Use xmlschema when serializing TimeWithZones to xml [#2223 state:resolved]

When using Hash#to_xml, any TimeWithZone objects now use xmlschema (iso8601), rather than a simple TimeWithZone#to_s.
Signed-off-by: NPratik Naik <pratiknaik@gmail.com>

activesupport/lib/active_support/core_ext/hash/conversions.rb

@@ -24,11 +24,12 @@ def content_type
           "Bignum"     => "integer",
           "BigDecimal" => "decimal",
           "Float"      => "float",
+          "TrueClass"  => "boolean",
+          "FalseClass" => "boolean",
           "Date"       => "date",
           "DateTime"   => "datetime",
           "Time"       => "datetime",
-          "TrueClass"  => "boolean",
-          "FalseClass" => "boolean"
+          "ActiveSupport::TimeWithZone" => "datetime"
         } unless defined?(XML_TYPE_NAMES)
 
         XML_FORMATTING = {

activesupport/test/core_ext/hash_ext_test.rb

@@ -497,6 +497,15 @@ def test_three_levels_with_array
     assert xml.include?(%(<addresses type="array"><address><streets type="array"><street><name>))
   end
 
+  def test_timezoned_attributes
+    xml = {
+      :created_at => Time.utc(1999,2,2),
+      :local_created_at => Time.utc(1999,2,2).in_time_zone('Eastern Time (US & Canada)')
+    }.to_xml(@xml_options)
+    assert_match %r{<created-at type=\"datetime\">1999-02-02T00:00:00Z</created-at>}, xml
+    assert_match %r{<local-created-at type=\"datetime\">1999-02-01T19:00:00-05:00</local-created-at>}, xml
+  end
+
   def test_single_record_from_xml
     topic_xml = <<-EOT
       <topic>