Baha'i Week Number Calculator

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

1. 1

   Step 1

   Enter your date in the Baha'i calendar: day, month, and year.

2. 2

   Step 2

   We walk the real Baha'i calendar — 19 months × 19 days (361 days) plus 4–5 intercalary days — instead of a flat 30-day-month average.

3. 3

   Step 3

   The output breaks down years, months, and days on real Baha'i lengths.

• 1

  This Baha'i Week Number follows Baha'i 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

  Before a Baha'i date goes into a booking or a flight, re-enter it in a second tool as a cross-check — pages like Baha'i Week Number apply fixed rules and cannot warn about a transposed input digit.

• 3

  Time zones can move a Baha'i 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 Baha'i week number is only comparable inside the same convention.

• Midnight and time-zone rollover flip whole days: a date near 00:00 belongs to the previous or next day depending on zone, which shifts day counts and weekdays computed under the Baha'i calendar. Fix one time zone for all inputs.