How to remove the milliseconds from timestamps with sed?

Question

My input file is as follows:

12/13/2011,07:14:13.724,12/13/2011 07:14:13.724,231.56.3.245,LasVegas,US

I wish to get the following:

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Answer 1

This might work for you:

 sed 's/\....//;s/\....//' input_file.csv >output_file.csv