According to Islamic tradition, the first Eid al-Fitr was celebrated in 624 CE.
The celebration followed the Battle of Badr, a major early battle between Muhammad’s followers and the Quraysh of Mecca. It took place after Ramadan, when the Muslim community had completed its month of fasting. Eid al-Fitr therefore became both a religious festival and a communal occasion marking the conclusion of Ramadan.
The year 624 CE corresponds approximately to 2 AH in the Islamic calendar. The Islamic era begins with the Hijra, Muhammad’s migration from Mecca to Medina, dated to 622 CE in the Gregorian calendar. Because Islamic lunar years are shorter than Gregorian solar years, the Gregorian date corresponding to Eid changes annually.
This date should not be confused with the beginning of the Islamic calendar itself or with the first revelation of the Quran, traditionally dated to 610 CE. Eid al-Fitr is observed on 1 Shawwal, immediately after Ramadan, although local communities may differ by a day because the new lunar month is determined through moon sighting or astronomical calculation.