Iranian calendars

The Iranian calendars or Iranian chronology (Persian: گاه‌شماری ایرانی, Gāh-Šomāri-ye Irāni) are a succession of calendars invented or used for over two millennia in Iran, also known as Persia. One of the longest chronological records in human history, the Iranian calendar has been modified time and again during its history to suit administrative, climatic, and religious purposes. The most influential person in laying the frameworks for the calendar and its precision was the 11 century Persian polymath, hakim Omar Khayyam. The modern Iranian calendar is currently the official civil calendar in Iran.

The Iranian new year begins at the midnight nearest to the instant of the northern spring equinox, as determined by astronomic calculations for the meridian (52.5°E). It is, therefore, an observation-based calendar, unlike the Gregorian, which is rule-based.[1] This equinox occurs on or about 21 March of the Gregorian calendar. The time zone of Iran is Iran Standard Time, UTC+03:30.

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