Most calendars will tell you the Prophet’s birthday falls on 26 August 2026. Ours computes the same date, and marks it an estimate. Both are a convenience.
The Hijri month opens when the new moon is sighted, and the body entitled to declare that sighting differs from one country to the next — a ministry here, a royal court there, a religious authority somewhere else. Twelve Rabi’ al-Awwal is a fixed point in the Islamic calendar. Its Gregorian date is not a fact about arithmetic; it is a decision, taken locally, usually within a day or two of the event.
The divergence is already in the law
This is not only about sighting. Read the instruments and the days part company before anyone looks at the sky.
Morocco appoints two days, the twelfth and the thirteenth of Rabi’ al-Awwal. Guinea’s holiday is the day after the twelfth. Mali keeps the twelfth and then a second observance on the nineteenth — roughly a week later. On our own reading of the appointing instruments, those four rules alone produce 26 August, 27 August and 2 September, in a single year, for neighbouring countries.
Saudi Arabia and Qatar appoint no such day at all.
So the question “when is Mawlid in 2026” has no answer that is true across the region, and any system that returns one date has quietly chosen a country.
What we can stand behind, and what we cannot
We hold announcements from two authorities for 2026. Both name 25 August —
a day before the arithmetic. Everywhere else we are publishing a computed
estimate and saying so: our API returns these dates with precision: estimate,
and a date computed from a Hijri rule is capped at our lowest assurance grade
however well the underlying law is evidenced. Verifying a rule says nothing
about which day a particular year will be declared.
Dates for the remaining jurisdictions are widely reported and we are not repeating them here. They reach us through commercial holiday calendars, and a calendar that cites no authority cannot be checked — including when two of them agree, because two such calendars sharing a supplier are one source wearing two hats. We are collecting the announcements from the declaring bodies and the national news agencies quoting them. Until one arrives for a given country, what we have is an estimate, and calling it anything else would be the error this publication exists to report.
Nigeria, as an illustration
Nigeria’s Public Holidays Act does not fix this date and never has. Its Schedule appoints “such day as the Minister may declare to be a public holiday in celebration of the birthday of the Prophet Muhammed (Id el Maulud)” — the day is statutory, the date is delegated. A calendar showing Nigeria on 26 August is showing you an inference about a decision the Minister makes each year.
That shape is common and rarely visible: the law appoints an occasion, an official appoints the date, and the gap between them is where every published calendar quietly guesses.
If you operate across these markets
Treat 25, 26 and 27 August 2026 as live, and the first days of September for Mali. Confirm against the authority in each country you actually operate in, not against a single regional date. If your systems hold one date for “Mawlid”, they are wrong somewhere — and the closures they miss are general ones, not bank-only.
This notice concerns dates between 22 August and 2 September 2026 and will be marked as history after that.