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What's wrong with the DateDiff here?

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Last Modified: 2012-06-27
I have a record that has active and CompletedImpForm both equal to true(or 1, they're bit) with
DateOfFirstVisit=2011-05-01 00:00:00.000

I try to run that just now and no record is selected.  5/15 - 5/1 , is 14 days then why didn't this record got selected?  How to fix this?  Thank you.
select StudyId,accountKey,emailAddress from dbo.Patients  
	where Datediff(d,getdate(), DateOfFirstVisit)%14 = 0
	and Active=1 and CompletedImpForm=1

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"Batchelor", Developer and EE Topic Advisor
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