Hijri Date Converter — Gregorian to Islamic Calendar

The Hijri calendar is the official Islamic lunar calendar, introduced by Caliph Umar ibn al-Khattab (RA) in 638 CE. It starts from the Hijra — the Prophet Muhammad's ﷺ migration from Mecca to Madinah in 622 CE. The calendar has 12 lunar months totalling 354 or 355 days, meaning the Hijri year is about 11 days shorter than the Gregorian year.

The Hijri calendar is purely lunar — each month begins with the sighting of the new crescent moon and lasts 29 or 30 days. This gives 354–355 days per year, compared to the Gregorian solar year of 365.25 days. Because of this 11-day difference, Islamic events like Ramadan, Eid, and Hajj rotate through all seasons over a 33-year cycle.

The Islamic Civil (Tabular) calendar uses a fixed arithmetic algorithm to determine dates — it is consistent and predictable. The Umm al-Qura calendar, used officially in Saudi Arabia, is based on astronomical calculation of the moon's visibility from Mecca. This converter uses the widely-adopted civil/tabular algorithm. For official Saudi dates (e.g. Hajj, Eid announcements), always verify with the Saudi authorities.

Muharram (محرم) is the first month of the Hijri calendar and one of the four sacred months. The 10th of Muharram, known as 'Ashura', is a day of great significance — the Prophet ﷺ recommended fasting on this day. The other sacred months are Rajab, Dhul Qa'dah, and Dhul Hijjah.

Ramadan is the 9th month of the Hijri calendar. Its start is determined by the actual sighting of the crescent moon (hilal) and may vary by one day between countries. In Saudi Arabia, the Umm al-Qura calendar is used for official determination. This converter can tell you the approximate Hijri date, but for Ramadan start, always follow your local Islamic authority.

Enter your Gregorian birth date in the 'Gregorian → Hijri' converter above. The result gives your Hijri birth date. To find your Islamic birthday this year, note the day and month from the result — that same day and month in the current Hijri year is your Islamic birthday. Note that the Hijri year is shorter, so your Islamic birthday arrives about 11 days earlier each Gregorian year.