Converting Gregorian dates to Hijri is a daily need in Saudi Arabia, where official transactions, contracts, and government appointments all run on the Hijri calendar. This converter uses the Umm al-Qura calendar — the Kingdom's official calendar issued by KACST — not approximate astronomical formulas.
工作原理
Enter a Gregorian date to get its full Hijri equivalent with the weekday. Conversion uses the Umm al-Qura calendar data built into your browser, matching what official bodies use.
公式
That formula is a mental estimate only; actual conversion uses precise Umm al-Qura tables. The Hijri year is lunar (354–355 days), advancing about 11 days against the Gregorian each year.
计算示例
20 July 2026 corresponds to Monday, 6 Safar 1448 AH. The same Gregorian date lands about eleven days earlier in Hijri every successive year — which is why Ramadan travels through the seasons.
常见问题
Why do some sites differ by a day?
Some use approximate astronomical calculations or other Islamic calendars (like the tabular civil one). This converter uses Umm al-Qura exclusively — Saudi Arabia's official reference for documents and transactions.
Does the month start here match the official moon-sighting announcement?
Umm al-Qura is pre-computed, while the starts of Ramadan, Shawwal, and Dhu al-Hijjah are officially declared by sighting and can occasionally differ by a day. Follow official announcements for worship; the calendar governs documents.
What date range is supported?
Umm al-Qura tables accurately cover roughly 1300–1500 AH (about 1882–2077 CE). Outside that range, conversions become estimates.