Wellll....don't believe what everyone else says...No one knows, there might be a possibility that the world will end as much as any other day. If we die, then we die. If we are still alive then we keep living.
A popular doomsday belief is that the world will end on December 21 or December 23, 2012, based on this being the year the Mayan Long Count calendar system ends. There is no reliable evidence, however, that ancient Mayans held any association between this date and a major cataclysmic event.