1# @(#)northamerica 7.51
2# $FreeBSD: head/share/zoneinfo/northamerica 58787 2000-03-29 14:01:46Z ru $
3# also includes Central America and the Caribbean
4
5# This data is by no means authoritative; if you think you know better,
6# go ahead and edit the file (and please send any changes to
7# tz@elsie.nci.nih.gov for general use in the future).
8
9# From Paul Eggert <eggert@twinsun.com> (1999-03-22):
10# A reliable and entertaining source about time zones is
11# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
12
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998 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
999 -8:00 NT_YK P%sT
1000
1001
1002###############################################################################
1003
1004# Mexico
1005
1006# From Guy Harris:
1007# Rules are from the Official Airline Guide, Worldwide Edition, for 1987.
1008# Rules [before] 1987 are unknown.
1009# The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana
1010# observe DST." This is presumably Baja California Norte, above 28th parallel,
1011# as listed there; [there is also] "Baja California Sur and N. Pacific
1012# Coast (States of Sinaloa and Sonora)."
1013
1014# From Bob Devine (1988-01-28):
1015# The Federal District (where Mexico City is) has observed [DST] several
1016# times but not recently.
1017#
1018# I don't where to draw the line in the North Baja area. 28th latitude
1019# sounds good -- but it may be higher (how far [d]o radio stations from
1020# San Diego affect culture?).
1021#
1022# The dates of DST probably go back to 1981. The rules are the same as
1023# US's. This is going to be a headache for US presidential electi[o]n years!
1024
1025# From Arthur David Olson (1988-02-13)
1026# Since the 1981 starting date is only "probable," we'll keep the 1987
1027# starting date below.
1028
1029# From U. S. Naval Observatory (1989-01-19):
1030# MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND
1031# MEXICO BAJA CAL N N. PACIFIC COAST (STATES
1032# MEXICO BAJA CAL N OF SINALOA AND SONORA)
1033# MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLEL APR 3
1034# MEXICO BAJA CAL N - OCT 29
1035# MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLEL APR 3
1036# MEXICO BAJA CAL N - 0CT 29
1037# MEXICO 6 H BEHIND UTC STATES OF DURANGO,
1038# MEXICO COAHUILA, NUEVO LEON,
1039# MEXICO TAMAULIPAS
1040# MEXICO 5 H BEHIND UTC STATES OF DURANGO,
1041# MEXICO COAHUILA, NUEVO LEON,
1042# MEXICO TAMAULIPAS APR 3 - OCT 29
1043# MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF
1044# MEXICO CAMPECHE, QUINTANA ROO AND
1045# MEXICO YUCATAN
1046
1047# From Arthur David Olson (1989-01-21):
1048# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
1049# USNO claims there should be four Mexican zones rather than three:
1050# a zone that's GMT-8 with DST; a zone that's always GMT-7;
1051# a zone that's GMT-6 with DST; and a zone that's always GMT-6.
1052
1053# From Alan Perry <alan.perry@eng.sun.com> (1996-02-15):
1054# A guy from our Mexico subsidiary finally found the Presidential Decree
1055# outlining the timezone changes in Mexico.
1056#
1057# ------------- Begin Forwarded Message -------------
1058#
1059# I finally got my hands on the Official Presidential Decree that sets up the
1060# rules for the DST changes. The rules are:
--- 28 unchanged lines hidden (view full) ---
1089# (i.e. UTC -0600 and -0500 as of 1998-08-02).
1090
1091# From Rives McDow (2000-01-10):
1092# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
1093# zone 5 hours from the International Date Line, and will not observe daylight
1094# savings time so as to stay on the same time zone as the southern part of
1095# Arizona year round.
1096
1097# From Shanks:
1098# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1099Rule Mexico 1939 only - Feb 5 0:00 1:00 D
1100Rule Mexico 1939 only - Jun 25 0:00 0 S
1101Rule Mexico 1940 only - Dec 9 0:00 1:00 D
1102Rule Mexico 1941 only - Apr 1 0:00 0 S
1103Rule Mexico 1943 only - Dec 16 0:00 1:00 D
1104Rule Mexico 1944 only - May 1 0:00 0 S
1105Rule Mexico 1950 only - Feb 12 0:00 1:00 D
1106Rule Mexico 1950 only - Jul 30 0:00 0 S
1107Rule Mexico 1996 max - Apr Sun>=1 2:00 1:00 D
1108Rule Mexico 1996 max - Oct lastSun 2:00 0 S
1109#
1110Rule BajaN 1954 1961 - Apr lastSun 2:00 1:00 D
1111Rule BajaN 1954 1961 - Sep lastSun 2:00 0 S
1112# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1113# Quintana Roo
1114Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
1115 -6:00 - CST 1996
1116 -6:00 Mexico C%sT 1997 Oct lastSun 2:00
1117 -5:00 Mexico E%sT 1998 Aug 2 2:00
1118 -6:00 Mexico C%sT
1119# Central Mexico
1120Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
1121 -7:00 - MST 1927 Jun 10 23:00
1122 -6:00 - CST 1930 Nov 15
1123 -7:00 - MST 1931 May 1 23:00
1124 -6:00 - CST 1931 Oct
1125 -7:00 - MST 1932 Mar 30 23:00
1126 -6:00 Mexico C%sT
--- 10 unchanged lines hidden (view full) ---
1137 -7:00 Mexico M%sT
1138# Sonora
1139Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
1140 -7:00 - MST 1927 Jun 10 23:00
1141 -6:00 - CST 1930 Nov 15
1142 -7:00 - MST 1931 May 1 23:00
1143 -6:00 - CST 1931 Oct
1144 -7:00 - MST 1932 Mar 30 23:00
1145 -6:00 - CST 1942 Apr
1146 -7:00 - MST 1949 Jan 14
1147 -8:00 - PST 1970
1148 -7:00 Mexico M%sT 1999
1149 -7:00 - MST
1150# S Baja California, Nayarit, Sinaloa
1151Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
1152 -7:00 - MST 1927 Jun 10 23:00
1153 -6:00 - CST 1930 Nov 15
1154 -7:00 - MST 1931 May 1 23:00
1155 -6:00 - CST 1931 Oct
1156 -7:00 - MST 1932 Mar 30 23:00
1157 -6:00 - CST 1942 Apr
1158 -7:00 - MST 1949 Jan 14
1159 -8:00 - PST 1970
1160 -7:00 Mexico M%sT
1161# Baja California
1162Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
1163 -8:00 - PST 1927 Jun 10 23:00
1164 -7:00 - MST 1930 Nov 16
1165 -8:00 - PST 1942 Apr
1166 -7:00 - MST 1949 Jan 14
1167 -8:00 BajaN P%sT 1976
1168 -8:00 US P%sT 1996
1169 -8:00 Mexico P%sT
1170#
1171# Revillagigedo Is
1172# no information
1173
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2# $FreeBSD: head/share/zoneinfo/northamerica 58787 2000-03-29 14:01:46Z ru $
3# also includes Central America and the Caribbean
4
5# This data is by no means authoritative; if you think you know better,
6# go ahead and edit the file (and please send any changes to
7# tz@elsie.nci.nih.gov for general use in the future).
8
9# From Paul Eggert <eggert@twinsun.com> (1999-03-22):
10# A reliable and entertaining source about time zones is
11# Derek Howse, Greenwich time and longitude, Philip Wilson Publishers (1997).
12
--- 985 unchanged lines hidden (view full) ---
998 -9:00 NT_YK Y%sT 1973 Oct 28 0:00
999 -8:00 NT_YK P%sT
1000
1001
1002###############################################################################
1003
1004# Mexico
1005
1006# From Guy Harris:
1007# Rules are from the Official Airline Guide, Worldwide Edition, for 1987.
1008# Rules [before] 1987 are unknown.
1009# The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana
1010# observe DST." This is presumably Baja California Norte, above 28th parallel,
1011# as listed there; [there is also] "Baja California Sur and N. Pacific
1012# Coast (States of Sinaloa and Sonora)."
1013
1014# From Bob Devine (1988-01-28):
1015# The Federal District (where Mexico City is) has observed [DST] several
1016# times but not recently.
1017#
1018# I don't where to draw the line in the North Baja area. 28th latitude
1019# sounds good -- but it may be higher (how far [d]o radio stations from
1020# San Diego affect culture?).
1021#
1022# The dates of DST probably go back to 1981. The rules are the same as
1023# US's. This is going to be a headache for US presidential electi[o]n years!
1024
1025# From Arthur David Olson (1988-02-13)
1026# Since the 1981 starting date is only "probable," we'll keep the 1987
1027# starting date below.
1028
1029# From U. S. Naval Observatory (1989-01-19):
1030# MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND
1031# MEXICO BAJA CAL N N. PACIFIC COAST (STATES
1032# MEXICO BAJA CAL N OF SINALOA AND SONORA)
1033# MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLEL APR 3
1034# MEXICO BAJA CAL N - OCT 29
1035# MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLEL APR 3
1036# MEXICO BAJA CAL N - 0CT 29
1037# MEXICO 6 H BEHIND UTC STATES OF DURANGO,
1038# MEXICO COAHUILA, NUEVO LEON,
1039# MEXICO TAMAULIPAS
1040# MEXICO 5 H BEHIND UTC STATES OF DURANGO,
1041# MEXICO COAHUILA, NUEVO LEON,
1042# MEXICO TAMAULIPAS APR 3 - OCT 29
1043# MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF
1044# MEXICO CAMPECHE, QUINTANA ROO AND
1045# MEXICO YUCATAN
1046
1047# From Arthur David Olson (1989-01-21):
1048# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
1049# USNO claims there should be four Mexican zones rather than three:
1050# a zone that's GMT-8 with DST; a zone that's always GMT-7;
1051# a zone that's GMT-6 with DST; and a zone that's always GMT-6.
1052
1053# From Alan Perry <alan.perry@eng.sun.com> (1996-02-15):
1054# A guy from our Mexico subsidiary finally found the Presidential Decree
1055# outlining the timezone changes in Mexico.
1056#
1057# ------------- Begin Forwarded Message -------------
1058#
1059# I finally got my hands on the Official Presidential Decree that sets up the
1060# rules for the DST changes. The rules are:
--- 28 unchanged lines hidden (view full) ---
1089# (i.e. UTC -0600 and -0500 as of 1998-08-02).
1090
1091# From Rives McDow (2000-01-10):
1092# Effective April 4, 1999 at 2:00 AM local time, Sonora changed to the time
1093# zone 5 hours from the International Date Line, and will not observe daylight
1094# savings time so as to stay on the same time zone as the southern part of
1095# Arizona year round.
1096
1097# From Shanks:
1098# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
1099Rule Mexico 1939 only - Feb 5 0:00 1:00 D
1100Rule Mexico 1939 only - Jun 25 0:00 0 S
1101Rule Mexico 1940 only - Dec 9 0:00 1:00 D
1102Rule Mexico 1941 only - Apr 1 0:00 0 S
1103Rule Mexico 1943 only - Dec 16 0:00 1:00 D
1104Rule Mexico 1944 only - May 1 0:00 0 S
1105Rule Mexico 1950 only - Feb 12 0:00 1:00 D
1106Rule Mexico 1950 only - Jul 30 0:00 0 S
1107Rule Mexico 1996 max - Apr Sun>=1 2:00 1:00 D
1108Rule Mexico 1996 max - Oct lastSun 2:00 0 S
1109#
1110Rule BajaN 1954 1961 - Apr lastSun 2:00 1:00 D
1111Rule BajaN 1954 1961 - Sep lastSun 2:00 0 S
1112# Zone NAME GMTOFF RULES FORMAT [UNTIL]
1113# Quintana Roo
1114Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
1115 -6:00 - CST 1996
1116 -6:00 Mexico C%sT 1997 Oct lastSun 2:00
1117 -5:00 Mexico E%sT 1998 Aug 2 2:00
1118 -6:00 Mexico C%sT
1119# Central Mexico
1120Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
1121 -7:00 - MST 1927 Jun 10 23:00
1122 -6:00 - CST 1930 Nov 15
1123 -7:00 - MST 1931 May 1 23:00
1124 -6:00 - CST 1931 Oct
1125 -7:00 - MST 1932 Mar 30 23:00
1126 -6:00 Mexico C%sT
--- 10 unchanged lines hidden (view full) ---
1137 -7:00 Mexico M%sT
1138# Sonora
1139Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
1140 -7:00 - MST 1927 Jun 10 23:00
1141 -6:00 - CST 1930 Nov 15
1142 -7:00 - MST 1931 May 1 23:00
1143 -6:00 - CST 1931 Oct
1144 -7:00 - MST 1932 Mar 30 23:00
1145 -6:00 - CST 1942 Apr
1146 -7:00 - MST 1949 Jan 14
1147 -8:00 - PST 1970
1148 -7:00 Mexico M%sT 1999
1149 -7:00 - MST
1150# S Baja California, Nayarit, Sinaloa
1151Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
1152 -7:00 - MST 1927 Jun 10 23:00
1153 -6:00 - CST 1930 Nov 15
1154 -7:00 - MST 1931 May 1 23:00
1155 -6:00 - CST 1931 Oct
1156 -7:00 - MST 1932 Mar 30 23:00
1157 -6:00 - CST 1942 Apr
1158 -7:00 - MST 1949 Jan 14
1159 -8:00 - PST 1970
1160 -7:00 Mexico M%sT
1161# Baja California
1162Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
1163 -8:00 - PST 1927 Jun 10 23:00
1164 -7:00 - MST 1930 Nov 16
1165 -8:00 - PST 1942 Apr
1166 -7:00 - MST 1949 Jan 14
1167 -8:00 BajaN P%sT 1976
1168 -8:00 US P%sT 1996
1169 -8:00 Mexico P%sT
1170#
1171# Revillagigedo Is
1172# no information
1173
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