There are apparently some problems with the clock somewhere on MO. I noticed that a scheduled post went up at the wrong time but said the right time. Other posts are off by an hour, too. Not sure where the problem lies.
UPDATE: Yeah, I didn’t realize that you had to manually adjust for DST in WordPress. I was thinking it was on my server somewhere. Should be fixed now. Some existing posts and comments are stamped with the wrong time, but I’m not going to worry about updating them.