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Jalali Calendar

Jalali Calendar Applet

Somewhat old software, but you can still use it as an example for Python/Gtk programming. The date converter part is completely functional.
An applet for avant window navigator for use in x based operating systems spcially Linux under the terms of GNU public license. It shows Iranian calendar (Jalali) and converts Gregorian dates to Jalali. You can even see in which day of week you born!