Hijri ↔ Gregorian Date Converter: Umm al-Qura Calendar (Saudi Arabia)
Convert a Gregorian date to Hijri, or a Hijri date to Gregorian, on the Umm al-Qura calendar, the official calendar of Saudi Arabia, calculated by King Abdulaziz City for Science and Technology (KACST). Each Hijri month has 29 or 30 days, exactly as in KACST's published table, for 1300 to 1500 AH.
This is the Umm al-Qura calendar of Saudi Arabia, calculated in advance. Dates people observe depend on moon sighting by each country's authority and can differ from it.
- Converted date
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- Day of the week
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- Short form (year-month-day)
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- Days in that Hijri month
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Checked 3 November 2026Tested: 20 casesSources: KACST, KACST Umm al-Qura data service
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Assumptions (3)
- The Umm al-Qura calendar of Saudi Arabia, as calculated by KACST, not a moon-sighting calendar.
- Dates are whole days; times of day are not used.
- Only 1300 to 1500 AH (12 November 1882 to 16 November 2077) is covered.
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- KACST's table gives each Hijri month 29 or 30 days; 1 Muharram 1300 AH is 12 November 1882.
- Hijri to Gregorian: count the days of every month before the date, add the day, and add that count to 12 November 1882.
- Gregorian to Hijri: count the days since 12 November 1882 and walk through the month lengths until the count is used up.
Worked example
Tuesday 3 November 2026 on the Umm al-Qura calendar.
| You enter | |
|---|---|
| Convert | Gregorian to Hijri |
| Gregorian date | 3 November 2026 |
| You get | |
| Converted date | 23 Jumada I 1448 AH |
| Day of the week | Tuesday |
| Short form (year-month-day) | 1448-05-23 AH |
| Days in that Hijri month | 30 |
Tuesday, 3 November 2026 is 23 Jumada I 1448 AH on the Umm al-Qura calendar; that month has 30 days.
Questions (3)
Why can a Hijri date here differ from the date in my country?
Umm al-Qura is Saudi Arabia's calendar, calculated in advance by KACST. Countries that start each month by moon sighting, as decided by their own authority, can differ from it. This page converts on Umm al-Qura only.
Which years does it cover?
1300 to 1500 AH, that is 12 November 1882 to 16 November 2077, the years in KACST's table used here. Dates outside that range are refused rather than estimated.
How many days does a Hijri month have?
29 or 30. The page shows how many days the month of your date has in the Umm al-Qura calendar, and refuses a 30th day in a 29-day month.
Sources and checks
Your numbers stay on your device unless you share them.
Dates follow the Umm al-Qura calendar as published by KACST. Dates observed in a country that follows moon sighting can differ; check with that country's authority for official dates. Results are estimates for information only and are not financial, tax or legal advice. Check important figures with a qualified professional before you act on them.