Mayan Calendar Converter
Convert Gregorian dates to Mayan Long Count, Tzolkin, and Haab calendar components.
Understanding the Mayan Calendar System
The ancient Maya used several interlocking calendars. The Long Count tracks long periods of time in a positional format. The Tzolkin is a 260-day sacred cycle, and the Haab is a 365-day solar calendar made of 18 months plus a short Wayeb period.
Long Count Structure
A Long Count date is written as Baktun.Katun.Tun.Uinal.Kin. One kin is one day, 20 kin make an uinal, 18 uinals make a tun (360 days), 20 tuns make a katun, and 20 katuns make a baktun. This converter uses the GMT correlation constant 584283 to map Gregorian dates to Mayan day numbers.
Explore related tools such as the Mayan Numeral Converter and Convert Date to Julian Day.
Tzolkin and Haab Dates
The Tzolkin combines a number from 1 to 13 with one of 20 day names, creating a 260-day repeating cycle. The Haab uses 19 named months of 20 days, except Wayeb which has 5 days, producing a 365-day year without leap days.
Frequently Asked Questions
What is the GMT correlation constant?
584283 is the Julian Day Number offset used to align the Mayan Long Count epoch with the Gregorian calendar in the GMT correlation.
Does this include leap years?
Yes. Gregorian leap years are handled when converting to the Julian Day Number before Mayan cycles are calculated.
What was the famous 2012 date?
December 21, 2012 corresponds to Long Count 13.0.0.0.0, Tzolkin 4 Ahau, and Haab 3 Kankin under the GMT correlation.
Are other Mayan correlations supported?
This tool uses the widely published GMT constant 584283. Other scholarly correlations shift dates by a few days.
Can I convert Mayan dates back to Gregorian?
Not in this version. This tool converts Gregorian input into Long Count, Tzolkin, and Haab components only.
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