title: Python/PANDAS Date Correction in a DataFrame
body: <p>I have a datetime.date of 2016-12-27 or datetime.date(2016, 12, 27). This afflicts multiple dates, example: 2016-12-27, 2016-11-27.</p>
  
  <p>How can I replace the 27 with just 01 without altering anything else? I have tried things such as:</p>
  
  <pre><code>df.DATE.replace(27, 01)
  df.DATE.replace('-27', '-01')
  df.DATE.replace(', 27', ', 01')
  </code></pre>
  
  <p>Pandas Version is 16.0
  Python 2.7</p>
  
  <p>Thanks for any help!</p>