Good evening Heather

What I think you need to do is set up a cell somewhere with todays date
(=NOW() will always update to todays date when you open the
spreadsheet). In my example, cell E4 contains todays date, D4 the
expiry date. Go to Format Conditional Formatting and select Formula
Is and enter this formula :
=(E4-D4)<30
and then set up the cell / font colour etc and click OK.

HTH

DominicB


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