How does the default TimeZone get set in ActiveSupport?

Here's what's happening:

irb -r 'rubygems'
ruby-1.8.7-p174 > require 'active_support' 
ruby-1.8.7-p174 > require 'active_support/time_with_zone'
ruby-1.8.7-p174 > Time.zone
ruby-1.8.7-p174 > nil

How do I set that to the current location by default?

ruby timezone activesupport
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