According to a new decree, from now on, Daylight Saving Time in Uruguay will start the first sunday of october, at 2:00 local time, and will end the second sunday of march at 2:00 local time That is, from the first sunday of october to the second sunday of march, Uruguay will be at UTC-2 You can see it (in spanish) at http://www.presidencia.gub.uy/_web/decretos/2006/09/CM%20210_08%2006%202006_... I think the rules to add to the zoneinfo files would be the following (please correct as necessary) Rule Uruguay 2006 max - Oct Sun>=1 2:00 1:00 S Rule Uruguay 2007 max - Mar Sun>=8 2:00 0 - Yours, Eduardo Cota.