In the Mesoamerican calendars, Calendar Round dates are composed by interlacing the dates of the Tzolkin 260 day period (eg the Tzolkin) with that of the 365 day period (known in the Maya language as the Haab). In all, there are 18980 unique dates which arises as a consequence of this interlacing. A Calendar Round cycle thus approximates to around 52 solar years.
A typical Calendar Round date such as 8 Cauac 13 Zip shows the day 8 Cauac of the Tzolkin cycle with 13 Zip month date of the Haab.
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