I live in Chile and the government has decided to go to winter time later than usual a few months ago. Apple has not provided an update for OS X to reflect this change.
I now fixed the timezones manually by downloading timezone files and using zic to update my mac based on instruction found here http://hints.macworld.com/article.php?story=20070128185822710
The good thing is now that if I set the timezone now to Chile/Santiago in the Date & Time preferences to Santiago/Chile that when I issue the date command in the terminal I get the right time.(still summer time). However all the Mac Clock on the panel and also all Mac Apps are one hour off. They show already winter time.
Any idea on how to get the mac apps show the right time?