Depending on the moon sighting, Eid-ul-Fitr is most likely to fall on the 4th of June. The actual date that Eid al-Fitr is observed is based on the sighting of the moon of Shawwal which is the 10th month in the Islamic calendar. Observers will determine the actual date of Eid al-Fitr by sighting the moon on Monday night, 3rd June.
The holiday celebrates the conclusion of the 29 or 30 days of dawn-to-sunset fasting during the entire month of Ramadan. The day of Eid, therefore, falls on the first day of the month of Shawwal. The date for the start of any lunar Hijri month varies based on when the new moon is sighted by local religious authorities, so the exact day of celebration varies by locality.
Eid Mubarik in advance to everyone!