Conditional Formatting With DateDiff

I am attemting to write an expression that changes the background color if the difference between two dates is less than 60 days. I have this expression but it does not work. The color never changes.

=IIF (DateDiff("Day", Fields!pract_start_date.Value, Fields!project_start_date.Value) < 60,"Yellow","White")

Maybe you should wrap the DateDiff() with an ABS() in case the dates are in the wrong order in your function, resulting in a DateDiff of -60 rather than 60?

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That's exactly what was wrong. I had them in the wrong order. I thought I had checked for that but, evidently, did not. Thanks.