Winter fasting 2026–27
What are the White Days (Ayyam al-Bid)?
The White Days, often called Ayyam al-Bid, refer to the 13th, 14th and 15th of an Islamic lunar month. They do not fall on the same Gregorian dates each month.
Use the Islamic month, not Gregorian dates
A reference to the 13th, 14th and 15th here means dates in the Islamic calendar, not the 13th to 15th of January or February. Reported traditions discuss fasting these lunar dates; ask a scholar about the practice and exceptions.
This is distinct from an instruction to fast on every date a calendar displays. Ramadan and days with fasting restrictions require their own guidance.
Confirm estimated dates locally
Our prayer-time provider supplies calculated Hijri dates for each Gregorian day. These are estimates, not observations of the moon or an announcement from a religious authority. Local dates may shift by a day.
Check your mosque's calendar for the month before making plans. If your local date differs from the displayed estimate, use the full city timetable for the actual Gregorian date rather than assuming the highlighted row must be followed.
Read the times and overlapping labels carefully
The winter list highlights estimated White Days alongside Monday and Thursday. When they overlap, one row carries both labels. Sehri ends at the displayed Fajr and iftar is at Maghrib, in that city's time zone.
Confirm the calculation method and any local mosque margin. Ask a qualified scholar about qada, combined intentions and specific months, including Shaban; scholars may differ.
Useful pages for this guide
Frequently asked questions
Are White Days the 13th to 15th of the Gregorian month?
No. They refer to the 13th, 14th and 15th of the Islamic lunar month, so their Gregorian dates change.
Are the displayed White Days confirmed by moon sighting?
No. They use the provider's calculated Islamic dates. Confirm with local moon-sighting authorities or your mosque; dates may differ by a day.
Why does a date have both Monday and White Day labels?
The Gregorian weekday and the estimated Islamic date overlap. It is one calendar date; ask a scholar about intentions and personal practice.
Sources
Find the times for your location
Fajr marks the end of sehri and Maghrib marks iftar in the iftar.si timetable.