What will happen is that the Mayan calendar will roll over to the next long cycle. We have plenty of real calamities to worry about, natural and man-made, but an artificial date on a calendar is not one of them. It will make an excellent excuse for a party, though, just as the artificial date of January 1, 2000 made a great excuse. It is 2000 years AD, plus or minus 5 years, and the exact day of the year is unknown. So why December 31 would have any significance, except to note the passage of a period of time since the last year, decade, century, is unclear.
What will happen is that the Mayan calendar will roll over to the next long cycle
;-)Something very terrible is goning to happen to the Mayans on Dec 2012.
Look at all the money the gov. wasted on Y2K.
Wait till they hear about 2012!