When should Canada/Central return to Standard Time?

[Paul Eggert]

I consulted Shanks and found that I transcribed his data for Winnipeg
incorrectly, not only for this year, but also for 1937, 1948, 1950,
1963, and all years from 1966 on.  Sorry about that -- I must have
forgotten to proofread Winnipeg originally.  (At least I didn't
misspell its name as ``Winnepeg''....)

Given Shanks's data, I'd guess that the Sun customer's ``one week too
early'' was just a approximation, and the true error is one month too
early.  This is consistent with the rest of Canada.  Here is a
proposed patch.

===================================================================
RCS file: RCS/northamerica,v
retrieving revision 1995.8
retrieving revision 1995.8.1.1
diff -c -r1995.8 -r1995.8.1.1
*** northamerica	1995/09/21 15:26:26	1995.8
--- northamerica	1995/09/26 10:36:47	1995.8.1.1
***************
*** 464,484 ****
  Rule	Winn	1918	only	-	Apr	14	2:00	1:00	D
  Rule	Winn	1918	only	-	Oct	31	2:00	0	S
  Rule	Winn	1937	only	-	May	16	2:00	1:00	D
! Rule	Winn	1937	only	-	Sep	23	2:00	0	S
  Rule	Winn	1942	only	-	Feb	 9	2:00	1:00	D
  Rule	Winn	1945	only	-	Sep	lastSun	2:00	0	S
  Rule	Winn	1946	only	-	May	12	2:00	1:00	D
  Rule	Winn	1946	only	-	Oct	13	2:00	0	S
  Rule	Winn	1947	1949	-	Apr	lastSun	2:00	1:00	D
! Rule	Winn	1947	1958	-	Sep	lastSun	2:00	0	S
! Rule	Winn	1948	only	-	May	 1	2:00	1:00	D
! Rule	Winn	1948	1960	-	Apr	lastSun	2:00	1:00	D
  Rule	Winn	1959	only	-	Oct	lastSun	2:00	0	S
  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	lastSun	2:00	0	S
  Rule	Winn	1966	1986	-	Apr	lastSun	2:00	1:00	D
! Rule	Winn	1966	max	-	Sep	lastSun	2:00	0	S
  Rule	Winn	1987	max	-	Apr	Sun>=1	2:00	1:00	D
  # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
  Zone America/Winnipeg	-6:28:36 -	LMT	1887 Jul 16
--- 464,486 ----
  Rule	Winn	1918	only	-	Apr	14	2:00	1:00	D
  Rule	Winn	1918	only	-	Oct	31	2:00	0	S
  Rule	Winn	1937	only	-	May	16	2:00	1:00	D
! Rule	Winn	1937	only	-	Sep	26	2:00	0	S
  Rule	Winn	1942	only	-	Feb	 9	2:00	1:00	D
  Rule	Winn	1945	only	-	Sep	lastSun	2:00	0	S
  Rule	Winn	1946	only	-	May	12	2:00	1:00	D
  Rule	Winn	1946	only	-	Oct	13	2:00	0	S
  Rule	Winn	1947	1949	-	Apr	lastSun	2:00	1:00	D
! Rule	Winn	1947	1949	-	Sep	lastSun	2:00	0	S
! Rule	Winn	1950	only	-	May	 1	2:00	1:00	D
! Rule	Winn	1950	only	-	Sep	30	2:00	0	S
! Rule	Winn	1951	1960	-	Apr	lastSun	2:00	1:00	D
! Rule	Winn	1951	1958	-	Sep	lastSun	2:00	0	S
  Rule	Winn	1959	only	-	Oct	lastSun	2:00	0	S
  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	max	-	Oct	lastSun	2:00	0	S
  Rule	Winn	1987	max	-	Apr	Sun>=1	2:00	1:00	D
  # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
  Zone America/Winnipeg	-6:28:36 -	LMT	1887 Jul 16