title: Apscheduler cron to start on the half hour
body: <p>I’m looking to have a cron job that runs based on the stock market open and close times (8:30-3 CST). I want it to run every 15 minutes, starting at 8:30.</p>
  
  <p>What I currently have is </p>
  
  <pre><code>sched.add_job(scheduled_task,'cron',
     day_of_week='mon-fri', hour='8-15', 
     minute=enter code here'0-59/15', 
     timezone='America/Chicago')
  </code></pre>
  
  <p>This allows me to run 8am-3pm every 15 minutes which isn’t exactly what I want. I have also tried the following:</p>
  
  <pre><code>sched.add_job(scheduled_task,'cron',
     day_of_week='mon-fri', hour='12-20',     
     minute='30/15', 
     timezone='America/Chicago')
  </code></pre>
  
  <p>This gets me closer but only runs on the 30 and 45 minutes.</p>