When Did The Islamic Calendar Start. Church in greece decided to switch to the gregorian calendar in the 1920s, but they tried to improve on the gregorian leap year rules, replacing the “divisible by 400” rule. Is there any authentic hadith which says the islamic calendar started from when the first wahi was revealed to rasulullah (sallallahu ‘alayhi wasallam) or did it start after hijra when.
The islamic calendar started with the month of muharram, arabic for forbidden. The exile (hijra or hegira) of the muslims to the.
