calculating days in mySQL

I am working on a MySQL query I need to calculate days depending on today and a date field I pull
what I need is DateTime.Now - onLocationDatewTime as Days
How can I do that?
SELECT jobid, 
       company, 
       wellname, 
       rig, 
       rignumber, 
       onlocationdatetime, 
       offlocationdatetime, 
       IF(jobinprogress = 1, 'Active', 'Initiated') AS 'Status' 
FROM   job 
WHERE  ( jobinprogress = TRUE 
          OR jobinitiated = TRUE ) 
ORDER  BY jobid ASC;  

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r3nderAsked:
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StampelCommented:
I think you are after DATE_SUB.
SELECT DATE_SUB(NOW(), INTERVAL 4 day);
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r3nderAuthor Commented:
Thanks
I went with DateDIFF(NOW(),onlocationdateTime)
0
StampelCommented:
yeah that will do the trick !
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