Chapter 2: The Prophet’s birth

The Year of the Elephant was the year of the birth of the Prophet (peace be upon him), without any known disagreement among biographers.

Birthday: It was definitely Monday; the evidence is that when asked about Sawm (Fast) on Monday, the Prophet (peace be upon him) replied: That is the day on which I was born, and the day on which I received the Message (or on which Revelation was sent down to me). (Related by Muslim on the authority of Qataadah)… read more here.