title: Rails time_zone_select dropdown shows GMT instead of UTC
body: <p>I created a model with time:time and time_zone:string. Specifically, I created using:</p>
  
  <pre><code>rails generate scaffold Alarm time:time time_zone:string
  </code></pre>
  
  <p>And I created a form as follows:</p>
  
  <pre><code>&lt;%= form_for(@alarm) do |f| %&gt;
    &lt;div class="field"&gt;
      &lt;%= f.label :time %&gt;&lt;br /&gt;
      &lt;%= f.time_select :time %&gt;
    &lt;/div&gt;
    &lt;div class="field"&gt;
      &lt;%= f.label :time_zone %&gt;&lt;br /&gt;
      &lt;%= f.time_zone_select :time_zone,
          ActiveSupport::TimeZone.us_zones,
          default: "Pacific Time (US &amp; Canada)" %&gt;
    &lt;/div&gt;
  &lt;% end %&gt;
  </code></pre>
  
  <p>When I see the form, time_zone_select shows a dropdown containing bunch of time zones in GMT not in UTC (e.g. "(GMT-08:00) Pacific Time").</p>
  
  <p>I thought by default, the time zones are shown in UTC. How do I make it show in UTC (e.g. (UTC-08:00) Pacific Time) instead?</p>
  
  <p>This is a fresh project and I didn't touch any configuration file.</p>
  
  <p>And I'm using ruby-1.9.3-p0, rails 3.2.6 and pg 0.13.2.</p>
  
  <p>Thanks in advance!</p>