Program expiration dates in excel

I like to create an excel file, where the days available between date certified and due date, will give me the results in red, amber, or green color.
Explanation below:
Number of days since certification  XX DAYS             CELL 1:E
Due expiration date                         4/8/2014            CELL 2:E
Date certified                                   4/8/2013            CELL 3:E
                                                                                     CELL 4:E
"Number of days since certification" in CELL 1:E will change from the result of "Date certified" in CELL 3:E and the current Date.
60 days before "Due expiration date" i need cell 4:E to become amber.
On "Due expiration date", i need cell 4:E to become red.
All other days before "Due expiration date", cell 4:E will be green.
Also CELL 4:E will show the amount of days left leading up to the expiration date.

Can someone give me feedback on this.