Conditional Formatting on Datetime Field

I am building a report with a query that includes a field of type datetime.
I would like to change the color of the text in this column to RED if the
value contained in the field is earlier than now() - 10 minutes. I would
appreciate direction as to the appropriate function to use in this scenario.
I have tried to work with datediff, but without positive results.
Regards,
Pete Zerger, MCSE(Messaging)
Co-founder and Webmaster, MOMReourcs.org
URL:http://www.momresources.org
mailto:pete.zerger@.gmail.comWill something like this work for you?
=iif(Fields!EventDate.Value < dateadd("n", -10, Now()), "Red", "Black")
Regards,
Dan