Three of these calendar systems known as the Tzolk'in (the sacred calendar),

1. the Haab
2. the civil calendar

3. the Long Count.
   

This 13-baktun period began on 0.0.0.0.1, August 12, 3114 BC and will end on 13.0.0.0.0, December 21, 2012 AD.

The Mayan Long Count Calendar runs out At sunrise on December 21, 2012,