The White Days: Fasting the 13th, 14th and 15th of Every Month

The White Days (Ayyam al-Beed) are the 13th, 14th and 15th of every Hijri month — the nights when the moon is at its fullest and brightest, which is how they earned the name. Fasting these three days each month is a beloved sunnah of the Prophet ﷺ.

Why fast the White Days?

The Prophet ﷺ said: "Fasting three days every month is like fasting a lifetime" (Bukhari 1979, Muslim 1159) — because every good deed is multiplied by ten, three days count as thirty. Abu Hurairah (may Allah be pleased with him) said the Prophet ﷺ advised him never to leave three things, one of them fasting three days of each month.

When are the White Days?

They follow the Hijri (lunar) calendar, not the Gregorian one, so the dates shift by about 11 days each solar year. The easiest way to know when they fall is Noor's Islamic calendar — the monthly view highlights the White Days automatically, alongside major events like Ramadan, the two Eids and Ashura.

Practical notes

• The fast follows normal fasting rules: from Fajr to Maghrib — check your city's exact times on prayer times.
• If you miss a day, fasting any three days of the month still earns the 'lifetime' reward; the White Days are simply the preferred choice.
• Combine intentions carefully: scholars differ on combining sunnah fasts, but making up missed Ramadan days takes priority.
• The 13th of Dhu al-Hijjah is one of the days of Tashreeq, when fasting is not permitted — fast the 14th, 15th and 16th instead that month, according to some scholars.

Open the Islamic calendar to see this month's White Days at a glance, marked in the monthly grid.