Conversion from the Gregorian calendar to the Iranian calendar

The Iranian (Persian) calendar is a solar calendar that begins the new year on the vernal equinox. The first 6 months consist of 31 days each, the second half of 5 months consists of 30 days each, and the final month consists of 29 days (30 days in a leap year).
The Iranian calendar is the official calendar in Iran and Afghanistan; it appears that the Iranian calendar is used for daily life, the Hijri calendar for religious matters, and the Gregorian calendar for business.

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