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1 # @(#)southamerica 7.46
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> (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 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
47
48 ###############################################################################
49
50 ###############################################################################
51
52 # Argentina
53
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.
57
58 # From U. S. Naval Observatory (1988-01-199):
59 # ARGENTINA 3 H BEHIND UTC
60
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.
64
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 2 0:00 0 -
83 Rule Arg 1967 1968 - Oct Sun>=1 0:00 1:00 S
84 Rule Arg 1968 1969 - Apr Sun>=1 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 1988 only - Dec 1 0:00 1:00 S
88 #
89 # From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26):
90 # These corrections were contributed by InterSoft Argentina S.A.,
91 # obtaining the data from the:
92 # Talleres de Hidrografia Naval Argentina
93 # (Argentine Naval Hydrography Institute)
94 #
95 # Shanks stops after 1992-03-01; go with Otero.
96 Rule Arg 1989 1993 - Mar Sun>=1 0:00 0 -
97 Rule Arg 1989 1992 - Oct Sun>=15 0:00 1:00 S
98 #
99 # From Hernan G. Otero <hernan@isoft.com.ar> (1995-06-26):
100 # From this moment on, the law that mandated the daylight saving
101 # time corrections was derogated and no more modifications
102 # to the time zones (for daylight saving) are now made.
103 #
104 # From Rives McDow (2000-01-10):
105 # On October 3, 1999, 0:00 local, Argentina implemented daylight savings time,
106 # which did not result in the switch of a time zone, as they stayed 9 hours
107 # from the International Date Line.
108 Rule Arg 1999 only - Oct Sun>=1 0:00 1:00 S
109 Rule Arg 2000 only - Mar Sun>=1 0:00 0 -
110 #
111 # From Peter Gradelski via Steffen Thorsen (2000-03-01):
112 # We just checked with our Sao Paulo office and they say the government of
113 # Argentina decided not to become one of the countries that go on or off DST.
114 # So Buenos Aires should be -3 hours from GMT at all times.
115 #
116 # From Fabian L. Arce Jofre <farcejofre@bigfoot.com> (2000-04-04):
117 # The law that claimed DST for Argentina was derogated by President Fernando
118 # de la Rua on March 2, 2000, because it would make people spend more energy
119 # in the winter time, rather than less. The change took effect on March 3.
120 #
121 # From Mariano Absatz (2001-06-06):
122 # one of the major newspapers here in Argentina said that the 1999
123 # Timezone Law (which never was effectively applied) will (would?) be
124 # in effect.... The article is at
125 # http://ar.clarin.com/diario/2001-06-06/e-01701.htm
126 # ... The Law itself is "Ley No 25155", sanctioned on 1999-08-25, enacted
127 # 1999-09-17, and published 1999-09-21. The official publication is at:
128 # http://www.boletin.jus.gov.ar/BON/Primera/1999/09-Septiembre/21/PDF/BO21-09-99LEG.PDF
129 # Regretfully, you have to subscribe (and pay) for the on-line version....
130 #
131 # (2001-06-12):
132 # the timezone for Argentina will not change next Sunday.
133 # Apparently it will do so on Sunday 24th....
134 # http://ar.clarin.com/diario/2001-06-12/s-03501.htm
135 #
136 # (2001-06-25):
137 # Last Friday (yes, the last working day before the date of the change), the
138 # Senate annulled the 1999 law that introduced the changes later postponed.
139 # http://www.clarin.com.ar/diario/2001-06-22/s-03601.htm
140 # It remains the vote of the Deputies..., but it will be the same....
141 # This kind of things had always been done this way in Argentina.
142 # We are still -03:00 all year round in all of the country.
143 #
144 #
145 # From Paul Eggert (2002-01-22):
146 # <a href="http://www.spicasc.net/horvera.html">
147 # Hora de verano para la Republica Argentina (2000-10-01)
148 # </a> says that standard time in Argentina from 1894-10-31
149 # to 1920-05-01 was -4:16:48.25. Go with this more-precise value
150 # over Shanks.
151
152 # Unless otherwise specified, data are from Shanks through 1992, from
153 # the IATA otherwise. As noted below, Shanks says that
154 # America/Cordoba split into 7 subregions during 1991/1992, but we
155 # haven't verified this yet so for now we'll keep it a single region.
156 #
157 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
158 #
159 # Buenos Aires (BA), Capital Federal (CF), Santa Cruz (SC),
160 # Tierra del Fuego, Antartida e Islas del Atlantico Sur (TF)
161 Zone America/Buenos_Aires -3:53:48 - LMT 1894 Oct 31
162 -4:16:48 - CMT 1920 May # Cordoba Mean Time
163 -4:00 - ART 1930 Dec
164 -4:00 Arg AR%sT 1969 Oct 5
165 -3:00 Arg AR%sT 1999 Oct 3
166 -4:00 Arg AR%sT 2000 Mar 3
167 -3:00 - ART
168 #
169 # Santa Fe (SF), Entre Rios (ER), Corrientes (CN), Misiones (MN), Chaco (CC),
170 # Formosa (FM), Salta (SA), Tucuman (TM), Santiago del Estero (SE),
171 # Cordoba (CB), La Rioja (LR), San Juan (SJ), San Luis (SL), La Pampa (LP),
172 # Neuquen (NQ), Rio Negro (RN), Chubut (CH)
173 #
174 # Shanks also makes the following claims, which we haven't verified:
175 # - Formosa switched to -3:00 on 1991-01-07.
176 # - La Rioja and San Juan switched to -4:00 on 1991-03-01
177 # and then to -3:00 on 1991-05-07.
178 # - Misiones switched to -3:00 on 1990-12-29.
179 # - Chaco switched to -3:00 on 1991-01-04.
180 # - San Luis switched to -4:00 on 1990-03-14, then to -3:00 on 1990-10-15,
181 # then to -4:00 on 1991-03-01, then to -3:00 on 1991-06-01.
182 # - Santiago del Estero switched to -4:00 on 1991-04-01,
183 # then to -3:00 on 1991-04-26.
184 # If we need to add Zones for these areas, we may need to have a subdirectory
185 # for Argentina, as e.g. "America/San_Luis" is too ambiguious.
186 #
187 Zone America/Cordoba -4:16:48 - LMT 1894 Oct 31
188 -4:16:48 - CMT 1920 May
189 -4:00 - ART 1930 Dec
190 -4:00 Arg AR%sT 1969 Oct 5
191 -3:00 Arg AR%sT 1991 Mar 3
192 -4:00 - WART 1991 Oct 20
193 -3:00 Arg AR%sT 1999 Oct 3
194 -4:00 Arg AR%sT 2000 Mar 3
195 -3:00 - ART
196 #
197 # Jujuy (JY)
198 Zone America/Jujuy -4:21:12 - LMT 1894 Oct 31
199 -4:16:48 - CMT 1920 May
200 -4:00 - ART 1930 Dec
201 -4:00 Arg AR%sT 1969 Oct 5
202 -3:00 Arg AR%sT 1990 Mar 4
203 -4:00 - WART 1990 Oct 28
204 -4:00 1:00 WARST 1991 Mar 17
205 -4:00 - WART 1991 Oct 6
206 -3:00 1:00 ARST 1992
207 -3:00 Arg AR%sT 1999 Oct 3
208 -4:00 Arg AR%sT 2000 Mar 3
209 -3:00 - ART
210 #
211 # Catamarca (CT)
212 Zone America/Catamarca -4:23:08 - LMT 1894 Oct 31
213 -4:16:48 - CMT 1920 May
214 -4:00 - ART 1930 Dec
215 -4:00 Arg AR%sT 1969 Oct 5
216 -3:00 Arg AR%sT 1991 Mar 3
217 -4:00 - WART 1991 Oct 20
218 -3:00 Arg AR%sT 1999 Oct 3
219 -4:00 Arg AR%sT 2000 Mar 3
220 -3:00 - ART
221 #
222 # Mendoza (MZ)
223 Zone America/Mendoza -4:35:16 - LMT 1894 Oct 31
224 -4:16:48 - CMT 1920 May
225 -4:00 - ART 1930 Dec
226 -4:00 Arg AR%sT 1969 Oct 5
227 -3:00 Arg AR%sT 1990 Mar 4
228 -4:00 - WART 1990 Oct 15
229 -4:00 1:00 WARST 1991 Mar 1
230 -4:00 - WART 1991 Oct 15
231 -4:00 1:00 WARST 1992 Mar 1
232 -4:00 - WART 1992 Oct 18
233 -3:00 Arg AR%sT 1999 Oct 3
234 -4:00 Arg AR%sT 2000 Mar 3
235 -3:00 - ART
236
237 # Aruba
238 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
239 Zone America/Aruba -4:40:24 - LMT 1912 Feb 12 # Oranjestad
240 -4:30 - ANT 1965 # Netherlands Antilles Time
241 -4:00 - AST
242
243 # Bolivia
244 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
245 Zone America/La_Paz -4:32:36 - LMT 1890
246 -4:32:36 - CMT 1931 Oct 15 # Calamarca MT
247 -4:32:36 1:00 BOST 1932 Mar 21 # Bolivia ST
248 -4:00 - BOT # Bolivia Time
249
250 # Brazil
251
252 # From Paul Eggert <eggert@twinsun.com> (1993-11-18):
253 # The mayor of Rio recently attempted to change the time zone rules
254 # just in his city, in order to leave more summer time for the tourist trade.
255 # The rule change lasted only part of the day;
256 # the federal government refused to follow the city's rules, and business
257 # was in a chaos, so the mayor backed down that afternoon.
258
259 # From IATA SSIM (1996-02):
260 # _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS),
261 # Santa Catarina (SC), Parana (PR), Sao Paulo (SP), Rio de Janeiro (RJ),
262 # Espirito Santo (ES), Minas Gerais (MG), Bahia (BA), Goias (GO),
263 # Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL].
264 # [The last three states are new to this issue of the IATA SSIM.]
265
266 # From Gwillim Law (1996-10-07):
267 # Geography, history (Tocantins was part of Goias until 1989), and other
268 # sources of time zone information lead me to believe that AL, SE, and TO were
269 # always in BR1, and so the only change was whether or not they observed DST....
270 # The earliest issue of the SSIM I have is 2/91. Each issue from then until
271 # 9/95 says that DST is observed only in the ten states I quoted from 9/95,
272 # along with Mato Grosso (MT) and Mato Grosso do Sul (MS), which are in BR2
273 # (UTC-4).... The other two time zones given for Brazil are BR3, which is
274 # UTC-5, no DST, and applies only in the state of Acre (AC); and BR4, which is
275 # UTC-2, and applies to Fernando de Noronha (formerly FN, but I believe it's
276 # become part of the state of Pernambuco). The boundary between BR1 and BR2
277 # has never been clearly stated. They've simply been called East and West.
278 # However, some conclusions can be drawn from another IATA manual: the Airline
279 # Coding Directory, which lists close to 400 airports in Brazil. For each
280 # airport it gives a time zone which is coded to the SSIM. From that
281 # information, I'm led to conclude that the states of Amapa (AP), Ceara (CE),
282 # Maranhao (MA), Paraiba (PR), Pernambuco (PE), Piaui (PI), and Rio Grande do
283 # Norte (RN), and the eastern part of Para (PA) are all in BR1 without DST.
284
285 # From Marcos Tadeu (1998-09-27):
286 # <a href="http://pcdsh01.on.br/verao1.html">
287 # Brazilian official page
288 # </a>
289
290 # From Jesper Norgaard (2000-11-03):
291 # [For an official list of which regions in Brazil use which time zones, see:]
292 # http://pcdsh01.on.br/Fusbr.htm
293 # http://pcdsh01.on.br/Fusbrhv.htm
294
295 # From Celso Doria via David Madeo (2002-10-09):
296 # The reason for the delay this year has to do with elections in Brazil.
297 #
298 # Unlike in the United States, elections in Brazil are 100% computerized and
299 # the results are known almost immediately. Yesterday, it was the first
300 # round of the elections when 115 million Brazilians voted for President,
301 # Governor, Senators, Federal Deputies, and State Deputies. Nobody is
302 # counting (or re-counting) votes anymore and we know there will be a second
303 # round for the Presidency and also for some Governors. The 2nd round will
304 # take place on October 27th.
305 #
306 # The reason why the DST will only begin November 3rd is that the thousands
307 # of electoral machines used cannot have their time changed, and since the
308 # Constitution says the elections must begin at 8:00 AM and end at 5:00 PM,
309 # the Government decided to postpone DST, instead of changing the Constitution
310 # (maybe, for the next elections, it will be possible to change the clock)...
311
312 # From Paul Eggert (2002-10-10):
313 # The official decrees referenced below are mostly taken from
314 # <a href="http://pcdsh01.on.br/DecHV.html">
315 # Decretos sobre o Horario de Verao no Brasil
316 # </a> (2001-09-20, in Portuguese).
317 # The official site for all decrees, including those not related to time, is
318 # <a href="http://www.presidencia.gov.br/CCIVIL/decreto/principal_ano.htm">
319 # Presidencia da Republica, Subchefia para Assuntos Juridicos, Decretos
320 # </a> (in Portuguese).
321
322 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
323 # Decree <a href="http://pcdsh01.on.br/HV20466.htm">20,466</a> (1931-10-01)
324 # Decree <a href="http://pcdsh01.on.br/HV21896.htm">21,896</a> (1932-01-10)
325 Rule Brazil 1931 only - Oct 3 11:00 1:00 S
326 Rule Brazil 1932 1933 - Apr 1 0:00 0 -
327 Rule Brazil 1932 only - Oct 3 0:00 1:00 S
328 # Decree <a href="http://pcdsh01.on.br/HV23195.htm">23,195</a> (1933-10-10)
329 # revoked DST.
330 # Decree <a href="http://pcdsh01.on.br/HV27496.htm">27,496</a> (1949-11-24)
331 # Decree <a href="http://pcdsh01.on.br/HV27998.htm">27,998</a> (1950-04-13)
332 Rule Brazil 1949 1952 - Dec 1 0:00 1:00 S
333 Rule Brazil 1950 only - Apr 16 1:00 0 -
334 Rule Brazil 1951 1952 - Apr 1 0:00 0 -
335 # Decree <a href="http://pcdsh01.on.br/HV32308.htm">32,308</a> (1953-02-24)
336 Rule Brazil 1953 only - Mar 1 0:00 0 -
337 # Decree <a href="http://pcdsh01.on.br/HV34724.htm">34,724</a> (1953-11-30)
338 # revoked DST.
339 # Decree <a href="http://pcdsh01.on.br/HV52700.htm">52,700</a> (1963-10-18)
340 # established DST from 1963-10-23 00:00 to 1964-02-29 00:00
341 # in SP, RJ, GB, MG, ES, due to the prolongation of the drought.
342 # Decree <a href="http://pcdsh01.on.br/HV53071.htm">53,071</a> (1963-12-03)
343 # extended the above decree to all of the national territory on 12-09.
344 Rule Brazil 1963 only - Dec 9 0:00 1:00 S
345 # Decree <a href="http://pcdsh01.on.br/HV53604.htm">53,604</a> (1964-02-25)
346 # extended summer time by one day to 1964-03-01 00:00 (start of school).
347 Rule Brazil 1964 only - Mar 1 0:00 0 -
348 # Decree <a href="http://pcdsh01.on.br/HV55639.htm">55,639</a> (1965-01-27)
349 Rule Brazil 1965 only - Jan 31 0:00 1:00 S
350 Rule Brazil 1965 only - Mar 31 0:00 0 -
351 # Decree <a href="http://pcdsh01.on.br/HV57303.htm">57,303</a> (1965-11-22)
352 Rule Brazil 1965 only - Dec 1 0:00 1:00 S
353 # Decree <a href="http://pcdsh01.on.br/HV57843.htm">57,843</a> (1966-02-18)
354 Rule Brazil 1966 1968 - Mar 1 0:00 0 -
355 Rule Brazil 1966 1967 - Nov 1 0:00 1:00 S
356 # Decree <a href="http://pcdsh01.on.br/HV63429.htm">63,429</a> (1968-10-15)
357 # revoked DST.
358 # Decree <a href="http://pcdsh01.on.br/HV91698.htm">91,698</a> (1985-09-27)
359 Rule Brazil 1985 only - Nov 2 0:00 1:00 S
360 # Decree 92,310 (1986-01-21)
361 # Decree 92,463 (1986-03-13)
362 Rule Brazil 1986 only - Mar 15 0:00 0 -
363 # Decree 93,316 (1986-10-01)
364 Rule Brazil 1986 only - Oct 25 0:00 1:00 S
365 Rule Brazil 1987 only - Feb 14 0:00 0 -
366 # Decree <a href="http://pcdsh01.on.br/HV94922.htm">94,922</a> (1987-09-22)
367 Rule Brazil 1987 only - Oct 25 0:00 1:00 S
368 Rule Brazil 1988 only - Feb 7 0:00 0 -
369 # Decree <a href="http://pcdsh01.on.br/HV96676.htm">96,676</a> (1988-09-12)
370 # except for the states of AC, AM, PA, RR, RO, and AP (then a territory)
371 Rule Brazil 1988 only - Oct 16 0:00 1:00 S
372 Rule Brazil 1989 only - Jan 29 0:00 0 -
373 # Decree <a href="http://pcdsh01.on.br/HV98077.htm">98,077</a> (1989-08-21)
374 # with the same exceptions
375 Rule Brazil 1989 only - Oct 15 0:00 1:00 S
376 Rule Brazil 1990 only - Feb 11 0:00 0 -
377 # Decree <a href="http://pcdsh01.on.br/HV99530.htm">99,530</a> (1990-09-17)
378 # adopted by RS, SC, PR, SP, RJ, ES, MG, GO, MS, DF.
379 # Decree 99,629 (1990-10-19) adds BA, MT.
380 Rule Brazil 1990 only - Oct 21 0:00 1:00 S
381 Rule Brazil 1991 only - Feb 17 0:00 0 -
382 # <a href="http://pcdsh01.on.br/HV1991.htm">Unnumbered decree</a> (1991-09-25)
383 # adopted by RS, SC, PR, SP, RJ, ES, MG, BA, GO, MT, MS, DF.
384 Rule Brazil 1991 only - Oct 20 0:00 1:00 S
385 Rule Brazil 1992 only - Feb 9 0:00 0 -
386 # <a href="http://pcdsh01.on.br/HV1992.htm">Unnumbered decree</a> (1992-10-16)
387 # adopted by same states.
388 Rule Brazil 1992 only - Oct 25 0:00 1:00 S
389 Rule Brazil 1993 only - Jan 31 0:00 0 -
390 # Decree <a href="http://pcdsh01.on.br/HV942.htm">942</a> (1993-09-28)
391 # adopted by same states, plus AM.
392 # Decree <a href="http://pcdsh01.on.br/HV1252.htm">1,252</a> (1994-09-22)
393 # adopted by same states, minus AM.
394 # Decree <a href="http://pcdsh01.on.br/HV1636.htm">1,636</a> (1995-09-14)
395 # adopted by same states, plus TO.
396 # Decree <a href="http://pcdsh01.on.br/HV1674.htm">1,674</a> (1995-10-13)
397 # adds AL, SE.
398 Rule Brazil 1993 1995 - Oct Sun>=11 0:00 1:00 S
399 Rule Brazil 1994 1995 - Feb Sun>=15 0:00 0 -
400 Rule Brazil 1996 only - Feb 11 0:00 0 -
401 # Decree <a href="http://pcdsh01.on.br/HV2000.htm">2,000</a> (1996-09-04)
402 # adopted by same states, minus AL, SE.
403 Rule Brazil 1996 only - Oct 6 0:00 1:00 S
404 Rule Brazil 1997 only - Feb 16 0:00 0 -
405 # From Daniel C. Sobral <dcs@gns.com.br> (1998-02-12):
406 # In 1997, the DS began on October 6. The stated reason was that
407 # because international television networks ignored Brazil's policy on DS,
408 # they bought the wrong times on satellite for coverage of Pope's visit.
409 # This year, the ending date of DS was postponed to March 1
410 # to help dealing with the shortages of electric power.
411 #
412 # From Paul Eggert (1998-02-25):
413 # <a href="http://churchnet.ucsm.ac.uk/news/files2/news165.htm">
414 # Brazil Prepares for Papal Visit
415 # </a>,
416 # Church Net UK (1997-10-02).
417 #
418 # Decree 2,317 (1997-09-04), adopted by same states.
419 Rule Brazil 1997 only - Oct 6 0:00 1:00 S
420 # Decree <a href="http://pcdsh01.on.br/figuras/HV2495.JPG">2,495</a>
421 # (1998-02-10)
422 Rule Brazil 1998 only - Mar 1 0:00 0 -
423 # Decree <a href="http://pcdsh01.on.br/figuras/Hv98.jpg">2,780</a> (1998-09-11)
424 # adopted by the same states as before.
425 Rule Brazil 1998 only - Oct 11 0:00 1:00 S
426 Rule Brazil 1999 only - Feb 21 0:00 0 -
427 # Decree <a href="http://pcdsh01.on.br/figuras/HV3150.gif">3,150</a>
428 # (1999-08-23) adopted by same states.
429 # Decree <a href="http://pcdsh01.on.br/DecHV99.gif">3,188</a> (1999-09-30)
430 # adds SE, AL, PB, PE, RN, CE, PI, MA and RR.
431 Rule Brazil 1999 only - Oct 3 0:00 1:00 S
432 Rule Brazil 2000 only - Feb 27 0:00 0 -
433 # Decree <a href="http://pcdsh01.on.br/DEC3592.htm">3,592</a> (2000-09-06)
434 # adopted by the same states as before.
435 # Decree <a href="http://pcdsh01.on.br/Dec3630.jpg">3,630</a> (2000-10-13)
436 # repeals DST in PE and RR, effective 2000-10-15 00:00.
437 # Decree <a href="http://pcdsh01.on.br/Dec3632.jpg">3,632</a> (2000-10-17)
438 # repeals DST in SE, AL, PB, RN, CE, PI and MA, effective 2000-10-22 00:00.
439 # Decree <a href="http://pcdsh01.on.br/figuras/HV3916.gif">3,916</a>
440 # (2001-09-13) reestablishes DST in AL, CE, MA, PB, PE, PI, RN, SE.
441 Rule Brazil 2000 2001 - Oct Sun>=8 0:00 1:00 S
442 Rule Brazil 2001 max - Feb Sun>=15 0:00 0 -
443 # Decree 4,399 (2002-10-01) repeals DST in AL, CE, MA, PB, PE, PI, RN, SE.
444 # <a href="http://www.presidencia.gov.br/CCIVIL/decreto/2002/D4399.htm"></a>
445 Rule Brazil 2002 only - Nov 3 0:00 1:00 S
446 #
447 Rule Brazil 2003 max - Oct Sun>=8 0:00 1:00 S
448 # The latest decree listed above says that the following states observe DST:
449 # BA, DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP, TO.
450 #
451 # For dates after mid-2003, the above rules with TO="max" are guesses
452 # and are quite possibly wrong, but are more likely than no DST at all.
453
454
455 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
456 #
457 # Atlantic islands: Fernando de Noronha, Trindade, Martin Vaz,
458 # Atol das Rocas, and Penedos de Sao Pedro e Sao Paulo
459 Zone America/Noronha -2:09:40 - LMT 1914
460 -2:00 Brazil FN%sT 1990 Sep 17
461 -2:00 - FNT
462 #
463 # Amapa (AP), east Para (PA)
464 # East Para includes Belem, Maraba, Serra Norte, and Sao Felix do Xingu.
465 Zone America/Belem -3:13:56 - LMT 1914
466 -3:00 Brazil BR%sT 1988 Sep 12
467 -3:00 - BRT
468 #
469 # Maranhao (MA), Piaui (PI), Ceara (CE), Rio Grande do Norte (RN),
470 # Paraiba (PB)
471 Zone America/Fortaleza -2:34:00 - LMT 1914
472 -3:00 Brazil BR%sT 1990 Sep 17
473 -3:00 - BRT 1999 Sep 30
474 -3:00 Brazil BR%sT 2000 Oct 22
475 -3:00 - BRT 2001 Sep 13
476 -3:00 Brazil BR%sT 2002 Oct 1
477 -3:00 - BRT
478 #
479 # Pernambuco (PE) (except Atlantic islands)
480 Zone America/Recife -2:19:36 - LMT 1914
481 -3:00 Brazil BR%sT 1990 Sep 17
482 -3:00 - BRT 1999 Sep 30
483 -3:00 Brazil BR%sT 2000 Oct 15
484 -3:00 - BRT 2001 Sep 13
485 -3:00 Brazil BR%sT 2002 Oct 1
486 -3:00 - BRT
487 #
488 # Tocantins (TO)
489 Zone America/Araguaina -3:12:48 - LMT 1914
490 -3:00 Brazil BR%sT 1990 Sep 17
491 -3:00 - BRT 1995 Sep 14
492 -3:00 Brazil BR%sT
493 #
494 # Alagoas (AL), Sergipe (SE)
495 Zone America/Maceio -2:22:52 - LMT 1914
496 -3:00 Brazil BR%sT 1990 Sep 17
497 -3:00 - BRT 1995 Oct 13
498 -3:00 Brazil BR%sT 1996 Sep 4
499 -3:00 - BRT 1999 Sep 30
500 -3:00 Brazil BR%sT 2000 Oct 22
501 -3:00 - BRT 2001 Sep 13
502 -3:00 Brazil BR%sT 2002 Oct 1
503 -3:00 - BRT
504 #
505 # Bahia (BA), Goias (GO), Distrito Federal (DF), Minas Gerais (MG),
506 # Espirito Santo (ES), Rio de Janeiro (RJ), Sao Paulo (SP), Parana (PR),
507 # Santa Catarina (SC), Rio Grande do Sul (RS)
508 Zone America/Sao_Paulo -3:06:28 - LMT 1914
509 -3:00 Brazil BR%sT 1963 Oct 23 00:00
510 -3:00 1:00 BRST 1964
511 -3:00 Brazil BR%sT
512 #
513 # Mato Grosso (MT), Mato Grosso do Sul (MS)
514 Zone America/Cuiaba -3:44:20 - LMT 1914
515 -4:00 Brazil AM%sT
516 #
517 # west Para (PA), Rondonia (RO)
518 # West Para includes Altamira, Oribidos, Prainha, Oriximina, and Santarem.
519 Zone America/Porto_Velho -4:15:36 - LMT 1914
520 -4:00 Brazil AM%sT 1988 Sep 12
521 -4:00 - AMT
522 #
523 # Roraima (RR)
524 Zone America/Boa_Vista -4:02:40 - LMT 1914
525 -4:00 Brazil AM%sT 1988 Sep 12
526 -4:00 - AMT 1999 Sep 30
527 -4:00 Brazil AM%sT 2000 Oct 15
528 -4:00 - AMT
529 #
530 # east Amazonas (AM): Boca do Acre, Jutai, Manaus, Floriano Peixoto
531 Zone America/Manaus -4:00:04 - LMT 1914
532 -4:00 Brazil AM%sT 1988 Sep 12
533 -4:00 - AMT 1993 Sep 28
534 -4:00 Brazil AM%sT 1994 Sep 22
535 -4:00 - AMT
536 #
537 # west Amazonas (AM): Atalaia do Norte, Boca do Maoco, Benjamin Constant,
538 # Eirunepe, Envira, Ipixuna
539 Zone America/Eirunepe -4:39:28 - LMT 1914
540 -5:00 Brazil AC%sT 1988 Sep 12
541 -5:00 - ACT 1993 Sep 28
542 -5:00 Brazil AC%sT 1994 Sep 22
543 -5:00 - ACT
544 #
545 # Acre (AC)
546 Zone America/Rio_Branco -4:31:12 - LMT 1914
547 -5:00 Brazil AC%sT 1988 Sep 12
548 -5:00 - ACT
549
550
551 # Chile
552
553 # From Eduardo Krell (1995-10-19):
554 # The law says to switch to DST at midnight [24:00] on the second SATURDAY
555 # of October.... The law is the same for March and October.
556 # (1998-09-29):
557 # Because of the drought this year, the government decided to go into
558 # DST earlier (saturday 9/26 at 24:00). This is a one-time change only ...
559 # (unless there's another dry season next year, I guess).
560
561 # From Julio I. Pacheco Troncoso (1999-03-18):
562 # Because of the same drought, the government decided to end DST later,
563 # on April 3, (one-time change).
564
565 # From Gwillim Law (2001-05-04):
566 # I came across another article in "La Tercera" about Chilean DST.
567 # <http://www.tercera.cl/diario/2000/10/13/t-extras.html>
568 # It clearly confirms my earlier suggestion, that DST begins at 22:00
569 # on Easter Island.... But it also seems to be saying that the
570 # observance of DST in Chile began in 1966, rather than 1969 as
571 # ... [Shanks] has it....
572 #
573 # My translation:
574 #
575 # "The Chilean Army has announced that summer time will begin tomorrow,
576 # Saturday, October 14 in continental Chile, insular Chile, and
577 # Antarctica, as provided by Supreme Decree 25 of January 11, 1966.
578 # By the preceding, official time in continental Chile and Chilean
579 # Antarctic, and official time in Western Insular Chile, which applies
580 # to Easter Island and Sala y Gomez Island, will be set forward at
581 # midnight and at 22:00, respectively, by 20 minutes."
582
583 # From Paul Eggert (2001-05-04):
584 # Go with this article in preference to Shanks's 1969 date for modern DST.
585 # Assume this rule has been used since DST was introduced in the islands.
586
587 # From Paul Eggert (2002-10-24):
588 # <http://www.shoa.cl/shoa/faqhoraoficial.htm> gives many details that
589 # disagree with the following table, but we haven't had time to compare them.
590
591 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
592 Rule Chile 1918 only - Sep 1 0:00 1:00 S
593 Rule Chile 1919 only - Jul 2 0:00 0 -
594 Rule Chile 1927 1931 - Sep 1 0:00 1:00 S
595 Rule Chile 1928 1932 - Apr 1 0:00 0 -
596 Rule Chile 1966 1997 - Oct Sun>=9 4:00u 1:00 S
597 Rule Chile 1967 1998 - Mar Sun>=9 3:00u 0 -
598 Rule Chile 1998 only - Sep 27 4:00u 1:00 S
599 Rule Chile 1999 only - Apr 4 3:00u 0 -
600 Rule Chile 1999 max - Oct Sun>=9 4:00u 1:00 S
601 Rule Chile 2000 max - Mar Sun>=9 3:00u 0 -
602 # IATA SSIM anomalies: (1990-09) says 1990-09-16; (1992-02) says 1992-03-14;
603 # (1996-09) says 1998-03-08. Ignore these.
604 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
605 Zone America/Santiago -4:42:40 - LMT 1890
606 -4:42:40 - SMT 1910 # Santiago Mean Time
607 -5:00 Chile CL%sT 1932 Sep # Chile Time
608 -4:00 Chile CL%sT
609 Zone Pacific/Easter -7:17:28 - LMT 1890 # Mataveri
610 -7:17:28 - MMT 1932 Sep # Mataveri Mean Time
611 -7:00 Chile EAS%sT 1982 Mar 14 # Easter I Time
612 -6:00 Chile EAS%sT
613 #
614 # Sala y Gomez Island is like Pacific/Easter.
615 # Other Chilean locations, including Juan Fernandez Is, San Ambrosio,
616 # San Felix, and Antarctic bases, are like America/Santiago.
617
618 # Colombia
619 # Shanks specifies 24:00 for 1992 transition times; go with IATA,
620 # as it seems implausible to change clocks at midnight New Year's Eve.
621 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
622 Rule CO 1992 only - May 2 0:00 1:00 S
623 Rule CO 1992 only - Dec 31 0:00 0 -
624 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
625 Zone America/Bogota -4:56:20 - LMT 1884 Mar 13
626 -4:56:20 - BMT 1914 Nov 23 # Bogota Mean Time
627 -5:00 CO CO%sT # Colombia Time
628 # Malpelo, Providencia, San Andres
629 # no information; probably like America/Bogota
630
631 # Curacao
632 # Shanks says that Bottom and Oranjestad have been at -4:00 since
633 # standard time was introduced on 1912-03-02; and that Kralendijk and Rincon
634 # used Kralendijk Mean Time (-4:33:08) from 1912-02-02 to 1965-01-01.
635 # This all predates our 1970 cutoff, though.
636 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
637 Zone America/Curacao -4:35:44 - LMT 1912 Feb 12 # Willemstad
638 -4:30 - ANT 1965 # Netherlands Antilles Time
639 -4:00 - AST
640
641 # Ecuador
642 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
643 Zone America/Guayaquil -5:19:20 - LMT 1890
644 -5:14:00 - QMT 1931 # Quito Mean Time
645 -5:00 - ECT # Ecuador Time
646 Zone Pacific/Galapagos -5:58:24 - LMT 1931 # Puerto Baquerizo Moreno
647 -5:00 - ECT 1986
648 -6:00 - GALT # Galapagos Time
649
650 # Falklands
651
652 # From Paul Eggert (2001-03-05):
653 # Between 1990 and 2000 inclusive, Shanks and the IATA agree except
654 # the IATA gives 1996-09-08. Go with Shanks.
655
656 # From Falkland Islands Government Office, London (2001-01-22)
657 # via Jesper Norgaard:
658 # ... the clocks revert back to Local Mean Time at 2 am on Sunday 15
659 # April 2001 and advance one hour to summer time at 2 am on Sunday 2
660 # September. It is anticipated that the clocks will revert back at 2
661 # am on Sunday 21 April 2002 and advance to summer time at 2 am on
662 # Sunday 1 September.
663
664 # From Rives McDow (2001-02-13):
665 #
666 # I have communicated several times with people there, and the last
667 # time I had communications that was helpful was in 1998. Here is
668 # what was said then:
669 #
670 # "The general rule was that Stanley used daylight saving and the Camp
671 # did not. However for various reasons many people in the Camp have
672 # started to use daylight saving (known locally as 'Stanley Time')
673 # There is no rule as to who uses daylight saving - it is a matter of
674 # personal choice and so it is impossible to draw a map showing who
675 # uses it and who does not. Any list would be out of date as soon as
676 # it was produced. This year daylight saving ended on April 18/19th
677 # and started again on September 12/13th. I do not know what the rule
678 # is, but can find out if you like. We do not change at the same time
679 # as UK or Chile."
680 #
681 # I did have in my notes that the rule was "Second Saturday in Sep at
682 # 0:00 until third Saturday in Apr at 0:00". I think that this does
683 # not agree in some cases with Shanks; is this true?
684 #
685 # Also, there is no mention in the list that some areas in the
686 # Falklands do not use DST. I have found in my communications there
687 # that these areas are on the western half of East Falkland and all of
688 # West Falkland. Stanley is the only place that consistently observes
689 # DST. Again, as in other places in the world, the farmers don't like
690 # it. West Falkland is almost entirely sheep farmers.
691 #
692 # I know one lady there that keeps a list of which farm keeps DST and
693 # which doesn't each year. She runs a shop in Stanley, and says that
694 # the list changes each year. She uses it to communicate to her
695 # customers, catching them when they are home for lunch or dinner.
696
697 # From Paul Eggert (2001-03-05):
698 # For now, we'll just record the time in Stanley, since we have no
699 # better info.
700
701 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
702 Rule Falk 1937 1938 - Sep lastSun 0:00 1:00 S
703 Rule Falk 1938 1942 - Mar Sun>=19 0:00 0 -
704 Rule Falk 1939 only - Oct 1 0:00 1:00 S
705 Rule Falk 1940 1942 - Sep lastSun 0:00 1:00 S
706 Rule Falk 1943 only - Jan 1 0:00 0 -
707 Rule Falk 1983 only - Sep lastSun 0:00 1:00 S
708 Rule Falk 1984 1985 - Apr lastSun 0:00 0 -
709 Rule Falk 1984 only - Sep 16 0:00 1:00 S
710 Rule Falk 1985 2000 - Sep Sun>=9 0:00 1:00 S
711 Rule Falk 1986 2000 - Apr Sun>=16 0:00 0 -
712 Rule Falk 2001 max - Apr Sun>=15 2:00 0 -
713 Rule Falk 2001 max - Sep Sun>=1 2:00 1:00 S
714 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
715 Zone Atlantic/Stanley -3:51:24 - LMT 1890
716 -3:51:24 - SMT 1912 Mar 12 # Stanley Mean Time
717 -4:00 Falk FK%sT 1983 May # Falkland Is Time
718 -3:00 Falk FK%sT 1985 Sep 15
719 -4:00 Falk FK%sT
720
721 # French Guiana
722 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
723 Zone America/Cayenne -3:29:20 - LMT 1911 Jul
724 -4:00 - GFT 1967 Oct # French Guiana Time
725 -3:00 - GFT
726
727 # Guyana
728 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
729 Zone America/Guyana -3:52:40 - LMT 1915 Mar # Georgetown
730 -3:45 - GBGT 1966 May 26 # Br Guiana Time
731 -3:45 - GYT 1975 Jul 31 # Guyana Time
732 -3:00 - GYT 1991
733 # IATA SSIM (1996-06) says -4:00. Assume a 1991 switch.
734 -4:00 - GYT
735
736 # Paraguay
737 # From Paul Eggert (1999-10-29):
738 # Shanks (1999) says that spring transitions are from 01:00 -> 02:00,
739 # and autumn transitions are from 00:00 -> 23:00. Go with earlier
740 # editions of Shanks, and with the IATA, who say transitions occur at 00:00.
741 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
742 Rule Para 1975 1988 - Oct 1 0:00 1:00 S
743 Rule Para 1975 1978 - Mar 1 0:00 0 -
744 Rule Para 1979 1991 - Apr 1 0:00 0 -
745 Rule Para 1989 only - Oct 22 0:00 1:00 S
746 Rule Para 1990 only - Oct 1 0:00 1:00 S
747 Rule Para 1991 only - Oct 6 0:00 1:00 S
748 Rule Para 1992 only - Mar 1 0:00 0 -
749 Rule Para 1992 only - Oct 5 0:00 1:00 S
750 Rule Para 1993 only - Mar 31 0:00 0 -
751 Rule Para 1993 1995 - Oct 1 0:00 1:00 S
752 Rule Para 1994 1995 - Feb lastSun 0:00 0 -
753 Rule Para 1996 only - Mar 1 0:00 0 -
754 # IATA SSIM (2000-02) says 1999-10-10; ignore this for now.
755 # From Steffen Thorsen (2000-10-02):
756 # I have three independent reports that Paraguay changed to DST this Sunday
757 # (10-01).
758 #
759 # Translated by Gwillim Law (2001-02-27) from
760 # <a href="http://www.diarionoticias.com.py/011000/nacional/naciona1.htm">
761 # Noticias, a daily paper in Asuncion, Paraguay (2000-10-01)
762 # </a>:
763 # Starting at 0:00 today, the clock will be set forward 60 minutes, in
764 # fulfillment of Decree No. 7,273 of the Executive Power.... The time change
765 # system has been operating for several years. Formerly there was a separate
766 # decree each year; the new law has the same effect, but permanently. Every
767 # year, the time will change on the first Sunday of October; likewise, the
768 # clock will be set back on the first Sunday of March.
769 #
770 # From Jesper Norgaard (2001-03-06) [an official URL saying similar things]:
771 # http://gateway.abc.com.py:8000/pub/pag04.mbr/artic?FHA=2001-03-03-02.24.52.900592
772 #
773 Rule Para 1996 2001 - Oct Sun>=1 0:00 1:00 S
774 # IATA SSIM (1997-09) says Mar 1; go with Shanks.
775 Rule Para 1997 only - Feb lastSun 0:00 0 -
776 # Shanks says 1999-02-28; IATA SSIM (1999-02) says 1999-02-27, but
777 # (1999-09) reports no date; go with above sources and Gerd Knops (2001-02-27).
778 Rule Para 1998 2001 - Mar Sun>=1 0:00 0 -
779 # From Rives McDow (2002-02-28):
780 # A decree was issued in Paraguay (no. 16350) on 2002-02-26 that changed the
781 # dst method to be from the first Sunday in September to the first Sunday in
782 # April.
783 Rule Para 2002 max - Apr Sun>=1 0:00 0 -
784 Rule Para 2002 max - Sep Sun>=1 0:00 1:00 S
785
786
787 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
788 Zone America/Asuncion -3:50:40 - LMT 1890
789 -3:50:40 - AMT 1931 Oct 10 # Asuncion Mean Time
790 -4:00 - PYT 1972 Oct # Paraguay Time
791 -3:00 - PYT 1974 Apr
792 -4:00 Para PY%sT
793
794 # Peru
795 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
796 Rule Peru 1938 only - Jan 1 0:00 1:00 S
797 Rule Peru 1938 only - Apr 1 0:00 0 -
798 Rule Peru 1938 1939 - Sep lastSun 0:00 1:00 S
799 Rule Peru 1939 1940 - Mar Sun>=24 0:00 0 -
800 Rule Peru 1987 only - Jan 1 0:00 1:00 S
801 Rule Peru 1987 only - Apr 1 0:00 0 -
802 Rule Peru 1990 only - Jan 1 0:00 1:00 S
803 Rule Peru 1990 only - Apr 1 0:00 0 -
804 # IATA is ambiguous for 1993/1995; go with Shanks.
805 Rule Peru 1994 only - Jan 1 0:00 1:00 S
806 Rule Peru 1994 only - Apr 1 0:00 0 -
807 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
808 Zone America/Lima -5:08:12 - LMT 1890
809 -5:08:36 - LMT 1908 Jul 28 # Lima Mean Time?
810 -5:00 Peru PE%sT # Peru Time
811
812 # South Georgia
813 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
814 Zone Atlantic/South_Georgia -2:26:08 - LMT 1890 # Grytviken
815 -2:00 - GST # South Georgia Time
816
817 # South Sandwich Is
818 # uninhabited; scientific personnel have wintered
819
820 # Suriname
821 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
822 Zone America/Paramaribo -3:40:40 - LMT 1911
823 -3:40:52 - PMT 1935 # Paramaribo Mean Time
824 -3:40:36 - PMT 1945 Oct # The capital moved?
825 -3:30 - NEGT 1975 Nov 20 # Dutch Guiana Time
826 -3:30 - SRT 1984 Oct # Suriname Time
827 -3:00 - SRT
828
829 # Trinidad and Tobago
830 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
831 Zone America/Port_of_Spain -4:06:04 - LMT 1912 Mar 2
832 -4:00 - AST
833
834 # Uruguay
835 # From Paul Eggert <eggert@twinsun.com> (1993-11-18):
836 # Uruguay wins the prize for the strangest peacetime manipulation of the rules.
837 # From Shanks:
838 # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
839 # Whitman gives 1923 Oct 1; go with Shanks.
840 Rule Uruguay 1923 only - Oct 2 0:00 0:30 HS
841 Rule Uruguay 1924 1926 - Apr 1 0:00 0 -
842 Rule Uruguay 1924 1925 - Oct 1 0:00 0:30 HS
843 Rule Uruguay 1933 1935 - Oct lastSun 0:00 0:30 HS
844 # Shanks gives 1935 Apr 1 0:00 and 1936 Mar 30 0:00; go with Whitman.
845 Rule Uruguay 1934 1936 - Mar Sat>=25 23:30s 0 -
846 Rule Uruguay 1936 only - Nov 1 0:00 0:30 HS
847 Rule Uruguay 1937 1941 - Mar lastSun 0:00 0 -
848 # Whitman gives 1937 Oct 3; go with Shanks.
849 Rule Uruguay 1937 1940 - Oct lastSun 0:00 0:30 HS
850 # Whitman gives 1941 Oct 24 - 1942 Mar 27, 1942 Dec 14 - 1943 Apr 13,
851 # and 1943 Apr 13 ``to present time''; go with Shanks.
852 Rule Uruguay 1941 only - Aug 1 0:00 0 -
853 Rule Uruguay 1942 only - Jan 1 0:00 0:30 HS
854 Rule Uruguay 1942 only - Dec 14 0:00 1:00 S
855 Rule Uruguay 1943 only - Mar 14 0:00 0 -
856 Rule Uruguay 1959 only - May 24 0:00 1:00 S
857 Rule Uruguay 1959 only - Nov 15 0:00 0 -
858 Rule Uruguay 1960 only - Jan 17 0:00 1:00 S
859 Rule Uruguay 1960 only - Mar 6 0:00 0 -
860 Rule Uruguay 1965 1967 - Apr Sun>=1 0:00 1:00 S
861 Rule Uruguay 1965 only - Sep 26 0:00 0 -
862 Rule Uruguay 1966 1967 - Oct 31 0:00 0 -
863 Rule Uruguay 1968 1970 - May 27 0:00 0:30 HS
864 Rule Uruguay 1968 1970 - Dec 2 0:00 0 -
865 Rule Uruguay 1972 only - Apr 24 0:00 1:00 S
866 Rule Uruguay 1972 only - Aug 15 0:00 0 -
867 Rule Uruguay 1974 only - Mar 10 0:00 0:30 HS
868 Rule Uruguay 1974 only - Dec 22 0:00 1:00 S
869 Rule Uruguay 1976 only - Oct 1 0:00 0 -
870 Rule Uruguay 1977 only - Dec 4 0:00 1:00 S
871 Rule Uruguay 1978 only - Apr 1 0:00 0 -
872 Rule Uruguay 1979 only - Oct 1 0:00 1:00 S
873 Rule Uruguay 1980 only - May 1 0:00 0 -
874 Rule Uruguay 1987 only - Dec 14 0:00 1:00 S
875 Rule Uruguay 1988 only - Mar 14 0:00 0 -
876 Rule Uruguay 1988 only - Dec 11 0:00 1:00 S
877 Rule Uruguay 1989 only - Mar 12 0:00 0 -
878 Rule Uruguay 1989 only - Oct 29 0:00 1:00 S
879 # Shanks says no DST was observed in 1990/1 and 1991/2,
880 # and that 1992/3's DST was from 10-25 to 03-01. Go with IATA.
881 Rule Uruguay 1990 1992 - Mar Sun>=1 0:00 0 -
882 Rule Uruguay 1990 1991 - Oct Sun>=21 0:00 1:00 S
883 Rule Uruguay 1992 only - Oct 18 0:00 1:00 S
884 Rule Uruguay 1993 only - Feb 28 0:00 0 -
885 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
886 Zone America/Montevideo -3:44:44 - LMT 1898 Jun 28
887 -3:44:44 - MMT 1920 May 1 # Montevideo MT
888 -3:30 Uruguay UY%sT 1942 Dec 14 # Uruguay Time
889 -3:00 Uruguay UY%sT
890
891 # Venezuela
892 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
893 Zone America/Caracas -4:27:44 - LMT 1890
894 -4:27:40 - CMT 1912 Feb 12 # Caracas Mean Time?
895 -4:30 - VET 1965 # Venezuela Time
896 -4:00 - VET