Convert any date between the Gregorian (Christian) and Islamic (Hijri) calendars. Select your conversion direction, then enter the day, month, and year — and get back the full converted date including the Hijri month name, day of the week, and numeric date format. Works for historical and future dates alike. Also try the Hebrew Calendar Converter.
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The Islamic Hijri calendar is a lunar calendar consisting of 12 months in a year of 354 or 355 days. It began with the migration (Hijra) of the Prophet Muhammad from Mecca to Medina in 622 CE. Because it is purely lunar, the Hijri year is about 11 days shorter than the Gregorian solar year, so Islamic holidays fall on different Gregorian dates each year. See also our Converted Date — Indian National Calendar Converter.
Select 'Gregorian → Hijri' as the conversion direction, then enter the day, month, and year of your Gregorian date. The calculator will return the corresponding Hijri day, month name, year, and day of the week.
Select 'Hijri → Gregorian' as the conversion direction, then enter the Hijri day, month, and year. The calculator converts the Islamic lunar date to the equivalent date in the Gregorian calendar used internationally today.
Hijri months begin with the sighting of the new crescent moon, which can vary by one day depending on geographic location and local moon-sighting practices. This calculator uses the astronomical (calculated) method, so actual dates declared by local Islamic authorities may differ by a day. You might also find our calculate Japanese Calendar Converter Converted Year useful.
The 12 Hijri months in order are: Muharram, Safar, Rabi I, Rabi II, Jumada I, Jumada II, Rajab, Sha'ban, Ramadan, Shawwal, Dhu'l Qa'dah, and Dhu'l Hijja. Ramadan is the ninth month and the holiest, while Dhu'l Hijja is when the Hajj pilgrimage takes place.
The Hijri calendar starts from 1 Muharram, 1 AH, which corresponds to 16 July 622 CE in the Gregorian calendar. The calendar was formally established during the reign of Caliph Umar ibn al-Khattab.
A regular Hijri year has 354 days, and a leap year has 355 days. Hijri months alternate between 30 and 29 days. Because the Hijri year is roughly 11 days shorter than the Gregorian year, the same Hijri date moves backward through the Gregorian calendar by about 11 days each year.
As of 2025 CE, the Hijri year is 1446–1447 AH. The exact Hijri year depends on the month, since the Hijri new year (1 Muharram) falls at a different point in the Gregorian calendar each year.