I have a gannt-like calendar I have created on Google Docs. I also have two columns that say "Due Date" and "Actual Date". Currently, when I type in a due date, the corresponding date on the calendar will highlight in green. If the date in the "Actual Date" column differs from the "Due Date", a red cell with an exclamation point will display in the corresponding date. I would like to somehow figure out a way to have the cell change another color if the actual and due date are the same. That or have a check mark appear. I am open to suggestions.