I have a FC9/WinXP dual boot machine. When we switched timezones a few weeks ago (from GMT to BST/IST) my computer’s time started behaving oddly. Whenever I rebooted, it always seemed to increment the current time by one hour. This certainly happened when Linux booted, and I think it happened when Windows booted too. Anyway .. it turns out that when you install Linux on a dual boot machine, you should always remember to uncheck the box that says “System uses UTC time”. I suspect I would have encoutered this problem a lot earlier if I lived in a time zone other than GMT±0. Anyway … it turns out you can fix it after the event as per these instructions. In case this link disappears, the instructions are:
1. sudo system-config-time
2. Uncheck the box in “Time Zone” that says “System clock uses UTC”.
3. sudo /usr/sbin/ntpdate pool.ntp.org (to manually reset your computer’s date/time)
