==Does Genesis say that that 7th. day had an evening and morning like the other 6 days that had ended?
No, it simply says on the seventh day God rested. How do you interpret God’s day of rest?
Reasoning from the perspective of one who says the days are 24 hrs. would not that 7th day have ended already?
And yes, I am assuming (but not unreasonably so) that each day is of the same length. So that I am not attributing a position to you you do not hold.