Hijri ↔ Gregorian Date Converter
Convert Hijri (Islamic) dates to Gregorian and back, using the Umm al-Qura or tabular calendar. Check today's Hijri date, convert a single day or a whole year, and copy citation-ready results, with clear notes on where calculation and the sighted crescent part ways.
Convert a date
How this works, and what it can't promise
Conversions use your browser's built-in Intl / ICU calendar engine, the same Unicode calendar data shipped with the operating system, rather than any hand-rolled month tables. Gregorian dates are formatted directly into the chosen Islamic calendar. Hijri dates are resolved in the other direction by searching for the Gregorian day that formats back to exactly the date you entered, so the two directions are internally consistent.
Umm al-Qura (أم القرى) is the
calculated civil calendar of Saudi Arabia and the Gulf. It is meaningful only across roughly
1300–1600 AH (about 1882–2174 CE); outside that window it should not be trusted as a
historical record. The tabular calendar (islamic-tbla) is a purely
arithmetic 30-year cycle on the astronomical (Thursday) epoch: 1 Muḥarram 1 AH = 15 July 622
CE (Julian) / 18 July 622 (proleptic Gregorian), Julian Day 1948439. It is defined for every
date but is a calculation, never the historically observed month.
Because real Islamic months begin with the sighting of the crescent, any calculated date, Umm al-Qura or tabular, can differ from a locally sighted one by about a day. Treat single-day conversions of historical dates as ±1 day unless corroborated by a dated source.
Questions
- What is today's Hijri date?
- It is shown at the top of this page, computed live in your browser. By default it is the Umm al-Qura date used civilly across the Gulf; switch the system toggle to see the tabular equivalent. Remember the ±1 day caveat against a locally sighted crescent.
- How do I convert a Hijri date to Gregorian?
- Set the direction to Hijri → Gregorian, pick the system, and enter the Hijri year. Add the month and day for a single date, or leave them blank to get the full Gregorian range a year or a month covers.
- What is the difference between Umm al-Qura and the tabular Islamic calendar?
- Umm al-Qura is the Gulf's official calculated civil calendar, reliable about 1300–1600 AH. The tabular calendar is a fixed arithmetic cycle defined for all of history, but it is a calculation and never exactly equals a sighted month. For dates before the Umm al-Qura range, only the tabular calendar is meaningful, and even then it is calculated, not observed.