The date for ‘Eid al-Fitr and Eid al-Adha is based on sighting of the new moon

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Check below answers in case you are looking for other related questions:
Do different times of moonrise matter, and what should Muslim communities in the West do
If countries differ with regard to when Ramadaan begins and when the day of ‘Arafah is, with whom should I fast?

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The reason for coming back via a different route from the Eid prayer
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Do different times of moonrise matter, and what should Muslim communities in the West do
If countries differ with regard to when Ramadaan begins and when the day of ‘Arafah is, with whom should I fast?

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