SELECT datediff( HH , '08/09/2014 00:00:44', '08/09/2014 00:08:08') HourDiff,
datediff( mi , '08/09/2014 00:00:44', '08/09/2014 00:08:08') MinuteDiff,
datediff( SS , '08/09/2014 00:00:44', '08/09/2014 00:08:08') SecondDiff -- Calculation for second differences: (8*60)+8-44 = 444 seconds )
/* OUTPUT
HourDiff MinuteDiff SecondDiff
0 8 444
*/