How do we know the current Friday is the Friday that the Prophet ﷺ observed? For example, could this have happened:
- Muslims are observing Friday on a particular day since the Prophet's ﷺ time
- Western colonizers find that the day they call Friday is actually Tuesday for the Muslims
- Muslims are forced to adjust their calendar to have their Fridays align with the colonizers
I find it unlikely Europe was observing Friday on the same day as Muslims at the time of the Prophet ﷺ.
To clarify further, the world is following the Gregorian calendar. We use this for designating what the name of a day of the week is. How do we know we are following the same Friday as that of the Prophet's ﷺ?
More importantly, if we are not observing the correct Friday, will our Friday prayer be accepted?