31
32 # From Paul Eggert (2016-12-05):
33 #
34 # Unless otherwise specified, the source for data through 1990 is:
35 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
36 # San Diego: ACS Publications, Inc. (2003).
37 # Unfortunately this book contains many errors and cites no sources.
38 #
39 # Many years ago Gwillim Law wrote that a good source
40 # for time zone data was the International Air Transport
41 # Association's Standard Schedules Information Manual (IATA SSIM),
42 # published semiannually. Law sent in several helpful summaries
43 # of the IATA's data after 1990. Except where otherwise noted,
44 # IATA SSIM is the source for entries after 1990.
45 #
46 # For data circa 1899, a common source is:
47 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94.
48 # https://www.jstor.org/stable/1774359
49 #
50 # These tables use numeric abbreviations like -03 and -0330 for
51 # integer hour and minute UTC offsets. Although earlier editions used
52 # alphabetic time zone abbreviations, these abbreviations were
53 # invented and did not reflect common practice.
54
55 ###############################################################################
56
57 ###############################################################################
58
59 # Argentina
60
61 # From Bob Devine (1988-01-28):
62 # Argentina: first Sunday in October to first Sunday in April since 1976.
63 # Double Summer time from 1969 to 1974. Switches at midnight.
64
65 # From U. S. Naval Observatory (1988-01-19):
66 # ARGENTINA 3 H BEHIND UTC
67
68 # From Hernan G. Otero (1995-06-26):
69 # I am sending modifications to the Argentine time zone table...
70 # AR was chosen because they are the ISO letters that represent Argentina.
71
585 #
586 # Tierra del Fuego, Antártida e Islas del Atlántico Sur (TF)
587 Zone America/Argentina/Ushuaia -4:33:12 - LMT 1894 Oct 31
588 -4:16:48 - CMT 1920 May
589 -4:00 - -04 1930 Dec
590 -4:00 Arg -04/-03 1969 Oct 5
591 -3:00 Arg -03/-02 1999 Oct 3
592 -4:00 Arg -04/-03 2000 Mar 3
593 -3:00 - -03 2004 May 30
594 -4:00 - -04 2004 Jun 20
595 -3:00 Arg -03/-02 2008 Oct 18
596 -3:00 - -03
597
598 # Aruba
599 Link America/Curacao America/Aruba
600
601 # Bolivia
602 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
603 Zone America/La_Paz -4:32:36 - LMT 1890
604 -4:32:36 - CMT 1931 Oct 15 # Calamarca MT
605 -4:32:36 1:00 BOST 1932 Mar 21 # Bolivia ST
606 -4:00 - -04
607
608 # Brazil
609
610 # From Paul Eggert (1993-11-18):
611 # The mayor of Rio recently attempted to change the time zone rules
612 # just in his city, in order to leave more summer time for the tourist trade.
613 # The rule change lasted only part of the day;
614 # the federal government refused to follow the city's rules, and business
615 # was in a chaos, so the mayor backed down that afternoon.
616
617 # From IATA SSIM (1996-02):
618 # _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS),
619 # Santa Catarina (SC), Paraná (PR), São Paulo (SP), Rio de Janeiro (RJ),
620 # Espírito Santo (ES), Minas Gerais (MG), Bahia (BA), Goiás (GO),
621 # Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL].
622 # [The last three states are new to this issue of the IATA SSIM.]
623
624 # From Gwillim Law (1996-10-07):
625 # Geography, history (Tocantins was part of Goiás until 1989), and other
914 Rule Brazil 2003 only - Oct 19 0:00 1:00 S
915 # Decree 5,223 (2004-10-01) reestablishes DST in MT.
916 # 5,223 <http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2004/Decreto/D5223.htm>
917 Rule Brazil 2004 only - Nov 2 0:00 1:00 S
918 # Decree 5,539 <http://pcdsh01.on.br/DecHV5539.gif> (2005-09-19),
919 # adopted by the same states as before.
920 Rule Brazil 2005 only - Oct 16 0:00 1:00 S
921 # Decree 5,920 <http://pcdsh01.on.br/DecHV5920.gif> (2006-10-03),
922 # adopted by the same states as before.
923 Rule Brazil 2006 only - Nov 5 0:00 1:00 S
924 Rule Brazil 2007 only - Feb 25 0:00 0 -
925 # Decree 6,212 <http://pcdsh01.on.br/DecHV6212.gif> (2007-09-26),
926 # adopted by the same states as before.
927 Rule Brazil 2007 only - Oct Sun>=8 0:00 1:00 S
928 # From Frederico A. C. Neves (2008-09-10):
929 # According to this decree
930 # http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm
931 # [t]he DST period in Brazil now on will be from the 3rd Oct Sunday to the
932 # 3rd Feb Sunday. There is an exception on the return date when this is
933 # the Carnival Sunday then the return date will be the next Sunday...
934 Rule Brazil 2008 max - Oct Sun>=15 0:00 1:00 S
935 Rule Brazil 2008 2011 - Feb Sun>=15 0:00 0 -
936 Rule Brazil 2012 only - Feb Sun>=22 0:00 0 -
937 Rule Brazil 2013 2014 - Feb Sun>=15 0:00 0 -
938 Rule Brazil 2015 only - Feb Sun>=22 0:00 0 -
939 Rule Brazil 2016 2022 - Feb Sun>=15 0:00 0 -
940 Rule Brazil 2023 only - Feb Sun>=22 0:00 0 -
941 Rule Brazil 2024 2025 - Feb Sun>=15 0:00 0 -
942 Rule Brazil 2026 only - Feb Sun>=22 0:00 0 -
943 Rule Brazil 2027 2033 - Feb Sun>=15 0:00 0 -
944 Rule Brazil 2034 only - Feb Sun>=22 0:00 0 -
945 Rule Brazil 2035 2036 - Feb Sun>=15 0:00 0 -
946 Rule Brazil 2037 only - Feb Sun>=22 0:00 0 -
947 # From Arthur David Olson (2008-09-29):
948 # The next is wrong in some years but is better than nothing.
949 Rule Brazil 2038 max - Feb Sun>=15 0:00 0 -
950
951 # The latest ruleset listed above says that the following states observe DST:
952 # DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP.
953
954 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
955 #
956 # Fernando de Noronha (administratively part of PE)
957 Zone America/Noronha -2:09:40 - LMT 1914
958 -2:00 Brazil -02/-01 1990 Sep 17
959 -2:00 - -02 1999 Sep 30
1074 # Eirunepé, Envira, Ipixuna
1075 Zone America/Eirunepe -4:39:28 - LMT 1914
1076 -5:00 Brazil -05/-04 1988 Sep 12
1077 -5:00 - -05 1993 Sep 28
1078 -5:00 Brazil -05/-04 1994 Sep 22
1079 -5:00 - -05 2008 Jun 24 0:00
1080 -4:00 - -04 2013 Nov 10
1081 -5:00 - -05
1082 #
1083 # Acre (AC)
1084 Zone America/Rio_Branco -4:31:12 - LMT 1914
1085 -5:00 Brazil -05/-04 1988 Sep 12
1086 -5:00 - -05 2008 Jun 24 0:00
1087 -4:00 - -04 2013 Nov 10
1088 -5:00 - -05
1089
1090 # Chile
1091
1092 # From Paul Eggert (2015-04-03):
1093 # Shanks & Pottenger says America/Santiago introduced standard time in
1094 # 1890 and rounds its UTC offset to 70W40; guess that in practice this
1095 # was the same offset as in 1916-1919. It also says Pacific/Easter
1096 # standardized on 109W22 in 1890; assume this didn't change the clocks.
1097 #
1098 # Dates for America/Santiago from 1910 to 2004 are primarily from
1099 # the following source, cited by Oscar van Vlijmen (2006-10-08):
1100 # [1] Chile Law
1101 # http://www.webexhibits.org/daylightsaving/chile.html
1102 # This contains a copy of this official table:
1103 # Cambios en la hora oficial de Chile desde 1900 (retrieved 2008-03-30)
1104 # https://web.archive.org/web/20080330200901/http://www.horaoficial.cl/cambio.htm
1105 # [1] needs several corrections, though.
1106 #
1107 # The first set of corrections is from:
1108 # [2] History of the Official Time of Chile
1109 # http://www.horaoficial.cl/ing/horaof_ing.html (retrieved 2012-03-06). See:
1110 # https://web.archive.org/web/20120306042032/http://www.horaoficial.cl/ing/horaof_ing.html
1111 # This is an English translation of:
1112 # Historia de la hora oficial de Chile (retrieved 2012-10-24). See:
1113 # https://web.archive.org/web/20121024234627/http://www.horaoficial.cl/horaof.htm
1114 # A fancier Spanish version (requiring mouse-clicking) is at:
|
31
32 # From Paul Eggert (2016-12-05):
33 #
34 # Unless otherwise specified, the source for data through 1990 is:
35 # Thomas G. Shanks and Rique Pottenger, The International Atlas (6th edition),
36 # San Diego: ACS Publications, Inc. (2003).
37 # Unfortunately this book contains many errors and cites no sources.
38 #
39 # Many years ago Gwillim Law wrote that a good source
40 # for time zone data was the International Air Transport
41 # Association's Standard Schedules Information Manual (IATA SSIM),
42 # published semiannually. Law sent in several helpful summaries
43 # of the IATA's data after 1990. Except where otherwise noted,
44 # IATA SSIM is the source for entries after 1990.
45 #
46 # For data circa 1899, a common source is:
47 # Milne J. Civil time. Geogr J. 1899 Feb;13(2):173-94.
48 # https://www.jstor.org/stable/1774359
49 #
50 # These tables use numeric abbreviations like -03 and -0330 for
51 # integer hour and minute UT offsets. Although earlier editions used
52 # alphabetic time zone abbreviations, these abbreviations were
53 # invented and did not reflect common practice.
54
55 ###############################################################################
56
57 ###############################################################################
58
59 # Argentina
60
61 # From Bob Devine (1988-01-28):
62 # Argentina: first Sunday in October to first Sunday in April since 1976.
63 # Double Summer time from 1969 to 1974. Switches at midnight.
64
65 # From U. S. Naval Observatory (1988-01-19):
66 # ARGENTINA 3 H BEHIND UTC
67
68 # From Hernan G. Otero (1995-06-26):
69 # I am sending modifications to the Argentine time zone table...
70 # AR was chosen because they are the ISO letters that represent Argentina.
71
585 #
586 # Tierra del Fuego, Antártida e Islas del Atlántico Sur (TF)
587 Zone America/Argentina/Ushuaia -4:33:12 - LMT 1894 Oct 31
588 -4:16:48 - CMT 1920 May
589 -4:00 - -04 1930 Dec
590 -4:00 Arg -04/-03 1969 Oct 5
591 -3:00 Arg -03/-02 1999 Oct 3
592 -4:00 Arg -04/-03 2000 Mar 3
593 -3:00 - -03 2004 May 30
594 -4:00 - -04 2004 Jun 20
595 -3:00 Arg -03/-02 2008 Oct 18
596 -3:00 - -03
597
598 # Aruba
599 Link America/Curacao America/Aruba
600
601 # Bolivia
602 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
603 Zone America/La_Paz -4:32:36 - LMT 1890
604 -4:32:36 - CMT 1931 Oct 15 # Calamarca MT
605 -4:32:36 1:00 BST 1932 Mar 21 # Bolivia ST
606 -4:00 - -04
607
608 # Brazil
609
610 # From Paul Eggert (1993-11-18):
611 # The mayor of Rio recently attempted to change the time zone rules
612 # just in his city, in order to leave more summer time for the tourist trade.
613 # The rule change lasted only part of the day;
614 # the federal government refused to follow the city's rules, and business
615 # was in a chaos, so the mayor backed down that afternoon.
616
617 # From IATA SSIM (1996-02):
618 # _Only_ the following states in BR1 observe DST: Rio Grande do Sul (RS),
619 # Santa Catarina (SC), Paraná (PR), São Paulo (SP), Rio de Janeiro (RJ),
620 # Espírito Santo (ES), Minas Gerais (MG), Bahia (BA), Goiás (GO),
621 # Distrito Federal (DF), Tocantins (TO), Sergipe [SE] and Alagoas [AL].
622 # [The last three states are new to this issue of the IATA SSIM.]
623
624 # From Gwillim Law (1996-10-07):
625 # Geography, history (Tocantins was part of Goiás until 1989), and other
914 Rule Brazil 2003 only - Oct 19 0:00 1:00 S
915 # Decree 5,223 (2004-10-01) reestablishes DST in MT.
916 # 5,223 <http://www.planalto.gov.br/ccivil_03/_Ato2004-2006/2004/Decreto/D5223.htm>
917 Rule Brazil 2004 only - Nov 2 0:00 1:00 S
918 # Decree 5,539 <http://pcdsh01.on.br/DecHV5539.gif> (2005-09-19),
919 # adopted by the same states as before.
920 Rule Brazil 2005 only - Oct 16 0:00 1:00 S
921 # Decree 5,920 <http://pcdsh01.on.br/DecHV5920.gif> (2006-10-03),
922 # adopted by the same states as before.
923 Rule Brazil 2006 only - Nov 5 0:00 1:00 S
924 Rule Brazil 2007 only - Feb 25 0:00 0 -
925 # Decree 6,212 <http://pcdsh01.on.br/DecHV6212.gif> (2007-09-26),
926 # adopted by the same states as before.
927 Rule Brazil 2007 only - Oct Sun>=8 0:00 1:00 S
928 # From Frederico A. C. Neves (2008-09-10):
929 # According to this decree
930 # http://www.planalto.gov.br/ccivil_03/_Ato2007-2010/2008/Decreto/D6558.htm
931 # [t]he DST period in Brazil now on will be from the 3rd Oct Sunday to the
932 # 3rd Feb Sunday. There is an exception on the return date when this is
933 # the Carnival Sunday then the return date will be the next Sunday...
934 Rule Brazil 2008 2017 - Oct Sun>=15 0:00 1:00 S
935 Rule Brazil 2008 2011 - Feb Sun>=15 0:00 0 -
936 # Decree 7,584 <http://pcdsh01.on.br/HVdecreto7584_20111013.jpg> (2011-10-13)
937 # added Bahia.
938 Rule Brazil 2012 only - Feb Sun>=22 0:00 0 -
939 # Decree 7,826 <http://pcdsh01.on.br/HVdecreto7826_20121015.jpg> (2012-10-15)
940 # removed Bahia and added Tocantins.
941 # Decree 8,112 <http://pcdsh01.on.br/HVdecreto8112_20130930.JPG> (2013-09-30)
942 # removed Tocantins.
943 Rule Brazil 2013 2014 - Feb Sun>=15 0:00 0 -
944 Rule Brazil 2015 only - Feb Sun>=22 0:00 0 -
945 Rule Brazil 2016 2022 - Feb Sun>=15 0:00 0 -
946 # From Steffen Thorsen (2017-12-18):
947 # According to many media sources, next year's DST start in Brazil will move to
948 # the first Sunday of November, and it will stay like that for the years after.
949 # ... https://www.timeanddate.com/news/time/brazil-delays-dst-2018.html
950 # From Steffen Thorsen (2017-12-20):
951 # http://www.planalto.gov.br/ccivil_03/_ato2015-2018/2017/decreto/D9242.htm
952 Rule Brazil 2018 max - Nov Sun>=1 0:00 1:00 S
953 Rule Brazil 2023 only - Feb Sun>=22 0:00 0 -
954 Rule Brazil 2024 2025 - Feb Sun>=15 0:00 0 -
955 Rule Brazil 2026 only - Feb Sun>=22 0:00 0 -
956 Rule Brazil 2027 2033 - Feb Sun>=15 0:00 0 -
957 Rule Brazil 2034 only - Feb Sun>=22 0:00 0 -
958 Rule Brazil 2035 2036 - Feb Sun>=15 0:00 0 -
959 Rule Brazil 2037 only - Feb Sun>=22 0:00 0 -
960 # From Arthur David Olson (2008-09-29):
961 # The next is wrong in some years but is better than nothing.
962 Rule Brazil 2038 max - Feb Sun>=15 0:00 0 -
963
964 # The latest ruleset listed above says that the following states observe DST:
965 # DF, ES, GO, MG, MS, MT, PR, RJ, RS, SC, SP.
966
967 # Zone NAME GMTOFF RULES FORMAT [UNTIL]
968 #
969 # Fernando de Noronha (administratively part of PE)
970 Zone America/Noronha -2:09:40 - LMT 1914
971 -2:00 Brazil -02/-01 1990 Sep 17
972 -2:00 - -02 1999 Sep 30
1087 # Eirunepé, Envira, Ipixuna
1088 Zone America/Eirunepe -4:39:28 - LMT 1914
1089 -5:00 Brazil -05/-04 1988 Sep 12
1090 -5:00 - -05 1993 Sep 28
1091 -5:00 Brazil -05/-04 1994 Sep 22
1092 -5:00 - -05 2008 Jun 24 0:00
1093 -4:00 - -04 2013 Nov 10
1094 -5:00 - -05
1095 #
1096 # Acre (AC)
1097 Zone America/Rio_Branco -4:31:12 - LMT 1914
1098 -5:00 Brazil -05/-04 1988 Sep 12
1099 -5:00 - -05 2008 Jun 24 0:00
1100 -4:00 - -04 2013 Nov 10
1101 -5:00 - -05
1102
1103 # Chile
1104
1105 # From Paul Eggert (2015-04-03):
1106 # Shanks & Pottenger says America/Santiago introduced standard time in
1107 # 1890 and rounds its UT offset to 70W40; guess that in practice this
1108 # was the same offset as in 1916-1919. It also says Pacific/Easter
1109 # standardized on 109W22 in 1890; assume this didn't change the clocks.
1110 #
1111 # Dates for America/Santiago from 1910 to 2004 are primarily from
1112 # the following source, cited by Oscar van Vlijmen (2006-10-08):
1113 # [1] Chile Law
1114 # http://www.webexhibits.org/daylightsaving/chile.html
1115 # This contains a copy of this official table:
1116 # Cambios en la hora oficial de Chile desde 1900 (retrieved 2008-03-30)
1117 # https://web.archive.org/web/20080330200901/http://www.horaoficial.cl/cambio.htm
1118 # [1] needs several corrections, though.
1119 #
1120 # The first set of corrections is from:
1121 # [2] History of the Official Time of Chile
1122 # http://www.horaoficial.cl/ing/horaof_ing.html (retrieved 2012-03-06). See:
1123 # https://web.archive.org/web/20120306042032/http://www.horaoficial.cl/ing/horaof_ing.html
1124 # This is an English translation of:
1125 # Historia de la hora oficial de Chile (retrieved 2012-10-24). See:
1126 # https://web.archive.org/web/20121024234627/http://www.horaoficial.cl/horaof.htm
1127 # A fancier Spanish version (requiring mouse-clicking) is at:
|