That's just our yearly calendar. The Mayans had something different that took into account of the end of time itself. If this doomsday is going to happen, I don't believe everyone and everything will die, just most of us.
I am quite sure the world will end when the sun goes supernova. But by that time humans would have left Earth. I'm pretty sure a scientist can calculate when will that happen.
Statistics can predict anything relatively accurately.



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