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End of Mayan Calendar

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Mayan Calendar

Their number system was in base 20 (as opposed to our base 10) and they used 3 calendars in conjunction with one another. These 3 calendars were known as Haab, Tzolkin and Long Count.

Haab is very similar to our calendar as it is a measure of months in a year.
A year consisted of 18 months with 20 days each, and an extra 5 days following the last day of the last month, giving a total of 365 days.

Tzolkin is a measure of weeks in a year. There are 20 weeks with each week having either 13 or 20 days adding up again to a total of 365 days.

Long count is a measure of days since the beginning of the Mayan era.

As the mayan number system was in base 20, the long count is based off that (with the exception of one count which is base 18)."
A long count date is represented as such: baktun.katun.tun.uinal.kin
uinal = 20 kin = 20 days
tun = 18 uinal = 360 days = approx. 1 year
katun = 20 tun = 7,200 days = approx. 20 years
baktun = 20 katun = 144,000 days = approx. 394 years

baktun's are numbered from 1 to 13, uinals from 0 to 17 and the other units from 0 to 19.

The beginning of the era in the Mayan calendar is 13.0.0.0.0 which corresponds to August 11, 3114 BC.
The last day of the era in the Mayan Calendar is 12.19.19.17.19 which corresponds to December 20, 2012 AD.

So therefore, the following day is when the calendar goes back to 13.0.0.0.0, marking the end of an era.