Wikipedia: Islamic Calendar - Encyclopedia article about the Islamic or Hijri calendar, used to date events in predominantly Muslim countries and to determine the proper day on which to celebrate Muslim holy days.
Islamic Calendar, The - Backgrounder of the Islamic calendar with sections on what an Islamic year looks like and the difference in years with the Gregorian calendar.
Islamic Finder: Hijiri Calendar - Hijiri to Gregorian date converter offering Ramadan calendar dates and other Islamic event dates.
