Harold Hallikainen wrote: > As far as I can tell, the transition times are always on a Sunday at 2am > local (whether advanced or not).=20 Nope; transition times in Brazil are 00:00 (back to 23:00 of the previous day, or forward to 01:00) . I suspect other countries have other times, too -- the world is a big, messy place :) > The week (and perhaps the month) of the transitions change. Definitely. For Brasil, it even depends on when Carnival is: Generally DST ends on the third Saturday (that is, between Saturday and Sunday) in February -- unless that's the weekend before Carnival, in which case it is one week later. I didn't understand what exactly you want to do. Do you want to create a collection of DST rules? Gerhard --=20 http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .