ActiveSupport、Time.zone=
>> require "rubygems" => true >> require "active_support" => true >> Time.zone => nil >> Time.zone = "Hawaii" => "Hawaii" >> Time.zone => #<ActiveSupport::TimeZone:0x406aa8fc @name="Hawaii", @tzinfo=nil, @utc_offset=-36000>
>> require "rubygems" => true >> require "active_support" => true >> Time.zone => nil >> Time.zone = "Hawaii" => "Hawaii" >> Time.zone => #<ActiveSupport::TimeZone:0x406aa8fc @name="Hawaii", @tzinfo=nil, @utc_offset=-36000>