The new year
The Solar Hijri year begins at Nowruz, on the March equinox — usually 20 or 21 March. That is why a Solar Hijri year spans two Gregorian years.
Converting the year
- From Nowruz to 31 December: Gregorian year = Solar Hijri year + 621.
- From 1 January to the day before Nowruz: Gregorian year = Solar Hijri year + 622.
For example, most of 1405 falls in 2026, and its last months fall in early 2027.
Month lengths
- The first six months (Farvardin to Shahrivar) have 31 days.
- The next five (Mehr to Bahman) have 30 days.
- Esfand has 29 days, or 30 in a leap year.
Because the calendar follows the actual equinox, it keeps in step with the seasons very accurately.
Iran's time zone
Iran Standard Time is UTC+3:30. Iran no longer changes its clocks for daylight saving time, so the offset stays the same all year.
Counting days
To count the days between two dates, convert both to the same calendar first. For contracts and deadlines, a calendar tool avoids mistakes around month ends.
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Asaiejadoo — everyday calculation and AI guides, part of the ZIBADIS network founded by Masoud Moghaddam in Tehran.
