I am not the most religious guy here, but as I believe even in the bible, there is no such date for doomsday.There is something written there that specifies that no men will know the day the second coming of jesus will be, so there u have it, if god comes that date, it's a lie, no men should know, only god...so if u are a religious being believer in god, rest assure he will come , but not on that date, maybe later or sooner...
And as the prophecies of different cultures including the mayans, what is common on their sayings is that on the date in question will be a change, a huge change ....so there u have it, non believers your answer is there , change of a new global human conscience , maybe, who knows....
Folks if the world ends, we should be happy, no matter how bad it should look, it would definitely be better than it is here, so big smile, folks!