Gregorian to Persian Calendar Converter

The Persian calendar counts its years from the Hijra in 622 CE, but it is solar. Instead of slipping back eleven days a year the way the lunar Hijri calendar does, it begins at the March equinox. Year 1405 AP opened on 21 March 2026 with Nowruz. Its structure descends from the Jalali calendar commissioned in 1079 by Sultan Jalal al-Din Malik-Shah, whose panel of astronomers included Omar Khayyam. Iran made the modern version official in 1925, and Afghanistan ran the same skeleton for decades under a different set of month names.

Month lengths are fixed until the last one: Farvardin through Shahrivar have 31 days, Mehr through Bahman have 30, and Esfand closes the year with 29, or 30 when the year is a leap year. The leap rule is the interesting part, because it is not a divisibility test like the Gregorian one. A year picks up its extra day when the equinox falls in a way that forces 366 days, measured at a reference meridian near Tehran. In practice leap years arrive every four years with an occasional five year gap: 1403 was one, and the next is 1408, not 1407.

The conversion on this page comes from the browser calendar engine, which implements the 33-year arithmetic cycle and reproduces the official leap list in modern use, though it approximates the equinox rule and can diverge far from the present. It runs one direction only, Gregorian to Solar Hijri, and reports the month name, the Persian digits, the weekday, whether the year holds 365 or 366 days, and the date of the next Nowruz. Two checks you can make elsewhere: 11 May 2026 is 21 Ordibehesht 1405, and 20 March 2025 is 30 Esfand 1403, a genuine leap day. The window runs from 1583 to 2999, and nothing here touches the lunar Hijri calendar used for Ramadan.