title: How to customize celery periodic task time interval?
body: <p>I need to run schedule every 30 minutes. And I have given cron  <code>as */30 * * *</code> and it has scheduling every 30 minutes as <br></p>
  
  <pre><code>00:30
  01:00
  01:30
  02:00
  02:30
  .
  .
  .
  00:00
  </code></pre>
  
  <p>But I want to customize the cron to schedule like<br></p>
  
  <pre><code>00:45        00:05       00:10
  01:15        00:35       00:40
  01:45        01:05       01:10
  02:15  (or)  01:35  (or) 01:40
  02:45        02:05       02:10
  .            .            .
  .            .            .
  .            .            .
  00:15        23:35       23:40
  </code></pre>
  
  <p>How can I give the cron tab to make schedule like this?</p>
  
  <p>I am using django and celery for this and using database scheduler.</p>
  
  <p><strong>PS:</strong> I want this to achieve only through cron but not by giving any time delay in the script. Is it possible?</p>