Where in the bible does it give the exact date of the end of the world?

Ya see that's just the thing, there isn't a date! but maybe this whole may 21st thing will bring more people to God, I hope so, if not its just going to scare people, but I do admit it got me thinking "what if it did happen?" and I now want to change my life around and live my life for no body but Jesus so in a way this may 21st thing is sort of a good thing, at least for me it is =)