The dispute arises because of mathematical differences in the Gregorian and Julian calendars. More on the Feast of Orthodoxy, known to the Jews as
Pascha,
here. The two fell on the same date last year, and won't do so again until 2025. Presuming, of course, the Mayan apocalypse scheduled for 2012 doesn't catch up to us in the interim. Some ancient mathematician may have forgotten to carry a one somewhere. Keep an especial eye on
2020, folks!
Also, you ever notice that a lot of these people die shortly after their big "end of the world" predictions come to naught? I mean, the last big one was Harold Camping, and he went and croaked just over two years after he said the big boom would go down, and it didn't. It's like, well, okay, he was
kind of right, wasn't he?