Allow to opt-in to the new TimeWithZone.name and fix XmlMini serialization

activesupport/lib/active_support/railtie.rb

@@ -9,6 +9,13 @@ module ActiveSupport
 
     config.eager_load_namespaces << ActiveSupport
 
+    initializer "active_support.remove_deprecated_time_with_zone_name" do |app|
+      if app.config.active_support.remove_deprecated_time_with_zone_name
+        require "active_support/time_with_zone"
+        TimeWithZone.singleton_class.remove_method(:name)
+      end
+    end
+
     initializer "active_support.set_authenticated_message_encryption" do |app|
       config.after_initialize do
         unless app.config.active_support.use_authenticated_message_encryption.nil?

activesupport/lib/active_support/time_with_zone.rb

@@ -45,6 +45,8 @@ module ActiveSupport
       ActiveSupport::Deprecation.warn(<<~EOM)
         ActiveSupport::TimeWithZone.name has been deprecated and
         from Rails 7.1 will use the default Ruby implementation.
+        You can set `config.active_support.remove_deprecated_time_with_zone_name = true`
+        to enable thew new behavior now.
       EOM
 
       "Time"

activesupport/lib/active_support/xml_mini.rb

@@ -50,6 +50,7 @@ module ActiveSupport
         "Hash"       => "hash"
       }
     end
+    TYPE_NAMES["ActiveSupport::TimeWithZone"] = TYPE_NAMES["Time"]
 
     FORMATTING = {
       "symbol"   => Proc.new { |symbol| symbol.to_s },

activesupport/test/xml_mini_test.rb

@@ -134,6 +134,14 @@ module XmlMiniTest
       assert_xml("<b type=\"dateTime\">1993-02-24T12:00:00+09:00</b>")
     end
 
+    test "#to_tag accepts ActiveSupport::TimeWithZone types" do
+      time = ActiveSupport::TimeWithZone.new(Time.new(1993, 02, 24, 12, 0, 0, "+09:00"), ActiveSupport::TimeZone["Europe/Paris"])
+      ActiveSupport::TimeWithZone.stub(:name, "ActiveSupport::TimeWithZone") do
+        @xml.to_tag(:b, time, @options)
+        assert_xml("<b type=\"dateTime\">1993-02-24T13:00:00+01:00</b>")
+      end
+    end
+
     test "#to_tag accepts array types" do
       @xml.to_tag(:b, ["first_name", "last_name"], @options)
       assert_xml("<b type=\"array\"><b>first_name</b><b>last_name</b></b>")

railties/lib/rails/application/configuration.rb

@@ -209,6 +209,7 @@ module Rails
           if respond_to?(:active_support)
             active_support.hash_digest_class = OpenSSL::Digest::SHA256
             active_support.key_generator_hash_digest_class = OpenSSL::Digest::SHA256
+            active_support.remove_deprecated_time_with_zone_name = true
           end
         else
           raise "Unknown version #{target_version.to_s.inspect}"