Thanks for the heads-up. For lack of better info I'll propose a patch soon that will guess that the future rules are from the 1st Sunday in October to the 3rd Sunday in March, like this: Rule Arg 2007 only - Dec 30 0:00 1:00 S Rule Arg 2008 max - Mar Sun>=15 0:00 0 - Rule Arg 2008 max - Oct Sun>=1 0:00 1:00 S Like Brazil, this is just a guess, it's more likely than their not having daylight-saving at all (until the government changes again....). The Buenos Aires Herald editorialized today, in <http://www.buenosairesherald.com/editorial/editorial_english.jsp?idContent=4...>: "The most striking element in the new package is the return of daylight saving time - a move which in the past has done very much more to cause problems than to offer magic solutions but which is certainly worth trying." The editorial also said that the measure needs to be legislated by Congress next week. A nice Christmas present for everybody concerned, I'll bet.