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Conversion from the Gregorian calendar to the Mayan calendar

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Converts from the Gregorian calendar to the Tzolkin, Haab, and Long Count calendars used by the Maya civilization.
Gregorian calendar
Year
Month
Day
Comparison Method
Tzolkin Calendar     
Haab calendar     
 (Baktun, Katun, Tun, Winal, Kin)
Long Count . . . . 
            From the starting date Day
       = Year Day(Using 360 days per year)
Julian Day days (continuous count)
The Mayan Long Count ends in the Mayan year 5200 (≈ 5125 solar years).
The final day of this Long Count is 12.19.19.17.19=2012-12-20; there was a claim that humanity would perish the following day.
The exact date varies by a few days depending on the theory.

1 Long Count = 13 Baktun = 1872000 days ≈ 5125 solar years
1 Baktun = 20 Katun = 144000 days (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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Conversion from the Gregorian calendar to the Mayan calendar | Keisan