Answer
Rasulullah (Sallallaahu Alayhi Wasallam) passed away on a Monday. There is no differences of opinion on that. However, according to the Muhaqqiqeen (researchers), it was 2 Rabi-ul-Awwal and according to the Muhadditheen, it was the 12 Rabi-ul-Awwal. And Allah Taãla Knows Best. Was salaam Mufti Ebrahim Desai