http://www.3ok.biz/mc-lite.htmlMillennia Calendar Lite
Millennia Calendar Lite displays 6 calendars, Julian Day and phases of the Moon for 7 thousand years.
The program includes the following calendars:
Gregorian
Julian
Hebrew
Islamic
Coptic
Indian (National calendar of India)
The implemented in the program algorithm is based not on the real Islamic Lunar calendar, but rather on the tabular or schematic calendar developed by Muslim astronomers of the eighth century, which nowadays is used only to convert an Islamic date to a Julian date if no other information is available. This is explained by the fact, that according to Shari'a laws, Moslems determine the beginning of the new month not by the calculation, but by the direct observation of the Moon.