Subtracting time in milliseconds - Excel 2010

[wireless73]

Hello all, first time poster. My challenge is discovering the difference in time between two rows of data that is imported with milliseconds in the time slot. In my example below I would like to see how I can subtract the time listed in line 4 from line 3 (11:18:59.566 - 11:18:59.550). When I try now I get either 1.85185E-07 or 00:00.0 or 0.000000 depending how the cell is formatted. Any help or ideas would be appreciated. Thanks

2012 02 17 11:18:59.050|081,999999999999~999999999999
2012 02 17 11:18:59.550|082,MCTO05222CZ0~999999999999
2012 02 17 11:18:59.566|082,1
2012 02 17 11:19:00.144|083,MCTO05246CK0~999999999999
2012 02 17 11:19:00.160|083,3

 

[wireless73]

That is perfect, thank you very much. Thanks everyone.