How To Check Time Difference in SQL Server

-- How To Check Time Difference in SQL Server

 DECLARE @StartTime DateTime = DateAdd(Mi, -15, GetDate())

 Select @StartTime  StartTime;

 Declare @EndTime DateTime = GetDate()

 Select @EndTime  EndTime

 -- Now See the Difference betwen StartTime and EndTime

Select Convert(Varchar(15), DateAdd(Ms, DateDiff(Ms, @StartTime, @EndTime),0),114) as TimeDifference

--WAITFOR DELAY '00:00:10'