What it is and when it occurs
White Days (Ayyam al-Bid) occurs on 13–15 of most Hijri months. Lunar dates begin at sunset and may map to different civil dates by method.
Significance and authentic evidence
Authentic reports encourage fasting these three bright moonlit days as monthly voluntary worship.
Recommended actions: a practical plan
Fast all three when able; any three monthly days also fulfill the broader practice.
- Protect obligatory prayers.
- Choose the established act relevant to this date.
- Add sincere repentance, Qur’an, remembrance and service.
- Confirm local dates and personal rulings with a trusted authority.
Du‘a and dhikr
No White-Days-specific du‘a is established.
Common misconceptions and cautions
The 13th of Dhul Hijjah is a Day of Tashriq and generally is not fasted.
Frequently asked questions
Must every monthly voluntary fast be on the White Days?
The thirteenth, fourteenth and fifteenth are specifically recommended, while fasting any three days of a month also fulfills the broader monthly practice. Avoid days on which fasting is prohibited.
When does White Days (Ayyam al-Bid) occur?
13–15 of most Hijri months. Hijri nights begin at sunset. Gregorian dates depend on the relevant month start; check the linked calendar and your community’s authority.
Sources and references
Primary texts relevant to this guide are linked below. Historical dates and disputed practices are not presented as settled by these texts.