Gregorian to Hijri Converter

About the Gregorian to Hijri Converter

Convert a date between the Gregorian and Islamic calendars, in either direction. Enter a Gregorian date to get the Hijri equivalent, or a Hijri date to get the Gregorian one. The weekday is shown alongside, since it is the same in both systems.

The conversion uses the tabular (arithmetical) Islamic calendar — a fixed, deterministic scheme that repeats on a 30-year cycle. It is the standard used for civil records, software and printed calendars, because it produces the same answer everywhere and can be calculated for any date, past or future.

Locally observed dates work differently and can differ by a day. The page explains why below, and the tool says so rather than presenting a calculated date as though it settled the question.

How to use the Gregorian to Hijri Converter

1. Choose the direction you want to convert.
2. Enter the Gregorian date, or the Hijri year, month and day.
3. Select Convert.
4. Both forms of the date are shown, along with the weekday.
5. The conversion round-trips exactly — converting back gives the original date.

How the conversion works

Both calendars are bridged through the Julian Day Number — a continuous count of days used in astronomy, with no months or years to complicate matters. Convert your date to a JDN, then convert that JDN out into the other calendar.

Using a day count as the intermediate step is what makes the conversion exact and reversible. There is no drift, no accumulated rounding, and dates thousands of years out still convert cleanly.

The Islamic (Hijri) calendar in brief

The Hijri calendar is purely lunar. Twelve months follow the moon’s phases, giving a year of 354 or 355 days — about eleven days shorter than the solar year the Gregorian calendar tracks.

It makes no attempt to stay aligned with the seasons, and that is deliberate rather than an oversight. Because there is no leap month, Islamic dates move steadily backwards through the Gregorian year, completing a full circuit roughly every 33 years. Ramadan therefore falls in every season over a lifetime.

Months alternate 30 and 29 days in the tabular scheme. Dhu al-Hijjah takes an extra day in leap years — 11 years out of every 30 — which keeps the calculated calendar in step with the moon over the long run.

Tabular versus observed dates

This is the single most important thing to understand about Hijri conversion, and the reason two calendars can disagree by a day.

A lunar month runs about 29.53 days, so a real month is either 29 or 30 — and which one it is depends on whether the crescent is sighted on the 29th evening. Sighting depends on weather, geography and the criteria a country applies, so the answer genuinely differs from place to place.

Expect this converter to agree with a locally published calendar most of the time and to differ by ±1 day some of the time. For religious observance — the start of Ramadan, Eid, Hajj — follow your local moon-sighting authority. This tool is for conversion and record-keeping, not for fixing a date of worship.

Why countries announce different dates

• Sighting criteria differ. Some authorities require a naked-eye sighting; others accept optical aid or astronomical calculation.
• Geography matters. The crescent becomes visible at different times across longitudes, so a country to the west may see it a day earlier.
• Some follow another country. A number of communities adopt Saudi Arabia’s announcement regardless of local visibility.
• Weather intervenes. Cloud on the 29th evening usually means the month completes at 30 days.

What to expect from a converted date

Historical dates convert reliably in the tabular system, which is exactly why archives and databases use it. Bear in mind that early Islamic sources record dates by observation, so a converted date from the first centuries AH may sit a day or two from what a chronicler recorded.

For age on the Islamic calendar, use the Hijri age calculator. To measure the span between two Islamic dates, try the Hijri date difference calculator.

Hijri to Gregorian calendar: how to convert

Switch the Direction menu to Hijri → Gregorian. Then enter the Hijri day, month and year. The Gregorian (Miladi) date appears with its weekday.

You will see a few names for the same thing. They all mean the same calendars:

• Hijri, Islamic, Hegira, AH — the lunar calendar that starts with the Prophet's migration (Hijra) to Madinah in 622 CE. AH stands for Anno Hegirae.
• Gregorian, Miladi, AD, CE — the solar calendar used for most civil dates. "Miladi" is the Arabic name.

Quick formula for the year

Need just the year, with no exact date? These rules of thumb get you within one year:

Example: (2026 − 622) × 33 ÷ 32 = 1447.9. So 2026 spans the end of 1447 AH and the start of 1448 AH. The converter above gives the exact day.

Islamic new year dates

The Hijri year starts on 1 Muharram. Because the year is about 11 days shorter, the new year moves earlier in the Gregorian calendar each time.

Local dates can differ by a day, because many countries start each month on a moon sighting. Use the converted date for planning, and confirm religious dates with your local authority.

Hijri to AD, Miladi and “normal” calendar

People search for this conversion in many ways: Hijri to AD, Hijri to Miladi, Hegira to Gregorian, or Arabic to Gregorian date. They all mean the same thing. “Miladi” and “AD” refer to the Gregorian calendar used internationally, and “AH” (Anno Hegirae) marks Hijri years. This converter works in both directions: choose the direction above, enter the date, and it returns the matching day.

Other ways to use this calculator

• Islamic date converter, Islamic calendar converter and Hijri calendar converter — the Hijri and Islamic calendar are the same.
• Hijri date today — leave today’s date in the box to see the current Hijri date.

Frequently asked questions