title: Conversions of np.timedelta64 to days, weeks, months, etc
body: <p>When I compute the difference between two pandas <code>datetime64</code> dates I get <code>np.timedelta64</code>. Is there any easy way to convert these deltas into representations like hours, days, weeks, etc.?</p>
  <p>I could not find any methods in <code>np.timedelta64</code> that facilitate conversions between different units, but it looks like Pandas seems to know how to convert these units to days when printing timedeltas (e.g. I get: <code>29 days, 23:20:00</code> in the string representation dataframes). Any way to access this functionality ?</p>
  <h2>Update:</h2>
  <p>Strangely, none of the following work:</p>
  <pre><code>&gt; df['column_with_times'].days
  &gt; df['column_with_times'].apply(lambda x: x.days)
  </code></pre>
  <p>but this one does:</p>
  <pre><code>df['column_with_times'][0].days
  </code></pre>