If your schedule time and actual time are in Col D and E
then you can put in Col F the following to get the difference;
=E2-D2
assuming that row 1 is header row. copy the formula down

Now you can do conditional formatting based on whether the value in F is
positive, zero or negative.

Search for 'conditional formatting' if you don't know how in this forum.

"Matt" wrote:

I am working on a work spreadsheet. I have a column that is for "Scheduled
Departure", and right next to it, a column for "Actual Departure". First I
want to calculate how late or early the actual departure was in a separate
column (red for late, Green for Early) and then I want it to calculate the
percent of on time departures for the entire day. Any help with this formula?