Excel 2007 :: Spreadsheet To Track Group Timeline For Completing Strategy Meetings With Customers

How to use conditional formatting in Excel 2007 (). I'm creating a spreadsheet to track my group's timeline for completing strategy meetings with our customers. When we have a meeting, I will enter the date of that meeting in a specific cell. In a successive column(s), I'd like for a cell(s) to turn a specific color based on the length of time from the last meeting (or if there is no date for a meeting entered - i.e. no initial meeting has been set).