A lunar year is shorter
The Hijri year is about 354 days — roughly 11 days shorter than the Gregorian year. That's why Islamic dates like Ramadan move earlier through the seasons each Gregorian year.
Convert any date between the Gregorian and Islamic (Hijri) calendars instantly. Conversions use the Umm al-Qura calculation and run entirely in your browser — nothing is sent anywhere.
ConvertingGregorianHijri
The Hijri year is about 354 days — roughly 11 days shorter than the Gregorian year. That's why Islamic dates like Ramadan move earlier through the seasons each Gregorian year.
Each Hijri month is either 29 or 30 days long. If a converted date comes back as invalid, it's usually because you entered day 30 of a 29-day month.
We use the Umm al-Qura calendar — the calculated system behind official Saudi dates. Local moon-sighting can shift an observance ±1 day from the calculated date.
For a month-at-a-glance view with the upcoming Islamic events, open the Hijri calendar.
Enter any Gregorian date in the converter above and the equivalent Islamic (Hijri) date appears instantly, calculated with the Umm al-Qura method. Nothing is sent anywhere — the conversion runs entirely in your browser.
Tap “Switch calendar”, then enter the Hijri day, month and year (AH). The matching Gregorian date is shown immediately. If the result reads invalid, the day likely exceeds that month's length — Hijri months have 29 or 30 days.
This tool uses the calculated Umm al-Qura calendar. Communities that begin each month on the physical moon-sighting may observe a date one day earlier or later, so a converted date can differ from your local Islamic date by a day.
Umm al-Qura is the astronomically calculated Hijri calendar used for official dates in Saudi Arabia. It gives a precise, consistent date without relying on local crescent sightings.