title: convert pandas._libs.tslibs.timestamps.Timestamp to datetime
body: <p>I want to convert this Timestamp object to datetime this object was obtained after using asfreq on a dataframe this is the last index </p>
  
  <pre><code>Timestamp('2018-12-01 00:00:00', freq='MS')
  &lt;class 'pandas._libs.tslibs.timestamps.Timestamp'&gt;
  </code></pre>
  
  <p>wanted output </p>
  
  <pre><code>2018-12-01
  </code></pre>