Declare the Start and End date
DECLARE @SDATE AS DATETIME
TART_DATE AS DATETIME
DECLARE @END_-- Set Start and End date
SET @START_DATE = GETDATE()
SET @END_DATE = DATEADD(SECOND, 3910, GETDATE())
-- Get the Result in HH:MI:SS:MMM(24H) format
SELECT CONVERT(VARCHAR(12), DATEADD(MS, DATEDIFF(MS, @START_DATE, @END_DATE), 0), 114) AS TimeDiff