title: Generate crontab for odd time intervals
body: <p>I am planning to monitor some values in a system between time intervals. I am implementing quartz scheduler. I wanted to understand how to generate crontab which will have the following attributes:</p>
  
  <ol>
  <li>Runs between 9:45- 12:30</li>
  <li>Interval - 15 mins</li>
  <li>Weekdays</li>
  </ol>
  
  <p>The closest I was able to get was</p>
  
  <pre><code>0/45 9-12 * * Mon-Fri
  </code></pre>
  
  <p>which is roughly “At every 0 and 45th minute past the 9, 10, 11 and 12th hour on Mon, Tue, Wed, Thu and Fri.”</p>