Hijri (Islamic) Week Number Calculator

Enter the date values and the tool computes the result for the hijri calendar system.

1. 1

   Step 1

   Enter your date in the Hijri (Islamic) calendar: day, month, and year.

2. 2

   Step 2

   We walk the real Hijri (Islamic) calendar — a lunar year of about 354 days (11 days shorter than the Gregorian, so dates shift ~11 days earlier each year) — instead of a flat 30-day-month average.

3. 3

   Step 3

   The output breaks down years, months, and days on real Hijri (Islamic) lengths.

• 1

  This Hijri (Islamic) Week Number follows Hijri (Islamic) calendar rules — its own epoch, month lengths, and leap years — so the result can differ from a Gregorian-based calculation of the same date; treat the calendar system as part of the input.

• 2

  For deadlines tied to authorities or contracts, confirm which calendar the deadline officially uses before converting it here — a Hijri (Islamic) date read in the wrong system can be off by days or even a full year.

• 3

  Time zones can move a Hijri (Islamic) date by a full day around midnight: today in one zone is still yesterday or tomorrow in another, so anchor the calculation to the zone your event actually follows before you enter anything.

• Week numbering is convention-dependent: ISO weeks start Monday and anchor week 1 to the first Thursday, while other schemes start Sunday or anchor differently. A Hijri (Islamic) week number is only comparable inside the same convention.

• Year-length drift compounds quietly: a Hijri (Islamic) year averages about 354 days, so the same month-day is a different day count every year and a date calculation from one year cannot be scaled to another. Recompute across the exact years involved.