title: Quartz cron - what if the day of month does not exist?
body: <p>I'm trying to write a simple cron expression for quartz scheduler. I want the job to run every month on day 30 at 3am.</p>
  
  <pre><code>0 0 3 30 JAN-DEC ? *
  </code></pre>
  
  <p>I wonder what happens for the month of February? Will the job run or not run?</p>
  
  <p>I'm not looking for a last day of month solution, I need the user to select the day of month when the job will run (ideally once for all months).</p>