The Maya calendar is a system of complex and highly developed calendars created by the Maya Civilization of pre-Columbian Mesoamerica. This series of calendars, includes a sacred 260-day calendar, called the Tzol'kin, a 365-day calendar called the Haab, and a 52-Haab cycle called the Calendar Round, which synchronised the Tzol'kin and Haab cycles.

The end of the world?

The turn of the great cycle is conjectured to have been of great significance to the Maya, but does not necessarily mark the end of the world. According to the Popol Vuh, a sacred book of the Maya, they were living in the fourth world. The Popal Vuh describes the first three worlds that the gods failed in making and the creation of the successful fourth world were men were placed. They Maya believed that the fourth world would end in catastrophe and the fifth and final world would be created that would signal the end of mankind.

Features:
1.Counting.
2.Days Notification.
3.Read about Maya calendar ( Wikipedia )