The date Eid al-Fitr falls on is decided by the cycle of the Moon. Ramadan is a time for spiritual reflection, prayer, doing good deeds and spending time with family and friends. Eid al-Fitr is a ...
There are also those who mark the new month only after personally seeing a crescent Moon in the sky. So Eid dates differ around the world, though they are usually within one or two days of each other.