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Edit : Oh and the Mayan calendar has 360 days. It doesn't predict an apocalypse, it just stops in 2012, I would guess because they hadn't planned so many centuries ahead. Basing the end of the world on a primitive civilisation who couldn't even get the number of days in a year right is pretty pointless![]()
The Mayans used several different calendars. The Mayan long count calendar has a little under 2 million days. It doesn't stop in 2012 - there are references to dates more than 2000 years later than that carved on Mayan stone pillars. It's a combination of Mayan religion and the standard Mayan format for recording dates. In the same way, using a 6-digit base 10 format for counting days since the birth of Jesus would result in a cycle ending in 2737, i.e. thend end of day 999999.