I created a calendar in SharePoint and I added in PowerApps like data.
Users can not select after days or next days. It is okay for my app actually.
But I want to add some innovation if it is possible.
I want the previous or next days to appear in a different color, so that the user can more easily understand that they cannot select them.
Is it possible?

I am sharing the code that I have made it unable to make a selection below in case it may help others.
If(Self.SelectedDate > Today() || Self.SelectedDate < Today() , Reset(Self))