Mayan Calendar 2012
The Maya calendar is a system of calendars used in pre-Columbian Mesoamerica, and in many modern communities in highland Guatemala[1] and in Veracruz, Oaxaca and Chiapas, Mexico[2].
The essentials of the Maya calendar are based upon a system which had been in common use throughout the region, dating back to at least the 5th century BCE
http://en.wikipedia.org/wiki/Maya_calendar