Set the default timezone after the initialization since the configura…

…tion

now lives in the application initializers.

Fix #8711

activesupport/lib/active_support/railtie.rb

@@ -13,20 +13,6 @@ class Railtie < Rails::Railtie # :nodoc:
       end
     end
 
-    # Sets the default value for Time.zone
-    # If assigned value cannot be matched to a TimeZone, an exception will be raised.
-    initializer "active_support.initialize_time_zone" do |app|
-      require 'active_support/core_ext/time/zones'
-      zone_default = Time.find_zone!(app.config.time_zone)
-
-      unless zone_default
-        raise 'Value assigned to config.time_zone not recognized. ' \
-          'Run "rake -D time" for a list of tasks for finding appropriate time zone names.'
-      end
-
-      Time.zone_default = zone_default
-    end
-
     # Sets the default week start
     # If assigned value is not a valid day symbol (e.g. :sunday, :monday, ...), an exception will be raised.
     initializer "active_support.initialize_beginning_of_week" do |app|
@@ -42,5 +28,21 @@ class Railtie < Rails::Railtie # :nodoc:
         ActiveSupport.send(k, v) if ActiveSupport.respond_to? k
       end
     end
+
+    # Sets the default value for Time.zone after initialization since the default configuration
+    # lives in application initializers.
+    # If assigned value cannot be matched to a TimeZone, an exception will be raised.
+    config.after_initialize do |app|
+      require 'active_support/core_ext/time/zones'
+      zone_default = Time.find_zone!(app.config.time_zone)
+
+      unless zone_default
+        raise 'Value assigned to config.time_zone not recognized. ' \
+          'Run "rake -D time" for a list of tasks for finding appropriate time zone names.'
+      end
+
+      Time.zone_default = zone_default
+    end
+
   end
 end

railties/test/application/configuration_test.rb

@@ -407,7 +407,17 @@ def index
 
       require "#{app_path}/config/environment"
 
-      assert_equal "Wellington", Rails.application.config.time_zone
+      assert_equal Time.find_zone!("Wellington"), Time.zone_default
+    end
+
+    test "timezone can be set on initializers" do
+      app_file "config/initializers/locale.rb", <<-RUBY
+        Rails.application.config.time_zone = "Central Time (US & Canada)"
+      RUBY
+
+      require "#{app_path}/config/environment"
+
+      assert_equal Time.find_zone!("Central Time (US & Canada)"), Time.zone_default
     end
 
     test "raises when an invalid timezone is defined in the config" do