title: Get the average date from multiple dates - pandas
body: <p>DataFrame where Date is datetime: </p>
  
  <pre><code>   Column   |       Date             
  :-----------|----------------------:
      A       |   2018-08-05 17:06:01 
      A       |   2018-08-05 17:06:02 
      A       |   2018-08-05 17:06:03 
      B       |   2018-08-05 17:06:07 
      B       |   2018-08-05 17:06:09 
      B       |   2018-08-05 17:06:11 
  </code></pre>
  
  <p>Return Table is;</p>
  
  <pre><code>   Column   |       Date            
  :-----------|----------------------:
      A       |   2018-08-05 17:06:02 
      B       |   2018-08-05 17:06:09 
  </code></pre>