southamerica revision 2742
1# @(#)southamerica 7.6 2 3# This data is by no means authoritative; if you think you know better, 4# go ahead and edit the file (and please send any changes to 5# tz@elsie.nci.nih.gov for general use in the future). 6 7# From Paul Eggert <eggert@twinsun.com> (November 18, 1993): 8# A good source for time zone historical data outside the U.S. is 9# Thomas G. Shanks, The International Atlas (3rd edition), 10# San Diego: ACS Publications, Inc. (1991). 11# Except where otherwise noted, it is the source for the data below. 12# 13# I invented the abbreviations marked `*' in the following table; 14# the rest are from earlier versions of this file, or from other sources. 15# Some of these are just plausible excuses for common English abbreviations. 16# Corrections are welcome! 17# std dst 18# LMT Local Mean Time 19# -2:00 FST FDT Fernando de Noronha 20# -3:00 EST EDT Eastern South America (conflicts with -5:00) 21# -4:00 AST ADT Andes*, Antilles*, Asuncion*, Atlantic 22# -4:00 CST CDT Chile (conflicts with -6:00) 23# -4:00 WST WDT Western Brazil 24# -5:00 AST ADT Acre (conflicts with -4:00) 25# -5:00 EST EDT Eastern, Ecuador* 26# -6:00 CST CDT Archipelago of Columbus*, Central 27# -7:00 MST MDT Mataveri*, Mountain 28# 29# See the `africa' file for Zone naming conventions. 30 31# From Guy Harris: 32# From Official Airline Guide - Worldwide Edition (1987). Countries not 33# listed here do not observe DST, according to the OAG. Time zone names 34# are pure inventions, and none are supplied for countries not observing 35# DST; updates from natives would be appreciated. The times that DST 36# starts and ends are based on the assumption that they switch a 2AM just 37# as everybody else does. 38 39############################################################################### 40 41############################################################################### 42 43# Argentina 44 45# From Bob Devine (January 28, 1988): 46# Argentina: first Sunday in October to first Sunday in April since 1976. 47# Double Summer time from 1969 to 1974. Switches at midnight. 48 49# From U. S. Naval Observatory (January 19, 19889): 50# ARGENTINA 3 H BEHIND UTC 51 52# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 53Rule Arg 1930 only - Dec 1 0:00 1:00 D 54Rule Arg 1931 only - Apr 1 0:00 0 S 55Rule Arg 1931 only - Oct 15 0:00 1:00 D 56Rule Arg 1932 1940 - Mar 1 0:00 0 S 57Rule Arg 1932 1939 - Nov 1 0:00 1:00 D 58Rule Arg 1940 only - Jul 1 0:00 1:00 D 59Rule Arg 1941 only - Jun 15 0:00 0 S 60Rule Arg 1941 only - Oct 15 0:00 1:00 D 61Rule Arg 1943 only - Aug 1 0:00 0 S 62Rule Arg 1943 only - Oct 15 0:00 1:00 D 63Rule Arg 1946 only - Mar 1 0:00 0 S 64Rule Arg 1946 only - Oct 1 0:00 1:00 D 65Rule Arg 1963 only - Oct 1 0:00 0 S 66Rule Arg 1963 only - Dec 15 0:00 1:00 D 67Rule Arg 1964 1966 - Mar 1 0:00 0 S 68Rule Arg 1964 1966 - Oct 15 0:00 1:00 D 69Rule Arg 1967 only - Apr 1 0:00 0 S 70Rule Arg 1967 1968 - Oct Sun<=7 0:00 1:00 D 71Rule Arg 1968 1969 - Apr Sun<=7 0:00 0 S 72Rule Arg 1974 only - Jan 23 0:00 1:00 D 73Rule Arg 1974 only - May 1 0:00 0 S 74Rule Arg 1974 1976 - Oct Sun<=7 0:00 1:00 D 75Rule Arg 1975 1977 - Apr Sun<=7 0:00 0 S 76Rule Arg 1985 only - Nov 2 0:00 1:00 D 77Rule Arg 1986 only - Mar 14 0:00 0 S 78Rule Arg 1986 1987 - Oct 25 0:00 1:00 D 79Rule Arg 1987 only - Feb 13 0:00 0 S 80Rule Arg 1988 only - Feb 7 0:00 0 S 81Rule Arg 1988 only - Dec 1 0:00 1:00 D 82Rule Arg 1989 only - Mar 16 0:00 0 S 83Rule Arg 1989 only - Oct 15 0:00 1:00 D 84Rule Arg 1990 only - Mar 4 0:00 0 S 85# _The Economist_ (8 Jan 1994, p 42) reports that Argentina 86# had DST in 1991-2 and 1992-3, but not in 1990-1 or in 1993-4. 87# It has something to do with electricity companies meeting demand in summer. 88# We don't know the 1991-3 transition times, unfortunately. 89# Zone NAME GMTOFF RULES FORMAT [UNTIL] 90Zone America/Buenos_Aires -3:53:48 - LMT 1894 Nov 91 -4:17 - CMT 1920 May # Cordoba Mean Time 92 -4:00 - AST 1930 Dec 93 -4:00 Arg A%sT 1969 Oct 5 94 -3:00 Arg E%sT 95 96# Bolivia 97# Zone NAME GMTOFF RULES FORMAT [UNTIL] 98Zone America/La_Paz -4:32:36 - LMT 1890 99 -4:33 - LPMT 1931 Oct 15 # La Paz Mean Time 100 -4:33 1:00 LPDT 1932 Mar 21 101 -4:00 - AST 102 103# Brazil 104 105# From Guy Harris: 106# The OAG lists October 25, 1987 and February 12, 1988 as the starting and 107# ending dates, giving them as "estimated date(s) based on previous year". We 108# infer a rule here from one example, always a dangerous practice.... Yes, 109# they really do switch on Saturday, according to the OAG. 110# "Brazil/Acre" is for the Territory of Acre; "Brazil/DeNoronha" is for 111# Fernando De Noronha. 112 113# From Bob Devine (January 28, 1988): 114# The only information I found is that there was no DST up to 1985. 115# But there was some before 1952! 116 117# From U. S. Naval Observatory (January 16, 1989): 118# BRAZIL WEST 5 H BEHIND UTC TERRITORY OF ACRE 119# BRAZIL WEST 4 H BEHIND UTC ACRE OCT 23, '88-FEB 11, 120# BRAZIL '89 (ESTIMATED) 121# BRAZIL CENTRAL 4 H BEHIND UTC MANAUS 122# BRAZIL CENTRAL 3 H BEHIND UTC MANAUS OCT 23, '88-FEB 11, 123# BRAZIL CENTRAL '89 (ESTIMATED) 124# BRAZIL EAST 3 H BEHIND UTC COASTAL STATES, RIO, SAO 125# BRAZIL EAST PAULO, BRASILIA 126# BRAZIL EAST 2 H BEHIND UTC COASTAL STATES, RIO, SAO 127# BRAZIL PAULO, BRASILIA OCT 23, 128# BRAZIL '88-FEB 11, '89 129# BRAZIL (ESTIMATED) 130# BRAZIL 2 H BEHIND UTC ATLANTIC ISLANDS, FERNANDO 131# BRAZIL DE NORONHA 132# BRAZIL 1 H BEHIND UTC OCT 23, '88-FEB 11, '89 133# BRAZIL (ESTIMATED) 134# BRAZIL 3 H BEHIND UTC FOR MOST MAJOR AIRPORTS. 135 136# From Paul Eggert <eggert@twinsun.com> (November 18, 1993): 137# The mayor of Rio recently attempted to change the time zone rules 138# just in his city, in order to leave more summer time for the tourist trade. 139# The rule change lasted only part of the day; 140# the federal government refused to follow the city's rules, and business 141# was in a chaos, so the mayor backed down that afternoon. 142# Shanks claims Acre stopped observing DST after 1988 Feb 7, but it 143# could just be that his table ran out of room. We're extrapolating 144# about time zone changes after 1990 Feb 11. 145 146# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 147Rule Brazil 1914 only - Jan 1 0:00 0 S 148Rule Brazil 1931 only - Oct 3 11:00 1 D 149Rule Brazil 1932 1933 - Apr 1 0:00 0 S 150Rule Brazil 1932 only - Oct 3 0:00 1 D 151Rule Brazil 1949 1952 - Dec 1 0:00 1 D 152Rule Brazil 1950 only - Apr 16 0:00 0 S 153Rule Brazil 1951 1953 - Apr 1 0:00 0 S 154Rule Brazil 1963 only - Dec 9 0:00 1 D 155Rule Brazil 1964 only - Mar 1 0:00 0 S 156Rule Brazil 1965 only - Jan 31 0:00 1 D 157Rule Brazil 1965 only - Apr 1 0:00 0 S 158Rule Brazil 1965 only - Dec 1 0:00 1 D 159Rule Brazil 1966 1968 - Mar 1 0:00 0 S 160Rule Brazil 1966 1967 - Nov 1 0:00 1 D 161Rule Brazil 1985 only - Nov 2 0:00 1 D 162Rule Brazil 1986 only - Mar 15 0:00 0 S 163Rule Brazil 1986 1987 - Oct Sat<=28 0:00 1 D 164Rule Brazil 1987 only - Feb 14 0:00 0 S 165Rule Brazil 1988 only - Feb 7 0:00 0 S 166Rule Brazil 1989 only - Jan 22 0:00 0 S 167Rule Brazil 1988 max - Oct Sun>=15 0:00 1 D 168Rule Brazil 1990 max - Feb Sun>=8 0:00 0 S 169# Zone NAME GMTOFF RULES FORMAT [UNTIL] 170Zone America/Noronha -2:09:40 - LMT 1914 171 -2:00 - FST 1963 Dec 9 172 -2:00 Brazil F%sT 173Zone America/Sao_Paulo -3:06:28 - LMT 1914 174 -3:00 Brazil E%sT 175Zone America/Manaus -4:00:04 - LMT 1914 176 -4:00 - WST 1963 Dec 9 177 -4:00 Brazil W%sT 178# Rio_Branco is too ambiguous, since there's a Rio Branco in Uruguay too. 179Zone America/Porto_Acre -4:31:12 - LMT 1914 180 -5:00 - AST 1963 Dec 9 181 -5:00 Brazil A%sT 182# 183# Martin Vaz and Trinidade are like America/Noronha. 184 185 186# Chile 187 188# From Guy Harris: 189# The OAG lists October 11, 1987 and March 12, 1988 as the starting and 190# ending dates, giving them as "estimated date(s) based on previous year." 191 192# From Bob Devine (January 28, 1988): 193# Chile has had 2nd Sunday in October to 2nd Sunday in March DST since 1977. 194# Switch is at midnight. OAG is right. 195 196# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 197Rule Chile 1918 only - Sep 1 0:00 1:00 D 198Rule Chile 1919 only - Jul 2 0:00 0 S 199Rule Chile 1927 1931 - Sep 1 0:00 1:00 D 200Rule Chile 1928 1932 - Apr 1 0:00 0 S 201Rule Chile 1969 max - Oct Sun>=8 0:00 1:00 D 202Rule Chile 1970 max - Mar Sun>=8 0:00 0 S 203# Zone NAME GMTOFF RULES FORMAT [UNTIL] 204Zone America/Santiago -4:42:40 - LMT 1890 205 -4:43 - SMT 1910 # Santiago Mean Time 206 -5:00 Chile C%sT 1932 Sep 207 -4:00 Chile C%sT 208Zone Pacific/Easter -7:17:28 - LMT 1890 # Mataveri 209 -7:17 - MMT 1932 Sep # Mataveri Mean Time 210 -7:00 Chile M%sT 1982 Mar 14 211 -6:00 Chile C%sT 212# 213# Whitman says Juan Fernandez Is are like America/Santiago. 214# San Ambrosio, San Felix 215# no information; probably like America/Santiago 216 217 218# Colombia 219# Zone NAME GMTOFF RULES FORMAT [UNTIL] 220Zone America/Bogota -4:56:20 - LMT 1884 Mar 13 221 -4:56 - BMT 1914 Nov 23 # Bogota Mean Time 222 -5:00 - EST 223# Malpelo, Providencia, San Andres 224# no information; probably like America/Bogota 225 226# Curacao 227# Zone NAME GMTOFF RULES FORMAT [UNTIL] 228Zone America/Curacao -4:35:44 - LMT 1912 Feb 12 # Willemstad 229 -4:30 - NAST 1965 # Netherlands Antilles 230 -4:00 - AST 231 232# Ecuador 233# Zone NAME GMTOFF RULES FORMAT [UNTIL] 234Zone America/Guayaquil -5:19:20 - LMT 1890 235 -5:14 - QMT 1931 # Quito Mean Time 236 -5:00 - EST 237Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno 238 -5:00 - EST 1986 239 -6:00 - CST 240 241# Falklands 242# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 243Rule Falk 1912 only - Mar 12 0:00 0 S 244Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 D 245Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 S 246Rule Falk 1939 only - Oct 1 0:00 1:00 D 247Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 D 248Rule Falk 1943 only - Jan 1 0:00 0 S 249Rule Falk 1983 only - Sep lastSun 0:00 1:00 D 250Rule Falk 1984 1985 - Apr lastSun 0:00 0 S 251Rule Falk 1984 only - Sep 16 0:00 1:00 D 252Rule Falk 1985 max - Sep Sun>=9 0:00 1:00 D 253Rule Falk 1986 max - Apr Sun>=16 0:00 0 S 254# Zone NAME GMTOFF RULES FORMAT [UNTIL] 255Zone Atlantic/Stanley -3:51:24 - LMT 1890 256 -3:51 - SMT 1912 Mar 12 # Stanley Mean Time 257 -4:00 Falk A%sT 1983 May 258 -3:00 Falk E%sT 1985 Sep 15 259 -4:00 Falk A%sT 260 261# French Guiana 262# Zone NAME GMTOFF RULES FORMAT [UNTIL] 263Zone America/Cayenne -3:29:20 - LMT 1911 Jul 264 -4:00 - AST 1967 Oct 265 -3:00 - EST 266 267# Guyana 268# Zone NAME GMTOFF RULES FORMAT [UNTIL] 269Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown 270 -3:45 - BGST 1975 Jul 31 # British Guiana ST 271 -3:00 - EST 272 273 274# Paraguay 275 276# From Bob Devine (January 28, 1988): 277# Paraguay: First day in October to last in March. Midnight switch?? 278# Since 1980. 279 280# From U. S. Naval Observatory (January 19, 1989): 281# PARAGUAY 4 H BEHIND UTC 282# PARAGUAY 3 H BEHIND UTC OCT 1, '88-MAR 31, '89 283 284# From Shanks (1991): 285# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 286Rule Para 1974 only - Apr 1 0:00 0 S 287Rule Para 1975 1978 - Oct 1 0:00 1:00 D 288Rule Para 1975 1978 - Mar 1 0:00 0 S 289# Shanks says 1979 was all DST. 290Rule Para 1980 max - Apr 1 0:00 0 S 291Rule Para 1980 1988 - Oct 1 0:00 1:00 D 292Rule Para 1989 only - Oct 22 0:00 1:00 D 293Rule Para 1990 max - Oct 1 0:00 1:00 D 294# Zone NAME GMTOFF RULES FORMAT [UNTIL] 295Zone America/Asuncion -3:50:40 - LMT 1890 296 -3:51 - AMT 1931 Oct 10 # Asuncion Mean Time 297 -4:00 - AST 1972 Oct 298 -3:00 - EST 1974 Apr 299 -4:00 Para A%sT 300 301# Peru 302# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 303Rule Peru 1908 only - Jul 28 0:00 0 S 304Rule Peru 1938 only - Jan 1 0:00 1:00 D 305Rule Peru 1938 only - Apr 1 0:00 0 S 306Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 D 307Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 S 308Rule Peru 1987 only - Jan 1 0:00 1:00 D 309Rule Peru 1987 only - Apr 1 0:00 0 S 310Rule Peru 1990 only - Jan 1 0:00 1:00 D 311Rule Peru 1990 only - Apr 1 0:00 0 S 312# Zone NAME GMTOFF RULES FORMAT [UNTIL] 313Zone America/Lima -5:08:12 - LMT 1890 314 -5:09 - LMT 1908 Jul 28 315 -5:00 Peru E%sT 316 317# South Georgia 318# Zone NAME GMTOFF RULES FORMAT [UNTIL] 319Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken 320 -2:00 - FST 321 322# South Sandwich Is 323# no information 324 325# Suriname 326# Zone NAME GMTOFF RULES FORMAT [UNTIL] 327Zone America/Paramaribo -3:40:40 - LMT 1911 328 -3:40:52 - PMT 1935 # Paramaribo Mean Time 329 -3:40:36 - PMT 1945 Oct # The capital moved? 330 -3:30 - DGST 1984 Oct # Dutch Guiana Std Time 331 -3:00 - EST 332 333# Trinidad and Tobago 334# Zone NAME GMTOFF RULES FORMAT [UNTIL] 335Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2 336 -4:00 - AST 337 338# Uruguay 339# From Paul Eggert <eggert@twinsun.com> (November 18, 1993): 340# Uruguay wins the prize for the strangest peacetime manipulation of the rules. 341# Your guess is as good as mine for what happened after 1989. 342# From Shanks (1991): 343# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 344Rule Uruguay 1920 only - May 1 0:00 0 S 345# Whitman gives 1923 Oct 1; go with Shanks. 346Rule Uruguay 1923 only - Oct 2 0:00 0:30 HD 347Rule Uruguay 1924 1926 - Apr 1 0:00 0 S 348Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HD 349Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HD 350# Shanks gives 1935 Apr 1 0:00 and 1936 Mar 30 0:00; go with Whitman. 351Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 S 352Rule Uruguay 1936 only - Nov 1 0:00 0:30 HD 353Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 S 354# Whitman gives 1937 Oct 3; go with Shanks. 355Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HD 356# Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13, 357# and 1943 Apr 13 ``to present time''; go with Shanks. 358Rule Uruguay 1941 only - Aug 1 0:00 0 S 359Rule Uruguay 1942 only - Jan 1 0:00 0:30 HD 360Rule Uruguay 1942 only - Dec 14 0:00 1:00 D 361Rule Uruguay 1943 only - Mar 14 0:00 0 S 362Rule Uruguay 1959 only - May 24 0:00 1:00 D 363Rule Uruguay 1959 only - Nov 15 0:00 0 S 364Rule Uruguay 1960 only - Jan 17 0:00 1:00 D 365Rule Uruguay 1960 only - Mar 6 0:00 0 S 366Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 D 367Rule Uruguay 1965 only - Sep 26 0:00 0 S 368Rule Uruguay 1966 1967 - Oct 31 0:00 0 S 369Rule Uruguay 1968 1970 - May 27 0:00 0:30 HD 370Rule Uruguay 1968 1970 - Dec 2 0:00 0 S 371Rule Uruguay 1972 only - Apr 24 0:00 1:00 D 372Rule Uruguay 1972 only - Aug 15 0:00 0 S 373Rule Uruguay 1974 only - Mar 10 0:00 0:30 HD 374Rule Uruguay 1974 only - Dec 22 0:00 1:00 D 375Rule Uruguay 1976 only - Oct 1 0:00 0 S 376Rule Uruguay 1977 only - Dec 4 0:00 1:00 D 377Rule Uruguay 1978 only - Apr 1 0:00 0 S 378Rule Uruguay 1979 only - Oct 1 0:00 1:00 D 379Rule Uruguay 1980 only - May 1 0:00 0 S 380Rule Uruguay 1987 only - Dec 14 0:00 1:00 D 381Rule Uruguay 1988 only - Mar 14 0:00 0 S 382Rule Uruguay 1988 only - Dec 11 0:00 1:00 D 383Rule Uruguay 1989 only - Mar 12 0:00 0 S 384Rule Uruguay 1989 only - Oct 29 0:00 1:00 D 385Rule Uruguay 1990 only - Mar 4 0:00 0 S 386# Zone NAME GMTOFF RULES FORMAT [UNTIL] 387Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28 388 -3:45 - MMT 1920 May 1 # Montevideo MT 389 -3:30 Uruguay U%sT 1942 Dec 14 # Uruguay ST 390 -3:00 Uruguay E%sT 391 392# Venezuela 393# Zone NAME GMTOFF RULES FORMAT [UNTIL] 394Zone America/Caracas -4:27:44 - LMT 1890 395 -4:28 - CMT 1912 Feb 12 # Caracas Mean Time 396 -4:30 - VZT 1965 # Venezuela Time 397 -4:00 - AST 398