title: Default TimeZone with ActiveSupport (without Rails)
body: <p>How does the default TimeZone get set in ActiveSupport?</p>
  
  <p>Here's what's happening:</p>
  
  <pre><code>irb -r 'rubygems'
  ruby-1.8.7-p174 &gt; require 'active_support' 
  ruby-1.8.7-p174 &gt; require 'active_support/time_with_zone'
  ruby-1.8.7-p174 &gt; Time.zone
  ruby-1.8.7-p174 &gt; nil
  </code></pre>
  
  <p>How do I set that to the current location by default?</p>