Hijri Date Converter — Islamic ⇄ Gregorian
By the Editorial Team · reviewed against our sources · updated September 2026 · guidance, not a fatwa
Quick answer: Enter any date in the converter below to switch it between the Gregorian and Islamic (Hijri) calendars, in either direction. It uses the Umm al-Qurā calendar, so a result may differ from a local moon sighting by about a day; for Ramadan, Eid or a legal document, confirm the exact day with your local authority.
Gregorian → Hijri
Hijri → Gregorian
Uses the Umm al-Qurā calendar. The start of each Islamic month depends on the local moon sighting, so the exact day can differ by ±1.
Key takeaways
- The tool above converts both ways: Gregorian to Hijri and Hijri to Gregorian.
- It is based on the Umm al-Qurā calendar, the widely used calculated standard.
- Results are close estimates and can differ from a local moon sighting by roughly a day.
- Common uses include finding an Islamic birthday, an anniversary, or a Zakat hawl date.
- A quick month reference is included so you can recognise any Hijri result at a glance.
How to convert Gregorian → Hijri
To turn an ordinary calendar date into a Hijri one, choose the Gregorian direction in the converter above, then pick the day, month and year you want. The tool instantly returns the matching Islamic date, giving you the Hijri day, month name and year followed by “AH”. This is the most common conversion people need, because most of us know a date, such as a birth date or an appointment, in the Gregorian calendar and simply want to see where it sits in the Islamic year. If you only want the current day, the Islamic date today page shows it without any input.
How to convert Hijri → Gregorian
The reverse works just as easily. Switch the converter to the Hijri direction and enter the Islamic day, month and year, and it returns the corresponding Gregorian date. This is useful when a date is given only in the Hijri calendar, for example an event announced as “15 Shaʻban” or a historical date recorded in AH, and you need to know which ordinary calendar day it falls on. Because a lunar month has either 29 or 30 days, a Hijri date you enter for a future month is a calculated estimate; the actual day may move by one once the moon is sighted.
Which calendar (Umm al-Qurā)
The converter uses the Umm al-Qurā calendar, the calculated civil calendar of Saudi Arabia and the standard behind most software and online tools. Rather than depending on a physical crescent sighting, it estimates each month’s start from the moon’s astronomical position, which makes conversions consistent and repeatable. That reliability is exactly what you want for planning and record-keeping. The limitation is that a single calculated calendar cannot match every regional sighting, so a converted date is best treated as an accurate default rather than a binding religious ruling for your specific location.
Why results can differ by a day
If a converted date is a day off from a mosque announcement, a family record or another app, that is expected. Islamic months traditionally begin when the new crescent is actually seen, and the crescent appears at slightly different times depending on your longitude, the weather and viewing conditions. Some communities follow a local sighting, some follow Makkah, and calculated calendars use astronomy, so these valid approaches can place a month’s start a day apart. For everyday conversions the gap is harmless, but for Ramadan, Eid or anything official, verify the exact day with your local authority.
Common conversions people need
People reach for a converter for a handful of recurring reasons. The first is birthdays: finding your Islamic (Hijri) birthday, or working out someone’s age in lunar years. The second is Islamic anniversaries, such as marking a wedding, a passing, or a memorable event on its Hijri date each year. The third, and one this site cares about, is the Zakat hawl date: Zakat falls due after your wealth has been held for one full lunar year, so converting the Gregorian day your wealth first reached the nisab into a Hijri date lets you return to the same point a lunar year later. When that hawl completes, our Zakat calculator works out the amount due.
The 12 months quick reference
To read any Hijri result with confidence, it helps to know the months in order: 1 Muharram, 2 Safar, 3 Rabiʻ al-Awwal, 4 Rabiʻ al-Thani, 5 Jumada al-Ula, 6 Jumada al-Akhirah, 7 Rajab, 8 Shaʻban, 9 Ramadan, 10 Shawwal, 11 Dhul-Qaʻdah and 12 Dhul-Hijjah. Ramadan is the ninth month and Dhul-Hijjah, the month of Hajj, is the twelfth. To understand how the whole system fits together, including why the year is about eleven days shorter than the solar one, see our Islamic calendar overview.
This converter is provided for general reference and is guidance, not a fatwa. Conversions use the calculated Umm al-Qurā calendar and may differ from a local moon sighting by about a day. For Ramadan, Eid, or any official or legal purpose, confirm the exact date with your local mosque or moon-sighting authority.
Frequently asked questions
How do I convert a Gregorian date to Hijri?
Set the converter above to the Gregorian direction, pick the day, month and year, and it instantly returns the matching Islamic date with the Hijri day, month name and year in AH. It uses the Umm al-Qurā calendar.
Can I convert a Hijri date back to Gregorian?
Yes. Switch the converter to the Hijri direction and enter the Islamic day, month and year, and it returns the corresponding Gregorian date. Future Hijri dates are calculated estimates and may shift by a day once the moon is sighted.
Which calendar does the converter use?
It uses the Umm al-Qurā calendar, the calculated civil standard used in Saudi Arabia and most software. It estimates each month astronomically, which keeps conversions consistent, though it may differ from a local sighting.
Why is my converted date off by one day?
Islamic months begin with the new crescent, which is seen at slightly different times around the world. A calculated calendar can therefore differ from a local sighting by about a day. For Ramadan, Eid or official use, confirm locally.
How do I find my Islamic birthday?
Enter your Gregorian date of birth in the converter and it returns your Hijri birthday. Because the lunar year is shorter, your Hijri birthday moves earlier in the Gregorian calendar by about eleven days each year.
How does the converter help with Zakat?
Zakat is due after wealth is held for one full lunar year, called the hawl. Convert the Gregorian day your wealth first reached the nisab into a Hijri date so you can return to the same point a lunar year later and calculate what is owed.