Hello Naomi,According to little bits and bobs I've read(the technical phrase for my lack of knowledge about the subject),The Bible is only supposed to mention Armageddon once but no dates are involved and the word itself is relating to a hill and a place.I think the dates of doom are very much like the supposed second coming given by certain followers of faith.They keep moving the posts(so to speak).The Mayans said 2012/2013 but I wonder what modern South American tribal people think? (if there's any left).
The Mayans believed in Quickening,an acceleration of cosmic and terrestrial events that would end in catastrophe and rebirth, not necessarily complete annihilation for the planet but humans and other life forms will definitely be part of that.