There have been a few threads that discussed this problem. The following steps resolved it FOR ME - your mileage may vary, but I suspect this should work for you also.
1) Along the menu bar, you'll see navigation options, such as "Home", "Forum", "Classifieds", "FAQ", etc. At the far right of this bar, you will see "IRC" and "Quick Links". Click on "Quick Links", then "Edit Options".
2) In your Edit Options page, scroll down the page to the "Date & Time Options". There is a correction option for Daylight Savings Time (DST Option). By default, it is usually set to "Automatically Detect", and apparently, it sucks hard at being able to detect automatically. Change this option to "DST Correction Always On".