Calendars do not predict things. They are accurate daily subdivisions of a year and they allow crops to be planted at the same time every year that has been determined to be the most advantageous. They also regulate some religious ceremonies. Thats it. There is no way for a calendar to predict the end of the world. Interpreting the nose twitches of a bunny rabbit would be just as good for that purpose. Which is to say absolutely useless.
Here's some websites that offer a lot of predictions that have been made about the end of the world. They might have some Mayan stuff in there, I don't know.