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Convert from Hijri to Gregorian
Have a Hijri date and need the Gregorian equivalent?
Use the converter above instantly, or go straight to the dedicated page for converting Hijri to Gregorian .
This type of conversion is commonly used when:
- Registering a birth date on an international platform
- Completing a form that only accepts Gregorian dates
- Matching an official document written in Hijri
Convert from Gregorian to Hijri
Have a Gregorian date — an appointment, certificate, or record — and need the Hijri equivalent?
You can convert directly on this page, or use the dedicated page for converting Gregorian to Hijri .
This is often used for:
- Finding the Hijri date of a specific occasion
- Aligning dates within regional systems
- Calculating age across both calendars — especially when you need the exact difference between two dates
Why Conversion Is Not Just “Add or Subtract a Number”
The Hijri year is about ten to eleven days shorter than the Gregorian year. That difference accumulates over time.
As the years pass, the Hijri calendar gradually shifts relative to the Gregorian cycle. That’s why there is no single fixed formula that works for every year. Accurate conversion depends on precise data for each specific year and month.
This tool relies on the official Umm al-Qura calendar, a structured reference used in:
- ✓ Government transactions in Saudi Arabia
- ✓ Official documentation
- ✓ Educational records
- ✓ Most local systems
You can learn more about the calendar reference used in our tool via the official Umm al-Qura University website.
How Accurate Are the Results?
As long as the date falls within the supported calendar range, the result matches the structured Hijri calendar reference used for official purposes.
Very distant past or future dates are calculated according to established astronomical standards.
Supported Range (Important for Accuracy)
For transparency: some Umm al-Qura based libraries cover a defined time range with the highest confidence. Outside that range, tools may switch to broader astronomical methods.
On our website, we use tabby-ai/hijri-converter, which documents a supported conversion range from 1343 AH to 1500 AH. You can review the limits directly here: GitHub: tabby-ai/hijri-converter .
That’s why “official-level alignment” is typically strongest within the covered range, while very distant dates may rely on general astronomical models.
Note on Religious Months
Umm al-Qura is calculation-based and structured, but official announcements for months such as Ramadan and Eid are made by authorized bodies in each country. This tool reflects the structured calendar reference, while religious observance follows official announcements in your region.
Why Does a One-Day Difference Sometimes Appear?
You may convert a Hijri date and notice that another website shows a result that differs by one day.
In most cases, this is not a calculation error — it is due to different methods used to determine the start of the lunar month.
If your conversion is connected to an official process, it is always best to follow the calendar reference adopted by the relevant authority.
Frequently Asked Questions
Is this conversion officially recognized?
It is based on the Umm al-Qura calendar, one of the most established Hijri calendar references.
Why do I sometimes see a one-day difference?
Because different calendar systems may use different criteria to determine the start of the lunar month.
Can I convert future dates?
Yes, within the supported calculation range — but there is still no mechanism that can guarantee perfect accuracy for future-date conversions.
Is the conversion accurate for all years?
Official alignment applies within the supported range. Outside that range, dates are calculated using recognized astronomical standards.