| The Tzolkin is a 260-day calendar
            used for religious purposes in the society and rituals. It
            combines a cycle of 13 numbers (13 months) with another
            cycle of 20 named days per month. The numbers run from 1 up to 13. The 20 names and glyphs of the days are: 
 For any fixed day name there are 40 days between subsequent numbers, eg.: 4 Akbal = 3 Akbal + 40 days 5 Akbal = 3 Akbal + 80 days How to use the JavaScript: 
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| Web
              Links | 
| Tzolkin
            (Wikipedia) The Classic Maya Calendar and Day Numbering System Mayan Calendar Description | 
