title: convert datetime to three letter month and year in R
body: <p>I need help to convert the first column of datetime in 3 letter month and year.</p>
  <p>DF&lt;-</p>
  <pre><code>Datetime              ID      Name
  2020-01-01 10:12:14   I-1     Rnad
  2020-01-01 16:32:43   I-2     Rnxa
  </code></pre>
  <p>Required output</p>
  <pre><code>Datetime              ID      Name   Month
  2020-01-01 10:12:14   I-1     Rnad   Jan-20
  2020-01-01 16:32:43   I-2     Rnxa   Jan-20
  </code></pre>