Islamic calendar starting is relating to: A) Birth of Holy Prophet PBUH B) Treaty of Hudabia C) Hijrat Medina D) Fattah Makkah Related MCQs: Ramzan is the …. month of the Islamic calendar? Identify the Muslim ruler who instituted the Islamic calendar from the year of Prophet’s Migration to Medina? Shawal is which month of Islamic Calendar? Who started the system of the Islamic Calendar?