Allow utc_to_local_returns_utc_offset_times to be set in new_framework_defaults_6_1.rb

Enabling this option in new_framework_defaults_6_1.rb didn't work
before, as railtie initializers run before application initializers.

activesupport/CHANGELOG.md

@@ -18,7 +18,7 @@
 
     This changes the output of `ActiveSupport::TimeZone.utc_to_local`, but
     can be controlled with the
-    `Rails.application.config.active_support.utc_to_local_returns_utc_offset_times` config.
+    `ActiveSupport.utc_to_local_returns_utc_offset_times` config.
 
     New Rails 6.1 apps have it enabled by default, existing apps can upgrade
     via the config in config/initializers/new_framework_defaults_6_1.rb

railties/lib/rails/application/configuration.rb

@@ -179,9 +179,7 @@ def load_defaults(target_version)
             action_dispatch.cookies_same_site_protection = :lax
           end
 
-          if respond_to?(:active_support)
-            active_support.utc_to_local_returns_utc_offset_times = true
-          end
+          ActiveSupport.utc_to_local_returns_utc_offset_times = true
         else
           raise "Unknown version #{target_version.to_s.inspect}"
         end

railties/lib/rails/generators/rails/app/templates/config/initializers/new_framework_defaults_6_1.rb.tt

@@ -24,4 +24,4 @@
 
 # Specify whether `ActiveSupport::TimeZone.utc_to_local` returns a time with an
 # UTC offset or a UTC time.
-# Rails.application.config.active_support.utc_to_local_returns_utc_offset_times = true
+# ActiveSupport.utc_to_local_returns_utc_offset_times = true

railties/test/application/configuration_test.rb

@@ -2295,13 +2295,35 @@ class ::DummySerializer < ActiveJob::Serializers::ObjectSerializer; end
       assert_equal :lax, Rails.application.config.action_dispatch.cookies_same_site_protection
     end
 
-    test "enables utc_to_local_returns_utc_offset_times by default" do
+    test "ActiveSupport.utc_to_local_returns_utc_offset_times is true in 6.1 defaults" do
       remove_from_config '.*config\.load_defaults.*\n'
       add_to_config 'config.load_defaults "6.1"'
 
       app "development"
 
-      assert_equal true, Rails.application.config.active_support.utc_to_local_returns_utc_offset_times
+      assert_equal true, ActiveSupport.utc_to_local_returns_utc_offset_times
+    end
+
+    test "ActiveSupport.utc_to_local_returns_utc_offset_times is false in 6.0 defaults" do
+      remove_from_config '.*config\.load_defaults.*\n'
+      add_to_config 'config.load_defaults "6.0"'
+
+      app "development"
+
+      assert_equal false, ActiveSupport.utc_to_local_returns_utc_offset_times
+    end
+
+    test "ActiveSupport.utc_to_local_returns_utc_offset_times can be configured in an initializer" do
+      remove_from_config '.*config\.load_defaults.*\n'
+      add_to_config 'config.load_defaults "6.0"'
+
+      app_file "config/initializers/new_framework_defaults_6_1.rb", <<-RUBY
+        ActiveSupport.utc_to_local_returns_utc_offset_times = true
+      RUBY
+
+      app "development"
+
+      assert_equal true, ActiveSupport.utc_to_local_returns_utc_offset_times
     end
 
     test "ActiveStorage.queues[:analysis] is :active_storage_analysis by default" do