At Sat, 17 Apr 2004 11:30:25 +0900, Ganbold <ganbold@micom.mng.net> writes:
Last time the rule was changed in 2001 only.
Thanks for the clarification. The current tz data for Mongolia in 2001 relies on this comment: # From Rives McDow (2001-05-13): # In addition to Mongolia starting daylight savings as reported earlier # (adopted DST on 2001-04-27 02:00 local time, ending 2001-09-28), This conflicts with the rules that you mentioned, in two ways. First, according to McDow the 2001 daylight-saving began on April 27, which was a Friday, not a Saturday; and daylight-saving ended on the last Friday in September, not the last Saturday. It's possible that McDow's informant got confused about Friday versus Saturday; it wouldn't be the first time that this has happened. But the part about the end of April sounds plausible -- it's quite common for countries to start daylight-saving late their first year. So, unless you disagree, I'm inclined to change the rules to be the following: Rule Mongol 2001 only - Apr lastSat 2:00 1:00 S Rule Mongol 2001 max - Sep lastSat 2:00 0 - Rule Mongol 2002 max - Mar lastSat 2:00 1:00 S i.e., from the last Saturday in March at 02:00 to the last Saturday in September in 02:00, except that in 2001 it didn't start until the last Saturday in April.