There was a problem with the server clock which was throwing some dates off on a lot of posts and whatnot. The signups were not affected as far as I can tell, though the signup timestamp when people did sign up in the queue may have been. I believe I have it fixed now, it was a result of the DST change that was made a while ago to extend DST I think it was a week or 2.
2 Weeks ago the server rolled back the clock on its own an hour and I attempted to fix it then, unfortunately when DST really hit, it rolled back more than an hour on its own and times were messed up on some things. I kept thinking I had it fixed but the clock kept rolling itself back on its own and finally I gave up and completely redid the entire clock/date system on the OS from scratch and that seems to have fixed it.
Sorry for any confusion this may have created.
Also, I am still aware of the front page displaying "Previous Events" as a day in the future, this is also something that was affected by these problems but is PHP related. I should have that worked out tomorrow.
Koth beat me to the punch and fixed the "Previous Events" =)
Everything should be fine now. If you spot any more problems please let me know.