Interchanging Muslim and Christian Era Dates A Handbook of Precisely Synchronizing Hijrah Era Dates with the Christian Era Dates and Vice Versa from 60 B.H. to 2100 A.H. (564 A.D. to 2659 A.D.), Together with to Ascertain the Day of the Week of any Pre-Hijrah, Post-Hijrah, Julian and Gregorian Calendar Dates