title: Dropping time from datetime <[M8] in Pandas
body: <p>So I have a 'Date' column in my data frame where the dates have the format like this</p>
  
  <pre><code>0    1998-08-26 04:00:00 
  </code></pre>
  
  <p>If I only want the Year month and day how do I drop the trivial hour?</p>