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Rounding up datetime to nearest half an hour 

-- An SQL User defined function to round off date time-- to nearest half an hour point
                        

CREATE FUNCTION RoundOffHours( @myTime datetime)
RETURNS datetime
ASBEGIN
        DECLARE @RoundedTime datetime
        SELECT @RoundedTime =
        dateadd( minute,
        CASE
         WHEN (datepart(minute,@myTime)) BETWEEN 0 AND 14
                THEN 0
         WHEN (datepart(minute,@myTime)) BETWEEN 15 AND 30
                THEN 30
         WHEN (datepart(minute,@myTime)) BETWEEN 31 AND 44
                THEN 30
         WHEN (datepart(minute,@myTime)) BETWEEN 45 AND 60
                THEN 60
        END,
        dateadd( minute, - datepart(minute, @myTime),@myTime)
        )
        RETURN @RoundedTime
END



-- Usage :


          SELECT dbo.RoundOffHours('2010-05-11 10:01')
          SELECT dbo.RoundOffHours('2010-05-11 10:14')
          SELECT dbo.RoundOffHours('2010-05-11 10:16')
          SELECT dbo.RoundOffHours('2010-05-11 10:29')
          SELECT dbo.RoundOffHours('2010-05-11 10:31')
          SELECT dbo.RoundOffHours('2010-05-11 10:44')
          SELECT dbo.RoundOffHours('2010-05-11 10:46')
          SELECT dbo.RoundOffHours('2010-05-11 10:59')

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