>> TzTime.zone = TZInfo::Timezone._load('UTC')
=> #
>> TzTime.now
=> 2007-02-04 03:20:25 UTC
>> TzTime.at(Time.now)
=> 2007-02-03 21:20:31 UTC
>> Time.now
=> Sat Feb 03 21:20:47 -0600 2007