title: Datetime - 10 Hours
body: <p>Consider:</p>
  
  <pre><code>now = datetime.datetime.now()
  now
  datetime.datetime(2009, 11, 6, 16, 6, 42, 812098)
  </code></pre>
  
  <p>How would I create a new datetime object (<code>past</code>) and minus <code>n</code> values from the hours?</p>