title: Add time to datetime
body: <p>I have a date string like this and then use <code>strptime()</code> So its like this</p>
  
  <pre><code>my_time = datetime.datetime.strptime('07/05/15', '%m/%d/%Y')
  </code></pre>
  
  <p>and now I want to add 23 hours and 59 minutes to <code>my_time</code></p>
  
  <p>I have tried <code>.timedelta</code> but it doesn't work? How could I do this?</p>