Indian Chronology (Solar, Lunar and Planetary): A Practical Guide to the Interpretation and Verification of Tithis, Nakshatras, Horoscopes and other Indian Time-records, B.C. 1 to A.D. 2000 c23.2

123. The Muhammadan Era, commonly called Hejra or Hijra, is dated from Friday, 16 July, 622 A.D., the day of the Flight of the Prophet.