Heroku uses UTC by default. To change this, set your preferred timezone using the TZ Database Timezone format (http://en.wikipedia.org/wiki/List_of_tz_database_time_zones)
For example, for Pacific Time:
$ heroku config:add TZ="America/Los_Angeles"
Credit to http://blog.pardner.com/2012/08/setting-the-default-time-zone-for-a-heroku-app/
Thanks for this. I can set to my local timezone but does that mean people in a different timezones will be off? Do you know how we set it so the Date will read whatever local timezone of the user?