Mayan calendar converter
Enter a date to see its Mayan Long Count and the matching day in the 260-day Tzolk'in and the 365-day Haab', or type a Long Count such as 13.0.0.0.0 to find the Gregorian date. The conversion uses the standard GMT correlation.
Runs in your browser: nothing you enter is sent anywhere.
How to use it
- Choose the direction: Gregorian to Mayan, or Long Count to Gregorian.
- Enter a date as YYYY-MM-DD, or a Long Count with five numbers.
- Read the Long Count, the Tzolk’in and Haab’ names, and the day count.
How it works
The date is converted to a Julian day number, and the day count since 0.0.0.0.0 is that number minus 584 283 (the GMT correlation). The count is split into baktun (144 000 days), katun (7 200), tun (360), winal (20) and kin (1). The Tzolk’in and Haab’ are found from the same day count: day 0.0.0.0.0 was 4 Ahau 8 Kumk’u.
Worked examples
- 21 December 2012 is 13.0.0.0.0, 4 Ahau 3 K’ank’in, 1 872 000 days from the start.
- 13.0.0.0.1 is the next day, 22 December 2012.
Good to know
The Gregorian dates are computed as if the Gregorian calendar had always been in use, even before 1582. Scholars citing Julian-calendar dates for the Maya period will therefore differ by days.
Frequently asked questions
What does 13.0.0.0.0 mean?
It is a Long Count date, a day count written in a base-20 style. 13 baktun is 13 × 144 000 days, or 1 872 000 days after the start of the count. It fell on 21 December 2012 in the GMT correlation, which is why that day was called the end of a cycle.
What is the GMT correlation?
It is the rule that ties the Long Count to our calendar. Day 0.0.0.0.0 is Julian day number 584 283, which is 11 August 3114 BCE in the proleptic Gregorian calendar. Some scholars use 584 285, two days later, which would move every date by two days.
What are the Tzolk'in and the Haab'?
The Tzolk'in is a 260-day cycle of 13 numbers running together with 20 day names. The Haab' is a 365-day year of 18 months of 20 days plus a short month of 5 days, Wayeb'. Together they repeat every 52 years.
Why is 0.0.0.0.0 not accepted as a date?
It falls in 3114 BCE, which is outside the years 1 to 9999 this converter handles. Long Counts from about 7.18.0.0.0 on land in common-era years.