Precision Hijri to Gregorian Date Converter (Umm al-Qura)
The Hijri and Gregorian Date Converter is an invaluable application designed for Muslims globally, as well as historians, researchers, and professionals working in the Middle East. The Islamic calendar (Hijri) is a lunar calendar consisting of 12 months in a year of 354 or 355 days. Because it is approximately 11 days shorter than the solar Gregorian calendar, Islamic dates shift continuously relative to the Gregorian dates. This makes accurately converting historical events, religious holidays, or official administrative documents a complex mathematical task.
Our converter utilizes the highly accurate Umm al-Qura calendar system, the official calendar utilized in Saudi Arabia and widely accepted by many Islamic organizations around the world. With our intuitive interface, you can seamlessly convert any date from the Gregorian format to the Hijri format, and vice versa, in real-time. Simply select the day, month, and year, and the tool will instantly provide the corresponding date in the other calendar.
This is exceptionally useful for determining the exact dates of religious observances like Ramadan fasting, Hajj, Eid al-Fitr, and Eid al-Adha. Furthermore, it is a vital tool for converting official birth dates on governmental IDs, ensuring your documentation matches precisely when migrating, traveling, or applying for visas. The application runs entirely on your local browser, meaning it provides instant offline conversions without retaining any personal data.
Examples & Use Cases
- Religious Observances: Calculate exactly when the 1st of Ramadan, the Day of Arafah (9 Dhu al-Hijjah), or Eid al-Fitr will occur in the Gregorian calendar to plan vacations.
- Official Documentation: If you are working or living in the Middle East (like Saudi Arabia), you often need your exact Hijri birth date to fill out residency or visa applications.
- Zakat Calculation: Zakat is paid annually based on the lunar Hijri year (roughly 354 days). This converter helps you accurately track your Zakat due date.
- Contract Management: Easily align start and end dates for employment or rental contracts that legally require Hijri dates alongside Gregorian dates.
Why Umm al-Qura?
The Hijri calendar is lunar, meaning months are 29 or 30 days based on the moon's sighting. The Umm al-Qura algorithm uses complex astronomical calculations based on the coordinates of Mecca to predict the new moon, providing a standardized and mathematically precise calendar compared to simple tabular Hijri approximations.
Non-Existent Dates: Why the Converter Sometimes Rejects 30 Ramadan
Unlike fixed-length Gregorian months, a Hijri month's length (29 or 30 days) can only be known from the calendar itself — Ramadan, for instance, has 30 days in some years and 29 in others. Our converter therefore validates that a date actually exists in the Umm al-Qura calendar before converting: the day dropdown automatically offers the correct number of days for the month you selected, and if a link brings you a non-existent date (such as day 30 of a 29-day month), you get a clear message stating the month's real length instead of a silent conversion to a neighboring date — a one-day shift can mean a wrong birth date on an official document or a misplaced Zakat anniversary. The supported conversion range is 1350–1500 AH (roughly 1931–2077 CE), the validity window of reliable Umm al-Qura data.
Frequently Asked Questions
The Umm al-Qura calendar is the official Islamic calendar used by Saudi Arabia. It is calculated based on astronomical principles regarding the moon's position over Mecca, rather than strictly relying on visual moon sightings, making it highly predictable and accurate for date conversion.
While the tool provides highly accurate dates based on the Umm al-Qura astronomical calculations, the actual start of Ramadan and other Islamic months traditionally depends on local moon sightings. You should always refer to your local religious authorities for official announcements.
Yes, once you have loaded the web page, the conversion logic runs completely locally within your browser, allowing you to use it offline.
Our algorithm automatically accounts for leap years in the Gregorian calendar (adding February 29th) and the complex 30-year leap cycle within the standard Hijri calculation to ensure maximum mathematical accuracy.
Yes, occasionally the Hijri date may vary by one day between different countries depending on when the new moon was visually sighted in their specific geographical location. Our tool standardizes this by using the widely accepted Umm al-Qura model.
Yes, it uses the official Umm al-Qura astronomical algorithm which is the standard utilized by the government of Saudi Arabia.
A Hijri month has either 29 or 30 days depending on the year, so a date like 30 Ramadan may exist in one year but not another. When you pick a day that does not exist in the Umm al-Qura calendar for that year, the converter tells you explicitly and shows the month's actual length, instead of silently returning a nearby date that could corrupt your documents.