title: Rails: How to get the current user's time zone when using Heroku
body: <p>I set the time zone of our site on Heroku to Pacific Standard Time (PST) using:</p>
  
  <pre><code>heroku config:add TZ=America/Los_Angeles
  </code></pre>
  
  <p>Times for users are now always in PST--whether or not they are in the PST time zone.</p>
  
  <p>What's the best way to get the user's actual time zone (i.e. the time zone of where they are physically located)?</p>
  
  <p>I'm guessing that this can be solved using Rails (or Javascript?), as opposed to Heroku.</p>