title: How can I account for period (AM/PM) using strftime?
body: <p>Specifically I have code that simplifies to this:</p>
  
  <pre><code>from datetime import datetime
  date_string = '2009-11-29 03:17 PM'
  format = '%Y-%m-%d %H:%M %p'
  my_date = datetime.strptime(date_string, format)
  
  # This prints '2009-11-29 03:17 AM'
  print my_date.strftime(format)
  </code></pre>
  
  <p>What gives? Does Python just ignore the period specifier when parsing dates or am I doing something stupid?</p>