Windows XP? yes.
I turn my comp off every night. I changed the time to the correct time yesterday and it was even more wonky when I booted up the comp this morning. To my knowledge, this is the first time this has ever happened (first I can remember, I just don't know if yesterday was the first day it had been weird or if it had been off for a while and I just hadn't noticed).

I've fixed it again. I'll shut down my comp once I finish dl-ing White Collar and see if it resets itself again. :)