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1 # @(#)southamerica 7.33
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).
7 # From Paul Eggert <eggert@twinsun.com> (1999-07-07):
8 # A good source for time zone historical data outside the U.S. is
9 # Thomas G. Shanks, The International Atlas (5th edition),
10 # San Diego: ACS Publications, Inc. (1999).
11 #
12 # Gwillim Law <LAW@encmail.encompass.com> writes that a good source
13 # for recent time zone data is the International Air Transport
14 # Association's Standard Schedules Information Manual (IATA SSIM),
15 # published semiannually. Law sent in several helpful summaries
16 # of the IATA's data after 1990.
17 #
18 # Except where otherwise noted, Shanks is the source for entries through 1990,
19 # and IATA SSIM is the source for entries after 1990.
20 #
21 # Earlier editions of these tables used the North American style (e.g. ARST and
22 # ARDT for Argentine Standard and Daylight Time), but the following quote
23 # suggests that it's better to use European style (e.g. ART and ARST).
24 # I suggest the use of _Summer time_ instead of the more cumbersome
25 # _daylight-saving time_. _Summer time_ seems to be in general use
26 # in Europe and South America.
27 # -- E O Cutler, _New York Times_ (1937-02-14), quoted in
28 # H L Mencken, _The American Language: Supplement I_ (1960), p 466
29 #
30 # Earlier editions of these tables also used the North American style
31 # for time zones in Brazil, but this was incorrect, as Brazilians say
32 # "summer time". Reinaldo Goulart, a Sao Paulo businessman active in
33 # the railroad sector, writes (1999-07-06):
34 # The subject of time zones is currently a matter of discussion/debate in
35 # Brazil. Let's say that "the Brasilia time" is considered the
36 # "official time" because Brasilia is the capital city.
37 # The other three time zones are called "Brasilia time "minus one" or
38 # "plus one" or "plus two". As far as I know there is no such
39 # name/designation as "Eastern Time" or "Central Time".
40 # So I invented the following (English-language) abbreviations for now.
41 # Corrections are welcome!
42 # std dst
43 # -2:00 FNT FNST Fernando de Noronha
44 # -3:00 BRT BRST Brasilia
45 # -4:00 AMT AMST Amazon
46 # -5:00 ACT ACST Acre
48 ###############################################################################
50 ###############################################################################
52 # Argentina
54 # From Bob Devine (1988-01-28):
55 # Argentina: first Sunday in October to first Sunday in April since 1976.
56 # Double Summer time from 1969 to 1974. Switches at midnight.
58 # From U. S. Naval Observatory (1988-01-199):
59 # ARGENTINA 3 H BEHIND UTC
61 # From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26):
62 # I am sending modifications to the Argentine time zone table...
63 # AR was chosen because they are the ISO letters that represent Argentina.
65 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
66 Rule Arg 1930 only - Dec 1 0:00 1:00 S
67 Rule Arg 1931 only - Apr 1 0:00 0 -
68 Rule Arg 1931 only - Oct 15 0:00 1:00 S
69 Rule Arg 1932 1940 - Mar 1 0:00 0 -
70 Rule Arg 1932 1939 - Nov 1 0:00 1:00 S
71 Rule Arg 1940 only - Jul 1 0:00 1:00 S
72 Rule Arg 1941 only - Jun 15 0:00 0 -
73 Rule Arg 1941 only - Oct 15 0:00 1:00 S
74 Rule Arg 1943 only - Aug 1 0:00 0 -
75 Rule Arg 1943 only - Oct 15 0:00 1:00 S
76 Rule Arg 1946 only - Mar 1 0:00 0 -
77 Rule Arg 1946 only - Oct 1 0:00 1:00 S
78 Rule Arg 1963 only - Oct 1 0:00 0 -
79 Rule Arg 1963 only - Dec 15 0:00 1:00 S
80 Rule Arg 1964 1966 - Mar 1 0:00 0 -
81 Rule Arg 1964 1966 - Oct 15 0:00 1:00 S
82 Rule Arg 1967 only - Apr 1 0:00 0 -
83 Rule Arg 1967 1968 - Oct Sun<=7 0:00 1:00 S
84 Rule Arg 1968 1969 - Apr Sun<=7 0:00 0 -
85 Rule Arg 1974 only - Jan 23 0:00 1:00 S
86 Rule Arg 1974 only - May 1 0:00 0 -
87 Rule Arg 1974 1976 - Oct Sun<=7 0:00 1:00 S
88 Rule Arg 1975 1977 - Apr Sun<=7 0:00 0 -
89 Rule Arg 1985 only - Nov 2 0:00 1:00 S
90 Rule Arg 1986 only - Mar 14 0:00 0 -
91 Rule Arg 1986 1987 - Oct 25 0:00 1:00 S
92 Rule Arg 1987 only - Feb 13 0:00 0 -
93 Rule Arg 1988 only - Feb 7 0:00 0 -
94 Rule Arg 1988 only - Dec 1 0:00 1:00 S
95 #
96 # From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26):
97 # These corrections were contributed by InterSoft Argentina S.A.,
98 # obtaining the data from the:
99 # Talleres de Hidrografia Naval Argentina
100 # (Argentine Naval Hydrography Institute)
101 #
102 # Shanks stops after 1992-03-01; go with Otero.
103 Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 -
104 Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 S
105 #
106 # From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26):
107 # From this moment on, the law that mandated the daylight saving
108 # time corrections was derogated and no more modifications
109 # to the time zones (for daylight saving) are now made.
110 #
111 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
112 #
113 # Buenos Aires (BA), Distrito Federal (DF), Santa Cruz (SC),
114 # Tierra del Fuego (TF) & Antartida e Islas
115 Zone America/Buenos_Aires -3:53:48 - LMT 1894 Nov
116 -4:16:44 - CMT 1920 May # Cordoba Mean Time
117 -4:00 - ART 1930 Dec
118 -4:00 Arg AR%sT 1969 Oct 5
119 -3:00 Arg AR%sT
120 #
121 # Santa Fe (SF), Entre Rios (ER), Corrientes (CN), Misiones (MN), Chaco (CC),
122 # Formosa (FM), La Pampa (LP), Chubut (CH)
123 Zone America/Rosario -4:02:40 - LMT 1894 Nov
124 -4:16:44 - CMT 1920 May
125 -4:00 - ART 1930 Dec
126 -4:00 Arg AR%sT 1969 Oct 5
127 -3:00 Arg AR%sT 1991 Jul
128 -3:00 - ART
129 #
130 # Cordoba (CB), Santiago del Estero (SE), Salta (SA), Tucuman (TM), La Rioja (LR), San Juan (SJ), San Luis (SL),
131 # Neuquen (NQ), Rio Negro (RN)
132 Zone America/Cordoba -4:16:44 - LMT 1894 Nov
133 -4:16:44 - CMT 1920 May
134 -4:00 - ART 1930 Dec
135 -4:00 Arg AR%sT 1969 Oct 5
136 -3:00 Arg AR%sT 1990 Jul
137 -3:00 - ART
138 #
139 # Jujuy (JY)
140 Zone America/Jujuy -4:21:12 - LMT 1894 Nov
141 -4:16:44 - CMT 1920 May
142 -4:00 - ART 1930 Dec
143 -4:00 Arg AR%sT 1969 Oct 5
144 -3:00 Arg AR%sT 1991 Mar 3
145 -4:00 - WART 1991 Oct 6
146 -4:00 1:00 WARST 1992 Mar 15
147 -4:00 - WART 1992 Oct 18
148 -3:00 - ART
149 #
150 # Catamarca (CT)
151 Zone America/Catamarca -4:23:08 - LMT 1894 Nov
152 -4:16:44 - CMT 1920 May
153 -4:00 - ART 1930 Dec
154 -4:00 Arg AR%sT 1969 Oct 5
155 -3:00 Arg AR%sT 1990 Jul
156 -3:00 - ART 1991 Jul
157 -3:00 Arg AR%sT 1992 Jul
158 -3:00 - ART
159 #
160 # Mendoza (MZ)
161 Zone America/Mendoza -4:35:16 - LMT 1894 Nov
162 -4:16:44 - CMT 1920 May
163 -4:00 - ART 1930 Dec
164 -4:00 Arg AR%sT 1969 Oct 5
165 -3:00 Arg AR%sT 1991 Mar 3
166 -4:00 - WART 1991 Oct 15
167 -4:00 1:00 WARST 1992 Mar 1
168 -4:00 - WART 1992 Oct 18
169 -3:00 - ART
171 # Aruba
172 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
173 Zone America/Aruba -4:40:24 - LMT 1912 Feb 12 # Oranjestad
174 -4:30 - ANT 1965 # Netherlands Antilles Time
175 -4:00 - AST
177 # Bolivia
178 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
179 Zone America/La_Paz -4:32:36 - LMT 1890
180 -4:32:36 - LPMT 1931 Oct 15 # La Paz Mean Time
181 -4:32:36 1:00 BOST 1932 Mar 21 # Bolivia ST
182 -4:00 - BOT # Bolivia Time
184 # Brazil
186 # From Paul Eggert <eggert@twinsun.com> (1993-11-18):
187 # The mayor of Rio recently attempted to change the time zone rules
188 # just in his city, in order to leave more summer time for the tourist trade.
189 # The rule change lasted only part of the day;
190 # the federal government refused to follow the city's rules, and business
191 # was in a chaos, so the mayor backed down that afternoon.
193 # From IATA SSIM (1996-02):
194 # _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS),
195 # Santa Catarina (SC), Parana (PR), Sao Paulo (SP), Rio de Janeiro (RJ),
196 # Espirito Santo (ES), Minas Gerais (MG), Bahia (BA), Goias (GO),
197 # Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL].
198 # [The last three states are new to this issue of the IATA SSIM.]
200 # From Gwillim Law (1996-10-07):
201 # Geography, history (Tocantins was part of Goias until 1989), and other
202 # sources of time zone information lead me to believe that AL, SE, and TO were
203 # always in BR1, and so the only change was whether or not they observed DST....
204 # The earliest issue of the SSIM I have is 2/91. Each issue from then until
205 # 9/95 says that DST is observed only in the ten states I quoted from 9/95,
206 # along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2
207 # (UTC-4).... The other two time zones given for Brazil are BR3, which is
208 # UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is
209 # UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's
210 # become part of the state of Pernambuco). The boundary between BR1 and BR2
211 # has never been clearly stated. They've simply been called East and West.
212 # However, some conclusions can be drawn from another IATA manual: the Airline
213 # Coding Directory, which lists close to 400 airports in Brazil. For each
214 # airport it gives a time zone which is coded to the SSIM. From that
215 # information, I'm led to conclude that the states of Amapa (AP), Ceara (CE),
216 # Maranhao (MA), Paraiba (PR), Pernambuco (PE), Piaui (PI), and Rio Grande do
217 # Norte (RN), and the eastern part of Para (PA) are all in BR1 without DST.
219 # From Marcos Tadeu (1998-09-27):
220 # <a href="http://pcdsh01.on.br/verao1.html">
221 # Brazilian official page
222 # </a>
223 #
224 # From Paul Eggert (1998-10-29):
225 # The official decrees referenced below are taken from
226 # <a href="http://pcdsh01.on.br/DecHV.html">
227 # Decretos sobre o Horario de Verao no Brasil
228 # </a> (1999-10-04, in Portuguese).
230 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
231 # Decree <a href="http://pcdsh01.on.br/HV20466.htm">20,466</a> (1931-10-01)
232 # Decree <a href="http://pcdsh01.on.br/HV21896.htm">21,896</a> (1932-01-10)
233 Rule Brazil 1931 only - Oct 3 11:00 1:00 S
234 Rule Brazil 1932 1933 - Apr 1 0:00 0 -
235 Rule Brazil 1932 only - Oct 3 0:00 1:00 S
236 # Decree <a href="http://pcdsh01.on.br/HV23195.htm">23,195</a> (1933-10-10)
237 # revoked DST.
238 # Decree <a href="http://pcdsh01.on.br/HV27496.htm">27,496</a> (1949-11-24)
239 # Decree <a href="http://pcdsh01.on.br/HV27998.htm">27,998</a> (1950-04-13)
240 Rule Brazil 1949 1952 - Dec 1 0:00 1:00 S
241 Rule Brazil 1950 only - Apr 16 1:00 0 -
242 Rule Brazil 1951 1952 - Apr 1 0:00 0 -
243 # Decree <a href="http://pcdsh01.on.br/HV32308.htm">32,308</a> (1953-02-24)
244 Rule Brazil 1953 only - Mar 1 0:00 0 -
245 # Decree <a href="http://pcdsh01.on.br/HV34724.htm">34,724</a> (1953-11-30)
246 # revoked DST.
247 # Decree <a href="http://pcdsh01.on.br/HV52700.htm">52,700</a> (1963-10-18)
248 # established DST from 1963-10-23 00:00 to 1964-02-29 00:00
249 # in SP, RJ, GB, MG, ES, due to the prolongation of the drought.
250 # Decree <a href="http://pcdsh01.on.br/HV53071.htm">53,071</a> (1963-12-03)
251 # extended the above decree to all of the national territory on 12-09.
252 Rule Brazil 1963 only - Dec 9 0:00 1:00 S
253 # Decree <a href="http://pcdsh01.on.br/HV53604.htm">53,604</a> (1964-02-25)
254 # extended summer time by one day to 1964-03-01 00:00 (start of school).
255 Rule Brazil 1964 only - Mar 1 0:00 0 -
256 # Decree <a href="http://pcdsh01.on.br/HV55639.htm">55,639</a> (1965-01-27)
257 Rule Brazil 1965 only - Jan 31 0:00 1:00 S
258 Rule Brazil 1965 only - Mar 31 0:00 0 -
259 # Decree <a href="http://pcdsh01.on.br/HV57303.htm">57,303</a> (1965-11-22)
260 Rule Brazil 1965 only - Dec 1 0:00 1:00 S
261 # Decree <a href="http://pcdsh01.on.br/HV57843.htm">57,843</a> (1966-02-18)
262 Rule Brazil 1966 1968 - Mar 1 0:00 0 -
263 Rule Brazil 1966 1967 - Nov 1 0:00 1:00 S
264 # Decree <a href="http://pcdsh01.on.br/HV63429.htm">63,429</a> (1968-10-15)
265 # revoked DST.
266 # Decree <a href="http://pcdsh01.on.br/HV91698.htm">91,698</a> (1985-09-27)
267 Rule Brazil 1985 only - Nov 2 0:00 1:00 S
268 # Decree 92,310 (1986-01-21)
269 # Decree 92,463 (1986-03-13)
270 Rule Brazil 1986 only - Mar 15 0:00 0 -
271 # Decree 93,316 (1986-10-01)
272 Rule Brazil 1986 only - Oct 25 0:00 1:00 S
273 Rule Brazil 1987 only - Feb 14 0:00 0 -
274 # Decree <a href="http://pcdsh01.on.br/HV94922.htm">94,922</a> (1987-09-22)
275 Rule Brazil 1987 only - Oct 25 0:00 1:00 S
276 Rule Brazil 1988 only - Feb 7 0:00 0 -
277 # Decree <a href="http://pcdsh01.on.br/HV96676.htm">96,676</a> (1988-09-12)
278 # except for the states of AC, AM, PA, RR, RO, and AP (then a territory)
279 Rule Brazil 1988 only - Oct 16 0:00 1:00 S
280 Rule Brazil 1989 only - Jan 29 0:00 0 -
281 # Decree <a href="http://pcdsh01.on.br/HV98077.htm">98,077</a> (1989-08-21)
282 # with the same exceptions
283 Rule Brazil 1989 only - Oct 15 0:00 1:00 S
284 Rule Brazil 1990 only - Feb 11 0:00 0 -
285 # Decree <a href="http://pcdsh01.on.br/HV99530.htm">99,530</a> (1990-09-17)
286 # adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF.
287 # Decree 99,629 (1990-10-19) adds BA, MT.
288 Rule Brazil 1990 only - Oct 21 0:00 1:00 S
289 Rule Brazil 1991 only - Feb 17 0:00 0 -
290 # <a href="http://pcdsh01.on.br/HV1991.htm">Unnumbered decree</a> (1991-09-25)
291 # adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF.
292 Rule Brazil 1991 only - Oct 20 0:00 1:00 S
293 Rule Brazil 1992 only - Feb 9 0:00 0 -
294 # <a href="http://pcdsh01.on.br/HV1992.htm">Unnumbered decree</a> (1992-10-16)
295 # adopted by same states.
296 Rule Brazil 1992 only - Oct 25 0:00 1:00 S
297 Rule Brazil 1993 only - Jan 31 0:00 0 -
298 # Decree <a href="http://pcdsh01.on.br/HV942.htm">942</a> (1993-09-28)
299 # adopted by same states, plus AM.
300 # Decree <a href="http://pcdsh01.on.br/HV1252.htm">1,252</a> (1994-09-22)
301 # adopted by same states, minus AM.
302 # Decree <a href="http://pcdsh01.on.br/HV1636.htm">1,636</a> (1995-09-14)
303 # adopted by same states, plus TO.
304 # Decree <a href="http://pcdsh01.on.br/HV1674.htm">1,674</a> (1995-10-13)
305 # adds AL, SE.
306 Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 S
307 Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 -
308 Rule Brazil 1996 only - Feb 11 0:00 0 -
309 # Decree <a href="http://pcdsh01.on.br/HV2000.htm">2,000</a> (1996-09-04)
310 # adopted by same states, minus AL, SE.
311 Rule Brazil 1996 only - Oct 6 0:00 1:00 S
312 Rule Brazil 1997 only - Feb 16 0:00 0 -
313 # From Daniel C. Sobral <dcs@gns.com.br> (1998-02-12):
314 # In 1997, the DS began on October 6. The stated reason was that
315 # because international television networks ignored Brazil's policy on DS,
316 # they bought the wrong times on satellite for coverage of Pope's visit.
317 # This year, the ending date of DS was postponed to March 1
318 # to help dealing with the shortages of electric power.
319 #
320 # From Paul Eggert (1998-02-25):
321 # <a href="http://churchnet.ucsm.ac.uk/news/files2/news165.htm">
322 # Brazil Prepares for Papal Visit
323 # </a>,
324 # Church Net UK (1997-10-02).
325 #
326 # Decree 2,317 (1997-09-04), adopted by same states.
327 Rule Brazil 1997 only - Oct 6 0:00 1:00 S
328 # Decree <a href="http://pcdsh01.on.br/figuras/HV2495.JPG">2,495</a>
329 # (1998-02-10)
330 Rule Brazil 1998 only - Mar 1 0:00 0 -
331 # Decree <a href="http://pcdsh01.on.br/figuras/Hv98.jpg">2,780</a> (1998-09-11)
332 # adopted by the same states as before.
333 Rule Brazil 1998 only - Oct 11 0:00 1:00 S
334 Rule Brazil 1999 only - Feb 21 0:00 0 -
335 # Decree <a href="http://pcdsh01.on.br/figuras/HV3150.gif">3,150</a>
336 # (1999-08-23) adopted by same states.
337 # Decree <a href="http://pcdsh01.on.br/DecHV99.gif">3,188</a> (1999-09-30)
338 # adds SE, AL, PE, PR, RN, CE, PI, MA and RR.
339 # These give only one year's rules. After that, the rules are guesses
340 # and are quite possibly wrong, but are more likely than no DST at all.
341 Rule Brazil 1999 max - Oct Sun>=1 0:00 1:00 S
342 Rule Brazil 2000 max - Feb lastSun 0:00 0 -
345 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
346 #
347 # Fernando de Noronha
348 Zone America/Noronha -2:09:40 - LMT 1914
349 -2:00 Brazil FN%sT 1990 Sep 17
350 -2:00 - FNT
351 #
352 # Amapa (AP), east Para (PA)
353 Zone America/Belem -3:13:56 - LMT 1914
354 -3:00 Brazil BR%sT 1988 Sep 12
355 -3:00 - BRT
356 #
357 # Maranhao (MA), Piaui (PI), Ceara (CE), Rio Grande do Norte (RN),
358 # Paraiba (PB), Pernambuco (PE) (except Fernando de Noronha)
359 Zone America/Fortaleza -2:34:00 - LMT 1914
360 -3:00 Brazil BR%sT 1990 Sep 17
361 -3:00 - BRT 1999 Sep 30
362 -3:00 Brazil BR%sT
363 #
364 # Tocantins (TO)
365 Zone America/Araguaina -3:12:48 - LMT 1914
366 -3:00 Brazil BR%sT 1990 Sep 17
367 -3:00 - BRT 1995 Sep 14
368 -3:00 Brazil BR%sT
369 #
370 # Alagoas (AL), Sergipe (SE)
371 Zone America/Maceio -2:22:52 - LMT 1914
372 -3:00 Brazil BR%sT 1990 Sep 17
373 -3:00 - BRT 1995 Oct 13
374 -3:00 Brazil BR%sT 1996 Sep 4
375 -3:00 - BRT 1999 Sep 30
376 -3:00 Brazil BR%sT
377 #
378 # Bahia (BA), Goias (GO), Distrito Federal (DF), Minas Gerais (MG),
379 # Espirito Santo (ES), Rio de Janeiro (RJ), Sao Paulo (SP), Parana (PR),
380 # Santa Catarina (SC), Rio Grande do Sul (RS)
381 Zone America/Sao_Paulo -3:06:28 - LMT 1914
382 -3:00 Brazil BR%sT 1963 Oct 23 00:00
383 -3:00 1:00 BRST 1964
384 -3:00 Brazil BR%sT
385 #
386 # Mato Grosso, Mato Grosso do Sul
387 Zone America/Cuiaba -3:44:20 - LMT 1914
388 -4:00 Brazil AM%sT
389 #
390 # west Para (PA), Rondonia (RO)
391 Zone America/Porto_Velho -4:15:36 - LMT 1914
392 -4:00 Brazil AM%sT 1988 Sep 12
393 -4:00 - AMT
394 #
395 # Roraima (RR)
396 Zone America/Boa_Vista -4:02:40 - LMT 1914
397 -4:00 Brazil AM%sT 1988 Sep 12
398 -4:00 - AMT 1999 Sep 30
399 -4:00 Brazil AM%sT
400 #
401 # Amazonas (AM)
402 Zone America/Manaus -4:00:04 - LMT 1914
403 -4:00 Brazil AM%sT 1988 Sep 12
404 -4:00 - AMT 1993 Sep 28
405 -4:00 Brazil AM%sT 1994 Sep 22
406 -4:00 - AMT
407 #
408 # Acre (AC)
409 # Rio_Branco is too ambiguous, since there's a Rio Branco in Uruguay too.
410 Zone America/Porto_Acre -4:31:12 - LMT 1914
411 -5:00 Brazil AC%sT 1988 Sep 12
412 -5:00 - ACT
413 #
414 # Martin Vaz and Trinidade are like America/Noronha.
417 # Chile
419 # From Eduardo Krell (1995-10-19):
420 # The law says to switch to DST at midnight [24:00] on the second SATURDAY
421 # of October.... The law is the same for March and October.
422 # (1998-09-29):
423 # Because of the drought this year, the government decided to go into
424 # DST earlier (saturday 9/26 at 24:00). This is a one-time change only ...
425 # (unless there's another dry season next year, I guess).
427 # From Julio I. Pacheco Troncoso (1999-03-18):
428 # Because of the same drought, the government decided to end DST later,
429 # on April 3, (one-time change).
431 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
432 Rule Chile 1918 only - Sep 1 0:00 1:00 S
433 Rule Chile 1919 only - Jul 2 0:00 0 -
434 Rule Chile 1927 1931 - Sep 1 0:00 1:00 S
435 Rule Chile 1928 1932 - Apr 1 0:00 0 -
436 Rule Chile 1969 1997 - Oct Sun>=9 0:00 1:00 S
437 Rule Chile 1970 1998 - Mar Sun>=9 0:00 0 -
438 Rule Chile 1998 only - Sep 27 0:00 1:00 S
439 Rule Chile 1999 only - Apr 4 0:00 0 -
440 Rule Chile 1999 max - Oct Sun>=9 0:00 1:00 S
441 Rule Chile 2000 max - Mar Sun>=9 0:00 0 -
442 # IATA SSIM anomalies: (1990-09) says 1990-09-16; (1992-02) says 1992-03-14;
443 # (1996-09) says 1998-03-08. Ignore these.
444 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
445 Zone America/Santiago -4:42:40 - LMT 1890
446 -4:42:40 - SMT 1910 # Santiago Mean Time
447 -5:00 Chile CL%sT 1932 Sep # Chile Time
448 -4:00 Chile CL%sT
449 Zone Pacific/Easter -7:17:28 - LMT 1890 # Mataveri
450 -7:17:28 - MMT 1932 Sep # Mataveri Mean Time
451 -7:00 Chile EAS%sT 1982 Mar 14 # Easter I Time
452 -6:00 Chile EAS%sT
453 #
454 # Whitman says Juan Fernandez Is are like America/Santiago.
455 # San Ambrosio, San Felix
456 # no information; probably like America/Santiago
459 # Colombia
460 # Shanks specifies 24:00 for 1992 transition times; go with IATA,
461 # as it seems implausible to change clocks at midnight New Year's Eve.
462 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
463 Rule CO 1992 only - May 2 0:00 1:00 S
464 Rule CO 1992 only - Dec 31 0:00 0 -
465 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
466 Zone America/Bogota -4:56:20 - LMT 1884 Mar 13
467 -4:56:20 - BMT 1914 Nov 23 # Bogota Mean Time
468 -5:00 CO CO%sT # Colombia Time
469 # Malpelo, Providencia, San Andres
470 # no information; probably like America/Bogota
472 # Curacao
473 # Shanks says that Bottom and Oranjestad have been at -4:00 since
474 # standard time was introduced on 1912-03-02; and that Kralendijk and Rincon
475 # used Kralendijk Mean Time (-4:33:08) from 1912-02-02 to 1965-01-01.
476 # This all predates our 1970 cutoff, though.
477 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
478 Zone America/Curacao -4:35:44 - LMT 1912 Feb 12 # Willemstad
479 -4:30 - ANT 1965 # Netherlands Antilles Time
480 -4:00 - AST
482 # Ecuador
483 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
484 Zone America/Guayaquil -5:19:20 - LMT 1890
485 -5:14:00 - QMT 1931 # Quito Mean Time
486 -5:00 - ECT # Ecuador Time
487 Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno
488 -5:00 - ECT 1986
489 -6:00 - GALT # Galapagos Time
491 # Falklands
492 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
493 Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 S
494 Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 -
495 Rule Falk 1939 only - Oct 1 0:00 1:00 S
496 Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 S
497 Rule Falk 1943 only - Jan 1 0:00 0 -
498 Rule Falk 1983 only - Sep lastSun 0:00 1:00 S
499 Rule Falk 1984 1985 - Apr lastSun 0:00 0 -
500 Rule Falk 1984 only - Sep 16 0:00 1:00 S
501 Rule Falk 1985 1995 - Sep Sun>=9 0:00 1:00 S
502 Rule Falk 1986 max - Apr Sun>=16 0:00 0 -
503 Rule Falk 1996 max - Sep Sun>=8 0:00 1:00 S
504 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
505 Zone Atlantic/Stanley -3:51:24 - LMT 1890
506 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time
507 -4:00 Falk FK%sT 1983 May # Falkland Is Time
508 -3:00 Falk FK%sT 1985 Sep 15
509 -4:00 Falk FK%sT
511 # French Guiana
512 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
513 Zone America/Cayenne -3:29:20 - LMT 1911 Jul
514 -4:00 - GFT 1967 Oct # French Guiana Time
515 -3:00 - GFT
517 # Guyana
518 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
519 Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown
520 -3:45 - GBGT 1966 May 26 # Br Guiana Time
521 -3:45 - GYT 1975 Jul 31 # Guyana Time
522 -3:00 - GYT 1991
523 # IATA SSIM (1996-06) says -4:00. Assume a 1991 switch.
524 -4:00 - GYT
526 # Paraguay
527 # From Paul Eggert (1999-10-29):
528 # Shanks (1999) says that spring transitions are from 01:00 -> 02:00,
529 # and autumn transitions are from 00:00 -> 23:00. Go with earlier
530 # editions of Shanks, and with the IATA, who say transitions occur at 00:00.
531 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
532 Rule Para 1975 1988 - Oct 1 0:00 1:00 S
533 Rule Para 1975 1978 - Mar 1 0:00 0 -
534 Rule Para 1979 1991 - Apr 1 0:00 0 -
535 Rule Para 1989 only - Oct 22 0:00 1:00 S
536 Rule Para 1990 only - Oct 1 0:00 1:00 S
537 Rule Para 1991 only - Oct 6 0:00 1:00 S
538 Rule Para 1992 only - Mar 1 0:00 0 -
539 Rule Para 1992 only - Oct 5 0:00 1:00 S
540 Rule Para 1993 only - Mar 31 0:00 0 -
541 Rule Para 1993 1995 - Oct 1 0:00 1:00 S
542 Rule Para 1994 1995 - Feb lastSun 0:00 0 -
543 Rule Para 1996 only - Mar 1 0:00 0 -
544 # IATA SSIM (1997-09) says Mar 1; go with Shanks.
545 Rule Para 1997 only - Feb lastSun 0:00 0 -
546 Rule Para 1998 only - Mar 1 0:00 0 -
547 Rule Para 1996 max - Oct Sun>=1 0:00 1:00 S
548 # IATA SSIM (1999-02) says lastSat, not lastSun; go with Shanks.
549 Rule Para 1999 max - Feb lastSun 0:00 0 -
550 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
551 Zone America/Asuncion -3:50:40 - LMT 1890
552 -3:50:40 - AMT 1931 Oct 10 # Asuncion Mean Time
553 -4:00 - PYT 1972 Oct # Paraguay Time
554 -3:00 - PYT 1974 Apr
555 -4:00 Para PY%sT
557 # Peru
558 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
559 Rule Peru 1938 only - Jan 1 0:00 1:00 S
560 Rule Peru 1938 only - Apr 1 0:00 0 -
561 Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 S
562 Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 -
563 Rule Peru 1987 only - Jan 1 0:00 1:00 S
564 Rule Peru 1987 only - Apr 1 0:00 0 -
565 Rule Peru 1990 only - Jan 1 0:00 1:00 S
566 Rule Peru 1990 only - Apr 1 0:00 0 -
567 # IATA is ambiguous for 1993/1995; go with Shanks.
568 Rule Peru 1994 only - Jan 1 0:00 1:00 S
569 Rule Peru 1994 only - Apr 1 0:00 0 -
570 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
571 Zone America/Lima -5:08:12 - LMT 1890
572 -5:09 - LMT 1908 Jul 28 # Lima Mean Time
573 -5:00 Peru PE%sT # Peru Time
575 # South Georgia
576 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
577 Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken
578 -2:00 - GST # South Georgia Time
580 # South Sandwich Is
581 # uninhabited; scientific personnel have wintered
583 # Suriname
584 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
585 Zone America/Paramaribo -3:40:40 - LMT 1911
586 -3:40:52 - PMT 1935 # Paramaribo Mean Time
587 -3:40:36 - PMT 1945 Oct # The capital moved?
588 -3:30 - NEGT 1975 Nov 20 # Dutch Guiana Time
589 -3:30 - SRT 1984 Oct # Suriname Time
590 -3:00 - SRT
592 # Trinidad and Tobago
593 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
594 Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2
595 -4:00 - AST
597 # Uruguay
598 # From Paul Eggert <eggert@twinsun.com> (1993-11-18):
599 # Uruguay wins the prize for the strangest peacetime manipulation of the rules.
600 # From Shanks:
601 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
602 # Whitman gives 1923 Oct 1; go with Shanks.
603 Rule Uruguay 1923 only - Oct 2 0:00 0:30 HS
604 Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
605 Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS
606 Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS
607 # Shanks gives 1935 Apr 1 0:00 and 1936 Mar 30 0:00; go with Whitman.
608 Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 -
609 Rule Uruguay 1936 only - Nov 1 0:00 0:30 HS
610 Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 -
611 # Whitman gives 1937 Oct 3; go with Shanks.
612 Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HS
613 # Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13,
614 # and 1943 Apr 13 ``to present time''; go with Shanks.
615 Rule Uruguay 1941 only - Aug 1 0:00 0 -
616 Rule Uruguay 1942 only - Jan 1 0:00 0:30 HS
617 Rule Uruguay 1942 only - Dec 14 0:00 1:00 S
618 Rule Uruguay 1943 only - Mar 14 0:00 0 -
619 Rule Uruguay 1959 only - May 24 0:00 1:00 S
620 Rule Uruguay 1959 only - Nov 15 0:00 0 -
621 Rule Uruguay 1960 only - Jan 17 0:00 1:00 S
622 Rule Uruguay 1960 only - Mar 6 0:00 0 -
623 Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 S
624 Rule Uruguay 1965 only - Sep 26 0:00 0 -
625 Rule Uruguay 1966 1967 - Oct 31 0:00 0 -
626 Rule Uruguay 1968 1970 - May 27 0:00 0:30 HS
627 Rule Uruguay 1968 1970 - Dec 2 0:00 0 -
628 Rule Uruguay 1972 only - Apr 24 0:00 1:00 S
629 Rule Uruguay 1972 only - Aug 15 0:00 0 -
630 Rule Uruguay 1974 only - Mar 10 0:00 0:30 HS
631 Rule Uruguay 1974 only - Dec 22 0:00 1:00 S
632 Rule Uruguay 1976 only - Oct 1 0:00 0 -
633 Rule Uruguay 1977 only - Dec 4 0:00 1:00 S
634 Rule Uruguay 1978 only - Apr 1 0:00 0 -
635 Rule Uruguay 1979 only - Oct 1 0:00 1:00 S
636 Rule Uruguay 1980 only - May 1 0:00 0 -
637 Rule Uruguay 1987 only - Dec 14 0:00 1:00 S
638 Rule Uruguay 1988 only - Mar 14 0:00 0 -
639 Rule Uruguay 1988 only - Dec 11 0:00 1:00 S
640 Rule Uruguay 1989 only - Mar 12 0:00 0 -
641 Rule Uruguay 1989 only - Oct 29 0:00 1:00 S
642 # Shanks says no DST was observed in 1990/1 and 1991/2,
643 # and that 1992/3's DST was from 10-25 to 03-01. Go with IATA.
644 Rule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 -
645 Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S
646 Rule Uruguay 1992 only - Oct 18 0:00 1:00 S
647 Rule Uruguay 1993 only - Feb 28 0:00 0 -
648 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
649 Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28
650 -3:44:44 - MMT 1920 May 1 # Montevideo MT
651 -3:30 Uruguay UY%sT 1942 Dec 14 # Uruguay Time
652 -3:00 Uruguay UY%sT
654 # Venezuela
655 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
656 Zone America/Caracas -4:27:44 - LMT 1890
657 -4:27:44 - CMT 1912 Feb 12 # Caracas Mean Time
658 -4:30 - VET 1965 # Venezuela Time
659 -4:00 - VET