Two ancient texts confirm the end date of the Mayan Long Count calendar on the winter solstice of this year, which is Dec. 21, 2012. That day is the last day of the 13th bak'tun, or 144,000-day cycle, of the calendar. Ancient Maya would have seen the end of the 13th bak'tun as the end of a full cycle of creation.
However, experts in Mayan history say the end of the Long Count calendar is the equivalent of needing to acquire a new calendar every year in December — not a harbinger of doomsday.
- Robert Welton: Twitter