Countries Fast or celebrate Eid on different days ,but it's haram to fast on eid. What should we do?

The Q&A was aired on : 3rd April 2022 | 2nd Ramadan 1443

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About the Sheikh :
Dr. Muhammad Salah is a PhD holder in Comparative Fiqh.
He had his MBA in Islamic Studies from Cloverdale college, Theological Foundation - Indiana, USA.
He obtained his BA in Shari‘ah and Islamic Law from the University of Al-Azhar in Egypt and a BA in pharmacology.