I know it might be a lot of work and all to implement but I suggest adding in some sort of calendar in a corner with at least stating the day and week number. It's purely just a suggestion
There's something like that already in the game. Not exactly with a week number but at least the day number is being displayed on the phone. And since the math of dividing by 7 isn't that hard, I don't really see much of a reason to add a week number - especially since a week number doesn't have any inherent value in CH.