title: Specify arbitrary start and end times for cron job
body: <p>For Quartz Cron, is it possible at all to specify a cronexpression that corresponds to:</p>
  
  <p><code>Run every 6 minutes, starting from 9:12 AM until 5:37 PM.</code></p>
  
  <p>I attempted to write the cronexpression <code>0 12-37/6 9-17 ? * *</code> but this does only runs once an hour. I also <a href="http://www.cronmaker.com/">understand</a> that the cronexpression <code>0 /6 9-17 ? * *</code> corresponds to <code>Run every 6 minutes between the hours of 9 AM and 5 PM</code>.</p>
  
  <p>But is there any way to constrain the starting and ending minutes on that cronexpression? More generally, can I specify an arbitrary start and end time with the job in question running every <code>n</code> intervals of time? </p>