diff --git a/lib/core_ext/date.rb b/lib/core_ext/date.rb
index 9bae8b6..4d760e6 100644
--- a/lib/core_ext/date.rb
+++ b/lib/core_ext/date.rb
@@ -14,8 +14,8 @@ def to_formatted_s(format = :default)
   alias_method :to_s, :to_formatted_s
 end
 
-::Date.const_set('DATE_FORMATS', {
+::Date.redef_without_warning :DATE_FORMATS, {
   :db           => "%Y-%m-%d",
   :number       => "%Y%m%d",
   :rfc822       => "%e %b %Y"
-})
\ No newline at end of file
+}
diff --git a/lib/core_ext/object.rb b/lib/core_ext/object.rb
new file mode 100644
index 0000000..da0a5e9
--- /dev/null
+++ b/lib/core_ext/object.rb
@@ -0,0 +1,7 @@
+class Object
+  def redef_without_warning(const, value)
+    mod = self.is_a?(Module) ? self : self.class
+    mod.send :remove_const, const
+    mod.const_set(const, value)
+  end
+end
diff --git a/lib/core_ext/time.rb b/lib/core_ext/time.rb
index 5467422..65fd8d4 100644
--- a/lib/core_ext/time.rb
+++ b/lib/core_ext/time.rb
@@ -14,24 +14,8 @@ def to_formatted_s(format = :default)
   alias_method :to_s, :to_formatted_s
 end
 
-class Object
-  def def_if_not_defined(const, value)
-    mod = self.is_a?(Module) ? self : self.class
-    mod.const_set(const, value) unless mod.const_defined?(const)
-  end
-
-  def redef_without_warning(const, value)
-    mod = self.is_a?(Module) ? self : self.class
-    if defined?(const.constantize) and mod.const_defined?(const)
-      mod.send(:remove_const, const)
-    else
-      mod.const_set(const, value)
-    end
-  end
-end
-
 ::Time.redef_without_warning :DATE_FORMATS, {
   :db           => "%Y-%m-%d %H:%M:%S",
   :number       => "%Y%m%d%H%M%S",
   :rfc822       => "%a, %d %b %Y %H:%M:%S %z"
-}
\ No newline at end of file
+}
diff --git a/lib/localized_dates.rb b/lib/localized_dates.rb
index a7f1483..e964f73 100644
--- a/lib/localized_dates.rb
+++ b/lib/localized_dates.rb
@@ -1,3 +1,4 @@
+require 'core_ext/object'
 require 'core_ext/date'
 require 'core_ext/datetime'
 require 'core_ext/time'