Mdate is a utility that converts Gregorian dates to Mayan Long Count dates. It was originally an implementation of some algorithms published by N. Dershowitz and E.M. Reingold in their book Calendrical Calculations, but is now a GPL project and uses some code derived from other GPL sources.
Alternative to Apple's iCal birthday calendar that has a range of features that has made it indispensable for many iCal and Address Book users.
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