Know much about the Mayan calendar? Some believe you can set your doomsday clock by the apocalyptic forecast that sets the "end of days" for December 21, 2012. In this History Channel program and in the bonus documentary "Mayan Doomsday Prophecy" (2006), facts are sorted from myth when it comes to exactly how and why that particular date has become popular among the soothsayers of Armageddon. 3 1/3 hrs. total. Widescreen (Enhanced); Soundtrack: English Dolby Digital stereo.