The Calendar Converter at Mac App Store analyse

Easy convert dates between different calendars. The available calendars are: Baháí, Buddhist, Coptic, Ethiopic, Ethiopic Asmete Alem, French Republican, Gregorian, Hebrew, Indian Civil, Islamic, Japanese, Julian, Mayan, Persian and the Quaker Calendar. Add or remove calendars from the list, and copy the selected calendar date to the Clipboard as needed. You can set a number of standard date formats in the preferences, or you can define a custom date format.