try this
SELECT b.Client,a.Claim,CAST( a.DateReported AS dATE)AS [DATE], c.Parameter18
FROM dbo.Claim a INNER JOIN
dbo.Client b ON a.Client = b.Client INNER JOIN
dbo.ClaimSupplement c ON a.Claim = c.Claim
Where Master=50
and a.DateReported between '3/1/16' and '6/30/16'
ORDER BY CAST( a.DateReported AS dATE)