Nothing will happen on either of these dates. There is true proof about this, as the tool who came up with all of this is trying to act all smart when all he did was add and multiply a bunch of numbers together to come up with a "mathematical" formula and say it added up to May 21, 2011. Well, if you believe in God then you will be saved on this day, but if you don't, you will go through five months of torture and a Hell on Earth through famines, diseases, and other stuff, and finally, the world will finally blow up on October 21, 2011. But don't believe that bullcrap just because some old dude said it was true. Besides, he's 88 years old. What does he know? I'm Christian and I've read the Bible enough to say that no one, not even Jesus himself or the angels, know when the world will end. Only God knows, and He's not telling.