Persian Calendar Converter (Solar Hijri / Shamsi ↔ Gregorian)

How it works

Year starts at Nowruz (1 Farvardin), the day of the March equinox in Iran (March 20 or 21) · months 1–6 have 31 days, 7–11 have 30, Esfand 29 (30 in leap years) · leap years follow the astronomical equinox; here they are computed with Borkowski's break-year algorithm (jalaali-js), which matches the official calendar · Persian year ≈ Gregorian year − 621 (− 622 before Nowruz)

The Solar Hijri calendar (also called Shamsi, Jalali or the Iranian calendar) is the official calendar of Iran and Afghanistan. It counts years from the Hijra of 622 CE, like the Islamic calendar, but its years are solar: each year begins at Nowruz, the Persian New Year, on the day of the spring equinox, and its months are tied to the zodiac, so dates stay in the same season. Because leap years follow the real equinox, they come every 4 years with an occasional 5-year gap, which the calculator reproduces with the standard arithmetic used by Iranian software.

Worked example

Thursday, October 8, 2026: Nowruz 1405 fell on Saturday, March 21, 2026, so October 8 is day 202 of the Persian year. The first six months have 31 days each (186 days) and Mehr began on September 23, which makes October 8 the 16th of Mehr — 16 Mehr 1405 (۱۶ مهر ۱۴۰۵), in autumn. Year 1405 is a common year of 365 days.

Sources: Reingold & Dershowitz, Calendrical Calculations, ch. 15 — The Persian Calendar · jalaali-js — Borkowski's algorithm for the Jalaali calendar

Frequently asked questions