title: Tiimestamp conversion to dataframe with dates
body: <p>I'm a new python user with Jupiter notebooks.</p>
  <p>I have that :</p>
  <pre><code>[Timestamp('2022-01-14 00:00:00', freq='D'),
   Timestamp('2022-02-12 00:00:00', freq='D'),
   Timestamp('2022-02-13 00:00:00', freq='D')]
  </code></pre>
  <p>And I would like to have a dataframe with only date XXXX-XX-XX with this type : datetime64[ns] to use with plotly.</p>
  <p>Could you tell me how to do that ?
  Thank you</p>