QTD quarter date from and to

DECLARE @tDate DATETIME

SET @tDate = GETDATE()

 

SELECT @tDate AS 'Input Date',

  DATEADD(q, DATEDIFF(q, 0, @tDate ), 0)

                        AS 'frmDate',      

  DATEADD(d, -1, DATEADD(q, DATEDIFF(q, 0, @tDate ) + 1, 0))

                        AS 'toDate'