guess). 1152 1153 # From Julio I. Pacheco Troncoso (1999-03-18): 1154 # Because of the same drought, the government decided to end DST later, 1155 # on April 3, (one-time change). 1156 1157 # From Germn Poo-Caamao (2008-03-03): 1158 # Due to drought, Chile extends Daylight Time in three weeks. This 1159 # is one-time change (Saturday 3/29 at 24:00 for America/Santiago 1160 # and Saturday 3/29 at 22:00 for Pacific/Easter) 1161 # The Supreme Decree is located at 1162 # http://www.shoa.cl/servicios/supremo316.pdf 1163 # 1164 # From Jos Miguel Garrido (2008-03-05): 1165 # http://www.shoa.cl/noticias/2008/04hora/hora.htm 1166 1167 # From Angel Chiang (2010-03-04): 1168 # Subject: DST in Chile exceptionally extended to 3 April due to earthquake 1169 # http://www.gobiernodechile.cl/viewNoticia.aspx?idArticulo=30098 1170 # 1171 # From Arthur David Olson (2010-03-06): 1172 # Angel Chiang's message confirmed by Julio Pacheco; Julio provided a patch. 1173 1174 # From Glenn Eychaner (2011-03-28): 1175 # http://diario.elmercurio.com/2011/03/28/_portada/_portada/noticias/7565897A-CA86-49E6-9E03-660B21A4883E.htm?id=3D{7565897A-CA86-49E6-9E03-660B21A4883E} 1176 # In English: 1177 # Chile's clocks will go back an hour this year on the 7th of May instead 1178 # of this Saturday. They will go forward again the 3rd Saturday in 1179 # August, not in October as they have since 1968. 1180 1181 # From Mauricio Parada (2012-02-22), translated by Glenn Eychaner (2012-02-23): 1182 # As stated in the website of the Chilean Energy Ministry 1183 # http://www.minenergia.cl/ministerio/noticias/generales/gobierno-anuncia-fechas-de-cambio-de.html 1184 # The Chilean Government has decided to postpone the entrance into winter time 1185 # (to leave DST) from March 11 2012 to April 28th 2012.... 1186 # Quote from the website communication: 1187 # 1188 # 6. For the year 2012, the dates of entry into winter time will be as follows: 1189 # a. Saturday April 28, 2012, clocks should go back 60 minutes; that is, at 1190 # 23:59:59, instead of passing to 0:00, the time should be adjusted to be 23:00 1191 # of the same day. 1192 # b. Saturday, September 1, 2012, clocks should go forward 60 minutes; that is, 1193 # at 23:59:59, instead of passing to 0:00, the time should be adjusted to be 1194 # 01:00 on September 2. 1195 1196 # From Steffen Thorsen (2013-02-15): 1197 # According to several news sources, Chile has extended DST this year, 1198 # they will end DST later and start DST earlier than planned. They 1199 # hope to save energy. The new end date is 2013-04-28 00:00 and new 1200 # start date is 2013-09-08 00:00.... 1201 # http://www.gob.cl/informa/2013/02/15/gobierno-anuncia-fechas-de-cambio-de-hora-para-el-ano-2013.htm 1202 1203 # From Jos Miguel Garrido (2014-02-19): 1204 # Today appeared in the Diario Oficial a decree amending the time change 1205 # dates to 2014. 1206 # DST End: last Saturday of April 2014 (Sun 27 Apr 2014 03:00 UTC) 1207 # DST Start: first Saturday of September 2014 (Sun 07 Sep 2014 04:00 UTC) 1208 # http://www.diariooficial.interior.gob.cl//media/2014/02/19/do-20140219.pdf 1209 1210 # From Eduardo Romero Urra (2015-03-03): 1211 # Today has been published officially that Chile will use the DST time 1212 # permanently until March 25 of 2017 1213 # http://www.diariooficial.interior.gob.cl/media/2015/03/03/1-large.jpg 1214 # 1215 # From Paul Eggert (2015-03-03): 1216 # For now, assume that the extension will persist indefinitely. 1217 1218 # From Juan Correa (2016-03-18): 1219 # The decree regarding DST has been published in today's Official Gazette: 1220 # http://www.diariooficial.interior.gob.cl/versiones-anteriores/do/20160318/ 1221 # http://www.leychile.cl/Navegar?idNorma=1088502 1222 # It does consider the second Saturday of May and August as the dates 1223 # for the transition; and it lists DST dates until 2019, but I think 1224 # this scheme will stick. 1225 # 1226 # From Paul Eggert (2016-03-18): 1227 # For now, assume the pattern holds for the indefinite future. 1228 # The decree says transitions occur at 24:00; in practice this appears 1229 # to mean 24:00 mainland time, not 24:00 local time, so that Easter 1230 # Island is always two hours behind the mainland. 1231 1232 # From Juan Correa (2016-12-04): 1233 # Magallanes region ... will keep DST (UTC -3) all year round.... 1234 # http://www.soychile.cl/Santiago/Sociedad/2016/12/04/433428/Bachelet-firmo-el-decreto-para-establecer-un-horario-unico-para-la-Region-de-Magallanes.aspx 1235 # 1236 # From Deborah Goldsmith (2017-01-19): 1237 # http://www.diariooficial.interior.gob.cl/publicaciones/2017/01/17/41660/01/1169626.pdf 1238 # From Paul Eggert (2017-01-19): 1239 # The above says the Magallanes change expires 2019-05-11 at 24:00, 1240 # so in theory, they will revert to -04/-03 after that, which means 1241 # they will switch from -03 to -04 one hour after Santiago does that day. 1242 # For now, assume that they will not revert. 1243 1244 # From Juan Correa (2018-08-13): 1245 # As of moments ago, the Ministry of Energy in Chile has announced the new 1246 # schema for DST. ... Announcement in video (in Spanish): 1247 # https://twitter.com/MinEnergia/status/1029000399129374720 1248 # From Yonathan Dossow (2018-08-13): 1249 # The video says "first Saturday of September", we all know it means Sunday at 1250 # midnight. 1251 # From Tim Parenti (2018-08-13): 1252 # Translating the captions on the video at 0:44-0:55, "We want to announce as 1253 # Government that from 2019, Winter Time will be increased to 5 months, between 1254 # the first Saturday of April and the first Saturday of September." 1255 # At 2:08-2:20, "The Magallanes region will maintain its current time, as 1256 # decided by the citizens during 2017, but our Government will promote a 1257 # regional dialogue table to gather their opinion on this matter." 1258 # https://twitter.com/MinEnergia/status/1029009354001973248 1259 # "We will keep the new time policy unchanged for at least the next 4 years." 1260 # So we extend the new rules on Saturdays at 24:00 mainland time indefinitely. 1261 1262 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1263 Rule Chile 1927 1931 - Sep 1 0:00 1:00 - 1264 Rule Chile 1928 1932 - Apr 1 0:00 0 - 1265 Rule Chile 1968 only - Nov 3 4:00u 1:00 - 1266 Rule Chile 1969 only - Mar 30 3:00u 0 - 1267 Rule Chile 1969 only - Nov 23 4:00u 1:00 - 1268 Rule Chile 1970 only - Mar 29 3:00u 0 - 1269 Rule Chile 1971 only - Mar 14 3:00u 0 - 1270 Rule Chile 1970 1972 - Oct Sun>=9 4:00u 1:00 - 1271 Rule Chile 1972 1986 - Mar Sun>=9 3:00u 0 - 1272 Rule Chile 1973 only - Sep 30 4:00u 1:00 - 1273 Rule Chile 1974 1987 - Oct Sun>=9 4:00u 1:00 - 1274 Rule Chile 1987 only - Apr 12 3:00u 0 - 1275 Rule Chile 1988 1990 - Mar Sun>=9 3:00u 0 - 1276 Rule Chile 1988 1989 - Oct Sun>=9 4:00u 1:00 - 1277 Rule Chile 1990 only - Sep 16 4:00u 1:00 - 1278 Rule Chile 1991 1996 - Mar Sun>=9 3:00u 0 - 1279 Rule Chile 1991 1997 - Oct Sun>=9 4:00u 1:00 - 1280 Rule Chile 1997 only - Mar 30 3:00u 0 - 1281 Rule Chile 1998 only - Mar Sun>=9 3:00u 0 - 1282 Rule Chile 1998 only - Sep 27 4:00u 1:00 - 1283 Rule Chile 1999 only - Apr 4 3:00u 0 - 1284 Rule Chile 1999 2010 - Oct Sun>=9 4:00u 1:00 - 1285 Rule Chile 2000 2007 - Mar Sun>=9 3:00u 0 - 1286 # N.B.: the end of March 29 in Chile is March 30 in Universal time, 1287 # which is used below in specifying the transition. 1288 Rule Chile 2008 only - Mar 30 3:00u 0 - 1289 Rule Chile 2009 only - Mar Sun>=9 3:00u 0 - 1290 Rule Chile 2010 only - Apr Sun>=1 3:00u 0 - 1291 Rule Chile 2011 only - May Sun>=2 3:00u 0 - 1292 Rule Chile 2011 only - Aug Sun>=16 4:00u 1:00 - 1293 Rule Chile 2012 2014 - Apr Sun>=23 3:00u 0 - 1294 Rule Chile 2012 2014 - Sep Sun>=2 4:00u 1:00 - 1295 Rule Chile 2016 2018 - May Sun>=9 3:00u 0 - 1296 Rule Chile 2016 2018 - Aug Sun>=9 4:00u 1:00 - 1297 Rule Chile 2019 max - Apr Sun>=2 3:00u 0 - 1298 Rule Chile 2019 max - Sep Sun>=2 4:00u 1:00 - 1299 # IATA SSIM anomalies: (1992-02) says 1992-03-14; 1300 # (1996-09) says 1998-03-08. Ignore these. 1301 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1302 Zone America/Santiago -4:42:46 - LMT 1890 1303 -4:42:46 - SMT 1910 Jan 10 # Santiago Mean Time 1304 -5:00 - -05 1916 Jul 1 1305 -4:42:46 - SMT 1918 Sep 10 1306 -4:00 - -04 1919 Jul 1 1307 -4:42:46 - SMT 1927 Sep 1 1308 -5:00 Chile -05/-04 1932 Sep 1 1309 -4:00 - -04 1942 Jun 1 1310 -5:00 - -05 1942 Aug 1 1311 -4:00 - -04 1946 Jul 15 1312 -4:00 1:00 -03 1946 Sep 1 # central Chile 1313 -4:00 - -04 1947 Apr 1 1314 -5:00 - -05 1947 May 21 23:00 1315 -4:00 Chile -04/-03 1316 Zone America/Punta_Arenas -4:43:40 - LMT 1890 1317 -4:42:46 - SMT 1910 Jan 10 1318 -5:00 - -05 1916 Jul 1 1319 -4:42:46 - SMT 1918 Sep 10 1320 -4:00 - -04 1919 Jul 1 1321 -4:42:46 - SMT 1927 Sep 1 1322 -5:00 Chile -05/-04 1932 Sep 1 1323 -4:00 - -04 1942 Jun 1 1324 -5:00 - -05 1942 Aug 1 1325 -4:00 - -04 1947 Apr 1 1326 -5:00 - -05 1947 May 21 23:00 1327 -4:00 Chile -04/-03 2016 Dec 4 1328 -3:00 - -03 1329 Zone Pacific/Easter -7:17:28 - LMT 1890 1330 -7:17:28 - EMT 1932 Sep # Easter Mean Time 1331 -7:00 Chile -07/-06 1982 Mar 14 3:00u # Easter Time 1332 -6:00 Chile -06/-05 1333 # 1334 # Salas y Gmez Island is uninhabited. 1335 # Other Chilean locations, including Juan Fernndez Is, Desventuradas Is, 1336 # and Antarctic bases, are like America/Santiago. 1337 1338 # Antarctic base using South American rules 1339 # (See the file 'antarctica' for more.) 1340 # 1341 # Palmer, Anvers Island, since 1965 (moved 2 miles in 1968) 1342 # 1343 # From Ethan Dicks (1996-10-06): 1344 # It keeps the same time as Punta Arenas, Chile, because, just like us 1345 # and the South Pole, that's the other end of their supply line.... 1346 # I verified with someone who was there that since 1980, 1347 # Palmer has followed Chile. Prior to that, before the Falklands War, 1348 # Palmer used to be supplied from Argentina. 1349 # 1350 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1351 Zone Antarctica/Palmer 0 - -00 1965 1352 -4:00 Arg -04/-03 1969 Oct 5 1353 -3:00 Arg -03/-02 1982 May 1354 -4:00 Chile -04/-03 2016 Dec 4 1355 -3:00 - -03 1356 1357 # Colombia 1358 1359 # Milne gives 4:56:16.4 for Bogot time in 1899; round to nearest. He writes, 1360 # "A variation of fifteen minutes in the public clocks of Bogota is not rare." 1361 1362 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1363 Rule CO 1992 only - May 3 0:00 1:00 - 1364 Rule CO 1993 only - Apr 4 0:00 0 - 1365 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1366 Zone America/Bogota -4:56:16 - LMT 1884 Mar 13 1367 -4:56:16 - BMT 1914 Nov 23 # Bogot Mean Time 1368 -5:00 CO -05/-04 1369 # Malpelo, Providencia, San Andres 1370 # no information; probably like America/Bogota 1371 1372 # Curaao 1373 1374 # Milne gives 4:35:46.9 for Curaao mean time; round to nearest. 1375 # 1376 # From Paul Eggert (2006-03-22): 1377 # Shanks & Pottenger say that The Bottom and Philipsburg have been at 1378 # -4:00 since standard time was introduced on 1912-03-02; and that 1379 # Kralendijk and Rincon used Kralendijk Mean Time (-4:33:08) from 1380 # 1912-02-02 to 1965-01-01. The former is dubious, since S&P also say 1381 # Saba Island has been like Curaao. 1382 # This all predates our 1970 cutoff, though. 1383 # 1384 # By July 2007 Curaao and St Maarten are planned to become 1385 # associated states within the Netherlands, much like Aruba; 1386 # Bonaire, Saba and St Eustatius would become directly part of the 1387 # Netherlands as Kingdom Islands. This won't affect their time zones 1388 # though, as far as we know. 1389 # 1390 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1391 Zone America/Curacao -4:35:47 - LMT 1912 Feb 12 # Willemstad 1392 -4:30 - -0430 1965 1393 -4:00 - AST 1394 1395 # From Arthur David Olson (2011-06-15): 1396 # use links for places with new iso3166 codes. 1397 # The name "Lower Prince's Quarter" is both longer than fourteen characters 1398 # and contains an apostrophe; use "Lower_Princes" below. 1399 1400 Link America/Curacao America/Lower_Princes # Sint Maarten 1401 Link America/Curacao America/Kralendijk # Caribbean Netherlands 1402 1403 # Ecuador 1404 # 1405 # Milne says the Central and South American Telegraph Company used -5:24:15. 1406 # 1407 # From Alois Treindl (2016-12-15): 1408 # https://www.elcomercio.com/actualidad/hora-sixto-1993.html 1409 # ... Whether the law applied also to Galpagos, I do not know. 1410 # From Paul Eggert (2016-12-15): 1411 # https://www.elcomercio.com/afull/modificacion-husohorario-ecuador-presidentes-decreto.html 1412 # This says President Sixto Durn Balln signed decree No. 285, which 1413 # established DST from 1992-11-28 to 1993-02-05; it does not give transition 1414 # times. The people called it "hora de Sixto" ("Sixto hour"). The change did 1415 # not go over well; a popular song "Qu hora es" by Jaime Guevara had lyrics 1416 # that included "Amaneca en mitad de la noche, los guaguas iban a clase sin 1417 # sol" ("It was dawning in the middle of the night, the buses went to class 1418 # without sun"). Although Balln's campaign slogan was "Ni un paso atrs" 1419 # (Not one step back), the clocks went back in 1993 and the experiment was not 1420 # repeated. For now, assume transitions were at 00:00 local time country-wide. 1421 # 1422 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1423 Rule Ecuador 1992 only - Nov 28 0:00 1:00 - 1424 Rule Ecuador 1993 only - Feb 5 0:00 0 - 1425 # 1426 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1427 Zone America/Guayaquil -5:19:20 - LMT 1890 1428 -5:14:00 - QMT 1931 # Quito Mean Time 1429 -5:00 Ecuador -05/-04 1430 Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno 1431 -5:00 - -05 1986 1432 -6:00 Ecuador -06/-05 1433 1434 # Falklands 1435 1436 # From Paul Eggert (2006-03-22): 1437 # Between 1990 and 2000 inclusive, Shanks & Pottenger and the IATA agree except 1438 # the IATA gives 1996-09-08. Go with Shanks & Pottenger. 1439 1440 # From Falkland Islands Government Office, London (2001-01-22) 1441 # via Jesper Nrgaard: 1442 # ... the clocks revert back to Local Mean Time at 2 am on Sunday 15 1443 # April 2001 and advance one hour to summer time at 2 am on Sunday 2 1444 # September. It is anticipated that the clocks will revert back at 2 1445 # am on Sunday 21 April 2002 and advance to summer time at 2 am on 1446 # Sunday 1 September. 1447 1448 # From Rives McDow (2001-02-13): 1449 # 1450 # I have communicated several times with people there, and the last 1451 # time I had communications that was helpful was in 1998. Here is 1452 # what was said then: 1453 # 1454 # "The general rule was that Stanley used daylight saving and the Camp 1455 # did not. However for various reasons many people in the Camp have 1456 # started to use daylight saving (known locally as 'Stanley Time') 1457 # There is no rule as to who uses daylight saving - it is a matter of 1458 # personal choice and so it is impossible to draw a map showing who 1459 # uses it and who does not. Any list would be out of date as soon as 1460 # it was produced. This year daylight saving ended on April 18/19th 1461 # and started again on September 12/13th. I do not know what the rule 1462 # is, but can find out if you like. We do not change at the same time 1463 # as UK or Chile." 1464 # 1465 # I did have in my notes that the rule was "Second Saturday in Sep at 1466 # 0:00 until third Saturday in Apr at 0:00". I think that this does 1467 # not agree in some cases with Shanks; is this true? 1468 # 1469 # Also, there is no mention in the list that some areas in the 1470 # Falklands do not use DST. I have found in my communications there 1471 # that these areas are on the western half of East Falkland and all of 1472 # West Falkland. Stanley is the only place that consistently observes 1473 # DST. Again, as in other places in the world, the farmers don't like 1474 # it. West Falkland is almost entirely sheep farmers. 1475 # 1476 # I know one lady there that keeps a list of which farm keeps DST and 1477 # which doesn't each year. She runs a shop in Stanley, and says that 1478 # the list changes each year. She uses it to communicate to her 1479 # customers, catching them when they are home for lunch or dinner. 1480 1481 # From Paul Eggert (2001-03-05): 1482 # For now, we'll just record the time in Stanley, since we have no 1483 # better info. 1484 1485 # From Steffen Thorsen (2011-04-01): 1486 # The Falkland Islands will not turn back clocks this winter, but stay on 1487 # daylight saving time. 1488 # 1489 # One source: 1490 # http://www.falklandnews.com/public/story.cfm?get=5914&source=3 1491 # 1492 # We have gotten this confirmed by a clerk of the legislative assembly: 1493 # Normally the clocks revert to Local Mean Time (UTC/GMT -4 hours) on the 1494 # third Sunday of April at 0200hrs and advance to Summer Time (UTC/GMT -3 1495 # hours) on the first Sunday of September at 0200hrs. 1496 # 1497 # IMPORTANT NOTE: During 2011, on a trial basis, the Falkland Islands 1498 # will not revert to local mean time, but clocks will remain on Summer 1499 # time (UTC/GMT - 3 hours) throughout the whole of 2011. Any long term 1500 # change to local time following the trial period will be notified. 1501 # 1502 # From Andrew Newman (2012-02-24) 1503 # A letter from Justin McPhee, Chief Executive, 1504 # Cable & Wireless Falkland Islands (dated 2012-02-22) 1505 # states... 1506 # The current Atlantic/Stanley entry under South America expects the 1507 # clocks to go back to standard Falklands Time (FKT) on the 15th April. 1508 # The database entry states that in 2011 Stanley was staying on fixed 1509 # summer time on a trial basis only. FIG need to contact IANA and/or 1510 # the maintainers of the database to inform them we're adopting 1511 # the same policy this year and suggest recommendations for future years. 1512 # 1513 # For now we will assume permanent -03 for the Falklands 1514 # until advised differently (to apply for 2012 and beyond, after the 2011 1515 # experiment was apparently successful.) 1516 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1517 Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 - 1518 Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 - 1519 Rule Falk 1939 only - Oct 1 0:00 1:00 - 1520 Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 - 1521 Rule Falk 1943 only - Jan 1 0:00 0 - 1522 Rule Falk 1983 only - Sep lastSun 0:00 1:00 - 1523 Rule Falk 1984 1985 - Apr lastSun 0:00 0 - 1524 Rule Falk 1984 only - Sep 16 0:00 1:00 - 1525 Rule Falk 1985 2000 - Sep Sun>=9 0:00 1:00 - 1526 Rule Falk 1986 2000 - Apr Sun>=16 0:00 0 - 1527 Rule Falk 2001 2010 - Apr Sun>=15 2:00 0 - 1528 Rule Falk 2001 2010 - Sep Sun>=1 2:00 1:00 - 1529 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1530 Zone Atlantic/Stanley -3:51:24 - LMT 1890 1531 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time 1532 -4:00 Falk -04/-03 1983 May 1533 -3:00 Falk -03/-02 1985 Sep 15 1534 -4:00 Falk -04/-03 2010 Sep 5 2:00 1535 -3:00 - -03 1536 1537 # French Guiana 1538 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1539 Zone America/Cayenne -3:29:20 - LMT 1911 Jul 1540 -4:00 - -04 1967 Oct 1541 -3:00 - -03 1542 1543 # Guyana 1544 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1545 Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown 1546 -3:45 - -0345 1975 Jul 31 1547 -3:00 - -03 1991 1548 # IATA SSIM (1996-06) says -4:00. Assume a 1991 switch. 1549 -4:00 - -04 1550 1551 # Paraguay 1552 # 1553 # From Paul Eggert (2006-03-22): 1554 # Shanks & Pottenger say that spring transitions are 01:00 -> 02:00, 1555 # and autumn transitions are 00:00 -> 23:00. Go with pre-1999 1556 # editions of Shanks, and with the IATA, who say transitions occur at 00:00. 1557 # 1558 # From Waldemar Villamayor-Venialbo (2013-09-20): 1559 # No time of the day is established for the adjustment, so people normally 1560 # adjust their clocks at 0 hour of the given dates. 1561 # 1562 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1563 Rule Para 1975 1988 - Oct 1 0:00 1:00 - 1564 Rule Para 1975 1978 - Mar 1 0:00 0 - 1565 Rule Para 1979 1991 - Apr 1 0:00 0 - 1566 Rule Para 1989 only - Oct 22 0:00 1:00 - 1567 Rule Para 1990 only - Oct 1 0:00 1:00 - 1568 Rule Para 1991 only - Oct 6 0:00 1:00 - 1569 Rule Para 1992 only - Mar 1 0:00 0 - 1570 Rule Para 1992 only - Oct 5 0:00 1:00 - 1571 Rule Para 1993 only - Mar 31 0:00 0 - 1572 Rule Para 1993 1995 - Oct 1 0:00 1:00 - 1573 Rule Para 1994 1995 - Feb lastSun 0:00 0 - 1574 Rule Para 1996 only - Mar 1 0:00 0 - 1575 # IATA SSIM (2000-02) says 1999-10-10; ignore this for now. 1576 # From Steffen Thorsen (2000-10-02): 1577 # I have three independent reports that Paraguay changed to DST this Sunday 1578 # (10-01). 1579 # 1580 # Translated by Gwillim Law (2001-02-27) from 1581 # Noticias, a daily paper in Asuncin, Paraguay (2000-10-01): 1582 # http://www.diarionoticias.com.py/011000/nacional/naciona1.htm 1583 # Starting at 0:00 today, the clock will be set forward 60 minutes, in 1584 # fulfillment of Decree No. 7,273 of the Executive Power.... The time change 1585 # system has been operating for several years. Formerly there was a separate 1586 # decree each year; the new law has the same effect, but permanently. Every 1587 # year, the time will change on the first Sunday of October; likewise, the 1588 # clock will be set back on the first Sunday of March. 1589 # 1590 Rule Para 1996 2001 - Oct Sun>=1 0:00 1:00 - 1591 # IATA SSIM (1997-09) says Mar 1; go with Shanks & Pottenger. 1592 Rule Para 1997 only - Feb lastSun 0:00 0 - 1593 # Shanks & Pottenger say 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but 1594 # (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27). 1595 Rule Para 1998 2001 - Mar Sun>=1 0:00 0 - 1596 # From Rives McDow (2002-02-28): 1597 # A decree was issued in Paraguay (No. 16350) on 2002-02-26 that changed the 1598 # dst method to be from the first Sunday in September to the first Sunday in 1599 # April. 1600 Rule Para 2002 2004 - Apr Sun>=1 0:00 0 - 1601 Rule Para 2002 2003 - Sep Sun>=1 0:00 1:00 - 1602 # 1603 # From Jesper Nrgaard Welen (2005-01-02): 1604 # There are several sources that claim that Paraguay made 1605 # a timezone rule change in autumn 2004. 1606 # From Steffen Thorsen (2005-01-05): 1607 # Decree 1,867 (2004-03-05) 1608 # From Carlos Ral Perasso via Jesper Nrgaard Welen (2006-10-13) 1609 # http://www.presidencia.gov.py/decretos/D1867.pdf 1610 Rule Para 2004 2009 - Oct Sun>=15 0:00 1:00 - 1611 Rule Para 2005 2009 - Mar Sun>=8 0:00 0 - 1612 # From Carlos Ral Perasso (2010-02-18): 1613 # By decree number 3958 issued yesterday 1614 # http://www.presidencia.gov.py/v1/wp-content/uploads/2010/02/decreto3958.pdf 1615 # Paraguay changes its DST schedule, postponing the March rule to April and 1616 # modifying the October date. The decree reads: 1617 # ... 1618 # Art. 1. It is hereby established that from the second Sunday of the month of 1619 # April of this year (2010), the official time is to be set back 60 minutes, 1620 # and that on the first Sunday of the month of October, it is to be set 1621 # forward 60 minutes, in all the territory of the Paraguayan Republic. 1622 # ... 1623 Rule Para 2010 max - Oct Sun>=1 0:00 1:00 - 1624 Rule Para 2010 2012 - Apr Sun>=8 0:00 0 - 1625 # 1626 # From Steffen Thorsen (2013-03-07): 1627 # Paraguay will end DST on 2013-03-24 00:00.... 1628 # http://www.ande.gov.py/interna.php?id=1075 1629 # 1630 # From Carlos Ral Perasso (2013-03-15): 1631 # The change in Paraguay is now final. Decree number 10780 1632 # http://www.presidencia.gov.py/uploads/pdf/presidencia-3b86ff4b691c79d4f5927ca964922ec74772ce857c02ca054a52a37b49afc7fb.pdf 1633 # From Carlos Ral Perasso (2014-02-28): 1634 # Decree 1264 can be found at: 1635 # http://www.presidencia.gov.py/archivos/documentos/DECRETO1264_ey9r8zai.pdf 1636 Rule Para 2013 max - Mar Sun>=22 0:00 0 - 1637 1638 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1639 Zone America/Asuncion -3:50:40 - LMT 1890 1640 -3:50:40 - AMT 1931 Oct 10 # Asuncin Mean Time 1641 -4:00 - -04 1972 Oct 1642 -3:00 - -03 1974 Apr 1643 -4:00 Para -04/-03 1644 1645 # Peru 1646 # 1647 # From Evelyn C. Leeper via Mark Brader (2003-10-26) 1648 # <news:xrGmb.39935$gA1.13896113 (a] news4.srv.hcvlny.cv.net>: 1649 # When we were in Peru in 1985-1986, they apparently switched over 1650 # sometime between December 29 and January 3 while we were on the Amazon. 1651 # 1652 # From Paul Eggert (2006-03-22): 1653 # Shanks & Pottenger don't have this transition. Assume 1986 was like 1987. 1654 1655 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1656 Rule Peru 1938 only - Jan 1 0:00 1:00 - 1657 Rule Peru 1938 only - Apr 1 0:00 0 - 1658 Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 - 1659 Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 - 1660 Rule Peru 1986 1987 - Jan 1 0:00 1:00 - 1661 Rule Peru 1986 1987 - Apr 1 0:00 0 - 1662 Rule Peru 1990 only - Jan 1 0:00 1:00 - 1663 Rule Peru 1990 only - Apr 1 0:00 0 - 1664 # IATA is ambiguous for 1993/1995; go with Shanks & Pottenger. 1665 Rule Peru 1994 only - Jan 1 0:00 1:00 - 1666 Rule Peru 1994 only - Apr 1 0:00 0 - 1667 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1668 Zone America/Lima -5:08:12 - LMT 1890 1669 -5:08:36 - LMT 1908 Jul 28 # Lima Mean Time? 1670 -5:00 Peru -05/-04 1671 1672 # South Georgia 1673 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1674 Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken 1675 -2:00 - -02 1676 1677 # South Sandwich Is 1678 # uninhabited; scientific personnel have wintered 1679 1680 # Suriname 1681 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1682 Zone America/Paramaribo -3:40:40 - LMT 1911 1683 -3:40:52 - PMT 1935 # Paramaribo Mean Time 1684 -3:40:36 - PMT 1945 Oct # The capital moved? 1685 -3:30 - -0330 1984 Oct 1686 -3:00 - -03 1687 1688 # Trinidad and Tobago 1689 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1690 Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2 1691 -4:00 - AST 1692 1693 # These all agree with Trinidad and Tobago since 1970. 1694 Link America/Port_of_Spain America/Anguilla 1695 Link America/Port_of_Spain America/Antigua 1696 Link America/Port_of_Spain America/Dominica 1697 Link America/Port_of_Spain America/Grenada 1698 Link America/Port_of_Spain America/Guadeloupe 1699 Link America/Port_of_Spain America/Marigot # St Martin (French part) 1700 Link America/Port_of_Spain America/Montserrat 1701 Link America/Port_of_Spain America/St_Barthelemy # St Barthlemy 1702 Link America/Port_of_Spain America/St_Kitts # St Kitts & Nevis 1703 Link America/Port_of_Spain America/St_Lucia 1704 Link America/Port_of_Spain America/St_Thomas # Virgin Islands (US) 1705 Link America/Port_of_Spain America/St_Vincent 1706 Link America/Port_of_Spain America/Tortola # Virgin Islands (UK) 1707 1708 # Uruguay 1709 # From Paul Eggert (1993-11-18): 1710 # Uruguay wins the prize for the strangest peacetime manipulation of the rules. 1711 # 1712 # From Tim Parenti (2018-02-20), per Jeremie Bonjour (2018-01-31) and Michael 1713 # Deckers (2018-02-20): 1714 # ... At least they kept good records... 1715 # 1716 # http://www.armada.mil.uy/ContenidosPDFs/sohma/web/almanaque/almanaque_2018.pdf#page=36 1717 # Page 36 of Almanaque 2018, published by the Oceanography, Hydrography, and 1718 # Meteorology Service of the Uruguayan Navy, seems to give many transitions 1719 # with greater clarity than we've had before. It directly references many laws 1720 # and decrees which are, in turn, referenced below. They can be viewed in the 1721 # public archives of the Diario Oficial (in Spanish) at 1722 # http://www.impo.com.uy/diariooficial/ 1723 # 1724 # Ley No. 3920 of 1908-06-10 placed the determination of legal time under the 1725 # auspices of the National Institute for the Prediction of Time. It is unclear 1726 # exactly what offset was used during this period, though Ley No. 7200 of 1727 # 1920-04-23 used the Observatory of the National Meteorological Institute in 1728 # Montevideo (34 54' 33" S, 56 12' 45" W) as its reference meridian, 1729 # retarding legal time by 15 minutes 9 seconds from 1920-04-30 24:00, 1730 # resulting in UT-04. Assume the corresponding LMT of UT-03:44:51 (given on 1731 # page 725 of the Proceedings of the Second Pan-American Scientific Congress, 1732 # 1915-1916) was in use, and merely became official from 1908-06-10. 1733 # https://www.impo.com.uy/diariooficial/1908/06/18/12 1734 # https://www.impo.com.uy/diariooficial/1920/04/27/9 1735 # 1736 # Ley No. 7594 of 1923-06-28 specified legal time as Observatory time advanced 1737 # by 44 minutes 51 seconds (UT-03) "from 30 September to 31 March", and by 14 1738 # minutes 51 seconds (UT-03:30) "the rest of the year"; a message from the 1739 # National Council of Administration the same day, published directly below the 1740 # law in the Diario Oficial, specified the first transition to be 1923-09-30 1741 # 24:00. This effectively established standard time at UT-03:30 with 30 1742 # minutes DST. Assume transitions at 24:00 on the specified days until Ley No. 1743 # 7919 of 1926-03-05 ended this arrangement, repealing all "laws and other 1744 # provisions which oppose" it, resulting in year-round UT-03:30; a Resolucin 1745 # of 1926-03-11 puts the final transition at 1926-03-31 24:00, the same as it 1746 # would have been under the previous law. 1747 # https://www.impo.com.uy/diariooficial/1923/07/02/2 1748 # https://www.impo.com.uy/diariooficial/1926/03/10/2 1749 # https://www.impo.com.uy/diariooficial/1926/03/18/2 1750 # 1751 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1752 Rule Uruguay 1923 1925 - Oct 1 0:00 0:30 - 1753 Rule Uruguay 1924 1926 - Apr 1 0:00 0 - 1754 # From Tim Parenti (2018-02-15): 1755 # http://www.impo.com.uy/diariooficial/1933/10/27/6 1756 # 1757 # It appears Ley No. 9122 of 1933 was never published as such in the Diario 1758 # Oficial, but instead appeared as Document 26 in the Diario on Friday 1759 # 1933-10-27 as a decree made Monday 1933-10-23 and filed under the Ministry of 1760 # National Defense. It reinstituted a DST of 30 minutes (to UT-03) "from the 1761 # last Sunday of October...until the last Saturday of March." In accordance 1762 # with this provision, the first transition was explicitly specified in Article 1763 # 2 of the decree as Saturday 1933-10-28 at 24:00; that is, Sunday 1933-10-29 1764 # at 00:00. Assume transitions at 00:00 Sunday throughout. 1765 # 1766 # Departing from the matter-of-fact nature of previous timekeeping laws, the 1767 # 1933 decree "consider[s] the advantages of...the advance of legal time": 1768 # 1769 # "Whereas: The measure adopted by almost all nations at the time of the last 1770 # World War still persists in North America and Europe, precisely because of 1771 # the economic, hygienic, and social advantages derived from such an 1772 # emergency measure... 1773 # 1774 # Whereas: The advance of the legal time during the summer seasons, by 1775 # displacing social activity near sunrise, favors the citizen populations 1776 # and especially the society that creates and works..." 1777 # 1778 # It further specified that "necessary measures" be taken to ensure that 1779 # "public spectacles finish, in general, before [01:00]." 1780 Rule Uruguay 1933 1938 - Oct lastSun 0:00 0:30 - 1781 Rule Uruguay 1934 1941 - Mar lastSat 24:00 0 - 1782 # From Tim Parenti (2018-02-15): 1783 # Most of the Rules below, and their contemporaneous Zone lines, have been 1784 # updated simply to match the Almanaque 2018. Although the document does not 1785 # list exact transition times, midnight transitions were already present in our 1786 # data here for all transitions through 2004-09, and this is both consistent 1787 # with prior transitions and verified in several decrees marked below between 1788 # 1939-09 and 2004-09, wherein the relevant text was typically of the form: 1789 # 1790 # "From 0 hours on [date], the legal time of the entire Republic will be... 1791 # 1792 # In accordance with [the preceding], on [previous date] at 24 hours, all 1793 # clocks throughout the Republic will be [advanced/retarded] by..." 1794 # 1795 # It is possible that there is greater specificity to be found for the Rules 1796 # below, but it is buried in no fewer than 40 different decrees individually 1797 # referenced by the Almanaque for the period from 1939-09 to 2014-09. 1798 # Four-fifths of these were promulgated less than two weeks before taking 1799 # effect; more than half within a week and none more than 5 weeks. Only the 1800 # handful with comments below have been checked with any thoroughness. 1801 Rule Uruguay 1939 only - Oct 1 0:00 0:30 - 1802 Rule Uruguay 1940 only - Oct 27 0:00 0:30 - 1803 # From Tim Parenti (2018-02-15): 1804 # Decreto 1145 of the Ministry of National Defense, dated 1941-07-26, specified 1805 # UT-03 from Friday 1941-08-01 00:00, citing an "urgent...need to save fuel". 1806 # http://www.impo.com.uy/diariooficial/1941/08/04/1 1807 Rule Uruguay 1941 only - Aug 1 0:00 0:30 - 1808 # From Tim Parenti (2018-02-15): 1809 # Decreto 1866 of the Ministry of National Defense, dated 1942-12-09, specified 1810 # further advancement (to UT-02:30) from Sunday 1942-12-13 24:00. Since clocks 1811 # never went back to UT-03:30 thereafter, this is modeled as advancing standard 1812 # time by 30 minutes to UT-03, while retaining 30 minutes of DST. 1813 # http://www.impo.com.uy/diariooficial/1942/12/16/3 1814 Rule Uruguay 1942 only - Dec 14 0:00 0:30 - 1815 Rule Uruguay 1943 only - Mar 14 0:00 0 - 1816 Rule Uruguay 1959 only - May 24 0:00 0:30 - 1817 Rule Uruguay 1959 only - Nov 15 0:00 0 - 1818 Rule Uruguay 1960 only - Jan 17 0:00 1:00 - 1819 Rule Uruguay 1960 only - Mar 6 0:00 0 - 1820 Rule Uruguay 1965 only - Apr 4 0:00 1:00 - 1821 Rule Uruguay 1965 only - Sep 26 0:00 0 - 1822 # From Tim Parenti (2018-02-15): 1823 # Decreto 321/968 of 1968-05-25, citing emergency drought measures decreed the 1824 # day before, brought clocks forward 30 minutes from Monday 1968-05-27 00:00. 1825 # http://www.impo.com.uy/diariooficial/1968/05/30/5 1826 Rule Uruguay 1968 only - May 27 0:00 0:30 - 1827 Rule Uruguay 1968 only - Dec 1 0:00 0 - 1828 # From Tim Parenti (2018-02-15): 1829 # Decreto 188/970 of 1970-04-23 instituted restrictions on electricity 1830 # consumption "as a consequence of the current rainfall regime in the country". 1831 # Articles 13 and 14 advanced clocks by an hour from Saturday 1970-04-25 00:00. 1832 # http://www.impo.com.uy/diariooficial/1970/04/29/4 1833 Rule Uruguay 1970 only - Apr 25 0:00 1:00 - 1834 Rule Uruguay 1970 only - Jun 14 0:00 0 - 1835 Rule Uruguay 1972 only - Apr 23 0:00 1:00 - 1836 Rule Uruguay 1972 only - Jul 16 0:00 0 - 1837 # From Tim Parenti (2018-02-15): 1838 # Decreto 29/974 of 1974-01-11, citing "the international rise in the price of 1839 # oil", advanced clocks by 90 minutes (to UT-01:30). Decreto 163/974 of 1840 # 1974-03-04 returned 60 of those minutes (to UT-02:30), and the remaining 30 1841 # minutes followed in Decreto 679/974 of 1974-08-29. 1842 # http://www.impo.com.uy/diariooficial/1974/01/22/11 1843 # http://www.impo.com.uy/diariooficial/1974/03/14/3 1844 # http://www.impo.com.uy/diariooficial/1974/09/04/6 1845 Rule Uruguay 1974 only - Jan 13 0:00 1:30 - 1846 Rule Uruguay 1974 only - Mar 10 0:00 0:30 - 1847 Rule Uruguay 1974 only - Sep 1 0:00 0 - 1848 Rule Uruguay 1974 only - Dec 22 0:00 1:00 - 1849 Rule Uruguay 1975 only - Mar 30 0:00 0 - 1850 Rule Uruguay 1976 only - Dec 19 0:00 1:00 - 1851 Rule Uruguay 1977 only - Mar 6 0:00 0 - 1852 Rule Uruguay 1977 only - Dec 4 0:00 1:00 - 1853 Rule Uruguay 1978 1979 - Mar Sun>=1 0:00 0 - 1854 Rule Uruguay 1978 only - Dec 17 0:00 1:00 - 1855 Rule Uruguay 1979 only - Apr 29 0:00 1:00 - 1856 Rule Uruguay 1980 only - Mar 16 0:00 0 - 1857 # From Tim Parenti (2018-02-15): 1858 # Decreto 725/987 of 1987-12-04 cited "better use of national tourist 1859 # attractions" to advance clocks one hour from Monday 1987-12-14 00:00. 1860 # http://www.impo.com.uy/diariooficial/1988/01/25/1 1861 Rule Uruguay 1987 only - Dec 14 0:00 1:00 - 1862 Rule Uruguay 1988 only - Feb 28 0:00 0 - 1863 Rule Uruguay 1988 only - Dec 11 0:00 1:00 - 1864 Rule Uruguay 1989 only - Mar 5 0:00 0 - 1865 Rule Uruguay 1989 only - Oct 29 0:00 1:00 - 1866 Rule Uruguay 1990 only - Feb 25 0:00 0 - 1867 # From Tim Parenti (2018-02-15), per Paul Eggert (1999-11-04): 1868 # IATA agrees as below for 1990-10 through 1993-02. Per Almanaque 2018, the 1869 # 1992/1993 season appears to be the first in over half a century where DST 1870 # both began and ended pursuant to the same decree. 1871 Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 - 1872 Rule Uruguay 1991 1992 - Mar Sun>=1 0:00 0 - 1873 Rule Uruguay 1992 only - Oct 18 0:00 1:00 - 1874 Rule Uruguay 1993 only - Feb 28 0:00 0 - 1875 # From Eduardo Cota (2004-09-20): 1876 # The Uruguayan government has decreed a change in the local time.... 1877 # From Tim Parenti (2018-02-15): 1878 # Decreto 328/004 of 2004-09-15. 1879 # http://www.impo.com.uy/diariooficial/2004/09/23/documentos.pdf#page=1 1880 Rule Uruguay 2004 only - Sep 19 0:00 1:00 - 1881 # From Steffen Thorsen (2005-03-11): 1882 # Uruguay's DST was scheduled to end on Sunday, 2005-03-13, but in order to 1883 # save energy ... it was postponed two weeks.... 1884 # From Tim Parenti (2018-02-15): 1885 # This 2005 postponement is not in Almanaque 2018. Go with the contemporaneous 1886 # reporting, which is confirmed by Decreto 107/005 of 2005-03-10 amending 1887 # Decreto 328/004: 1888 # http://www.impo.com.uy/diariooficial/2005/03/15/documentos.pdf#page=1 1889 # The original decree specified a transition of 2005-03-12 24:00, but the new 1890 # one specified 2005-03-27 02:00. 1891 Rule Uruguay 2005 only - Mar 27 2:00 0 - 1892 # From Eduardo Cota (2005-09-27): 1893 # ...from 2005-10-09 at 02:00 local time, until 2006-03-12 at 02:00 local time, 1894 # official time in Uruguay will be at GMT -2. 1895 # From Tim Parenti (2018-02-15): 1896 # Decreto 318/005 of 2005-09-19. 1897 # http://www.impo.com.uy/diariooficial/2005/09/23/documentos.pdf#page=1 1898 Rule Uruguay 2005 only - Oct 9 2:00 1:00 - 1899 Rule Uruguay 2006 2015 - Mar Sun>=8 2:00 0 - 1900 # From Tim Parenti (2018-02-15), per Jesper Nrgaard Welen (2006-09-06): 1901 # Decreto 311/006 of 2006-09-04 established regular DST from the first Sunday 1902 # of October at 02:00 through the second Sunday of March at 02:00. Almanaque 1903 # 2018 appears to have a few typoed dates through this period; ignore them. 1904 # http://www.impo.com.uy/diariooficial/2006/09/08/documentos.pdf#page=1 1905 Rule Uruguay 2006 2014 - Oct Sun>=1 2:00 1:00 - 1906 # From Steffen Thorsen (2015-06-30): 1907 # ... it looks like they will not be using DST the coming summer: 1908 # http://www.elobservador.com.uy/gobierno-resolvio-que-no-habra-cambio-horario-verano-n656787 1909 # http://www.republica.com.uy/este-ano-no-se-modificara-el-huso-horario-en-uruguay/523760/ 1910 # From Paul Eggert (2015-06-30): 1911 # Apparently restaurateurs complained that DST caused people to go to the beach 1912 # instead of out to dinner. 1913 # From Pablo Camargo (2015-07-13): 1914 # http://archivo.presidencia.gub.uy/sci/decretos/2015/06/cons_min_201.pdf 1915 # From Tim Parenti (2018-02-15): 1916 # Decreto 178/015 of 2015-06-29; repeals Decreto 311/006. 1917 1918 # This Zone can be simplified once we assume zic %z. 1919 Zone America/Montevideo -3:44:51 - LMT 1908 Jun 10 1920 -3:44:51 - MMT 1920 May 1 # Montevideo MT 1921 -4:00 - -04 1923 Oct 1 1922 -3:30 Uruguay -0330/-03 1942 Dec 14 1923 -3:00 Uruguay -03/-0230 1960 1924 -3:00 Uruguay -03/-02 1968 1925 -3:00 Uruguay -03/-0230 1970 1926 -3:00 Uruguay -03/-02 1974 1927 -3:00 Uruguay -03/-0130 1974 Mar 10 1928 -3:00 Uruguay -03/-0230 1974 Dec 22 1929 -3:00 Uruguay -03/-02 1930 1931 # Venezuela 1932 # 1933 # From Paul Eggert (2015-07-28): 1934 # For the 1965 transition see Gaceta Oficial No. 27.619 (1964-12-15), p 205.533 1935 # http://www.pgr.gob.ve/dmdocuments/1964/27619.pdf 1936 # 1937 # From John Stainforth (2007-11-28): 1938 # ... the change for Venezuela originally expected for 2007-12-31 has 1939 # been brought forward to 2007-12-09. The official announcement was 1940 # published today in the "Gaceta Oficial de la Repblica Bolivariana 1941 # de Venezuela, nmero 38.819" (official document for all laws or 1942 # resolution publication) 1943 # http://www.globovision.com/news.php?nid=72208 1944 1945 # From Alexander Krivenyshev (2016-04-15): 1946 # https://actualidad.rt.com/actualidad/204758-venezuela-modificar-huso-horario-sequia-elnino 1947 # 1948 # From Paul Eggert (2016-04-15): 1949 # Clocks advance 30 minutes on 2016-05-01 at 02:30.... 1950 # "'Venezuela's new time-zone: hours without light, hours without water, 1951 # hours of presidential broadcasts, hours of lines,' quipped comedian 1952 # Jean Mary Curr ...". See: Cawthorne A, Kai D. Venezuela scraps 1953 # half-hour time difference set by Chavez. Reuters 2016-04-15 14:50 -0400 1954 # https://www.reuters.com/article/us-venezuela-timezone-idUSKCN0XC2BE 1955 # 1956 # From Matt Johnson (2016-04-20): 1957 # ... published in the official Gazette [2016-04-18], here: 1958 # http://historico.tsj.gob.ve/gaceta_ext/abril/1842016/E-1842016-4551.pdf 1959 1960 # Zone NAME GMTOFF RULES FORMAT [UNTIL] 1961 Zone America/Caracas -4:27:44 - LMT 1890 1962 -4:27:40 - CMT 1912 Feb 12 # Caracas Mean Time? 1963 -4:30 - -0430 1965 Jan 1 0:00 1964 -4:00 - -04 2007 Dec 9 3:00 1965 -4:30 - -0430 2016 May 1 2:30 1966 -4:00 - -04 1967
Indexes created Thu Apr 30 00:23:01 UTC 2026