My app depends on
Mon Oct 31 2016 00:00:00 GMT-0400 (EDT)
Sun Oct 30 2016 20:00:00 GMT-0400 (EDT)
This is because the Heroku instance default timezone is UTC and your local machine will have your timezone.
Are you running this server-side (on node.js)? Or are you running this client-side? If you run it client-side it should detect your timezone.