Setting an expiry date for published content

Sort of.  It is a stripped down version with a hard coded expiration date. I'll walk you through it line by line. 

var player = GetPlayer(); <-- this connects to the StoryLine player and suppoets the GetVar and SetVar functions of passing data back and forth between StoryLine and JavaScript

var currentDate = new Date(); <-- This gets the date and time from the computer

var expiryDate = new Date("January 25, 2016 13:00:00"); <-- This is the expiration date. In this example, the course expired years ago. Rather than hard code an expiration date like this buried in the JavaScript, I typically set it in StoryLine in a stored variable named something like "CourseExpiration".
***If you do this, the JavaScript needs to change to pull that date information as shown between the [] (which are NOT part of the code but are used here to separate the option. 
*** [var tempDate = player.GetVar("CourseExpiration");
       var expiryDate = new Date(tempDate); ]

  if(expiryDate < currentDate){
      var expiry = "True";
} else {
      expiry = "False";  <--These lines evaluate the dates. If the expiration date is before the current date, the course is expired and the variable will be set to True. Otherwise, it will be set to false.
}

player.SetVar("courseExpired", expiry); <-- this is the code to send the expiry status back to StoryLine.

Then, in Storyline, either let the user move forward in the course or jump them to an exit course slide based on the courseExpired variable value in StoryLine.