southamerica revision 43543
143543Swollman# @(#)southamerica 7.26 22742Swollman 32742Swollman# This data is by no means authoritative; if you think you know better, 42742Swollman# go ahead and edit the file (and please send any changes to 52742Swollman# tz@elsie.nci.nih.gov for general use in the future). 62742Swollman 720094Swollman# From Paul Eggert <eggert@twinsun.com> (1996-11-22): 82742Swollman# A good source for time zone historical data outside the U.S. is 943014Swollman# Thomas G. Shanks, The International Atlas (4th edition), 1043014Swollman# San Diego: ACS Publications, Inc. (1995). 112742Swollman# 1220094Swollman# Gwillim Law <LAW@encmail.encompass.com> writes that a good source 1320094Swollman# for recent time zone data is the International Air Transport 1420094Swollman# Association's Standard Schedules Information Manual (IATA SSIM), 1520094Swollman# published semiannually. Law sent in several helpful summaries 1620094Swollman# of the IATA's data after 1990. 1720094Swollman# 1820094Swollman# Except where otherwise noted, Shanks is the source for entries through 1990, 1920094Swollman# and IATA SSIM is the source for entries after 1990. 2020094Swollman# 2119878Swollman# The following abbreviations are used in this file. 222742Swollman# Corrections are welcome! 239908Swollman# std dst 249908Swollman# LMT Local Mean Time 259908Swollman# -2:00 FST FDT Fernando de Noronha 2619878Swollman# -3:00 EST EDT Eastern Brazil 279908Swollman# -4:00 WST WDT Western Brazil 2819878Swollman# -4:00 AST ADT Atlantic 2919878Swollman# -5:00 AST ADT Acre 302742Swollman# 3119878Swollman# Earlier editions of these tables used the North American style (e.g. ARST and 3219878Swollman# ARDT for Argentine Standard and Daylight Time), but the following quote 3319878Swollman# suggests that it's better to use European style (e.g. ART and ARST). 3419878Swollman# I suggest the use of _Summer time_ instead of the more cumbersome 3519878Swollman# _daylight-saving time_. _Summer time_ seems to be in general use 3619878Swollman# in Europe and South America. 3719878Swollman# -- E O Cutler, _New York Times_ (1937-02-14), quoted in 3819878Swollman# H L Mencken, _The American Language: Supplement I_ (1960), p 466 392742Swollman 4019878Swollman 412742Swollman# From Guy Harris: 422742Swollman# From Official Airline Guide - Worldwide Edition (1987). Countries not 432742Swollman# listed here do not observe DST, according to the OAG. Time zone names 442742Swollman# are pure inventions, and none are supplied for countries not observing 452742Swollman# DST; updates from natives would be appreciated. The times that DST 462742Swollman# starts and ends are based on the assumption that they switch a 2AM just 472742Swollman# as everybody else does. 482742Swollman 492742Swollman############################################################################### 502742Swollman 512742Swollman############################################################################### 522742Swollman 532742Swollman# Argentina 542742Swollman 5519878Swollman# From Bob Devine (1988-01-28): 562742Swollman# Argentina: first Sunday in October to first Sunday in April since 1976. 572742Swollman# Double Summer time from 1969 to 1974. Switches at midnight. 582742Swollman 5919878Swollman# From U. S. Naval Observatory (1988-01-199): 602742Swollman# ARGENTINA 3 H BEHIND UTC 612742Swollman 6219878Swollman# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26): 6321217Swollman# I am sending modifications to the Argentine time zone table... 649908Swollman# AR was chosen because they are the ISO letters that represent Argentina. 659908Swollman 662742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 6719878SwollmanRule Arg 1930 only - Dec 1 0:00 1:00 S 6819878SwollmanRule Arg 1931 only - Apr 1 0:00 0 - 6919878SwollmanRule Arg 1931 only - Oct 15 0:00 1:00 S 7019878SwollmanRule Arg 1932 1940 - Mar 1 0:00 0 - 7119878SwollmanRule Arg 1932 1939 - Nov 1 0:00 1:00 S 7219878SwollmanRule Arg 1940 only - Jul 1 0:00 1:00 S 7319878SwollmanRule Arg 1941 only - Jun 15 0:00 0 - 7419878SwollmanRule Arg 1941 only - Oct 15 0:00 1:00 S 7519878SwollmanRule Arg 1943 only - Aug 1 0:00 0 - 7619878SwollmanRule Arg 1943 only - Oct 15 0:00 1:00 S 7719878SwollmanRule Arg 1946 only - Mar 1 0:00 0 - 7819878SwollmanRule Arg 1946 only - Oct 1 0:00 1:00 S 7919878SwollmanRule Arg 1963 only - Oct 1 0:00 0 - 8019878SwollmanRule Arg 1963 only - Dec 15 0:00 1:00 S 8119878SwollmanRule Arg 1964 1966 - Mar 1 0:00 0 - 8219878SwollmanRule Arg 1964 1966 - Oct 15 0:00 1:00 S 8319878SwollmanRule Arg 1967 only - Apr 1 0:00 0 - 8419878SwollmanRule Arg 1967 1968 - Oct Sun<=7 0:00 1:00 S 8519878SwollmanRule Arg 1968 1969 - Apr Sun<=7 0:00 0 - 8619878SwollmanRule Arg 1974 only - Jan 23 0:00 1:00 S 8719878SwollmanRule Arg 1974 only - May 1 0:00 0 - 8819878SwollmanRule Arg 1974 1976 - Oct Sun<=7 0:00 1:00 S 8919878SwollmanRule Arg 1975 1977 - Apr Sun<=7 0:00 0 - 9019878SwollmanRule Arg 1985 only - Nov 2 0:00 1:00 S 9119878SwollmanRule Arg 1986 only - Mar 14 0:00 0 - 9219878SwollmanRule Arg 1986 1987 - Oct 25 0:00 1:00 S 9319878SwollmanRule Arg 1987 only - Feb 13 0:00 0 - 9419878SwollmanRule Arg 1988 only - Feb 7 0:00 0 - 9519878SwollmanRule Arg 1988 only - Dec 1 0:00 1:00 S 969908Swollman# 9719878Swollman# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26): 989908Swollman# These corrections were contributed by InterSoft Argentina S.A., 999908Swollman# obtaining the data from the: 1009908Swollman# Talleres de Hidrografia Naval Argentina 10121217Swollman# (Argentine Naval Hydrography Institute) 1029908Swollman# 1039908Swollman# Shanks gives 1989 Mar 16 and stops after 1990 Mar 4; go with Otero. 10419878SwollmanRule Arg 1989 1993 - Mar Sun>=1 0:00 0 - 10519878SwollmanRule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 S 1069908Swollman# 10719878Swollman# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26): 1089908Swollman# From this moment on, the law that mandated the daylight saving 1099908Swollman# time corrections was derogated and no more modifications 1109908Swollman# to the time zones (for daylight saving) are now made. 1119908Swollman# 1122742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11320094Swollman# 11420094Swollman# Buenos Aires (BA), Distrito Federal (DF), Santa Cruz (SC), 11520094Swollman# Tierra del Fuego (TF) & Antartida e Islas 1162742SwollmanZone America/Buenos_Aires -3:53:48 - LMT 1894 Nov 11719878Swollman -4:16:44 - CMT 1920 May # Cordoba Mean Time 11819878Swollman -4:00 - ART 1930 Dec 11919878Swollman -4:00 Arg AR%sT 1969 Oct 5 1209908Swollman -3:00 Arg AR%sT 12120094Swollman# 12220094Swollman# Santa Fe (SF), Entre Rios (ER), Corrientes (CN), Misiones (MN), Chaco (CC), 12320094Swollman# Formosa (FM), La Pampa (LP), Chubut (CH) 12420094SwollmanZone America/Rosario -4:02:40 - LMT 1894 Nov 12520094Swollman -4:16:44 - CMT 1920 May 12620094Swollman -4:00 - ART 1930 Dec 12720094Swollman -4:00 Arg AR%sT 1969 Oct 5 12820094Swollman -3:00 Arg AR%sT 1991 Jul 12920094Swollman -3:00 - ART 13020094Swollman# 13120094Swollman# Cordoba (CB), Santiago del Estero (SE), Salta (SA), Tucuman (TM), La Rioja (LR), San Juan (SJ), San Luis (SL), 13220094Swollman# Neuquen (NQ), Rio Negro (RN) 13320094SwollmanZone America/Cordoba -4:16:44 - LMT 1894 Nov 13420094Swollman -4:16:44 - CMT 1920 May 13520094Swollman -4:00 - ART 1930 Dec 13620094Swollman -4:00 Arg AR%sT 1969 Oct 5 13720094Swollman -3:00 Arg AR%sT 1990 Jul 13820094Swollman -3:00 - ART 13920094Swollman# 14020094Swollman# Jujuy (JY) 14120094SwollmanZone America/Jujuy -4:21:12 - LMT 1894 Nov 14220094Swollman -4:16:44 - CMT 1920 May 14320094Swollman -4:00 - ART 1930 Dec 14420094Swollman -4:00 Arg AR%sT 1969 Oct 5 14520094Swollman -3:00 Arg AR%sT 1991 Mar 3 14620094Swollman -4:00 - WART 1991 Oct 6 14720094Swollman -4:00 1:00 WARST 1992 Mar 15 14820094Swollman -4:00 - WART 1992 Oct 18 14920094Swollman -3:00 - ART 15020094Swollman# 15120094Swollman# Catamarca (CT) 15220094SwollmanZone America/Catamarca -4:23:08 - LMT 1894 Nov 15320094Swollman -4:16:44 - CMT 1920 May 15420094Swollman -4:00 - ART 1930 Dec 15520094Swollman -4:00 Arg AR%sT 1969 Oct 5 15620094Swollman -3:00 Arg AR%sT 1990 Jul 15720094Swollman -3:00 - ART 1991 Jul 15820094Swollman -3:00 Arg AR%sT 1992 Jul 15920094Swollman -3:00 - ART 16020094Swollman# 16120094Swollman# Mendoza (MZ) 16220094SwollmanZone America/Mendoza -4:35:16 - LMT 1894 Nov 16320094Swollman -4:16:44 - CMT 1920 May 16420094Swollman -4:00 - ART 1930 Dec 16520094Swollman -4:00 Arg AR%sT 1969 Oct 5 16620094Swollman -3:00 Arg AR%sT 1991 Mar 3 16720094Swollman -4:00 - WART 1991 Oct 15 16820094Swollman -4:00 1:00 WARST 1992 Mar 1 16920094Swollman -4:00 - WART 1992 Oct 18 17020094Swollman -3:00 - ART 1718029Swollman 17214343Swollman# Aruba 17314343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 17414343SwollmanZone America/Aruba -4:40:24 - LMT 1912 Feb 12 # Oranjestad 17519878Swollman -4:30 - ANT 1965 # Netherlands Antilles Time 17614343Swollman -4:00 - AST 17714343Swollman 1782742Swollman# Bolivia 1792742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1802742SwollmanZone America/La_Paz -4:32:36 - LMT 1890 18119878Swollman -4:32:36 - LPMT 1931 Oct 15 # La Paz Mean Time 18219878Swollman -4:32:36 1:00 BOST 1932 Mar 21 # Bolivia ST 18319878Swollman -4:00 - BOT # Bolivia Time 1842742Swollman 1852742Swollman# Brazil 1862742Swollman 18719878Swollman# From Paul Eggert <eggert@twinsun.com> (1993-11-18): 1882742Swollman# The mayor of Rio recently attempted to change the time zone rules 1892742Swollman# just in his city, in order to leave more summer time for the tourist trade. 1902742Swollman# The rule change lasted only part of the day; 1912742Swollman# the federal government refused to follow the city's rules, and business 1922742Swollman# was in a chaos, so the mayor backed down that afternoon. 1932742Swollman 19420094Swollman# From IATA SSIM (1996-02): 19520094Swollman# _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS), 19620094Swollman# Santa Catarina (SC), Parana (PR), Sao Paulo (SP), Rio de Janeiro (RJ), 19720094Swollman# Espirito Santo (ES), Minas Gerais (MG), Bahia (BA), Goias (GO), 19820094Swollman# Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL]. 19920094Swollman# [The last three states are new to this issue of the IATA SSIM.] 20020094Swollman 20120094Swollman# From Gwillim Law (1996-10-07): 20220094Swollman# Geography, history (Tocantins was part of Goias until 1989), and other 20320094Swollman# sources of time zone information lead me to believe that AL, SE, and TO were 20420094Swollman# always in BR1, and so the only change was whether or not they observed DST.... 20520094Swollman# The earliest issue of the SSIM I have is 2/91. Each issue from then until 20620094Swollman# 9/95 says that DST is observed only in the ten states I quoted from 9/95, 20720094Swollman# along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2 20820094Swollman# (UTC-4).... The other two time zones given for Brazil are BR3, which is 20920094Swollman# UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is 21020094Swollman# UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's 21120094Swollman# become part of the state of Pernambuco). The boundary between BR1 and BR2 21220094Swollman# has never been clearly stated. They've simply been called East and West. 21320094Swollman# However, some conclusions can be drawn from another IATA manual: the Airline 21420094Swollman# Coding Directory, which lists close to 400 airports in Brazil. For each 21520094Swollman# airport it gives a time zone which is coded to the SSIM. From that 21620094Swollman# information, I'm led to conclude that the states of Amapa (AP), Ceara (CE), 21720094Swollman# Maranhao (MA), Paraiba (PR), Pernambuco (PE), Piaui (PI), and Rio Grande do 21820094Swollman# Norte (RN), and the eastern part of Para (PA) are all in BR1 without DST. 21920094Swollman 22020094Swollman# From Paul Eggert (1996-11-22): 22120094Swollman# Let's make the following assumptions: 22220094Swollman# 22320094Swollman# * All data in Shanks are correct through 1990. In particular, 22420094Swollman# Shanks was right when he said Acre stopped observing DST in mid-1988. 22520094Swollman# * Areas where Shanks reports DST up to 1990, but the IATA reports no DST 22620094Swollman# in 1995, stopped observing DST in mid-1990. 22720094Swollman# 22820094Swollman# Under these assumptions Brazil needs 7 entries to cover all the distinct 22920094Swollman# time zone histories since 1970: 23020094Swollman# 23120094Swollman# Noronha (UTC-2), Fortaleza (UTC-3), and Manaus (UTC-4) stopped observing DST 23220094Swollman# in mid-1990. 23320094Swollman# Maceio (UTC-3) stopped observing DST in mid-1990, but started again mid-1995. 23420094Swollman# Sao Paulo (UTC-3) and Cuiaba (UTC-4) always observed DST. 23520094Swollman# Porto Acre (UTC-5) stopped observing DST in mid-1988. 23620094Swollman 23743014Swollman# From Rodrigo Feher <feher@pobox.com> (1998-01-17): 23843014Swollman# Reading "southamerica" file in timezone 7.55 I've found an 23943014Swollman# error. Line 193 say "Territory of Acre". It is not a territory anymore 24043014Swollman# but a state. 24143014Swollman 24243014Swollman# From Marcos Tadeu (1998-09-27): 24343014Swollman# <a href="http://pcdsh01.on.br/verao1.html"> 24443014Swollman# Brazilian official page 24543014Swollman# </a> 24643014Swollman# 24743014Swollman# From Paul Eggert (1998-09-28): 24843014Swollman# The official decrees referenced below are taken from 24943014Swollman# <a href="http://pcdsh01.on.br/DecHV.html"> 25043014Swollman# Decretos sobre o Horario de Verao no Brasil 25143014Swollman# </a> (1998-09-25, in Portuguese). 25243014Swollman 2532742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 25443543Swollman# Decree <a href="http://pcdsh01.on.br/HV20466.htm">20,466</a> (1931-10-01) 25543543Swollman# Decree <a href="http://pcdsh01.on.br/HV21896.htm">21,896</a> (1932-01-10) 25619878SwollmanRule Brazil 1931 only - Oct 3 11:00 1:00 D 2572742SwollmanRule Brazil 1932 1933 - Apr 1 0:00 0 S 25819878SwollmanRule Brazil 1932 only - Oct 3 0:00 1:00 D 25943543Swollman# Decree <a href="http://pcdsh01.on.br/HV23195.htm">23,195</a> (1933-10-10) 26043014Swollman# revoked DST. 26143543Swollman# Decree <a href="http://pcdsh01.on.br/HV27496.htm">27,496</a> (1949-11-24) 26243543Swollman# Decree <a href="http://pcdsh01.on.br/HV27998.htm">27,998</a> (1950-04-13) 26319878SwollmanRule Brazil 1949 1952 - Dec 1 0:00 1:00 D 26443543SwollmanRule Brazil 1950 only - Apr 16 1:00 0 S 26543543SwollmanRule Brazil 1951 1952 - Apr 1 0:00 0 S 26643543Swollman# Decree <a href="http://pcdsh01.on.br/HV32308.htm">32,308</a> (1953-02-24) 26743543SwollmanRule Brazil 1953 only - Mar 1 0:00 0 S 26843543Swollman# Decree <a href="http://pcdsh01.on.br/HV34724.htm">34,724</a> (1953-11-30) 26943014Swollman# revoked DST. 27043543Swollman# Decree <a href="http://pcdsh01.on.br/HV52700.htm">52,700</a> (1963-10-18) 27143543Swollman# established DST from 1963-10-23 00:00 to 1964-02-29 00:00 27243543Swollman# in SP, RJ, GB, MG, ES, due to the prolongation of the drought. 27343543Swollman# Decree <a href="http://pcdsh01.on.br/HV53071.htm">53,071</a> (1963-12-03) 27443543Swollman# extended the above decree to all of the national territory on 12-09. 27519878SwollmanRule Brazil 1963 only - Dec 9 0:00 1:00 D 27643543Swollman# Decree <a href="http://pcdsh01.on.br/HV53604.htm">53,604</a> (1964-02-25) 27743543Swollman# extended summer time by one day to 1964-03-01 00:00 (start of school). 2782742SwollmanRule Brazil 1964 only - Mar 1 0:00 0 S 27943543Swollman# Decree <a href="http://pcdsh01.on.br/HV55639.htm">55,639</a> (1965-01-27) 28019878SwollmanRule Brazil 1965 only - Jan 31 0:00 1:00 D 28143543SwollmanRule Brazil 1965 only - Mar 31 0:00 0 S 28243543Swollman# Decree <a href="http://pcdsh01.on.br/HV57303.htm">57,303</a> (1965-11-22) 28319878SwollmanRule Brazil 1965 only - Dec 1 0:00 1:00 D 28443543Swollman# Decree <a href="http://pcdsh01.on.br/HV57843.htm">57,843</a> (1966-02-18) 2852742SwollmanRule Brazil 1966 1968 - Mar 1 0:00 0 S 28619878SwollmanRule Brazil 1966 1967 - Nov 1 0:00 1:00 D 28743543Swollman# Decree <a href="http://pcdsh01.on.br/HV63429.htm">63,429</a> (1968-10-15) 28843543Swollman# revoked DST. 28943543Swollman# Decree <a href="http://pcdsh01.on.br/HV91698.htm">91,698</a> (1985-09-27) 29019878SwollmanRule Brazil 1985 only - Nov 2 0:00 1:00 D 29143543Swollman# Decree 92,310 (1986-01-21) 29243543Swollman# Decree 92,463 (1986-03-13) 2932742SwollmanRule Brazil 1986 only - Mar 15 0:00 0 S 29443543Swollman# Decree 93,316 (1986-10-01) 29543543SwollmanRule Brazil 1986 only - Oct 25 0:00 1:00 D 2962742SwollmanRule Brazil 1987 only - Feb 14 0:00 0 S 29743543Swollman# Decree <a href="http://pcdsh01.on.br/HV94922.htm">94,922</a> (1987-09-22) 29843543SwollmanRule Brazil 1987 only - Oct 25 0:00 1:00 D 2992742SwollmanRule Brazil 1988 only - Feb 7 0:00 0 S 30043543Swollman# Decree <a href="http://pcdsh01.on.br/HV96676.htm">96,676</a> (1988-09-12) 30143543Swollman# except for the states of AC, AM, PA, RR, RO, and AP (then a territory) 30243543SwollmanRule Brazil 1988 only - Oct 16 0:00 1:00 D 30343543SwollmanRule Brazil 1989 only - Jan 29 0:00 0 S 30443543Swollman# Decree <a href="http://pcdsh01.on.br/HV98077.htm">98,077</a> (1989-08-21) 30543543Swollman# with the same exceptions 30643543SwollmanRule Brazil 1989 only - Oct 15 0:00 1:00 D 30743543SwollmanRule Brazil 1990 only - Feb 11 0:00 0 S 30843543Swollman# Decree <a href="http://pcdsh01.on.br/HV99530.htm">99,530</a> (1990-09-17) 30943543Swollman# adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF. 31043543Swollman# Decree 99,629 (1990-10-19) adds BA, MT. 31143543SwollmanRule Brazil 1990 only - Oct 21 0:00 1:00 D 31243543SwollmanRule Brazil 1991 only - Feb 17 0:00 0 S 31343543Swollman# <a href="http://pcdsh01.on.br/HV1991.htm">Unnumbered decree</a> (1991-09-25) 31443543Swollman# adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF. 31543543SwollmanRule Brazil 1991 only - Oct 20 0:00 1:00 D 31620094SwollmanRule Brazil 1992 only - Feb 9 0:00 0 S 31743543Swollman# <a href="http://pcdsh01.on.br/HV1992.htm">Unnumbered decree</a> (1992-10-16) 31843543Swollman# adopted by same states. 31943543SwollmanRule Brazil 1992 only - Oct 25 0:00 1:00 D 32043543SwollmanRule Brazil 1993 only - Jan 31 0:00 0 S 32143014Swollman# Decree <a href="http://pcdsh01.on.br/HV942.htm">942</a> (1993-09-28) 32243543Swollman# adopted by same states, plus AM. 32343543Swollman# Decree <a href="http://pcdsh01.on.br/HV1252.htm">1,252</a> (1994-09-22) 32443543Swollman# adopted by same states, minus AM. 32543543Swollman# Decree <a href="http://pcdsh01.on.br/HV1636.htm">1,636</a> (1995-09-14) 32643543Swollman# adopted by same states, plus TO. 32743543Swollman# Decree <a href="http://pcdsh01.on.br/HV1674.htm">1,674</a> (1995-10-13) 32843543Swollman# adds AL, SE. 32930711SwollmanRule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 D 33020094SwollmanRule Brazil 1994 1995 - Feb Sun>=15 0:00 0 S 33143543SwollmanRule Brazil 1996 only - Feb 11 0:00 0 S 33243543Swollman# Decree <a href="http://pcdsh01.on.br/HV2000.htm">2,000</a> (1996-09-04) 33343543Swollman# adopted by same states, minus AL, SE. 33443543SwollmanRule Brazil 1996 only - Oct 6 0:00 1:00 D 33543543SwollmanRule Brazil 1997 only - Feb 16 0:00 0 S 33643014Swollman# From Daniel C. Sobral <dcs@gns.com.br> (1998-02-12): 33743014Swollman# In 1997, the DS began on October 6. The stated reason was that 33843014Swollman# because international television networks ignored Brazil's policy on DS, 33943014Swollman# they bought the wrong times on satellite for coverage of Pope's visit. 34043014Swollman# This year, the ending date of DS was postponed to March 1 34143014Swollman# to help dealing with the shortages of electric power. 34243014Swollman# 34343014Swollman# From Paul Eggert (1998-02-25): 34443014Swollman# <a href="http://churchnet.ucsm.ac.uk/news/files2/news165.htm"> 34543014Swollman# Brazil Prepares for Papal Visit 34643014Swollman# </a>, 34743014Swollman# Church Net UK (1997-10-02). 34843014Swollman# 34943543Swollman# Decree 2,317 (1997-09-04), adopted by same states. 35043014SwollmanRule Brazil 1997 only - Oct 6 0:00 1:00 D 35143543Swollman# Decree <a href="http://pcdsh01.on.br/figuras/HV2495.JPG">2,495</a> 35243014Swollman# (1998-02-10) 35343014SwollmanRule Brazil 1998 only - Mar 1 0:00 0 S 35443543Swollman# Decree <a href="http://pcdsh01.on.br/figuras/Hv98.jpg">2,780</a> (1998-09-11) 35543543Swollman# adopted by the same states as before, 35643014Swollman# specifies only the 1998-10-11 and 1999-02-21 transitions; 35743014Swollman# after that, these rules are guesses and are quite possibly wrong, 35843014Swollman# but they are more likely than no DST at all. 35943543SwollmanRule Brazil 1998 max - Oct Sun>=8 0:00 1:00 D 36043014SwollmanRule Brazil 1999 max - Feb Sun>=15 0:00 0 S 36120094Swollman 36243014Swollman 3632742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 36420094Swollman# 36520094Swollman# Fernando de Noronha 3662742SwollmanZone America/Noronha -2:09:40 - LMT 1914 36720094Swollman -2:00 Brazil F%sT 1990 Jul 36820094Swollman -2:00 - FST 36920094Swollman# 37043543Swollman# Amapa, east Para 37143543SwollmanZone America/Belem -3:13:56 - LMT 1914 37243543Swollman -3:00 Brazil E%sT 1988 Jul 37343543Swollman -3:00 - EST 37443543Swollman# 37543543Swollman# Maranhao, Piaui, Ceara, Rio Grande do Norte, Paraiba, 37620094Swollman# Pernambuco (except Fernando de Noronha) 37720094SwollmanZone America/Fortaleza -2:34:00 - LMT 1914 37820094Swollman -3:00 Brazil E%sT 1990 Jul 37920094Swollman -3:00 - EST 38020094Swollman# 38143543Swollman# Tocantins 38243543SwollmanZone America/Araguaina -3:12:48 - LMT 1914 38320094Swollman -3:00 Brazil E%sT 1990 Jul 38420094Swollman -3:00 - EST 1995 Jul 38520094Swollman -3:00 Brazil E%sT 38620094Swollman# 38743543Swollman# Alagoas, Sergipe 38843543SwollmanZone America/Maceio -2:22:52 - LMT 1914 38943543Swollman -3:00 Brazil E%sT 1990 Jul 39043543Swollman -3:00 - EST 1995 Jul 39143543Swollman -3:00 Brazil E%sT 1996 Jul 39243543Swollman -3:00 - EST 39343543Swollman# 39420094Swollman# Bahia, Goias, Distrito Federal, Minas Gerais, Espirito Santo, Rio de Janeiro, 39520094Swollman# Sao Paulo, Parana, Santa Catarina, Rio Grande do Sul 3962742SwollmanZone America/Sao_Paulo -3:06:28 - LMT 1914 39743543Swollman -3:00 Brazil E%sT 1963 Oct 23 00:00 39843543Swollman -3:00 - EDT 1964 3992742Swollman -3:00 Brazil E%sT 40020094Swollman# 40120094Swollman# Mato Grosso, Mato Grosso do Sul 40220094SwollmanZone America/Cuiaba -3:44:20 - LMT 1914 40343543Swollman -4:00 Brazil W%sT 1990 Jul 40443543Swollman -4:00 - WST 40520094Swollman# 40643543Swollman# Roraima, west Para, Rondonia 40743543SwollmanZone America/Porto_Velho -4:15:36 - LMT 1914 40843543Swollman -4:00 Brazil W%sT 1988 Jul 40943543Swollman -4:00 - WST 41043543Swollman# 41143543Swollman# Amazonas 4122742SwollmanZone America/Manaus -4:00:04 - LMT 1914 41343543Swollman -4:00 Brazil W%sT 1988 Jul 41443543Swollman -4:00 - WST 1993 Jul 41543543Swollman -4:00 Brazil W%sT 1994 Jul 41620094Swollman -4:00 - WST 41720094Swollman# 41820094Swollman# Acre 4192742Swollman# Rio_Branco is too ambiguous, since there's a Rio Branco in Uruguay too. 4202742SwollmanZone America/Porto_Acre -4:31:12 - LMT 1914 42120094Swollman -5:00 Brazil A%sT 1988 Jul 42220094Swollman -5:00 - AST 4232742Swollman# 4242742Swollman# Martin Vaz and Trinidade are like America/Noronha. 4252742Swollman 4262742Swollman 4272742Swollman# Chile 4282742Swollman 42914343Swollman# From Eduardo Krell (1995-10-19): 43014343Swollman# The law says to switch to DST at midnight [24:00] on the second SATURDAY 43114343Swollman# of October.... The law is the same for March and October. 43243014Swollman# (1998-09-29): 43343014Swollman# Because of the drought this year, the government decided to go into 43443014Swollman# DST earlier (saturday 9/26 at 24:00). This is a one-time change only ... 43543014Swollman# (unless there's another dry season next year, I guess). 4362742Swollman 4372742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 43819878SwollmanRule Chile 1918 only - Sep 1 0:00 1:00 S 43919878SwollmanRule Chile 1919 only - Jul 2 0:00 0 - 44019878SwollmanRule Chile 1927 1931 - Sep 1 0:00 1:00 S 44119878SwollmanRule Chile 1928 1932 - Apr 1 0:00 0 - 44243014SwollmanRule Chile 1969 1997 - Oct Sun>=9 0:00 1:00 S 44319878SwollmanRule Chile 1970 max - Mar Sun>=9 0:00 0 - 44443014SwollmanRule Chile 1998 only - Sep 27 0:00 1:00 S 44543014SwollmanRule Chile 1999 max - Oct Sun>=9 0:00 1:00 S 44620094Swollman# IATA SSIM anomalies: (1990-09) says 1990-09-16; (1992-02) says 1992-03-14; 44720094Swollman# (1996-09) says 1998-03-08. Ignore these for now. 4482742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 4492742SwollmanZone America/Santiago -4:42:40 - LMT 1890 45019878Swollman -4:42:40 - SMT 1910 # Santiago Mean Time 45119878Swollman -5:00 Chile CL%sT 1932 Sep # Chile Time 45219878Swollman -4:00 Chile CL%sT 4532742SwollmanZone Pacific/Easter -7:17:28 - LMT 1890 # Mataveri 45419878Swollman -7:17:28 - MMT 1932 Sep # Mataveri Mean Time 45519878Swollman -7:00 Chile EAS%sT 1982 Mar 14 # Easter I Time 45619878Swollman -6:00 Chile EAS%sT 4572742Swollman# 4582742Swollman# Whitman says Juan Fernandez Is are like America/Santiago. 4592742Swollman# San Ambrosio, San Felix 4602742Swollman# no information; probably like America/Santiago 4612742Swollman 4622742Swollman 4632742Swollman# Colombia 46420094Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 46520094SwollmanRule CO 1992 only - May 2 0:00 1:00 S 46643014Swollman# Shanks (1995) estimates 1993-04-03 24:00 for this; go with IATA. 46720094SwollmanRule CO 1992 only - Dec 31 0:00 0 - 4682742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 4692742SwollmanZone America/Bogota -4:56:20 - LMT 1884 Mar 13 47019878Swollman -4:56:20 - BMT 1914 Nov 23 # Bogota Mean Time 47120094Swollman -5:00 CO CO%sT # Colombia Time 4722742Swollman# Malpelo, Providencia, San Andres 4732742Swollman# no information; probably like America/Bogota 4742742Swollman 4752742Swollman# Curacao 47643014Swollman# Shanks (1995) says that Bottom and Oranjestad have been at -4:00 since 47743014Swollman# standard time was introduced on 1912-03-02; and that Kralendijk and Rincon 47843014Swollman# used Kralendijk Mean Time (-4:33:08) from 1912-02-02 to 1965-01-01. 47943014Swollman# This all predates our 1970 cutoff, though. 4802742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 4812742SwollmanZone America/Curacao -4:35:44 - LMT 1912 Feb 12 # Willemstad 48219878Swollman -4:30 - ANT 1965 # Netherlands Antilles Time 4832742Swollman -4:00 - AST 4842742Swollman 4852742Swollman# Ecuador 4862742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 4872742SwollmanZone America/Guayaquil -5:19:20 - LMT 1890 48819878Swollman -5:14:00 - QMT 1931 # Quito Mean Time 48919878Swollman -5:00 - ECT # Ecuador Time 4902742SwollmanZone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno 49119878Swollman -5:00 - ECT 1986 49219878Swollman -6:00 - GALT # Galapagos Time 4932742Swollman 4942742Swollman# Falklands 4952742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 49619878SwollmanRule Falk 1937 1938 - Sep lastSun 0:00 1:00 S 49719878SwollmanRule Falk 1938 1942 - Mar Sun>=19 0:00 0 - 49819878SwollmanRule Falk 1939 only - Oct 1 0:00 1:00 S 49919878SwollmanRule Falk 1940 1942 - Sep lastSun 0:00 1:00 S 50019878SwollmanRule Falk 1943 only - Jan 1 0:00 0 - 50119878SwollmanRule Falk 1983 only - Sep lastSun 0:00 1:00 S 50219878SwollmanRule Falk 1984 1985 - Apr lastSun 0:00 0 - 50319878SwollmanRule Falk 1984 only - Sep 16 0:00 1:00 S 50420094SwollmanRule Falk 1985 1995 - Sep Sun>=9 0:00 1:00 S 50519878SwollmanRule Falk 1986 max - Apr Sun>=16 0:00 0 - 50620094SwollmanRule Falk 1996 max - Sep Sun>=8 0:00 1:00 S 5072742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 5082742SwollmanZone Atlantic/Stanley -3:51:24 - LMT 1890 50919878Swollman -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time 51019878Swollman -4:00 Falk FK%sT 1983 May # Falkland Is Time 51119878Swollman -3:00 Falk FK%sT 1985 Sep 15 51219878Swollman -4:00 Falk FK%sT 5132742Swollman 5142742Swollman# French Guiana 5152742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 5162742SwollmanZone America/Cayenne -3:29:20 - LMT 1911 Jul 51719878Swollman -4:00 - GFT 1967 Oct # French Guiana Time 51819878Swollman -3:00 - GFT 5192742Swollman 5202742Swollman# Guyana 5212742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 5222742SwollmanZone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown 52319878Swollman -3:45 - GBGT 1966 May 26 # Br Guiana Time 52419878Swollman -3:45 - GYT 1975 Jul 31 # Guyana Time 52520094Swollman -3:00 - GYT 1991 52620094Swollman# IATA SSIM (1996-06) says -4:00. Assume a 1991 switch. 52720094Swollman -4:00 - GYT 5282742Swollman 5292742Swollman# Paraguay 5302742Swollman 53119878Swollman# From Bob Devine (1988-01-28): 5322742Swollman# Paraguay: First day in October to last in March. Midnight switch?? 5332742Swollman# Since 1980. 5342742Swollman 53519878Swollman# From U. S. Naval Observatory (1989-01-19): 5362742Swollman# PARAGUAY 4 H BEHIND UTC 5372742Swollman# PARAGUAY 3 H BEHIND UTC OCT 1, '88-MAR 31, '89 5382742Swollman 5392742Swollman# From Shanks (1991): 5402742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 54119878SwollmanRule Para 1975 1978 - Oct 1 0:00 1:00 S 54219878SwollmanRule Para 1975 1978 - Mar 1 0:00 0 - 5432742Swollman# Shanks says 1979 was all DST. 54420094SwollmanRule Para 1980 1991 - Apr 1 0:00 0 - 54519878SwollmanRule Para 1980 1988 - Oct 1 0:00 1:00 S 54619878SwollmanRule Para 1989 only - Oct 22 0:00 1:00 S 54720094SwollmanRule Para 1990 only - Oct 1 0:00 1:00 S 54820094SwollmanRule Para 1991 only - Oct 6 0:00 1:00 S 54920094SwollmanRule Para 1992 only - Mar 1 0:00 0 - 55020094SwollmanRule Para 1992 only - Oct 5 0:00 1:00 S 55120094SwollmanRule Para 1993 only - Mar 31 0:00 0 - 55230711SwollmanRule Para 1993 1995 - Oct 1 0:00 1:00 S 55320094SwollmanRule Para 1994 1995 - Feb lastSun 0:00 0 - 55443014SwollmanRule Para 1996 1998 - Mar 1 0:00 0 - 55543014SwollmanRule Para 1996 max - Oct Sun>=1 0:00 1:00 S 55643014SwollmanRule Para 1999 max - Feb lastSun 0:00 0 - 5572742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 5582742SwollmanZone America/Asuncion -3:50:40 - LMT 1890 55919878Swollman -3:50:40 - AMT 1931 Oct 10 # Asuncion Mean Time 56019878Swollman -4:00 - PYT 1972 Oct # Paraguay Time 56119878Swollman -3:00 - PYT 1974 Apr 56219878Swollman -4:00 Para PY%sT 5632742Swollman 5642742Swollman# Peru 5652742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 56619878SwollmanRule Peru 1938 only - Jan 1 0:00 1:00 S 56719878SwollmanRule Peru 1938 only - Apr 1 0:00 0 - 56819878SwollmanRule Peru 1938 1939 - Sep lastSun 0:00 1:00 S 56919878SwollmanRule Peru 1939 1940 - Mar Sun>=24 0:00 0 - 57019878SwollmanRule Peru 1987 only - Jan 1 0:00 1:00 S 57119878SwollmanRule Peru 1987 only - Apr 1 0:00 0 - 57219878SwollmanRule Peru 1990 only - Jan 1 0:00 1:00 S 57319878SwollmanRule Peru 1990 only - Apr 1 0:00 0 - 57420094SwollmanRule Peru 1993 only - Jan 1 0:00 1:00 S 57520094SwollmanRule Peru 1993 only - Apr 1 0:00 0 - 5762742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 5772742SwollmanZone America/Lima -5:08:12 - LMT 1890 57819878Swollman -5:09 - LMT 1908 Jul 28 # Lima Mean Time 57919878Swollman -5:00 Peru PE%sT # Peru Time 5802742Swollman 5812742Swollman# South Georgia 5822742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 5832742SwollmanZone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken 58419878Swollman -2:00 - GST # South Georgia Time 5852742Swollman 5862742Swollman# South Sandwich Is 58714343Swollman# uninhabited 5882742Swollman 5892742Swollman# Suriname 5902742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 5912742SwollmanZone America/Paramaribo -3:40:40 - LMT 1911 5922742Swollman -3:40:52 - PMT 1935 # Paramaribo Mean Time 5932742Swollman -3:40:36 - PMT 1945 Oct # The capital moved? 59419878Swollman -3:30 - NEGT 1975 Nov 20 # Dutch Guiana Time 59519878Swollman -3:30 - SRT 1984 Oct # Suriname Time 59619878Swollman -3:00 - SRT 5972742Swollman 5982742Swollman# Trinidad and Tobago 5992742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 6002742SwollmanZone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2 6012742Swollman -4:00 - AST 6022742Swollman 6032742Swollman# Uruguay 60419878Swollman# From Paul Eggert <eggert@twinsun.com> (1993-11-18): 6052742Swollman# Uruguay wins the prize for the strangest peacetime manipulation of the rules. 6062742Swollman# From Shanks (1991): 6072742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 6082742Swollman# Whitman gives 1923 Oct 1; go with Shanks. 60919878SwollmanRule Uruguay 1923 only - Oct 2 0:00 0:30 HS 61019878SwollmanRule Uruguay 1924 1926 - Apr 1 0:00 0 - 61119878SwollmanRule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS 61219878SwollmanRule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS 6132742Swollman# Shanks gives 1935 Apr 1 0:00 and 1936 Mar 30 0:00; go with Whitman. 61419878SwollmanRule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 - 61519878SwollmanRule Uruguay 1936 only - Nov 1 0:00 0:30 HS 61619878SwollmanRule Uruguay 1937 1941 - Mar lastSun 0:00 0 - 6172742Swollman# Whitman gives 1937 Oct 3; go with Shanks. 61819878SwollmanRule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HS 6192742Swollman# Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13, 6202742Swollman# and 1943 Apr 13 ``to present time''; go with Shanks. 62119878SwollmanRule Uruguay 1941 only - Aug 1 0:00 0 - 62219878SwollmanRule Uruguay 1942 only - Jan 1 0:00 0:30 HS 62319878SwollmanRule Uruguay 1942 only - Dec 14 0:00 1:00 S 62419878SwollmanRule Uruguay 1943 only - Mar 14 0:00 0 - 62519878SwollmanRule Uruguay 1959 only - May 24 0:00 1:00 S 62619878SwollmanRule Uruguay 1959 only - Nov 15 0:00 0 - 62719878SwollmanRule Uruguay 1960 only - Jan 17 0:00 1:00 S 62819878SwollmanRule Uruguay 1960 only - Mar 6 0:00 0 - 62919878SwollmanRule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 S 63019878SwollmanRule Uruguay 1965 only - Sep 26 0:00 0 - 63119878SwollmanRule Uruguay 1966 1967 - Oct 31 0:00 0 - 63219878SwollmanRule Uruguay 1968 1970 - May 27 0:00 0:30 HS 63319878SwollmanRule Uruguay 1968 1970 - Dec 2 0:00 0 - 63419878SwollmanRule Uruguay 1972 only - Apr 24 0:00 1:00 S 63519878SwollmanRule Uruguay 1972 only - Aug 15 0:00 0 - 63619878SwollmanRule Uruguay 1974 only - Mar 10 0:00 0:30 HS 63719878SwollmanRule Uruguay 1974 only - Dec 22 0:00 1:00 S 63819878SwollmanRule Uruguay 1976 only - Oct 1 0:00 0 - 63919878SwollmanRule Uruguay 1977 only - Dec 4 0:00 1:00 S 64019878SwollmanRule Uruguay 1978 only - Apr 1 0:00 0 - 64119878SwollmanRule Uruguay 1979 only - Oct 1 0:00 1:00 S 64219878SwollmanRule Uruguay 1980 only - May 1 0:00 0 - 64319878SwollmanRule Uruguay 1987 only - Dec 14 0:00 1:00 S 64419878SwollmanRule Uruguay 1988 only - Mar 14 0:00 0 - 64519878SwollmanRule Uruguay 1988 only - Dec 11 0:00 1:00 S 64619878SwollmanRule Uruguay 1989 only - Mar 12 0:00 0 - 64719878SwollmanRule Uruguay 1989 only - Oct 29 0:00 1:00 S 64820094SwollmanRule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 - 64920094SwollmanRule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S 65030711Swollman# Shanks's 4th edition (1995) says no DST was observed in 1990/1 and 1991/2, 65130711Swollman# and that 1992/3's DST was from 10-25 to 03-01. Go with IATA. 65230711SwollmanRule Uruguay 1992 only - Oct 18 0:00 1:00 S 65320094SwollmanRule Uruguay 1993 only - Feb 28 0:00 0 - 6542742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 6552742SwollmanZone America/Montevideo -3:44:44 - LMT 1898 Jun 28 65619878Swollman -3:44:44 - MMT 1920 May 1 # Montevideo MT 65719878Swollman -3:30 Uruguay UY%sT 1942 Dec 14 # Uruguay Time 65819878Swollman -3:00 Uruguay UY%sT 6592742Swollman 6602742Swollman# Venezuela 6612742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 6622742SwollmanZone America/Caracas -4:27:44 - LMT 1890 66319878Swollman -4:27:44 - CMT 1912 Feb 12 # Caracas Mean Time 66419878Swollman -4:30 - VET 1965 # Venezuela Time 66519878Swollman -4:00 - VET 666