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December 21 – The Mesoamerican Long Count calendar, notably used by the pre-Columbian Maya civilization among others, completes a "great cycle" of thirteen b'ak'tuns (periods of 144,000 days each) since the mythical creation date of the calendar's current era. On this day the Long Count date at creation—written 13.0.0.0.0 in modern notation, equivalent to August 11, 3114 BC in theproleptic Gregorian calendar—is repeated for the first time in a span of a little over 5,125 solar years.] The completion of this cycle and the repetition of the previous Creation's Long Count ending date have been central to the 2012 phenomenon. Academic researchers have not concluded that the ancient Maya themselves attached similar significance to this point in time.
December 23 – An alternative date for the completion of the thirteenth B'ak'tun in the Long Count calendar, calculated using another version of the GMT correlation which is supported by a fewMayanist researchers.