A friend of mine spoke to me regarding this last week and i did some research on it. Apparently the world as we know it will end on this date. The winter equinox-21-12-12.
It falls at the end of the Mayen calender and is one of Nostrodamus's predictions. The Earth, the Sun and the Galaxy all line up for the first time in 26,00 years and all hell will break loose. They reckon (experts) that the Earths' axis will turn, even so slighlty meaning climate and all sorts will change.