sql help with inspection

I am trying to create an alert for the managers when the cars are due for inspection. There are 2 fields inspectiondate and nextinspectiondate that are responsible for the inspection. The alert need to be triggered 30 days before its expire .

SELECT 1 as 'Due for Inspection',
isNUll(DATEDIFF(DAY,GETDATE(),c.nextinspectiondate),0) as Next,
isNull(DATEDIFF(DAY,GETDATE(),c.inspectiondate),0) as Curr

   		WHERE C.carActiveIn = 1
   		--and DATEDIFF(DAY,GETDATE(),c.nextinspectiondate) > 0 OR DATEDIFF(DAY,GETDATE(),c.inspectiondate)  > 0
   		ORDER BY C.carKey

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erikTsomikSystem Architect, CF programmer Asked:
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Qlemo"Batchelor", Developer and EE Topic AdvisorCommented:
The dateDiff is correct, but you need to check for exact 30 days (= 30), or less or equal to 30 (<= 30) if you want to get the alert each day.
PortletPaulEE Topic AdvisorCommented:
and use parentheses with the OR condition, like this:

WHERE C.carActiveIn = 1
      DATEDIFF(DAY, GETDATE(), c.nextinspectiondate) <= 30
   OR DATEDIFF(DAY, GETDATE(), c.inspectiondate) <= 30

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