Worst with Mayans that have three calendars, none of them based on the Sun or Moon.
To know a specific date you must give the date from two calendars. Unless you live too long the combination from the two dates is unique for your whole life.
The third calendar is long term calendar used for political or historical events, it has a cycle something like 4000 years. At the end of the cycle the calendar is reset and starts counting again from zero, in the same way as the other two very short cycle calendars.
The world will not end in 2012, only the long term calendar will be reset and begin counting again from zero.
2012 means nothing for the Mayans!

Stupidity also evolves!