Mosque Prayer Times vs Your App: Why They Differ

Your phone says Maghrib 17:02; the sheet on the masjid notice board says 17:05. Your phone says Asr 14:36; the masjid says 15:30. Nothing is broken, nobody is wrong, and the differences have ordinary explanations. Here are the six that cover nearly every case, in the order they are worth checking.

1. Adhan time versus iqamah time

This is the big one and the easiest to miss. A masjid timetable often has two columns per prayer:

• Adhan (sometimes "Begins" or "Start"): the moment the prayer window opens. This is the number an app computes.
• Iqamah (sometimes "Jama'ah" or "Prayer"): the time the congregation stands. The masjid chooses it, typically 10 to 30 minutes after the adhan for Fajr, Dhuhr, Asr and Isha, and 3 to 5 minutes after for Maghrib.

Some notice boards print only the iqamah column. If the masjid's "Fajr" is 25 minutes after your app's Fajr, you are almost certainly looking at the iqamah. The window itself opened at the earlier time, and praying at home then is fine. Praying with the jama'ah is rewarded 27 times over (Bukhari 645; Muslim 650), so if you plan to attend, the iqamah is the number to put in your diary.

Many masjids also keep the iqamah fixed for a whole month so people can remember it, and adjust the adhan daily. That makes the gap grow and shrink across the month.

2. Different calculation method

Sunrise, Dhuhr and Maghrib come straight from the sun and match everywhere. Fajr and Isha depend on a chosen angle. An 18° Fajr (Muslim World League) is about 19 minutes earlier than a 15° Fajr (ISNA) in London in February, and the gap widens in summer. Isha moves the other way.

Ask the masjid which method it uses, or compare its Fajr with the prayer times tool under different methods until one matches. The calculation methods article lists what each country's authority uses.

3. Standard versus Hanafi Asr

If only Asr disagrees, and by 30 to 80 minutes, the masjid is using the other shadow rule. Hanafi masjids print the two-shadow Asr; most others print the one-shadow Asr. Some masjids with mixed congregations print the earlier adhan and hold the iqamah after the later time so everyone can join. The Asr article has a table of the gap by city and season.

4. Precaution minutes (ihtiyat)

Many authorities add a safety margin to the astronomical moment: typically 1 to 3 minutes later for Fajr, Dhuhr, Asr, Maghrib and Isha, and 1 to 2 minutes earlier for sunrise. Indonesia's Kemenag and Malaysia's JAKIM build this into their national methods; individual masjids elsewhere often add their own 2 to 5 minutes, especially to Maghrib so nobody breaks the fast before the sun has fully set.

A Maghrib that is 2 to 5 minutes later than your app is almost always this. It is a deliberate caution, not an error.

5. Rounding and coordinates

Apps round the computed time to the nearest minute; some timetables round up for Fajr-side times and down for sunrise so that the printed window is never wider than the real one. That alone produces one-minute differences.

Coordinates matter too. An app uses your phone's location or the city centre; a masjid may use its own address, a postcode centroid, or a table calculated for a nearby larger town. Ten kilometres east to west is about 30 seconds; a table for a city 50 km away can be two or three minutes off.

6. Fixed times at high latitude

In the UK, Scandinavia and parts of Canada, the calculated Isha in June would fall after midnight or not exist, so many masjids fix Isha at, say, 22:30 for the summer weeks and may fix Fajr similarly. Apps that apply "middle of the night" or "one-seventh" rules give different numbers again. This is a community decision made with scholars; see high-latitude prayer times and follow your masjid's table for congregation.

Diagnosing a difference in one minute

What to do

1. For congregation, use the masjid's timetable. It is the agreed schedule of the community you pray with, and the small differences have been thought about by its scholars.
2. For prayer at home, either source is valid as long as you do not pray before the window opens. When unsure, take the later start for the prayer and the earlier Fajr for suhoor.
3. Set your app to match. Pick the masjid's method and Asr rule in the app's settings so the two agree. In our tool these are the first two options above the table.
4. Ask the masjid to share its timetable digitally. A monthly table as a file, a link, or a QR code on the notice board lets people copy the exact iqamah times into their phones rather than retyping them. Our guide on printing a masjid timetable explains how a volunteer can set this up.
5. Do not stitch sources together. Taking the earliest Fajr from one and the latest Isha from another is not a method anyone endorses.

Differences of a few minutes between careful sources are normal and have been for as long as timetables have existed. The point is to pray within the window and, where you can, with the congregation. For anything about your own practice, ask a scholar or imam you trust.