"If the little battery on your motherboard that holds info when your computer is turned off is dead, you may get some anomolies with your date/time. The fact that it goes to a future date kind of makes me wonder if it may be another kind of problem though.
Go ahead and give the box a few wacks with a large hammer. That should do the job."
It could be the motherboard battery...which depending on your motherboard (On a standard Intel board i think it may be a CR2 or 6 battery. Hell i even changed mine on one of my desktops and ran to walgreens to get it at 2am because i was pissed off (Eventually i found out i accidentally switched the jumper cables for boot)
Anyways you could try that, which is the first logical choice (However it makes me wonder why a dead battery would skip ahead to dates that are not yet there.)