southamerica revision 175034
1# @(#)southamerica 8.15 2# <pre> 3 4# This data is by no means authoritative; if you think you know better, 5# go ahead and edit the file (and please send any changes to 6# tz@elsie.nci.nih.gov for general use in the future). 7 8# From Paul Eggert (2006-03-22): 9# A good source for time zone historical data outside the U.S. is 10# Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition), 11# San Diego: ACS Publications, Inc. (2003). 12# 13# Gwillim Law writes that a good source 14# for recent time zone data is the International Air Transport 15# Association's Standard Schedules Information Manual (IATA SSIM), 16# published semiannually. Law sent in several helpful summaries 17# of the IATA's data after 1990. 18# 19# Except where otherwise noted, Shanks & Pottenger is the source for 20# entries through 1990, and IATA SSIM is the source for entries afterwards. 21# 22# Earlier editions of these tables used the North American style (e.g. ARST and 23# ARDT for Argentine Standard and Daylight Time), but the following quote 24# suggests that it's better to use European style (e.g. ART and ARST). 25# I suggest the use of _Summer time_ instead of the more cumbersome 26# _daylight-saving time_. _Summer time_ seems to be in general use 27# in Europe and South America. 28# -- E O Cutler, _New York Times_ (1937-02-14), quoted in 29# H L Mencken, _The American Language: Supplement I_ (1960), p 466 30# 31# Earlier editions of these tables also used the North American style 32# for time zones in Brazil, but this was incorrect, as Brazilians say 33# "summer time". Reinaldo Goulart, a Sao Paulo businessman active in 34# the railroad sector, writes (1999-07-06): 35# The subject of time zones is currently a matter of discussion/debate in 36# Brazil. Let's say that "the Brasilia time" is considered the 37# "official time" because Brasilia is the capital city. 38# The other three time zones are called "Brasilia time "minus one" or 39# "plus one" or "plus two". As far as I know there is no such 40# name/designation as "Eastern Time" or "Central Time". 41# So I invented the following (English-language) abbreviations for now. 42# Corrections are welcome! 43# std dst 44# -2:00 FNT FNST Fernando de Noronha 45# -3:00 BRT BRST Brasilia 46# -4:00 AMT AMST Amazon 47# -5:00 ACT ACST Acre 48 49############################################################################### 50 51############################################################################### 52 53# Argentina 54 55# From Bob Devine (1988-01-28): 56# Argentina: first Sunday in October to first Sunday in April since 1976. 57# Double Summer time from 1969 to 1974. Switches at midnight. 58 59# From U. S. Naval Observatory (1988-01-199): 60# ARGENTINA 3 H BEHIND UTC 61 62# From Hernan G. Otero (1995-06-26): 63# I am sending modifications to the Argentine time zone table... 64# AR was chosen because they are the ISO letters that represent Argentina. 65 66# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 67Rule Arg 1930 only - Dec 1 0:00 1:00 S 68Rule Arg 1931 only - Apr 1 0:00 0 - 69Rule Arg 1931 only - Oct 15 0:00 1:00 S 70Rule Arg 1932 1940 - Mar 1 0:00 0 - 71Rule Arg 1932 1939 - Nov 1 0:00 1:00 S 72Rule Arg 1940 only - Jul 1 0:00 1:00 S 73Rule Arg 1941 only - Jun 15 0:00 0 - 74Rule Arg 1941 only - Oct 15 0:00 1:00 S 75Rule Arg 1943 only - Aug 1 0:00 0 - 76Rule Arg 1943 only - Oct 15 0:00 1:00 S 77Rule Arg 1946 only - Mar 1 0:00 0 - 78Rule Arg 1946 only - Oct 1 0:00 1:00 S 79Rule Arg 1963 only - Oct 1 0:00 0 - 80Rule Arg 1963 only - Dec 15 0:00 1:00 S 81Rule Arg 1964 1966 - Mar 1 0:00 0 - 82Rule Arg 1964 1966 - Oct 15 0:00 1:00 S 83Rule Arg 1967 only - Apr 2 0:00 0 - 84Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 S 85Rule Arg 1968 1969 - Apr Sun>=1 0:00 0 - 86Rule Arg 1974 only - Jan 23 0:00 1:00 S 87Rule Arg 1974 only - May 1 0:00 0 - 88Rule Arg 1988 only - Dec 1 0:00 1:00 S 89# 90# From Hernan G. Otero (1995-06-26): 91# These corrections were contributed by InterSoft Argentina S.A., 92# obtaining the data from the: 93# Talleres de Hidrografia Naval Argentina 94# (Argentine Naval Hydrography Institute) 95Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 - 96Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 S 97# 98# From Hernan G. Otero (1995-06-26): 99# From this moment on, the law that mandated the daylight saving 100# time corrections was derogated and no more modifications 101# to the time zones (for daylight saving) are now made. 102# 103# From Rives McDow (2000-01-10): 104# On October 3, 1999, 0:00 local, Argentina implemented daylight savings time, 105# which did not result in the switch of a time zone, as they stayed 9 hours 106# from the International Date Line. 107Rule Arg 1999 only - Oct Sun>=1 0:00 1:00 S 108# From Paul Eggert (2007-12-28): 109# DST was set to expire on March 5, not March 3, but since it was converted 110# to standard time on March 3 it's more convenient for us to pretend that 111# it ended on March 3. 112Rule Arg 2000 only - Mar 3 0:00 0 - 113# 114# From Peter Gradelski via Steffen Thorsen (2000-03-01): 115# We just checked with our Sao Paulo office and they say the government of 116# Argentina decided not to become one of the countries that go on or off DST. 117# So Buenos Aires should be -3 hours from GMT at all times. 118# 119# From Fabian L. Arce Jofre (2000-04-04): 120# The law that claimed DST for Argentina was derogated by President Fernando 121# de la Rua on March 2, 2000, because it would make people spend more energy 122# in the winter time, rather than less. The change took effect on March 3. 123# 124# From Mariano Absatz (2001-06-06): 125# one of the major newspapers here in Argentina said that the 1999 126# Timezone Law (which never was effectively applied) will (would?) be 127# in effect.... The article is at 128# http://ar.clarin.com/diario/2001-06-06/e-01701.htm 129# ... The Law itself is "Ley No 25155", sanctioned on 1999-08-25, enacted 130# 1999-09-17, and published 1999-09-21. The official publication is at: 131# http://www.boletin.jus.gov.ar/BON/Primera/1999/09-Septiembre/21/PDF/BO21-09-99LEG.PDF 132# Regretfully, you have to subscribe (and pay) for the on-line version.... 133# 134# (2001-06-12): 135# the timezone for Argentina will not change next Sunday. 136# Apparently it will do so on Sunday 24th.... 137# http://ar.clarin.com/diario/2001-06-12/s-03501.htm 138# 139# (2001-06-25): 140# Last Friday (yes, the last working day before the date of the change), the 141# Senate annulled the 1999 law that introduced the changes later postponed. 142# http://www.clarin.com.ar/diario/2001-06-22/s-03601.htm 143# It remains the vote of the Deputies..., but it will be the same.... 144# This kind of things had always been done this way in Argentina. 145# We are still -03:00 all year round in all of the country. 146# 147# From Steffen Thorsen (2007-12-21): 148# A user (Leonardo Chaim) reported that Argentina will adopt DST.... 149# all of the country (all Zone-entries) are affected. News reports like 150# http://www.lanacion.com.ar/opinion/nota.asp?nota_id=973037 indicate 151# that Argentina will use DST next year as well, from October to 152# March, although exact rules are not given. 153# 154# From Jesper Norgaard Welen (2007-12-26) 155# The last hurdle of Argentina DST is over, the proposal was approved in 156# the lower chamber too (Deputados) with a vote 192 for and 2 against. 157# By the way thanks to Mariano Absatz and Daniel Mario Vega for the link to 158# the original scanned proposal, where the dates and the zero hours are 159# clear and unambiguous...This is the article about final approval: 160# <a href="http://www.lanacion.com.ar/politica/nota.asp?nota_id=973996"> 161# http://www.lanacion.com.ar/politica/nota.asp?nota_id=973996 162# </a> 163# 164# From Paul Eggert (2007-12-22): 165# For dates after mid-2008, the following rules are my guesses and 166# are quite possibly wrong, but are more likely than no DST at all. 167Rule Arg 2007 only - Dec 30 0:00 1:00 S 168Rule Arg 2008 max - Mar Sun>=15 0:00 0 - 169Rule Arg 2008 max - Oct Sun>=1 0:00 1:00 S 170 171# From Mariano Absatz (2004-05-21): 172# Today it was officially published that the Province of Mendoza is changing 173# its timezone this winter... starting tomorrow night.... 174# http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040521-27158-normas.pdf 175# From Paul Eggert (2004-05-24): 176# It's Law No. 7,210. This change is due to a public power emergency, so for 177# now we'll assume it's for this year only. 178# 179# From Paul Eggert (2006-03-22): 180# <a href="http://www.spicasc.net/horvera.html"> 181# Hora de verano para la Republica Argentina (2003-06-08) 182# </a> says that standard time in Argentina from 1894-10-31 183# to 1920-05-01 was -4:16:48.25. Go with this more-precise value 184# over Shanks & Pottenger. 185# 186# From Mariano Absatz (2004-06-05): 187# These media articles from a major newspaper mostly cover the current state: 188# http://www.lanacion.com.ar/04/05/27/de_604825.asp 189# http://www.lanacion.com.ar/04/05/28/de_605203.asp 190# 191# The following eight (8) provinces pulled clocks back to UTC-04:00 at 192# midnight Monday May 31st. (that is, the night between 05/31 and 06/01). 193# Apparently, all nine provinces would go back to UTC-03:00 at the same 194# time in October 17th. 195# 196# Catamarca, Chubut, La Rioja, San Juan, San Luis, Santa Cruz, 197# Tierra del Fuego, Tucuman. 198# 199# From Mariano Absatz (2004-06-14): 200# ... this weekend, the Province of Tucuman decided it'd go back to UTC-03:00 201# yesterday midnight (that is, at 24:00 Saturday 12th), since the people's 202# annoyance with the change is much higher than the power savings obtained.... 203# 204# From Gwillim Law (2004-06-14): 205# http://www.lanacion.com.ar/04/06/10/de_609078.asp ... 206# "The time change in Tierra del Fuego was a conflicted decision from 207# the start. The government had decreed that the measure would take 208# effect on June 1, but a normative error forced the new time to begin 209# three days earlier, from a Saturday to a Sunday.... 210# Our understanding was that the change was originally scheduled to take place 211# on June 1 at 00:00 in Chubut, Santa Cruz, Tierra del Fuego (and some other 212# provinces). Sunday was May 30, only two days earlier. So the article 213# contains a contradiction. I would give more credence to the Saturday/Sunday 214# date than the "three days earlier" phrase, and conclude that Tierra del 215# Fuego set its clocks back at 2004-05-30 00:00. 216# 217# From Steffen Thorsen (2004-10-05): 218# The previous law 7210 which changed the province of Mendoza's time zone 219# back in May have been modified slightly in a new law 7277, which set the 220# new end date to 2004-09-26 (original date was 2004-10-17). 221# http://www.gobernac.mendoza.gov.ar/boletin/pdf/20040924-27244-normas.pdf 222# 223# From Mariano Absatz (2004-10-05): 224# San Juan changed from UTC-03:00 to UTC-04:00 at midnight between 225# Sunday, May 30th and Monday, May 31st. It changed back to UTC-03:00 226# at midnight between Saturday, July 24th and Sunday, July 25th.... 227# http://www.sanjuan.gov.ar/prensa/archivo/000329.html 228# http://www.sanjuan.gov.ar/prensa/archivo/000426.html 229# http://www.sanjuan.gov.ar/prensa/archivo/000441.html 230 231# Unless otherwise specified, data are from Shanks & Pottenger through 1992, 232# from the IATA otherwise. As noted below, Shanks & Pottenger say that 233# America/Cordoba split into 6 subregions during 1991/1992, but we 234# haven't verified this yet so for now we'll keep it a single region. 235# 236# Zone NAME GMTOFF RULES FORMAT [UNTIL] 237# 238# Buenos Aires (BA), Capital Federal (CF), 239Zone America/Argentina/Buenos_Aires -3:53:48 - LMT 1894 Oct 31 240 -4:16:48 - CMT 1920 May # Cordoba Mean Time 241 -4:00 - ART 1930 Dec 242 -4:00 Arg AR%sT 1969 Oct 5 243 -3:00 Arg AR%sT 1999 Oct 3 244 -4:00 Arg AR%sT 2000 Mar 3 245 -3:00 Arg AR%sT 246# 247# Santa Fe (SF), Entre Rios (ER), Corrientes (CN), Misiones (MN), Chaco (CC), 248# Formosa (FM), Salta (SA), Santiago del Estero (SE), Cordoba (CB), 249# San Luis (SL), La Pampa (LP), Neuquen (NQ), Rio Negro (RN) 250# 251# Shanks & Pottenger also make the following claims, which we haven't verified: 252# - Formosa switched to -3:00 on 1991-01-07. 253# - Misiones switched to -3:00 on 1990-12-29. 254# - Chaco switched to -3:00 on 1991-01-04. 255# - San Luis switched to -4:00 on 1990-03-14, then to -3:00 on 1990-10-15, 256# then to -4:00 on 1991-03-01, then to -3:00 on 1991-06-01. 257# - Santiago del Estero switched to -4:00 on 1991-04-01, 258# then to -3:00 on 1991-04-26. 259# 260Zone America/Argentina/Cordoba -4:16:48 - LMT 1894 Oct 31 261 -4:16:48 - CMT 1920 May 262 -4:00 - ART 1930 Dec 263 -4:00 Arg AR%sT 1969 Oct 5 264 -3:00 Arg AR%sT 1991 Mar 3 265 -4:00 - WART 1991 Oct 20 266 -3:00 Arg AR%sT 1999 Oct 3 267 -4:00 Arg AR%sT 2000 Mar 3 268 -3:00 Arg AR%sT 269# 270# Tucuman (TM) 271Zone America/Argentina/Tucuman -4:20:52 - LMT 1894 Oct 31 272 -4:16:48 - CMT 1920 May 273 -4:00 - ART 1930 Dec 274 -4:00 Arg AR%sT 1969 Oct 5 275 -3:00 Arg AR%sT 1991 Mar 3 276 -4:00 - WART 1991 Oct 20 277 -3:00 Arg AR%sT 1999 Oct 3 278 -4:00 Arg AR%sT 2000 Mar 3 279 -3:00 - ART 2004 Jun 1 280 -4:00 - WART 2004 Jun 13 281 -3:00 Arg AR%sT 282# 283# La Rioja (LR) 284Zone America/Argentina/La_Rioja -4:27:24 - LMT 1894 Oct 31 285 -4:16:48 - CMT 1920 May 286 -4:00 - ART 1930 Dec 287 -4:00 Arg AR%sT 1969 Oct 5 288 -3:00 Arg AR%sT 1991 Mar 1 289 -4:00 - WART 1991 May 7 290 -3:00 Arg AR%sT 1999 Oct 3 291 -4:00 Arg AR%sT 2000 Mar 3 292 -3:00 - ART 2004 Jun 1 293 -4:00 - WART 2004 Jun 20 294 -3:00 Arg AR%sT 295# 296# San Juan (SJ) 297Zone America/Argentina/San_Juan -4:34:04 - LMT 1894 Oct 31 298 -4:16:48 - CMT 1920 May 299 -4:00 - ART 1930 Dec 300 -4:00 Arg AR%sT 1969 Oct 5 301 -3:00 Arg AR%sT 1991 Mar 1 302 -4:00 - WART 1991 May 7 303 -3:00 Arg AR%sT 1999 Oct 3 304 -4:00 Arg AR%sT 2000 Mar 3 305 -3:00 - ART 2004 May 31 306 -4:00 - WART 2004 Jul 25 307 -3:00 Arg AR%sT 308# 309# Jujuy (JY) 310Zone America/Argentina/Jujuy -4:21:12 - LMT 1894 Oct 31 311 -4:16:48 - CMT 1920 May 312 -4:00 - ART 1930 Dec 313 -4:00 Arg AR%sT 1969 Oct 5 314 -3:00 Arg AR%sT 1990 Mar 4 315 -4:00 - WART 1990 Oct 28 316 -4:00 1:00 WARST 1991 Mar 17 317 -4:00 - WART 1991 Oct 6 318 -3:00 1:00 ARST 1992 319 -3:00 Arg AR%sT 1999 Oct 3 320 -4:00 Arg AR%sT 2000 Mar 3 321 -3:00 Arg AR%sT 322# 323# Catamarca (CT), Chubut (CH) 324Zone America/Argentina/Catamarca -4:23:08 - LMT 1894 Oct 31 325 -4:16:48 - CMT 1920 May 326 -4:00 - ART 1930 Dec 327 -4:00 Arg AR%sT 1969 Oct 5 328 -3:00 Arg AR%sT 1991 Mar 3 329 -4:00 - WART 1991 Oct 20 330 -3:00 Arg AR%sT 1999 Oct 3 331 -4:00 Arg AR%sT 2000 Mar 3 332 -3:00 - ART 2004 Jun 1 333 -4:00 - WART 2004 Jun 20 334 -3:00 Arg AR%sT 335# 336# Mendoza (MZ) 337Zone America/Argentina/Mendoza -4:35:16 - LMT 1894 Oct 31 338 -4:16:48 - CMT 1920 May 339 -4:00 - ART 1930 Dec 340 -4:00 Arg AR%sT 1969 Oct 5 341 -3:00 Arg AR%sT 1990 Mar 4 342 -4:00 - WART 1990 Oct 15 343 -4:00 1:00 WARST 1991 Mar 1 344 -4:00 - WART 1991 Oct 15 345 -4:00 1:00 WARST 1992 Mar 1 346 -4:00 - WART 1992 Oct 18 347 -3:00 Arg AR%sT 1999 Oct 3 348 -4:00 Arg AR%sT 2000 Mar 3 349 -3:00 - ART 2004 May 23 350 -4:00 - WART 2004 Sep 26 351 -3:00 Arg AR%sT 352# 353# Santa Cruz (SC) 354Zone America/Argentina/Rio_Gallegos -4:36:52 - LMT 1894 Oct 31 355 -4:16:48 - CMT 1920 May # Cordoba Mean Time 356 -4:00 - ART 1930 Dec 357 -4:00 Arg AR%sT 1969 Oct 5 358 -3:00 Arg AR%sT 1999 Oct 3 359 -4:00 Arg AR%sT 2000 Mar 3 360 -3:00 - ART 2004 Jun 1 361 -4:00 - WART 2004 Jun 20 362 -3:00 Arg AR%sT 363# 364# Tierra del Fuego, Antartida e Islas del Atlantico Sur (TF) 365Zone America/Argentina/Ushuaia -4:33:12 - LMT 1894 Oct 31 366 -4:16:48 - CMT 1920 May # Cordoba Mean Time 367 -4:00 - ART 1930 Dec 368 -4:00 Arg AR%sT 1969 Oct 5 369 -3:00 Arg AR%sT 1999 Oct 3 370 -4:00 Arg AR%sT 2000 Mar 3 371 -3:00 - ART 2004 May 30 372 -4:00 - WART 2004 Jun 20 373 -3:00 Arg AR%sT 374 375# Aruba 376# Zone NAME GMTOFF RULES FORMAT [UNTIL] 377Zone America/Aruba -4:40:24 - LMT 1912 Feb 12 # Oranjestad 378 -4:30 - ANT 1965 # Netherlands Antilles Time 379 -4:00 - AST 380 381# Bolivia 382# Zone NAME GMTOFF RULES FORMAT [UNTIL] 383Zone America/La_Paz -4:32:36 - LMT 1890 384 -4:32:36 - CMT 1931 Oct 15 # Calamarca MT 385 -4:32:36 1:00 BOST 1932 Mar 21 # Bolivia ST 386 -4:00 - BOT # Bolivia Time 387 388# Brazil 389 390# From Paul Eggert (1993-11-18): 391# The mayor of Rio recently attempted to change the time zone rules 392# just in his city, in order to leave more summer time for the tourist trade. 393# The rule change lasted only part of the day; 394# the federal government refused to follow the city's rules, and business 395# was in a chaos, so the mayor backed down that afternoon. 396 397# From IATA SSIM (1996-02): 398# _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS), 399# Santa Catarina (SC), Parana (PR), Sao Paulo (SP), Rio de Janeiro (RJ), 400# Espirito Santo (ES), Minas Gerais (MG), Bahia (BA), Goias (GO), 401# Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL]. 402# [The last three states are new to this issue of the IATA SSIM.] 403 404# From Gwillim Law (1996-10-07): 405# Geography, history (Tocantins was part of Goias until 1989), and other 406# sources of time zone information lead me to believe that AL, SE, and TO were 407# always in BR1, and so the only change was whether or not they observed DST.... 408# The earliest issue of the SSIM I have is 2/91. Each issue from then until 409# 9/95 says that DST is observed only in the ten states I quoted from 9/95, 410# along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2 411# (UTC-4).... The other two time zones given for Brazil are BR3, which is 412# UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is 413# UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's 414# become part of the state of Pernambuco). The boundary between BR1 and BR2 415# has never been clearly stated. They've simply been called East and West. 416# However, some conclusions can be drawn from another IATA manual: the Airline 417# Coding Directory, which lists close to 400 airports in Brazil. For each 418# airport it gives a time zone which is coded to the SSIM. From that 419# information, I'm led to conclude that the states of Amapa (AP), Ceara (CE), 420# Maranhao (MA), Paraiba (PR), Pernambuco (PE), Piaui (PI), and Rio Grande do 421# Norte (RN), and the eastern part of Para (PA) are all in BR1 without DST. 422 423# From Marcos Tadeu (1998-09-27): 424# <a href="http://pcdsh01.on.br/verao1.html"> 425# Brazilian official page 426# </a> 427 428# From Jesper Norgaard (2000-11-03): 429# [For an official list of which regions in Brazil use which time zones, see:] 430# http://pcdsh01.on.br/Fusbr.htm 431# http://pcdsh01.on.br/Fusbrhv.htm 432 433# From Celso Doria via David Madeo (2002-10-09): 434# The reason for the delay this year has to do with elections in Brazil. 435# 436# Unlike in the United States, elections in Brazil are 100% computerized and 437# the results are known almost immediately. Yesterday, it was the first 438# round of the elections when 115 million Brazilians voted for President, 439# Governor, Senators, Federal Deputies, and State Deputies. Nobody is 440# counting (or re-counting) votes anymore and we know there will be a second 441# round for the Presidency and also for some Governors. The 2nd round will 442# take place on October 27th. 443# 444# The reason why the DST will only begin November 3rd is that the thousands 445# of electoral machines used cannot have their time changed, and since the 446# Constitution says the elections must begin at 8:00 AM and end at 5:00 PM, 447# the Government decided to postpone DST, instead of changing the Constitution 448# (maybe, for the next elections, it will be possible to change the clock)... 449 450# From Rodrigo Severo (2004-10-04): 451# It's just the biannual change made necessary by the much hyped, supposedly 452# modern Brazilian eletronic voting machines which, apparently, can't deal 453# with a time change between the first and the second rounds of the elections. 454 455# From Steffen Thorsen (2007-09-20): 456# Brazil will start DST on 2007-10-14 00:00 and end on 2008-02-17 00:00: 457# http://www.mme.gov.br/site/news/detail.do;jsessionid=BBA06811AFCAAC28F0285210913513DA?newsId=13975 458 459# From Paul Eggert (2002-10-10): 460# The official decrees referenced below are mostly taken from 461# <a href="http://pcdsh01.on.br/DecHV.html"> 462# Decretos sobre o Horario de Verao no Brasil 463# </a>. 464 465# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 466# Decree <a href="http://pcdsh01.on.br/HV20466.htm">20,466</a> (1931-10-01) 467# Decree <a href="http://pcdsh01.on.br/HV21896.htm">21,896</a> (1932-01-10) 468Rule Brazil 1931 only - Oct 3 11:00 1:00 S 469Rule Brazil 1932 1933 - Apr 1 0:00 0 - 470Rule Brazil 1932 only - Oct 3 0:00 1:00 S 471# Decree <a href="http://pcdsh01.on.br/HV23195.htm">23,195</a> (1933-10-10) 472# revoked DST. 473# Decree <a href="http://pcdsh01.on.br/HV27496.htm">27,496</a> (1949-11-24) 474# Decree <a href="http://pcdsh01.on.br/HV27998.htm">27,998</a> (1950-04-13) 475Rule Brazil 1949 1952 - Dec 1 0:00 1:00 S 476Rule Brazil 1950 only - Apr 16 1:00 0 - 477Rule Brazil 1951 1952 - Apr 1 0:00 0 - 478# Decree <a href="http://pcdsh01.on.br/HV32308.htm">32,308</a> (1953-02-24) 479Rule Brazil 1953 only - Mar 1 0:00 0 - 480# Decree <a href="http://pcdsh01.on.br/HV34724.htm">34,724</a> (1953-11-30) 481# revoked DST. 482# Decree <a href="http://pcdsh01.on.br/HV52700.htm">52,700</a> (1963-10-18) 483# established DST from 1963-10-23 00:00 to 1964-02-29 00:00 484# in SP, RJ, GB, MG, ES, due to the prolongation of the drought. 485# Decree <a href="http://pcdsh01.on.br/HV53071.htm">53,071</a> (1963-12-03) 486# extended the above decree to all of the national territory on 12-09. 487Rule Brazil 1963 only - Dec 9 0:00 1:00 S 488# Decree <a href="http://pcdsh01.on.br/HV53604.htm">53,604</a> (1964-02-25) 489# extended summer time by one day to 1964-03-01 00:00 (start of school). 490Rule Brazil 1964 only - Mar 1 0:00 0 - 491# Decree <a href="http://pcdsh01.on.br/HV55639.htm">55,639</a> (1965-01-27) 492Rule Brazil 1965 only - Jan 31 0:00 1:00 S 493Rule Brazil 1965 only - Mar 31 0:00 0 - 494# Decree <a href="http://pcdsh01.on.br/HV57303.htm">57,303</a> (1965-11-22) 495Rule Brazil 1965 only - Dec 1 0:00 1:00 S 496# Decree <a href="http://pcdsh01.on.br/HV57843.htm">57,843</a> (1966-02-18) 497Rule Brazil 1966 1968 - Mar 1 0:00 0 - 498Rule Brazil 1966 1967 - Nov 1 0:00 1:00 S 499# Decree <a href="http://pcdsh01.on.br/HV63429.htm">63,429</a> (1968-10-15) 500# revoked DST. 501# Decree <a href="http://pcdsh01.on.br/HV91698.htm">91,698</a> (1985-09-27) 502Rule Brazil 1985 only - Nov 2 0:00 1:00 S 503# Decree 92,310 (1986-01-21) 504# Decree 92,463 (1986-03-13) 505Rule Brazil 1986 only - Mar 15 0:00 0 - 506# Decree 93,316 (1986-10-01) 507Rule Brazil 1986 only - Oct 25 0:00 1:00 S 508Rule Brazil 1987 only - Feb 14 0:00 0 - 509# Decree <a href="http://pcdsh01.on.br/HV94922.htm">94,922</a> (1987-09-22) 510Rule Brazil 1987 only - Oct 25 0:00 1:00 S 511Rule Brazil 1988 only - Feb 7 0:00 0 - 512# Decree <a href="http://pcdsh01.on.br/HV96676.htm">96,676</a> (1988-09-12) 513# except for the states of AC, AM, PA, RR, RO, and AP (then a territory) 514Rule Brazil 1988 only - Oct 16 0:00 1:00 S 515Rule Brazil 1989 only - Jan 29 0:00 0 - 516# Decree <a href="http://pcdsh01.on.br/HV98077.htm">98,077</a> (1989-08-21) 517# with the same exceptions 518Rule Brazil 1989 only - Oct 15 0:00 1:00 S 519Rule Brazil 1990 only - Feb 11 0:00 0 - 520# Decree <a href="http://pcdsh01.on.br/HV99530.htm">99,530</a> (1990-09-17) 521# adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF. 522# Decree 99,629 (1990-10-19) adds BA, MT. 523Rule Brazil 1990 only - Oct 21 0:00 1:00 S 524Rule Brazil 1991 only - Feb 17 0:00 0 - 525# <a href="http://pcdsh01.on.br/HV1991.htm">Unnumbered decree</a> (1991-09-25) 526# adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF. 527Rule Brazil 1991 only - Oct 20 0:00 1:00 S 528Rule Brazil 1992 only - Feb 9 0:00 0 - 529# <a href="http://pcdsh01.on.br/HV1992.htm">Unnumbered decree</a> (1992-10-16) 530# adopted by same states. 531Rule Brazil 1992 only - Oct 25 0:00 1:00 S 532Rule Brazil 1993 only - Jan 31 0:00 0 - 533# Decree <a href="http://pcdsh01.on.br/HV942.htm">942</a> (1993-09-28) 534# adopted by same states, plus AM. 535# Decree <a href="http://pcdsh01.on.br/HV1252.htm">1,252</a> (1994-09-22; 536# web page corrected 2004-01-07) adopted by same states, minus AM. 537# Decree <a href="http://pcdsh01.on.br/HV1636.htm">1,636</a> (1995-09-14) 538# adopted by same states, plus MT and TO. 539# Decree <a href="http://pcdsh01.on.br/HV1674.htm">1,674</a> (1995-10-13) 540# adds AL, SE. 541Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 S 542Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 - 543Rule Brazil 1996 only - Feb 11 0:00 0 - 544# Decree <a href="http://pcdsh01.on.br/HV2000.htm">2,000</a> (1996-09-04) 545# adopted by same states, minus AL, SE. 546Rule Brazil 1996 only - Oct 6 0:00 1:00 S 547Rule Brazil 1997 only - Feb 16 0:00 0 - 548# From Daniel C. Sobral (1998-02-12): 549# In 1997, the DS began on October 6. The stated reason was that 550# because international television networks ignored Brazil's policy on DS, 551# they bought the wrong times on satellite for coverage of Pope's visit. 552# This year, the ending date of DS was postponed to March 1 553# to help dealing with the shortages of electric power. 554# 555# Decree 2,317 (1997-09-04), adopted by same states. 556Rule Brazil 1997 only - Oct 6 0:00 1:00 S 557# Decree <a href="http://pcdsh01.on.br/figuras/HV2495.JPG">2,495</a> 558# (1998-02-10) 559Rule Brazil 1998 only - Mar 1 0:00 0 - 560# Decree <a href="http://pcdsh01.on.br/figuras/Hv98.jpg">2,780</a> (1998-09-11) 561# adopted by the same states as before. 562Rule Brazil 1998 only - Oct 11 0:00 1:00 S 563Rule Brazil 1999 only - Feb 21 0:00 0 - 564# Decree <a href="http://pcdsh01.on.br/figuras/HV3150.gif">3,150</a> 565# (1999-08-23) adopted by same states. 566# Decree <a href="http://pcdsh01.on.br/DecHV99.gif">3,188</a> (1999-09-30) 567# adds SE, AL, PB, PE, RN, CE, PI, MA and RR. 568Rule Brazil 1999 only - Oct 3 0:00 1:00 S 569Rule Brazil 2000 only - Feb 27 0:00 0 - 570# Decree <a href="http://pcdsh01.on.br/DEC3592.htm">3,592</a> (2000-09-06) 571# adopted by the same states as before. 572# Decree <a href="http://pcdsh01.on.br/Dec3630.jpg">3,630</a> (2000-10-13) 573# repeals DST in PE and RR, effective 2000-10-15 00:00. 574# Decree <a href="http://pcdsh01.on.br/Dec3632.jpg">3,632</a> (2000-10-17) 575# repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00. 576# Decree <a href="http://pcdsh01.on.br/figuras/HV3916.gif">3,916</a> 577# (2001-09-13) reestablishes DST in AL, CE, MA, PB, PE, PI, RN, SE. 578Rule Brazil 2000 2001 - Oct Sun>=8 0:00 1:00 S 579Rule Brazil 2001 2006 - Feb Sun>=15 0:00 0 - 580# Decree 4,399 (2002-10-01) repeals DST in AL, CE, MA, PB, PE, PI, RN, SE. 581# <a href="http://www.presidencia.gov.br/CCIVIL/decreto/2002/D4399.htm"></a> 582Rule Brazil 2002 only - Nov 3 0:00 1:00 S 583# Decree 4,844 (2003-09-24; corrected 2003-09-26) repeals DST in BA, MT, TO. 584# <a href="http://www.presidencia.gov.br/CCIVIL/decreto/2003/D4844.htm"></a> 585Rule Brazil 2003 only - Oct 19 0:00 1:00 S 586# Decree 5,223 (2004-10-01) reestablishes DST in MT. 587# <a href="http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2004/Decreto/D5223.htm"></a> 588Rule Brazil 2004 only - Nov 2 0:00 1:00 S 589# Decree <a href="http://pcdsh01.on.br/DecHV5539.gif">5,539</a> (2005-09-19), 590# adopted by the same states as before. 591Rule Brazil 2005 only - Oct 16 0:00 1:00 S 592# Decree <a href="http://pcdsh01.on.br/DecHV5920.gif">5,920</a> (2006-10-03), 593# adopted by the same states as before. 594Rule Brazil 2006 only - Nov 5 0:00 1:00 S 595Rule Brazil 2007 only - Feb 25 0:00 0 - 596# (Decree number not yet known) 597# http://www.brasil.gov.br/noticias/ultimas_noticias/horario_verao070920/ 598# (2007-09-20) after a heads-up from Steffen Thorsen: 599Rule Brazil 2007 max - Oct Sun>=8 0:00 1:00 S 600Rule Brazil 2008 max - Feb Sun>=15 0:00 0 - 601# The latest ruleset listed above says that the following states observe DST: 602# DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP. 603# For dates after mid-2008, the above rules with TO="max" are guesses 604# and are quite possibly wrong, but are more likely than no DST at all. 605 606 607# Zone NAME GMTOFF RULES FORMAT [UNTIL] 608# 609# Fernando de Noronha (administratively part of PE) 610Zone America/Noronha -2:09:40 - LMT 1914 611 -2:00 Brazil FN%sT 1990 Sep 17 612 -2:00 - FNT 1999 Sep 30 613 -2:00 Brazil FN%sT 2000 Oct 15 614 -2:00 - FNT 2001 Sep 13 615 -2:00 Brazil FN%sT 2002 Oct 1 616 -2:00 - FNT 617# Other Atlantic islands have no permanent settlement. 618# These include Trindade and Martin Vaz (administratively part of ES), 619# Atol das Rocas (RN), and Penedos de Sao Pedro e Sao Paulo (PE). 620# Fernando de Noronha was a separate territory from 1942-09-02 to 1989-01-01; 621# it also included the Penedos. 622# 623# Amapa (AP), east Para (PA) 624# East Para includes Belem, Maraba, Serra Norte, and Sao Felix do Xingu. 625# The division between east and west Para is the river Xingu. 626# In the north a very small part from the river Javary (now Jari I guess, 627# the border with Amapa) to the Amazon, then to the Xingu. 628Zone America/Belem -3:13:56 - LMT 1914 629 -3:00 Brazil BR%sT 1988 Sep 12 630 -3:00 - BRT 631# 632# Maranhao (MA), Piaui (PI), Ceara (CE), Rio Grande do Norte (RN), 633# Paraiba (PB) 634Zone America/Fortaleza -2:34:00 - LMT 1914 635 -3:00 Brazil BR%sT 1990 Sep 17 636 -3:00 - BRT 1999 Sep 30 637 -3:00 Brazil BR%sT 2000 Oct 22 638 -3:00 - BRT 2001 Sep 13 639 -3:00 Brazil BR%sT 2002 Oct 1 640 -3:00 - BRT 641# 642# Pernambuco (PE) (except Atlantic islands) 643Zone America/Recife -2:19:36 - LMT 1914 644 -3:00 Brazil BR%sT 1990 Sep 17 645 -3:00 - BRT 1999 Sep 30 646 -3:00 Brazil BR%sT 2000 Oct 15 647 -3:00 - BRT 2001 Sep 13 648 -3:00 Brazil BR%sT 2002 Oct 1 649 -3:00 - BRT 650# 651# Tocantins (TO) 652Zone America/Araguaina -3:12:48 - LMT 1914 653 -3:00 Brazil BR%sT 1990 Sep 17 654 -3:00 - BRT 1995 Sep 14 655 -3:00 Brazil BR%sT 2003 Sep 24 656 -3:00 - BRT 657# 658# Alagoas (AL), Sergipe (SE) 659Zone America/Maceio -2:22:52 - LMT 1914 660 -3:00 Brazil BR%sT 1990 Sep 17 661 -3:00 - BRT 1995 Oct 13 662 -3:00 Brazil BR%sT 1996 Sep 4 663 -3:00 - BRT 1999 Sep 30 664 -3:00 Brazil BR%sT 2000 Oct 22 665 -3:00 - BRT 2001 Sep 13 666 -3:00 Brazil BR%sT 2002 Oct 1 667 -3:00 - BRT 668# 669# Bahia (BA) 670# There are too many Salvadors elsewhere, so use America/Bahia instead 671# of America/Salvador. 672Zone America/Bahia -2:34:04 - LMT 1914 673 -3:00 Brazil BR%sT 2003 Sep 24 674 -3:00 - BRT 675# 676# Goias (GO), Distrito Federal (DF), Minas Gerais (MG), 677# Espirito Santo (ES), Rio de Janeiro (RJ), Sao Paulo (SP), Parana (PR), 678# Santa Catarina (SC), Rio Grande do Sul (RS) 679Zone America/Sao_Paulo -3:06:28 - LMT 1914 680 -3:00 Brazil BR%sT 1963 Oct 23 00:00 681 -3:00 1:00 BRST 1964 682 -3:00 Brazil BR%sT 683# 684# Mato Grosso do Sul (MS) 685Zone America/Campo_Grande -3:38:28 - LMT 1914 686 -4:00 Brazil AM%sT 687# 688# Mato Grosso (MT) 689Zone America/Cuiaba -3:44:20 - LMT 1914 690 -4:00 Brazil AM%sT 2003 Sep 24 691 -4:00 - AMT 2004 Oct 1 692 -4:00 Brazil AM%sT 693# 694# west Para (PA), Rondonia (RO) 695# West Para includes Altamira, Oribidos, Prainha, Oriximina, and Santarem. 696Zone America/Porto_Velho -4:15:36 - LMT 1914 697 -4:00 Brazil AM%sT 1988 Sep 12 698 -4:00 - AMT 699# 700# Roraima (RR) 701Zone America/Boa_Vista -4:02:40 - LMT 1914 702 -4:00 Brazil AM%sT 1988 Sep 12 703 -4:00 - AMT 1999 Sep 30 704 -4:00 Brazil AM%sT 2000 Oct 15 705 -4:00 - AMT 706# 707# east Amazonas (AM): Boca do Acre, Jutai, Manaus, Floriano Peixoto 708# The great circle line from Tabatinga to Porto Acre divides 709# east from west Amazonas. 710Zone America/Manaus -4:00:04 - LMT 1914 711 -4:00 Brazil AM%sT 1988 Sep 12 712 -4:00 - AMT 1993 Sep 28 713 -4:00 Brazil AM%sT 1994 Sep 22 714 -4:00 - AMT 715# 716# west Amazonas (AM): Atalaia do Norte, Boca do Maoco, Benjamin Constant, 717# Eirunepe, Envira, Ipixuna 718Zone America/Eirunepe -4:39:28 - LMT 1914 719 -5:00 Brazil AC%sT 1988 Sep 12 720 -5:00 - ACT 1993 Sep 28 721 -5:00 Brazil AC%sT 1994 Sep 22 722 -5:00 - ACT 723# 724# Acre (AC) 725Zone America/Rio_Branco -4:31:12 - LMT 1914 726 -5:00 Brazil AC%sT 1988 Sep 12 727 -5:00 - ACT 728 729 730# Chile 731 732# From Eduardo Krell (1995-10-19): 733# The law says to switch to DST at midnight [24:00] on the second SATURDAY 734# of October.... The law is the same for March and October. 735# (1998-09-29): 736# Because of the drought this year, the government decided to go into 737# DST earlier (saturday 9/26 at 24:00). This is a one-time change only ... 738# (unless there's another dry season next year, I guess). 739 740# From Julio I. Pacheco Troncoso (1999-03-18): 741# Because of the same drought, the government decided to end DST later, 742# on April 3, (one-time change). 743 744# From Oscar van Vlijmen (2006-10-08): 745# http://www.horaoficial.cl/cambio.htm 746 747# From Jesper Norgaard Welen (2006-10-08): 748# I think that there are some obvious mistakes in the suggested link 749# from Oscar van Vlijmen,... for instance entry 66 says that GMT-4 750# ended 1990-09-12 while entry 67 only begins GMT-3 at 1990-09-15 751# (they should have been 1990-09-15 and 1990-09-16 respectively), but 752# anyhow it clears up some doubts too. 753 754# From Paul Eggert (2006-12-27): 755# The following data for Chile and America/Santiago are from 756# <http://www.horaoficial.cl/horaof.htm> (2006-09-20), transcribed by 757# Jesper Norgaard Welen. The data for Pacific/Easter are from Shanks 758# & Pottenger, except with DST transitions after 1932 cloned from 759# America/Santiago. The pre-1980 Pacific/Easter data are dubious, 760# but we have no other source. 761 762# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 763Rule Chile 1927 1932 - Sep 1 0:00 1:00 S 764Rule Chile 1928 1932 - Apr 1 0:00 0 - 765Rule Chile 1942 only - Jun 1 4:00u 0 - 766Rule Chile 1942 only - Aug 1 5:00u 1:00 S 767Rule Chile 1946 only - Jul 15 4:00u 1:00 S 768Rule Chile 1946 only - Sep 1 3:00u 0:00 - 769Rule Chile 1947 only - Apr 1 4:00u 0 - 770Rule Chile 1968 only - Nov 3 4:00u 1:00 S 771Rule Chile 1969 only - Mar 30 3:00u 0 - 772Rule Chile 1969 only - Nov 23 4:00u 1:00 S 773Rule Chile 1970 only - Mar 29 3:00u 0 - 774Rule Chile 1971 only - Mar 14 3:00u 0 - 775Rule Chile 1970 1972 - Oct Sun>=9 4:00u 1:00 S 776Rule Chile 1972 1986 - Mar Sun>=9 3:00u 0 - 777Rule Chile 1973 only - Sep 30 4:00u 1:00 S 778Rule Chile 1974 1987 - Oct Sun>=9 4:00u 1:00 S 779Rule Chile 1987 only - Apr 12 3:00u 0 - 780Rule Chile 1988 1989 - Mar Sun>=9 3:00u 0 - 781Rule Chile 1988 only - Oct Sun>=1 4:00u 1:00 S 782Rule Chile 1989 only - Oct Sun>=9 4:00u 1:00 S 783Rule Chile 1990 only - Mar 18 3:00u 0 - 784Rule Chile 1990 only - Sep 16 4:00u 1:00 S 785Rule Chile 1991 1996 - Mar Sun>=9 3:00u 0 - 786Rule Chile 1991 1997 - Oct Sun>=9 4:00u 1:00 S 787Rule Chile 1997 only - Mar 30 3:00u 0 - 788Rule Chile 1998 only - Mar Sun>=9 3:00u 0 - 789Rule Chile 1998 only - Sep 27 4:00u 1:00 S 790Rule Chile 1999 only - Apr 4 3:00u 0 - 791Rule Chile 1999 max - Oct Sun>=9 4:00u 1:00 S 792Rule Chile 2000 max - Mar Sun>=9 3:00u 0 - 793# IATA SSIM anomalies: (1992-02) says 1992-03-14; 794# (1996-09) says 1998-03-08. Ignore these. 795# Zone NAME GMTOFF RULES FORMAT [UNTIL] 796Zone America/Santiago -4:42:46 - LMT 1890 797 -4:42:46 - SMT 1910 # Santiago Mean Time 798 -5:00 - CLT 1916 Jul 1 # Chile Time 799 -4:42:46 - SMT 1918 Sep 1 # Santiago Mean Time 800 -4:00 - CLT 1919 Jul 1 # Chile Time 801 -4:42:46 - SMT 1927 Sep 1 # Santiago Mean Time 802 -5:00 Chile CL%sT 1947 May 22 # Chile Time 803 -4:00 Chile CL%sT 804Zone Pacific/Easter -7:17:44 - LMT 1890 805 -7:17:28 - EMT 1932 Sep # Easter Mean Time 806 -7:00 Chile EAS%sT 1982 Mar 13 21:00 # Easter I Time 807 -6:00 Chile EAS%sT 808# 809# Sala y Gomez Island is like Pacific/Easter. 810# Other Chilean locations, including Juan Fernandez Is, San Ambrosio, 811# San Felix, and Antarctic bases, are like America/Santiago. 812 813# Colombia 814# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 815Rule CO 1992 only - May 3 0:00 1:00 S 816Rule CO 1993 only - Apr 4 0:00 0 - 817# Zone NAME GMTOFF RULES FORMAT [UNTIL] 818Zone America/Bogota -4:56:20 - LMT 1884 Mar 13 819 -4:56:20 - BMT 1914 Nov 23 # Bogota Mean Time 820 -5:00 CO CO%sT # Colombia Time 821# Malpelo, Providencia, San Andres 822# no information; probably like America/Bogota 823 824# Curacao 825# 826# From Paul Eggert (2006-03-22): 827# Shanks & Pottenger say that The Bottom and Philipsburg have been at 828# -4:00 since standard time was introduced on 1912-03-02; and that 829# Kralendijk and Rincon used Kralendijk Mean Time (-4:33:08) from 830# 1912-02-02 to 1965-01-01. The former is dubious, since S&P also say 831# Saba Island has been like Curacao. 832# This all predates our 1970 cutoff, though. 833# 834# By July 2007 Curacao and St Maarten are planned to become 835# associated states within the Netherlands, much like Aruba; 836# Bonaire, Saba and St Eustatius would become directly part of the 837# Netherlands as Kingdom Islands. This won't affect their time zones 838# though, as far as we know. 839# 840# Zone NAME GMTOFF RULES FORMAT [UNTIL] 841Zone America/Curacao -4:35:44 - LMT 1912 Feb 12 # Willemstad 842 -4:30 - ANT 1965 # Netherlands Antilles Time 843 -4:00 - AST 844 845# Ecuador 846# 847# From Paul Eggert (2007-03-04): 848# Apparently Ecuador had a failed experiment with DST in 1992. 849# <http://midena.gov.ec/content/view/1261/208/> (2007-02-27) and 850# <http://www.hoy.com.ec/NoticiaNue.asp?row_id=249856> (2006-11-06) both 851# talk about "hora Sixto". Leave this alone for now, as we have no data. 852# 853# Zone NAME GMTOFF RULES FORMAT [UNTIL] 854Zone America/Guayaquil -5:19:20 - LMT 1890 855 -5:14:00 - QMT 1931 # Quito Mean Time 856 -5:00 - ECT # Ecuador Time 857Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno 858 -5:00 - ECT 1986 859 -6:00 - GALT # Galapagos Time 860 861# Falklands 862 863# From Paul Eggert (2006-03-22): 864# Between 1990 and 2000 inclusive, Shanks & Pottenger and the IATA agree except 865# the IATA gives 1996-09-08. Go with Shanks & Pottenger. 866 867# From Falkland Islands Government Office, London (2001-01-22) 868# via Jesper Norgaard: 869# ... the clocks revert back to Local Mean Time at 2 am on Sunday 15 870# April 2001 and advance one hour to summer time at 2 am on Sunday 2 871# September. It is anticipated that the clocks will revert back at 2 872# am on Sunday 21 April 2002 and advance to summer time at 2 am on 873# Sunday 1 September. 874 875# From Rives McDow (2001-02-13): 876# 877# I have communicated several times with people there, and the last 878# time I had communications that was helpful was in 1998. Here is 879# what was said then: 880# 881# "The general rule was that Stanley used daylight saving and the Camp 882# did not. However for various reasons many people in the Camp have 883# started to use daylight saving (known locally as 'Stanley Time') 884# There is no rule as to who uses daylight saving - it is a matter of 885# personal choice and so it is impossible to draw a map showing who 886# uses it and who does not. Any list would be out of date as soon as 887# it was produced. This year daylight saving ended on April 18/19th 888# and started again on September 12/13th. I do not know what the rule 889# is, but can find out if you like. We do not change at the same time 890# as UK or Chile." 891# 892# I did have in my notes that the rule was "Second Saturday in Sep at 893# 0:00 until third Saturday in Apr at 0:00". I think that this does 894# not agree in some cases with Shanks; is this true? 895# 896# Also, there is no mention in the list that some areas in the 897# Falklands do not use DST. I have found in my communications there 898# that these areas are on the western half of East Falkland and all of 899# West Falkland. Stanley is the only place that consistently observes 900# DST. Again, as in other places in the world, the farmers don't like 901# it. West Falkland is almost entirely sheep farmers. 902# 903# I know one lady there that keeps a list of which farm keeps DST and 904# which doesn't each year. She runs a shop in Stanley, and says that 905# the list changes each year. She uses it to communicate to her 906# customers, catching them when they are home for lunch or dinner. 907 908# From Paul Eggert (2001-03-05): 909# For now, we'll just record the time in Stanley, since we have no 910# better info. 911 912# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 913Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 S 914Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 - 915Rule Falk 1939 only - Oct 1 0:00 1:00 S 916Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 S 917Rule Falk 1943 only - Jan 1 0:00 0 - 918Rule Falk 1983 only - Sep lastSun 0:00 1:00 S 919Rule Falk 1984 1985 - Apr lastSun 0:00 0 - 920Rule Falk 1984 only - Sep 16 0:00 1:00 S 921Rule Falk 1985 2000 - Sep Sun>=9 0:00 1:00 S 922Rule Falk 1986 2000 - Apr Sun>=16 0:00 0 - 923Rule Falk 2001 max - Apr Sun>=15 2:00 0 - 924Rule Falk 2001 max - Sep Sun>=1 2:00 1:00 S 925# Zone NAME GMTOFF RULES FORMAT [UNTIL] 926Zone Atlantic/Stanley -3:51:24 - LMT 1890 927 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time 928 -4:00 Falk FK%sT 1983 May # Falkland Is Time 929 -3:00 Falk FK%sT 1985 Sep 15 930 -4:00 Falk FK%sT 931 932# French Guiana 933# Zone NAME GMTOFF RULES FORMAT [UNTIL] 934Zone America/Cayenne -3:29:20 - LMT 1911 Jul 935 -4:00 - GFT 1967 Oct # French Guiana Time 936 -3:00 - GFT 937 938# Guyana 939# Zone NAME GMTOFF RULES FORMAT [UNTIL] 940Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown 941 -3:45 - GBGT 1966 May 26 # Br Guiana Time 942 -3:45 - GYT 1975 Jul 31 # Guyana Time 943 -3:00 - GYT 1991 944# IATA SSIM (1996-06) says -4:00. Assume a 1991 switch. 945 -4:00 - GYT 946 947# Paraguay 948# From Paul Eggert (2006-03-22): 949# Shanks & Pottenger say that spring transitions are from 01:00 -> 02:00, 950# and autumn transitions are from 00:00 -> 23:00. Go with pre-1999 951# editions of Shanks, and with the IATA, who say transitions occur at 00:00. 952# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 953Rule Para 1975 1988 - Oct 1 0:00 1:00 S 954Rule Para 1975 1978 - Mar 1 0:00 0 - 955Rule Para 1979 1991 - Apr 1 0:00 0 - 956Rule Para 1989 only - Oct 22 0:00 1:00 S 957Rule Para 1990 only - Oct 1 0:00 1:00 S 958Rule Para 1991 only - Oct 6 0:00 1:00 S 959Rule Para 1992 only - Mar 1 0:00 0 - 960Rule Para 1992 only - Oct 5 0:00 1:00 S 961Rule Para 1993 only - Mar 31 0:00 0 - 962Rule Para 1993 1995 - Oct 1 0:00 1:00 S 963Rule Para 1994 1995 - Feb lastSun 0:00 0 - 964Rule Para 1996 only - Mar 1 0:00 0 - 965# IATA SSIM (2000-02) says 1999-10-10; ignore this for now. 966# From Steffen Thorsen (2000-10-02): 967# I have three independent reports that Paraguay changed to DST this Sunday 968# (10-01). 969# 970# Translated by Gwillim Law (2001-02-27) from 971# <a href="http://www.diarionoticias.com.py/011000/nacional/naciona1.htm"> 972# Noticias, a daily paper in Asuncion, Paraguay (2000-10-01) 973# </a>: 974# Starting at 0:00 today, the clock will be set forward 60 minutes, in 975# fulfillment of Decree No. 7,273 of the Executive Power.... The time change 976# system has been operating for several years. Formerly there was a separate 977# decree each year; the new law has the same effect, but permanently. Every 978# year, the time will change on the first Sunday of October; likewise, the 979# clock will be set back on the first Sunday of March. 980# 981Rule Para 1996 2001 - Oct Sun>=1 0:00 1:00 S 982# IATA SSIM (1997-09) says Mar 1; go with Shanks & Pottenger. 983Rule Para 1997 only - Feb lastSun 0:00 0 - 984# Shanks & Pottenger say 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but 985# (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27). 986Rule Para 1998 2001 - Mar Sun>=1 0:00 0 - 987# From Rives McDow (2002-02-28): 988# A decree was issued in Paraguay (no. 16350) on 2002-02-26 that changed the 989# dst method to be from the first Sunday in September to the first Sunday in 990# April. 991Rule Para 2002 2004 - Apr Sun>=1 0:00 0 - 992Rule Para 2002 2003 - Sep Sun>=1 0:00 1:00 S 993# 994# From Jesper Norgaard Welen (2005-01-02): 995# There are several sources that claim that Paraguay made 996# a timezone rule change in autumn 2004. 997# From Steffen Thorsen (2005-01-05): 998# Decree 1,867 (2004-03-05) 999# From Carlos Raul Perasso via Jesper Norgaard Welen (2006-10-13) 1000# <http://www.presidencia.gov.py/decretos/D1867.pdf> 1001Rule Para 2004 max - Oct Sun>=15 0:00 1:00 S 1002Rule Para 2005 max - Mar Sun>=8 0:00 0 - 1003 1004# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1005Zone America/Asuncion -3:50:40 - LMT 1890 1006 -3:50:40 - AMT 1931 Oct 10 # Asuncion Mean Time 1007 -4:00 - PYT 1972 Oct # Paraguay Time 1008 -3:00 - PYT 1974 Apr 1009 -4:00 Para PY%sT 1010 1011# Peru 1012# 1013# <a href="news:xrGmb.39935$gA1.13896113@news4.srv.hcvlny.cv.net"> 1014# From Evelyn C. Leeper via Mark Brader (2003-10-26):</a> 1015# When we were in Peru in 1985-1986, they apparently switched over 1016# sometime between December 29 and January 3 while we were on the Amazon. 1017# 1018# From Paul Eggert (2006-03-22): 1019# Shanks & Pottenger don't have this transition. Assume 1986 was like 1987. 1020 1021# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1022Rule Peru 1938 only - Jan 1 0:00 1:00 S 1023Rule Peru 1938 only - Apr 1 0:00 0 - 1024Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 S 1025Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 - 1026Rule Peru 1986 1987 - Jan 1 0:00 1:00 S 1027Rule Peru 1986 1987 - Apr 1 0:00 0 - 1028Rule Peru 1990 only - Jan 1 0:00 1:00 S 1029Rule Peru 1990 only - Apr 1 0:00 0 - 1030# IATA is ambiguous for 1993/1995; go with Shanks & Pottenger. 1031Rule Peru 1994 only - Jan 1 0:00 1:00 S 1032Rule Peru 1994 only - Apr 1 0:00 0 - 1033# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1034Zone America/Lima -5:08:12 - LMT 1890 1035 -5:08:36 - LMT 1908 Jul 28 # Lima Mean Time? 1036 -5:00 Peru PE%sT # Peru Time 1037 1038# South Georgia 1039# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1040Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken 1041 -2:00 - GST # South Georgia Time 1042 1043# South Sandwich Is 1044# uninhabited; scientific personnel have wintered 1045 1046# Suriname 1047# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1048Zone America/Paramaribo -3:40:40 - LMT 1911 1049 -3:40:52 - PMT 1935 # Paramaribo Mean Time 1050 -3:40:36 - PMT 1945 Oct # The capital moved? 1051 -3:30 - NEGT 1975 Nov 20 # Dutch Guiana Time 1052 -3:30 - SRT 1984 Oct # Suriname Time 1053 -3:00 - SRT 1054 1055# Trinidad and Tobago 1056# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1057Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2 1058 -4:00 - AST 1059 1060# Uruguay 1061# From Paul Eggert (1993-11-18): 1062# Uruguay wins the prize for the strangest peacetime manipulation of the rules. 1063# From Shanks & Pottenger: 1064# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 1065# Whitman gives 1923 Oct 1; go with Shanks & Pottenger. 1066Rule Uruguay 1923 only - Oct 2 0:00 0:30 HS 1067Rule Uruguay 1924 1926 - Apr 1 0:00 0 - 1068Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS 1069Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS 1070# Shanks & Pottenger give 1935 Apr 1 0:00 & 1936 Mar 30 0:00; go with Whitman. 1071Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 - 1072Rule Uruguay 1936 only - Nov 1 0:00 0:30 HS 1073Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 - 1074# Whitman gives 1937 Oct 3; go with Shanks & Pottenger. 1075Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HS 1076# Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13, 1077# and 1943 Apr 13 ``to present time''; go with Shanks & Pottenger. 1078Rule Uruguay 1941 only - Aug 1 0:00 0:30 HS 1079Rule Uruguay 1942 only - Jan 1 0:00 0 - 1080Rule Uruguay 1942 only - Dec 14 0:00 1:00 S 1081Rule Uruguay 1943 only - Mar 14 0:00 0 - 1082Rule Uruguay 1959 only - May 24 0:00 1:00 S 1083Rule Uruguay 1959 only - Nov 15 0:00 0 - 1084Rule Uruguay 1960 only - Jan 17 0:00 1:00 S 1085Rule Uruguay 1960 only - Mar 6 0:00 0 - 1086Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 S 1087Rule Uruguay 1965 only - Sep 26 0:00 0 - 1088Rule Uruguay 1966 1967 - Oct 31 0:00 0 - 1089Rule Uruguay 1968 1970 - May 27 0:00 0:30 HS 1090Rule Uruguay 1968 1970 - Dec 2 0:00 0 - 1091Rule Uruguay 1972 only - Apr 24 0:00 1:00 S 1092Rule Uruguay 1972 only - Aug 15 0:00 0 - 1093Rule Uruguay 1974 only - Mar 10 0:00 0:30 HS 1094Rule Uruguay 1974 only - Dec 22 0:00 1:00 S 1095Rule Uruguay 1976 only - Oct 1 0:00 0 - 1096Rule Uruguay 1977 only - Dec 4 0:00 1:00 S 1097Rule Uruguay 1978 only - Apr 1 0:00 0 - 1098Rule Uruguay 1979 only - Oct 1 0:00 1:00 S 1099Rule Uruguay 1980 only - May 1 0:00 0 - 1100Rule Uruguay 1987 only - Dec 14 0:00 1:00 S 1101Rule Uruguay 1988 only - Mar 14 0:00 0 - 1102Rule Uruguay 1988 only - Dec 11 0:00 1:00 S 1103Rule Uruguay 1989 only - Mar 12 0:00 0 - 1104Rule Uruguay 1989 only - Oct 29 0:00 1:00 S 1105# Shanks & Pottenger say no DST was observed in 1990/1 and 1991/2, 1106# and that 1992/3's DST was from 10-25 to 03-01. Go with IATA. 1107Rule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 - 1108Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S 1109Rule Uruguay 1992 only - Oct 18 0:00 1:00 S 1110Rule Uruguay 1993 only - Feb 28 0:00 0 - 1111# From Eduardo Cota (2004-09-20): 1112# The uruguayan government has decreed a change in the local time.... 1113# http://www.presidencia.gub.uy/decretos/2004091502.htm 1114Rule Uruguay 2004 only - Sep 19 0:00 1:00 S 1115# From Steffen Thorsen (2005-03-11): 1116# Uruguay's DST was scheduled to end on Sunday, 2005-03-13, but in order to 1117# save energy ... it was postponed two weeks.... 1118# http://www.presidencia.gub.uy/_Web/noticias/2005/03/2005031005.htm 1119Rule Uruguay 2005 only - Mar 27 2:00 0 - 1120# From Eduardo Cota (2005-09-27): 1121# http://www.presidencia.gub.uy/_Web/decretos/2005/09/CM%20119_09%2009%202005_00001.PDF 1122# This means that from 2005-10-09 at 02:00 local time, until 2006-03-12 at 1123# 02:00 local time, official time in Uruguay will be at GMT -2. 1124Rule Uruguay 2005 only - Oct 9 2:00 1:00 S 1125Rule Uruguay 2006 only - Mar 12 2:00 0 - 1126# From Jesper Norgaard Welen (2006-09-06): 1127# http://www.presidencia.gub.uy/_web/decretos/2006/09/CM%20210_08%2006%202006_00001.PDF 1128Rule Uruguay 2006 max - Oct Sun>=1 2:00 1:00 S 1129Rule Uruguay 2007 max - Mar Sun>=8 2:00 0 - 1130# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1131Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28 1132 -3:44:44 - MMT 1920 May 1 # Montevideo MT 1133 -3:30 Uruguay UY%sT 1942 Dec 14 # Uruguay Time 1134 -3:00 Uruguay UY%sT 1135 1136# Venezuela 1137# 1138# From John Stainforth (2007-11-28): 1139# ... the change for Venezuela originally expected for 2007-12-31 has 1140# been brought forward to 2007-12-09. The official announcement was 1141# published today in the "Gaceta Oficial de la Republica Bolivariana 1142# de Venezuela, numero 38.819" (official document for all laws or 1143# resolution publication) 1144# http://www.globovision.com/news.php?nid=72208 1145 1146# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1147Zone America/Caracas -4:27:44 - LMT 1890 1148 -4:27:40 - CMT 1912 Feb 12 # Caracas Mean Time? 1149 -4:30 - VET 1965 # Venezuela Time 1150 -4:00 - VET 2007 Dec 9 03:00 1151 -4:30 - VET 1152