title: Cron job start and stop at certain time
body: <p>Is it possible to setup a cron job to work on certain days only at night, for example, the first day of each month from 03pm to 09pm?</p>
  
  <p>I want to do an email campaign only at night when the server load is low.</p>
  
  <p>Is it possible to run a cron job at a certain time and stop it at a certain time?</p>