Proposed change to time zone northamerica file: deferred Cuban DST
Since this affects current time stamps, it's probably best to get a best guess out the door rather than wait for documentation. Here's a proposed change to the time zone package "northamerica" file to reflect the deferred start of DST in Cuba. --ado ------- northamerica ------- *** /tmp/geta1868 Mon Mar 10 15:35:07 2008 --- /tmp/getb1868 Mon Mar 10 15:35:07 2008 *************** *** 1,4 **** ! # @(#)northamerica 8.20 # <pre> # also includes Central America and the Caribbean --- 1,4 ---- ! # @(#)northamerica 8.21 # <pre> # also includes Central America and the Caribbean *************** *** 2205,2210 **** --- 2205,2229 ---- # # 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 Arthur David Olson (2008-03-10): + # The above matches what's found at the unofficial site + # <a href="http://www.timeanddate.com/worldclock/results.html?query=havana"> + # http://www.timeanddate.com/worldclock/results.html?query=havana + # </a>. Assume lastSun from 2008 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 --- 2255,2262 ---- 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 lastSun 0:00s 1:00 D # Zone NAME GMTOFF RULES FORMAT [UNTIL] Zone America/Havana -5:29:28 - LMT 1890
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): http://www.nnc.cubaweb.cu/marzo-2008/cien-1-11-3-08.htm Some more background information is posted here: http://www.timeanddate.com/news/time/cuba-starts-dst-march-16.html 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: http://www.radiohc.cu/espanol/noticias/mar07/11mar/hor.htm
Al finalizar el conflicto bélico se eliminó de nuevo esa costumbre y fue retomada en 1963. Desde entonces, empezó a aplicarse regularmente todos los años, salvo en 1970.
Best regards, Steffen Thorsen - http://www.timeanddate.com Arthur David Olson wrote:
Since this affects current time stamps, it's probably best to get a best guess out the door rather than wait for documentation. Here's a proposed change to the time zone package "northamerica" file to reflect the deferred start of DST in Cuba.
participants (2)
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Arthur David Olson -
Steffen Thorsen