diff options
Diffstat (limited to 'timezone/northamerica')
| -rw-r--r-- | timezone/northamerica | 92 |
1 files changed, 43 insertions, 49 deletions
diff --git a/timezone/northamerica b/timezone/northamerica index 845587fa82..654450a9c5 100644 --- a/timezone/northamerica +++ b/timezone/northamerica @@ -1,4 +1,4 @@ -# @(#)northamerica 7.51 +# @(#)northamerica 7.52 # also includes Central America and the Caribbean # This data is by no means authoritative; if you think you know better, @@ -1002,52 +1002,35 @@ Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 # Mexico -# From Guy Harris: -# Rules are from the Official Airline Guide, Worldwide Edition, for 1987. -# Rules [before] 1987 are unknown. -# The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana -# observe DST." This is presumably Baja California Norte, above 28th parallel, -# as listed there; [there is also] "Baja California Sur and N. Pacific -# Coast (States of Sinaloa and Sonora)." - -# From Bob Devine (1988-01-28): -# The Federal District (where Mexico City is) has observed [DST] several -# times but not recently. +# Gwillim Law reports this source for daylight saving time in Mexico: +# <a href="http://www.spin.com.mx/verano/"> +# Daylight saving time * SPIN-Internet (in Spanish) +# </a> +# Law (2000-03-09) translates it as follows: # -# I don't where to draw the line in the North Baja area. 28th latitude -# sounds good -- but it may be higher (how far [d]o radio stations from -# San Diego affect culture?). +# Standard time effective in Mexico takes its origin in the +# presidential decree of April 24, 1942. The time of the 120th +# meridian applies to the state of Baja California; of the 105th +# meridian to the states of Baja California Sur, Sonora, Sinaloa, and +# Nayarit; and the time of the 90th meridian to the rest of the +# country. # -# The dates of DST probably go back to 1981. The rules are the same as -# US's. This is going to be a headache for US presidential electi[o]n years! - -# From Arthur David Olson (1988-02-13) -# Since the 1981 starting date is only "probable," we'll keep the 1987 -# starting date below. - -# From U. S. Naval Observatory (1989-01-19): -# MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND -# MEXICO BAJA CAL N N. PACIFIC COAST (STATES -# MEXICO BAJA CAL N OF SINALOA AND SONORA) -# MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLEL APR 3 -# MEXICO BAJA CAL N - OCT 29 -# MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLEL APR 3 -# MEXICO BAJA CAL N - 0CT 29 -# MEXICO 6 H BEHIND UTC STATES OF DURANGO, -# MEXICO COAHUILA, NUEVO LEON, -# MEXICO TAMAULIPAS -# MEXICO 5 H BEHIND UTC STATES OF DURANGO, -# MEXICO COAHUILA, NUEVO LEON, -# MEXICO TAMAULIPAS APR 3 - OCT 29 -# MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF -# MEXICO CAMPECHE, QUINTANA ROO AND -# MEXICO YUCATAN +# In the country, there have been several attempts made to adapt +# standard time with the object of arriving at a better use of +# daylight for social and economic activities. In December, 1981 a +# permanent time zone was decreed for the states of Campeche, Yucatan, +# and Quintana Roo, displacing them from the 90th to the 75th +# meridian. This disposition was annulled on December 2, 1982. +# +# In 1988 a Summer Time was established for the states of Tamaulipas, +# Nuevo Leon, Coahuila, and Durango, which meant that from the first +# Sunday in April to the last [Sunday] of October those states +# displaced their time from the 90th to the 75th meridian. That +# disposition lasted for one year. -# From Arthur David Olson (1989-01-21): -# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem. -# USNO claims there should be four Mexican zones rather than three: -# a zone that's GMT-8 with DST; a zone that's always GMT-7; -# a zone that's GMT-6 with DST; and a zone that's always GMT-6. +# From Paul Eggert (2000-07-26): +# Shanks gives 1942-04-01 instead of 1942-04-24, and omits the 1981 +# and 1988 DST experiments. Go with spin.com.mx. # From Alan Perry <alan.perry@eng.sun.com> (1996-02-15): # A guy from our Mexico subsidiary finally found the Presidential Decree @@ -1093,7 +1076,6 @@ Zone America/Dawson -9:17:40 - LMT 1900 Aug 20 # savings time so as to stay on the same time zone as the southern part of # Arizona year round. -# From Shanks: # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S Rule Mexico 1939 only - Feb 5 0:00 1:00 D Rule Mexico 1939 only - Jun 25 0:00 0 S @@ -1111,10 +1093,22 @@ Rule BajaN 1954 1961 - Sep lastSun 2:00 0 S # Zone NAME GMTOFF RULES FORMAT [UNTIL] # Quintana Roo Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56 + -6:00 - CST 1981 Dec + -5:00 - EST 1982 Dec 2 -6:00 - CST 1996 -6:00 Mexico C%sT 1997 Oct lastSun 2:00 -5:00 Mexico E%sT 1998 Aug 2 2:00 -6:00 Mexico C%sT +# Campeche, Yucatan +Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32 + -6:00 - CST 1981 Dec + -5:00 - EST 1982 Dec 2 + -6:00 Mexico C%sT +# Coahuila, Durango, Nuevo Leon, Tamaulipas +Zone America/Monterrey -6:41:16 - LMT 1922 Jan 1 0:01:32 + -6:00 - CST 1988 + -6:00 US C%sT 1989 + -6:00 Mexico C%sT # Central Mexico Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24 -7:00 - MST 1927 Jun 10 23:00 @@ -1141,19 +1135,19 @@ Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08 -7:00 - MST 1931 May 1 23:00 -6:00 - CST 1931 Oct -7:00 - MST 1932 Mar 30 23:00 - -6:00 - CST 1942 Apr + -6:00 - CST 1942 Apr 24 -7:00 - MST 1949 Jan 14 -8:00 - PST 1970 -7:00 Mexico M%sT 1999 -7:00 - MST -# S Baja California, Nayarit, Sinaloa +# Baja California Sur, Nayarit, Sinaloa Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 -7:00 - MST 1927 Jun 10 23:00 -6:00 - CST 1930 Nov 15 -7:00 - MST 1931 May 1 23:00 -6:00 - CST 1931 Oct -7:00 - MST 1932 Mar 30 23:00 - -6:00 - CST 1942 Apr + -6:00 - CST 1942 Apr 24 -7:00 - MST 1949 Jan 14 -8:00 - PST 1970 -7:00 Mexico M%sT @@ -1161,7 +1155,7 @@ Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20 Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56 -8:00 - PST 1927 Jun 10 23:00 -7:00 - MST 1930 Nov 16 - -8:00 - PST 1942 Apr + -8:00 - PST 1942 Apr 24 -7:00 - MST 1949 Jan 14 -8:00 BajaN P%sT 1976 -8:00 US P%sT 1996 |