proposed zoneinfo changes for Canada, Britain, Ireland
Paul Eggert
eggert at twinsun.com
Thu Jun 13 05:50:31 UTC 1996
Here are proposed changes to the tz database, taken from the following:
* I went through Shanks to find all unique timezone histories in Canada
since 1970; one (America/Dawson_Creek) is unique in Canada even today.
* An anonymous tz contributor showed that `IST' is the correct name for
summer time in Dublin.
* While proofreading the above correction I found some other bugs for
Britain and Ireland in 1968 and 1971, which Peter Ilieve kindly verified.
* New comments about the noted DST innovator Benjamin Franklin;
about a couple of time zone mysteries associated with Watson Lake, Yukon,
and Liverpool, Nova Scotia; and about a few other subjects.
Comments (particularly from Canadian readers) are welcome.
Here is a more detailed log of the proposed changes:
europe data:
In Dublin use `IST' instead of `BST' (since 1921-12-06).
London's 1971-10-31 transition was at 03:00, not 02:00.
Set isdst=1 in Belfast, Dublin, and London from 1968-02-18 to 1968-10-27.
northamerica data:
Create the zone America/Dawson_Creek, which observes MST all year.
Northwest Territories and Yukon did not observe DST from 1966 through 1979,
so create zones for Inuvik, Iqaluit, Pangnirtung, Rankin_Inlet, Yellowknife.
Create the zones America/Nipigon and America/Rainy_River
for EST and CST locales that did not observe DST in 1970-1973.
Create the zone America/Thunder_Bay, which skipped DST in 1973.
Create the zone America/Dawson, which switched from YST to PST in 1973.
Create the zone America/Swift_Current for west Saskatechewan towns
that switched from MST/MDT to CST in 1972.
Create zone America/Glace_Bay for AST locales that did not use DST in 1970-1971.
Regina observed CST (not MDT) between 1960 and 1966.
Whitehorse's 1966-07-01 transition was at 02:00 (not 00:00).
Northwest Territories and Yukon observed double DST in 1965.
In 1959, Regina switched from MDT to MST on 10-25, not 09-27.
Whitehorse switched from YDT to YST on 1945-09-30 (this transition was missing).
comments:
Add comments about noted DST innovators B Franklin and W Willett,
plus an acerbic quote about DST by R Davies.
Remove old vague or misleading comments about Canadian rules.
Move comments about Canadian provinces closer to the tables that they describe,
and add a header for each major table.
Touch up comments about Italy.
Add a source for this year's changes to Mexico's rules.
Here is the proposed patch:
===================================================================
RCS file: RCS/europe,v
retrieving revision 1996.8
retrieving revision 1996.8.1.1
diff -c -r1996.8 -r1996.8.1.1
*** europe 1996/05/09 21:40:46 1996.8
--- europe 1996/06/13 05:39:38 1996.8.1.1
***************
*** 125,130 ****
--- 125,139 ----
# transition date for London, namely 1847 Sep 22. We don't know as much
# about Dublin, so we use 1880 Aug 2, the legal transition time.
+ # From Paul Eggert (1996-06-12):
+ # Summer Time was first seriously proposed by William Willett (1857-1915),
+ # a London builder who circulated a pamphlet ``Waste of Daylight'' (1907)
+ # that proposed advancing clocks 20 minutes on each of four Sundays in April,
+ # and retarding them by the same amount on four Sundays in September.
+ # A bill was drafted in 1909 and introduced in Parliament several times,
+ # but it met with ridicule and opposition, especially from farming interests.
+ # One-hour Summer Time was eventually adopted as a wartime measure in 1916.
+
# From Arthur David Olson (January 19, 1989):
#
# A source at the British Information Office in New York avers that it's
***************
*** 418,423 ****
--- 427,448 ----
# who provided the wartime regulations and a snippet of Hansard explaining
# why double summer time started on a Monday in 1945 (it was Easter).
+ # From Peter Ilieve <peter at aldie.co.uk> (1996-05-29):
+ # I have now got a copy of the British Standard Time Act 1968.
+ # It says (S4(2)) that it expires at 02:00 GMT on 31 October 1971 unless
+ # an Order in Council was passed in Parliament to make the Act permanent.
+ # No Order was passed, so 02:00 1971-10-31 it is...
+ #
+ # Interestingly, it says baldly `This Act shall come into force on
+ # 27 October 1968', without giving a time. As S1 of the Act merely
+ # stated that `The time for general purposes in the United Kingdom
+ # (to be known as British standard time) shall be one hour in
+ # advance of Greenwich mean time throughout the year; ...' you could
+ # possibly argue that the start time of BStandardT was 00:00 1968-10-27,
+ # especially as the Act repealed the Summer Time Acts 1916--1947 in toto,
+ # thereby destroying the authority of the Summer Time Order specifying
+ # summer time in 1968....
+
# From Peter Ilieve <peter at memex.co.uk> (November 18, 1993)
#
# Here is a revised version of my tabrules file for the perl script I sent
***************
*** 617,623 ****
# To maintain strict historical accuracy you could start a new UK ending rule
# of Oct Sun>=22 in 1990.
! # From Paul Eggert <eggert at twinsun.com> (November 18, 1993):
#
# As Ilieve remarks, the date `20 April 1924' in the table of ``Summer Time: A
# Consultation Document'' (Cm 722, 1989) table is a transcription error;
--- 642,648 ----
# To maintain strict historical accuracy you could start a new UK ending rule
# of Oct Sun>=22 in 1990.
! # From Paul Eggert <eggert at twinsun.com> (1996-06-12):
#
# As Ilieve remarks, the date `20 April 1924' in the table of ``Summer Time: A
# Consultation Document'' (Cm 722, 1989) table is a transcription error;
***************
*** 637,651 ****
# It actually just had one transition.
# * Northern Ireland used single daylight savings time throughout WW II.
# Actually, it conformed to Britain.
#
! # The following claim by Shanks is possible though doubtful;
! # we'll ignore it for now.
# * Jersey, Guernsey, and the Isle of Man did not switch from GMT
# to daylight savings time until 1921 Apr 3, when they began to
# conform with Great Britain.
#
# Whitman says Dublin Mean Time was -0:25:21, which is more precise than Shanks.
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
# 1916 to 1925--irregular
Rule GB-Eire 1916 only - May 21 2:00s 1:00 BST
--- 662,689 ----
# It actually just had one transition.
# * Northern Ireland used single daylight savings time throughout WW II.
# Actually, it conformed to Britain.
+ # * GB-Eire changed standard time to 1 hour ahead of GMT on 1968-02-18.
+ # Actually, that date saw the usual switch to summer time.
+ # Standard time was not changed until 1968-10-27 (the clocks didn't change).
#
! # The following claims by Shanks are possible though doubtful;
! # we'll ignore them for now.
# * Jersey, Guernsey, and the Isle of Man did not switch from GMT
# to daylight savings time until 1921 Apr 3, when they began to
# conform with Great Britain.
+ # * Dublin's 1971-10-31 switch was at 02:00, even though London's was 03:00.
+ #
#
# Whitman says Dublin Mean Time was -0:25:21, which is more precise than Shanks.
+ # From an anonymous contributor (1996-06-02):
+ # The law governing time in Ireland is under Statutory Instrument SI 395/94,
+ # which gives force to European Union 7th Council Directive # 94/21/EC.
+ # Under this directive, the Minister for Justice in Ireland makes appropriate
+ # regulations. I spoke this morning with the Secretary of the Department of
+ # Justice (tel +353 1 678 9711) who confirmed to me that the correct name is
+ # "Irish Summer Time", abbreviated to "IST".
+
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
# 1916 to 1925--irregular
Rule GB-Eire 1916 only - May 21 2:00s 1:00 BST
***************
*** 710,720 ****
Rule GB-Eire 1960 only - Apr 10 2:00s 1:00 BST
Rule GB-Eire 1961 1963 - Mar lastSun 2:00s 1:00 BST
Rule GB-Eire 1964 1967 - Mar Sun>=19 2:00s 1:00 BST
Rule GB-Eire 1972 1980 - Mar Sun>=16 2:00s 1:00 BST
# 1953 to 1980, ending rules
Rule GB-Eire 1953 1960 - Oct Sun>=1 2:00s 0 GMT
! Rule GB-Eire 1961 1967 - Oct Sun>=23 2:00s 0 GMT
! Rule GB-Eire 1971 only - Oct 31 3:00 0 GMT
Rule GB-Eire 1972 1980 - Oct Sun>=23 2:00s 0 GMT
# 1981 on
Rule GB-Eire 1981 1995 - Mar lastSun 1:00u 1:00 BST
--- 748,758 ----
Rule GB-Eire 1960 only - Apr 10 2:00s 1:00 BST
Rule GB-Eire 1961 1963 - Mar lastSun 2:00s 1:00 BST
Rule GB-Eire 1964 1967 - Mar Sun>=19 2:00s 1:00 BST
+ Rule GB-Eire 1968 only - Feb 18 2:00s 1:00 BST
Rule GB-Eire 1972 1980 - Mar Sun>=16 2:00s 1:00 BST
# 1953 to 1980, ending rules
Rule GB-Eire 1953 1960 - Oct Sun>=1 2:00s 0 GMT
! Rule GB-Eire 1961 1968 - Oct Sun>=23 2:00s 0 GMT
Rule GB-Eire 1972 1980 - Oct Sun>=23 2:00s 0 GMT
# 1981 on
Rule GB-Eire 1981 1995 - Mar lastSun 1:00u 1:00 BST
***************
*** 724,752 ****
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Europe/London -0:01:15 - LMT 1847 Sep 22
! 0:00 GB-Eire %s 1968 Feb 18 2:00
! 1:00 - BST 1971 Oct 31 2:00
0:00 GB-Eire %s 1996
0:00 EU GMT/BST
Zone Europe/Belfast -0:23:40 - LMT 1880 Aug 2
-0:25:21 - DMT 1916 May 21 2:00 # Dublin MT
-0:25:21 1:00 DST 1916 Oct 1 3:00
! 0:00 GB-Eire %s 1968 Feb 18 2:00
! 1:00 - BST 1971 Oct 31 3:00
0:00 GB-Eire %s 1996
0:00 EU GMT/BST
Zone Europe/Dublin -0:25:21 - LMT 1880 Aug 2
-0:25:21 - DMT 1916 May 21 2:00 # Dublin MT
-0:25:21 1:00 DST 1916 Oct 1 3:00
! 0:00 GB-Eire %s 1940 Feb 25 2:00
! 0:00 1:00 BST 1946 Oct 6 2:00
0:00 - GMT 1947 Mar 16 2:00
! 0:00 1:00 BST 1947 Nov 2 2:00
0:00 - GMT 1948 Apr 18 2:00
! 0:00 GB-Eire %s 1968 Feb 18 2:00
! 1:00 - BST 1971 Oct 31 3:00
! 0:00 GB-Eire %s 1996
! 0:00 EU GMT/BST
###############################################################################
--- 762,791 ----
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone Europe/London -0:01:15 - LMT 1847 Sep 22
! 0:00 GB-Eire %s 1968 Oct 27
! 1:00 - BST 1971 Oct 31 2:00u
0:00 GB-Eire %s 1996
0:00 EU GMT/BST
Zone Europe/Belfast -0:23:40 - LMT 1880 Aug 2
-0:25:21 - DMT 1916 May 21 2:00 # Dublin MT
-0:25:21 1:00 DST 1916 Oct 1 3:00
! 0:00 GB-Eire %s 1968 Oct 27
! 1:00 - BST 1971 Oct 31 2:00u
0:00 GB-Eire %s 1996
0:00 EU GMT/BST
Zone Europe/Dublin -0:25:21 - LMT 1880 Aug 2
-0:25:21 - DMT 1916 May 21 2:00 # Dublin MT
-0:25:21 1:00 DST 1916 Oct 1 3:00
! 0:00 GB-Eire %s 1921 Dec 6
! 0:00 GB-Eire GMT/IST 1940 Feb 25 2:00
! 0:00 1:00 IST 1946 Oct 6 2:00
0:00 - GMT 1947 Mar 16 2:00
! 0:00 1:00 IST 1947 Nov 2 2:00
0:00 - GMT 1948 Apr 18 2:00
! 0:00 GB-Eire GMT/IST 1968 Oct 27
! 1:00 - IST 1971 Oct 31 2:00u
! 0:00 GB-Eire GMT/IST 1996
! 0:00 EU GMT/IST
###############################################################################
***************
*** 1294,1304 ****
# Italy
# From Paul Eggert (1996-05-06):
# For Italian DST we have three sources: Shanks, Whitman, and F. Pollastri
! # <http://pisolo.cstv.to.cnr.it/toi/it/ienitlt.html> (see `FP' below),
# taken from a publication of the Italian National Electrotechnical Institute.
# When the three sources disagree, guess who's right, as follows:
#
! # year FP Shanks (S) Whitman (W) Go with:
# 1916 06-03 06-03 24:00 06-03 00:00 FP & W
# 09-30 09-30 24:00 09-30 01:00 FP; guess 24:00s
# 1917 04-01 03-31 24:00 03-31 00:00 FP & S
--- 1333,1343 ----
# Italy
# From Paul Eggert (1996-05-06):
# For Italian DST we have three sources: Shanks, Whitman, and F. Pollastri
! # <URL:http://pisolo.cstv.to.cnr.it/toi/uk/ienitlt.html> (see `FP' below),
# taken from a publication of the Italian National Electrotechnical Institute.
# When the three sources disagree, guess who's right, as follows:
#
! # year FP Shanks (S) Whitman (W) Go with:
# 1916 06-03 06-03 24:00 06-03 00:00 FP & W
# 09-30 09-30 24:00 09-30 01:00 FP; guess 24:00s
# 1917 04-01 03-31 24:00 03-31 00:00 FP & S
===================================================================
RCS file: RCS/northamerica,v
retrieving revision 1996.7
retrieving revision 1996.7.1.1
diff -c -r1996.7 -r1996.7.1.1
*** northamerica 1996/05/03 02:49:59 1996.7
--- northamerica 1996/06/13 05:39:38 1996.7.1.1
***************
*** 21,26 ****
--- 21,44 ----
# Make sure you have the errata sheet; the book is somewhat useless without it.
# It is the source for the US and Puerto Rico entries below.
+ # From Paul Eggert (1996-06-12):
+ # Daylight Saving Time was first suggested as a joke by Benjamin Franklin
+ # in his whimsical essay ``Turkey vs Eagle, McCauley is my Beagle'' (1784).
+ # Not everyone is happy with the results:
+ #
+ # I don't really care how time is reckoned so long as there is some
+ # agreement about it, but I object to being told that I am saving
+ # daylight when my reason tells me that I am doing nothing of the kind.
+ # I even object to the implication that I am wasting something
+ # valuable if I stay in bed after the sun has risen. As an admirer
+ # of moonlight I resent the bossy insistence of those who want to
+ # reduce my time for enjoying it. At the back of the Daylight Saving
+ # scheme I detect the bony, blue-fingered hand of Puritanism, eager
+ # to push people into bed earlier, and get them up earlier, to make
+ # them healthy, wealthy and wise in spite of themselves.
+ #
+ # -- Robertson Davies, The Diary of Samuel Marchbanks (1947), XIX, Sunday
+
# From Arthur David Olson:
# US Daylight Saving Time ended on the last Sunday of *October* in 1974.
# See, for example, the front page of the Saturday, October 26, 1974
***************
*** 463,540 ****
# Canada
- # Canada is reportedly lots easier than the US--leastways since 1951.
- # I don't know what they did before then.
- # 4.3BSD claims that it's perfectly regular.
- # According to a posting in "comp.bugs.misc", "comp.unix.wizards", etc.
- # on February 8, 1987, by Dave Sherman of the Law Society of Upper Canada,
- # "...Canada (well, Ontario and at least some of the other provinces) are
- # adopting the new daylight savings time rules...". We assume all of
- # Canada is doing so.
-
- # From Bob Devine (January 28, 1988):
- # All of Canada did have DST from your first rule except Saskatchewan.
- # Which parts did not observe DST is hard to pinpoint but most of the
- # province follows the rules.
- # NOTE: those that didn't have DST for that rule, also
- # probably did not have it for several years previous.
-
- # From U. S. Naval Observatory (January 19, 1989):
- # CANADA NEW FDL 3.5H BEHIND UTC ST.JOHN'S
- # CANADA NEW FDL 1.5H BEHIND UTC APR 3 - OCT 29
- # CANADA ATLANTIC 4 H BEHIND UTC HALIFAX
- # CANADA ATLANTIC 3 H BEHIND UTC APR 3 - OCT 29
- # CANADA EASTERN 5 H BEHIND UTC TORONTO, MONTREAL, OTTAWA
- # CANADA EASTERN 4 H BEHIND UTC APR 3 - OCT 29
- # CANADA CENTRAL 6 H BEHIND UTC REGINA, WINNIPEG
- # CANADA CENTRAL 5 H BEHIND UTC APR 3 - OCT 29
- # CANADA MOUNTAIN 7 H BEHIND UTC CALGARY, EDMONTON
- # CANADA MOUNTAIN 6 H BEHIND UTC APR 3 - OCT 29
- # CANADA PACIFIC 8 H BEHIND UTC VANCOUVER
- # CANADA PACIFIC 7 H BEHIND UTC APR 3 - OCT 29
- # CANADA YUKON SAME AS PACIFIC DAWSON
-
- # From Arthur David Olson (January 21, 1989):
- # April 3 fell on a Sunday in 1988; October 29 fell on a Sunday in 1989. Ahem.
- # Note claim that there's double DST in Newfoundland and that Yukon should
- # be same as Pacific.
-
- # From W. Jones (jones at skdad.usask.ca) (November 6, 1992):
- # The. . .below is based on information I got from our law library, the
- # provincial archives, and the provincial Community Services department.
- # A precise history would require digging through newspaper archives, and
- # since you didn't say what you wanted, I didn't bother.
- #
- # Saskatchewan is split by a time zone meridian (105W) and over the years
- # the boundary became pretty ragged as communities near it reevaluated
- # their affiliations in one direction or the other. In 1965 a provincial
- # referendum favoured legislating common time practices.
- #
- # On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
- # Saskatchewan 1978) was proclaimed, and established that the eastern
- # part of Saskatchewan would use CST year round, that districts in
- # northwest Saskatchewan would by default follow CST but could opt to
- # follow Mountain Time rules (thus 1 hour difference in the winter and
- # zero in the summer), and that districts in southwest Saskatchewan would
- # by default follow MT but could opt to follow CST.
- #
- # It took a few years for the dust to settle (I know one story of a town
- # on one time zone having its school in another, such that a mom had to
- # serve her family lunch in two shifts), but presently it seems that only
- # a few towns on the border with Alberta (e.g. Lloydminster) follow MT
- # rules any more; all other districts appear to have used CST year round
- # since sometime in the 1960s.
- #
- # Here's how I would summarize things. Establish a "Saskatchewan" CST
- # time zone, and note that it officially exists as of 15 April 1966. Any
- # current exceptions can put themselves in the "Mountain" zone, since
- # those are the rules they follow. Any past exceptions can be forgotten,
- # since that's what those who live here have done.
-
- # From Arthur David Olson (November 21, 1992):
- # East-Saskatchewan kept to avoid problems for folks using that zone by name;
- # plain Saskatchewan added.
-
# From Alain LaBont<e'> <ALB at immedia.ca> (1994-11-14):
# I post here the time zone abbreviations standardized in Canada
# for both English and French in the CAN/CSA-Z234.4-89 standard....
--- 481,486 ----
***************
*** 567,573 ****
# From Paul Eggert <eggert at twinsun.com> (1994-11-22):
# Alas, this sort of thing must be handled by localization software.
! # From Shanks (1991):
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D
Rule StJohns 1917 only - Sep 17 2:00 0 S
--- 513,533 ----
# From Paul Eggert <eggert at twinsun.com> (1994-11-22):
# Alas, this sort of thing must be handled by localization software.
! # The data for Canada are all from Shanks (1991).
!
!
! # Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
! Rule Canada 1918 only - Apr 14 2:00 1:00 D
! Rule Canada 1918 only - Oct 31 2:00 0 S
! Rule Canada 1942 only - Feb 9 2:00 1:00 D
! 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
!
!
! # Newfoundland
!
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule StJohns 1917 1918 - Apr Sun>=8 2:00 1:00 D
Rule StJohns 1917 only - Sep 17 2:00 0 S
***************
*** 606,611 ****
--- 566,581 ----
-3:31 StJohns N%sT 1935 Mar 30
-3:30 StJohns N%sT
+
+ # Labrador, New Brunswick, Nova Scotia, Prince Edward I
+
+ # From Paul Eggert (1996-06-12):
+ # Shanks writes that since 1970 most of this region has been like Halifax.
+ # Many locales did not observe peacetime DST until 1972;
+ # Glace Bay, NS is the largest that we know of.
+ # Shanks also writes that Liverpool, NS was the only town in Canada to observe
+ # DST in 1971 but not 1970; for now we'll assume this is a typo.
+
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Halifax 1916 only - Apr 1 0:00 1:00 D
Rule Halifax 1916 only - Oct 1 0:00 0 S
***************
*** 650,655 ****
--- 620,640 ----
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Halifax -4:14:24 - LMT 1902 Jun 15
-4:00 Halifax A%sT
+ Zone America/Glace_Bay -3:59:48 - LMT 1902 Jun 15
+ -4:00 Canada A%sT 1953
+ -4:00 Halifax A%sT 1954
+ -4:00 - AST 1972
+ -4:00 Halifax A%sT
+
+
+ # Ontario, Quebec
+
+ # From Paul Eggert (1996-06-12):
+ # Shanks writes that since 1970 most of this region has been like Montreal.
+ # Thunder Bay skipped DST in 1973.
+ # Many smaller locales did not observe peacetime DST until 1974;
+ # Nipigon (EST) and Rainy River (CST) are the largest that we know of.
+ # Far west Ontario is like Winnipeg; far east Quebec is like Halifax.
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Mont 1917 only - Mar 25 2:00 1:00 D
***************
*** 683,688 ****
--- 668,685 ----
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Montreal -4:54:16 - LMT 1884
-5:00 Mont E%sT
+ Zone America/Thunder_Bay -5:57:00 - LMT 1895
+ -5:00 Canada E%sT 1970
+ -5:00 Mont E%sT 1973
+ -5:00 - EST 1974
+ -5:00 Canada E%sT
+ Zone America/Nipigon -5:53:04 - LMT 1895
+ -5:00 Canada E%sT
+ Zone America/Rainy_River -6:17:56 - LMT 1895
+ -6:00 Canada C%sT
+
+
+ # Manitoba
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Winn 1916 only - Apr 23 0:00 1:00 D
***************
*** 712,717 ****
--- 709,748 ----
Zone America/Winnipeg -6:28:36 - LMT 1887 Jul 16
-6:00 Winn C%sT
+
+ # Saskatchewan
+
+ # From Paul Eggert (1996-06-12):
+ # Shanks writes that since 1970 most of this region has been like Regina.
+ # Some western towns (e.g. Swift Current) switched from MST/MDT to CST in 1972.
+ # Other western towns (e.g. Lloydminster) are like Edmonton.
+
+ # From W. Jones <jones at skdad.usask.ca> (November 6, 1992):
+ # The. . .below is based on information I got from our law library, the
+ # provincial archives, and the provincial Community Services department.
+ # A precise history would require digging through newspaper archives, and
+ # since you didn't say what you wanted, I didn't bother.
+ #
+ # Saskatchewan is split by a time zone meridian (105W) and over the years
+ # the boundary became pretty ragged as communities near it reevaluated
+ # their affiliations in one direction or the other. In 1965 a provincial
+ # referendum favoured legislating common time practices.
+ #
+ # On 15 April 1966 the Time Act (c. T-14, Revised Statutes of
+ # Saskatchewan 1978) was proclaimed, and established that the eastern
+ # part of Saskatchewan would use CST year round, that districts in
+ # northwest Saskatchewan would by default follow CST but could opt to
+ # follow Mountain Time rules (thus 1 hour difference in the winter and
+ # zero in the summer), and that districts in southwest Saskatchewan would
+ # by default follow MT but could opt to follow CST.
+ #
+ # It took a few years for the dust to settle (I know one story of a town
+ # on one time zone having its school in another, such that a mom had to
+ # serve her family lunch in two shifts), but presently it seems that only
+ # a few towns on the border with Alberta (e.g. Lloydminster) follow MT
+ # rules any more; all other districts appear to have used CST year round
+ # since sometime in the 1960s.
+
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Regina 1918 only - Apr 14 2:00 1:00 D
Rule Regina 1918 only - Oct 31 2:00 0 S
***************
*** 723,737 ****
Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
Rule Regina 1942 only - Feb 9 2:00 1:00 D
Rule Regina 1945 only - Sep lastSun 2:00 0 S
! Rule Regina 1946 only - Apr 14 2:00 1:00 D
! Rule Regina 1946 only - Oct 13 2:00 0 S
! Rule Regina 1947 1960 - Apr lastSun 2:00 1:00 D
! Rule Regina 1947 1959 - Sep lastSun 2:00 0 S
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
! Zone America/Regina -6:58:36 - LMT 1905 Sep
! -7:00 Regina M%sT 1966 Apr 15
-6:00 - CST
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
Rule Edm 1918 only - Oct 31 2:00 0 S
--- 754,783 ----
Rule Regina 1939 1941 - Oct Sun>=8 0:00 0 S
Rule Regina 1942 only - Feb 9 2:00 1:00 D
Rule Regina 1945 only - Sep lastSun 2:00 0 S
! Rule Regina 1946 only - Apr Sun>=8 2:00 1:00 D
! Rule Regina 1946 only - Oct Sun>=8 2:00 0 S
! Rule Regina 1947 1959 - Apr lastSun 2:00 1:00 D
! Rule Regina 1947 1958 - Sep lastSun 2:00 0 S
! Rule Regina 1959 only - Oct lastSun 2:00 0 S
! #
! Rule Swift 1957 only - Apr lastSun 2:00 1:00 D
! Rule Swift 1957 only - Oct lastSun 2:00 0 S
! Rule Swift 1959 1961 - Apr lastSun 2:00 1:00 D
! Rule Swift 1959 only - Oct lastSun 2:00 0 S
! Rule Swift 1960 1961 - Sep lastSun 2:00 0 S
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
! Zone America/Regina -6:58:36 - LMT 1905 Sep
! -7:00 Regina M%sT 1960 Apr lastSun 2:00
! -6:00 - CST
! Zone America/Swift_Current -7:11:20 - LMT 1905 Sep
! -7:00 Canada M%sT 1946 Apr lastSun 2:00
! -7:00 Regina M%sT 1950
! -7:00 Swift M%sT 1972 Apr lastSun 2:00
-6:00 - CST
+
+ # Alberta
+
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Edm 1918 1919 - Apr Sun>=8 2:00 1:00 D
Rule Edm 1918 only - Oct 31 2:00 0 S
***************
*** 754,759 ****
--- 800,812 ----
Zone America/Edmonton -7:33:52 - LMT 1906 Sep
-7:00 Edm M%sT
+
+ # British Columbia
+
+ # From Paul Eggert (1996-06-12):
+ # Shanks writes that since 1970 most of this region has been like Vancouver.
+ # Dawswon Creek uses MST. Much of east BC is like Edmonton.
+
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
Rule Vanc 1918 only - Apr 14 2:00 1:00 D
Rule Vanc 1918 only - Oct 31 2:00 0 S
***************
*** 767,789 ****
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Vancouver -8:12:28 - LMT 1884
-8:00 Vanc P%sT
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
! Rule Yukon 1918 only - Apr 14 2:00 1:00 D
! Rule Yukon 1918 only - Oct 27 2:00 0 S
! Rule Yukon 1919 only - May 25 2:00 1:00 D
! Rule Yukon 1919 only - Nov 1 0:00 0 S
! Rule Yukon 1942 only - Feb 9 2:00 1:00 D
! Rule Yukon 1965 only - Apr 25 0:00 1:00 D
! Rule Yukon 1965 only - Oct 31 2:00 0 S
! Rule Yukon 1980 1986 - Apr lastSun 2:00 1:00 D
! Rule Yukon 1980 max - Oct lastSun 2:00 0 S
! Rule Yukon 1987 max - Apr Sun>=1 2:00 1:00 D
! # Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Whitehorse -9:00:12 - LMT 1900 Aug 20
! -9:00 Yukon Y%sT 1966 Jul
! -8:00 Yukon P%sT
! # Parts of Yukon (e.g. Dawson) didn't switch to -8:00 until 1973 Oct 28.
###############################################################################
--- 820,869 ----
# Zone NAME GMTOFF RULES FORMAT [UNTIL]
Zone America/Vancouver -8:12:28 - LMT 1884
-8:00 Vanc 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
+ -7:00 - MST
+
+
+ # Northwest Territories, Yukon
+
+ # From Paul Eggert (1996-06-12):
+ # Dawson switched to PST in 1973. Inuvik switched to MST in 1979.
+ # Shanks's table for Watson Lake is corrupted, so we have no data there.
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
! Rule NT_YK 1918 only - Apr 14 2:00 1:00 D
! Rule NT_YK 1918 only - Oct 27 2:00 0 S
! Rule NT_YK 1919 only - May 25 2:00 1:00 D
! Rule NT_YK 1919 only - Nov 1 0:00 0 S
! Rule NT_YK 1942 only - Feb 9 2:00 1:00 D
! Rule NT_YK 1945 only - Sep 30 2:00 0 S
! # 0:00 ??
! 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
! # Zone NAME GMTOFF RULES FORMAT [UNTIL]
! Zone America/Pangnirtung -4:22:56 - LMT 1884
! -4:00 NT_YK A%sT
! Zone America/Iqaluit -4:33:52 - LMT 1884 # Frobisher Bay
! -5:00 NT_YK E%sT
! Zone America/Rankin_Inlet -6:08:40 - LMT 1884
! -6:00 NT_YK C%sT
! Zone America/Yellowknife -7:37:24 - LMT 1884
! -7:00 NT_YK 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
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
! Zone America/Dawson -9:17:40 - LMT 1900 Aug 20
! -9:00 NT_YK Y%sT 1973 Oct lastSun 2:00
! -8:00 NT_YK P%sT
!
###############################################################################
***************
*** 868,873 ****
--- 948,957 ----
# The Decree was published in Mexico's Official Newspaper on January 4th.
#
# -------------- End Forwarded Message --------------
+ # From Paul Eggert (1996-06-12):
+ # For an English translation of the decree,
+ # see ``Diario Oficial: Time Zone Changeover'',
+ # <URL:http://mexico-travel.com/extra/timezone_eng.html> (1996-01-04).
# From Shanks (1991):
# Rule NAME FROM TO TYPE IN ON AT SAVE LETTER/S
More information about the tz
mailing list