title: How do you schedule cron jobs for multiple dates?
body: <p>I would like to know if this is correct.</p>
  
  <p>I want to schedule a cron job for multiple dates such as:</p>
  
  <ul>
  <li>7 Dec 2016</li>
  <li>14 Jan 2017</li>
  <li>21 Feb 2017</li>
  </ul>
  
  <p><code>30 9 7,14,21 12,1,2 * my_awesome_script...</code></p>
  
  <p>While I could wait for the next date to see if it works...I just don't want to :)</p>