title: Quartz: setting cron expression to run on the 1st and Last day of month
body: <p>Quartz documentation gives an example for running a cron job on the last day of every month, like this:</p>
  
  <pre>
  0 15 10 L * ?   
  </pre>
  
  <p>Fire at 10:15am on the last day of every month</p>
  
  <p>However, I'd like to run a cron job on the 1st AND Last day of the month.
  I would expect the cron would look somthing like this:</p>
  
  <pre>
  0 15 10 1,L * ?
  </pre>
  
  <p>But this syntax is not valid by quartz.</p>
  
  <p>I couldn't find any proper/similar example in their <a href="http://quartz-scheduler.org/documentation/quartz-2.1.x/tutorials/crontrigger" rel="nofollow">tutorial</a>. Any suggestions?</p>