Hari Raya Haji (which means "great day of the haj" in Malay), also known as Aidiladha (alternatively spelt as Eid al-Adha, Eid ul-Adha or Eid Adha) or the Great Day of Sacrifice, is a Muslim festival that falls on the 10th day of Zulhijjah (the 12th month in the Islamic calendar).