southamerica revision 1.1.1.27
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 - 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 STDOFF 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 #STDOFF -4:16:48.25 404 -4:16:48 - CMT 1920 May # Crdoba Mean Time 405 -4:00 - %z 1930 Dec 406 -4:00 Arg %z 1969 Oct 5 407 -3:00 Arg %z 1999 Oct 3 408 -4:00 Arg %z 2000 Mar 3 409 -3:00 Arg %z 410 # 411 # Crdoba (CB), Santa Fe (SF), Entre Ros (ER), Corrientes (CN), Misiones (MN), 412 # Chaco (CC), Formosa (FM), Santiago del Estero (SE) 413 # 414 # Shanks & Pottenger also make the following claims, which we haven't verified: 415 # - Formosa switched to -3:00 on 1991-01-07. 416 # - Misiones switched to -3:00 on 1990-12-29. 417 # - Chaco switched to -3:00 on 1991-01-04. 418 # - Santiago del Estero switched to -4:00 on 1991-04-01, 419 # then to -3:00 on 1991-04-26. 420 # 421 #STDOFF -4:16:48.25 422 Zone America/Argentina/Cordoba -4:16:48 - LMT 1894 Oct 31 423 -4:16:48 - CMT 1920 May 424 -4:00 - %z 1930 Dec 425 -4:00 Arg %z 1969 Oct 5 426 -3:00 Arg %z 1991 Mar 3 427 -4:00 - %z 1991 Oct 20 428 -3:00 Arg %z 1999 Oct 3 429 -4:00 Arg %z 2000 Mar 3 430 -3:00 Arg %z 431 # 432 # Salta (SA), La Pampa (LP), Neuqun (NQ), Rio Negro (RN) 433 Zone America/Argentina/Salta -4:21:40 - LMT 1894 Oct 31 434 #STDOFF -4:16:48.25 435 -4:16:48 - CMT 1920 May 436 -4:00 - %z 1930 Dec 437 -4:00 Arg %z 1969 Oct 5 438 -3:00 Arg %z 1991 Mar 3 439 -4:00 - %z 1991 Oct 20 440 -3:00 Arg %z 1999 Oct 3 441 -4:00 Arg %z 2000 Mar 3 442 -3:00 Arg %z 2008 Oct 18 443 -3:00 - %z 444 # 445 # Tucumn (TM) 446 Zone America/Argentina/Tucuman -4:20:52 - LMT 1894 Oct 31 447 #STDOFF -4:16:48.25 448 -4:16:48 - CMT 1920 May 449 -4:00 - %z 1930 Dec 450 -4:00 Arg %z 1969 Oct 5 451 -3:00 Arg %z 1991 Mar 3 452 -4:00 - %z 1991 Oct 20 453 -3:00 Arg %z 1999 Oct 3 454 -4:00 Arg %z 2000 Mar 3 455 -3:00 - %z 2004 Jun 1 456 -4:00 - %z 2004 Jun 13 457 -3:00 Arg %z 458 # 459 # La Rioja (LR) 460 Zone America/Argentina/La_Rioja -4:27:24 - LMT 1894 Oct 31 461 #STDOFF -4:16:48.25 462 -4:16:48 - CMT 1920 May 463 -4:00 - %z 1930 Dec 464 -4:00 Arg %z 1969 Oct 5 465 -3:00 Arg %z 1991 Mar 1 466 -4:00 - %z 1991 May 7 467 -3:00 Arg %z 1999 Oct 3 468 -4:00 Arg %z 2000 Mar 3 469 -3:00 - %z 2004 Jun 1 470 -4:00 - %z 2004 Jun 20 471 -3:00 Arg %z 2008 Oct 18 472 -3:00 - %z 473 # 474 # San Juan (SJ) 475 Zone America/Argentina/San_Juan -4:34:04 - LMT 1894 Oct 31 476 #STDOFF -4:16:48.25 477 -4:16:48 - CMT 1920 May 478 -4:00 - %z 1930 Dec 479 -4:00 Arg %z 1969 Oct 5 480 -3:00 Arg %z 1991 Mar 1 481 -4:00 - %z 1991 May 7 482 -3:00 Arg %z 1999 Oct 3 483 -4:00 Arg %z 2000 Mar 3 484 -3:00 - %z 2004 May 31 485 -4:00 - %z 2004 Jul 25 486 -3:00 Arg %z 2008 Oct 18 487 -3:00 - %z 488 # 489 # Jujuy (JY) 490 Zone America/Argentina/Jujuy -4:21:12 - LMT 1894 Oct 31 491 #STDOFF -4:16:48.25 492 -4:16:48 - CMT 1920 May 493 -4:00 - %z 1930 Dec 494 -4:00 Arg %z 1969 Oct 5 495 -3:00 Arg %z 1990 Mar 4 496 -4:00 - %z 1990 Oct 28 497 -4:00 1:00 %z 1991 Mar 17 498 -4:00 - %z 1991 Oct 6 499 -3:00 1:00 %z 1992 500 -3:00 Arg %z 1999 Oct 3 501 -4:00 Arg %z 2000 Mar 3 502 -3:00 Arg %z 2008 Oct 18 503 -3:00 - %z 504 # 505 # Catamarca (CT), Chubut (CH) 506 Zone America/Argentina/Catamarca -4:23:08 - LMT 1894 Oct 31 507 #STDOFF -4:16:48.25 508 -4:16:48 - CMT 1920 May 509 -4:00 - %z 1930 Dec 510 -4:00 Arg %z 1969 Oct 5 511 -3:00 Arg %z 1991 Mar 3 512 -4:00 - %z 1991 Oct 20 513 -3:00 Arg %z 1999 Oct 3 514 -4:00 Arg %z 2000 Mar 3 515 -3:00 - %z 2004 Jun 1 516 -4:00 - %z 2004 Jun 20 517 -3:00 Arg %z 2008 Oct 18 518 -3:00 - %z 519 # 520 # Mendoza (MZ) 521 Zone America/Argentina/Mendoza -4:35:16 - LMT 1894 Oct 31 522 #STDOFF -4:16:48.25 523 -4:16:48 - CMT 1920 May 524 -4:00 - %z 1930 Dec 525 -4:00 Arg %z 1969 Oct 5 526 -3:00 Arg %z 1990 Mar 4 527 -4:00 - %z 1990 Oct 15 528 -4:00 1:00 %z 1991 Mar 1 529 -4:00 - %z 1991 Oct 15 530 -4:00 1:00 %z 1992 Mar 1 531 -4:00 - %z 1992 Oct 18 532 -3:00 Arg %z 1999 Oct 3 533 -4:00 Arg %z 2000 Mar 3 534 -3:00 - %z 2004 May 23 535 -4:00 - %z 2004 Sep 26 536 -3:00 Arg %z 2008 Oct 18 537 -3:00 - %z 538 # 539 # San Luis (SL) 540 541 Rule SanLuis 2008 2009 - Mar Sun>=8 0:00 0 - 542 Rule SanLuis 2007 2008 - Oct Sun>=8 0:00 1:00 - 543 544 Zone America/Argentina/San_Luis -4:25:24 - LMT 1894 Oct 31 545 #STDOFF -4:16:48.25 546 -4:16:48 - CMT 1920 May 547 -4:00 - %z 1930 Dec 548 -4:00 Arg %z 1969 Oct 5 549 -3:00 Arg %z 1990 550 -3:00 1:00 %z 1990 Mar 14 551 -4:00 - %z 1990 Oct 15 552 -4:00 1:00 %z 1991 Mar 1 553 -4:00 - %z 1991 Jun 1 554 -3:00 - %z 1999 Oct 3 555 -4:00 1:00 %z 2000 Mar 3 556 -3:00 - %z 2004 May 31 557 -4:00 - %z 2004 Jul 25 558 -3:00 Arg %z 2008 Jan 21 559 -4:00 SanLuis %z 2009 Oct 11 560 -3:00 - %z 561 # 562 # Santa Cruz (SC) 563 Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31 564 #STDOFF -4:16:48.25 565 -4:16:48 - CMT 1920 May 566 -4:00 - %z 1930 Dec 567 -4:00 Arg %z 1969 Oct 5 568 -3:00 Arg %z 1999 Oct 3 569 -4:00 Arg %z 2000 Mar 3 570 -3:00 - %z 2004 Jun 1 571 -4:00 - %z 2004 Jun 20 572 -3:00 Arg %z 2008 Oct 18 573 -3:00 - %z 574 # 575 # Tierra del Fuego, Antrtida e Islas del Atlntico Sur (TF) 576 Zone America/Argentina/Ushuaia -4:33:12 - LMT 1894 Oct 31 577 #STDOFF -4:16:48.25 578 -4:16:48 - CMT 1920 May 579 -4:00 - %z 1930 Dec 580 -4:00 Arg %z 1969 Oct 5 581 -3:00 Arg %z 1999 Oct 3 582 -4:00 Arg %z 2000 Mar 3 583 -3:00 - %z 2004 May 30 584 -4:00 - %z 2004 Jun 20 585 -3:00 Arg %z 2008 Oct 18 586 -3:00 - %z 587 588 # Bolivia 589 # Zone NAME STDOFF RULES FORMAT [UNTIL] 590 Zone America/La_Paz -4:32:36 - LMT 1890 591 -4:32:36 - CMT 1931 Oct 15 # Calamarca MT 592 -4:32:36 1:00 BST 1932 Mar 21 # Bolivia ST 593 -4:00 - %z 594 595 # Brazil 596 597 # From Paul Eggert (1993-11-18): 598 # The mayor of Rio recently attempted to change the time zone rules 599 # just in his city, in order to leave more summer time for the tourist trade. 600 # The rule change lasted only part of the day; 601 # the federal government refused to follow the city's rules, and business 602 # was in a chaos, so the mayor backed down that afternoon. 603 604 # From IATA SSIM (1996-02): 605 # _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS), 606 # Santa Catarina (SC), Paran (PR), So Paulo (SP), Rio de Janeiro (RJ), 607 # Esprito Santo (ES), Minas Gerais (MG), Bahia (BA), Gois (GO), 608 # Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL]. 609 # [The last three states are new to this issue of the IATA SSIM.] 610 611 # From Gwillim Law (1996-10-07): 612 # Geography, history (Tocantins was part of Gois until 1989), and other 613 # sources of time zone information lead me to believe that AL, SE, and TO were 614 # always in BR1, and so the only change was whether or not they observed DST.... 615 # The earliest issue of the SSIM I have is 2/91. Each issue from then until 616 # 9/95 says that DST is observed only in the ten states I quoted from 9/95, 617 # along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2 618 # (UTC-4).... The other two time zones given for Brazil are BR3, which is 619 # UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is 620 # UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's 621 # become part of the state of Pernambuco). The boundary between BR1 and BR2 622 # has never been clearly stated. They've simply been called East and West. 623 # However, some conclusions can be drawn from another IATA manual: the Airline 624 # Coding Directory, which lists close to 400 airports in Brazil. For each 625 # airport it gives a time zone which is coded to the SSIM. From that 626 # information, I'm led to conclude that the states of Amap (AP), Cear (CE), 627 # Maranho (MA), Paraba (PR), Pernambuco (PE), Piau (PI), and Rio Grande do 628 # Norte (RN), and the eastern part of Par (PA) are all in BR1 without DST. 629 630 # From Marcos Tadeu (1998-09-27): 631 # Brazilian official page <http://pcdsh01.on.br/verao1.html> 632 633 # From Jesper Nrgaard (2000-11-03): 634 # [For an official list of which regions in Brazil use which time zones, see:] 635 # http://pcdsh01.on.br/Fusbr.htm 636 # http://pcdsh01.on.br/Fusbrhv.htm 637 638 # From Celso Doria via David Madeo (2002-10-09): 639 # The reason for the delay this year has to do with elections in Brazil. 640 # 641 # Unlike in the United States, elections in Brazil are 100% computerized and 642 # the results are known almost immediately. Yesterday, it was the first 643 # round of the elections when 115 million Brazilians voted for President, 644 # Governor, Senators, Federal Deputies, and State Deputies. Nobody is 645 # counting (or re-counting) votes anymore and we know there will be a second 646 # round for the Presidency and also for some Governors. The 2nd round will 647 # take place on October 27th. 648 # 649 # The reason why the DST will only begin November 3rd is that the thousands 650 # of electoral machines used cannot have their time changed, and since the 651 # Constitution says the elections must begin at 8:00 AM and end at 5:00 PM, 652 # the Government decided to postpone DST, instead of changing the Constitution 653 # (maybe, for the next elections, it will be possible to change the clock)... 654 655 # From Rodrigo Severo (2004-10-04): 656 # It's just the biannual change made necessary by the much hyped, supposedly 657 # modern Brazilian ... voting machines which, apparently, can't deal 658 # with a time change between the first and the second rounds of the elections. 659 660 # From Steffen Thorsen (2007-09-20): 661 # Brazil will start DST on 2007-10-14 00:00 and end on 2008-02-17 00:00: 662 # http://www.mme.gov.br/site/news/detail.do;jsessionid=BBA06811AFCAAC28F0285210913513DA?newsId=13975 663 664 # From Paul Schulze (2008-06-24): 665 # ...by law number 11.662 of April 24, 2008 (published in the "Diario 666 # Oficial da Unio"...) in Brazil there are changes in the timezones, 667 # effective today (00:00am at June 24, 2008) as follows: 668 # 669 # a) The timezone UTC+5 is extinguished, with all the Acre state and the 670 # part of the Amazonas state that had this timezone now being put to the 671 # timezone UTC+4 672 # b) The whole Par state now is put at timezone UTC+3, instead of just 673 # part of it, as was before. 674 # 675 # This change follows a proposal of senator Tiao Viana of Acre state, that 676 # proposed it due to concerns about open television channels displaying 677 # programs inappropriate to youths in the states that had the timezone 678 # UTC+5 too early in the night. In the occasion, some more corrections 679 # were proposed, trying to unify the timezones of any given state. This 680 # change modifies timezone rules defined in decree 2.784 of 18 June, 681 # 1913. 682 683 # From Rodrigo Severo (2008-06-24): 684 # Just correcting the URL: 685 # https://www.in.gov.br/imprensa/visualiza/index.jsp?jornal=do&secao=1&pagina=1&data=25/04/2008 686 # 687 # As a result of the above Decree I believe the America/Rio_Branco 688 # timezone shall be modified from UTC-5 to UTC-4 and a new timezone shall 689 # be created to represent the...west side of the Par State. I 690 # suggest this new timezone be called Santarem as the most 691 # important/populated city in the affected area. 692 # 693 # This new timezone would be the same as the Rio_Branco timezone up to 694 # the 2008/06/24 change which would be to UTC-3 instead of UTC-4. 695 696 # From Alex Krivenyshev (2008-06-24): 697 # This is a quick reference page for New and Old Brazil Time Zones map. 698 # http://www.worldtimezone.com/brazil-time-new-old.php 699 # 700 # - 4 time zones replaced by 3 time zones - eliminating time zone UTC-05 701 # (state Acre and the part of the Amazonas will be UTC/GMT-04) - western 702 # part of Par state is moving to one timezone UTC-03 (from UTC-04). 703 704 # From Paul Eggert (2002-10-10): 705 # The official decrees referenced below are mostly taken from 706 # Decretos sobre o Horrio de Vero no Brasil. 707 # http://pcdsh01.on.br/DecHV.html 708 709 # From Steffen Thorsen (2008-08-29): 710 # As announced by the government and many newspapers in Brazil late 711 # yesterday, Brazil will start DST on 2008-10-19 (need to change rule) and 712 # it will end on 2009-02-15 (current rule for Brazil is fine). Based on 713 # past years experience with the elections, there was a good chance that 714 # the start was postponed to November, but it did not happen this year. 715 # 716 # It has not yet been posted to http://pcdsh01.on.br/DecHV.html 717 # 718 # An official page about it: 719 # http://www.mme.gov.br/site/news/detail.do?newsId=16722 720 # Note that this link does not always work directly, but must be accessed 721 # by going to 722 # http://www.mme.gov.br/first 723 # 724 # One example link that works directly: 725 # http://jornale.com.br/index.php?option=com_content&task=view&id=13530&Itemid=54 726 # (Portuguese) 727 # 728 # We have a written a short article about it as well: 729 # https://www.timeanddate.com/news/time/brazil-dst-2008-2009.html 730 # 731 # From Alexander Krivenyshev (2011-10-04): 732 # State Bahia will return to Daylight savings time this year after 8 years off. 733 # The announcement was made by Governor Jaques Wagner in an interview to a 734 # television station in Salvador. 735 736 # In Portuguese: 737 # http://g1.globo.com/bahia/noticia/2011/10/governador-jaques-wagner-confirma-horario-de-verao-na-bahia.html 738 # https://noticias.terra.com.br/brasil/noticias/0,,OI5390887-EI8139,00-Bahia+volta+a+ter+horario+de+verao+apos+oito+anos.html 739 740 # From Guilherme Bernardes Rodrigues (2011-10-07): 741 # There is news in the media, however there is still no decree about it. 742 # I just send a e-mail to Zulmira Brandao at http://pcdsh01.on.br/ the 743 # official agency about time in Brazil, and she confirmed that the old rule is 744 # still in force. 745 746 # From Guilherme Bernardes Rodrigues (2011-10-14) 747 # It's official, the President signed a decree that includes Bahia in summer 748 # time. 749 # [ and in a second message (same day): ] 750 # I found the decree. 751 # 752 # DECRETO No. 7.584, DE 13 DE OUTUBRO DE 2011 753 # Link : 754 # http://www.in.gov.br/visualiza/index.jsp?data=13/10/2011&jornal=1000&pagina=6&totalArquivos=6 755 756 # From Kelley Cook (2012-10-16): 757 # The governor of state of Bahia in Brazil announced on Thursday that 758 # due to public pressure, he is reversing the DST policy they implemented 759 # last year and will not be going to Summer Time on October 21st.... 760 # http://www.correio24horas.com.br/r/artigo/apos-pressoes-wagner-suspende-horario-de-verao-na-bahia 761 762 # From Rodrigo Severo (2012-10-16): 763 # Tocantins state will have DST. 764 # https://noticias.terra.com.br/brasil/noticias/0,,OI6232536-EI306.html 765 766 # From Steffen Thorsen (2013-09-20): 767 # Tocantins in Brazil is very likely not to observe DST from October.... 768 # http://conexaoto.com.br/2013/09/18/ministerio-confirma-que-tocantins-esta-fora-do-horario-de-verao-em-2013-mas-falta-publicacao-de-decreto 769 # We will keep this article updated when this is confirmed: 770 # https://www.timeanddate.com/news/time/brazil-starts-dst-2013.html 771 772 # From Steffen Thorsen (2013-10-17): 773 # https://www.timeanddate.com/news/time/acre-amazonas-change-time-zone.html 774 # Senator Jorge Viana announced that Acre will change time zone on November 10. 775 # He did not specify the time of the change, nor if western parts of Amazonas 776 # will change as well. 777 # 778 # From Paul Eggert (2013-10-17): 779 # For now, assume western Amazonas will change as well. 780 781 # Rule NAME FROM TO - IN ON AT SAVE LETTER/S 782 # Decree 20,466 <http://pcdsh01.on.br/HV20466.htm> (1931-10-01) 783 # Decree 21,896 <http://pcdsh01.on.br/HV21896.htm> (1932-01-10) 784 Rule Brazil 1931 only - Oct 3 11:00 1:00 - 785 Rule Brazil 1932 1933 - Apr 1 0:00 0 - 786 Rule Brazil 1932 only - Oct 3 0:00 1:00 - 787 # Decree 23,195 <http://pcdsh01.on.br/HV23195.htm> (1933-10-10) 788 # revoked DST. 789 # Decree 27,496 <http://pcdsh01.on.br/HV27496.htm> (1949-11-24) 790 # Decree 27,998 <http://pcdsh01.on.br/HV27998.htm> (1950-04-13) 791 Rule Brazil 1949 1952 - Dec 1 0:00 1:00 - 792 Rule Brazil 1950 only - Apr 16 1:00 0 - 793 Rule Brazil 1951 1952 - Apr 1 0:00 0 - 794 # Decree 32,308 <http://pcdsh01.on.br/HV32308.htm> (1953-02-24) 795 Rule Brazil 1953 only - Mar 1 0:00 0 - 796 # Decree 34,724 <http://pcdsh01.on.br/HV34724.htm> (1953-11-30) 797 # revoked DST. 798 # Decree 52,700 <http://pcdsh01.on.br/HV52700.htm> (1963-10-18) 799 # established DST from 1963-10-23 00:00 to 1964-02-29 00:00 800 # in SP, RJ, GB, MG, ES, due to the prolongation of the drought. 801 # Decree 53,071 <http://pcdsh01.on.br/HV53071.htm> (1963-12-03) 802 # extended the above decree to all of the national territory on 12-09. 803 Rule Brazil 1963 only - Dec 9 0:00 1:00 - 804 # Decree 53,604 <http://pcdsh01.on.br/HV53604.htm> (1964-02-25) 805 # extended summer time by one day to 1964-03-01 00:00 (start of school). 806 Rule Brazil 1964 only - Mar 1 0:00 0 - 807 # Decree 55,639 <http://pcdsh01.on.br/HV55639.htm> (1965-01-27) 808 Rule Brazil 1965 only - Jan 31 0:00 1:00 - 809 Rule Brazil 1965 only - Mar 31 0:00 0 - 810 # Decree 57,303 <http://pcdsh01.on.br/HV57303.htm> (1965-11-22) 811 Rule Brazil 1965 only - Dec 1 0:00 1:00 - 812 # Decree 57,843 <http://pcdsh01.on.br/HV57843.htm> (1966-02-18) 813 Rule Brazil 1966 1968 - Mar 1 0:00 0 - 814 Rule Brazil 1966 1967 - Nov 1 0:00 1:00 - 815 # Decree 63,429 <http://pcdsh01.on.br/HV63429.htm> (1968-10-15) 816 # revoked DST. 817 # Decree 91,698 <http://pcdsh01.on.br/HV91698.htm> (1985-09-27) 818 Rule Brazil 1985 only - Nov 2 0:00 1:00 - 819 # Decree 92,310 (1986-01-21) 820 # Decree 92,463 (1986-03-13) 821 Rule Brazil 1986 only - Mar 15 0:00 0 - 822 # Decree 93,316 (1986-10-01) 823 Rule Brazil 1986 only - Oct 25 0:00 1:00 - 824 Rule Brazil 1987 only - Feb 14 0:00 0 - 825 # Decree 94,922 <http://pcdsh01.on.br/HV94922.htm> (1987-09-22) 826 Rule Brazil 1987 only - Oct 25 0:00 1:00 - 827 Rule Brazil 1988 only - Feb 7 0:00 0 - 828 # Decree 96,676 <http://pcdsh01.on.br/HV96676.htm> (1988-09-12) 829 # except for the states of AC, AM, PA, RR, RO, and AP (then a territory) 830 Rule Brazil 1988 only - Oct 16 0:00 1:00 - 831 Rule Brazil 1989 only - Jan 29 0:00 0 - 832 # Decree 98,077 <http://pcdsh01.on.br/HV98077.htm> (1989-08-21) 833 # with the same exceptions 834 Rule Brazil 1989 only - Oct 15 0:00 1:00 - 835 Rule Brazil 1990 only - Feb 11 0:00 0 - 836 # Decree 99,530 <http://pcdsh01.on.br/HV99530.htm> (1990-09-17) 837 # adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF. 838 # Decree 99,629 (1990-10-19) adds BA, MT. 839 Rule Brazil 1990 only - Oct 21 0:00 1:00 - 840 Rule Brazil 1991 only - Feb 17 0:00 0 - 841 # Unnumbered decree <http://pcdsh01.on.br/HV1991.htm> (1991-09-25) 842 # adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF. 843 Rule Brazil 1991 only - Oct 20 0:00 1:00 - 844 Rule Brazil 1992 only - Feb 9 0:00 0 - 845 # Unnumbered decree <http://pcdsh01.on.br/HV1992.htm> (1992-10-16) 846 # adopted by same states. 847 Rule Brazil 1992 only - Oct 25 0:00 1:00 - 848 Rule Brazil 1993 only - Jan 31 0:00 0 - 849 # Decree 942 <http://pcdsh01.on.br/HV942.htm> (1993-09-28) 850 # adopted by same states, plus AM. 851 # Decree 1,252 <http://pcdsh01.on.br/HV1252.htm> (1994-09-22; 852 # web page corrected 2004-01-07) adopted by same states, minus AM. 853 # Decree 1,636 <http://pcdsh01.on.br/HV1636.htm> (1995-09-14) 854 # adopted by same states, plus MT and TO. 855 # Decree 1,674 <http://pcdsh01.on.br/HV1674.htm> (1995-10-13) 856 # adds AL, SE. 857 Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 - 858 Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 - 859 Rule Brazil 1996 only - Feb 11 0:00 0 - 860 # Decree 2,000 <http://pcdsh01.on.br/HV2000.htm> (1996-09-04) 861 # adopted by same states, minus AL, SE. 862 Rule Brazil 1996 only - Oct 6 0:00 1:00 - 863 Rule Brazil 1997 only - Feb 16 0:00 0 - 864 # From Daniel C. Sobral (1998-02-12): 865 # In 1997, the DS began on October 6. The stated reason was that 866 # because international television networks ignored Brazil's policy on DS, 867 # they bought the wrong times on satellite for coverage of Pope's visit. 868 # This year, the ending date of DS was postponed to March 1 869 # to help dealing with the shortages of electric power. 870 # 871 # Decree 2,317 (1997-09-04), adopted by same states. 872 Rule Brazil 1997 only - Oct 6 0:00 1:00 - 873 # Decree 2,495 <http://pcdsh01.on.br/figuras/HV2495.JPG> 874 # (1998-02-10) 875 Rule Brazil 1998 only - Mar 1 0:00 0 - 876 # Decree 2,780 <http://pcdsh01.on.br/figuras/Hv98.jpg> (1998-09-11) 877 # adopted by the same states as before. 878 Rule Brazil 1998 only - Oct 11 0:00 1:00 - 879 Rule Brazil 1999 only - Feb 21 0:00 0 - 880 # Decree 3,150 <http://pcdsh01.on.br/figuras/HV3150.gif> 881 # (1999-08-23) adopted by same states. 882 # Decree 3,188 <http://pcdsh01.on.br/DecHV99.gif> (1999-09-30) 883 # adds SE, AL, PB, PE, RN, CE, PI, MA and RR. 884 Rule Brazil 1999 only - Oct 3 0:00 1:00 - 885 Rule Brazil 2000 only - Feb 27 0:00 0 - 886 # Decree 3,592 <http://pcdsh01.on.br/DEC3592.htm> (2000-09-06) 887 # adopted by the same states as before. 888 # Decree 3,630 <http://pcdsh01.on.br/Dec3630.jpg> (2000-10-13) 889 # repeals DST in PE and RR, effective 2000-10-15 00:00. 890 # Decree 3,632 <http://pcdsh01.on.br/Dec3632.jpg> (2000-10-17) 891 # repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00. 892 # Decree 3,916 <http://pcdsh01.on.br/figuras/HV3916.gif> 893 # (2001-09-13) reestablishes DST in AL, CE, MA, PB, PE, PI, RN, SE. 894 Rule Brazil 2000 2001 - Oct Sun>=8 0:00 1:00 - 895 Rule Brazil 2001 2006 - Feb Sun>=15 0:00 0 - 896 # Decree 4,399 (2002-10-01) repeals DST in AL, CE, MA, PB, PE, PI, RN, SE. 897 # 4,399 <http://www.presidencia.gov.br/CCIVIL/decreto/2002/D4399.htm> 898 Rule Brazil 2002 only - Nov 3 0:00 1:00 - 899 # Decree 4,844 (2003-09-24; corrected 2003-09-26) repeals DST in BA, MT, TO. 900 # 4,844 <http://www.presidencia.gov.br/CCIVIL/decreto/2003/D4844.htm> 901 Rule Brazil 2003 only - Oct 19 0:00 1:00 - 902 # Decree 5,223 (2004-10-01) reestablishes DST in MT. 903 # 5,223 <http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2004/Decreto/D5223.htm> 904 Rule Brazil 2004 only - Nov 2 0:00 1:00 - 905 # Decree 5,539 <http://pcdsh01.on.br/DecHV5539.gif> (2005-09-19), 906 # adopted by the same states as before. 907 Rule Brazil 2005 only - Oct 16 0:00 1:00 - 908 # Decree 5,920 <http://pcdsh01.on.br/DecHV5920.gif> (2006-10-03), 909 # adopted by the same states as before. 910 Rule Brazil 2006 only - Nov 5 0:00 1:00 - 911 Rule Brazil 2007 only - Feb 25 0:00 0 - 912 # Decree 6,212 <http://pcdsh01.on.br/DecHV6212.gif> (2007-09-26), 913 # adopted by the same states as before. 914 Rule Brazil 2007 only - Oct Sun>=8 0:00 1:00 - 915 # From Frederico A. C. Neves (2008-09-10): 916 # According to this decree 917 # http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm 918 # [t]he DST period in Brazil now on will be from the 3rd Oct Sunday to the 919 # 3rd Feb Sunday. There is an exception on the return date when this is 920 # the Carnival Sunday then the return date will be the next Sunday... 921 Rule Brazil 2008 2017 - Oct Sun>=15 0:00 1:00 - 922 Rule Brazil 2008 2011 - Feb Sun>=15 0:00 0 - 923 # Decree 7,584 <http://pcdsh01.on.br/HVdecreto7584_20111013.jpg> (2011-10-13) 924 # added Bahia. 925 Rule Brazil 2012 only - Feb Sun>=22 0:00 0 - 926 # Decree 7,826 <http://pcdsh01.on.br/HVdecreto7826_20121015.jpg> (2012-10-15) 927 # removed Bahia and added Tocantins. 928 # Decree 8,112 <http://pcdsh01.on.br/HVdecreto8112_20130930.JPG> (2013-09-30) 929 # removed Tocantins. 930 Rule Brazil 2013 2014 - Feb Sun>=15 0:00 0 - 931 Rule Brazil 2015 only - Feb Sun>=22 0:00 0 - 932 Rule Brazil 2016 2019 - Feb Sun>=15 0:00 0 - 933 # From Steffen Thorsen (2017-12-18): 934 # According to many media sources, next year's DST start in Brazil will move to 935 # the first Sunday of November 936 # ... https://www.timeanddate.com/news/time/brazil-delays-dst-2018.html 937 # From Steffen Thorsen (2017-12-20): 938 # http://www.planalto.gov.br/ccivil_03/_ato2015-2018/2017/decreto/D9242.htm 939 # From Fbio Gomes (2018-10-04): 940 # The Brazilian president just announced a new change on this year DST. 941 # It was scheduled to start on November 4th and it was changed to November 18th. 942 # From Rodrigo Brning Wessler (2018-10-15): 943 # The Brazilian government just announced that the change in DST was 944 # canceled.... Maybe the president Michel Temer also woke up one hour 945 # earlier today. :) 946 Rule Brazil 2018 only - Nov Sun>=1 0:00 1:00 - 947 # The last ruleset listed above says that the following states observed DST: 948 # DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP. 949 # 950 # From Steffen Thorsen (2019-04-05): 951 # According to multiple sources the Brazilian president wants to get rid of DST. 952 # https://gmconline.com.br/noticias/politica/bolsonaro-horario-de-verao-deve-acabar-este-ano 953 # https://g1.globo.com/economia/noticia/2019/04/05/governo-anuncia-fim-do-horario-de-verao.ghtml 954 # From Marcus Diniz (2019-04-25): 955 # Brazil no longer has DST changes - decree signed today 956 # https://g1.globo.com/politica/noticia/2019/04/25/bolsonaro-assina-decreto-que-acaba-com-o-horario-de-verao.ghtml 957 # From Daniel Soares de Oliveira (2019-04-26): 958 # http://www.planalto.gov.br/ccivil_03/_Ato2019-2022/2019/Decreto/D9772.htm 959 960 # Zone NAME STDOFF RULES FORMAT [UNTIL] 961 # 962 # Fernando de Noronha (administratively part of PE) 963 Zone America/Noronha -2:09:40 - LMT 1914 964 -2:00 Brazil %z 1990 Sep 17 965 -2:00 - %z 1999 Sep 30 966 -2:00 Brazil %z 2000 Oct 15 967 -2:00 - %z 2001 Sep 13 968 -2:00 Brazil %z 2002 Oct 1 969 -2:00 - %z 970 # Other Atlantic islands have no permanent settlement. 971 # These include Trindade and Martim Vaz (administratively part of ES), 972 # Rocas Atoll (RN), and the St Peter and St Paul Archipelago (PE). 973 # Fernando de Noronha was a separate territory from 1942-09-02 to 1989-01-01; 974 # it also included the Penedos. 975 # 976 # Amap (AP), east Par (PA) 977 # East Par includes Belm, Marab, Serra Norte, and So Flix do Xingu. 978 # The division between east and west Par is the river Xingu. 979 # In the north a very small part from the river Javary (now Jari I guess, 980 # the border with Amap) to the Amazon, then to the Xingu. 981 Zone America/Belem -3:13:56 - LMT 1914 982 -3:00 Brazil %z 1988 Sep 12 983 -3:00 - %z 984 # 985 # west Par (PA) 986 # West Par includes Altamira, bidos, Prainha, Oriximin, and Santarm. 987 Zone America/Santarem -3:38:48 - LMT 1914 988 -4:00 Brazil %z 1988 Sep 12 989 -4:00 - %z 2008 Jun 24 0:00 990 -3:00 - %z 991 # 992 # Maranho (MA), Piau (PI), Cear (CE), Rio Grande do Norte (RN), 993 # Paraba (PB) 994 Zone America/Fortaleza -2:34:00 - LMT 1914 995 -3:00 Brazil %z 1990 Sep 17 996 -3:00 - %z 1999 Sep 30 997 -3:00 Brazil %z 2000 Oct 22 998 -3:00 - %z 2001 Sep 13 999 -3:00 Brazil %z 2002 Oct 1 1000 -3:00 - %z 1001 # 1002 # Pernambuco (PE) (except Atlantic islands) 1003 Zone America/Recife -2:19:36 - LMT 1914 1004 -3:00 Brazil %z 1990 Sep 17 1005 -3:00 - %z 1999 Sep 30 1006 -3:00 Brazil %z 2000 Oct 15 1007 -3:00 - %z 2001 Sep 13 1008 -3:00 Brazil %z 2002 Oct 1 1009 -3:00 - %z 1010 # 1011 # Tocantins (TO) 1012 Zone America/Araguaina -3:12:48 - LMT 1914 1013 -3:00 Brazil %z 1990 Sep 17 1014 -3:00 - %z 1995 Sep 14 1015 -3:00 Brazil %z 2003 Sep 24 1016 -3:00 - %z 2012 Oct 21 1017 -3:00 Brazil %z 2013 Sep 1018 -3:00 - %z 1019 # 1020 # Alagoas (AL), Sergipe (SE) 1021 Zone America/Maceio -2:22:52 - LMT 1914 1022 -3:00 Brazil %z 1990 Sep 17 1023 -3:00 - %z 1995 Oct 13 1024 -3:00 Brazil %z 1996 Sep 4 1025 -3:00 - %z 1999 Sep 30 1026 -3:00 Brazil %z 2000 Oct 22 1027 -3:00 - %z 2001 Sep 13 1028 -3:00 Brazil %z 2002 Oct 1 1029 -3:00 - %z 1030 # 1031 # Bahia (BA) 1032 # There are too many Salvadors elsewhere, so use America/Bahia instead 1033 # of America/Salvador. 1034 Zone America/Bahia -2:34:04 - LMT 1914 1035 -3:00 Brazil %z 2003 Sep 24 1036 -3:00 - %z 2011 Oct 16 1037 -3:00 Brazil %z 2012 Oct 21 1038 -3:00 - %z 1039 # 1040 # Gois (GO), Distrito Federal (DF), Minas Gerais (MG), 1041 # Esprito Santo (ES), Rio de Janeiro (RJ), So Paulo (SP), Paran (PR), 1042 # Santa Catarina (SC), Rio Grande do Sul (RS) 1043 Zone America/Sao_Paulo -3:06:28 - LMT 1914 1044 -3:00 Brazil %z 1963 Oct 23 0:00 1045 -3:00 1:00 %z 1964 1046 -3:00 Brazil %z 1047 # 1048 # Mato Grosso do Sul (MS) 1049 Zone America/Campo_Grande -3:38:28 - LMT 1914 1050 -4:00 Brazil %z 1051 # 1052 # Mato Grosso (MT) 1053 Zone America/Cuiaba -3:44:20 - LMT 1914 1054 -4:00 Brazil %z 2003 Sep 24 1055 -4:00 - %z 2004 Oct 1 1056 -4:00 Brazil %z 1057 # 1058 # Rondnia (RO) 1059 Zone America/Porto_Velho -4:15:36 - LMT 1914 1060 -4:00 Brazil %z 1988 Sep 12 1061 -4:00 - %z 1062 # 1063 # Roraima (RR) 1064 Zone America/Boa_Vista -4:02:40 - LMT 1914 1065 -4:00 Brazil %z 1988 Sep 12 1066 -4:00 - %z 1999 Sep 30 1067 -4:00 Brazil %z 2000 Oct 15 1068 -4:00 - %z 1069 # 1070 # east Amazonas (AM): Boca do Acre, Juta, Manaus, Floriano Peixoto 1071 # The great circle line from Tabatinga to Porto Acre divides 1072 # east from west Amazonas. 1073 Zone America/Manaus -4:00:04 - LMT 1914 1074 -4:00 Brazil %z 1988 Sep 12 1075 -4:00 - %z 1993 Sep 28 1076 -4:00 Brazil %z 1994 Sep 22 1077 -4:00 - %z 1078 # 1079 # west Amazonas (AM): Atalaia do Norte, Boca do Maoco, Benjamin Constant, 1080 # Eirunep, Envira, Ipixuna 1081 Zone America/Eirunepe -4:39:28 - LMT 1914 1082 -5:00 Brazil %z 1988 Sep 12 1083 -5:00 - %z 1993 Sep 28 1084 -5:00 Brazil %z 1994 Sep 22 1085 -5:00 - %z 2008 Jun 24 0:00 1086 -4:00 - %z 2013 Nov 10 1087 -5:00 - %z 1088 # 1089 # Acre (AC) 1090 Zone America/Rio_Branco -4:31:12 - LMT 1914 1091 -5:00 Brazil %z 1988 Sep 12 1092 -5:00 - %z 2008 Jun 24 0:00 1093 -4:00 - %z 2013 Nov 10 1094 -5:00 - %z 1095 1096 # Chile 1097 1098 # From Paul Eggert (2022-03-15): 1099 # Shanks & Pottenger says America/Santiago introduced standard time in 1100 # 1890 and rounds its UT offset to 70W40; guess that in practice this 1101 # was the same offset as in 1916-1919. It also says Pacific/Easter 1102 # standardized on 109W22 in 1890; assume this didn't change the clocks. 1103 # 1104 # Dates for America/Santiago from 1910 to 2004 are primarily from 1105 # the following source, cited by Oscar van Vlijmen (2006-10-08): 1106 # [1] Chile Law 1107 # http://www.webexhibits.org/daylightsaving/chile.html 1108 # This contains a copy of this official table: 1109 # Cambios en la hora oficial de Chile desde 1900 (retrieved 2008-03-30) 1110 # https://web.archive.org/web/20080330200901/http://www.horaoficial.cl/cambio.htm 1111 # [1] needs several corrections, though. 1112 # 1113 # The first set of corrections is from: 1114 # [2] History of the Official Time of Chile 1115 # http://www.horaoficial.cl/ing/horaof_ing.html (retrieved 2012-03-06). See: 1116 # https://web.archive.org/web/20120306042032/http://www.horaoficial.cl/ing/horaof_ing.html 1117 # This is an English translation of: 1118 # Historia de la hora oficial de Chile (retrieved 2012-10-24). See: 1119 # https://web.archive.org/web/20121024234627/http://www.horaoficial.cl/horaof.htm 1120 # A fancier Spanish version (requiring mouse-clicking) is at: 1121 # http://www.horaoficial.cl/historia_hora.php 1122 # Conflicts between [1] and [2] were resolved as follows: 1123 # 1124 # - [1] says the 1910 transition was Jan 1, [2] says Jan 10 and cites 1125 # Boletn No. 1, Aviso No. 1 (1910). Go with [2]. 1126 # 1127 # - [1] says SMT was -4:42:45, [2] says Chile's official time from 1128 # 1916 to 1919 was -4:42:46.3, the meridian of Chile's National 1129 # Astronomical Observatory (OAN), then located in what is now 1130 # Quinta Normal in Santiago. Go with [1], as this matches the meridian 1131 # referred to by the relevant Chilean laws to this day. 1132 # 1133 # - [1] says the 1918 transition was Sep 1, [2] says Sep 10 and cites 1134 # Boletn No. 22, Aviso No. 129/1918 (1918-08-23). Go with [2]. 1135 # 1136 # - [1] does not give times for transitions; assume they occur 1137 # at midnight mainland time, the current common practice. However, 1138 # go with [2]'s specification of 23:00 for the 1947-05-21 transition. 1139 # 1140 # Another correction to [1] is from Jesper Nrgaard Welen, who 1141 # wrote (2006-10-08), "I think that there are some obvious mistakes in 1142 # the suggested link from Oscar van Vlijmen,... for instance entry 66 1143 # says that GMT-4 ended 1990-09-12 while entry 67 only begins GMT-3 at 1144 # 1990-09-15 (they should have been 1990-09-15 and 1990-09-16 1145 # respectively), but anyhow it clears up some doubts too." 1146 # 1147 # Data for Pacific/Easter from 1910 through 1967 come from Shanks & 1148 # Pottenger. After that, for lack of better info assume 1149 # Pacific/Easter is always two hours behind America/Santiago; 1150 # this is known to work for DST transitions starting in 2008 and 1151 # may well be true for earlier transitions. 1152 1153 # From Tim Parenti (2022-07-06): 1154 # For a brief period of roughly six weeks in 1946, DST was only observed on an 1155 # emergency basis in specific regions of central Chile; namely, "the national 1156 # territory between the provinces of Coquimbo and Concepcin, inclusive". 1157 # This was enacted by Decree 3,891, dated 1946-07-13, and took effect 1158 # 1946-07-14 24:00, advancing these central regions to -03. 1159 # https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19460715/#page/1 1160 # The decree contemplated "[t]hat this advancement of the Official Time, even 1161 # though it has been proposed for the cities of Santiago and Valparaso only, 1162 # must be agreed with that of other cities, due to the connection of various 1163 # activities that require it, such as, for example, the operation of rail 1164 # services". It was originally set to expire after 30 days but was extended 1165 # through 1946-08-31 by Decree 4,506, dated 1946-08-13. 1166 # https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19460814/#page/1 1167 # 1168 # Law Number 8,522, promulgated 1946-08-27, reunified Chilean clocks at their 1169 # new "Summer Time" of -04, reckoned as that of "the meridian of the 1170 # Astronomical Observatory of Lo Espejo, advanced by 42 minutes and 45 1171 # seconds". Although this law specified the new Summer Time to start on 1 1172 # September each year, a special "transitional article" started it a few days 1173 # early, as soon as the law took effect. As the law was to take force "from 1174 # the date of its publication in the 'Diario Oficial', which happened the 1175 # following day, presume the change took place in Santiago and its environs 1176 # from 24:00 -03 to 23:00 -04 on Wednesday 1946-08-28. Although this was a 1177 # no-op for wall clocks in the north and south of the country, put their formal 1178 # start to DST an hour later when they reached 24:00 -04. 1179 # https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19460828/#page/1 1180 # After a brief "Winter Time" stint at -05 beginning 1947-04-01, Law Number 1181 # 8,777, promulgated 1947-05-17, established year-round -04 "from 23:00 on the 1182 # second day after it is published in the 'Diario Oficial'." It was published 1183 # on Monday 1947-05-19 and so took effect from Wednesday 1947-05-21 23:00. 1184 # https://www.diariooficial.interior.gob.cl/versiones-anteriores/do-h/19470519/#page/1 1185 1186 # From Eduardo Krell (1995-10-19): 1187 # The law says to switch to DST at midnight [24:00] on the second SATURDAY 1188 # of October.... The law is the same for March and October. 1189 # (1998-09-29): 1190 # Because of the drought this year, the government decided to go into 1191 # DST earlier (saturday 9/26 at 24:00). This is a one-time change only ... 1192 # (unless there's another dry season next year, I guess). 1193 1194 # From Julio I. Pacheco Troncoso (1999-03-18): 1195 # Because of the same drought, the government decided to end DST later, 1196 # on April 3, (one-time change). 1197 1198 # From Germn Poo-Caamao (2008-03-03): 1199 # Due to drought, Chile extends Daylight Time in three weeks. This 1200 # is one-time change (Saturday 3/29 at 24:00 for America/Santiago 1201 # and Saturday 3/29 at 22:00 for Pacific/Easter) 1202 # The Supreme Decree is located at 1203 # http://www.shoa.cl/servicios/supremo316.pdf 1204 # 1205 # From Jos Miguel Garrido (2008-03-05): 1206 # http://www.shoa.cl/noticias/2008/04hora/hora.htm 1207 1208 # From Angel Chiang (2010-03-04): 1209 # Subject: DST in Chile exceptionally extended to 3 April due to earthquake 1210 # http://www.gobiernodechile.cl/viewNoticia.aspx?idArticulo=30098 1211 # 1212 # From Arthur David Olson (2010-03-06): 1213 # Angel Chiang's message confirmed by Julio Pacheco; Julio provided a patch. 1214 1215 # From Glenn Eychaner (2011-03-28): 1216 # http://diario.elmercurio.com/2011/03/28/_portada/_portada/noticias/7565897A-CA86-49E6-9E03-660B21A4883E.htm?id=3D{7565897A-CA86-49E6-9E03-660B21A4883E} 1217 # In English: 1218 # Chile's clocks will go back an hour this year on the 7th of May instead 1219 # of this Saturday. They will go forward again the 3rd Saturday in 1220 # August, not in October as they have since 1968. 1221 1222 # From Mauricio Parada (2012-02-22), translated by Glenn Eychaner (2012-02-23): 1223 # As stated in the website of the Chilean Energy Ministry 1224 # http://www.minenergia.cl/ministerio/noticias/generales/gobierno-anuncia-fechas-de-cambio-de.html 1225 # The Chilean Government has decided to postpone the entrance into winter time 1226 # (to leave DST) from March 11 2012 to April 28th 2012.... 1227 # Quote from the website communication: 1228 # 1229 # 6. For the year 2012, the dates of entry into winter time will be as follows: 1230 # a. Saturday April 28, 2012, clocks should go back 60 minutes; that is, at 1231 # 23:59:59, instead of passing to 0:00, the time should be adjusted to be 23:00 1232 # of the same day. 1233 # b. Saturday, September 1, 2012, clocks should go forward 60 minutes; that is, 1234 # at 23:59:59, instead of passing to 0:00, the time should be adjusted to be 1235 # 01:00 on September 2. 1236 1237 # From Steffen Thorsen (2013-02-15): 1238 # According to several news sources, Chile has extended DST this year, 1239 # they will end DST later and start DST earlier than planned. They 1240 # hope to save energy. The new end date is 2013-04-28 00:00 and new 1241 # start date is 2013-09-08 00:00.... 1242 # http://www.gob.cl/informa/2013/02/15/gobierno-anuncia-fechas-de-cambio-de-hora-para-el-ano-2013.htm 1243 1244 # From Jos Miguel Garrido (2014-02-19): 1245 # Today appeared in the Diario Oficial a decree amending the time change 1246 # dates to 2014. 1247 # DST End: last Saturday of April 2014 (Sun 27 Apr 2014 03:00 UTC) 1248 # DST Start: first Saturday of September 2014 (Sun 07 Sep 2014 04:00 UTC) 1249 # http://www.diariooficial.interior.gob.cl//media/2014/02/19/do-20140219.pdf 1250 1251 # From Eduardo Romero Urra (2015-03-03): 1252 # Today has been published officially that Chile will use the DST time 1253 # permanently until March 25 of 2017 1254 # http://www.diariooficial.interior.gob.cl/media/2015/03/03/1-large.jpg 1255 # 1256 # From Paul Eggert (2015-03-03): 1257 # For now, assume that the extension will persist indefinitely. 1258 1259 # From Juan Correa (2016-03-18): 1260 # The decree regarding DST has been published in today's Official Gazette: 1261 # http://www.diariooficial.interior.gob.cl/versiones-anteriores/do/20160318/ 1262 # http://www.leychile.cl/Navegar?idNorma=1088502 1263 # It does consider the second Saturday of May and August as the dates 1264 # for the transition; and it lists DST dates until 2019, but I think 1265 # this scheme will stick. 1266 # 1267 # From Paul Eggert (2016-03-18): 1268 # For now, assume the pattern holds for the indefinite future. 1269 # The decree says transitions occur at 24:00; in practice this appears 1270 # to mean 24:00 mainland time, not 24:00 local time, so that Easter 1271 # Island is always two hours behind the mainland. 1272 1273 # From Juan Correa (2016-12-04): 1274 # Magallanes region ... will keep DST (UTC -3) all year round.... 1275 # 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 1276 # From Deborah Goldsmith (2017-01-19): 1277 # http://www.diariooficial.interior.gob.cl/publicaciones/2017/01/17/41660/01/1169626.pdf 1278 1279 # From Juan Correa (2018-08-13): 1280 # As of moments ago, the Ministry of Energy in Chile has announced the new 1281 # schema for DST. ... Announcement in video (in Spanish): 1282 # https://twitter.com/MinEnergia/status/1029000399129374720 1283 # From Yonathan Dossow (2018-08-13): 1284 # The video says "first Saturday of September", we all know it means Sunday at 1285 # midnight. 1286 # From Tim Parenti (2018-08-13): 1287 # Translating the captions on the video at 0:44-0:55, "We want to announce as 1288 # Government that from 2019, Winter Time will be increased to 5 months, between 1289 # the first Saturday of April and the first Saturday of September." 1290 # At 2:08-2:20, "The Magallanes region will maintain its current time, as 1291 # decided by the citizens during 2017, but our Government will promote a 1292 # regional dialogue table to gather their opinion on this matter." 1293 # https://twitter.com/MinEnergia/status/1029009354001973248 1294 # "We will keep the new time policy unchanged for at least the next 4 years." 1295 # So we extend the new rules on Saturdays at 24:00 mainland time indefinitely. 1296 # From Juan Correa (2019-02-04): 1297 # http://www.diariooficial.interior.gob.cl/publicaciones/2018/11/23/42212/01/1498738.pdf 1298 1299 # From Juan Correa (2022-04-02): 1300 # I found there was a decree published last Thursday that will keep 1301 # Magallanes region to UTC -3 "indefinitely". The decree is available at 1302 # https://www.diariooficial.interior.gob.cl/publicaciones/2022/03/31/43217-B/01/2108910.pdf 1303 1304 # From Juan Correa (2022-08-09): 1305 # the Internal Affairs Ministry (Ministerio del Interior) informed DST 1306 # for America/Santiago will start on midnight of September 11th; 1307 # and will end on April 1st, 2023. Magallanes region (America/Punta_Arenas) 1308 # will keep UTC -3 "indefinitely"... This is because on September 4th 1309 # we will have a voting whether to approve a new Constitution. 1310 # 1311 # From Eduardo Romero Urra (2022-08-17): 1312 # https://www.diariooficial.interior.gob.cl/publicaciones/2022/08/13/43327/01/2172567.pdf 1313 # 1314 # From Paul Eggert (2022-08-17): 1315 # Although the presidential decree stops at fall 2026, assume that 1316 # similar DST rules will continue thereafter. 1317 1318 # Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1319 Rule Chile 1927 1931 - Sep 1 0:00 1:00 - 1320 Rule Chile 1928 1932 - Apr 1 0:00 0 - 1321 Rule Chile 1968 only - Nov 3 4:00u 1:00 - 1322 Rule Chile 1969 only - Mar 30 3:00u 0 - 1323 Rule Chile 1969 only - Nov 23 4:00u 1:00 - 1324 Rule Chile 1970 only - Mar 29 3:00u 0 - 1325 Rule Chile 1971 only - Mar 14 3:00u 0 - 1326 Rule Chile 1970 1972 - Oct Sun>=9 4:00u 1:00 - 1327 Rule Chile 1972 1986 - Mar Sun>=9 3:00u 0 - 1328 Rule Chile 1973 only - Sep 30 4:00u 1:00 - 1329 Rule Chile 1974 1987 - Oct Sun>=9 4:00u 1:00 - 1330 Rule Chile 1987 only - Apr 12 3:00u 0 - 1331 Rule Chile 1988 1990 - Mar Sun>=9 3:00u 0 - 1332 Rule Chile 1988 1989 - Oct Sun>=9 4:00u 1:00 - 1333 Rule Chile 1990 only - Sep 16 4:00u 1:00 - 1334 Rule Chile 1991 1996 - Mar Sun>=9 3:00u 0 - 1335 Rule Chile 1991 1997 - Oct Sun>=9 4:00u 1:00 - 1336 Rule Chile 1997 only - Mar 30 3:00u 0 - 1337 Rule Chile 1998 only - Mar Sun>=9 3:00u 0 - 1338 Rule Chile 1998 only - Sep 27 4:00u 1:00 - 1339 Rule Chile 1999 only - Apr 4 3:00u 0 - 1340 Rule Chile 1999 2010 - Oct Sun>=9 4:00u 1:00 - 1341 Rule Chile 2000 2007 - Mar Sun>=9 3:00u 0 - 1342 # N.B.: the end of March 29 in Chile is March 30 in Universal time, 1343 # which is used below in specifying the transition. 1344 Rule Chile 2008 only - Mar 30 3:00u 0 - 1345 Rule Chile 2009 only - Mar Sun>=9 3:00u 0 - 1346 Rule Chile 2010 only - Apr Sun>=1 3:00u 0 - 1347 Rule Chile 2011 only - May Sun>=2 3:00u 0 - 1348 Rule Chile 2011 only - Aug Sun>=16 4:00u 1:00 - 1349 Rule Chile 2012 2014 - Apr Sun>=23 3:00u 0 - 1350 Rule Chile 2012 2014 - Sep Sun>=2 4:00u 1:00 - 1351 Rule Chile 2016 2018 - May Sun>=9 3:00u 0 - 1352 Rule Chile 2016 2018 - Aug Sun>=9 4:00u 1:00 - 1353 Rule Chile 2019 max - Apr Sun>=2 3:00u 0 - 1354 Rule Chile 2019 2021 - Sep Sun>=2 4:00u 1:00 - 1355 Rule Chile 2022 only - Sep Sun>=9 4:00u 1:00 - 1356 Rule Chile 2023 max - Sep Sun>=2 4:00u 1:00 - 1357 # IATA SSIM anomalies: (1992-02) says 1992-03-14; 1358 # (1996-09) says 1998-03-08. Ignore these. 1359 # Zone NAME STDOFF RULES FORMAT [UNTIL] 1360 Zone America/Santiago -4:42:45 - LMT 1890 1361 -4:42:45 - SMT 1910 Jan 10 # Santiago Mean Time 1362 -5:00 - %z 1916 Jul 1 1363 -4:42:45 - SMT 1918 Sep 10 1364 -4:00 - %z 1919 Jul 1 1365 -4:42:45 - SMT 1927 Sep 1 1366 -5:00 Chile %z 1932 Sep 1 1367 -4:00 - %z 1942 Jun 1 1368 -5:00 - %z 1942 Aug 1 1369 -4:00 - %z 1946 Jul 14 24:00 1370 -4:00 1:00 %z 1946 Aug 28 24:00 # central CL 1371 -5:00 1:00 %z 1947 Mar 31 24:00 1372 -5:00 - %z 1947 May 21 23:00 1373 -4:00 Chile %z 1374 Zone America/Punta_Arenas -4:43:40 - LMT 1890 1375 -4:42:45 - SMT 1910 Jan 10 1376 -5:00 - %z 1916 Jul 1 1377 -4:42:45 - SMT 1918 Sep 10 1378 -4:00 - %z 1919 Jul 1 1379 -4:42:45 - SMT 1927 Sep 1 1380 -5:00 Chile %z 1932 Sep 1 1381 -4:00 - %z 1942 Jun 1 1382 -5:00 - %z 1942 Aug 1 1383 -4:00 - %z 1946 Aug 28 24:00 1384 -5:00 1:00 %z 1947 Mar 31 24:00 1385 -5:00 - %z 1947 May 21 23:00 1386 -4:00 Chile %z 2016 Dec 4 1387 -3:00 - %z 1388 Zone Pacific/Easter -7:17:28 - LMT 1890 1389 -7:17:28 - EMT 1932 Sep # Easter Mean Time 1390 -7:00 Chile %z 1982 Mar 14 3:00u # Easter Time 1391 -6:00 Chile %z 1392 # 1393 # Salas y Gmez Island is uninhabited. 1394 # Other Chilean locations, including Juan Fernndez Is, Desventuradas Is, 1395 # and Antarctic bases, are like America/Santiago. 1396 1397 # Antarctic base using South American rules 1398 # (See the file 'antarctica' for more.) 1399 # 1400 # Palmer, Anvers Island, since 1965 (moved 2 miles in 1968) 1401 # 1402 # From Ethan Dicks (1996-10-06): 1403 # It keeps the same time as Punta Arenas, Chile, because, just like us 1404 # and the South Pole, that's the other end of their supply line.... 1405 # I verified with someone who was there that since 1980, 1406 # Palmer has followed Chile. Prior to that, before the Falklands War, 1407 # Palmer used to be supplied from Argentina. 1408 # 1409 # Zone NAME STDOFF RULES FORMAT [UNTIL] 1410 Zone Antarctica/Palmer 0 - -00 1965 1411 -4:00 Arg %z 1969 Oct 5 1412 -3:00 Arg %z 1982 May 1413 -4:00 Chile %z 2016 Dec 4 1414 -3:00 - %z 1415 1416 # Colombia 1417 1418 # Milne gives 4:56:16.4 for Bogot time in 1899. He writes, 1419 # "A variation of fifteen minutes in the public clocks of Bogota is not rare." 1420 1421 # From Alois Treindl (2022-11-10): 1422 # End of time change in Colombia 1993 ... should be 6 February 24h ... 1423 # DECRETO 267 DE 1993 1424 # https://www.suin-juriscol.gov.co/viewDocument.asp?ruta=Decretos/1061335 1425 1426 # Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1427 Rule CO 1992 only - May 3 0:00 1:00 - 1428 Rule CO 1993 only - Feb 6 24:00 0 - 1429 # Zone NAME STDOFF RULES FORMAT [UNTIL] 1430 #STDOFF -4:56:16.4 1431 Zone America/Bogota -4:56:16 - LMT 1884 Mar 13 1432 -4:56:16 - BMT 1914 Nov 23 # Bogot Mean Time 1433 -5:00 CO %z 1434 # Malpelo, Providencia, San Andres 1435 # no information; probably like America/Bogota 1436 1437 1438 # Ecuador 1439 # 1440 # Milne says the Central and South American Telegraph Company used -5:24:15. 1441 # 1442 # From Alois Treindl (2016-12-15): 1443 # https://www.elcomercio.com/actualidad/hora-sixto-1993.html 1444 # ... Whether the law applied also to Galpagos, I do not know. 1445 # From Paul Eggert (2016-12-15): 1446 # https://www.elcomercio.com/afull/modificacion-husohorario-ecuador-presidentes-decreto.html 1447 # This says President Sixto Durn Balln signed decree No. 285, which 1448 # established DST from 1992-11-28 to 1993-02-05; it does not give transition 1449 # times. The people called it "hora de Sixto" ("Sixto hour"). The change did 1450 # not go over well; a popular song "Qu hora es" by Jaime Guevara had lyrics 1451 # that included "Amaneca en mitad de la noche, los guaguas iban a clase sin 1452 # sol" ("It was dawning in the middle of the night, the buses went to class 1453 # without sun"). Although Balln's campaign slogan was "Ni un paso atrs" 1454 # (Not one step back), the clocks went back in 1993 and the experiment was not 1455 # repeated. For now, assume transitions were at 00:00 local time country-wide. 1456 # 1457 # Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1458 Rule Ecuador 1992 only - Nov 28 0:00 1:00 - 1459 Rule Ecuador 1993 only - Feb 5 0:00 0 - 1460 # 1461 # Zone NAME STDOFF RULES FORMAT [UNTIL] 1462 Zone America/Guayaquil -5:19:20 - LMT 1890 1463 -5:14:00 - QMT 1931 # Quito Mean Time 1464 -5:00 Ecuador %z 1465 Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno 1466 -5:00 - %z 1986 1467 -6:00 Ecuador %z 1468 1469 # Falklands 1470 1471 # From Paul Eggert (2006-03-22): 1472 # Between 1990 and 2000 inclusive, Shanks & Pottenger and the IATA agree except 1473 # the IATA gives 1996-09-08. Go with Shanks & Pottenger. 1474 1475 # From Falkland Islands Government Office, London (2001-01-22) 1476 # via Jesper Nrgaard: 1477 # ... the clocks revert back to Local Mean Time at 2 am on Sunday 15 1478 # April 2001 and advance one hour to summer time at 2 am on Sunday 2 1479 # September. It is anticipated that the clocks will revert back at 2 1480 # am on Sunday 21 April 2002 and advance to summer time at 2 am on 1481 # Sunday 1 September. 1482 1483 # From Rives McDow (2001-02-13): 1484 # 1485 # I have communicated several times with people there, and the last 1486 # time I had communications that was helpful was in 1998. Here is 1487 # what was said then: 1488 # 1489 # "The general rule was that Stanley used daylight saving and the Camp 1490 # did not. However for various reasons many people in the Camp have 1491 # started to use daylight saving (known locally as 'Stanley Time') 1492 # There is no rule as to who uses daylight saving - it is a matter of 1493 # personal choice and so it is impossible to draw a map showing who 1494 # uses it and who does not. Any list would be out of date as soon as 1495 # it was produced. This year daylight saving ended on April 18/19th 1496 # and started again on September 12/13th. I do not know what the rule 1497 # is, but can find out if you like. We do not change at the same time 1498 # as UK or Chile." 1499 # 1500 # I did have in my notes that the rule was "Second Saturday in Sep at 1501 # 0:00 until third Saturday in Apr at 0:00". I think that this does 1502 # not agree in some cases with Shanks; is this true? 1503 # 1504 # Also, there is no mention in the list that some areas in the 1505 # Falklands do not use DST. I have found in my communications there 1506 # that these areas are on the western half of East Falkland and all of 1507 # West Falkland. Stanley is the only place that consistently observes 1508 # DST. Again, as in other places in the world, the farmers don't like 1509 # it. West Falkland is almost entirely sheep farmers. 1510 # 1511 # I know one lady there that keeps a list of which farm keeps DST and 1512 # which doesn't each year. She runs a shop in Stanley, and says that 1513 # the list changes each year. She uses it to communicate to her 1514 # customers, catching them when they are home for lunch or dinner. 1515 1516 # From Paul Eggert (2001-03-05): 1517 # For now, we'll just record the time in Stanley, since we have no 1518 # better info. 1519 1520 # From Steffen Thorsen (2011-04-01): 1521 # The Falkland Islands will not turn back clocks this winter, but stay on 1522 # daylight saving time. 1523 # 1524 # One source: 1525 # http://www.falklandnews.com/public/story.cfm?get=5914&source=3 1526 # 1527 # We have gotten this confirmed by a clerk of the legislative assembly: 1528 # Normally the clocks revert to Local Mean Time (UTC/GMT -4 hours) on the 1529 # third Sunday of April at 0200hrs and advance to Summer Time (UTC/GMT -3 1530 # hours) on the first Sunday of September at 0200hrs. 1531 # 1532 # IMPORTANT NOTE: During 2011, on a trial basis, the Falkland Islands 1533 # will not revert to local mean time, but clocks will remain on Summer 1534 # time (UTC/GMT - 3 hours) throughout the whole of 2011. Any long term 1535 # change to local time following the trial period will be notified. 1536 # 1537 # From Andrew Newman (2012-02-24) 1538 # A letter from Justin McPhee, Chief Executive, 1539 # Cable & Wireless Falkland Islands (dated 2012-02-22) 1540 # states... 1541 # The current Atlantic/Stanley entry under South America expects the 1542 # clocks to go back to standard Falklands Time (FKT) on the 15th April. 1543 # The database entry states that in 2011 Stanley was staying on fixed 1544 # summer time on a trial basis only. FIG need to contact IANA and/or 1545 # the maintainers of the database to inform them we're adopting 1546 # the same policy this year and suggest recommendations for future years. 1547 # 1548 # For now we will assume permanent -03 for the Falklands 1549 # until advised differently (to apply for 2012 and beyond, after the 2011 1550 # experiment was apparently successful.) 1551 # Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1552 Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 - 1553 Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 - 1554 Rule Falk 1939 only - Oct 1 0:00 1:00 - 1555 Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 - 1556 Rule Falk 1943 only - Jan 1 0:00 0 - 1557 Rule Falk 1983 only - Sep lastSun 0:00 1:00 - 1558 Rule Falk 1984 1985 - Apr lastSun 0:00 0 - 1559 Rule Falk 1984 only - Sep 16 0:00 1:00 - 1560 Rule Falk 1985 2000 - Sep Sun>=9 0:00 1:00 - 1561 Rule Falk 1986 2000 - Apr Sun>=16 0:00 0 - 1562 Rule Falk 2001 2010 - Apr Sun>=15 2:00 0 - 1563 Rule Falk 2001 2010 - Sep Sun>=1 2:00 1:00 - 1564 # Zone NAME STDOFF RULES FORMAT [UNTIL] 1565 Zone Atlantic/Stanley -3:51:24 - LMT 1890 1566 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time 1567 -4:00 Falk %z 1983 May 1568 -3:00 Falk %z 1985 Sep 15 1569 -4:00 Falk %z 2010 Sep 5 2:00 1570 -3:00 - %z 1571 1572 # French Guiana 1573 # For the 1911/1912 establishment of standard time in French possessions, see: 1574 # Socit Franaise de Physique, Recueil de constantes physiques (1913), 1575 # page 752, 18b. 1576 # Zone NAME STDOFF RULES FORMAT [UNTIL] 1577 Zone America/Cayenne -3:29:20 - LMT 1911 Jul 1 1578 -4:00 - %z 1967 Oct 1579 -3:00 - %z 1580 1581 # Guyana 1582 1583 # From P Chan (2020-11-27): 1584 # https://books.google.com/books?id=5-5CAQAAMAAJ&pg=SA1-PA547 1585 # The Official Gazette of British Guiana. (New Series.) Vol. XL. July to 1586 # December, 1915, p 1547, lists as several notes: 1587 # "Local Mean Time 3 hours 52 mins. 39 secs. slow of Greenwich Mean Time 1588 # (Georgetown.) From 1st August, 1911, British Guiana Standard Mean Time 4 1589 # hours slow of Greenwich Mean Time, by notice in Official Gazette on 1st July, 1590 # 1911. From 1st March, 1915, British Guiana Standard Mean Time 3 hours 45 1591 # mins. 0 secs. slow of Greenwich Mean Time, by notice in Official Gazette on 1592 # 23rd January, 1915." 1593 # 1594 # https://parliament.gov.gy/documents/acts/10923-act_no._27_of_1975_-_interpretation_and_general_clauses_(amendment)_act_1975.pdf 1595 # Interpretation and general clauses (Amendment) Act 1975 (Act No. 27 of 1975) 1596 # [dated 1975-07-31] 1597 # "This Act...shall come into operation on 1st August, 1975." 1598 # "...where any expression of time occurs...the time referred to shall signify 1599 # the standard time of Guyana which shall be three hours behind Greenwich Mean 1600 # Time." 1601 # 1602 # Circular No. 10/1992 dated 1992-03-20 1603 # https://dps.gov.gy/wp-content/uploads/2018/12/1992-03-20-Circular-010.pdf 1604 # "...cabinet has decided that with effect from Sunday 29th March, 1992, Guyana 1605 # Standard Time would be re-established at 01:00 hours by adjusting the hands 1606 # of the clock back to 24:00 hours." 1607 # Legislated in the Interpretation and general clauses (Amendment) Act 1992 1608 # (Act No. 6 of 1992) [passed 1992-03-27, published 1992-04-18] 1609 # https://parliament.gov.gy/documents/acts/5885-6_of_1992_interpretation_and_general_clauses_(amendment)_act_1992.pdf 1610 1611 # Zone NAME STDOFF RULES FORMAT [UNTIL] 1612 Zone America/Guyana -3:52:39 - LMT 1911 Aug 1 # Georgetown 1613 -4:00 - %z 1915 Mar 1 1614 -3:45 - %z 1975 Aug 1 1615 -3:00 - %z 1992 Mar 29 1:00 1616 -4:00 - %z 1617 1618 # Paraguay 1619 # 1620 # From Paul Eggert (2006-03-22): 1621 # Shanks & Pottenger say that spring transitions are 01:00 -> 02:00, 1622 # and autumn transitions are 00:00 -> 23:00. Go with pre-1999 1623 # editions of Shanks, and with the IATA, who say transitions occur at 00:00. 1624 # 1625 # From Waldemar Villamayor-Venialbo (2013-09-20): 1626 # No time of the day is established for the adjustment, so people normally 1627 # adjust their clocks at 0 hour of the given dates. 1628 # 1629 # Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1630 Rule Para 1975 1988 - Oct 1 0:00 1:00 - 1631 Rule Para 1975 1978 - Mar 1 0:00 0 - 1632 Rule Para 1979 1991 - Apr 1 0:00 0 - 1633 Rule Para 1989 only - Oct 22 0:00 1:00 - 1634 Rule Para 1990 only - Oct 1 0:00 1:00 - 1635 Rule Para 1991 only - Oct 6 0:00 1:00 - 1636 Rule Para 1992 only - Mar 1 0:00 0 - 1637 Rule Para 1992 only - Oct 5 0:00 1:00 - 1638 Rule Para 1993 only - Mar 31 0:00 0 - 1639 Rule Para 1993 1995 - Oct 1 0:00 1:00 - 1640 Rule Para 1994 1995 - Feb lastSun 0:00 0 - 1641 Rule Para 1996 only - Mar 1 0:00 0 - 1642 # IATA SSIM (2000-02) says 1999-10-10; ignore this for now. 1643 # From Steffen Thorsen (2000-10-02): 1644 # I have three independent reports that Paraguay changed to DST this Sunday 1645 # (10-01). 1646 # 1647 # Translated by Gwillim Law (2001-02-27) from 1648 # Noticias, a daily paper in Asuncin, Paraguay (2000-10-01): 1649 # http://www.diarionoticias.com.py/011000/nacional/naciona1.htm 1650 # Starting at 0:00 today, the clock will be set forward 60 minutes, in 1651 # fulfillment of Decree No. 7,273 of the Executive Power.... The time change 1652 # system has been operating for several years. Formerly there was a separate 1653 # decree each year; the new law has the same effect, but permanently. Every 1654 # year, the time will change on the first Sunday of October; likewise, the 1655 # clock will be set back on the first Sunday of March. 1656 # 1657 Rule Para 1996 2001 - Oct Sun>=1 0:00 1:00 - 1658 # IATA SSIM (1997-09) says Mar 1; go with Shanks & Pottenger. 1659 Rule Para 1997 only - Feb lastSun 0:00 0 - 1660 # Shanks & Pottenger say 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but 1661 # (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27). 1662 Rule Para 1998 2001 - Mar Sun>=1 0:00 0 - 1663 # From Rives McDow (2002-02-28): 1664 # A decree was issued in Paraguay (No. 16350) on 2002-02-26 that changed the 1665 # dst method to be from the first Sunday in September to the first Sunday in 1666 # April. 1667 Rule Para 2002 2004 - Apr Sun>=1 0:00 0 - 1668 Rule Para 2002 2003 - Sep Sun>=1 0:00 1:00 - 1669 # 1670 # From Jesper Nrgaard Welen (2005-01-02): 1671 # There are several sources that claim that Paraguay made 1672 # a timezone rule change in autumn 2004. 1673 # From Steffen Thorsen (2005-01-05): 1674 # Decree 1,867 (2004-03-05) 1675 # From Carlos Ral Perasso via Jesper Nrgaard Welen (2006-10-13) 1676 # http://www.presidencia.gov.py/decretos/D1867.pdf 1677 Rule Para 2004 2009 - Oct Sun>=15 0:00 1:00 - 1678 Rule Para 2005 2009 - Mar Sun>=8 0:00 0 - 1679 # From Carlos Ral Perasso (2010-02-18): 1680 # By decree number 3958 issued yesterday 1681 # http://www.presidencia.gov.py/v1/wp-content/uploads/2010/02/decreto3958.pdf 1682 # Paraguay changes its DST schedule, postponing the March rule to April and 1683 # modifying the October date. The decree reads: 1684 # ... 1685 # Art. 1. It is hereby established that from the second Sunday of the month of 1686 # April of this year (2010), the official time is to be set back 60 minutes, 1687 # and that on the first Sunday of the month of October, it is to be set 1688 # forward 60 minutes, in all the territory of the Paraguayan Republic. 1689 # ... 1690 Rule Para 2010 2024 - Oct Sun>=1 0:00 1:00 - 1691 Rule Para 2010 2012 - Apr Sun>=8 0:00 0 - 1692 # 1693 # From Steffen Thorsen (2013-03-07): 1694 # Paraguay will end DST on 2013-03-24 00:00.... 1695 # http://www.ande.gov.py/interna.php?id=1075 1696 # 1697 # From Carlos Ral Perasso (2013-03-15): 1698 # The change in Paraguay is now final. Decree number 10780 1699 # http://www.presidencia.gov.py/uploads/pdf/presidencia-3b86ff4b691c79d4f5927ca964922ec74772ce857c02ca054a52a37b49afc7fb.pdf 1700 # From Carlos Ral Perasso (2014-02-28): 1701 # Decree 1264 can be found at: 1702 # http://www.presidencia.gov.py/archivos/documentos/DECRETO1264_ey9r8zai.pdf 1703 # 1704 # From Paul Eggert (2023-07-26): 1705 # Transition dates are now set by Law No. 7115, not by presidential decree. 1706 # https://www.abc.com.py/politica/2023/07/12/promulgacion-el-cambio-de-hora-sera-por-ley/ 1707 # From Carlos Ral Perasso (2023-07-27): 1708 # http://silpy.congreso.gov.py/descarga/ley-144138 1709 Rule Para 2013 2024 - Mar Sun>=22 0:00 0 - 1710 # 1711 # From Heitor David Pinto (2024-09-24): 1712 # Today the Congress of Paraguay passed a bill to observe UTC-3 permanently.... 1713 # The text of the bill says that it would enter into force on the first 1714 # Sunday in October 2024, the same date currently scheduled to start DST.... 1715 # https://silpy.congreso.gov.py/web/expediente/132531 1716 # (2024-10-14): 1717 # The president approved the law on 11 October 2024, 1718 # and it was officially published on 14 October 2024. 1719 # https://www.gacetaoficial.gov.py/index/detalle_publicacion/89723 1720 # The text of the law says that it enters into force on the first 1721 # Sunday in October 2024 (6 October 2024). But the constitution 1722 # prohibits retroactive effect, and the civil code says that laws 1723 # enter into force on the day after their publication or on the day 1724 # that they specify, and it also says that they don't have retroactive 1725 # effect. So I think that the time change on 6 October 2024 should 1726 # still be considered as DST according to the previous law, and 1727 # permanently UTC-3 from 15 October 2024 according to the new law.... 1728 # https://www.constituteproject.org/constitution/Paraguay_2011 1729 # https://www.oas.org/dil/esp/codigo_civil_paraguay.pdf 1730 1731 # Zone NAME STDOFF RULES FORMAT [UNTIL] 1732 Zone America/Asuncion -3:50:40 - LMT 1890 1733 -3:50:40 - AMT 1931 Oct 10 # Asuncin Mean Time 1734 -4:00 - %z 1972 Oct 1735 -3:00 - %z 1974 Apr 1736 -4:00 Para %z 2024 Oct 15 1737 -3:00 - %z 1738 1739 # Peru 1740 # 1741 # From Evelyn C. Leeper via Mark Brader (2003-10-26) 1742 # <news:xrGmb.39935$gA1.13896113 (a] news4.srv.hcvlny.cv.net>: 1743 # When we were in Peru in 1985-1986, they apparently switched over 1744 # sometime between December 29 and January 3 while we were on the Amazon. 1745 # 1746 # From Paul Eggert (2006-03-22): 1747 # Shanks & Pottenger don't have this transition. Assume 1986 was like 1987. 1748 1749 # Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1750 Rule Peru 1938 only - Jan 1 0:00 1:00 - 1751 Rule Peru 1938 only - Apr 1 0:00 0 - 1752 Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 - 1753 Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 - 1754 Rule Peru 1986 1987 - Jan 1 0:00 1:00 - 1755 Rule Peru 1986 1987 - Apr 1 0:00 0 - 1756 Rule Peru 1990 only - Jan 1 0:00 1:00 - 1757 Rule Peru 1990 only - Apr 1 0:00 0 - 1758 # IATA is ambiguous for 1993/1995; go with Shanks & Pottenger. 1759 Rule Peru 1994 only - Jan 1 0:00 1:00 - 1760 Rule Peru 1994 only - Apr 1 0:00 0 - 1761 # Zone NAME STDOFF RULES FORMAT [UNTIL] 1762 Zone America/Lima -5:08:12 - LMT 1890 1763 -5:08:36 - LMT 1908 Jul 28 # Lima Mean Time? 1764 -5:00 Peru %z 1765 1766 # South Georgia 1767 # Zone NAME STDOFF RULES FORMAT [UNTIL] 1768 Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken 1769 -2:00 - %z 1770 1771 # South Sandwich Is 1772 # uninhabited; scientific personnel have wintered 1773 1774 # Suriname 1775 # Zone NAME STDOFF RULES FORMAT [UNTIL] 1776 Zone America/Paramaribo -3:40:40 - LMT 1911 1777 -3:40:52 - PMT 1935 # Paramaribo Mean Time 1778 -3:40:36 - PMT 1945 Oct # The capital moved? 1779 -3:30 - %z 1984 Oct 1780 -3:00 - %z 1781 1782 # Uruguay 1783 # From Paul Eggert (1993-11-18): 1784 # Uruguay wins the prize for the strangest peacetime manipulation of the rules. 1785 # 1786 # From Tim Parenti (2018-02-20), per Jeremie Bonjour (2018-01-31) and Michael 1787 # Deckers (2018-02-20): 1788 # ... At least they kept good records... 1789 # 1790 # http://www.armada.mil.uy/ContenidosPDFs/sohma/web/almanaque/almanaque_2018.pdf#page=36 1791 # Page 36 of Almanaque 2018, published by the Oceanography, Hydrography, and 1792 # Meteorology Service of the Uruguayan Navy, seems to give many transitions 1793 # with greater clarity than we've had before. It directly references many laws 1794 # and decrees which are, in turn, referenced below. They can be viewed in the 1795 # public archives of the Diario Oficial (in Spanish) at 1796 # http://www.impo.com.uy/diariooficial/ 1797 # 1798 # Ley No. 3920 of 1908-06-10 placed the determination of legal time under the 1799 # auspices of the National Institute for the Prediction of Time. It is unclear 1800 # exactly what offset was used during this period, though Ley No. 7200 of 1801 # 1920-04-23 used the Observatory of the National Meteorological Institute in 1802 # Montevideo (34 54' 33" S, 56 12' 45" W) as its reference meridian, 1803 # retarding legal time by 15 minutes 9 seconds from 1920-04-30 24:00, 1804 # resulting in UT-04. Assume the corresponding LMT of UT-03:44:51 (given on 1805 # page 725 of the Proceedings of the Second Pan-American Scientific Congress, 1806 # 1915-1916) was in use, and merely became official from 1908-06-10. 1807 # https://www.impo.com.uy/diariooficial/1908/06/18/12 1808 # https://www.impo.com.uy/diariooficial/1920/04/27/9 1809 # 1810 # Ley No. 7594 of 1923-06-28 specified legal time as Observatory time advanced 1811 # by 44 minutes 51 seconds (UT-03) "from 30 September to 31 March", and by 14 1812 # minutes 51 seconds (UT-03:30) "the rest of the year"; a message from the 1813 # National Council of Administration the same day, published directly below the 1814 # law in the Diario Oficial, specified the first transition to be 1923-09-30 1815 # 24:00. This effectively established standard time at UT-03:30 with 30 1816 # minutes DST. Assume transitions at 24:00 on the specified days until Ley No. 1817 # 7919 of 1926-03-05 ended this arrangement, repealing all "laws and other 1818 # provisions which oppose" it, resulting in year-round UT-03:30; a Resolucin 1819 # of 1926-03-11 puts the final transition at 1926-03-31 24:00, the same as it 1820 # would have been under the previous law. 1821 # https://www.impo.com.uy/diariooficial/1923/07/02/2 1822 # https://www.impo.com.uy/diariooficial/1926/03/10/2 1823 # https://www.impo.com.uy/diariooficial/1926/03/18/2 1824 # 1825 # Rule NAME FROM TO - IN ON AT SAVE LETTER/S 1826 Rule Uruguay 1923 1925 - Oct 1 0:00 0:30 - 1827 Rule Uruguay 1924 1926 - Apr 1 0:00 0 - 1828 # From Tim Parenti (2018-02-15): 1829 # http://www.impo.com.uy/diariooficial/1933/10/27/6 1830 # 1831 # It appears Ley No. 9122 of 1933 was never published as such in the Diario 1832 # Oficial, but instead appeared as Document 26 in the Diario on Friday 1833 # 1933-10-27 as a decree made Monday 1933-10-23 and filed under the Ministry of 1834 # National Defense. It reinstituted a DST of 30 minutes (to UT-03) "from the 1835 # last Sunday of October...until the last Saturday of March." In accordance 1836 # with this provision, the first transition was explicitly specified in Article 1837 # 2 of the decree as Saturday 1933-10-28 at 24:00; that is, Sunday 1933-10-29 1838 # at 00:00. Assume transitions at 00:00 Sunday throughout. 1839 # 1840 # Departing from the matter-of-fact nature of previous timekeeping laws, the 1841 # 1933 decree "consider[s] the advantages of...the advance of legal time": 1842 # 1843 # "Whereas: The measure adopted by almost all nations at the time of the last 1844 # World War still persists in North America and Europe, precisely because of 1845 # the economic, hygienic, and social advantages derived from such an 1846 # emergency measure... 1847 # 1848 # Whereas: The advance of the legal time during the summer seasons, by 1849 # displacing social activity near sunrise, favors the citizen populations 1850 # and especially the society that creates and works..." 1851 # 1852 # It further specified that "necessary measures" be taken to ensure that 1853 # "public spectacles finish, in general, before [01:00]." 1854 Rule Uruguay 1933 1938 - Oct lastSun 0:00 0:30 - 1855 Rule Uruguay 1934 1941 - Mar lastSat 24:00 0 - 1856 # From Tim Parenti (2018-02-15): 1857 # Most of the Rules below, and their contemporaneous Zone lines, have been 1858 # updated simply to match the Almanaque 2018. Although the document does not 1859 # list exact transition times, midnight transitions were already present in our 1860 # data here for all transitions through 2004-09, and this is both consistent 1861 # with prior transitions and verified in several decrees marked below between 1862 # 1939-09 and 2004-09, wherein the relevant text was typically of the form: 1863 # 1864 # "From 0 hours on [date], the legal time of the entire Republic will be... 1865 # 1866 # In accordance with [the preceding], on [previous date] at 24 hours, all 1867 # clocks throughout the Republic will be [advanced/retarded] by..." 1868 # 1869 # It is possible that there is greater specificity to be found for the Rules 1870 # below, but it is buried in no fewer than 40 different decrees individually 1871 # referenced by the Almanaque for the period from 1939-09 to 2014-09. 1872 # Four-fifths of these were promulgated less than two weeks before taking 1873 # effect; more than half within a week and none more than 5 weeks. Only the 1874 # handful with comments below have been checked with any thoroughness. 1875 Rule Uruguay 1939 only - Oct 1 0:00 0:30 - 1876 Rule Uruguay 1940 only - Oct 27 0:00 0:30 - 1877 # From Tim Parenti (2018-02-15): 1878 # Decreto 1145 of the Ministry of National Defense, dated 1941-07-26, specified 1879 # UT-03 from Friday 1941-08-01 00:00, citing an "urgent...need to save fuel". 1880 # http://www.impo.com.uy/diariooficial/1941/08/04/1 1881 Rule Uruguay 1941 only - Aug 1 0:00 0:30 - 1882 # From Tim Parenti (2018-02-15): 1883 # Decreto 1866 of the Ministry of National Defense, dated 1942-12-09, specified 1884 # further advancement (to UT-02:30) from Sunday 1942-12-13 24:00. Since clocks 1885 # never went back to UT-03:30 thereafter, this is modeled as advancing standard 1886 # time by 30 minutes to UT-03, while retaining 30 minutes of DST. 1887 # http://www.impo.com.uy/diariooficial/1942/12/16/3 1888 Rule Uruguay 1942 only - Dec 14 0:00 0:30 - 1889 Rule Uruguay 1943 only - Mar 14 0:00 0 - 1890 Rule Uruguay 1959 only - May 24 0:00 0:30 - 1891 Rule Uruguay 1959 only - Nov 15 0:00 0 - 1892 Rule Uruguay 1960 only - Jan 17 0:00 1:00 - 1893 Rule Uruguay 1960 only - Mar 6 0:00 0 - 1894 Rule Uruguay 1965 only - Apr 4 0:00 1:00 - 1895 Rule Uruguay 1965 only - Sep 26 0:00 0 - 1896 # From Tim Parenti (2018-02-15): 1897 # Decreto 321/968 of 1968-05-25, citing emergency drought measures decreed the 1898 # day before, brought clocks forward 30 minutes from Monday 1968-05-27 00:00. 1899 # http://www.impo.com.uy/diariooficial/1968/05/30/5 1900 Rule Uruguay 1968 only - May 27 0:00 0:30 - 1901 Rule Uruguay 1968 only - Dec 1 0:00 0 - 1902 # From Tim Parenti (2018-02-15): 1903 # Decreto 188/970 of 1970-04-23 instituted restrictions on electricity 1904 # consumption "as a consequence of the current rainfall regime in the country". 1905 # Articles 13 and 14 advanced clocks by an hour from Saturday 1970-04-25 00:00. 1906 # http://www.impo.com.uy/diariooficial/1970/04/29/4 1907 Rule Uruguay 1970 only - Apr 25 0:00 1:00 - 1908 Rule Uruguay 1970 only - Jun 14 0:00 0 - 1909 Rule Uruguay 1972 only - Apr 23 0:00 1:00 - 1910 Rule Uruguay 1972 only - Jul 16 0:00 0 - 1911 # From Tim Parenti (2018-02-15): 1912 # Decreto 29/974 of 1974-01-11, citing "the international rise in the price of 1913 # oil", advanced clocks by 90 minutes (to UT-01:30). Decreto 163/974 of 1914 # 1974-03-04 returned 60 of those minutes (to UT-02:30), and the remaining 30 1915 # minutes followed in Decreto 679/974 of 1974-08-29. 1916 # http://www.impo.com.uy/diariooficial/1974/01/22/11 1917 # http://www.impo.com.uy/diariooficial/1974/03/14/3 1918 # http://www.impo.com.uy/diariooficial/1974/09/04/6 1919 Rule Uruguay 1974 only - Jan 13 0:00 1:30 - 1920 Rule Uruguay 1974 only - Mar 10 0:00 0:30 - 1921 Rule Uruguay 1974 only - Sep 1 0:00 0 - 1922 Rule Uruguay 1974 only - Dec 22 0:00 1:00 - 1923 Rule Uruguay 1975 only - Mar 30 0:00 0 - 1924 Rule Uruguay 1976 only - Dec 19 0:00 1:00 - 1925 Rule Uruguay 1977 only - Mar 6 0:00 0 - 1926 Rule Uruguay 1977 only - Dec 4 0:00 1:00 - 1927 Rule Uruguay 1978 1979 - Mar Sun>=1 0:00 0 - 1928 Rule Uruguay 1978 only - Dec 17 0:00 1:00 - 1929 Rule Uruguay 1979 only - Apr 29 0:00 1:00 - 1930 Rule Uruguay 1980 only - Mar 16 0:00 0 - 1931 # From Tim Parenti (2018-02-15): 1932 # Decreto 725/987 of 1987-12-04 cited "better use of national tourist 1933 # attractions" to advance clocks one hour from Monday 1987-12-14 00:00. 1934 # http://www.impo.com.uy/diariooficial/1988/01/25/1 1935 Rule Uruguay 1987 only - Dec 14 0:00 1:00 - 1936 Rule Uruguay 1988 only - Feb 28 0:00 0 - 1937 Rule Uruguay 1988 only - Dec 11 0:00 1:00 - 1938 Rule Uruguay 1989 only - Mar 5 0:00 0 - 1939 Rule Uruguay 1989 only - Oct 29 0:00 1:00 - 1940 Rule Uruguay 1990 only - Feb 25 0:00 0 - 1941 # From Tim Parenti (2018-02-15), per Paul Eggert (1999-11-04): 1942 # IATA agrees as below for 1990-10 through 1993-02. Per Almanaque 2018, the 1943 # 1992/1993 season appears to be the first in over half a century where DST 1944 # both began and ended pursuant to the same decree. 1945 Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 - 1946 Rule Uruguay 1991 1992 - Mar Sun>=1 0:00 0 - 1947 Rule Uruguay 1992 only - Oct 18 0:00 1:00 - 1948 Rule Uruguay 1993 only - Feb 28 0:00 0 - 1949 # From Eduardo Cota (2004-09-20): 1950 # The Uruguayan government has decreed a change in the local time.... 1951 # From Tim Parenti (2018-02-15): 1952 # Decreto 328/004 of 2004-09-15. 1953 # http://www.impo.com.uy/diariooficial/2004/09/23/documentos.pdf#page=1 1954 Rule Uruguay 2004 only - Sep 19 0:00 1:00 - 1955 # From Steffen Thorsen (2005-03-11): 1956 # Uruguay's DST was scheduled to end on Sunday, 2005-03-13, but in order to 1957 # save energy ... it was postponed two weeks.... 1958 # From Tim Parenti (2018-02-15): 1959 # This 2005 postponement is not in Almanaque 2018. Go with the contemporaneous 1960 # reporting, which is confirmed by Decreto 107/005 of 2005-03-10 amending 1961 # Decreto 328/004: 1962 # http://www.impo.com.uy/diariooficial/2005/03/15/documentos.pdf#page=1 1963 # The original decree specified a transition of 2005-03-12 24:00, but the new 1964 # one specified 2005-03-27 02:00. 1965 Rule Uruguay 2005 only - Mar 27 2:00 0 - 1966 # From Eduardo Cota (2005-09-27): 1967 # ...from 2005-10-09 at 02:00 local time, until 2006-03-12 at 02:00 local time, 1968 # official time in Uruguay will be at GMT -2. 1969 # From Tim Parenti (2018-02-15): 1970 # Decreto 318/005 of 2005-09-19. 1971 # http://www.impo.com.uy/diariooficial/2005/09/23/documentos.pdf#page=1 1972 Rule Uruguay 2005 only - Oct 9 2:00 1:00 - 1973 Rule Uruguay 2006 2015 - Mar Sun>=8 2:00 0 - 1974 # From Tim Parenti (2018-02-15), per Jesper Nrgaard Welen (2006-09-06): 1975 # Decreto 311/006 of 2006-09-04 established regular DST from the first Sunday 1976 # of October at 02:00 through the second Sunday of March at 02:00. Almanaque 1977 # 2018 appears to have a few typoed dates through this period; ignore them. 1978 # http://www.impo.com.uy/diariooficial/2006/09/08/documentos.pdf#page=1 1979 Rule Uruguay 2006 2014 - Oct Sun>=1 2:00 1:00 - 1980 # From Steffen Thorsen (2015-06-30): 1981 # ... it looks like they will not be using DST the coming summer: 1982 # http://www.elobservador.com.uy/gobierno-resolvio-que-no-habra-cambio-horario-verano-n656787 1983 # http://www.republica.com.uy/este-ano-no-se-modificara-el-huso-horario-en-uruguay/523760/ 1984 # From Paul Eggert (2015-06-30): 1985 # Apparently restaurateurs complained that DST caused people to go to the beach 1986 # instead of out to dinner. 1987 # From Pablo Camargo (2015-07-13): 1988 # http://archivo.presidencia.gub.uy/sci/decretos/2015/06/cons_min_201.pdf 1989 # From Tim Parenti (2018-02-15): 1990 # Decreto 178/015 of 2015-06-29; repeals Decreto 311/006. 1991 1992 # This Zone can be simplified once we assume zic %z. 1993 Zone America/Montevideo -3:44:51 - LMT 1908 Jun 10 1994 -3:44:51 - MMT 1920 May 1 # Montevideo MT 1995 -4:00 - %z 1923 Oct 1 1996 -3:30 Uruguay %z 1942 Dec 14 1997 -3:00 Uruguay %z 1960 1998 -3:00 Uruguay %z 1968 1999 -3:00 Uruguay %z 1970 2000 -3:00 Uruguay %z 1974 2001 -3:00 Uruguay %z 1974 Mar 10 2002 -3:00 Uruguay %z 1974 Dec 22 2003 -3:00 Uruguay %z 2004 2005 # Venezuela 2006 # 2007 # From Paul Eggert (2015-07-28): 2008 # For the 1965 transition see Gaceta Oficial No. 27.619 (1964-12-15), p 205.533 2009 # http://www.pgr.gob.ve/dmdocuments/1964/27619.pdf 2010 # 2011 # From John Stainforth (2007-11-28): 2012 # ... the change for Venezuela originally expected for 2007-12-31 has 2013 # been brought forward to 2007-12-09. The official announcement was 2014 # published today in the "Gaceta Oficial de la Repblica Bolivariana 2015 # de Venezuela, nmero 38.819" (official document for all laws or 2016 # resolution publication) 2017 # http://www.globovision.com/news.php?nid=72208 2018 2019 # From Alexander Krivenyshev (2016-04-15): 2020 # https://actualidad.rt.com/actualidad/204758-venezuela-modificar-huso-horario-sequia-elnino 2021 # 2022 # From Paul Eggert (2016-04-15): 2023 # Clocks advance 30 minutes on 2016-05-01 at 02:30.... 2024 # "'Venezuela's new time-zone: hours without light, hours without water, 2025 # hours of presidential broadcasts, hours of lines,' quipped comedian 2026 # Jean Mary Curr ...". See: Cawthorne A, Kai D. Venezuela scraps 2027 # half-hour time difference set by Chavez. Reuters 2016-04-15 14:50 -0400 2028 # https://www.reuters.com/article/us-venezuela-timezone-idUSKCN0XC2BE 2029 # 2030 # From Matt Johnson (2016-04-20): 2031 # ... published in the official Gazette [2016-04-18], here: 2032 # http://historico.tsj.gob.ve/gaceta_ext/abril/1842016/E-1842016-4551.pdf 2033 2034 # Zone NAME STDOFF RULES FORMAT [UNTIL] 2035 Zone America/Caracas -4:27:44 - LMT 1890 2036 -4:27:40 - CMT 1912 Feb 12 # Caracas Mean Time? 2037 -4:30 - %z 1965 Jan 1 0:00 2038 -4:00 - %z 2007 Dec 9 3:00 2039 -4:30 - %z 2016 May 1 2:30 2040 -4:00 - %z 2041
Indexes created Thu May 07 00:24:58 UTC 2026