title: Node cron, run every midnight
body: <p>I want to run cron job daily at midnight. For this I am using </p>
  
  <pre><code>0 0 0 1-31 * * 
  </code></pre>
  
  <p>but it doesn't work for me.
  I am using the  <a href="https://github.com/ncb000gt/node-cron" rel="noreferrer">node cron</a>. Please suggest the valid format.</p>