the forum uses info from your computer along with the settings internally to time stamp your posts. Also there is a setting in your userCP to help the process along but Because not all countries or area's of the country use DST or are set properly, and the US in it's infinite wisdom decided to change the date we make the switch, we can not account for what is happening until everyone (all countries and states) are either on DST or not..
The forum server was synced to the national atomic clock and then pushed forward 1 hr (manually) with no automatic adjustments for Daylight savings time.. Any time shifts should resolve themselves in April. I suspect it's just something we will have to live with until then. There were no real patches by microsoft for the DST shift in windows 2000 or older. Only XP and Vista.