Hijri to Gregorian Date Converter
Convert dates between the Islamic Lunar Hijri calendar (AH) and the Gregorian Solar calendar (CE) with astronomical calculations and moon sighting adjustments.
Interactive Hijri to Gregorian Date Converter Workspace
Lunar Observation & Moon Sighting Notice
Islamic calendar dates are traditionally determined by actual physical sighting of the crescent moon (Hilal). Algorithmic tabular conversions can vary by 1 to 2 days depending on atmospheric visibility and local community moon-sighting declarations.
1. Conversion Direction
Mathematical Formula & Variables
Hijri Year ≈ (Gregorian Year - 622) × (33 / 32)Converts dates between the 354/355-day lunar Hijri calendar starting from the Migration (622 CE) and the 365/366-day solar Gregorian calendar using astronomical Julian Day Numbers.
Variable Definitions
| Symbol | Description |
|---|---|
| Hijri Date (AH) | Islamic calendar day, month, and year starting 622 CE. |
| Gregorian Date (CE) | Standard international solar calendar day, month, and year. |
| Moon Offset | ±1 or ±2 days adjustment for regional moon-sighting observations. |
How to Use the Hijri to Gregorian Date Converter
- Select your conversion direction: Hijri to Gregorian or Gregorian to Hijri.
- Enter the day, month, and year.
- Adjust the moon sighting offset slider if your local community follows physical moon sighting declarations.
- Click convert to view the corresponding converted date, day of the week, and Islamic month name in English and Arabic.
Hijri Date Conversion Example
Scenario Context: Convert 1 Ramadan 1447 AH to the Gregorian calendar.
Frequently Asked Questions
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