Conversion follows the Umm al-Qura calendar table issued by King Abdulaziz City for Science and Technology — the calendar used to date Saudi court judgments, official gazette issues, and government transactions. The tool converts in both directions, shows the weekday, and flags dates that do not exist in the table, such as day 30 in a 29-day month.
Why specifically Umm al-Qura?
The Hijri calendar adopted in Saudi Arabia is the Umm al-Qura calendar issued by King Abdulaziz City for Science and Technology. Court judgments, notifications, official gazette issues, and government decisions are all dated by it. The tool uses the same official table embedded in modern browsers, so its result matches the date you see on official documents.
When do you need conversion?
An official document dated in Hijri, and you want its place in the Gregorian calendar your payroll and contracts run on.
A court judgment or notification dated in Hijri, and you want to track a statutory period that starts from it — after converting you can use the objection deadline calculator to find the last day.
A Gregorian contract or obligation, and you want its Hijri equivalent for addressing a government body.
Limits of the tool
The table covers the years 1300 AH to 1600 AH. The official calendar can differ by one day from actual moon sighting on religious occasions — the tool shows the official transactional date, not the sighting announcement. Conversion is general calendar information, not a determination of a statutory deadline in a specific case.
Frequently asked questions
How is Umm al-Qura different from an astronomical Hijri calendar?
Umm al-Qura is a pre-computed official table issued by King Abdulaziz City for Science and Technology and used by Saudi government bodies to date transactions. It can differ by one day from actual moon sighting, which governs religious occasions such as the start of Ramadan and the two Eids.
Why does the Hijri date matter for court deadlines?
Court judgments, notifications, and official gazette issues are dated in Hijri, while many contractual obligations and payrolls run on the Gregorian calendar. Accurate conversion between the two prevents a one-day error that could change how a statutory period is counted.
What does it mean that a date does not exist in the table?
Some Hijri months are 29 days long in the Umm al-Qura table, so day 30 of those months does not exist. If you enter such a date the tool shows a warning instead of silently shifting it to another day.
Do the dates I enter leave my device?
No. Conversion runs entirely in the browser using its built-in calendar table, and no date is sent to any server.
Official "About the Umm al-Qura Calendar" page: Umm al-Qura is the official Hijri calendar of Saudi Arabia, first issued in 1346 AH, supervised since 1400 AH by a committee of Sharia and astronomy experts; a new month begins when the crescent is born and the moon sets after sunset in Makkah, computed from the coordinates of the Kaaba since 1420 AH
A sample issue of the official gazette showing the Hijri dating used in publication
2026-07-13
Change log
2026-07-26Moved the Umm al-Qura citation from the calendar's homepage to its "About the Calendar" page and recorded what that page says: the calendar is Saudi Arabia's official Hijri reference, supervised by a scientific committee since 1400 AH, and a month begins when the crescent is born and the moon sets after sunset in Makkah, computed from the Kaaba's coordinates since 1420 AH. A homepage supports nothing specific.
2026-07-13Launched the two-way date converter on the Umm al-Qura table, with detection of non-existent dates
Content on this site is general legal information, not legal advice, and is no substitute for consulting a licensed lawyer. We link you to official sources and do not represent any government body.
Conversion happens on your device — the date never leaves your browser.
