1# @(#)southamerica 7.36 2 3# This data is by no means authoritative; if you think you know better, 4# go ahead and edit the file (and please send any changes to 5# tz@elsie.nci.nih.gov for general use in the future). 6 7# From Paul Eggert <eggert@twinsun.com> (1999-07-07): 8# A good source for time zone historical data outside the U.S. is 9# Thomas G. Shanks, The International Atlas (5th edition), 10# San Diego: ACS Publications, Inc. (1999). 11# 12# Gwillim Law <Gwil_Law@bridge-point.com> writes that a good source 13# for recent time zone data is the International Air Transport 14# Association's Standard Schedules Information Manual (IATA SSIM), 15# published semiannually. Law sent in several helpful summaries 16# of the IATA's data after 1990. 17# 18# Except where otherwise noted, Shanks is the source for entries through 1990, 19# and IATA SSIM is the source for entries after 1990. 20# 21# Earlier editions of these tables used the North American style (e.g. ARST and 22# ARDT for Argentine Standard and Daylight Time), but the following quote 23# suggests that it's better to use European style (e.g. ART and ARST). 24# I suggest the use of _Summer time_ instead of the more cumbersome 25# _daylight-saving time_. _Summer time_ seems to be in general use 26# in Europe and South America. 27# -- E O Cutler, _New York Times_ (1937-02-14), quoted in 28# H L Mencken, _The American Language: Supplement I_ (1960), p 466 29# 30# Earlier editions of these tables also used the North American style 31# for time zones in Brazil, but this was incorrect, as Brazilians say 32# "summer time". Reinaldo Goulart, a Sao Paulo businessman active in 33# the railroad sector, writes (1999-07-06): 34# The subject of time zones is currently a matter of discussion/debate in 35# Brazil. Let's say that "the Brasilia time" is considered the 36# "official time" because Brasilia is the capital city. 37# The other three time zones are called "Brasilia time "minus one" or 38# "plus one" or "plus two". As far as I know there is no such 39# name/designation as "Eastern Time" or "Central Time". 40# So I invented the following (English-language) abbreviations for now. 41# Corrections are welcome! 42# std dst 43# -2:00 FNT FNST Fernando de Noronha 44# -3:00 BRT BRST Brasilia 45# -4:00 AMT AMST Amazon 46# -5:00 ACT ACST Acre 47 48############################################################################### 49 50############################################################################### 51 52# Argentina 53 54# From Bob Devine (1988-01-28): 55# Argentina: first Sunday in October to first Sunday in April since 1976. 56# Double Summer time from 1969 to 1974. Switches at midnight. 57 58# From U. S. Naval Observatory (1988-01-199): 59# ARGENTINA 3 H BEHIND UTC 60 61# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26): 62# I am sending modifications to the Argentine time zone table... 63# AR was chosen because they are the ISO letters that represent Argentina. 64 65# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 66Rule Arg 1930 only - Dec 1 0:00 1:00 S 67Rule Arg 1931 only - Apr 1 0:00 0 - 68Rule Arg 1931 only - Oct 15 0:00 1:00 S 69Rule Arg 1932 1940 - Mar 1 0:00 0 - 70Rule Arg 1932 1939 - Nov 1 0:00 1:00 S 71Rule Arg 1940 only - Jul 1 0:00 1:00 S 72Rule Arg 1941 only - Jun 15 0:00 0 - 73Rule Arg 1941 only - Oct 15 0:00 1:00 S 74Rule Arg 1943 only - Aug 1 0:00 0 - 75Rule Arg 1943 only - Oct 15 0:00 1:00 S 76Rule Arg 1946 only - Mar 1 0:00 0 - 77Rule Arg 1946 only - Oct 1 0:00 1:00 S 78Rule Arg 1963 only - Oct 1 0:00 0 - 79Rule Arg 1963 only - Dec 15 0:00 1:00 S 80Rule Arg 1964 1966 - Mar 1 0:00 0 - 81Rule Arg 1964 1966 - Oct 15 0:00 1:00 S 82Rule Arg 1967 only - Apr 1 0:00 0 - 83Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 S 84Rule Arg 1968 1969 - Apr Sun>=1 0:00 0 - 85Rule Arg 1974 only - Jan 23 0:00 1:00 S 86Rule Arg 1974 only - May 1 0:00 0 - 87Rule Arg 1974 1976 - Oct Sun>=1 0:00 1:00 S 88Rule Arg 1975 1977 - Apr Sun>=1 0:00 0 - 89Rule Arg 1985 only - Nov 2 0:00 1:00 S 90Rule Arg 1986 only - Mar 14 0:00 0 - 91Rule Arg 1986 1987 - Oct 25 0:00 1:00 S 92Rule Arg 1987 only - Feb 13 0:00 0 - 93Rule Arg 1988 only - Feb 7 0:00 0 - 94Rule Arg 1988 only - Dec 1 0:00 1:00 S 95# 96# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26): 97# These corrections were contributed by InterSoft Argentina S.A., 98# obtaining the data from the: 99# Talleres de Hidrografia Naval Argentina 100# (Argentine Naval Hydrography Institute) 101# 102# Shanks stops after 1992-03-01; go with Otero. 103Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 - 104Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 S 105# 106# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26): 107# From this moment on, the law that mandated the daylight saving 108# time corrections was derogated and no more modifications 109# to the time zones (for daylight saving) are now made. 110# 111# From Rives McDow (2000-01-10): 112# On October 3, 1999, 0:00 local, Argentina implemented daylight savings time, 113# which did not result in the switch of a time zone, as they stayed 9 hours 114# from the International Date Line. 115Rule Arg 1999 only - Oct Sun>=1 0:00 1:00 S 116Rule Arg 2000 only - Mar Sun>=1 0:00 0 - 117# 118# From Peter Gradelski via Steffen Thorsen (2000-03-01): 119# We just checked with our San Paulo office and they say the government of 120# Argentina decided not to become one of the countries that go on or off DST. 121# So Buenos Aires should be -3 hours from GMT at all times. 122# 123# From Fabian L. Arce Jofre <farcejofre@bigfoot.com> (2000-04-04): 124# The law that claimed DST for Argentina was derogated by President Fernando 125# de la Rua on March 2, 2000, because it would make people spend more energy 126# in the winter time, rather than less. The change took effect on March 3. 127# 128# Zone NAME GMTOFF RULES FORMAT [UNTIL] 129# 130# Buenos Aires (BA), Capital Federal (CF), Santa Cruz (SC), 131# Tierra del Fuego, Antartida e Islas del Atlantico Sur (TF) 132Zone America/Buenos_Aires -3:53:48 - LMT 1894 Nov 133 -4:16:44 - CMT 1920 May # Cordoba Mean Time 134 -4:00 - ART 1930 Dec 135 -4:00 Arg AR%sT 1969 Oct 5 136 -3:00 Arg AR%sT 1999 Oct 3 0:00 137 -4:00 Arg AR%sT 2000 Mar 3 0:00 138 -3:00 - ART 139# 140# Santa Fe (SF), Entre Rios (ER), Corrientes (CN), Misiones (MN), Chaco (CC), 141# Formosa (FM), La Pampa (LP), Chubut (CH) 142Zone America/Rosario -4:02:40 - LMT 1894 Nov 143 -4:16:44 - CMT 1920 May 144 -4:00 - ART 1930 Dec 145 -4:00 Arg AR%sT 1969 Oct 5 146 -3:00 Arg AR%sT 1991 Jul 147 -3:00 - ART 1999 Oct 3 0:00 148 -4:00 Arg AR%sT 2000 Mar 3 0:00 149 -3:00 - ART 150# 151# Cordoba (CB), Santiago del Estero (SE), Salta (SA), Tucuman (TM), La Rioja (LR), San Juan (SJ), San Luis (SL), 152# Neuquen (NQ), Rio Negro (RN) 153Zone America/Cordoba -4:16:44 - LMT 1894 Nov 154 -4:16:44 - CMT 1920 May 155 -4:00 - ART 1930 Dec 156 -4:00 Arg AR%sT 1969 Oct 5 157 -3:00 Arg AR%sT 1990 Jul 158 -3:00 - ART 1999 Oct 3 0:00 159 -4:00 Arg AR%sT 2000 Mar 3 0:00 160 -3:00 - ART 161# 162# Jujuy (JY) 163Zone America/Jujuy -4:21:12 - LMT 1894 Nov 164 -4:16:44 - CMT 1920 May 165 -4:00 - ART 1930 Dec 166 -4:00 Arg AR%sT 1969 Oct 5 167 -3:00 Arg AR%sT 1991 Mar 3 168 -4:00 - WART 1991 Oct 6 169 -4:00 1:00 WARST 1992 Mar 15 170 -4:00 - WART 1992 Oct 18 171 -3:00 - ART 1999 Oct 3 0:00 172 -4:00 Arg AR%sT 2000 Mar 3 0:00 173 -3:00 - ART 174# 175# Catamarca (CT) 176Zone America/Catamarca -4:23:08 - LMT 1894 Nov 177 -4:16:44 - CMT 1920 May 178 -4:00 - ART 1930 Dec 179 -4:00 Arg AR%sT 1969 Oct 5 180 -3:00 Arg AR%sT 1990 Jul 181 -3:00 - ART 1991 Jul 182 -3:00 Arg AR%sT 1992 Jul 183 -3:00 - ART 1999 Oct 3 0:00 184 -4:00 Arg AR%sT 2000 Mar 3 0:00 185 -3:00 - ART 186# 187# Mendoza (MZ) 188Zone America/Mendoza -4:35:16 - LMT 1894 Nov 189 -4:16:44 - CMT 1920 May 190 -4:00 - ART 1930 Dec 191 -4:00 Arg AR%sT 1969 Oct 5 192 -3:00 Arg AR%sT 1991 Mar 3 193 -4:00 - WART 1991 Oct 15 194 -4:00 1:00 WARST 1992 Mar 1 195 -4:00 - WART 1992 Oct 18 196 -3:00 - ART 1999 Oct 3 0:00 197 -4:00 Arg AR%sT 2000 Mar 3 0:00 198 -3:00 - ART 199 200# Aruba 201# Zone NAME GMTOFF RULES FORMAT [UNTIL] 202Zone America/Aruba -4:40:24 - LMT 1912 Feb 12 # Oranjestad 203 -4:30 - ANT 1965 # Netherlands Antilles Time 204 -4:00 - AST 205 206# Bolivia 207# Zone NAME GMTOFF RULES FORMAT [UNTIL] 208Zone America/La_Paz -4:32:36 - LMT 1890 209 -4:32:36 - LPMT 1931 Oct 15 # La Paz Mean Time 210 -4:32:36 1:00 BOST 1932 Mar 21 # Bolivia ST 211 -4:00 - BOT # Bolivia Time 212 213# Brazil 214 215# From Paul Eggert <eggert@twinsun.com> (1993-11-18): 216# The mayor of Rio recently attempted to change the time zone rules 217# just in his city, in order to leave more summer time for the tourist trade. 218# The rule change lasted only part of the day; 219# the federal government refused to follow the city's rules, and business 220# was in a chaos, so the mayor backed down that afternoon. 221 222# From IATA SSIM (1996-02): 223# _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS), 224# Santa Catarina (SC), Parana (PR), Sao Paulo (SP), Rio de Janeiro (RJ), 225# Espirito Santo (ES), Minas Gerais (MG), Bahia (BA), Goias (GO), 226# Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL]. 227# [The last three states are new to this issue of the IATA SSIM.] 228 229# From Gwillim Law (1996-10-07): 230# Geography, history (Tocantins was part of Goias until 1989), and other 231# sources of time zone information lead me to believe that AL, SE, and TO were 232# always in BR1, and so the only change was whether or not they observed DST.... 233# The earliest issue of the SSIM I have is 2/91. Each issue from then until 234# 9/95 says that DST is observed only in the ten states I quoted from 9/95, 235# along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2 236# (UTC-4).... The other two time zones given for Brazil are BR3, which is 237# UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is 238# UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's 239# become part of the state of Pernambuco). The boundary between BR1 and BR2 240# has never been clearly stated. They've simply been called East and West. 241# However, some conclusions can be drawn from another IATA manual: the Airline 242# Coding Directory, which lists close to 400 airports in Brazil. For each 243# airport it gives a time zone which is coded to the SSIM. From that 244# information, I'm led to conclude that the states of Amapa (AP), Ceara (CE), 245# Maranhao (MA), Paraiba (PR), Pernambuco (PE), Piaui (PI), and Rio Grande do 246# Norte (RN), and the eastern part of Para (PA) are all in BR1 without DST. 247 248# From Marcos Tadeu (1998-09-27): 249# <a href="http://pcdsh01.on.br/verao1.html"> 250# Brazilian official page 251# </a> 252# 253# From Paul Eggert (1998-10-29): 254# The official decrees referenced below are taken from 255# <a href="http://pcdsh01.on.br/DecHV.html"> 256# Decretos sobre o Horario de Verao no Brasil 257# </a> (1999-10-04, in Portuguese). 258 259# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 260# Decree <a href="http://pcdsh01.on.br/HV20466.htm">20,466</a> (1931-10-01) 261# Decree <a href="http://pcdsh01.on.br/HV21896.htm">21,896</a> (1932-01-10) 262Rule Brazil 1931 only - Oct 3 11:00 1:00 S 263Rule Brazil 1932 1933 - Apr 1 0:00 0 - 264Rule Brazil 1932 only - Oct 3 0:00 1:00 S 265# Decree <a href="http://pcdsh01.on.br/HV23195.htm">23,195</a> (1933-10-10) 266# revoked DST. 267# Decree <a href="http://pcdsh01.on.br/HV27496.htm">27,496</a> (1949-11-24) 268# Decree <a href="http://pcdsh01.on.br/HV27998.htm">27,998</a> (1950-04-13) 269Rule Brazil 1949 1952 - Dec 1 0:00 1:00 S 270Rule Brazil 1950 only - Apr 16 1:00 0 - 271Rule Brazil 1951 1952 - Apr 1 0:00 0 - 272# Decree <a href="http://pcdsh01.on.br/HV32308.htm">32,308</a> (1953-02-24) 273Rule Brazil 1953 only - Mar 1 0:00 0 - 274# Decree <a href="http://pcdsh01.on.br/HV34724.htm">34,724</a> (1953-11-30) 275# revoked DST. 276# Decree <a href="http://pcdsh01.on.br/HV52700.htm">52,700</a> (1963-10-18) 277# established DST from 1963-10-23 00:00 to 1964-02-29 00:00 278# in SP, RJ, GB, MG, ES, due to the prolongation of the drought. 279# Decree <a href="http://pcdsh01.on.br/HV53071.htm">53,071</a> (1963-12-03) 280# extended the above decree to all of the national territory on 12-09. 281Rule Brazil 1963 only - Dec 9 0:00 1:00 S 282# Decree <a href="http://pcdsh01.on.br/HV53604.htm">53,604</a> (1964-02-25) 283# extended summer time by one day to 1964-03-01 00:00 (start of school). 284Rule Brazil 1964 only - Mar 1 0:00 0 - 285# Decree <a href="http://pcdsh01.on.br/HV55639.htm">55,639</a> (1965-01-27) 286Rule Brazil 1965 only - Jan 31 0:00 1:00 S 287Rule Brazil 1965 only - Mar 31 0:00 0 - 288# Decree <a href="http://pcdsh01.on.br/HV57303.htm">57,303</a> (1965-11-22) 289Rule Brazil 1965 only - Dec 1 0:00 1:00 S 290# Decree <a href="http://pcdsh01.on.br/HV57843.htm">57,843</a> (1966-02-18) 291Rule Brazil 1966 1968 - Mar 1 0:00 0 - 292Rule Brazil 1966 1967 - Nov 1 0:00 1:00 S 293# Decree <a href="http://pcdsh01.on.br/HV63429.htm">63,429</a> (1968-10-15) 294# revoked DST. 295# Decree <a href="http://pcdsh01.on.br/HV91698.htm">91,698</a> (1985-09-27) 296Rule Brazil 1985 only - Nov 2 0:00 1:00 S 297# Decree 92,310 (1986-01-21) 298# Decree 92,463 (1986-03-13) 299Rule Brazil 1986 only - Mar 15 0:00 0 - 300# Decree 93,316 (1986-10-01) 301Rule Brazil 1986 only - Oct 25 0:00 1:00 S 302Rule Brazil 1987 only - Feb 14 0:00 0 - 303# Decree <a href="http://pcdsh01.on.br/HV94922.htm">94,922</a> (1987-09-22) 304Rule Brazil 1987 only - Oct 25 0:00 1:00 S 305Rule Brazil 1988 only - Feb 7 0:00 0 - 306# Decree <a href="http://pcdsh01.on.br/HV96676.htm">96,676</a> (1988-09-12) 307# except for the states of AC, AM, PA, RR, RO, and AP (then a territory) 308Rule Brazil 1988 only - Oct 16 0:00 1:00 S 309Rule Brazil 1989 only - Jan 29 0:00 0 - 310# Decree <a href="http://pcdsh01.on.br/HV98077.htm">98,077</a> (1989-08-21) 311# with the same exceptions 312Rule Brazil 1989 only - Oct 15 0:00 1:00 S 313Rule Brazil 1990 only - Feb 11 0:00 0 - 314# Decree <a href="http://pcdsh01.on.br/HV99530.htm">99,530</a> (1990-09-17) 315# adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF. 316# Decree 99,629 (1990-10-19) adds BA, MT. 317Rule Brazil 1990 only - Oct 21 0:00 1:00 S 318Rule Brazil 1991 only - Feb 17 0:00 0 - 319# <a href="http://pcdsh01.on.br/HV1991.htm">Unnumbered decree</a> (1991-09-25) 320# adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF. 321Rule Brazil 1991 only - Oct 20 0:00 1:00 S 322Rule Brazil 1992 only - Feb 9 0:00 0 - 323# <a href="http://pcdsh01.on.br/HV1992.htm">Unnumbered decree</a> (1992-10-16) 324# adopted by same states. 325Rule Brazil 1992 only - Oct 25 0:00 1:00 S 326Rule Brazil 1993 only - Jan 31 0:00 0 - 327# Decree <a href="http://pcdsh01.on.br/HV942.htm">942</a> (1993-09-28) 328# adopted by same states, plus AM. 329# Decree <a href="http://pcdsh01.on.br/HV1252.htm">1,252</a> (1994-09-22) 330# adopted by same states, minus AM. 331# Decree <a href="http://pcdsh01.on.br/HV1636.htm">1,636</a> (1995-09-14) 332# adopted by same states, plus TO. 333# Decree <a href="http://pcdsh01.on.br/HV1674.htm">1,674</a> (1995-10-13) 334# adds AL, SE. 335Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 S 336Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 - 337Rule Brazil 1996 only - Feb 11 0:00 0 - 338# Decree <a href="http://pcdsh01.on.br/HV2000.htm">2,000</a> (1996-09-04) 339# adopted by same states, minus AL, SE. 340Rule Brazil 1996 only - Oct 6 0:00 1:00 S 341Rule Brazil 1997 only - Feb 16 0:00 0 - 342# From Daniel C. Sobral <dcs@gns.com.br> (1998-02-12): 343# In 1997, the DS began on October 6. The stated reason was that 344# because international television networks ignored Brazil's policy on DS, 345# they bought the wrong times on satellite for coverage of Pope's visit. 346# This year, the ending date of DS was postponed to March 1 347# to help dealing with the shortages of electric power. 348# 349# From Paul Eggert (1998-02-25): 350# <a href="http://churchnet.ucsm.ac.uk/news/files2/news165.htm"> 351# Brazil Prepares for Papal Visit 352# </a>, 353# Church Net UK (1997-10-02). 354# 355# Decree 2,317 (1997-09-04), adopted by same states. 356Rule Brazil 1997 only - Oct 6 0:00 1:00 S 357# Decree <a href="http://pcdsh01.on.br/figuras/HV2495.JPG">2,495</a> 358# (1998-02-10) 359Rule Brazil 1998 only - Mar 1 0:00 0 - 360# Decree <a href="http://pcdsh01.on.br/figuras/Hv98.jpg">2,780</a> (1998-09-11) 361# adopted by the same states as before. 362Rule Brazil 1998 only - Oct 11 0:00 1:00 S 363Rule Brazil 1999 only - Feb 21 0:00 0 - 364# Decree <a href="http://pcdsh01.on.br/figuras/HV3150.gif">3,150</a> 365# (1999-08-23) adopted by same states. 366# Decree <a href="http://pcdsh01.on.br/DecHV99.gif">3,188</a> (1999-09-30) 367# adds SE, AL, PE, PR, RN, CE, PI, MA and RR. 368# These give only one year's rules. After that, the rules are guesses 369# and are quite possibly wrong, but are more likely than no DST at all. 370Rule Brazil 1999 max - Oct Sun>=1 0:00 1:00 S 371Rule Brazil 2000 max - Feb lastSun 0:00 0 - 372 373 374# Zone NAME GMTOFF RULES FORMAT [UNTIL] 375# 376# Fernando de Noronha 377Zone America/Noronha -2:09:40 - LMT 1914 378 -2:00 Brazil FN%sT 1990 Sep 17 379 -2:00 - FNT 380# 381# Amapa (AP), east Para (PA) 382Zone America/Belem -3:13:56 - LMT 1914 383 -3:00 Brazil BR%sT 1988 Sep 12 384 -3:00 - BRT 385# 386# Maranhao (MA), Piaui (PI), Ceara (CE), Rio Grande do Norte (RN), 387# Paraiba (PB), Pernambuco (PE) (except Fernando de Noronha) 388Zone America/Fortaleza -2:34:00 - LMT 1914 389 -3:00 Brazil BR%sT 1990 Sep 17 390 -3:00 - BRT 1999 Sep 30 391 -3:00 Brazil BR%sT 392# 393# Tocantins (TO) 394Zone America/Araguaina -3:12:48 - LMT 1914 395 -3:00 Brazil BR%sT 1990 Sep 17 396 -3:00 - BRT 1995 Sep 14 397 -3:00 Brazil BR%sT 398# 399# Alagoas (AL), Sergipe (SE) 400Zone America/Maceio -2:22:52 - LMT 1914 401 -3:00 Brazil BR%sT 1990 Sep 17 402 -3:00 - BRT 1995 Oct 13 403 -3:00 Brazil BR%sT 1996 Sep 4 404 -3:00 - BRT 1999 Sep 30 405 -3:00 Brazil BR%sT 406# 407# Bahia (BA), Goias (GO), Distrito Federal (DF), Minas Gerais (MG), 408# Espirito Santo (ES), Rio de Janeiro (RJ), Sao Paulo (SP), Parana (PR), 409# Santa Catarina (SC), Rio Grande do Sul (RS) 410Zone America/Sao_Paulo -3:06:28 - LMT 1914 411 -3:00 Brazil BR%sT 1963 Oct 23 00:00 412 -3:00 1:00 BRST 1964 413 -3:00 Brazil BR%sT 414# 415# Mato Grosso, Mato Grosso do Sul 416Zone America/Cuiaba -3:44:20 - LMT 1914 417 -4:00 Brazil AM%sT 418# 419# west Para (PA), Rondonia (RO) 420Zone America/Porto_Velho -4:15:36 - LMT 1914 421 -4:00 Brazil AM%sT 1988 Sep 12 422 -4:00 - AMT 423# 424# Roraima (RR) 425Zone America/Boa_Vista -4:02:40 - LMT 1914 426 -4:00 Brazil AM%sT 1988 Sep 12 427 -4:00 - AMT 1999 Sep 30 428 -4:00 Brazil AM%sT 429# 430# Amazonas (AM) 431Zone America/Manaus -4:00:04 - LMT 1914 432 -4:00 Brazil AM%sT 1988 Sep 12 433 -4:00 - AMT 1993 Sep 28 434 -4:00 Brazil AM%sT 1994 Sep 22 435 -4:00 - AMT 436# 437# Acre (AC) 438# Rio_Branco is too ambiguous, since there's a Rio Branco in Uruguay too. 439Zone America/Porto_Acre -4:31:12 - LMT 1914 440 -5:00 Brazil AC%sT 1988 Sep 12 441 -5:00 - ACT 442# 443# Martin Vaz and Trindade are like America/Noronha. 444 445 446# Chile 447 448# From Eduardo Krell (1995-10-19): 449# The law says to switch to DST at midnight [24:00] on the second SATURDAY 450# of October.... The law is the same for March and October. 451# (1998-09-29): 452# Because of the drought this year, the government decided to go into 453# DST earlier (saturday 9/26 at 24:00). This is a one-time change only ... 454# (unless there's another dry season next year, I guess). 455 456# From Julio I. Pacheco Troncoso (1999-03-18): 457# Because of the same drought, the government decided to end DST later, 458# on April 3, (one-time change). 459 460# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 461Rule Chile 1918 only - Sep 1 0:00 1:00 S 462Rule Chile 1919 only - Jul 2 0:00 0 - 463Rule Chile 1927 1931 - Sep 1 0:00 1:00 S 464Rule Chile 1928 1932 - Apr 1 0:00 0 - 465Rule Chile 1969 1997 - Oct Sun>=9 0:00 1:00 S 466Rule Chile 1970 1998 - Mar Sun>=9 0:00 0 - 467Rule Chile 1998 only - Sep 27 0:00 1:00 S 468Rule Chile 1999 only - Apr 4 0:00 0 - 469Rule Chile 1999 max - Oct Sun>=9 0:00 1:00 S 470Rule Chile 2000 max - Mar Sun>=9 0:00 0 - 471# IATA SSIM anomalies: (1990-09) says 1990-09-16; (1992-02) says 1992-03-14; 472# (1996-09) says 1998-03-08. Ignore these. 473# Zone NAME GMTOFF RULES FORMAT [UNTIL] 474Zone America/Santiago -4:42:40 - LMT 1890 475 -4:42:40 - SMT 1910 # Santiago Mean Time 476 -5:00 Chile CL%sT 1932 Sep # Chile Time 477 -4:00 Chile CL%sT 478Zone Pacific/Easter -7:17:28 - LMT 1890 # Mataveri 479 -7:17:28 - MMT 1932 Sep # Mataveri Mean Time 480 -7:00 Chile EAS%sT 1982 Mar 14 # Easter I Time 481 -6:00 Chile EAS%sT 482# 483# Whitman says Juan Fernandez Is are like America/Santiago. 484# San Ambrosio, San Felix 485# no information; probably like America/Santiago 486 487 488# Colombia 489# Shanks specifies 24:00 for 1992 transition times; go with IATA, 490# as it seems implausible to change clocks at midnight New Year's Eve. 491# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 492Rule CO 1992 only - May 2 0:00 1:00 S 493Rule CO 1992 only - Dec 31 0:00 0 - 494# Zone NAME GMTOFF RULES FORMAT [UNTIL] 495Zone America/Bogota -4:56:20 - LMT 1884 Mar 13 496 -4:56:20 - BMT 1914 Nov 23 # Bogota Mean Time 497 -5:00 CO CO%sT # Colombia Time 498# Malpelo, Providencia, San Andres 499# no information; probably like America/Bogota 500 501# Curacao 502# Shanks says that Bottom and Oranjestad have been at -4:00 since 503# standard time was introduced on 1912-03-02; and that Kralendijk and Rincon 504# used Kralendijk Mean Time (-4:33:08) from 1912-02-02 to 1965-01-01. 505# This all predates our 1970 cutoff, though. 506# Zone NAME GMTOFF RULES FORMAT [UNTIL] 507Zone America/Curacao -4:35:44 - LMT 1912 Feb 12 # Willemstad 508 -4:30 - ANT 1965 # Netherlands Antilles Time 509 -4:00 - AST 510 511# Ecuador 512# Zone NAME GMTOFF RULES FORMAT [UNTIL] 513Zone America/Guayaquil -5:19:20 - LMT 1890 514 -5:14:00 - QMT 1931 # Quito Mean Time 515 -5:00 - ECT # Ecuador Time 516Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno 517 -5:00 - ECT 1986 518 -6:00 - GALT # Galapagos Time 519 520# Falklands 521# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 522Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 S 523Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 - 524Rule Falk 1939 only - Oct 1 0:00 1:00 S 525Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 S 526Rule Falk 1943 only - Jan 1 0:00 0 - 527Rule Falk 1983 only - Sep lastSun 0:00 1:00 S 528Rule Falk 1984 1985 - Apr lastSun 0:00 0 - 529Rule Falk 1984 only - Sep 16 0:00 1:00 S 530Rule Falk 1985 1995 - Sep Sun>=9 0:00 1:00 S 531Rule Falk 1986 max - Apr Sun>=16 0:00 0 - 532Rule Falk 1996 max - Sep Sun>=8 0:00 1:00 S 533# Zone NAME GMTOFF RULES FORMAT [UNTIL] 534Zone Atlantic/Stanley -3:51:24 - LMT 1890 535 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time 536 -4:00 Falk FK%sT 1983 May # Falkland Is Time 537 -3:00 Falk FK%sT 1985 Sep 15 538 -4:00 Falk FK%sT 539 540# French Guiana 541# Zone NAME GMTOFF RULES FORMAT [UNTIL] 542Zone America/Cayenne -3:29:20 - LMT 1911 Jul 543 -4:00 - GFT 1967 Oct # French Guiana Time 544 -3:00 - GFT 545 546# Guyana 547# Zone NAME GMTOFF RULES FORMAT [UNTIL] 548Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown 549 -3:45 - GBGT 1966 May 26 # Br Guiana Time 550 -3:45 - GYT 1975 Jul 31 # Guyana Time 551 -3:00 - GYT 1991 552# IATA SSIM (1996-06) says -4:00. Assume a 1991 switch. 553 -4:00 - GYT 554 555# Paraguay 556# From Paul Eggert (1999-10-29): 557# Shanks (1999) says that spring transitions are from 01:00 -> 02:00, 558# and autumn transitions are from 00:00 -> 23:00. Go with earlier 559# editions of Shanks, and with the IATA, who say transitions occur at 00:00. 560# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 561Rule Para 1975 1988 - Oct 1 0:00 1:00 S 562Rule Para 1975 1978 - Mar 1 0:00 0 - 563Rule Para 1979 1991 - Apr 1 0:00 0 - 564Rule Para 1989 only - Oct 22 0:00 1:00 S 565Rule Para 1990 only - Oct 1 0:00 1:00 S 566Rule Para 1991 only - Oct 6 0:00 1:00 S 567Rule Para 1992 only - Mar 1 0:00 0 - 568Rule Para 1992 only - Oct 5 0:00 1:00 S 569Rule Para 1993 only - Mar 31 0:00 0 - 570Rule Para 1993 1995 - Oct 1 0:00 1:00 S 571Rule Para 1994 1995 - Feb lastSun 0:00 0 - 572Rule Para 1996 only - Mar 1 0:00 0 - 573# IATA SSIM (1997-09) says Mar 1; go with Shanks. 574Rule Para 1997 only - Feb lastSun 0:00 0 - 575Rule Para 1998 only - Mar 1 0:00 0 - 576Rule Para 1996 1998 - Oct Sun>=1 0:00 1:00 S 577# IATA SSIM (1999-02) says lastSat, not lastSun; (1999-09) reports no date; 578# go with Shanks. 579Rule Para 1999 max - Feb lastSun 0:00 0 - 580# IATA SSIM (2000-02) says 1999-10-10. 581Rule Para 1999 max - Oct Sun>=8 0:00 1:00 S 582# Zone NAME GMTOFF RULES FORMAT [UNTIL] 583Zone America/Asuncion -3:50:40 - LMT 1890 584 -3:50:40 - AMT 1931 Oct 10 # Asuncion Mean Time 585 -4:00 - PYT 1972 Oct # Paraguay Time 586 -3:00 - PYT 1974 Apr 587 -4:00 Para PY%sT 588 589# Peru 590# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 591Rule Peru 1938 only - Jan 1 0:00 1:00 S 592Rule Peru 1938 only - Apr 1 0:00 0 - 593Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 S 594Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 - 595Rule Peru 1987 only - Jan 1 0:00 1:00 S 596Rule Peru 1987 only - Apr 1 0:00 0 - 597Rule Peru 1990 only - Jan 1 0:00 1:00 S 598Rule Peru 1990 only - Apr 1 0:00 0 - 599# IATA is ambiguous for 1993/1995; go with Shanks. 600Rule Peru 1994 only - Jan 1 0:00 1:00 S 601Rule Peru 1994 only - Apr 1 0:00 0 - 602# Zone NAME GMTOFF RULES FORMAT [UNTIL] 603Zone America/Lima -5:08:12 - LMT 1890 604 -5:09 - LMT 1908 Jul 28 # Lima Mean Time 605 -5:00 Peru PE%sT # Peru Time 606 607# South Georgia 608# Zone NAME GMTOFF RULES FORMAT [UNTIL] 609Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken 610 -2:00 - GST # South Georgia Time 611 612# South Sandwich Is 613# uninhabited; scientific personnel have wintered 614 615# Suriname 616# Zone NAME GMTOFF RULES FORMAT [UNTIL] 617Zone America/Paramaribo -3:40:40 - LMT 1911 618 -3:40:52 - PMT 1935 # Paramaribo Mean Time 619 -3:40:36 - PMT 1945 Oct # The capital moved? 620 -3:30 - NEGT 1975 Nov 20 # Dutch Guiana Time 621 -3:30 - SRT 1984 Oct # Suriname Time 622 -3:00 - SRT 623 624# Trinidad and Tobago 625# Zone NAME GMTOFF RULES FORMAT [UNTIL] 626Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2 627 -4:00 - AST 628 629# Uruguay 630# From Paul Eggert <eggert@twinsun.com> (1993-11-18): 631# Uruguay wins the prize for the strangest peacetime manipulation of the rules. 632# From Shanks: 633# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 634# Whitman gives 1923 Oct 1; go with Shanks. 635Rule Uruguay 1923 only - Oct 2 0:00 0:30 HS 636Rule Uruguay 1924 1926 - Apr 1 0:00 0 - 637Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS 638Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS 639# Shanks gives 1935 Apr 1 0:00 and 1936 Mar 30 0:00; go with Whitman. 640Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 - 641Rule Uruguay 1936 only - Nov 1 0:00 0:30 HS 642Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 - 643# Whitman gives 1937 Oct 3; go with Shanks. 644Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HS 645# Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13, 646# and 1943 Apr 13 ``to present time''; go with Shanks. 647Rule Uruguay 1941 only - Aug 1 0:00 0 - 648Rule Uruguay 1942 only - Jan 1 0:00 0:30 HS 649Rule Uruguay 1942 only - Dec 14 0:00 1:00 S 650Rule Uruguay 1943 only - Mar 14 0:00 0 - 651Rule Uruguay 1959 only - May 24 0:00 1:00 S 652Rule Uruguay 1959 only - Nov 15 0:00 0 - 653Rule Uruguay 1960 only - Jan 17 0:00 1:00 S 654Rule Uruguay 1960 only - Mar 6 0:00 0 - 655Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 S 656Rule Uruguay 1965 only - Sep 26 0:00 0 - 657Rule Uruguay 1966 1967 - Oct 31 0:00 0 - 658Rule Uruguay 1968 1970 - May 27 0:00 0:30 HS 659Rule Uruguay 1968 1970 - Dec 2 0:00 0 - 660Rule Uruguay 1972 only - Apr 24 0:00 1:00 S 661Rule Uruguay 1972 only - Aug 15 0:00 0 - 662Rule Uruguay 1974 only - Mar 10 0:00 0:30 HS 663Rule Uruguay 1974 only - Dec 22 0:00 1:00 S 664Rule Uruguay 1976 only - Oct 1 0:00 0 - 665Rule Uruguay 1977 only - Dec 4 0:00 1:00 S 666Rule Uruguay 1978 only - Apr 1 0:00 0 - 667Rule Uruguay 1979 only - Oct 1 0:00 1:00 S 668Rule Uruguay 1980 only - May 1 0:00 0 - 669Rule Uruguay 1987 only - Dec 14 0:00 1:00 S 670Rule Uruguay 1988 only - Mar 14 0:00 0 - 671Rule Uruguay 1988 only - Dec 11 0:00 1:00 S 672Rule Uruguay 1989 only - Mar 12 0:00 0 - 673Rule Uruguay 1989 only - Oct 29 0:00 1:00 S 674# Shanks says no DST was observed in 1990/1 and 1991/2, 675# and that 1992/3's DST was from 10-25 to 03-01. Go with IATA. 676Rule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 - 677Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S 678Rule Uruguay 1992 only - Oct 18 0:00 1:00 S 679Rule Uruguay 1993 only - Feb 28 0:00 0 - 680# Zone NAME GMTOFF RULES FORMAT [UNTIL] 681Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28 682 -3:44:44 - MMT 1920 May 1 # Montevideo MT 683 -3:30 Uruguay UY%sT 1942 Dec 14 # Uruguay Time 684 -3:00 Uruguay UY%sT 685 686# Venezuela 687# Zone NAME GMTOFF RULES FORMAT [UNTIL] 688Zone America/Caracas -4:27:44 - LMT 1890 689 -4:27:44 - CMT 1912 Feb 12 # Caracas Mean Time 690 -4:30 - VET 1965 # Venezuela Time 691 -4:00 - VET 692
