Calendar X

Calendar X is a heavy duty perpetual calendar that offers views across many Calendar disciplines. It computes astronomical events (moon phases, solstice, equinox, moon rise and set, sun rise & set) and displays the information according to the selected calendar system. It supports Julian, Gregorian (in many reforms), Jewish, Islamic, Bahai, Indian Civil, Mayan, Coptic, Ethiopic, Persian, Fasli, Shenshai and Qadimi, . Additionally it will also give date information in Julian, Gregorian, Jewish, Islamic, Bahai", Indian Civil, Mayan, Coptic, Ethiopic, Persian, Fasli, Shenshai, Qadimi, French Revolution, Roman, ISO and Julian Day Number.
Calendar X goes way beyond other calendars. Calendar X is the successor to WunderMoosen's popular Calendar2000 product but it is a completely new product in it's own right written in Cocoa, Objective-C and C.