title: How to execute a function every n hours in server side swift?
body: <p>I'm looking for a Swift counterpart to Django's <a href="http://www.celeryproject.org/" rel="noreferrer">Celery</a> which allows a function to execute every given amount of time. </p>
  
  <p>I need a solution that works on server side Swift, meaning not all of Foundation is available, and something that's not for iOS / Mac. </p>
  
  <p>I am using the Vapor framework.</p>