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Eggert mods
SCCS-file: northamerica SCCS-SID: 7.52
This commit is contained in:
Arthur David Olson
committed by
Paul Eggert
Paul Eggert
parent
964758e059
commit
c081b4fd55
+42
-48
@@ -1002,52 +1002,35 @@ Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
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# Mexico
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# From Guy Harris:
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# Rules are from the Official Airline Guide, Worldwide Edition, for 1987.
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# Rules [before] 1987 are unknown.
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# The comments in the OAG say "Only Ensenada, Mexicale, San Felipe and Tijuana
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# observe DST." This is presumably Baja California Norte, above 28th parallel,
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# as listed there; [there is also] "Baja California Sur and N. Pacific
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# Coast (States of Sinaloa and Sonora)."
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# From Bob Devine (1988-01-28):
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# The Federal District (where Mexico City is) has observed [DST] several
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# times but not recently.
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# Gwillim Law reports this source for daylight saving time in Mexico:
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# <a href="http://www.spin.com.mx/verano/">
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# Daylight saving time * SPIN-Internet (in Spanish)
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# </a>
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# Law (2000-03-09) translates it as follows:
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#
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# I don't where to draw the line in the North Baja area. 28th latitude
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# sounds good -- but it may be higher (how far [d]o radio stations from
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# San Diego affect culture?).
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# Standard time effective in Mexico takes its origin in the
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# presidential decree of April 24, 1942. The time of the 120th
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# meridian applies to the state of Baja California; of the 105th
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# meridian to the states of Baja California Sur, Sonora, Sinaloa, and
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# Nayarit; and the time of the 90th meridian to the rest of the
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# country.
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#
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# The dates of DST probably go back to 1981. The rules are the same as
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# US's. This is going to be a headache for US presidential electi[o]n years!
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# In the country, there have been several attempts made to adapt
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# standard time with the object of arriving at a better use of
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# daylight for social and economic activities. In December, 1981 a
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# permanent time zone was decreed for the states of Campeche, Yucatan,
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# and Quintana Roo, displacing them from the 90th to the 75th
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# meridian. This disposition was annulled on December 2, 1982.
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#
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# In 1988 a Summer Time was established for the states of Tamaulipas,
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# Nuevo Leon, Coahuila, and Durango, which meant that from the first
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# Sunday in April to the last [Sunday] of October those states
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# displaced their time from the 90th to the 75th meridian. That
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# disposition lasted for one year.
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# From Arthur David Olson (1988-02-13)
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# Since the 1981 starting date is only "probable," we'll keep the 1987
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# starting date below.
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# From U. S. Naval Observatory (1989-01-19):
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# MEXICO BAJA CAL N 7 H BEHIND UTC BAJA CALIFORNIA SUR AND
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# MEXICO BAJA CAL N N. PACIFIC COAST (STATES
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# MEXICO BAJA CAL N OF SINALOA AND SONORA)
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# MEXICO BAJA CAL N 8 H BEHIND UTC ABOVE 28TH PARALLEL APR 3
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# MEXICO BAJA CAL N - OCT 29
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# MEXICO BAJA CAL N 7 H BEHIND UTC ABOVE 28TH PARALLEL APR 3
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# MEXICO BAJA CAL N - 0CT 29
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# MEXICO 6 H BEHIND UTC STATES OF DURANGO,
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# MEXICO COAHUILA, NUEVO LEON,
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# MEXICO TAMAULIPAS
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# MEXICO 5 H BEHIND UTC STATES OF DURANGO,
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# MEXICO COAHUILA, NUEVO LEON,
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# MEXICO TAMAULIPAS APR 3 - OCT 29
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# MEXICO 6 H BEHIND UTC GENERAL MEXICO, STATES OF
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# MEXICO CAMPECHE, QUINTANA ROO AND
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# MEXICO YUCATAN
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# From Arthur David Olson (1989-01-21):
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# April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
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# USNO claims there should be four Mexican zones rather than three:
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# a zone that's GMT-8 with DST; a zone that's always GMT-7;
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# a zone that's GMT-6 with DST; and a zone that's always GMT-6.
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# From Paul Eggert (2000-07-26):
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# Shanks gives 1942-04-01 instead of 1942-04-24, and omits the 1981
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# and 1988 DST experiments. Go with spin.com.mx.
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# From Alan Perry <alan.perry@eng.sun.com> (1996-02-15):
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# A guy from our Mexico subsidiary finally found the Presidential Decree
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@@ -1093,7 +1076,6 @@ Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
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# savings time so as to stay on the same time zone as the southern part of
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# Arizona year round.
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# From Shanks:
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# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
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Rule Mexico 1939 only - Feb 5 0:00 1:00 D
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Rule Mexico 1939 only - Jun 25 0:00 0 S
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@@ -1111,10 +1093,22 @@ Rule BajaN 1954 1961 - Sep lastSun 2:00 0 S
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# Zone NAME GMTOFF RULES FORMAT [UNTIL]
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# Quintana Roo
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Zone America/Cancun -5:47:04 - LMT 1922 Jan 1 0:12:56
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-6:00 - CST 1981 Dec
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-5:00 - EST 1982 Dec 2
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-6:00 - CST 1996
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-6:00 Mexico C%sT 1997 Oct lastSun 2:00
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-5:00 Mexico E%sT 1998 Aug 2 2:00
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-6:00 Mexico C%sT
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# Campeche, Yucatan
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Zone America/Merida -5:58:28 - LMT 1922 Jan 1 0:01:32
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-6:00 - CST 1981 Dec
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-5:00 - EST 1982 Dec 2
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-6:00 Mexico C%sT
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# Coahuila, Durango, Nuevo Leon, Tamaulipas
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Zone America/Monterrey -6:41:16 - LMT 1922 Jan 1 0:01:32
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-6:00 - CST 1988
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-6:00 US C%sT 1989
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-6:00 Mexico C%sT
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# Central Mexico
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Zone America/Mexico_City -6:36:36 - LMT 1922 Jan 1 0:23:24
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-7:00 - MST 1927 Jun 10 23:00
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@@ -1141,19 +1135,19 @@ Zone America/Hermosillo -7:23:52 - LMT 1921 Dec 31 23:36:08
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-7:00 - MST 1931 May 1 23:00
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-6:00 - CST 1931 Oct
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-7:00 - MST 1932 Mar 30 23:00
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-6:00 - CST 1942 Apr
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-6:00 - CST 1942 Apr 24
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-7:00 - MST 1949 Jan 14
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-8:00 - PST 1970
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-7:00 Mexico M%sT 1999
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-7:00 - MST
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# S Baja California, Nayarit, Sinaloa
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# Baja California Sur, Nayarit, Sinaloa
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Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
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-7:00 - MST 1927 Jun 10 23:00
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-6:00 - CST 1930 Nov 15
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-7:00 - MST 1931 May 1 23:00
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-6:00 - CST 1931 Oct
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-7:00 - MST 1932 Mar 30 23:00
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-6:00 - CST 1942 Apr
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-6:00 - CST 1942 Apr 24
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-7:00 - MST 1949 Jan 14
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-8:00 - PST 1970
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-7:00 Mexico M%sT
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@@ -1161,7 +1155,7 @@ Zone America/Mazatlan -7:05:40 - LMT 1921 Dec 31 23:54:20
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Zone America/Tijuana -7:48:04 - LMT 1922 Jan 1 0:11:56
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-8:00 - PST 1927 Jun 10 23:00
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-7:00 - MST 1930 Nov 16
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-8:00 - PST 1942 Apr
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-8:00 - PST 1942 Apr 24
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-7:00 - MST 1949 Jan 14
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-8:00 BajaN P%sT 1976
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-8:00 US P%sT 1996
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