When did the Hijra start?
Q1. When did the Hijra start?
Answer: on the 12th Rabi-ul-Awwal of the 13th year of Nabvi
Explanation: The Hijra (migration) from Makkah to Madinah began on 12th Rabi ul-Awwal of the 13th year of Prophethood (corresponding to September 622 AD), which later became the starting year of the Islamic calendar.