What are the White Days of fasting?

The White Days (al-ayyam al-bid) are the 13th, 14th and 15th of each Hijri month — the nights of the full moon — which the Prophet ﷺ encouraged fasting. A Hijri calendar or an app that tracks Islamic dates makes them easy to catch.

Why fast on Mondays and Thursdays?

Authentic hadith describe the Prophet ﷺ regularly fasting Mondays and Thursdays, mentioning that deeds are presented to Allah on those days, and that he was born and received revelation on a Monday.

How do I track makeup (qada) fasts from Ramadan?

Log the number of days owed, then record each makeup fast as you complete it before the next Ramadan. Hayya's fasting tracker includes dedicated makeup fast logging alongside Suhoor and Iftar times.

Fasting Tracker: Ramadan, Monday/Thursday Fasts & the White Days

Updated July 2026 · 5 min read

Fasting in Islam isn't only Ramadan. The sunnah offers a year-round rhythm — Mondays and Thursdays, the White Days of every lunar month, Ashura and Arafah — plus any Ramadan days you owe. The challenge isn't willpower; it's remembering which day is which. That's what a fasting tracker is for.

The fasts worth knowing

Fast	When	Why
Ramadan	9th Hijri month	Obligatory for those able
Qada (makeup)	Before next Ramadan	Repaying missed Ramadan days
Mondays & Thursdays	Weekly	The Prophet ﷺ fasted them regularly; deeds are presented on these days
White Days	13th–15th of each Hijri month	Encouraged in authentic hadith — the full-moon nights
Day of Arafah	9 Dhul-Hijjah	Expiates the previous and coming year (for non-pilgrims)
Ashura	10 Muharram (with 9th)	Expiates the previous year

The two problems every faster hits

1. "What Hijri date is it?"

The White Days, Ashura and Arafah all live on the Islamic calendar — which most phones don't show. Hayya's Hijri calendar keeps the Islamic date on your home screen widget and sends notifications ahead of key days like Arafah, Ashura and the two Eids, so voluntary fasts stop sneaking past you.

2. "When exactly is Suhoor over?"

Suhoor ends at Fajr and Iftar arrives at Maghrib — both move daily. Hayya shows Suhoor and Iftar times at a glance, computed on-device with your chosen calculation method, working fully offline. How those times are calculated →

Hayya app home screen with Hijri date and prayer countdown for Suhoor and Iftar timing — Hijri date + prayer times = fasting on autopilot

Tracking your fasts in Hayya

Log any fast type: Ramadan, Monday/Thursday, White Days, Ashura, Arafah — each tracked in its own right.
Record makeup fasts: a dedicated qada fast log so Ramadan debts don't blur into "I'll get to it."
See Suhoor & Iftar instantly: today's window is always one glance away, even offline.
Stay ahead with the Hijri calendar: notifications for the days you'd otherwise miss.

And like everything in Hayya: no ads, no tracking, all data on your device.

Never miss a White Day again

Fasting tracker + Hijri calendar + Suhoor/Iftar times. Free, offline, private.

Download Hayya Free

FAQ

What are the White Days?

The 13th, 14th and 15th of each Hijri month — the full-moon nights the Prophet ﷺ encouraged fasting.

Can women track makeup fasts from menstruation days?

Yes — missed Ramadan fasts are made up, and Hayya's qada fast log is built for exactly that. See also Haid Mode →

Does the tracker work during travel?

Yes — prayer and fasting times come from a 12-month offline cache, so Suhoor and Iftar stay accurate wherever you land.