Convert date extension modules to class reopens

activesupport/lib/active_support/core_ext/date.rb

 require 'active_support/core_ext/util'
 require 'date'
-ActiveSupport.core_ext Date, %w(behavior calculations conversions)
+require 'active_support/core_ext/date/acts_like'
+require 'active_support/core_ext/date/freeze'
+ActiveSupport.core_ext Date, %w(calculations conversions)

activesupport/lib/active_support/core_ext/date/acts_like.rb

+require 'date'
+
+class Date
+  # Enable more predictable duck-typing on Date-like classes. See
+  # Object#acts_like?.
+  def acts_like_date?
+    true
+  end
+end

activesupport/lib/active_support/core_ext/date/behavior.rb

-require 'date'
-
-module ActiveSupport #:nodoc:
-  module CoreExtensions #:nodoc:
-    module Date #:nodoc:
-      module Behavior
-        # Enable more predictable duck-typing on Date-like classes. See
-        # Object#acts_like?.
-        def acts_like_date?
-          true
-        end
-
-        # Date memoizes some instance methods using metaprogramming to wrap
-        # the methods with one that caches the result in an instance variable.
-        #
-        # If a Date is frozen but the memoized method hasn't been called, the
-        # first call will result in a frozen object error since the memo
-        # instance variable is uninitialized.
-        #
-        # Work around by eagerly memoizing before freezing.
-        #
-        # Ruby 1.9 uses a preinitialized instance variable so it's unaffected.
-        # This hack is as close as we can get to feature detection:
-        begin
-          ::Date.today.freeze.jd
-        rescue => frozen_object_error
-          if frozen_object_error.message =~ /frozen/
-            def freeze #:nodoc:
-              self.class.private_instance_methods(false).each do |m|
-                if m.to_s =~ /\A__\d+__\Z/
-                  instance_variable_set(:"@#{m}", [send(m)])
-                end
-              end
-
-              super
-            end
-          end
-        end
-      end
-    end
-  end
-end

activesupport/lib/active_support/core_ext/date/freeze.rb

+# Date memoizes some instance methods using metaprogramming to wrap
+# the methods with one that caches the result in an instance variable.
+#
+# If a Date is frozen but the memoized method hasn't been called, the
+# first call will result in a frozen object error since the memo
+# instance variable is uninitialized.
+#
+# Work around by eagerly memoizing before freezing.
+#
+# Ruby 1.9 uses a preinitialized instance variable so it's unaffected.
+# This hack is as close as we can get to feature detection:
+if RUBY_VERSION < '1.9'
+  require 'date'
+  begin
+    ::Date.today.freeze.jd
+  rescue => frozen_object_error
+    if frozen_object_error.message =~ /frozen/
+      class Date #:nodoc:
+        def freeze
+          self.class.private_instance_methods(false).each do |m|
+            if m.to_s =~ /\A__\d+__\Z/
+              instance_variable_set(:"@#{m}", [send(m)])
+            end
+          end
+
+          super
+        end
+      end
+    end
+  end
+end