Beware of calendars that set aside a time called “end of suhoor” (or imsaak) differently from the time of Fajr. They contradict the Quran which says: “Eat and drink until the white thread (light) of dawn appears to you distinct from the black thread (darkness of night)” [2:187]. They also contradict the Sunnah and the practices of the companions from all of which suhoor ends exactly at Fajr with the following allowances:
1) If someone doubts if the Fajr is out or not, he can still eat until he is certain.
2) If someone is already eating when the Fajr appears and he hears the Fajr azaan while on his meal, he can complete his meal before putting away the bowl as stated clearly in a hadith.
Also, Fajr is best determined visually from its description by the Messenger as “that which comes with a tinge of redness” [Abu Dawud]. Only visual observation can guide one to know what adjustment to make to the forecasts on phone apps which are generally more sensitive than the naked eyes and can serve only as a guide and are not precisely acurate – especially for Subh. Beware!
Written by: Sheikh Murtado Adedokun, Hafidhahullah