southamerica revision 9908
1# @(#)southamerica 7.8 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# -3:00 ARST ARDT Argentina 22# -4:00 AST ADT Andes*, Antilles*, Asuncion*, Atlantic 23# -4:00 CST CDT Chile (conflicts with -6:00) 24# -4:00 WST WDT Western Brazil 25# -5:00 AST ADT Acre (conflicts with -4:00) 26# -5:00 EST EDT Eastern, Ecuador* 27# -6:00 CST CDT Archipelago of Columbus*, Central 28# -7:00 MST MDT Mataveri*, Mountain 29# 30# See the `africa' file for Zone naming conventions. 31 32# From Guy Harris: 33# From Official Airline Guide - Worldwide Edition (1987). Countries not 34# listed here do not observe DST, according to the OAG. Time zone names 35# are pure inventions, and none are supplied for countries not observing 36# DST; updates from natives would be appreciated. The times that DST 37# starts and ends are based on the assumption that they switch a 2AM just 38# as everybody else does. 39 40############################################################################### 41 42############################################################################### 43 44# Argentina 45 46# From Bob Devine (January 28, 1988): 47# Argentina: first Sunday in October to first Sunday in April since 1976. 48# Double Summer time from 1969 to 1974. Switches at midnight. 49 50# From U. S. Naval Observatory (January 19, 19889): 51# ARGENTINA 3 H BEHIND UTC 52 53# From Hernan G. Otero <hernan@isoft.com.ar> (June 26, 1995): 54# I am sending modifications to the Argentinian time zone table... 55# AR was chosen because they are the ISO letters that represent Argentina. 56 57# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 58Rule Arg 1930 only - Dec 1 0:00 1:00 D 59Rule Arg 1931 only - Apr 1 0:00 0 S 60Rule Arg 1931 only - Oct 15 0:00 1:00 D 61Rule Arg 1932 1940 - Mar 1 0:00 0 S 62Rule Arg 1932 1939 - Nov 1 0:00 1:00 D 63Rule Arg 1940 only - Jul 1 0:00 1:00 D 64Rule Arg 1941 only - Jun 15 0:00 0 S 65Rule Arg 1941 only - Oct 15 0:00 1:00 D 66Rule Arg 1943 only - Aug 1 0:00 0 S 67Rule Arg 1943 only - Oct 15 0:00 1:00 D 68Rule Arg 1946 only - Mar 1 0:00 0 S 69Rule Arg 1946 only - Oct 1 0:00 1:00 D 70Rule Arg 1963 only - Oct 1 0:00 0 S 71Rule Arg 1963 only - Dec 15 0:00 1:00 D 72Rule Arg 1964 1966 - Mar 1 0:00 0 S 73Rule Arg 1964 1966 - Oct 15 0:00 1:00 D 74Rule Arg 1967 only - Apr 1 0:00 0 S 75Rule Arg 1967 1968 - Oct Sun<=7 0:00 1:00 D 76Rule Arg 1968 1969 - Apr Sun<=7 0:00 0 S 77Rule Arg 1974 only - Jan 23 0:00 1:00 D 78Rule Arg 1974 only - May 1 0:00 0 S 79Rule Arg 1974 1976 - Oct Sun<=7 0:00 1:00 D 80Rule Arg 1975 1977 - Apr Sun<=7 0:00 0 S 81Rule Arg 1985 only - Nov 2 0:00 1:00 D 82Rule Arg 1986 only - Mar 14 0:00 0 S 83Rule Arg 1986 1987 - Oct 25 0:00 1:00 D 84Rule Arg 1987 only - Feb 13 0:00 0 S 85Rule Arg 1988 only - Feb 7 0:00 0 S 86Rule Arg 1988 only - Dec 1 0:00 1:00 D 87# 88# From Hernan G. Otero <hernan@isoft.com.ar> (June 26, 1995): 89# These corrections were contributed by InterSoft Argentina S.A., 90# obtaining the data from the: 91# Talleres de Hidrografia Naval Argentina 92# (Argentinian Naval Hydrography Institute) 93# 94# Shanks gives 1989 Mar 16 and stops after 1990 Mar 4; go with Otero. 95Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 S 96Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 D 97# 98# From Hernan G. Otero <hernan@isoft.com.ar> (June 26, 1995): 99# From this moment on, the law that mandated the daylight saving 100# time corrections was derogated and no more modifications 101# to the time zones (for daylight saving) are now made. 102# 103# Zone NAME GMTOFF RULES FORMAT [UNTIL] 104Zone America/Buenos_Aires -3:53:48 - LMT 1894 Nov 105 -4:17 - CMT 1920 May # Cordoba Mean Time 106 -4:00 - AST 1930 Dec 107 -4:00 Arg A%sT 1969 Oct 5 108 -3:00 Arg AR%sT 109 110# ZONE-DESCR America Buenos_Aires Argentina All points 111 112# Bolivia 113# Zone NAME GMTOFF RULES FORMAT [UNTIL] 114Zone America/La_Paz -4:32:36 - LMT 1890 115 -4:33 - LPMT 1931 Oct 15 # La Paz Mean Time 116 -4:33 1:00 LPDT 1932 Mar 21 117 -4:00 - AST 118 119# ZONE-DESCR America La_Paz Bolivia All points 120 121# Brazil 122 123# From Guy Harris: 124# The OAG lists October 25, 1987 and February 12, 1988 as the starting and 125# ending dates, giving them as "estimated date(s) based on previous year". We 126# infer a rule here from one example, always a dangerous practice.... Yes, 127# they really do switch on Saturday, according to the OAG. 128# "Brazil/Acre" is for the Territory of Acre; "Brazil/DeNoronha" is for 129# Fernando De Noronha. 130 131# From Bob Devine (January 28, 1988): 132# The only information I found is that there was no DST up to 1985. 133# But there was some before 1952! 134 135# From U. S. Naval Observatory (January 16, 1989): 136# BRAZIL WEST 5 H BEHIND UTC TERRITORY OF ACRE 137# BRAZIL WEST 4 H BEHIND UTC ACRE OCT 23, '88-FEB 11, 138# BRAZIL '89 (ESTIMATED) 139# BRAZIL CENTRAL 4 H BEHIND UTC MANAUS 140# BRAZIL CENTRAL 3 H BEHIND UTC MANAUS OCT 23, '88-FEB 11, 141# BRAZIL CENTRAL '89 (ESTIMATED) 142# BRAZIL EAST 3 H BEHIND UTC COASTAL STATES, RIO, SAO 143# BRAZIL EAST PAULO, BRASILIA 144# BRAZIL EAST 2 H BEHIND UTC COASTAL STATES, RIO, SAO 145# BRAZIL PAULO, BRASILIA OCT 23, 146# BRAZIL '88-FEB 11, '89 147# BRAZIL (ESTIMATED) 148# BRAZIL 2 H BEHIND UTC ATLANTIC ISLANDS, FERNANDO 149# BRAZIL DE NORONHA 150# BRAZIL 1 H BEHIND UTC OCT 23, '88-FEB 11, '89 151# BRAZIL (ESTIMATED) 152# BRAZIL 3 H BEHIND UTC FOR MOST MAJOR AIRPORTS. 153 154# From Paul Eggert <eggert@twinsun.com> (November 18, 1993): 155# The mayor of Rio recently attempted to change the time zone rules 156# just in his city, in order to leave more summer time for the tourist trade. 157# The rule change lasted only part of the day; 158# the federal government refused to follow the city's rules, and business 159# was in a chaos, so the mayor backed down that afternoon. 160# Shanks claims Acre stopped observing DST after 1988 Feb 7, but it 161# could just be that his table ran out of room. We're extrapolating 162# about time zone changes after 1990 Feb 11. 163 164# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 165Rule Brazil 1914 only - Jan 1 0:00 0 S 166Rule Brazil 1931 only - Oct 3 11:00 1 D 167Rule Brazil 1932 1933 - Apr 1 0:00 0 S 168Rule Brazil 1932 only - Oct 3 0:00 1 D 169Rule Brazil 1949 1952 - Dec 1 0:00 1 D 170Rule Brazil 1950 only - Apr 16 0:00 0 S 171Rule Brazil 1951 1953 - Apr 1 0:00 0 S 172Rule Brazil 1963 only - Dec 9 0:00 1 D 173Rule Brazil 1964 only - Mar 1 0:00 0 S 174Rule Brazil 1965 only - Jan 31 0:00 1 D 175Rule Brazil 1965 only - Apr 1 0:00 0 S 176Rule Brazil 1965 only - Dec 1 0:00 1 D 177Rule Brazil 1966 1968 - Mar 1 0:00 0 S 178Rule Brazil 1966 1967 - Nov 1 0:00 1 D 179Rule Brazil 1985 only - Nov 2 0:00 1 D 180Rule Brazil 1986 only - Mar 15 0:00 0 S 181Rule Brazil 1986 1987 - Oct Sat<=28 0:00 1 D 182Rule Brazil 1987 only - Feb 14 0:00 0 S 183Rule Brazil 1988 only - Feb 7 0:00 0 S 184Rule Brazil 1989 only - Jan 22 0:00 0 S 185Rule Brazil 1988 max - Oct Sun>=15 0:00 1 D 186Rule Brazil 1990 max - Feb Sun>=8 0:00 0 S 187# Zone NAME GMTOFF RULES FORMAT [UNTIL] 188Zone America/Noronha -2:09:40 - LMT 1914 189 -2:00 - FST 1963 Dec 9 190 -2:00 Brazil F%sT 191Zone America/Sao_Paulo -3:06:28 - LMT 1914 192 -3:00 Brazil E%sT 193Zone America/Manaus -4:00:04 - LMT 1914 194 -4:00 - WST 1963 Dec 9 195 -4:00 Brazil W%sT 196# Rio_Branco is too ambiguous, since there's a Rio Branco in Uruguay too. 197Zone America/Porto_Acre -4:31:12 - LMT 1914 198 -5:00 - AST 1963 Dec 9 199 -5:00 Brazil A%sT 200# 201# Martin Vaz and Trinidade are like America/Noronha. 202 203# ZONE-DESCR America Noronha Brazil Fernando De Noronha 204# ZONE-DESCR America Sao_Paulo Brazil Eastern zone 205# ZONE-DESCR America Manaus Brazil Western zone 206# ZONE-DESCR America Porto_Acre Brazil Territory of Acre 207 208# Chile 209 210# From Guy Harris: 211# The OAG lists October 11, 1987 and March 12, 1988 as the starting and 212# ending dates, giving them as "estimated date(s) based on previous year." 213 214# From Bob Devine (January 28, 1988): 215# Chile has had 2nd Sunday in October to 2nd Sunday in March DST since 1977. 216# Switch is at midnight. OAG is right. 217 218# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 219Rule Chile 1918 only - Sep 1 0:00 1:00 D 220Rule Chile 1919 only - Jul 2 0:00 0 S 221Rule Chile 1927 1931 - Sep 1 0:00 1:00 D 222Rule Chile 1928 1932 - Apr 1 0:00 0 S 223Rule Chile 1969 max - Oct Sun>=8 0:00 1:00 D 224Rule Chile 1970 max - Mar Sun>=8 0:00 0 S 225# Zone NAME GMTOFF RULES FORMAT [UNTIL] 226Zone America/Santiago -4:42:40 - LMT 1890 227 -4:43 - SMT 1910 # Santiago Mean Time 228 -5:00 Chile C%sT 1932 Sep 229 -4:00 Chile C%sT 230Zone Pacific/Easter -7:17:28 - LMT 1890 # Mataveri 231 -7:17 - MMT 1932 Sep # Mataveri Mean Time 232 -7:00 Chile M%sT 1982 Mar 14 233 -6:00 Chile C%sT 234# 235# Whitman says Juan Fernandez Is are like America/Santiago. 236# San Ambrosio, San Felix 237# no information; probably like America/Santiago 238 239# ZONE-DESCR America Santiago Chile All points 240# ZONE-DESCR Pacific Easter Easter_Island All points 241 242# Colombia 243# Zone NAME GMTOFF RULES FORMAT [UNTIL] 244Zone America/Bogota -4:56:20 - LMT 1884 Mar 13 245 -4:56 - BMT 1914 Nov 23 # Bogota Mean Time 246 -5:00 - EST 247# Malpelo, Providencia, San Andres 248# no information; probably like America/Bogota 249 250# ZONE-DESCR America Botoga Colombia All points 251 252# Curacao 253# Zone NAME GMTOFF RULES FORMAT [UNTIL] 254Zone America/Curacao -4:35:44 - LMT 1912 Feb 12 # Willemstad 255 -4:30 - NAST 1965 # Netherlands Antilles 256 -4:00 - AST 257 258# ZONE-DESCR America Curacao Curacao All points 259 260# Ecuador 261# Zone NAME GMTOFF RULES FORMAT [UNTIL] 262Zone America/Guayaquil -5:19:20 - LMT 1890 263 -5:14 - QMT 1931 # Quito Mean Time 264 -5:00 - EST 265Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno 266 -5:00 - EST 1986 267 -6:00 - CST 268 269# ZONE-DESCR America Guayaquil Ecuador All points except: 270# ZONE-DESCR Pacific Galapagos Ecuador Galapagos Islands 271 272# Falklands 273# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 274Rule Falk 1912 only - Mar 12 0:00 0 S 275Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 D 276Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 S 277Rule Falk 1939 only - Oct 1 0:00 1:00 D 278Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 D 279Rule Falk 1943 only - Jan 1 0:00 0 S 280Rule Falk 1983 only - Sep lastSun 0:00 1:00 D 281Rule Falk 1984 1985 - Apr lastSun 0:00 0 S 282Rule Falk 1984 only - Sep 16 0:00 1:00 D 283Rule Falk 1985 max - Sep Sun>=9 0:00 1:00 D 284Rule Falk 1986 max - Apr Sun>=16 0:00 0 S 285# Zone NAME GMTOFF RULES FORMAT [UNTIL] 286Zone Atlantic/Stanley -3:51:24 - LMT 1890 287 -3:51 - SMT 1912 Mar 12 # Stanley Mean Time 288 -4:00 Falk A%sT 1983 May 289 -3:00 Falk E%sT 1985 Sep 15 290 -4:00 Falk A%sT 291 292# ZONE-DESCR Atlantic Stanley Falkland_Islands All points 293 294# French Guiana 295# Zone NAME GMTOFF RULES FORMAT [UNTIL] 296Zone America/Cayenne -3:29:20 - LMT 1911 Jul 297 -4:00 - AST 1967 Oct 298 -3:00 - EST 299 300# ZONE-DESCR America Cayenne French_Guiana All points 301 302# Guyana 303# Zone NAME GMTOFF RULES FORMAT [UNTIL] 304Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown 305 -3:45 - BGST 1975 Jul 31 # British Guiana ST 306 -3:00 - EST 307 308# ZONE-DESCR America Guyana Guyana All points 309 310# Paraguay 311 312# From Bob Devine (January 28, 1988): 313# Paraguay: First day in October to last in March. Midnight switch?? 314# Since 1980. 315 316# From U. S. Naval Observatory (January 19, 1989): 317# PARAGUAY 4 H BEHIND UTC 318# PARAGUAY 3 H BEHIND UTC OCT 1, '88-MAR 31, '89 319 320# From Shanks (1991): 321# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 322Rule Para 1974 only - Apr 1 0:00 0 S 323Rule Para 1975 1978 - Oct 1 0:00 1:00 D 324Rule Para 1975 1978 - Mar 1 0:00 0 S 325# Shanks says 1979 was all DST. 326Rule Para 1980 max - Apr 1 0:00 0 S 327Rule Para 1980 1988 - Oct 1 0:00 1:00 D 328Rule Para 1989 only - Oct 22 0:00 1:00 D 329Rule Para 1990 max - Oct 1 0:00 1:00 D 330# Zone NAME GMTOFF RULES FORMAT [UNTIL] 331Zone America/Asuncion -3:50:40 - LMT 1890 332 -3:51 - AMT 1931 Oct 10 # Asuncion Mean Time 333 -4:00 - AST 1972 Oct 334 -3:00 - EST 1974 Apr 335 -4:00 Para A%sT 336 337# ZONE-DESCR America Asuncion Paraguay All points 338 339# Peru 340# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 341Rule Peru 1908 only - Jul 28 0:00 0 S 342Rule Peru 1938 only - Jan 1 0:00 1:00 D 343Rule Peru 1938 only - Apr 1 0:00 0 S 344Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 D 345Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 S 346Rule Peru 1987 only - Jan 1 0:00 1:00 D 347Rule Peru 1987 only - Apr 1 0:00 0 S 348Rule Peru 1990 only - Jan 1 0:00 1:00 D 349Rule Peru 1990 only - Apr 1 0:00 0 S 350# Zone NAME GMTOFF RULES FORMAT [UNTIL] 351Zone America/Lima -5:08:12 - LMT 1890 352 -5:09 - LMT 1908 Jul 28 353 -5:00 Peru E%sT 354 355# ZONE-DESCR America Lima Peru All points 356 357# South Georgia 358# Zone NAME GMTOFF RULES FORMAT [UNTIL] 359Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken 360 -2:00 - FST 361 362# ZONE-DESCR Atlantic South_Georgia South_Georgia All points 363 364# South Sandwich Is 365# no information 366 367# Suriname 368# Zone NAME GMTOFF RULES FORMAT [UNTIL] 369Zone America/Paramaribo -3:40:40 - LMT 1911 370 -3:40:52 - PMT 1935 # Paramaribo Mean Time 371 -3:40:36 - PMT 1945 Oct # The capital moved? 372 -3:30 - DGST 1984 Oct # Dutch Guiana Std Time 373 -3:00 - EST 374 375# ZONE-DESCR America Paramaibo Suriname All points 376 377# Trinidad and Tobago 378# Zone NAME GMTOFF RULES FORMAT [UNTIL] 379Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2 380 -4:00 - AST 381 382# ZONE-DESCR America Port_of_Spain Trinidad_and_Tobago All points 383 384# Uruguay 385# From Paul Eggert <eggert@twinsun.com> (November 18, 1993): 386# Uruguay wins the prize for the strangest peacetime manipulation of the rules. 387# Your guess is as good as mine for what happened after 1989. 388# From Shanks (1991): 389# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S 390Rule Uruguay 1920 only - May 1 0:00 0 S 391# Whitman gives 1923 Oct 1; go with Shanks. 392Rule Uruguay 1923 only - Oct 2 0:00 0:30 HD 393Rule Uruguay 1924 1926 - Apr 1 0:00 0 S 394Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HD 395Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HD 396# Shanks gives 1935 Apr 1 0:00 and 1936 Mar 30 0:00; go with Whitman. 397Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 S 398Rule Uruguay 1936 only - Nov 1 0:00 0:30 HD 399Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 S 400# Whitman gives 1937 Oct 3; go with Shanks. 401Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HD 402# Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13, 403# and 1943 Apr 13 ``to present time''; go with Shanks. 404Rule Uruguay 1941 only - Aug 1 0:00 0 S 405Rule Uruguay 1942 only - Jan 1 0:00 0:30 HD 406Rule Uruguay 1942 only - Dec 14 0:00 1:00 D 407Rule Uruguay 1943 only - Mar 14 0:00 0 S 408Rule Uruguay 1959 only - May 24 0:00 1:00 D 409Rule Uruguay 1959 only - Nov 15 0:00 0 S 410Rule Uruguay 1960 only - Jan 17 0:00 1:00 D 411Rule Uruguay 1960 only - Mar 6 0:00 0 S 412Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 D 413Rule Uruguay 1965 only - Sep 26 0:00 0 S 414Rule Uruguay 1966 1967 - Oct 31 0:00 0 S 415Rule Uruguay 1968 1970 - May 27 0:00 0:30 HD 416Rule Uruguay 1968 1970 - Dec 2 0:00 0 S 417Rule Uruguay 1972 only - Apr 24 0:00 1:00 D 418Rule Uruguay 1972 only - Aug 15 0:00 0 S 419Rule Uruguay 1974 only - Mar 10 0:00 0:30 HD 420Rule Uruguay 1974 only - Dec 22 0:00 1:00 D 421Rule Uruguay 1976 only - Oct 1 0:00 0 S 422Rule Uruguay 1977 only - Dec 4 0:00 1:00 D 423Rule Uruguay 1978 only - Apr 1 0:00 0 S 424Rule Uruguay 1979 only - Oct 1 0:00 1:00 D 425Rule Uruguay 1980 only - May 1 0:00 0 S 426Rule Uruguay 1987 only - Dec 14 0:00 1:00 D 427Rule Uruguay 1988 only - Mar 14 0:00 0 S 428Rule Uruguay 1988 only - Dec 11 0:00 1:00 D 429Rule Uruguay 1989 only - Mar 12 0:00 0 S 430Rule Uruguay 1989 only - Oct 29 0:00 1:00 D 431Rule Uruguay 1990 only - Mar 4 0:00 0 S 432# Zone NAME GMTOFF RULES FORMAT [UNTIL] 433Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28 434 -3:45 - MMT 1920 May 1 # Montevideo MT 435 -3:30 Uruguay U%sT 1942 Dec 14 # Uruguay ST 436 -3:00 Uruguay E%sT 437 438# ZONE-DESCR America Montevideo Uruguay All points 439 440# Venezuela 441# Zone NAME GMTOFF RULES FORMAT [UNTIL] 442Zone America/Caracas -4:27:44 - LMT 1890 443 -4:28 - CMT 1912 Feb 12 # Caracas Mean Time 444 -4:30 - VZT 1965 # Venezuela Time 445 -4:00 - AST 446 447# ZONE-DESCR America Caracas Venezuela All points 448