This website simply states "yes" or "no" if it is or past a certain date and has no other functionality.

• Download the repository
• Open up the script.js file in your editor of choice
• On the second line modify the enddate to a date of your choice.
• format:

var enddate = new Date("[Month] [Day], [Year] [Hours]:[Minutes]:[Seconds]");

• Example:

var enddate = new Date(" July 11, 2016 13:33:00");