About the Persian Calendar Converter
This Persian calendar converter translates dates between the Gregorian calendar and the Solar Hijri calendar — also called the Jalali, Shamsi or Iranian calendar — in both directions. Enter a Gregorian date to get the Persian year, month and day (in English and Persian script), or enter a Jalali date such as 1 Mehr 1405 to find the Gregorian date and weekday.
It is useful for reading Iranian documents, birth certificates, contracts and news dates, planning around Nowruz, or filling in visa and university forms that ask for the other calendar. The converter also shows whether the Persian year is a leap year, the length of the month, the Gregorian date of Nowruz (1 Farvardin) and a table of when every month of the year begins.
The Solar Hijri year starts at the March equinox, and the calculation uses the widely used 33-year-cycle breakpoint algorithm that reproduces Iran’s official astronomical calendar for present-day years. Afghanistan uses the same year numbering and month lengths, though with different month names (Hamal, Sawr, Jawza …).
How to use the persian calendar converter
- 1Choose Gregorian → Persian or Persian → Gregorian.
- 2Enter the Gregorian date, or the Persian year, month and day.
- 3Read the converted date, weekday and the date in Persian script.
- 4Check whether the year is a leap year and when Nowruz falls.
- 5Use the table to see the Gregorian start date of every Persian month.
Formula and method
The Solar Hijri year begins on Nowruz, the day of the March (vernal) equinox in Iran: if the equinox happens before noon Tehran time, that day is 1 Farvardin; otherwise the next day is. The first six months have 31 days, the next five have 30, and Esfand has 29 days — or 30 in a leap year. Years count from the Hijra in 622 CE, so 1405 SH begins in March 2026.
Leap years are not a simple every-fourth-year rule. The converter uses Borkowski’s algorithm, which places 8 leap years in most 33-year cycles and adjusts the cycle at fixed breakpoint years so the calendar keeps tracking the true equinox. From the leap pattern it finds the March date of Nowruz for each year, then adds the day of the year to get the Gregorian date — or subtracts to go the other way.
- m, d
- Persian month (1–12) and day
- Nowruz
- Gregorian date of 1 Farvardin (19–22 March)
- SH
- Solar Hijri year (Hijri Shamsi, هجری شمسی)
Worked examples
29 September 2026 in the Persian calendar
1405 began on 21 March 2026. The first six months total 186 days, so 1 Mehr was 23 September 2026 and 29 September is 7 Mehr 1405, a Tuesday.
Last day of the leap year 1403
1403 was a leap year, so Esfand had 30 days; 30 Esfand 1403 was Thursday 20 March 2025, the day before Nowruz 1404.
Islamic Revolution anniversary, 22 Bahman 1357
22 Bahman 1357 converts to Sunday 11 February 1979 — the date marked every year as the anniversary of the revolution.
1 January 2000 in Jalali
New Year’s Day 2000 fell on 11 Dey 1378, about two-thirds of the way through the Persian year.
Frequently asked questions
What is today’s date in the Persian calendar?+
Enter today’s Gregorian date with “Gregorian → Persian” selected. For example, 29 September 2026 is 7 Mehr 1405 in the Solar Hijri calendar.
How do I convert Shamsi to Gregorian quickly?+
Add 621 to the Persian year for dates from 1 Farvardin to 10 Dey (roughly 21 March–31 December), or 622 for dates from about 11 Dey to the end of Esfand. The converter handles the exact day.
When is Nowruz?+
Nowruz, 1 Farvardin, falls on 20 or 21 March in present years — the day of the March equinox in Iran (or the next day if it occurs after noon Tehran time). Nowruz 1405 was 21 March 2026.
Which Persian years are leap years?+
Leap years follow the equinox, roughly every four years with an occasional five-year gap. Recent and upcoming leap years are 1399, 1403, 1408, 1412 and 1416; in a leap year Esfand has 30 days instead of 29.
Is the Persian calendar the same as the Islamic Hijri calendar?+
No. Both count from the Hijra in 622 CE, but the Solar Hijri calendar is solar (365–366 days) while the Islamic Hijri calendar is lunar (354–355 days), so their year numbers now differ by about 43 years.