2012 Doomsday Date Wrong?

A professor at the University of California at Santa Barbara, Gerardo Aldana, says the Mayan calendar, which many have used to predict the end of the world may not be correct. He claims it may be off by between 50 to 100 years. If that was me, and I was actually smart enough to figure this out, I would let everyone know now. How are we ever gonna plan this party?