Smart Unit ConvertersSmart Unit Converters

Hijri ↔ Gregorian Date Converter

Convert dates between the Islamic Hijri (lunar) calendar and the Gregorian (solar) calendar. Includes Ramadan and Eid markers.

Date & Time

Hijri ↔ Gregorian Date Converter

Generated on April 25, 2026

?What is the Hijri ↔ Gregorian Date Converter?

The Hijri ↔ Gregorian Date Converter translates dates between the two most-used calendars in the Muslim world. The Islamic / Hijri calendar is a lunar calendar (12 months × ~29.5 days = ~354 days per year) starting from the migration (Hijra) of Prophet Muhammad ﷺ from Mecca to Medina in 622 CE. The Gregorian calendar is a solar calendar (365.25 days) introduced by Pope Gregory XIII in 1582. Because the Hijri year is 11 days shorter, Islamic dates shift backward through the Gregorian year — Ramadan moves through every season over 33 years. This converter uses the Aladhan API which implements the official Umm al-Qura calendar (used in Saudi Arabia and most Muslim countries); local moon-sighting can shift dates by ±1 day.

The Formula

Hijri date = (Julian Day of Gregorian date − Julian Day of 1 Muharram 1 AH) ÷ 354.367 (average lunar year length).

Both calendars are converted via the Julian Day Number — a continuous count of days since 1 January 4713 BCE used in astronomy. The Hijri epoch starts at JDN 1948440 (16 July 622 CE). Modern Hijri date conversion uses the Umm al-Qura tabular calendar, which prescribes specific 29- or 30-day months instead of relying on actual moon sighting; this gives a deterministic answer that can be computed years in advance. Local moon-sighting committees (in Pakistan: Ruet-e-Hilal Committee) may declare the start of a Hijri month one day earlier or later than the official Umm al-Qura calendar.

Practical Examples

1

1 Muharram 1447 AH = 27 June 2025 — the Islamic New Year.

2

1 Ramadan 1446 AH = 1 March 2025 — start of Ramadan in 2025.

3

10 Dhu al-Hijjah 1446 AH = 6 June 2025 — Eid al-Adha 2025 (Bakra Eid).

4

Birth of Prophet Muhammad ﷺ traditionally celebrated on 12 Rabi al-Awwal — varies by year between September and December in the Gregorian calendar.

5

Hijra (the migration that starts the Islamic calendar): 1 Muharram 1 AH = 16 July 622 CE.

6

27 Ramadan (Laylat al-Qadr, Night of Power): a likely odd-numbered night in the last 10 days of Ramadan, considered the most blessed night of the year.

Frequently Asked Questions

Because the Hijri year is ~11 days shorter than the Gregorian year (354 vs 365 days). Each Islamic event therefore moves 11 days earlier in the Gregorian calendar each year, completing a full cycle through every season every ~33 years. This is why Ramadan can be in summer for ~16 years, then in winter for ~16 years.

Popular Conversions

Jump to a ready-made conversion — useful for quick reference and sharing:

Explore More Tools

Age Calculator

Calculate exact age in years, months, and days from date of birth.

Date Difference Calculator

Calculate the exact difference between any two dates in multiple units.

Working Days Calculator

Count working days (Mon-Fri) between two dates, excluding weekends.