The Mesoamerican Long Count calendar is a non-repeating, vigesimal (base-20) and base-18 calendar used by several Pre-Columbian Mesoamerican cultures, most notably the Maya. For this reason, it is sometimes known as the Maya (or Mayan) Long Count calendar. Using a modified vigesimal tally, the Long Count calendar identifies a day by counting the number of days passed since a mythical creation date that corresponds to August 11, 3114 BCE in the Gregorian calendar 1] The Long Count calendar was widely used on monuments.

Maya is also known as Mesoamerican Long Count calendar. The Mayan concept of zero is a shell shape, the a plastron on its top.

nobody knows there is not an exact day.

The (Myan) Mesoamerican Long Count calendar is the basis for a New Age belief that a cataclysm will take place on December 21, 2012.

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To use a Maya calendar, familiarize yourself with the Long Count, Tzolk'in, and Haab calendars. The Long Count is a linear count of days. The Tzolk'in is a 260-day cycle, and the Haab is a 365-day solar calendar. You can combine these calendars to track dates and events in the Maya system.