What is isfirār?

Isfirār is the yellowing of the sun - the stage of its final descent when its light visibly weakens and yellows before setting. In the Ḥanafī school it marks the opening of the last strict prohibited window of the day: from isfirār until Maghrib no prayer is valid, with one deliberate exception - that same day's unperformed Asr, which must still be prayed before the sun sets even though delaying it that long was sinful. Timetables conventionally place isfirār twenty to forty minutes before Maghrib; the value used here is a scholar-reviewed parameter, not a hardcoded constant, and the live ruler below draws today's window for your location.

Rulings differ by madhhab and by what you intend to pray - the live answer below is conditioned on both. Draft pending scholar verification; see the methodology.