MySQL DATEDIFF return NULL value

Why the following query return NULL value in the
DATEDIFF coloumn?, Please help

SELECT pagerno,ccode,col5,col6,min(col6) as A,max(col6) as B,
DATEDIFF('B','A') FROM tbldetails WHERE
ccode='28102009103807734' AND
col6 between '2009-11-01' AND '2009-11-15' AND
col5 in ('1','2')GROUP BY pagerno
ORDER BY col6 asc

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