I'm looking to get Yellow when the due date is between 5-0 days, Red after one day late and otherwise green.
=IF(AND(([Target End Date]@row) = TODAY(), ([Target End Date]@row - 5) >= TODAY()), "Yellow", IF(TODAY() > ([Target End Date]@row + 1), "Red", IF(TODAY() > ([Target End Date]@row - 6), "Green")))