Manitoba, Ontario, P.E.I., Quebec adopt 2007 US DST change

[Paul Eggert]

I looked around for news reports of the effect on the US's 2007
daylight-saving plans on Canada, and found reports that Manitoba,
Ontario, P.E.I., and Quebec are committed to switching, and other
provinces are thinking of switching.

My assumption is that all of Canada (save perhaps Newfoundland) will
switch, but that it's too early to regard this as official.

One problem is how to reflect this in the tz database.  I'm inclined
to propose something along the following lines, at least for now, to
keep the tables simple; we should be able to fix things before 2007 if
some of the provinces decline to follow the US lead.  Please see the
changes in commentary below to see what provinces would be affected.



===================================================================
RCS file: RCS/northamerica,v
retrieving revision 2005.15.1.3
diff -pu -r2005.15.1.3 northamerica
--- northamerica	2005/12/20 15:04:00	2005.15.1.3
+++ northamerica	2005/12/21 21:00:48
@@ -820,18 +820,37 @@ Zone America/Menominee	-5:50:27 -	LMT	18
 
 # Unless otherwise specified, the data for Canada are all from Shanks.
 
-# From Paul Eggert (2000-10-02):
+# From Paul Eggert (2005-12-21):
 # H. David Matthews and Mary Vincent's map
-# <a href="http://www.canadiangeographic.ca/SO98/geomap.htm">
+# <a href="http://www.canadiangeographic.ca/Magazine/SO98/geomap.asp">
 # "It's about TIME", _Canadian Geographic_ (September-October 1998)
 # </a> contains detailed boundaries for regions observing nonstandard
 # time and daylight saving time arrangements in Canada circa 1998.
 #
-# INMS, the Institute for National Measurement Standards in Ottawa, has
-# <a href="http://www.nrc.ca/inms/time/tze.html">
+# INMS, the Institute for National Measurement Standards in Ottawa, has <a
+# href="http://inms-ienm.nrc-cnrc.gc.ca/en/time_services/daylight_saving_e.php">
 # information about standard and daylight saving time zones in Canada.
 # </a> (updated periodically).
 # Its unofficial information is often taken from Matthews and Vincent.
+#
+# CBC News reported that Ontario and Manitoba have announced plans to
+# follow the US change, and that Nova Scotia is considering it; see
+# <http://www.cbc.ca/news/background/daylightsavingtime/> (2005-10-21).
+# CBC news also reported that Prince Edward Island is the first
+# province in Atlantic Canada to follow the US change, and that Quebec
+# had agreed; see <http://www.cbc.ca/pei/story/pe_daylight_20051207.html>
+# (2005-12-07).
+#
+# To reflect all this, the Canada 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, Alberta, 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 Edm, Vanc, StJohns, and NT_YK
+# rules as the corresponding provinces make their announcements.
 
 # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
 Rule	Canada	1918	only	-	Apr	14	2:00	1:00	D
@@ -840,8 +859,10 @@ Rule	Canada	1942	only	-	Feb	 9	2:00	1:00
 Rule	Canada	1945	only	-	Aug	14	23:00u	1:00	P # Peace
 Rule	Canada	1945	only	-	Sep	30	2:00	0	S
 Rule	Canada	1974	1986	-	Apr	lastSun	2:00	1:00	D
-Rule	Canada	1974	max	-	Oct	lastSun	2:00	0	S
-Rule	Canada	1987	max	-	Apr	Sun>=1	2:00	1:00	D
+Rule	Canada	1974	2006	-	Oct	lastSun	2:00	0	S
+Rule	Canada	1987	2006	-	Apr	Sun>=1	2:00	1:00	D
+Rule	Canada	2007	max	-	Mar	Sun>=8	2:00	1:00	D
+Rule	Canada	2007	max	-	Nov	Sun>=1	2:00	0	S
 
 
 # Newfoundland (and far southeast Labrador)
@@ -1167,11 +1188,13 @@ Rule	Winn	1963	only	-	Apr	lastSun	2:00	1
 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	max	-	Apr	Sun>=1	2:00	1:00	D
+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	max	-	Oct	lastSun	2:00s	0	S
+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
 # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
 Zone America/Winnipeg	-6:28:36 -	LMT	1887 Jul 16
 			-6:00	Winn	C%sT