Acces Date

I am trying to get a check box to check if the date is within 90 days, 60 days, or 30 days. It seems to work but for some reason Feb does not come up right. Here is the code I am using.

=(DateDiff(“yyyy”,([Evaluation Date]-30),Date())*365)-DateDiff(“d”,([Evaluation Date]-30),Date())<=0 Any help would be great. Thanks