There are many reasons to call Sunday the first say of the week. Mostly historical ones. Weeks have existed for far longer than the US or in fact any modern cou

There are many reasons to call Sunday the first say of the week. Mostly historical ones. Weeks have existed for far longer than the US or in fact any modern country has. Or the concept of a 5-day work week, in fact. The Monday as the first day of the week is modern revisionism.