What is the start date of the Muslim chronology?

July 16, 622 – hijra (resettlement of the prophet from Mecca to Medina) – the beginning of the Muslim chronology.
The Islamic calendar was introduced by the Caliph of the Arab Caliphate Umar 1.



One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.