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Convert from the Mayan Long Count to the Gregorian calendar

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Convert from the Mayan Long Count to the Gregorian calendar.
The Mayan Long Count ends in the Mayan year 5200 (≈ 5125 solar years).
According to one theory, the final day of the Long Count is 12.19.19.17.19 = 2012-12-20, and humanity will perish the following day.
The exact date varies by a few days depending on the theory.
Mayan Long Count
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BaktunKatun  Tun Winal  Kin
Comparison Method
Gregorian Calendar  
Julian Calendar  
Julian Day days (continuous count)
Tzolkin Calendar    
Haab Calendar    
1 Long Count = 13 Baktun = 1872000 Day ≒ 5125 Solar Year
1 Baktun = 20 Katun = 144000 Day (equivalent to 400 Year)
1 Katun = 20 Tun = 7200 day (equivalent to 20 year)
1 Tun = 18 Winal = 360 day (equivalent to one year)
1 Winal = 20 Kin = 20 day (equivalent to one month)

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