Gregorian to Maya Calendar Converter

Just enter a Gregorian date to convert it into the ancient Maya calendars. Shows the Long Count plus the 260-day Tzolkin, the 365-day Haab, and the Julian Day Number (JDN) used in the calculation.

Input

Gregorian date

YYYY/MM/DD

Pick a Gregorian date to convert it into the ancient Maya Long Count, the 260-day Tzolkin, and the 365-day Haab calendars.

Result

Enter a Gregorian date to convert.

How it works

Pick a Gregorian date and the tool converts that day into the three ancient Maya calendars: the Long Count, the Tzolkin, and the Haab.
The Long Count expresses a day count across five places: Baktun.Katun.Tun.Uinal.Kin. One Kin is one day, 20 Kin make a Uinal, 18 Uinal make a Tun (360 days), 20 Tun make a Katun, and 20 Katun make a Baktun.
The Tzolkin is a 260-day cycle combining numbers 1-13 with 20 day names, while the Haab is a 365-day cycle of 18 months of 20 days plus the 5-day Wayeb. Each cycle turns independently.
The conversion first translates the date into the Julian Day Number (JDN) and then derives each calendar. It uses the GMT (Goodman-Martinez-Thompson) correlation, which sets the Long Count origin 0.0.0.0.0 at JDN 584283, so December 21, 2012 corresponds to 13.0.0.0.0.
Other correlation constants exist, and the result can shift by one to a few days depending on which one you adopt. This tool follows the most widely used GMT correlation and should be treated as a guide.

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