Wa`alaykum as-salamu wa rahmatullahi wa barakatuh.
In the Name of Allah, Most Gracious, Most Merciful.
All praise and thanks are due to Allah, and peace and blessings be upon His Messenger.
In this fatwa:
Regarding the dates of the beginning and end of Ramadan, a Muslim should follow the decision of the Muslim authorities in the country of his residence. It is not his concern what others, especially those on the other side of the globe, do.
Responding to the question, Sheikh Ahmad Kutty, a senior lecturer and Islamic scholar at the Islamic Institute of Toronto, Ontario, Canada, states:
Muslims should strive their best to achieve their unity in all aspects, not only in the beginning and end of Ramadan and celebrating the Eids.
It is against the spirit of Islam to see Muslims in the same country divided in their rituals and their Islamic dates and events. The Islamic spirit is against division and disunity.
Regarding the dates of the beginning and end of Ramadan, you should follow the decision of the congregation, for the Prophet (peace and blessings be upon him) is reported to have said, “Fast with people, break your fast (i.e., celebrate Eid Al-Fitr) with people, and celebrate sacrifice with people.”
So, we are not to make such kinds of decisions based on our own personal preferences or inclinations.
Based on this, if you are living in the USA you must follow the decisions of the Muslims there; if, on the other hand, you are living in another country, then you must go by their decisions.
We should not be creating dissensions in the community on this issue. Let us seek to focus instead on far more important issues that are crucial for the survival of Muslims in this time and age.
Allah Almighty knows best.