diff --git a/activesupport/lib/active_support/core_ext/time/conversions.rb b/activesupport/lib/active_support/core_ext/time/conversions.rb
index f42be46..e6f9134 100644
--- a/activesupport/lib/active_support/core_ext/time/conversions.rb
+++ b/activesupport/lib/active_support/core_ext/time/conversions.rb
@@ -10,7 +10,7 @@ module ActiveSupport #:nodoc:
           :short        => "%d %b %H:%M",
           :long         => "%B %d, %Y %H:%M",
           :long_ordinal => lambda { |time| time.strftime("%B #{time.day.ordinalize}, %Y %H:%M") },
-          :rfc822       => "%a, %d %b %Y %H:%M:%S %z"
+          :rfc822       => lambda { |time| time.strftime("%a, %d %b %Y %H:%M:%S #{time.formatted_offset(false)}") }
         }
 
         def self.included(base) #:nodoc:
diff --git a/activesupport/test/core_ext/time_ext_test.rb b/activesupport/test/core_ext/time_ext_test.rb
index 52d6c18..c085552 100644
--- a/activesupport/test/core_ext/time_ext_test.rb
+++ b/activesupport/test/core_ext/time_ext_test.rb
@@ -461,6 +461,10 @@ class TimeExtCalculationsTest < Test::Unit::TestCase
     with_env_tz "UTC" do
       assert_equal "Mon, 21 Feb 2005 17:44:30 +0000", time.to_s(:rfc822)
     end
+    with_env_tz "US/Central" do
+      assert_equal "Thu, 05 Feb 2009 14:30:05 -0600", Time.local(2009, 2, 5, 14, 30, 5).to_s(:rfc822)
+      assert_equal "Mon, 09 Jun 2008 04:05:01 -0500", Time.local(2008, 6, 9, 4, 5, 1).to_s(:rfc822)
+    end
   end
 
   def test_custom_date_format