Muhammad ibn Abdullah ibn Abulmottalib ibn Hashim, the Last Prophet of Islam. Muhammad's birthday is considered by Sunni Muslims to be the 12th day of the month of Rabi'-ul-Awwal, the third month of the Muslim calendar,[1] corresponding to April 22, 571. Shi'a Muslims believe it to be the dawn of 17th of the month of Rabi'-ul-Awwal,[2] corresponding to April 27, 571.