A family of Microsoft spreadsheet software with tools for analyzing, charting, and communicating data
Let's say the Promised Arrival Date is in A2:A20 and the Sugg Dock Date in B2:B20.
Select B2:B20. B2 should be the active cell in the selection.
On the Home tab of the ribbon, select Conditional Formatting > New Rule...
Select 'Format only cells that contain'.
Leave the first drop down set to 'Cell Value'.
Select 'greater than' from the second drop down.
Enter the formula =A2-14 in the box next to it.
Click Format...
Activate the Fill tab.
Select a color.
Click OK, then click OK again.