title: Set pandas datetime index one day forward
body: <p>Is it possible to set one day forward a datetime index in pandas?</p>
  
  <p>I've got this index</p>
  
  <pre><code>mydata.data.index
  Out[7]: &lt;class 'pandas.tseries.index.DatetimeIndex'&gt;
  [2013-01-27 22:00:00, ..., 2014-12-16 22:00:00]
  Length: 500, Freq: None, Timezone: None
  </code></pre>
  
  <p>and its wrong. The correct date that the data begin is the day after. That is 2014-12-17 and they end at 2013-01-28 </p>
  
  <p>Is there a way to fix this?</p>