Changing input fields to a different colour.

The never ending saga of my spreadsheet. So far it is terrific due to help from this forum. The next question, if I am not pushing my luck, is, is it possible to change the text colour automatically along all the fields to do with a weekend date to red. What I mean to say is if you look at what I have created, then it shows the first entry (A7) as a sonday so if I work that day can all the fields horizontally show red text?
thanks again
Alan