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The Mayan calendar moves in cycles with the last cycle ending in December 2012. This has often been interpreted as the world will end on 21 December 2012, at 11:11 UTC.
The Mayan calendar completes its current “Great Cycle” of the Long Count on the 13th baktun, on 22.214.171.124.0. Using the most common conversion to our modern calendar (the Gregorian calendar) the end of the “Great Cycle” corresponds to 11:11 Universal Time (UTC), December 21, 2012, hence the myriad of doomsday prophecies surrounding this date.
They are adjusted and they do wander over a 4 (??) day period (maybe it is three).