How to convert Hijri and Gregorian dates with the Umm al-Qura calendar

The civil question is: what day does the Umm al-Qura table assign to this Gregorian date, or which Gregorian date is 18 Jumada al-Ula 1448? Banks, ministries, visa forms, and most software mean that question. The religious question is: when did a given community sight the crescent, or which authority’s announcement starts the month? Those can differ by a day, and two countries can differ from each other. A converter that claims to be every country’s Hijri date is guessing. This one names its calendar and stays inside it.

The page converts in both directions. Gregorian to Hijri reads the browser’s formatter for that civil day. Hijri to Gregorian searches the same calendar for the Gregorian day whose Umm al-Qura date is the one you typed, and it checks that the day exists. Hijri months have 29 or 30 days. If you ask for day 30 of a month that has 29, the page tells you the length instead of rolling into the next month and hoping you notice. Day 31 is never valid. A Gregorian date that does not exist, such as 31 February, is rejected as well.

Month names are shown in English transliteration and in Arabic: Muharram محرم, Safar صفر, Rabiʻ al-Awwal ربيع الأول, Rabiʻ al-Thani ربيع الآخر, Jumada al-Ula جمادى الأولى, Jumada al-Thani جمادى الآخرة, Rajab رجب, Shaʻban شعبان, Ramadan رمضان, Shawwal شوال, Dhu al-Qiʻdah ذو القعدة, and Dhu al-Hijjah ذو الحجة. The result also shows the weekday of the Gregorian date, in English and in Arabic, so you can check it against a diary.

These are Umm al-Qura dates, and they are the ones this page returns:

• 11 March 2024 is 1 Ramadan 1445.
• 10 April 2024 is 1 Shawwal 1445.
• 1 March 2025 is 1 Ramadan 1446.
• 29 October 2026 is 18 Jumada al-Ula 1448.

If another website disagrees, look at which calendar it claims. A tabular calendar that is not Umm al-Qura, or a sighting-based list, will not match, and that is not a rounding error. Use the calendar the form asked for. When the form says nothing, Umm al-Qura is the usual civil default in software, and you can write the calendar name next to the date so a reviewer knows which rule you used.

The data in current browsers covers 14 March 1937 through 16 November 2077. Outside that window the page refuses the date. An invented conversion for a nineteenth-century document would be worse than an error, because it looks like an answer. For a historical date outside the range, use a specialist reference and cite it. Do not stretch this tool.

The Today button uses the civil date on your device. If it is just after midnight in your time zone, you get that new local date, not yesterday’s UTC date. Internally the conversion is evaluated at noon UTC for that calendar day, so a daylight-saving transition cannot move the result by a day. The weekday belongs to the Gregorian date you are looking at.

One date at a time. Convert the start of a range and the end of a range as two operations. The page does not compute a duration. If you need the number of days between two Gregorian dates, a calendar can subtract them after both Hijri dates have been converted.

1. Open Hijri Date.
2. Choose Gregorian to Hijri or Hijri to Gregorian.
3. Set the day, month, and year. In the Hijri direction the month list shows both names. The day field’s upper bound follows the length of that Hijri month once the year is inside the supported range.
4. Read both cards. Copy the form the application asked for, and keep the other beside it in your own notes if you will need to explain the conversion later.
5. Use Today when you want the current civil day rather than a date from a document.

The fields are not saved. Refreshing the page starts again from the current day once the page has loaded.

Do not use a civil converter to decide the first day of fasting if your community follows local sighting or a specific mosque’s announcement. Check that announcement. Do not use it as evidence in a dispute about a historical date outside the published range. Do not assume every government office uses Umm al-Qura. Some use their own civil table. If an official document prints both dates, trust the document over a reconversion, and use the tool only to spot a typo — if the printed pair is several days apart, one of the printed numbers is wrong, and the tool can show you what the pair should have been under Umm al-Qura.

A date of birth is personal. The conversion still does not leave the browser. No request is sent with the day you typed. After the scripts have loaded, the page works offline. The public site may count the page view, as described in the Privacy Policy and in privacy with online file tools. The date itself is not part of that count.

Why does my phone’s Islamic calendar disagree by one day?

The phone may be set to a different calculation, or to a regional sighting adjustment. Open its calendar settings and read the name of the civil calendar. This page is Umm al-Qura only.

Can I convert a time, not just a date?

No. The tool converts calendar days. The time of day does not change the civil date except insofar as “today” follows your device’s local date.

Is 30 always valid?

No. Some months have 29 days. The error tells you the length. Trust that over a printed calendar that was copied from a different year. Month lengths are not the same every year.

Does the tool know public holidays?

No. It converts dates. A holiday that falls on a Hijri date still needs you to convert that date and then look at the Gregorian weekday.

Open Hijri Date with the calendar name in mind, and write “Umm al-Qura” next to the answer when a reviewer might ask.