Well, you set your own time zone in the General Settings part of your profile. When you aren't logged in, I imagine it defaults to some pre-chosen time zone in the board software. You don't mention which time is correct, the logged in or logged out one. If the logged in time is wrong, check your profile settings. If the logged out time is wrong, either it's set to a different time zone from where you live or it wasn't updated for DST over the weekend.