title: Subtracting Two Columns Consisting of Both Date and Time in R
body: <p>I am having a problem with subtracting two columns of a table consisting of both date and time in a single cell. </p>
  
  <pre><code>&gt; TimeData
  
  DEPARTURE_TIME      LAB_TIME
  1/30/2010 4:18      1/30/2010 0:29
  1/30/2010 4:18      1/30/2010 0:29
  1/30/2010 6:49      1/30/2010 0:48
  1/30/2010 6:49      1/30/2010 0:48
  1/30/2010 9:42      1/30/2010 1:29
  1/30/2010 9:42      1/30/2010 1:29
  1/30/2010 7:25      1/30/2010 1:16
  </code></pre>
  
  <p>I need to obtain the difference between Departure Time and Lab Time in hours and minutes.</p>
  
  <p>Do I need to separate time and date or is there a way to subtract the data in this way ?</p>
  
  <p>I really appreciate any help.</p>