Zoroastrian calendar

The Zoroastrian calendar has a year that is 365 days long, composed of 12 months of 30 days each, plus an additional period of 5 days at the end of the year. There are three versions of this calendar with different starting dates for the year. The Qadimi ("Ancient") calendar is used in Iran. The Shenshai ('Royal") calendar is used by the Parsis in India, and is exactly one month (30 days) behind the Shenshai calendar. The newer Fasli ("seasonal") calendar is a solar calendar that has leap years that are 366 days long, and always starts the year at the vernal equinox. The leap years in the Fasli calendar occur in the same years as they do in the Gregorian calendar.

See also calendars, Zoroastrianism