Tabular Hijri to Gregorian converter
Use it for dates found in history books and manuscripts, or for any year outside the Umm al-Qura range.
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How to use it
- Enter day, hijri month, hijri year and tabular epoch.
- The result appears straight away and updates as you edit.
- Copy the result, or copy a link that keeps the same values to share it.
How it is calculated
JDN = day + ceil(29.5 × (month - 1)) + (year - 1) × 354 + floor((3 + 11 × year) / 30) + 1948439, then the Julian day number is turned into a Gregorian date. Odd months have 30 days, even months 29, and Dhu al-Hijjah 30 in a leap year.
Example
Inputs: Day = 1, Hijri month = 1. Muharram, Hijri year = 1,000 AH, Tabular epoch = Civil: Friday 16 July 622 (most used). Result: Gregorian date: Saturday, 19 October 1591 (1591-10-19); Weekday: Saturday; Days in this month: 30 days.
Limits and caveats
- The result is approximate because historical dates followed sighting and can be one or two days off.
- The Gregorian result is proleptic Gregorian; references usually give dates before 1582 in the Julian calendar.
Questions about this tool
When should I use the tabular calendar instead of Umm al-Qura?
For dates before 1300 AH or after 1600 AH, or to match software that uses the arithmetic calendar.
What is the difference between Gregorian and Julian here?
In the 7th century the Gregorian date is three days ahead of the Julian one, so the Hijra epoch of 16 July 622 Julian is 19 July Gregorian.
How many days are in a tabular Hijri year?
354 days in a common year and 355 in a leap year; the average month is 29.530556 days.