getting a time diff from strings

I have a log that I am parsing and I can get the login and logout time
string parsed out. It looks like this:

13:50:01 # this is the when the user logged in
14:14:35 # this is when the user logged out

I need to get how much time that is but I am not sure how to go about it
since it is a string (that I assume I have to convert to "real" time to do
the math with).

Robert


.

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