Date Change color the text of field

I created a file to help me manage number of days between dates. It works well. I need help to identify when the dates changes and it adds days maybe one color or when dates are reduced make it another color. In the attached file has a sample it contains column A and B and the dates are calculated on column D. When the a Date is added in the Actual date I need to recalculate the dates in column D and if the date increase highlight one color and if the date decreases make it a different color.