southamerica revision 58787
1# @(#)southamerica 7.35 2# $FreeBSD: head/share/zoneinfo/southamerica 58787 2000-03-29 14:01:46Z ru $ 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 <eggert@twinsun.com> (1999-07-07): 9# A good source for time zone historical data outside the U.S. is 10# Thomas G. Shanks, The International Atlas (5th edition), 11# San Diego: ACS Publications, Inc. (1999). 12# 13# Gwillim Law <Gwil_Law@bridge-point.com> 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 is the source for entries through 1990, 20# and IATA SSIM is the source for entries after 1990. 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 <hernan@isoft.com.ar> (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 1 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 1974 1976 - Oct Sun>=1 0:00 1:00 S 89Rule Arg 1975 1977 - Apr Sun>=1 0:00 0 - 90Rule Arg 1985 only - Nov 2 0:00 1:00 S 91Rule Arg 1986 only - Mar 14 0:00 0 - 92Rule Arg 1986 1987 - Oct 25 0:00 1:00 S 93Rule Arg 1987 only - Feb 13 0:00 0 - 94Rule Arg 1988 only - Feb 7 0:00 0 - 95Rule Arg 1988 only - Dec 1 0:00 1:00 S 96# 97# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26): 98# These corrections were contributed by InterSoft Argentina S.A., 99# obtaining the data from the: 100# Talleres de Hidrografia Naval Argentina 101# (Argentine Naval Hydrography Institute) 102# 103# Shanks stops after 1992-03-01; go with Otero. 104Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 - 105Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 S 106# 107# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26): 108# From this moment on, the law that mandated the daylight saving 109# time corrections was derogated and no more modifications 110# to the time zones (for daylight saving) are now made. 111# 112# From Rives McDow (2000-01-10): 113# On October 3, 1999, 0:00 local, Argentina implemented daylight savings time, 114# which did not result in the switch of a time zone, as they stayed 9 hours 115# from the International Date Line. On March 5, 2000, at 0:00 local time, 116# Argentina will come off daylight savings time, which will bring them to 8 117# hours from the International Date Line. 118# 119# From Peter Gradelski via Steffen Thorsen (2000-03-01): 120# We just checked with our San Paulo office and they say the government of 121# Argentina decided not to become one of the countries that go on or off DST. 122# So Buenos Aires should be -3 hours from GMT at all times. 123# 124# Zone NAME GMTOFF RULES FORMAT [UNTIL] 125# 126# Buenos Aires (BA), Distrito Federal (DF), Santa Cruz (SC), 127# Tierra del Fuego (TF) & Antartida e Islas 128Zone America/Buenos_Aires -3:53:48 - LMT 1894 Nov 129 -4:16:44 - CMT 1920 May # Cordoba Mean Time 130 -4:00 - ART 1930 Dec 131 -4:00 Arg AR%sT 1969 Oct 5 132 -3:00 Arg AR%sT 133# 134# Santa Fe (SF), Entre Rios (ER), Corrientes (CN), Misiones (MN), Chaco (CC), 135# Formosa (FM), La Pampa (LP), Chubut (CH) 136Zone America/Rosario -4:02:40 - LMT 1894 Nov 137 -4:16:44 - CMT 1920 May 138 -4:00 - ART 1930 Dec 139 -4:00 Arg AR%sT 1969 Oct 5 140 -3:00 Arg AR%sT 1991 Jul 141 -3:00 - ART 142# 143# Cordoba (CB), Santiago del Estero (SE), Salta (SA), Tucuman (TM), La Rioja (LR), San Juan (SJ), San Luis (SL), 144# Neuquen (NQ), Rio Negro (RN) 145Zone America/Cordoba -4:16:44 - LMT 1894 Nov 146 -4:16:44 - CMT 1920 May 147 -4:00 - ART 1930 Dec 148 -4:00 Arg AR%sT 1969 Oct 5 149 -3:00 Arg AR%sT 1990 Jul 150 -3:00 - ART 151# 152# Jujuy (JY) 153Zone America/Jujuy -4:21:12 - 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 1991 Mar 3 158 -4:00 - WART 1991 Oct 6 159 -4:00 1:00 WARST 1992 Mar 15 160 -4:00 - WART 1992 Oct 18 161 -3:00 - ART 162# 163# Catamarca (CT) 164Zone America/Catamarca -4:23:08 - LMT 1894 Nov 165 -4:16:44 - CMT 1920 May 166 -4:00 - ART 1930 Dec 167 -4:00 Arg AR%sT 1969 Oct 5 168 -3:00 Arg AR%sT 1990 Jul 169 -3:00 - ART 1991 Jul 170 -3:00 Arg AR%sT 1992 Jul 171 -3:00 - ART 172# 173# Mendoza (MZ) 174Zone America/Mendoza -4:35:16 - LMT 1894 Nov 175 -4:16:44 - CMT 1920 May 176 -4:00 - ART 1930 Dec 177 -4:00 Arg AR%sT 1969 Oct 5 178 -3:00 Arg AR%sT 1991 Mar 3 179 -4:00 - WART 1991 Oct 15 180 -4:00 1:00 WARST 1992 Mar 1 181 -4:00 - WART 1992 Oct 18 182 -3:00 - ART 183 184# Aruba 185# Zone NAME GMTOFF RULES FORMAT [UNTIL] 186Zone America/Aruba -4:40:24 - LMT 1912 Feb 12 # Oranjestad 187 -4:30 - ANT 1965 # Netherlands Antilles Time 188 -4:00 - AST 189 190# Bolivia 191# Zone NAME GMTOFF RULES FORMAT [UNTIL] 192Zone America/La_Paz -4:32:36 - LMT 1890 193 -4:32:36 - LPMT 1931 Oct 15 # La Paz Mean Time 194 -4:32:36 1:00 BOST 1932 Mar 21 # Bolivia ST 195 -4:00 - BOT # Bolivia Time 196 197# Brazil 198 199# From Paul Eggert <eggert@twinsun.com> (1993-11-18): 200# The mayor of Rio recently attempted to change the time zone rules 201# just in his city, in order to leave more summer time for the tourist trade. 202# The rule change lasted only part of the day; 203# the federal government refused to follow the city's rules, and business 204# was in a chaos, so the mayor backed down that afternoon. 205 206# From IATA SSIM (1996-02): 207# _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS), 208# Santa Catarina (SC), Parana (PR), Sao Paulo (SP), Rio de Janeiro (RJ), 209# Espirito Santo (ES), Minas Gerais (MG), Bahia (BA), Goias (GO), 210# Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL]. 211# [The last three states are new to this issue of the IATA SSIM.] 212 213# From Gwillim Law (1996-10-07): 214# Geography, history (Tocantins was part of Goias until 1989), and other 215# sources of time zone information lead me to believe that AL, SE, and TO were 216# always in BR1, and so the only change was whether or not they observed DST.... 217# The earliest issue of the SSIM I have is 2/91. Each issue from then until 218# 9/95 says that DST is observed only in the ten states I quoted from 9/95, 219# along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2 220# (UTC-4).... The other two time zones given for Brazil are BR3, which is 221# UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is 222# UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's 223# become part of the state of Pernambuco). The boundary between BR1 and BR2 224# has never been clearly stated. They've simply been called East and West. 225# However, some conclusions can be drawn from another IATA manual: the Airline 226# Coding Directory, which lists close to 400 airports in Brazil. For each 227# airport it gives a time zone which is coded to the SSIM. From that 228# information, I'm led to conclude that the states of Amapa (AP), Ceara (CE), 229# Maranhao (MA), Paraiba (PR), Pernambuco (PE), Piaui (PI), and Rio Grande do 230# Norte (RN), and the eastern part of Para (PA) are all in BR1 without DST. 231 232# From Marcos Tadeu (1998-09-27): 233# <a href="http://pcdsh01.on.br/verao1.html"> 234# Brazilian official page 235# </a> 236# 237# From Paul Eggert (1998-10-29): 238# The official decrees referenced below are taken from 239# <a href="http://pcdsh01.on.br/DecHV.html"> 240# Decretos sobre o Horario de Verao no Brasil 241# </a> (1999-10-04, in Portuguese). 242 243# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 244# Decree <a href="http://pcdsh01.on.br/HV20466.htm">20,466</a> (1931-10-01) 245# Decree <a href="http://pcdsh01.on.br/HV21896.htm">21,896</a> (1932-01-10) 246Rule Brazil 1931 only - Oct 3 11:00 1:00 S 247Rule Brazil 1932 1933 - Apr 1 0:00 0 - 248Rule Brazil 1932 only - Oct 3 0:00 1:00 S 249# Decree <a href="http://pcdsh01.on.br/HV23195.htm">23,195</a> (1933-10-10) 250# revoked DST. 251# Decree <a href="http://pcdsh01.on.br/HV27496.htm">27,496</a> (1949-11-24) 252# Decree <a href="http://pcdsh01.on.br/HV27998.htm">27,998</a> (1950-04-13) 253Rule Brazil 1949 1952 - Dec 1 0:00 1:00 S 254Rule Brazil 1950 only - Apr 16 1:00 0 - 255Rule Brazil 1951 1952 - Apr 1 0:00 0 - 256# Decree <a href="http://pcdsh01.on.br/HV32308.htm">32,308</a> (1953-02-24) 257Rule Brazil 1953 only - Mar 1 0:00 0 - 258# Decree <a href="http://pcdsh01.on.br/HV34724.htm">34,724</a> (1953-11-30) 259# revoked DST. 260# Decree <a href="http://pcdsh01.on.br/HV52700.htm">52,700</a> (1963-10-18) 261# established DST from 1963-10-23 00:00 to 1964-02-29 00:00 262# in SP, RJ, GB, MG, ES, due to the prolongation of the drought. 263# Decree <a href="http://pcdsh01.on.br/HV53071.htm">53,071</a> (1963-12-03) 264# extended the above decree to all of the national territory on 12-09. 265Rule Brazil 1963 only - Dec 9 0:00 1:00 S 266# Decree <a href="http://pcdsh01.on.br/HV53604.htm">53,604</a> (1964-02-25) 267# extended summer time by one day to 1964-03-01 00:00 (start of school). 268Rule Brazil 1964 only - Mar 1 0:00 0 - 269# Decree <a href="http://pcdsh01.on.br/HV55639.htm">55,639</a> (1965-01-27) 270Rule Brazil 1965 only - Jan 31 0:00 1:00 S 271Rule Brazil 1965 only - Mar 31 0:00 0 - 272# Decree <a href="http://pcdsh01.on.br/HV57303.htm">57,303</a> (1965-11-22) 273Rule Brazil 1965 only - Dec 1 0:00 1:00 S 274# Decree <a href="http://pcdsh01.on.br/HV57843.htm">57,843</a> (1966-02-18) 275Rule Brazil 1966 1968 - Mar 1 0:00 0 - 276Rule Brazil 1966 1967 - Nov 1 0:00 1:00 S 277# Decree <a href="http://pcdsh01.on.br/HV63429.htm">63,429</a> (1968-10-15) 278# revoked DST. 279# Decree <a href="http://pcdsh01.on.br/HV91698.htm">91,698</a> (1985-09-27) 280Rule Brazil 1985 only - Nov 2 0:00 1:00 S 281# Decree 92,310 (1986-01-21) 282# Decree 92,463 (1986-03-13) 283Rule Brazil 1986 only - Mar 15 0:00 0 - 284# Decree 93,316 (1986-10-01) 285Rule Brazil 1986 only - Oct 25 0:00 1:00 S 286Rule Brazil 1987 only - Feb 14 0:00 0 - 287# Decree <a href="http://pcdsh01.on.br/HV94922.htm">94,922</a> (1987-09-22) 288Rule Brazil 1987 only - Oct 25 0:00 1:00 S 289Rule Brazil 1988 only - Feb 7 0:00 0 - 290# Decree <a href="http://pcdsh01.on.br/HV96676.htm">96,676</a> (1988-09-12) 291# except for the states of AC, AM, PA, RR, RO, and AP (then a territory) 292Rule Brazil 1988 only - Oct 16 0:00 1:00 S 293Rule Brazil 1989 only - Jan 29 0:00 0 - 294# Decree <a href="http://pcdsh01.on.br/HV98077.htm">98,077</a> (1989-08-21) 295# with the same exceptions 296Rule Brazil 1989 only - Oct 15 0:00 1:00 S 297Rule Brazil 1990 only - Feb 11 0:00 0 - 298# Decree <a href="http://pcdsh01.on.br/HV99530.htm">99,530</a> (1990-09-17) 299# adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF. 300# Decree 99,629 (1990-10-19) adds BA, MT. 301Rule Brazil 1990 only - Oct 21 0:00 1:00 S 302Rule Brazil 1991 only - Feb 17 0:00 0 - 303# <a href="http://pcdsh01.on.br/HV1991.htm">Unnumbered decree</a> (1991-09-25) 304# adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF. 305Rule Brazil 1991 only - Oct 20 0:00 1:00 S 306Rule Brazil 1992 only - Feb 9 0:00 0 - 307# <a href="http://pcdsh01.on.br/HV1992.htm">Unnumbered decree</a> (1992-10-16) 308# adopted by same states. 309Rule Brazil 1992 only - Oct 25 0:00 1:00 S 310Rule Brazil 1993 only - Jan 31 0:00 0 - 311# Decree <a href="http://pcdsh01.on.br/HV942.htm">942</a> (1993-09-28) 312# adopted by same states, plus AM. 313# Decree <a href="http://pcdsh01.on.br/HV1252.htm">1,252</a> (1994-09-22) 314# adopted by same states, minus AM. 315# Decree <a href="http://pcdsh01.on.br/HV1636.htm">1,636</a> (1995-09-14) 316# adopted by same states, plus TO. 317# Decree <a href="http://pcdsh01.on.br/HV1674.htm">1,674</a> (1995-10-13) 318# adds AL, SE. 319Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 S 320Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 - 321Rule Brazil 1996 only - Feb 11 0:00 0 - 322# Decree <a href="http://pcdsh01.on.br/HV2000.htm">2,000</a> (1996-09-04) 323# adopted by same states, minus AL, SE. 324Rule Brazil 1996 only - Oct 6 0:00 1:00 S 325Rule Brazil 1997 only - Feb 16 0:00 0 - 326# From Daniel C. Sobral <dcs@gns.com.br> (1998-02-12): 327# In 1997, the DS began on October 6. The stated reason was that 328# because international television networks ignored Brazil's policy on DS, 329# they bought the wrong times on satellite for coverage of Pope's visit. 330# This year, the ending date of DS was postponed to March 1 331# to help dealing with the shortages of electric power. 332# 333# From Paul Eggert (1998-02-25): 334# <a href="http://churchnet.ucsm.ac.uk/news/files2/news165.htm"> 335# Brazil Prepares for Papal Visit 336# </a>, 337# Church Net UK (1997-10-02). 338# 339# Decree 2,317 (1997-09-04), adopted by same states. 340Rule Brazil 1997 only - Oct 6 0:00 1:00 S 341# Decree <a href="http://pcdsh01.on.br/figuras/HV2495.JPG">2,495</a> 342# (1998-02-10) 343Rule Brazil 1998 only - Mar 1 0:00 0 - 344# Decree <a href="http://pcdsh01.on.br/figuras/Hv98.jpg">2,780</a> (1998-09-11) 345# adopted by the same states as before. 346Rule Brazil 1998 only - Oct 11 0:00 1:00 S 347Rule Brazil 1999 only - Feb 21 0:00 0 - 348# Decree <a href="http://pcdsh01.on.br/figuras/HV3150.gif">3,150</a> 349# (1999-08-23) adopted by same states. 350# Decree <a href="http://pcdsh01.on.br/DecHV99.gif">3,188</a> (1999-09-30) 351# adds SE, AL, PE, PR, RN, CE, PI, MA and RR. 352# These give only one year's rules. After that, the rules are guesses 353# and are quite possibly wrong, but are more likely than no DST at all. 354Rule Brazil 1999 max - Oct Sun>=1 0:00 1:00 S 355Rule Brazil 2000 max - Feb lastSun 0:00 0 - 356 357 358# Zone NAME GMTOFF RULES FORMAT [UNTIL] 359# 360# Fernando de Noronha 361Zone America/Noronha -2:09:40 - LMT 1914 362 -2:00 Brazil FN%sT 1990 Sep 17 363 -2:00 - FNT 364# 365# Amapa (AP), east Para (PA) 366Zone America/Belem -3:13:56 - LMT 1914 367 -3:00 Brazil BR%sT 1988 Sep 12 368 -3:00 - BRT 369# 370# Maranhao (MA), Piaui (PI), Ceara (CE), Rio Grande do Norte (RN), 371# Paraiba (PB), Pernambuco (PE) (except Fernando de Noronha) 372Zone America/Fortaleza -2:34:00 - LMT 1914 373 -3:00 Brazil BR%sT 1990 Sep 17 374 -3:00 - BRT 1999 Sep 30 375 -3:00 Brazil BR%sT 376# 377# Tocantins (TO) 378Zone America/Araguaina -3:12:48 - LMT 1914 379 -3:00 Brazil BR%sT 1990 Sep 17 380 -3:00 - BRT 1995 Sep 14 381 -3:00 Brazil BR%sT 382# 383# Alagoas (AL), Sergipe (SE) 384Zone America/Maceio -2:22:52 - LMT 1914 385 -3:00 Brazil BR%sT 1990 Sep 17 386 -3:00 - BRT 1995 Oct 13 387 -3:00 Brazil BR%sT 1996 Sep 4 388 -3:00 - BRT 1999 Sep 30 389 -3:00 Brazil BR%sT 390# 391# Bahia (BA), Goias (GO), Distrito Federal (DF), Minas Gerais (MG), 392# Espirito Santo (ES), Rio de Janeiro (RJ), Sao Paulo (SP), Parana (PR), 393# Santa Catarina (SC), Rio Grande do Sul (RS) 394Zone America/Sao_Paulo -3:06:28 - LMT 1914 395 -3:00 Brazil BR%sT 1963 Oct 23 00:00 396 -3:00 1:00 BRST 1964 397 -3:00 Brazil BR%sT 398# 399# Mato Grosso, Mato Grosso do Sul 400Zone America/Cuiaba -3:44:20 - LMT 1914 401 -4:00 Brazil AM%sT 402# 403# west Para (PA), Rondonia (RO) 404Zone America/Porto_Velho -4:15:36 - LMT 1914 405 -4:00 Brazil AM%sT 1988 Sep 12 406 -4:00 - AMT 407# 408# Roraima (RR) 409Zone America/Boa_Vista -4:02:40 - LMT 1914 410 -4:00 Brazil AM%sT 1988 Sep 12 411 -4:00 - AMT 1999 Sep 30 412 -4:00 Brazil AM%sT 413# 414# Amazonas (AM) 415Zone America/Manaus -4:00:04 - LMT 1914 416 -4:00 Brazil AM%sT 1988 Sep 12 417 -4:00 - AMT 1993 Sep 28 418 -4:00 Brazil AM%sT 1994 Sep 22 419 -4:00 - AMT 420# 421# Acre (AC) 422# Rio_Branco is too ambiguous, since there's a Rio Branco in Uruguay too. 423Zone America/Porto_Acre -4:31:12 - LMT 1914 424 -5:00 Brazil AC%sT 1988 Sep 12 425 -5:00 - ACT 426# 427# Martin Vaz and Trindade are like America/Noronha. 428 429 430# Chile 431 432# From Eduardo Krell (1995-10-19): 433# The law says to switch to DST at midnight [24:00] on the second SATURDAY 434# of October.... The law is the same for March and October. 435# (1998-09-29): 436# Because of the drought this year, the government decided to go into 437# DST earlier (saturday 9/26 at 24:00). This is a one-time change only ... 438# (unless there's another dry season next year, I guess). 439 440# From Julio I. Pacheco Troncoso (1999-03-18): 441# Because of the same drought, the government decided to end DST later, 442# on April 3, (one-time change). 443 444# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 445Rule Chile 1918 only - Sep 1 0:00 1:00 S 446Rule Chile 1919 only - Jul 2 0:00 0 - 447Rule Chile 1927 1931 - Sep 1 0:00 1:00 S 448Rule Chile 1928 1932 - Apr 1 0:00 0 - 449Rule Chile 1969 1997 - Oct Sun>=9 0:00 1:00 S 450Rule Chile 1970 1998 - Mar Sun>=9 0:00 0 - 451Rule Chile 1998 only - Sep 27 0:00 1:00 S 452Rule Chile 1999 only - Apr 4 0:00 0 - 453Rule Chile 1999 max - Oct Sun>=9 0:00 1:00 S 454Rule Chile 2000 max - Mar Sun>=9 0:00 0 - 455# IATA SSIM anomalies: (1990-09) says 1990-09-16; (1992-02) says 1992-03-14; 456# (1996-09) says 1998-03-08. Ignore these. 457# Zone NAME GMTOFF RULES FORMAT [UNTIL] 458Zone America/Santiago -4:42:40 - LMT 1890 459 -4:42:40 - SMT 1910 # Santiago Mean Time 460 -5:00 Chile CL%sT 1932 Sep # Chile Time 461 -4:00 Chile CL%sT 462Zone Pacific/Easter -7:17:28 - LMT 1890 # Mataveri 463 -7:17:28 - MMT 1932 Sep # Mataveri Mean Time 464 -7:00 Chile EAS%sT 1982 Mar 14 # Easter I Time 465 -6:00 Chile EAS%sT 466# 467# Whitman says Juan Fernandez Is are like America/Santiago. 468# San Ambrosio, San Felix 469# no information; probably like America/Santiago 470 471 472# Colombia 473# Shanks specifies 24:00 for 1992 transition times; go with IATA, 474# as it seems implausible to change clocks at midnight New Year's Eve. 475# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 476Rule CO 1992 only - May 2 0:00 1:00 S 477Rule CO 1992 only - Dec 31 0:00 0 - 478# Zone NAME GMTOFF RULES FORMAT [UNTIL] 479Zone America/Bogota -4:56:20 - LMT 1884 Mar 13 480 -4:56:20 - BMT 1914 Nov 23 # Bogota Mean Time 481 -5:00 CO CO%sT # Colombia Time 482# Malpelo, Providencia, San Andres 483# no information; probably like America/Bogota 484 485# Curacao 486# Shanks says that Bottom and Oranjestad have been at -4:00 since 487# standard time was introduced on 1912-03-02; and that Kralendijk and Rincon 488# used Kralendijk Mean Time (-4:33:08) from 1912-02-02 to 1965-01-01. 489# This all predates our 1970 cutoff, though. 490# Zone NAME GMTOFF RULES FORMAT [UNTIL] 491Zone America/Curacao -4:35:44 - LMT 1912 Feb 12 # Willemstad 492 -4:30 - ANT 1965 # Netherlands Antilles Time 493 -4:00 - AST 494 495# Ecuador 496# Zone NAME GMTOFF RULES FORMAT [UNTIL] 497Zone America/Guayaquil -5:19:20 - LMT 1890 498 -5:14:00 - QMT 1931 # Quito Mean Time 499 -5:00 - ECT # Ecuador Time 500Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno 501 -5:00 - ECT 1986 502 -6:00 - GALT # Galapagos Time 503 504# Falklands 505# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 506Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 S 507Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 - 508Rule Falk 1939 only - Oct 1 0:00 1:00 S 509Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 S 510Rule Falk 1943 only - Jan 1 0:00 0 - 511Rule Falk 1983 only - Sep lastSun 0:00 1:00 S 512Rule Falk 1984 1985 - Apr lastSun 0:00 0 - 513Rule Falk 1984 only - Sep 16 0:00 1:00 S 514Rule Falk 1985 1995 - Sep Sun>=9 0:00 1:00 S 515Rule Falk 1986 max - Apr Sun>=16 0:00 0 - 516Rule Falk 1996 max - Sep Sun>=8 0:00 1:00 S 517# Zone NAME GMTOFF RULES FORMAT [UNTIL] 518Zone Atlantic/Stanley -3:51:24 - LMT 1890 519 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time 520 -4:00 Falk FK%sT 1983 May # Falkland Is Time 521 -3:00 Falk FK%sT 1985 Sep 15 522 -4:00 Falk FK%sT 523 524# French Guiana 525# Zone NAME GMTOFF RULES FORMAT [UNTIL] 526Zone America/Cayenne -3:29:20 - LMT 1911 Jul 527 -4:00 - GFT 1967 Oct # French Guiana Time 528 -3:00 - GFT 529 530# Guyana 531# Zone NAME GMTOFF RULES FORMAT [UNTIL] 532Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown 533 -3:45 - GBGT 1966 May 26 # Br Guiana Time 534 -3:45 - GYT 1975 Jul 31 # Guyana Time 535 -3:00 - GYT 1991 536# IATA SSIM (1996-06) says -4:00. Assume a 1991 switch. 537 -4:00 - GYT 538 539# Paraguay 540# From Paul Eggert (1999-10-29): 541# Shanks (1999) says that spring transitions are from 01:00 -> 02:00, 542# and autumn transitions are from 00:00 -> 23:00. Go with earlier 543# editions of Shanks, and with the IATA, who say transitions occur at 00:00. 544# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 545Rule Para 1975 1988 - Oct 1 0:00 1:00 S 546Rule Para 1975 1978 - Mar 1 0:00 0 - 547Rule Para 1979 1991 - Apr 1 0:00 0 - 548Rule Para 1989 only - Oct 22 0:00 1:00 S 549Rule Para 1990 only - Oct 1 0:00 1:00 S 550Rule Para 1991 only - Oct 6 0:00 1:00 S 551Rule Para 1992 only - Mar 1 0:00 0 - 552Rule Para 1992 only - Oct 5 0:00 1:00 S 553Rule Para 1993 only - Mar 31 0:00 0 - 554Rule Para 1993 1995 - Oct 1 0:00 1:00 S 555Rule Para 1994 1995 - Feb lastSun 0:00 0 - 556Rule Para 1996 only - Mar 1 0:00 0 - 557# IATA SSIM (1997-09) says Mar 1; go with Shanks. 558Rule Para 1997 only - Feb lastSun 0:00 0 - 559Rule Para 1998 only - Mar 1 0:00 0 - 560Rule Para 1996 1998 - Oct Sun>=1 0:00 1:00 S 561# IATA SSIM (1999-02) says lastSat, not lastSun; (1999-09) reports no date; 562# go with Shanks. 563Rule Para 1999 max - Feb lastSun 0:00 0 - 564# IATA SSIM (2000-02) says 1999-10-10. 565Rule Para 1999 max - Oct Sun>=8 0:00 1:00 S 566# Zone NAME GMTOFF RULES FORMAT [UNTIL] 567Zone America/Asuncion -3:50:40 - LMT 1890 568 -3:50:40 - AMT 1931 Oct 10 # Asuncion Mean Time 569 -4:00 - PYT 1972 Oct # Paraguay Time 570 -3:00 - PYT 1974 Apr 571 -4:00 Para PY%sT 572 573# Peru 574# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 575Rule Peru 1938 only - Jan 1 0:00 1:00 S 576Rule Peru 1938 only - Apr 1 0:00 0 - 577Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 S 578Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 - 579Rule Peru 1987 only - Jan 1 0:00 1:00 S 580Rule Peru 1987 only - Apr 1 0:00 0 - 581Rule Peru 1990 only - Jan 1 0:00 1:00 S 582Rule Peru 1990 only - Apr 1 0:00 0 - 583# IATA is ambiguous for 1993/1995; go with Shanks. 584Rule Peru 1994 only - Jan 1 0:00 1:00 S 585Rule Peru 1994 only - Apr 1 0:00 0 - 586# Zone NAME GMTOFF RULES FORMAT [UNTIL] 587Zone America/Lima -5:08:12 - LMT 1890 588 -5:09 - LMT 1908 Jul 28 # Lima Mean Time 589 -5:00 Peru PE%sT # Peru Time 590 591# South Georgia 592# Zone NAME GMTOFF RULES FORMAT [UNTIL] 593Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken 594 -2:00 - GST # South Georgia Time 595 596# South Sandwich Is 597# uninhabited; scientific personnel have wintered 598 599# Suriname 600# Zone NAME GMTOFF RULES FORMAT [UNTIL] 601Zone America/Paramaribo -3:40:40 - LMT 1911 602 -3:40:52 - PMT 1935 # Paramaribo Mean Time 603 -3:40:36 - PMT 1945 Oct # The capital moved? 604 -3:30 - NEGT 1975 Nov 20 # Dutch Guiana Time 605 -3:30 - SRT 1984 Oct # Suriname Time 606 -3:00 - SRT 607 608# Trinidad and Tobago 609# Zone NAME GMTOFF RULES FORMAT [UNTIL] 610Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2 611 -4:00 - AST 612 613# Uruguay 614# From Paul Eggert <eggert@twinsun.com> (1993-11-18): 615# Uruguay wins the prize for the strangest peacetime manipulation of the rules. 616# From Shanks: 617# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 618# Whitman gives 1923 Oct 1; go with Shanks. 619Rule Uruguay 1923 only - Oct 2 0:00 0:30 HS 620Rule Uruguay 1924 1926 - Apr 1 0:00 0 - 621Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS 622Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS 623# Shanks gives 1935 Apr 1 0:00 and 1936 Mar 30 0:00; go with Whitman. 624Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 - 625Rule Uruguay 1936 only - Nov 1 0:00 0:30 HS 626Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 - 627# Whitman gives 1937 Oct 3; go with Shanks. 628Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HS 629# Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13, 630# and 1943 Apr 13 ``to present time''; go with Shanks. 631Rule Uruguay 1941 only - Aug 1 0:00 0 - 632Rule Uruguay 1942 only - Jan 1 0:00 0:30 HS 633Rule Uruguay 1942 only - Dec 14 0:00 1:00 S 634Rule Uruguay 1943 only - Mar 14 0:00 0 - 635Rule Uruguay 1959 only - May 24 0:00 1:00 S 636Rule Uruguay 1959 only - Nov 15 0:00 0 - 637Rule Uruguay 1960 only - Jan 17 0:00 1:00 S 638Rule Uruguay 1960 only - Mar 6 0:00 0 - 639Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 S 640Rule Uruguay 1965 only - Sep 26 0:00 0 - 641Rule Uruguay 1966 1967 - Oct 31 0:00 0 - 642Rule Uruguay 1968 1970 - May 27 0:00 0:30 HS 643Rule Uruguay 1968 1970 - Dec 2 0:00 0 - 644Rule Uruguay 1972 only - Apr 24 0:00 1:00 S 645Rule Uruguay 1972 only - Aug 15 0:00 0 - 646Rule Uruguay 1974 only - Mar 10 0:00 0:30 HS 647Rule Uruguay 1974 only - Dec 22 0:00 1:00 S 648Rule Uruguay 1976 only - Oct 1 0:00 0 - 649Rule Uruguay 1977 only - Dec 4 0:00 1:00 S 650Rule Uruguay 1978 only - Apr 1 0:00 0 - 651Rule Uruguay 1979 only - Oct 1 0:00 1:00 S 652Rule Uruguay 1980 only - May 1 0:00 0 - 653Rule Uruguay 1987 only - Dec 14 0:00 1:00 S 654Rule Uruguay 1988 only - Mar 14 0:00 0 - 655Rule Uruguay 1988 only - Dec 11 0:00 1:00 S 656Rule Uruguay 1989 only - Mar 12 0:00 0 - 657Rule Uruguay 1989 only - Oct 29 0:00 1:00 S 658# Shanks says no DST was observed in 1990/1 and 1991/2, 659# and that 1992/3's DST was from 10-25 to 03-01. Go with IATA. 660Rule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 - 661Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S 662Rule Uruguay 1992 only - Oct 18 0:00 1:00 S 663Rule Uruguay 1993 only - Feb 28 0:00 0 - 664# Zone NAME GMTOFF RULES FORMAT [UNTIL] 665Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28 666 -3:44:44 - MMT 1920 May 1 # Montevideo MT 667 -3:30 Uruguay UY%sT 1942 Dec 14 # Uruguay Time 668 -3:00 Uruguay UY%sT 669 670# Venezuela 671# Zone NAME GMTOFF RULES FORMAT [UNTIL] 672Zone America/Caracas -4:27:44 - LMT 1890 673 -4:27:44 - CMT 1912 Feb 12 # Caracas Mean Time 674 -4:30 - VET 1965 # Venezuela Time 675 -4:00 - VET 676
