title: Scheduled jenkins build to run only when change is detected
body: <p>I am familiar with running jenkins build by doing a poll on git repository.</p>
  
  <p>But my question is, I have automated builds that are scheduled to run at some specific time. If there are no changes I would like to not trigger the scheduled build. </p>
  
  <p>Any suggestions please let me know.</p>
  
  <p>Thanks.</p>