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Ubify Financial Advisory Board
FINANCIAL ANALYSTS & CPA REVIEWERS
About This Tool
The Islamic Hijri calendar is an astronomical lunar calendar established in 622 CE (marking the emigration or Hijra of Prophet Muhammad from Mecca to Medina). It consists of 12 lunar months totaling 354 or 355 days per year, causing Islamic calendar dates to cycle approximately 10 to 11 days earlier each solar Gregorian year.
This conversion utility converts Gregorian calendar dates into their corresponding Islamic Hijri date (year AH, month name, and day of the month) using the astronomical tabular Islamic calendar algorithm (Kuwaiti algorithm variant based on Julian Day numbers). Because regional religious authorities declare month beginnings based on physical or astronomical crescent moon sightings, the tool includes a manual sighting offset control (-2 to +2 days) to calibrate the output to local regional declarations.
For example, converting November 1, 2026 with a 0-day sighting offset calculates the astronomical date in the year 1448 AH during the month of Jumada al-Awwal.
All calendar math runs locally inside your web browser using client-side JavaScript. No dates, personal schedules, or calendar inquiries are stored or transmitted across the network.
How to Use
- 1
Select your Gregorian date using the calendar picker (defaults to today's date).
- 2
Adjust the Moon Sighting Offset slider if your local regional crescent sighting differs by -1 or +1 days.
- 3
View the converted Hijri date showing day, month name in Arabic/English transliteration, and year AH.
- 4
Copy the calculated Islamic calendar date directly to your notes or documents.
Frequently Asked Questions
Why can the Hijri date vary by one or two days between regions?
The Islamic calendar relies on visual crescent moon sighting or local religious declarations. When the new crescent is sighted in one geographical zone earlier than another, the official start of the month can differ by one day.
How does this tool calculate the Hijri date?
It calculates the Julian Day number of the Gregorian date and maps it into the 30-year astronomical tabular lunar cycle of 10,631 days.
Does this tool send date queries to a remote server?
No. All astronomical calendar calculations run entirely in your local web browser.