Eid Milad un Nabi

Mawlid, Mawlid an-Nabi ash-Sharif or Eid Milad un Nabi (Arabic: مَولِد النَّبِي, romanized: mawlidu n-nabiyyi, lit. ’Birth of the Prophet’, sometimes simply called in colloquial Arabic مولد, mawlid, mevlid, mevlit, mulud, among other vernacular pronunciations; sometimes ميلاد, mīlād) is the observance of the birthday of the Islamic prophet Muhammad which is commemorated in Rabi’ al-awwal, the third month in the Islamic calendar.
12th Rabi’ al-awwal is the accepted date among most of the Sunni scholars, while most Shia scholars regard 17th Rabi’ al-awwal as the accepted date, though not all Shias consider it to be this date.