Proposed change to time zone northamerica file: deferred Cuban DST

[Arthur David Olson]

With Steffen Thorsen's information in hand, here's a revised patch to the
northamerica file (relative to tzdata2008a.tar.gz). Absent objections or
better information, I'll try to put tzdata2008b.tar.gz in place this coming Saturday morning (to--barely--beat the transition time).

				--ado

------- northamerica -------
*** /tmp/geta11739	Wed Mar 12 10:00:56 2008
--- /tmp/getb11739	Wed Mar 12 10:00:56 2008
***************
*** 1,4 ****
! # @(#)northamerica	8.20
  # <pre>
  
  # also includes Central America and the Caribbean
--- 1,4 ----
! # @(#)northamerica	8.22
  # <pre>
  
  # also includes Central America and the Caribbean
***************
*** 2205,2210 ****
--- 2205,2252 ----
  # 
  # http://www.worldtimezone.com/dst_news/dst_news_cuba03.html
  
+ # From Arthur David Olson (2008-03-09):
+ # I'm in Maryland which is now observing United States Eastern Daylight
+ # Time. At 9:44 local time I used RealPlayer to listen to
+ # <a href="http://media.enet.cu/radioreloj">
+ # http://media.enet.cu/radioreloj
+ # </a>, a Cuban information station, and heard
+ # the time announced as "ocho cuarenta y cuatro" ("eight forty-four"),
+ # indicating that Cuba is still on standard time.
+ 
+ # From Dirk Losch (2008-03-05):
+ # I've been informed that the DST in Cuba will begin at 30th of 
+ # March 2008. The information is based on IATA.
+ 
+ # From Steffen Thorsen (2008-03-12):
+ # It seems that Cuba will start DST on Sunday, 2007-03-16, two weeks
+ # earlier than expected (or one week later than current tzdata).
+ #
+ # It was announced yesterday, according to this source (in Spanish):
+ # <a href="http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm">
+ # http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm
+ # </a>
+ #
+ # Some more background information is posted here:
+ # <a href="http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html">
+ # http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html
+ # </a>
+ #
+ # The article also says that Cuba has been observing DST since 1963,
+ # while Shanks (and tzdata) has 1965 as the first date (except in the
+ # 1940's). Many other web pages in Cuba also claim that it has been
+ # observed since 1963, but with the exception of 1970 - an exception
+ # which is not present in tzdata/Shanks. So there is a chance we need to
+ # change some historic records as well.
+ #
+ # One example:
+ # <a href="http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm">
+ # http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm
+ # </a>
+ 
+ # From Arthur David Olson (2008-03-12):
+ # Assume Sun>=15 (third Sunday) going forward.
+ 
  # Rule	NAME	FROM	TO	TYPE	IN	ON	AT	SAVE	LETTER/S
  Rule	Cuba	1928	only	-	Jun	10	0:00	1:00	D
  Rule	Cuba	1928	only	-	Oct	10	0:00	0	S
***************
*** 2236,2242 ****
  Rule	Cuba	1998	2003	-	Oct	lastSun	0:00s	0	S
  Rule	Cuba	2000	2006	-	Apr	Sun>=1	0:00s	1:00	D
  Rule	Cuba	2006	max	-	Oct	lastSun	0:00s	0	S
! Rule	Cuba	2007	max	-	Mar	Sun>=8	0:00s	1:00	D
  
  # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
  Zone	America/Havana	-5:29:28 -	LMT	1890
--- 2278,2285 ----
  Rule	Cuba	1998	2003	-	Oct	lastSun	0:00s	0	S
  Rule	Cuba	2000	2006	-	Apr	Sun>=1	0:00s	1:00	D
  Rule	Cuba	2006	max	-	Oct	lastSun	0:00s	0	S
! Rule	Cuba	2007	only	-	Mar	Sun>=8	0:00s	1:00	D
! Rule	Cuba	2008	max	-	Mar	Sun>=15	0:00s	1:00	D
  
  # Zone	NAME		GMTOFF	RULES	FORMAT	[UNTIL]
  Zone	America/Havana	-5:29:28 -	LMT	1890