Eid al-Fitr will begin on Monday May 2 as the Shawwal moon was not sighted on Saturday, Saudi Arabia's Supreme Court said according to the official Saudi Press Agency (SPA).
Countries which marked the beginning of the holy month of Ramadan on April 2 will thus conclude the 30th day of Ramadan on May 1.
The UAE, Qatar, Iraq, Kuwait, Bahrain, Palestine, Syria, Yemen, Lebanon, Egypt, Sudan and Turkey also announced that the first day of Eid al-Fitr will be May 2, the International Astronomical Center said on Twitter.
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Eid al-Fitr celebrations follow the end of Ramadan which lasts 29 or 30 days based on when the crescent moon is sighted.
Muslims follow a lunar calendar consisting of 12 months in a year of 354 or 355 days.