python/pandas - converting date and hour integers to datetime
<p>I have a dataframe that has a date column and an hour column.        </p>

<pre><code>     DATE         HOUR
  2015-1-1         1
  2015-1-1         2
      .            .
      .            .
      .            .
  2015-1-1         24
</code></pre>

<p>I want to convert these columns into a datetime format something like:
<code>2015-12-26 01:00:00</code>  </p>