title: How to properly add hours to a pandas.tseries.index.DatetimeIndex?
body: <p>I have a normal df.index that I would like to add some hours to it.</p>
  
  <pre><code>In [1]: test[1].index
  Out[2]: 
  &lt;class 'pandas.tseries.index.DatetimeIndex'&gt;
  [2010-03-11, ..., 2014-08-14]
  Length: 52, Freq: None, Timezone: None
  </code></pre>
  
  <p>This is how the first element looks like:</p>
  
  <pre><code>In [1]: test[1].index[0]
  Out[2]: Timestamp('2010-03-11 00:00:00')
  </code></pre>
  
  <p>So I try this to add the hours:</p>
  
  <pre><code>In [1]: test[1].index[0] + pd.tseries.timedeltas.to_timedelta(16, unit='h')
  </code></pre>
  
  <p>However I get this:</p>
  
  <pre><code>Out[2]: Timestamp('2010-03-11 00:00:00.000000016')
  </code></pre>
  
  <p>But I would like to get this:</p>
  
  <pre><code>Out[2]: Timestamp('2010-03-11 16:00:00')
  </code></pre>
  
  <p>What I am missing?. The enviroment is Anaconda (latest) Python 2.7.7, iPython 2.2</p>
  
  <p>Thanks a lot</p>