Aggregate function query

Question

SELECT

COUNT(DISTINCT(CONVERT(VARCHAR(10), Logintime, 101)))

AS COUNT

FROM

UserLoginStatus where UserId=15

HAVING DATEDIFF(MINUTE,MIN(Logintime),MAX(Logouttime))< 480

 

 

above i need to fetch Month(Logintime)  in where condition .

 

if i keep in query it is showing empty otherwise it is showing count as 2

 

how to do that one