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Jalali calendar

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Ubuntu: Jalali Calendar

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Magento: Use Jalali calendar

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A Short History of the Modern Calendar

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Khayyam calendar

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Android : Is there any library or algorithm for Persian (Shamsi or Jalali) calendar in Android?

The Jalali calendar is a solar calendar that was used in Persia, variants of which today are still in use in Iran and Afghanistan. In Iran, the Persian names of the zodiac are used while in Afghanistan the original Arabic names are used, also known as the Solar Hijri Calendar. It gains approximately 1 day on the Julian calendar every 128 years. The tropical Jalali calendar, which inherited some aspects from the Yazdgerdi calendar, was adopted on 15 March 1079 by the Seljuk Sultan Jalal al-Din Malik Shah I, based on the recommendations of a committee of astronomers, including Omar Khayyam, at the imperial observatory in his capital city of Isfahan. Month computations were based on solar transits through the zodiac. It remained in use for eight centuries. It arose out of dissatisfaction with the seasonal drift in the Islamic calendar which is due to that calendar being lunar instead of solar; a lunar year of 354 days, while acceptable to a desert nomad people, proved to be unworkable for settled, agricultural peoples, and the Iranian calendar is one of several non-lunar calendars adopted by settled Muslims for agricultural purposes. Sultan Jalal commissioned the task in 1073. Its work was completed well before the Sultan's death in 1092, after which the observatory would be abandoned.