Unity Week The distance between the 12th of Rabi al-Awal, the anniversary of the birth of the Prophet of Islam (PBUH) according to Sunni narrations, and the 17th of Rabi 'al-Awal is the date of birth of Prophet Muhammad (PBUH) according to Shiite narrations. Unity Week in 1981, at the suggestion of Ayatollah Montazeri and with the approval of Imam Khomeini, was known by this name.

The International Conference on Islamic Unity is held annually by the World Assembly for the Rapprochement of Islamic Religions in Iran during Unity Week.