Hi,

I'm guessing that this applies to a column of cells so select that column
range then

Format|Conditional format
Select formula is
enter this formula
=AND(A1<"",A1TODAY()-30)
pick a colour

Note that the A1 should be the address of the topmost cell of your range
which in your case may not be A1

Mike

"Cass" wrote:

I know the date that a vehicle needs to go in for it's yearly maintenance and
i want to see if i can cause the cell that the date is in to change color a
month prior to the date....does anyone know if that can be done and how to do
that?