title: How to parse a log file and calculate the total time spent?
body: <p>If the log file was just like any other log file it is easy to parse.</p>
  <p>But now I have 5 log files containing data such as :</p>
  <pre><code>Time Log:
  2/23/12: 9:10pm - 11:40pm getting familiar with Flash
  2/29/12: 12:50pm - 2:00pm getting familiar with Flash
  3/1/12: 6:00pm - 11:40pm getting familiar with Flash
  </code></pre>
  <p>How to calculate the total time spent by parsing the time log file?</p>