title: Converting an array datatime.datetime to float
body: <p>Is it possible to convert something like this;</p>
  
  <pre><code>array([datetime.datetime(2014, 2, 1, 0, 0, 0, 100000),
         datetime.datetime(2014, 2, 1, 0, 0, 0, 300000),
         datetime.datetime(2014, 2, 1, 0, 0, 0, 500000), ...,
         datetime.datetime(2014, 2, 1, 19, 30, 0, 500000),
         datetime.datetime(2014, 2, 1, 19, 30, 0, 700000),
         datetime.datetime(2014, 2, 1, 19, 30, 0, 900000)], dtype=object)
  </code></pre>
  
  <p>to this:</p>
  
  <pre><code>array([  1.39277301e+09,   1.39277301e+09,   1.39277301e+09, ...,
           1.39285442e+09,   1.39285442e+09,   1.39285442e+09])
  </code></pre>
  
  <p>I would basically like to convert the <code>datetime.datetime</code> into a <code>timestamp</code>, with <code>dtype = float</code>.</p>