Total time taken

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http://www.unix.com – Hi Friend, Need your help. I have a file which has information of start time and End time . I need to find how much time takes to complete the job . how can I do it in unix command . Example of Log file : Code: Start Loading                    ---Thu Aug  2 17:14:09 EDT 2012  Load completed  successfully---Fri Aug  3 09:00:44 EDT 2012 Moderator's Comments: Code tags for code, please. (HowTos)