title: Does cron expression in unix/linux allow specifying exact start and end dates
body: <p>I want to be able to configure something like this.</p>
  
  <ol>
  <li>I want to run job 'X' at 7 AM everyday starting from 29/june/2009 till 30/12/2009. Consider current date as 4/4/2009.</li>
  </ol>