Timestamp on posts 1 hour out
You might also have a corrupt cookie that's still tracking the time as prior to the DST/Standard time change. Those come along every so often and can do anything from giving you a screen full of unread message indicators to screwing up time and date information and a few other things.
I'd offer a course of action, but while I remember bad cookies being a relatively common issue (at least, several years ago they were, I haven't heard much about them lately), I'm computer-illiterate enough that I don't recall how to get rid of them...I think you log out, clear your cache, delete cookies, and then log back in?