Eid e Milad un Nabi or Mawlid is the birthday of Mohammed, the prophet who is the founder of Islam, known to the world through the holy book Koran. The day comes on Rabi' Al-Awwal, the Islamic calendar's third month which means the spring has commenced. The months of the Islamic calendar begin at the sight of the new moon's first crescent. Because Eid-e-Milad-un-Nabi falls in Rabi' Al-Awwal, it's believed to be a blessed month.