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Date Converter (Persian, Hijri, Gregorian)

Convert dates between the Persian (Solar Hijri/Shamsi), Islamic (Lunar Hijri) and Gregorian calendars, with weekday and leap years.

Updated October 16, 2026 By

Runs in your browser Free · No sign-up

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How to use the Date Converter (Persian, Hijri, Gregorian)

  1. Choose the calendar of your date: Gregorian, Solar Hijri (Persian) or Lunar Hijri (Islamic).
  2. Enter the year and pick the month and day – or press “Today”.
  3. Read the date in all three calendars, with weekday and numeric form.

About this tool

Choose the calendar you are converting from, enter a year, month and day, and see the same date in all three calendars at once – including the weekday. Useful for Iranian documents, Islamic holidays, birthdays and historical dates.

  • Private: your data is processed on your device and never uploaded.
  • Free with no account, limits or watermarks.
  • Fast: results appear instantly, even offline once the page has loaded.

What the Date Converter (Persian, Hijri, Gregorian) does

Iran and Afghanistan use the Solar Hijri calendar, also called the Persian, Shamsi or Jalali calendar. Muslim religious dates follow the Lunar Hijri (Islamic) calendar, and most of the world uses the Gregorian calendar. Whenever a birth certificate, a contract, a visa or a holiday involves more than one of them, you need a reliable conversion. This date converter shows any day in all three calendars at once.

Choose the calendar you know, enter the year and select the month and day from lists that show the month names – Farvardin to Esfand, Muharram to Dhu al-Hijjah or January to December. The result shows the full date with the weekday in each calendar, a numeric version for forms, and a note when the year is a leap year. The Today button fills in the current date.

Persian dates are calculated with the well-established 33-year algorithm used by the Iranian calendar, and we checked it against the calendar data built into browsers for every day from 1900 to 2100. Islamic dates come from the Umm al-Qura calendar of Saudi Arabia or the tabular Islamic calendar. Everything runs in your browser.

When to use it

  • Iranian documents

    Convert dates on birth certificates, passports, contracts and school reports from Shamsi to Gregorian for applications abroad.

  • Religious dates

    Find the Gregorian date of Ramadan, Eid or Muharram, or the Islamic date of any day.

  • Birthdays and anniversaries

    Find out your Persian birthday, or which weekday a family date fell on.

  • Business and travel

    Plan appointments and deadlines with partners in Iran, Afghanistan or the Gulf states.

Tips for the best results

  • The Persian new year (Nowruz) falls on 20 or 21 March, so dates in January to mid-March belong to the previous Persian year.
  • The first six Persian months have 31 days, the next five 30 days, and Esfand 29 or 30 days.
  • For official Islamic dates, such as the start of Ramadan, check the announcement in your country – it may differ by one day.
  • Copy the numeric form (for example 1405/07/24 or 2026-10-16) when a form asks for a date in a fixed format.

How the Date Converter (Persian, Hijri, Gregorian) works

Every date is first turned into a Julian Day Number, a simple count of days used by astronomers, and then into the other calendars. This makes all conversions consistent in both directions.

The Solar Hijri calendar is computed with Kazimierz Borkowski’s algorithm, which places leap years in a 33-year pattern and matches the Iranian calendar exactly for the years in use. The Gregorian calendar follows the standard rules.

For the Lunar Hijri calendar, the tool uses the calendar data of your browser (the Unicode CLDR/ICU data): either the Umm al-Qura tables, which are based on astronomical calculation for Saudi Arabia, or the tabular calendar with alternating 29- and 30-day months.

Frequently asked questions

How do I convert a Persian (Shamsi) date to Gregorian?

Select “Solar Hijri” as the source calendar, enter the Persian year and choose the month and day. The Gregorian date appears immediately. For example, 1 Farvardin 1405 is 21 March 2026.

Why can the Islamic date differ by one day?

Islamic months start when the new crescent moon is sighted, which can vary by country. The tool uses the Umm al-Qura calendar of Saudi Arabia or the tabular calendar, so the official date where you live may be a day earlier or later.

Which year is it in the Persian calendar?

The Persian year begins at Nowruz, the March equinox, around 20 or 21 March. From then until the following March, the Persian year is 621 years behind the Gregorian year; before Nowruz it is 622 years behind. 2026 corresponds mostly to 1405.

How are leap years handled?

Gregorian leap years follow the usual rule of every fourth year except most century years. Persian leap years add a 30th day to Esfand, the last month, and follow a 33-year cycle. The tool marks both.

How far back and forward does it work?

Persian and Gregorian dates convert exactly for many centuries, from year 1 of the Persian calendar onwards. Islamic dates follow the Umm al-Qura tables for about 1300–1600 AH and the arithmetic calendar outside that range.

Guides for this tool