I swim every day/Monday.
But could I say:
I swim each day/Monday.
PS: I know there are already questions like this, but please, try to understand my question before marking it duplicate without asking me if the other one replies to my question. I already read the other page, but I ask here if I can use it IN THE PRECISE EXAMPLES I HAVE GIVEN.
(forced to emphasize a lot, because very often people here read only half of the question, and mark it as duplicate)