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How to compare the time in different format from a file?

 
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Old 12-21-2012
How to compare the time in different format from a file?
Code:
15:09:50.350038  Reading A Data
15:09:50.371645  Reading B Data
15:10:55.655724  Initializing models
15:11:31.320920  Preparing Simulation
15:11:32.763217  Running Calculation
15:15:29.668882  Aggregating Results
15:15:29.950897  Persisting Results

How could I make a matrix in H.M.S.MS format as below which is always time differnce between start time of 2nd activity and start time of it's own activity.

Code:
Reading A Data 	(15:09:50.371645 - 15:09:50.350038)
Reading B Data	(15:10:55.655724 - 15:09:50.371645)
Initializing models 	(15:11:31.320920 - 15:10:55.655724)
Preparing Simulation	(15:11:32.763217 - 15:11:31.320920)
Running Calculation	(15:15:29.668882 - 15:11:32.763217)
Aggregating Results	(15:15:29.950897 - 15:15:29.668882)
Persisting Results	(15:15:29.950897)

SO here Reading A data took time A.XMs which is difference from start time of 2nd activity which is 15:09:50.371645 minus it's own start time which is 15:09:50.350038.
Similarly Reading B Data took time B.Yms which is difference of start time of next activity which is 15:10:55.655724(for Initializing models ) minus it's own start time which is 15:09:50.371645.
the process goes on till the last line; as Last activity won't have any time to compare.
 
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