title: how to validate a cron expression using Later.js
body: <p>I want to validate a cron expression using javascript. Here is a library that deals with cron expression <a href="http://bunkat.github.io/later/" rel="nofollow">http://bunkat.github.io/later/</a></p>
  
  <p>From the documentation I am not able to found how to validate a cron expression. Whatever I am passing to <code>var cronSched = later.parse.cron('$%#');</code> Its always filling cronSched with an object. So How to get some true/false value for a cron expression?</p>