My computer's time is correct. The only thing that's wrong are the timestamps on the posts and PMs. I'm usually on around midnight, and it's a little confusing when it's 12:45am and the time stamps are telling me that 5am posts are from today.

Perhaps I'm missing something. What do you mean by "updated"? My computer automatically updates its own date and time, but it doesn't have any influence over the site's.