Answer
The forbidden times of Salaat are stipulated by Rasulullah (Sallallaahu
Alayhi Wasallam) himself. According to the Hanafi Madhab, if any present
Fardh Salaat is performed during the forbidden times, it will be discharged
but Makrooh.
If a person performs Qadhaa Salaat during Makrooh times, it will not be
discharged.
and Allah Ta’ala Knows Best
Mufti Ebrahim Desai