ruby script/plugin install http://dev.rubyonrails.com/svn/rails/plugins/tztime/

TzTime is subversive. It even _sounds_ subversive, like sharp incisors snicking together in the dark. It sneaks into your app from the inside and stuffs time zone support into the cracks. It's like a little ruby-colored rat, poking around in the under-basement of your code, but instead of chewing away at the infrastructure with its sharp little teeth (and believe me, they _are_ sharp), it builds fluffy (and oh, so comfortable!) little time-zone flavored nests wherever it can.

This look familiar?

  class TasksController < ApplicationController
    def create
      task = account.tasks.build(params[:task])
      task.alert_at = current_user.time_zone.local_to_utc(task.alert_at)
      task.save!
    end
  end

Oh, that awful bloating sensation! Because the time zone is not globally accessible, you have to jump through hoop and ungainly hoop in your controllers...or pass the unfortunate time zone to method after method.

No more! Let the Rodent of Unusually Fine TZ Acumen aid you:

  class ApplicationController < ActionController:Base
    around_filter :set_timezone

    private

      def set_timezone
        TzTime.zone = current_user.time_zone
        yield
        TzTime.reset!
      end
  end

  class Task < ActiveRecord::Base
    tz_time_attributes :alert_at
  end

  class TasksController < ApplicationController
    def create
      task = account.tasks.create(params[:task])
    end
  end

There is currently no advanced documentation for this plugin.