check box if date is 90 days prior to today

Hi!

I'm trying to have a box checked if the Due Date is 90 days out. I seem to have that part right

=IF([RR Due Date]@row <= TODAY() + 90, 1, 0)

But it's checking all boxes if they are blank. What can I add to the formula to ignore boxes that are blank?

Thanks so much!

Answers

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