proposed tz changes for Haiti, Sri Lanka, and Canada

Paul Eggert eggert at CS.UCLA.EDU
Fri Apr 14 10:28:17 UTC 2006


Here are proposed changes to the tz database that I hope finishes off
the usual March madness of DST rule changes.  As I write, the tz
database is incorrect for current time stamps in Haiti (for some
months) and for Sri Lanka (for the next 8 hours or so) so it's time to
get these changes out the door.

* Haiti observes DST this year, and probably in the future.
  (Thanks to Steffen Thorsen for this info.)

* The Sri Lanka time zone change from +06:00 to +05:30 occurs at
  April 15 00:30 local time, not at April 14 00:00.  (Thanks to
  Jesper Norgaard Welen for this info.)

* It seems it's safer to predict that all of Canada will adopt US DST
  rules next year, than to predict, as we did, that there will be some
  holdouts.  (Thanks to Chris Walton for this info.)

* From 1967 through 1986, Manitoba's fall transitions were at
  03:00 local time, not 02:00.  (THanks to Rob Douglas and 
  Chris Walton for this info.)

===================================================================
RCS file: RCS/asia,v
retrieving revision 2006.3
retrieving revision 2006.3.0.1
diff -pu -r2006.3 -r2006.3.0.1
--- asia	2006/04/03 14:04:44	2006.3
+++ asia	2006/04/14 10:17:35	2006.3.0.1
@@ -1526,10 +1526,10 @@ Zone	Asia/Singapore	6:55:25 -	LMT	1901 J
 # With effect from 12.30 a.m. on 26th October 1996
 # Sri Lanka will be six (06) hours ahead of GMT.
 
-# From Petr Machata (2006-03-09):
-# It was brought to my attention that Sri Lanka is going to change
-# timezone from GMT+6:00 to GMT+5:30, quite soon at Apr/13:
-# http://www.hindu.com/thehindu/holnus/001200603042035.htm
+# From Jesper Norgaard Welen (2006-04-14), quoting Sri Lanka News Online
+# <http://news.sinhalaya.com/wmview.php?ArtID=11002> (2006-04-13):
+# 0030 hrs on April 15, 2006 (midnight of April 14, 2006 +30 minutes)
+# at present, become 2400 hours of April 14, 2006 (midnight of April 14, 2006).
 
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone	Asia/Colombo	5:19:24 -	LMT	1880
@@ -1539,7 +1539,7 @@ Zone	Asia/Colombo	5:19:24 -	LMT	1880
 			5:30	1:00	IST	1945 Oct 16 2:00
 			5:30	-	IST	1996 May 25 0:00
 			6:30	-	LKT	1996 Oct 26 0:30
-			6:00	-	LKT	2006 Apr 14
+			6:00	-	LKT	2006 Apr 15 0:30
 			5:30	-	IST
 
 # Syria
===================================================================
RCS file: RCS/northamerica,v
retrieving revision 2006.3
retrieving revision 2006.3.0.1
diff -pu -r2006.3 -r2006.3.0.1
--- northamerica	2006/04/03 14:07:15	2006.3
+++ northamerica	2006/04/14 10:17:35	2006.3.0.1
@@ -895,7 +895,13 @@ Zone America/Menominee	-5:50:27 -	LMT	18
 # Unless otherwise specified, the data for Canada are all from Shanks
 # & Pottenger.
 
-# From Paul Eggert (2006-03-22):
+# From Chris Walton (2006-04-01):
+# The British Columbia government announced yesterday that it will
+# adjust daylight savings next year to align with changes in the
+# U.S. and the rest of Canada....
+# http://www2.news.gov.bc.ca/news_releases_2005-2009/2006AG0014-000330.htm
+
+# From Paul Eggert (2006-04-09):
 # H. David Matthews and Mary Vincent's map
 # <a href="http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp">
 # "It's about TIME", _Canadian Geographic_ (September-October 1998)
@@ -916,17 +922,7 @@ Zone America/Menominee	-5:50:27 -	LMT	18
 # had agreed; see <http://www.cbc.ca/pei/story/pe_daylight_20051207.html>
 # (2005-12-07).  It also reported that Alberta will fall into line; see
 # <http://www.cbc.ca/calgary/story/ca_daylight20060202.html> (2006-02-02).
-#
-# To reflect all this, the Canada, Edm, and Winn rules have been
-# adjusted to agree with the 2007 US change.  This means we assume
-# most of Canada will fall into line.  However, British Columbia,
-# Newfoundland, Northwest Territories, and Yukon already have separate
-# rules in our database, so for now we'll leave them alone, which
-# means that we currently assume these regions will not change their
-# rules and will disagree with the US starting in 2007.  This
-# assumption is probably incorrect, with the possible exception of
-# Newfoundland.  We plan to adjust the Vanc, StJohns, and NT_YK
-# rules as the corresponding provinces make their announcements.
+# For now, assume all of Canada will fall into line.
 
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 Rule	Canada	1918	only	-	Apr	14	2:00	1:00	D
@@ -976,9 +972,15 @@ Rule	StJohns	1960	1986	-	Oct	lastSun	2:0
 # INMS (2000-09-12) says that, since 1988 at least, Newfoundland switches
 # at 00:01 local time.  For now, assume it started in 1987.
 Rule	StJohns	1987	only	-	Apr	Sun>=1	0:01	1:00	D
-Rule	StJohns	1987	max	-	Oct	lastSun	0:01	0	S
+Rule	StJohns	1987	2006	-	Oct	lastSun	0:01	0	S
 Rule	StJohns	1988	only	-	Apr	Sun>=1	0:01	2:00	DD
-Rule	StJohns	1989	max	-	Apr	Sun>=1	0:01	1:00	D
+Rule	StJohns	1989	2006	-	Apr	Sun>=1	0:01	1:00	D
+# From Chris Walton (2006-04-05):
+# http://www.releases.gov.nl.ca/releases/2006/mpa/0331n01.htm
+# [This says Newfoundlandland expects to follow step with the US.]
+Rule	StJohns	2007	max	-	Mar	Sun>=8	0:01	1:00	D
+Rule	StJohns	2007	max	-	Nov	Sun>=1	0:01	0	S
+#
 # St John's has an apostrophe, but Posix file names can't have apostrophes.
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone America/St_Johns	-3:30:52 -	LMT	1884
@@ -1278,6 +1280,30 @@ Zone America/Rainy_River -6:17:56 -	LMT	
 
 # Manitoba
 
+# From Chris Walton (2006-04-05):
+# Here is a copy of the new official time act ...
+# http://web2.gov.mb.ca/laws/statutes/ccsm/o030e.php
+# The act indicates that daylight savings ends at 2:00am.
+
+# From Rob Douglas (2006-04-06):
+# the old Manitoba Time Act - as amended by Bill 2, assented to
+# March 27, 1987 ... said ...
+# "between two o'clock Central Standard Time in the morning of
+# the first Sunday of April of each year and two o'clock Central
+# Standard Time in the morning of the last Sunday of October next
+# following, one hour in advance of Central Standard Time."...
+# I believe that the English legislation [of the old time act] had =
+# been assented to (March 22, 1967)....
+# Also, as far as I can tell, there was no order-in-council varying
+# the time of Daylight Saving Time for 2005 and so the provisions of
+# the 1987 version would apply - the changeover was at 2:00 Central
+# Standard Time (i.e. not until 3:00 Central Daylight Time).
+
+# From Paul Eggert (2006-04-10):
+# Shanks & Pottenger say Manitoba switched at 02:00 (not 02:00s)
+# starting 1966.  Since 02:00s is clearly correct for 1967 on, assume
+# it was also 02:00s in 1966.
+
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 Rule	Winn	1916	only	-	Apr	23	0:00	1:00	D
 Rule	Winn	1916	only	-	Sep	17	0:00	0	S
@@ -1300,18 +1326,13 @@ Rule	Winn	1959	only	-	Oct	lastSun	2:00	0
 Rule	Winn	1960	only	-	Sep	lastSun	2:00	0	S
 Rule	Winn	1963	only	-	Apr	lastSun	2:00	1:00	D
 Rule	Winn	1963	only	-	Sep	22	2:00	0	S
-Rule	Winn	1966	1986	-	Apr	lastSun	2:00	1:00	D
-Rule	Winn	1966	1986	-	Oct	lastSun	2:00	0	S
-Rule	Winn	1987	2006	-	Apr	Sun>=1	2:00s	1:00	D
-# From Paul Eggert (2000-10-02):
-# INMS (2000-09-12) says that, since 1988 at least, Manitoba switches from
-# DST at 03:00 local time.  For now, assume it started in 1987.
-Rule	Winn	1987	2006	-	Oct	lastSun	2:00s	0	S
-Rule	Winn	2007	max	-	Mar	Sun>=8	2:00s	1:00	D
-Rule	Winn	2007	max	-	Nov	Sun>=1	2:00s	0	S
+Rule	Winn	1966	1986	-	Apr	lastSun	2:00s	1:00	D
+Rule	Winn	1966	2005	-	Oct	lastSun	2:00s	0	S
+Rule	Winn	1987	2005	-	Apr	Sun>=1	2:00s	1:00	D
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone America/Winnipeg	-6:28:36 -	LMT	1887 Jul 16
-			-6:00	Winn	C%sT
+			-6:00	Winn	C%sT	2006
+			-6:00	Canada	C%sT
 
 
 # Saskatchewan
@@ -1418,12 +1439,10 @@ Rule	Edm	1969	only	-	Apr	lastSun	2:00	1:
 Rule	Edm	1969	only	-	Oct	lastSun	2:00	0	S
 Rule	Edm	1972	1986	-	Apr	lastSun	2:00	1:00	D
 Rule	Edm	1972	2006	-	Oct	lastSun	2:00	0	S
-Rule	Edm	1987	2006	-	Apr	Sun>=1	2:00	1:00	D
-Rule	Edm	2007	max	-	Mar	Sun>=8	2:00	1:00	D
-Rule	Edm	2007	max	-	Nov	Sun>=1	2:00	0	S
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone America/Edmonton	-7:33:52 -	LMT	1906 Sep
-			-7:00	Edm	M%sT
+			-7:00	Edm	M%sT	1987
+			-7:00	Canada	M%sT
 
 
 # British Columbia
@@ -1443,11 +1462,11 @@ Rule	Vanc	1945	only	-	Sep	30	2:00	0	S
 Rule	Vanc	1946	1986	-	Apr	lastSun	2:00	1:00	D
 Rule	Vanc	1946	only	-	Oct	13	2:00	0	S
 Rule	Vanc	1947	1961	-	Sep	lastSun	2:00	0	S
-Rule	Vanc	1962	max	-	Oct	lastSun	2:00	0	S
-Rule	Vanc	1987	max	-	Apr	Sun>=1	2:00	1:00	D
+Rule	Vanc	1962	2006	-	Oct	lastSun	2:00	0	S
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone America/Vancouver	-8:12:28 -	LMT	1884
-			-8:00	Vanc	P%sT
+			-8:00	Vanc	P%sT	1987
+			-8:00	Canada	P%sT
 Zone America/Dawson_Creek -8:00:56 -	LMT	1884
 			-8:00	Canada	P%sT	1947
 			-8:00	Vanc	P%sT	1972 Aug 30 2:00
@@ -1586,8 +1605,8 @@ Rule	NT_YK	1945	only	-	Sep	30	2:00	0	S
 Rule	NT_YK	1965	only	-	Apr	lastSun	0:00	2:00	DD
 Rule	NT_YK	1965	only	-	Oct	lastSun	2:00	0	S
 Rule	NT_YK	1980	1986	-	Apr	lastSun	2:00	1:00	D
-Rule	NT_YK	1980	max	-	Oct	lastSun	2:00	0	S
-Rule	NT_YK	1987	max	-	Apr	Sun>=1	2:00	1:00	D
+Rule	NT_YK	1980	2006	-	Oct	lastSun	2:00	0	S
+Rule	NT_YK	1987	2006	-	Apr	Sun>=1	2:00	1:00	D
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone America/Pangnirtung -4:22:56 -	LMT	1884
 			-4:00	NT_YK	A%sT	1995 Apr Sun>=1 2:00
@@ -1612,16 +1631,20 @@ Zone America/Cambridge_Bay -7:00:20 -	LM
 			-6:00	-	CST	2001 Apr  1 3:00
 			-7:00	Canada	M%sT
 Zone America/Yellowknife -7:37:24 -	LMT	1884
-			-7:00	NT_YK	M%sT
+			-7:00	NT_YK	M%sT	1980
+			-7:00	Canada	M%sT
 Zone America/Inuvik	-8:54:00 -	LMT	1884
 			-8:00	NT_YK	P%sT	1979 Apr lastSun 2:00
-			-7:00	NT_YK	M%sT
+			-7:00	NT_YK	M%sT	1980
+			-7:00	Canada	M%sT
 Zone America/Whitehorse	-9:00:12 -	LMT	1900 Aug 20
 			-9:00	NT_YK	Y%sT	1966 Jul 1 2:00
-			-8:00	NT_YK	P%sT
+			-8:00	NT_YK	P%sT	1980
+			-8:00	Canada	M%sT
 Zone America/Dawson	-9:17:40 -	LMT	1900 Aug 20
 			-9:00	NT_YK	Y%sT	1973 Oct 28 0:00
-			-8:00	NT_YK	P%sT
+			-8:00	NT_YK	P%sT	1980
+			-9:00	Canada	P%sT
 
 
 ###############################################################################
@@ -2105,6 +2128,18 @@ Zone America/Guatemala	-6:02:04 -	LMT	19
 #   October 2005.
 #
 #  "Port-au-Prince, March 31, 2005"
+#
+# From Steffen Thorsen (2006-04-04):
+# I have been informed by users that Haiti observes DST this year like
+# last year, so the current "only" rule for 2005 might be changed to a
+# "max" rule or to last until 2006. (Who knows if they will observe DST
+# next year or if they will extend their DST like US/Canada next year).
+#
+# I have found this article about it (in French):
+# http://www.haitipressnetwork.com/news.cfm?articleID=7612
+#
+# The reason seems to be an energy crisis.
+
 
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 Rule	Haiti	1983	only	-	May	8	0:00	1:00	D
@@ -2114,8 +2149,8 @@ Rule	Haiti	1983	1987	-	Oct	lastSun	0:00	
 # Go with IATA.
 Rule	Haiti	1988	1997	-	Apr	Sun>=1	1:00s	1:00	D
 Rule	Haiti	1988	1997	-	Oct	lastSun	1:00s	0	S
-Rule	Haiti	2005	only	-	Apr	Sun>=1	0:00	1:00	D
-Rule	Haiti	2005	only	-	Oct	lastSun	0:00	0	S
+Rule	Haiti	2005	max	-	Apr	Sun>=1	0:00	1:00	D
+Rule	Haiti	2005	max	-	Oct	lastSun	0:00	0	S
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone America/Port-au-Prince -4:49:20 -	LMT	1890
 			-4:49	-	PPMT	1917 Jan 24 12:00 # P-a-P MT



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