Eating Sehri Thinking That There is Still Time

1. A person woke up late for sehri (sahoor). Thinking that there is still some time for sehri, this person ate or drank something. It transpired, however, that it was already Fajr time. The fast will not be valid of this person.
2. He/she will have to keep a Qadha fast for this one which was forfeited.
3. There is no Kaffaarah (60-day atonement) in this instance.
4. Nevertheless, even if one learns that the fast is not valid, it still remains obligatory to pass the day like how a fasting person passes the day.
5. In other words, it is not permissible for this person to eat and drink in spite of his fast not being valid due to eating after Fajr time.

(Behshti Zewar)