Fajr and Isha conventions
Fajr begins at dawn and Isha at nightfall, but organisations define those moments with different solar angles below the horizon, or with a fixed interval after sunset. That single choice can move Fajr by twenty minutes or more. The presets here are the five most requested from the Adhan JS library: North America/ISNA, Muslim World League, Egyptian, Karachi and Umm al-Qura. The table below shows what each one uses.
Asr convention
Asr starts when an object’s shadow reaches a certain length beyond its noon shadow. The standard setting, followed in the Shafi, Maliki and Hanbali schools, uses one shadow length; the Hanafi setting uses two, which makes Asr later, often by 40 minutes to an hour. Only Asr changes; the other five times are unaffected. The Hanafi prayer times page keeps that convention preselected.
High latitudes
Above roughly 48 degrees, twilight can last all night in summer and the angle-based Fajr or Isha may not exist. Three rules are offered:
- Middle of the night: Fajr is never earlier, and Isha never later, than the midpoint between sunset and sunrise.
- Seventh of the night: Fajr and Isha are kept within the last and first seventh of the night respectively.
- Angle based: the night is divided in proportion to the method’s angle, a rule some organisations prefer for consistency.
The default here is middle of the night. When even that cannot resolve an event, the result reads Unavailable and the status line says so; it never shows midnight in place of a real time. Ask your community which rule it follows.
Adjustments
User offsets in whole minutes, from −90 to +90 for each prayer, are added to the library’s own method adjustments. Defaults are zero. The Isha offset is where the extra 30 minutes used with Umm al-Qura during Ramadan is entered explicitly; nothing switches it on automatically. Adjustments that would put the prayers out of order are rejected with a message instead of a wrong table.
Which method should I choose?
Match the timetable your mosque publishes. The city preset is only a starting point: ISNA for North American cities, Muslim World League for Europe and Australasia, and the Egyptian and Karachi presets for Cairo and Karachi. If your mosque uses a convention that is not listed, the closest preset plus a minute adjustment usually reproduces it; the settings note under every result records what you chose.
Why the same city shows different times elsewhere
- A different Fajr or Isha angle, or a fixed Isha interval.
- A different Asr convention.
- A precautionary offset added by the timetable’s publisher.
- Rounding: this site rounds each event to the nearest minute; some publishers round up.
- Coordinates: a mosque on the edge of a metro area can be a minute or two from the city centre used here.
If two sources disagree by more than a few minutes, one of these settings is almost always the reason. This page exists so you can find which.