showing time in different time zones

application.rb

module Blahapp
  class Application < Rails::Application
    # Set Time.zone default to the specified zone and make Active Record auto-convert to this zone.
    # Run "rake -D time" for a list of tasks for finding time zone names. Default is UTC.
    config.time_zone = 'Central Time (US & Canada)'
  end
end

gistfile1.txt

$ bin/rails c
Loading development environment (Rails 4.1.6)
[1] pry(main)> show-models
TimeTest
  id: integer
  whats_at: datetime
  created_at: datetime
  updated_at: datetime
[2] pry(main)> TimeTest.find(1).attributes
  TimeTest Load (0.2ms)  SELECT  "time_tests".* FROM "time_tests"  WHERE "time_tests"."id" = ? LIMIT 1  [["id", 1]]
=> {"id"=>1,
 "whats_at"=>Wed, 12 Nov 2014 05:41:11 CST -06:00,
 "created_at"=>Wed, 12 Nov 2014 05:41:11 CST -06:00,
 "updated_at"=>Wed, 12 Nov 2014 05:41:11 CST -06:00}
[3] pry(main)> TimeTest.find(1).whats_at
  TimeTest Load (0.3ms)  SELECT  "time_tests".* FROM "time_tests"  WHERE "time_tests"."id" = ? LIMIT 1  [["id", 1]]
=> Wed, 12 Nov 2014 05:41:11 CST -06:00
[4] pry(main)> TimeTest.find(1).whats_at.utc
  TimeTest Load (0.1ms)  SELECT  "time_tests".* FROM "time_tests"  WHERE "time_tests"."id" = ? LIMIT 1  [["id", 1]]
=> 2014-11-12 11:41:11 UTC


[6] pry(main)> TimeTest.find(1).whats_at.in_time_zone
  TimeTest Load (0.2ms)  SELECT  "time_tests".* FROM "time_tests"  WHERE "time_tests"."id" = ? LIMIT 1  [["id", 1]]
=> Wed, 12 Nov 2014 05:41:11 CST -06:00
[7] pry(main)> TimeTest.find(1).whats_at.in_time_zone('EST')
  TimeTest Load (0.2ms)  SELECT  "time_tests".* FROM "time_tests"  WHERE "time_tests"."id" = ? LIMIT 1  [["id", 1]]
=> Wed, 12 Nov 2014 06:41:11 EST -05:00
[8] pry(main)> TimeTest.find(1).whats_at.in_time_zone('Pretoria')
  TimeTest Load (0.2ms)  SELECT  "time_tests".* FROM "time_tests"  WHERE "time_tests"."id" = ? LIMIT 1  [["id", 1]]
=> Wed, 12 Nov 2014 13:41:11 SAST +02:00
[9] pry(main)>