southamerica revision 21217
121217Swollman# @(#)southamerica 7.16 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 92742Swollman# Thomas G. Shanks, The International Atlas (3rd edition), 102742Swollman# San Diego: ACS Publications, Inc. (1991). 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# See the `africa' file for time zone naming and abbreviation conventions. 3219878Swollman# Earlier editions of these tables used the North American style (e.g. ARST and 3319878Swollman# ARDT for Argentine Standard and Daylight Time), but the following quote 3419878Swollman# suggests that it's better to use European style (e.g. ART and ARST). 3519878Swollman# I suggest the use of _Summer time_ instead of the more cumbersome 3619878Swollman# _daylight-saving time_. _Summer time_ seems to be in general use 3719878Swollman# in Europe and South America. 3819878Swollman# -- E O Cutler, _New York Times_ (1937-02-14), quoted in 3919878Swollman# H L Mencken, _The American Language: Supplement I_ (1960), p 466 402742Swollman 4119878Swollman 422742Swollman# From Guy Harris: 432742Swollman# From Official Airline Guide - Worldwide Edition (1987). Countries not 442742Swollman# listed here do not observe DST, according to the OAG. Time zone names 452742Swollman# are pure inventions, and none are supplied for countries not observing 462742Swollman# DST; updates from natives would be appreciated. The times that DST 472742Swollman# starts and ends are based on the assumption that they switch a 2AM just 482742Swollman# as everybody else does. 492742Swollman 502742Swollman############################################################################### 512742Swollman 522742Swollman############################################################################### 532742Swollman 542742Swollman# Argentina 552742Swollman 5619878Swollman# From Bob Devine (1988-01-28): 572742Swollman# Argentina: first Sunday in October to first Sunday in April since 1976. 582742Swollman# Double Summer time from 1969 to 1974. Switches at midnight. 592742Swollman 6019878Swollman# From U. S. Naval Observatory (1988-01-199): 612742Swollman# ARGENTINA 3 H BEHIND UTC 622742Swollman 6319878Swollman# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26): 6421217Swollman# I am sending modifications to the Argentine time zone table... 659908Swollman# AR was chosen because they are the ISO letters that represent Argentina. 669908Swollman 672742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 6819878SwollmanRule Arg 1930 only - Dec 1 0:00 1:00 S 6919878SwollmanRule Arg 1931 only - Apr 1 0:00 0 - 7019878SwollmanRule Arg 1931 only - Oct 15 0:00 1:00 S 7119878SwollmanRule Arg 1932 1940 - Mar 1 0:00 0 - 7219878SwollmanRule Arg 1932 1939 - Nov 1 0:00 1:00 S 7319878SwollmanRule Arg 1940 only - Jul 1 0:00 1:00 S 7419878SwollmanRule Arg 1941 only - Jun 15 0:00 0 - 7519878SwollmanRule Arg 1941 only - Oct 15 0:00 1:00 S 7619878SwollmanRule Arg 1943 only - Aug 1 0:00 0 - 7719878SwollmanRule Arg 1943 only - Oct 15 0:00 1:00 S 7819878SwollmanRule Arg 1946 only - Mar 1 0:00 0 - 7919878SwollmanRule Arg 1946 only - Oct 1 0:00 1:00 S 8019878SwollmanRule Arg 1963 only - Oct 1 0:00 0 - 8119878SwollmanRule Arg 1963 only - Dec 15 0:00 1:00 S 8219878SwollmanRule Arg 1964 1966 - Mar 1 0:00 0 - 8319878SwollmanRule Arg 1964 1966 - Oct 15 0:00 1:00 S 8419878SwollmanRule Arg 1967 only - Apr 1 0:00 0 - 8519878SwollmanRule Arg 1967 1968 - Oct Sun<=7 0:00 1:00 S 8619878SwollmanRule Arg 1968 1969 - Apr Sun<=7 0:00 0 - 8719878SwollmanRule Arg 1974 only - Jan 23 0:00 1:00 S 8819878SwollmanRule Arg 1974 only - May 1 0:00 0 - 8919878SwollmanRule Arg 1974 1976 - Oct Sun<=7 0:00 1:00 S 9019878SwollmanRule Arg 1975 1977 - Apr Sun<=7 0:00 0 - 9119878SwollmanRule Arg 1985 only - Nov 2 0:00 1:00 S 9219878SwollmanRule Arg 1986 only - Mar 14 0:00 0 - 9319878SwollmanRule Arg 1986 1987 - Oct 25 0:00 1:00 S 9419878SwollmanRule Arg 1987 only - Feb 13 0:00 0 - 9519878SwollmanRule Arg 1988 only - Feb 7 0:00 0 - 9619878SwollmanRule Arg 1988 only - Dec 1 0:00 1:00 S 979908Swollman# 9819878Swollman# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26): 999908Swollman# These corrections were contributed by InterSoft Argentina S.A., 1009908Swollman# obtaining the data from the: 1019908Swollman# Talleres de Hidrografia Naval Argentina 10221217Swollman# (Argentine Naval Hydrography Institute) 1039908Swollman# 1049908Swollman# Shanks gives 1989 Mar 16 and stops after 1990 Mar 4; go with Otero. 10519878SwollmanRule Arg 1989 1993 - Mar Sun>=1 0:00 0 - 10619878SwollmanRule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 S 1079908Swollman# 10819878Swollman# From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26): 1099908Swollman# From this moment on, the law that mandated the daylight saving 1109908Swollman# time corrections was derogated and no more modifications 1119908Swollman# to the time zones (for daylight saving) are now made. 1129908Swollman# 1132742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 11420094Swollman# 11520094Swollman# Buenos Aires (BA), Distrito Federal (DF), Santa Cruz (SC), 11620094Swollman# Tierra del Fuego (TF) & Antartida e Islas 1172742SwollmanZone America/Buenos_Aires -3:53:48 - LMT 1894 Nov 11819878Swollman -4:16:44 - CMT 1920 May # Cordoba Mean Time 11919878Swollman -4:00 - ART 1930 Dec 12019878Swollman -4:00 Arg AR%sT 1969 Oct 5 1219908Swollman -3:00 Arg AR%sT 12220094Swollman# 12320094Swollman# Santa Fe (SF), Entre Rios (ER), Corrientes (CN), Misiones (MN), Chaco (CC), 12420094Swollman# Formosa (FM), La Pampa (LP), Chubut (CH) 12520094SwollmanZone America/Rosario -4:02:40 - LMT 1894 Nov 12620094Swollman -4:16:44 - CMT 1920 May 12720094Swollman -4:00 - ART 1930 Dec 12820094Swollman -4:00 Arg AR%sT 1969 Oct 5 12920094Swollman -3:00 Arg AR%sT 1991 Jul 13020094Swollman -3:00 - ART 13120094Swollman# 13220094Swollman# Cordoba (CB), Santiago del Estero (SE), Salta (SA), Tucuman (TM), La Rioja (LR), San Juan (SJ), San Luis (SL), 13320094Swollman# Neuquen (NQ), Rio Negro (RN) 13420094SwollmanZone America/Cordoba -4:16:44 - LMT 1894 Nov 13520094Swollman -4:16:44 - CMT 1920 May 13620094Swollman -4:00 - ART 1930 Dec 13720094Swollman -4:00 Arg AR%sT 1969 Oct 5 13820094Swollman -3:00 Arg AR%sT 1990 Jul 13920094Swollman -3:00 - ART 14020094Swollman# 14120094Swollman# Jujuy (JY) 14220094SwollmanZone America/Jujuy -4:21:12 - LMT 1894 Nov 14320094Swollman -4:16:44 - CMT 1920 May 14420094Swollman -4:00 - ART 1930 Dec 14520094Swollman -4:00 Arg AR%sT 1969 Oct 5 14620094Swollman -3:00 Arg AR%sT 1991 Mar 3 14720094Swollman -4:00 - WART 1991 Oct 6 14820094Swollman -4:00 1:00 WARST 1992 Mar 15 14920094Swollman -4:00 - WART 1992 Oct 18 15020094Swollman -3:00 - ART 15120094Swollman# 15220094Swollman# Catamarca (CT) 15320094SwollmanZone America/Catamarca -4:23:08 - LMT 1894 Nov 15420094Swollman -4:16:44 - CMT 1920 May 15520094Swollman -4:00 - ART 1930 Dec 15620094Swollman -4:00 Arg AR%sT 1969 Oct 5 15720094Swollman -3:00 Arg AR%sT 1990 Jul 15820094Swollman -3:00 - ART 1991 Jul 15920094Swollman -3:00 Arg AR%sT 1992 Jul 16020094Swollman -3:00 - ART 16120094Swollman# 16220094Swollman# Mendoza (MZ) 16320094SwollmanZone America/Mendoza -4:35:16 - LMT 1894 Nov 16420094Swollman -4:16:44 - CMT 1920 May 16520094Swollman -4:00 - ART 1930 Dec 16620094Swollman -4:00 Arg AR%sT 1969 Oct 5 16720094Swollman -3:00 Arg AR%sT 1991 Mar 3 16820094Swollman -4:00 - WART 1991 Oct 15 16920094Swollman -4:00 1:00 WARST 1992 Mar 1 17020094Swollman -4:00 - WART 1992 Oct 18 17120094Swollman -3:00 - ART 1728029Swollman 17314343Swollman# Aruba 17414343Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 17514343SwollmanZone America/Aruba -4:40:24 - LMT 1912 Feb 12 # Oranjestad 17619878Swollman -4:30 - ANT 1965 # Netherlands Antilles Time 17714343Swollman -4:00 - AST 17814343Swollman 1792742Swollman# Bolivia 1802742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 1812742SwollmanZone America/La_Paz -4:32:36 - LMT 1890 18219878Swollman -4:32:36 - LPMT 1931 Oct 15 # La Paz Mean Time 18319878Swollman -4:32:36 1:00 BOST 1932 Mar 21 # Bolivia ST 18419878Swollman -4:00 - BOT # Bolivia Time 1852742Swollman 1862742Swollman# Brazil 1872742Swollman 1882742Swollman# From Guy Harris: 18919878Swollman# The OAG lists 1987-10-25 and 1988-02-12 as the starting and 1902742Swollman# ending dates, giving them as "estimated date(s) based on previous year". We 1912742Swollman# infer a rule here from one example, always a dangerous practice.... Yes, 1922742Swollman# they really do switch on Saturday, according to the OAG. 19314343Swollman# "[America/Porto_Acre]" is for the Territory of Acre; 19414343Swollman# "[America/Noronha]" is for Fernando De Noronha. 1952742Swollman 19619878Swollman# From Paul Eggert <eggert@twinsun.com> (1993-11-18): 1972742Swollman# The mayor of Rio recently attempted to change the time zone rules 1982742Swollman# just in his city, in order to leave more summer time for the tourist trade. 1992742Swollman# The rule change lasted only part of the day; 2002742Swollman# the federal government refused to follow the city's rules, and business 2012742Swollman# was in a chaos, so the mayor backed down that afternoon. 2022742Swollman 20320094Swollman# From IATA SSIM (1996-02): 20420094Swollman# _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS), 20520094Swollman# Santa Catarina (SC), Parana (PR), Sao Paulo (SP), Rio de Janeiro (RJ), 20620094Swollman# Espirito Santo (ES), Minas Gerais (MG), Bahia (BA), Goias (GO), 20720094Swollman# Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL]. 20820094Swollman# [The last three states are new to this issue of the IATA SSIM.] 20920094Swollman 21020094Swollman# From Gwillim Law (1996-10-07): 21120094Swollman# Geography, history (Tocantins was part of Goias until 1989), and other 21220094Swollman# sources of time zone information lead me to believe that AL, SE, and TO were 21320094Swollman# always in BR1, and so the only change was whether or not they observed DST.... 21420094Swollman# The earliest issue of the SSIM I have is 2/91. Each issue from then until 21520094Swollman# 9/95 says that DST is observed only in the ten states I quoted from 9/95, 21620094Swollman# along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2 21720094Swollman# (UTC-4).... The other two time zones given for Brazil are BR3, which is 21820094Swollman# UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is 21920094Swollman# UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's 22020094Swollman# become part of the state of Pernambuco). The boundary between BR1 and BR2 22120094Swollman# has never been clearly stated. They've simply been called East and West. 22220094Swollman# However, some conclusions can be drawn from another IATA manual: the Airline 22320094Swollman# Coding Directory, which lists close to 400 airports in Brazil. For each 22420094Swollman# airport it gives a time zone which is coded to the SSIM. From that 22520094Swollman# information, I'm led to conclude that the states of Amapa (AP), Ceara (CE), 22620094Swollman# Maranhao (MA), Paraiba (PR), Pernambuco (PE), Piaui (PI), and Rio Grande do 22720094Swollman# Norte (RN), and the eastern part of Para (PA) are all in BR1 without DST. 22820094Swollman 22920094Swollman# From Paul Eggert (1996-11-22): 23020094Swollman# Let's make the following assumptions: 23120094Swollman# 23220094Swollman# * All data in Shanks are correct through 1990. In particular, 23320094Swollman# Shanks was right when he said Acre stopped observing DST in mid-1988. 23420094Swollman# * Areas where Shanks reports DST up to 1990, but the IATA reports no DST 23520094Swollman# in 1995, stopped observing DST in mid-1990. 23620094Swollman# 23720094Swollman# Under these assumptions Brazil needs 7 entries to cover all the distinct 23820094Swollman# time zone histories since 1970: 23920094Swollman# 24020094Swollman# Noronha (UTC-2), Fortaleza (UTC-3), and Manaus (UTC-4) stopped observing DST 24120094Swollman# in mid-1990. 24220094Swollman# Maceio (UTC-3) stopped observing DST in mid-1990, but started again mid-1995. 24320094Swollman# Sao Paulo (UTC-3) and Cuiaba (UTC-4) always observed DST. 24420094Swollman# Porto Acre (UTC-5) stopped observing DST in mid-1988. 24520094Swollman 2462742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 24719878SwollmanRule Brazil 1931 only - Oct 3 11:00 1:00 D 2482742SwollmanRule Brazil 1932 1933 - Apr 1 0:00 0 S 24919878SwollmanRule Brazil 1932 only - Oct 3 0:00 1:00 D 25019878SwollmanRule Brazil 1949 1952 - Dec 1 0:00 1:00 D 2512742SwollmanRule Brazil 1950 only - Apr 16 0:00 0 S 2522742SwollmanRule Brazil 1951 1953 - Apr 1 0:00 0 S 25319878SwollmanRule Brazil 1963 only - Dec 9 0:00 1:00 D 2542742SwollmanRule Brazil 1964 only - Mar 1 0:00 0 S 25519878SwollmanRule Brazil 1965 only - Jan 31 0:00 1:00 D 2562742SwollmanRule Brazil 1965 only - Apr 1 0:00 0 S 25719878SwollmanRule Brazil 1965 only - Dec 1 0:00 1:00 D 2582742SwollmanRule Brazil 1966 1968 - Mar 1 0:00 0 S 25919878SwollmanRule Brazil 1966 1967 - Nov 1 0:00 1:00 D 26019878SwollmanRule Brazil 1985 only - Nov 2 0:00 1:00 D 2612742SwollmanRule Brazil 1986 only - Mar 15 0:00 0 S 26219878SwollmanRule Brazil 1986 1987 - Oct Sat<=28 0:00 1:00 D 2632742SwollmanRule Brazil 1987 only - Feb 14 0:00 0 S 2642742SwollmanRule Brazil 1988 only - Feb 7 0:00 0 S 2652742SwollmanRule Brazil 1989 only - Jan 22 0:00 0 S 26620094SwollmanRule Brazil 1988 1989 - Oct Sun>=10 0:00 1:00 D 26720094SwollmanRule Brazil 1990 1991 - Feb Sun>=11 0:00 0 S 26820094SwollmanRule Brazil 1990 1992 - Oct Sun>=20 0:00 1:00 D 26920094SwollmanRule Brazil 1992 only - Feb 9 0:00 0 S 27020094SwollmanRule Brazil 1993 max - Oct Sun>=11 0:00 1:00 D 27120094SwollmanRule Brazil 1993 only - Jan 31 0:00 0 S 27220094SwollmanRule Brazil 1994 1995 - Feb Sun>=15 0:00 0 S 27320094SwollmanRule Brazil 1996 max - Feb Sun>=11 0:00 0 S 27420094Swollman 2752742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 27620094Swollman# 27720094Swollman# Fernando de Noronha 2782742SwollmanZone America/Noronha -2:09:40 - LMT 1914 2792742Swollman -2:00 - FST 1963 Dec 9 28020094Swollman -2:00 Brazil F%sT 1990 Jul 28120094Swollman -2:00 - FST 28220094Swollman# 28320094Swollman# Amapa, east Para, Maranhao, Piaui, Ceara, Rio Grande do Norte, Paraiba, 28420094Swollman# Pernambuco (except Fernando de Noronha) 28520094SwollmanZone America/Fortaleza -2:34:00 - LMT 1914 28620094Swollman -3:00 - EST 1963 Dec 9 28720094Swollman -3:00 Brazil E%sT 1990 Jul 28820094Swollman -3:00 - EST 28920094Swollman# 29020094Swollman# Alagoas, Sergipe, Tocantins 29120094SwollmanZone America/Maceio -2:22:52 - LMT 1914 29220094Swollman -3:00 - EST 1963 Dec 9 29320094Swollman -3:00 Brazil E%sT 1990 Jul 29420094Swollman -3:00 - EST 1995 Jul 29520094Swollman -3:00 Brazil E%sT 29620094Swollman# 29720094Swollman# Bahia, Goias, Distrito Federal, Minas Gerais, Espirito Santo, Rio de Janeiro, 29820094Swollman# Sao Paulo, Parana, Santa Catarina, Rio Grande do Sul 2992742SwollmanZone America/Sao_Paulo -3:06:28 - LMT 1914 3002742Swollman -3:00 Brazil E%sT 30120094Swollman# 30220094Swollman# Mato Grosso, Mato Grosso do Sul 30320094SwollmanZone America/Cuiaba -3:44:20 - LMT 1914 30420094Swollman -4:00 - WST 1963 Dec 9 30520094Swollman -4:00 Brazil W%sT 30620094Swollman# 30720094Swollman# Roraima, west Para, Amazonas, Rondonia 3082742SwollmanZone America/Manaus -4:00:04 - LMT 1914 3092742Swollman -4:00 - WST 1963 Dec 9 31020094Swollman -4:00 Brazil W%sT 1990 Jul 31120094Swollman -4:00 - WST 31220094Swollman# 31320094Swollman# Acre 3142742Swollman# Rio_Branco is too ambiguous, since there's a Rio Branco in Uruguay too. 3152742SwollmanZone America/Porto_Acre -4:31:12 - LMT 1914 3162742Swollman -5:00 - AST 1963 Dec 9 31720094Swollman -5:00 Brazil A%sT 1988 Jul 31820094Swollman -5:00 - AST 3192742Swollman# 3202742Swollman# Martin Vaz and Trinidade are like America/Noronha. 3212742Swollman 3222742Swollman 3232742Swollman# Chile 3242742Swollman 32514343Swollman# From Eduardo Krell (1995-10-19): 32614343Swollman# The law says to switch to DST at midnight [24:00] on the second SATURDAY 32714343Swollman# of October.... The law is the same for March and October. 3282742Swollman 3292742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 33019878SwollmanRule Chile 1918 only - Sep 1 0:00 1:00 S 33119878SwollmanRule Chile 1919 only - Jul 2 0:00 0 - 33219878SwollmanRule Chile 1927 1931 - Sep 1 0:00 1:00 S 33319878SwollmanRule Chile 1928 1932 - Apr 1 0:00 0 - 33419878SwollmanRule Chile 1969 max - Oct Sun>=9 0:00 1:00 S 33519878SwollmanRule Chile 1970 max - Mar Sun>=9 0:00 0 - 33620094Swollman# IATA SSIM anomalies: (1990-09) says 1990-09-16; (1992-02) says 1992-03-14; 33720094Swollman# (1996-09) says 1998-03-08. Ignore these for now. 3382742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3392742SwollmanZone America/Santiago -4:42:40 - LMT 1890 34019878Swollman -4:42:40 - SMT 1910 # Santiago Mean Time 34119878Swollman -5:00 Chile CL%sT 1932 Sep # Chile Time 34219878Swollman -4:00 Chile CL%sT 3432742SwollmanZone Pacific/Easter -7:17:28 - LMT 1890 # Mataveri 34419878Swollman -7:17:28 - MMT 1932 Sep # Mataveri Mean Time 34519878Swollman -7:00 Chile EAS%sT 1982 Mar 14 # Easter I Time 34619878Swollman -6:00 Chile EAS%sT 3472742Swollman# 3482742Swollman# Whitman says Juan Fernandez Is are like America/Santiago. 3492742Swollman# San Ambrosio, San Felix 3502742Swollman# no information; probably like America/Santiago 3512742Swollman 3522742Swollman 3532742Swollman# Colombia 35420094Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 35520094SwollmanRule CO 1992 only - May 2 0:00 1:00 S 35620094SwollmanRule CO 1992 only - Dec 31 0:00 0 - 3572742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3582742SwollmanZone America/Bogota -4:56:20 - LMT 1884 Mar 13 35919878Swollman -4:56:20 - BMT 1914 Nov 23 # Bogota Mean Time 36020094Swollman -5:00 CO CO%sT # Colombia Time 3612742Swollman# Malpelo, Providencia, San Andres 3622742Swollman# no information; probably like America/Bogota 3632742Swollman 3642742Swollman# Curacao 3652742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3662742SwollmanZone America/Curacao -4:35:44 - LMT 1912 Feb 12 # Willemstad 36719878Swollman -4:30 - ANT 1965 # Netherlands Antilles Time 3682742Swollman -4:00 - AST 3692742Swollman 3702742Swollman# Ecuador 3712742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3722742SwollmanZone America/Guayaquil -5:19:20 - LMT 1890 37319878Swollman -5:14:00 - QMT 1931 # Quito Mean Time 37419878Swollman -5:00 - ECT # Ecuador Time 3752742SwollmanZone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno 37619878Swollman -5:00 - ECT 1986 37719878Swollman -6:00 - GALT # Galapagos Time 3782742Swollman 3792742Swollman# Falklands 3802742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 38119878SwollmanRule Falk 1937 1938 - Sep lastSun 0:00 1:00 S 38219878SwollmanRule Falk 1938 1942 - Mar Sun>=19 0:00 0 - 38319878SwollmanRule Falk 1939 only - Oct 1 0:00 1:00 S 38419878SwollmanRule Falk 1940 1942 - Sep lastSun 0:00 1:00 S 38519878SwollmanRule Falk 1943 only - Jan 1 0:00 0 - 38619878SwollmanRule Falk 1983 only - Sep lastSun 0:00 1:00 S 38719878SwollmanRule Falk 1984 1985 - Apr lastSun 0:00 0 - 38819878SwollmanRule Falk 1984 only - Sep 16 0:00 1:00 S 38920094SwollmanRule Falk 1985 1995 - Sep Sun>=9 0:00 1:00 S 39019878SwollmanRule Falk 1986 max - Apr Sun>=16 0:00 0 - 39120094SwollmanRule Falk 1996 max - Sep Sun>=8 0:00 1:00 S 3922742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 3932742SwollmanZone Atlantic/Stanley -3:51:24 - LMT 1890 39419878Swollman -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time 39519878Swollman -4:00 Falk FK%sT 1983 May # Falkland Is Time 39619878Swollman -3:00 Falk FK%sT 1985 Sep 15 39719878Swollman -4:00 Falk FK%sT 3982742Swollman 3992742Swollman# French Guiana 4002742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 4012742SwollmanZone America/Cayenne -3:29:20 - LMT 1911 Jul 40219878Swollman -4:00 - GFT 1967 Oct # French Guiana Time 40319878Swollman -3:00 - GFT 4042742Swollman 4052742Swollman# Guyana 4062742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 4072742SwollmanZone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown 40819878Swollman -3:45 - GBGT 1966 May 26 # Br Guiana Time 40919878Swollman -3:45 - GYT 1975 Jul 31 # Guyana Time 41020094Swollman -3:00 - GYT 1991 41120094Swollman# IATA SSIM (1996-06) says -4:00. Assume a 1991 switch. 41220094Swollman -4:00 - GYT 4132742Swollman 4142742Swollman# Paraguay 4152742Swollman 41619878Swollman# From Bob Devine (1988-01-28): 4172742Swollman# Paraguay: First day in October to last in March. Midnight switch?? 4182742Swollman# Since 1980. 4192742Swollman 42019878Swollman# From U. S. Naval Observatory (1989-01-19): 4212742Swollman# PARAGUAY 4 H BEHIND UTC 4222742Swollman# PARAGUAY 3 H BEHIND UTC OCT 1, '88-MAR 31, '89 4232742Swollman 4242742Swollman# From Shanks (1991): 4252742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 42619878SwollmanRule Para 1975 1978 - Oct 1 0:00 1:00 S 42719878SwollmanRule Para 1975 1978 - Mar 1 0:00 0 - 4282742Swollman# Shanks says 1979 was all DST. 42920094SwollmanRule Para 1980 1991 - Apr 1 0:00 0 - 43019878SwollmanRule Para 1980 1988 - Oct 1 0:00 1:00 S 43119878SwollmanRule Para 1989 only - Oct 22 0:00 1:00 S 43220094SwollmanRule Para 1990 only - Oct 1 0:00 1:00 S 43320094SwollmanRule Para 1991 only - Oct 6 0:00 1:00 S 43420094SwollmanRule Para 1992 only - Mar 1 0:00 0 - 43520094SwollmanRule Para 1992 only - Oct 5 0:00 1:00 S 43620094SwollmanRule Para 1993 only - Mar 31 0:00 0 - 43720094SwollmanRule Para 1993 max - Oct 1 0:00 1:00 S 43820094SwollmanRule Para 1994 1995 - Feb lastSun 0:00 0 - 43920094SwollmanRule Para 1996 max - Mar 1 0:00 0 - 4402742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 4412742SwollmanZone America/Asuncion -3:50:40 - LMT 1890 44219878Swollman -3:50:40 - AMT 1931 Oct 10 # Asuncion Mean Time 44319878Swollman -4:00 - PYT 1972 Oct # Paraguay Time 44419878Swollman -3:00 - PYT 1974 Apr 44519878Swollman -4:00 Para PY%sT 4462742Swollman 4472742Swollman# Peru 4482742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 44919878SwollmanRule Peru 1938 only - Jan 1 0:00 1:00 S 45019878SwollmanRule Peru 1938 only - Apr 1 0:00 0 - 45119878SwollmanRule Peru 1938 1939 - Sep lastSun 0:00 1:00 S 45219878SwollmanRule Peru 1939 1940 - Mar Sun>=24 0:00 0 - 45319878SwollmanRule Peru 1987 only - Jan 1 0:00 1:00 S 45419878SwollmanRule Peru 1987 only - Apr 1 0:00 0 - 45519878SwollmanRule Peru 1990 only - Jan 1 0:00 1:00 S 45619878SwollmanRule Peru 1990 only - Apr 1 0:00 0 - 45720094SwollmanRule Peru 1993 only - Jan 1 0:00 1:00 S 45820094SwollmanRule Peru 1993 only - Apr 1 0:00 0 - 4592742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 4602742SwollmanZone America/Lima -5:08:12 - LMT 1890 46119878Swollman -5:09 - LMT 1908 Jul 28 # Lima Mean Time 46219878Swollman -5:00 Peru PE%sT # Peru Time 4632742Swollman 4642742Swollman# South Georgia 4652742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 4662742SwollmanZone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken 46719878Swollman -2:00 - GST # South Georgia Time 4682742Swollman 4692742Swollman# South Sandwich Is 47014343Swollman# uninhabited 4712742Swollman 4722742Swollman# Suriname 4732742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 4742742SwollmanZone America/Paramaribo -3:40:40 - LMT 1911 4752742Swollman -3:40:52 - PMT 1935 # Paramaribo Mean Time 4762742Swollman -3:40:36 - PMT 1945 Oct # The capital moved? 47719878Swollman -3:30 - NEGT 1975 Nov 20 # Dutch Guiana Time 47819878Swollman -3:30 - SRT 1984 Oct # Suriname Time 47919878Swollman -3:00 - SRT 4802742Swollman 4812742Swollman# Trinidad and Tobago 4822742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 4832742SwollmanZone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2 4842742Swollman -4:00 - AST 4852742Swollman 4862742Swollman# Uruguay 48719878Swollman# From Paul Eggert <eggert@twinsun.com> (1993-11-18): 4882742Swollman# Uruguay wins the prize for the strangest peacetime manipulation of the rules. 4892742Swollman# From Shanks (1991): 4902742Swollman# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 4912742Swollman# Whitman gives 1923 Oct 1; go with Shanks. 49219878SwollmanRule Uruguay 1923 only - Oct 2 0:00 0:30 HS 49319878SwollmanRule Uruguay 1924 1926 - Apr 1 0:00 0 - 49419878SwollmanRule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS 49519878SwollmanRule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS 4962742Swollman# Shanks gives 1935 Apr 1 0:00 and 1936 Mar 30 0:00; go with Whitman. 49719878SwollmanRule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 - 49819878SwollmanRule Uruguay 1936 only - Nov 1 0:00 0:30 HS 49919878SwollmanRule Uruguay 1937 1941 - Mar lastSun 0:00 0 - 5002742Swollman# Whitman gives 1937 Oct 3; go with Shanks. 50119878SwollmanRule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HS 5022742Swollman# Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13, 5032742Swollman# and 1943 Apr 13 ``to present time''; go with Shanks. 50419878SwollmanRule Uruguay 1941 only - Aug 1 0:00 0 - 50519878SwollmanRule Uruguay 1942 only - Jan 1 0:00 0:30 HS 50619878SwollmanRule Uruguay 1942 only - Dec 14 0:00 1:00 S 50719878SwollmanRule Uruguay 1943 only - Mar 14 0:00 0 - 50819878SwollmanRule Uruguay 1959 only - May 24 0:00 1:00 S 50919878SwollmanRule Uruguay 1959 only - Nov 15 0:00 0 - 51019878SwollmanRule Uruguay 1960 only - Jan 17 0:00 1:00 S 51119878SwollmanRule Uruguay 1960 only - Mar 6 0:00 0 - 51219878SwollmanRule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 S 51319878SwollmanRule Uruguay 1965 only - Sep 26 0:00 0 - 51419878SwollmanRule Uruguay 1966 1967 - Oct 31 0:00 0 - 51519878SwollmanRule Uruguay 1968 1970 - May 27 0:00 0:30 HS 51619878SwollmanRule Uruguay 1968 1970 - Dec 2 0:00 0 - 51719878SwollmanRule Uruguay 1972 only - Apr 24 0:00 1:00 S 51819878SwollmanRule Uruguay 1972 only - Aug 15 0:00 0 - 51919878SwollmanRule Uruguay 1974 only - Mar 10 0:00 0:30 HS 52019878SwollmanRule Uruguay 1974 only - Dec 22 0:00 1:00 S 52119878SwollmanRule Uruguay 1976 only - Oct 1 0:00 0 - 52219878SwollmanRule Uruguay 1977 only - Dec 4 0:00 1:00 S 52319878SwollmanRule Uruguay 1978 only - Apr 1 0:00 0 - 52419878SwollmanRule Uruguay 1979 only - Oct 1 0:00 1:00 S 52519878SwollmanRule Uruguay 1980 only - May 1 0:00 0 - 52619878SwollmanRule Uruguay 1987 only - Dec 14 0:00 1:00 S 52719878SwollmanRule Uruguay 1988 only - Mar 14 0:00 0 - 52819878SwollmanRule Uruguay 1988 only - Dec 11 0:00 1:00 S 52919878SwollmanRule Uruguay 1989 only - Mar 12 0:00 0 - 53019878SwollmanRule Uruguay 1989 only - Oct 29 0:00 1:00 S 53120094SwollmanRule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 - 53220094SwollmanRule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S 53320094SwollmanRule Uruguay 1992 1993 - Oct Sun>=15 0:00 1:00 S 53420094SwollmanRule Uruguay 1993 only - Feb 28 0:00 0 - 5352742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 5362742SwollmanZone America/Montevideo -3:44:44 - LMT 1898 Jun 28 53719878Swollman -3:44:44 - MMT 1920 May 1 # Montevideo MT 53819878Swollman -3:30 Uruguay UY%sT 1942 Dec 14 # Uruguay Time 53919878Swollman -3:00 Uruguay UY%sT 5402742Swollman 5412742Swollman# Venezuela 5422742Swollman# Zone NAME GMTOFF RULES FORMAT [UNTIL] 5432742SwollmanZone America/Caracas -4:27:44 - LMT 1890 54419878Swollman -4:27:44 - CMT 1912 Feb 12 # Caracas Mean Time 54519878Swollman -4:30 - VET 1965 # Venezuela Time 54619878Swollman -4:00 - VET 547