title: Cron expression for daily start at 09.30 AM with 30 minute interval
body: <p>I want my schedule job to run daily between specific time and at spefic interval.</p>
  
  <p>For example interval of 30 minute starting from 09.30AM to 11.30PM. </p>
  
  <p>Start time, end time and interval will be configurable
  at run time.</p>
  
  <p>I tried with following cron expression :
  0 30/30 09-23 1/1 * ?</p>
  
  <p>But this runs at every hour instead of every 30 minutes.</p>
  
  <p>If not possible with cronexpression then appreciate any way of doing it with java.</p>
  
  <p>Note: start time, end time and interval must be configurable at run time</p>