SAWM 360
What exactly are the white days?
Every lunar month, the moon reaches full brightness on the 13th, 14th and 15th nights. These are the Ayyam al-Beed — literally "the white days" — named for the moonlit nights. The Prophet ﷺ advised Abu Hurairah (may Allah be pleased with him) to fast three days of every month, and specifically encouraged these three.
What is the reward?
"Fasting three days every month is like fasting the whole year."— The Prophet ﷺ (agreed upon), since every good deed is multiplied tenfold: 3 × 10 = a month, every month = a year
Three days a month is also the most sustainable fasting habit in Islam — small enough to keep during work weeks, big enough to transform your year.
When are the white days this month?
The white days are the 13th, 14th and 15th of each Hijri month. These are their Gregorian dates for every month from October 2026 to December 2027.
| Hijri month | White days |
|---|---|
| Jumada al-Awwal 1448 | Sat 24 – Mon 26 Oct 2026 |
| Jumada al-Thani 1448 | Mon 23 – Wed 25 Nov 2026 |
| Rajab 1448 | Tue 22 – Thu 24 Dec 2026 |
| Sha'ban 1448 | Thu 21 – Sat 23 Jan 2027 |
| Ramadan 1448 | Sat 20 – Mon 22 Feb 2027 (during Ramadan) |
| Shawwal 1448 | Sun 21 – Tue 23 Mar 2027 |
| Dhul Qa'dah 1448 | Tue 20 – Thu 22 Apr 2027 |
| Dhul Hijjah 1448 | Thu 20 – Fri 21 May 2027 (14th–15th; the 13th is a day of Tashriq) |
| Muharram 1449 | Fri 18 – Sun 20 Jun 2027 |
| Safar 1449 | Sat 17 – Mon 19 Jul 2027 |
| Rabi' al-Awwal 1449 | Sun 15 – Tue 17 Aug 2027 |
| Rabi' al-Thani 1449 | Tue 14 – Thu 16 Sep 2027 |
| Jumada al-Awwal 1449 | Wed 13 – Fri 15 Oct 2027 |
| Jumada al-Thani 1449 | Fri 12 – Sun 14 Nov 2027 |
| Rajab 1449 | Sat 11 – Mon 13 Dec 2027 |
Dates follow the Umm al-Qura calendar, which is calculated in advance. Islamic months begin with the crescent moon, so a date can move by a day depending on where you live — confirm with your local announcement. In Dhul Hijjah the 13th is a day of Tashriq, when fasting is not allowed, so fast the 14th and 15th.
Here's the catch: the white days live on the Hijri calendar, and the Hijri year is ~11 days shorter than the Gregorian one. The 13th–15th of the Islamic month lands on different Gregorian dates every single month — sometimes mid-week, sometimes on a weekend, always drifting. Unless you actively follow the lunar calendar, you find out the white days happened after they've passed.
SAWM 360 solves this with a dual Hijri–Gregorian calendar: the white days are marked with a ☀️ badge every month, and, with reminders on, a notification the evening before helps you remember the niyyah.
How to fast the white days
- Make the intention before Fajr (for a voluntary fast, an intention during the morning also suffices if you haven't eaten).
- Fast from Fajr to Maghrib as usual — the app shows your exact local window.
- You may fast all three days or any you can manage; consecutive is not required.
Never miss the white days with SAWM 360
- Open the Calendar tab — white days carry a ☀️ marker on the dual Hijri–Gregorian calendar (browsing other months requires a free account).
- Turn on the fasting eve reminder — the evening before each white day you get a notification so you can plan suhoor and make your intention.
- Check your window — the day view shows your local Fajr → Maghrib times and estimated duration.
- Mark each day completed — white days count toward your monthly merit badge — ×3 every month.
Frequently asked questions
Do the white days have to be fasted consecutively?
No. All three in a row follows the moon's peak, but you may split them or fast fewer — every day counts. SAWM 360 logs whichever you complete.
What if the 13th falls on a Friday?
Fasting Friday alone is discouraged, but it's fine when it's part of the white days or paired with Thursday or Saturday — which is usually the case here.
When are the white days this month?
They fall on the 13th–15th of each Hijri month; this page lists the Gregorian dates of every month through December 2027 (Umm al-Qura calendar). SAWM 360's calendar also marks them with a ☀️ and, with reminders on, notifies you the evening before.