diff --git a/lib/validates_timeliness/attribute_methods.rb b/lib/validates_timeliness/attribute_methods.rb
index 064c796..cba1fb0 100644
--- a/lib/validates_timeliness/attribute_methods.rb
+++ b/lib/validates_timeliness/attribute_methods.rb
@@ -35,7 +35,8 @@ module ValidatesTimeliness
           def #{attr_name}=(value)
             @timeliness_cache ||= {}
             @timeliness_cache["#{attr_name}"] = value
-            #{ timeliness_type_cast_code(attr_name) if ValidatesTimeliness.use_plugin_parser }
+
+            #{ "if value.is_a?(String)\n#{timeliness_type_cast_code(attr_name, 'value')}\nend" if ValidatesTimeliness.use_plugin_parser }
             super
           end
         EOV
@@ -51,11 +52,12 @@ module ValidatesTimeliness
         generated_timeliness_methods.module_eval(method_body, __FILE__, line)
       end
 
-      def timeliness_type_cast_code(attr_name)
+      def timeliness_type_cast_code(attr_name, var_name)
         type = timeliness_attribute_type(attr_name)
         timezone_aware = timeliness_attribute_timezone_aware?(attr_name)
+        timezone = :current if timezone_aware
 
-        "value = Timeliness::Parser.parse(value, :#{type}, :zone => (:current if #{timezone_aware})) if value.is_a?(String)"
+        "#{var_name} = Timeliness::Parser.parse(#{var_name}, :#{type}, :zone => #{timezone.inspect})"
       end
 
       def generated_timeliness_methods
diff --git a/lib/validates_timeliness/orm/active_record.rb b/lib/validates_timeliness/orm/active_record.rb
index 4029cc2..8309fb5 100644
--- a/lib/validates_timeliness/orm/active_record.rb
+++ b/lib/validates_timeliness/orm/active_record.rb
@@ -19,15 +19,12 @@ module ValidatesTimeliness
           columns_hash[attr_name.to_s].type
         end
 
-        def timeliness_type_cast_code(attr_name)
+        def timeliness_type_cast_code(attr_name, var_name)
           type = timeliness_attribute_type(attr_name)
-          timezone_aware = timeliness_attribute_timezone_aware?(attr_name)
 
           <<-END
-          if value.is_a?(String)
-            value = Timeliness::Parser.parse(value, :#{type}, :zone => (:current if #{timezone_aware}))
-            value = value.to_date if value && :#{type} == :date
-          end
+            #{super}
+            #{var_name} = #{var_name}.to_date if #{var_name} && :#{type} == :date
           END
         end
       end
diff --git a/lib/validates_timeliness/orm/mongoid.rb b/lib/validates_timeliness/orm/mongoid.rb
index 791e8f6..7b5b5b1 100644
--- a/lib/validates_timeliness/orm/mongoid.rb
+++ b/lib/validates_timeliness/orm/mongoid.rb
@@ -16,17 +16,10 @@ module ValidatesTimeliness
           attr_names.each { |attr_name| define_timeliness_write_method(attr_name) }
         end
 
-        def define_timeliness_write_method(attr_name)
+        def timeliness_type_cast_code(attr_name, var_name)
           type = timeliness_attribute_type(attr_name)
-          method_body, line = <<-EOV, __LINE__ + 1
-            def #{attr_name}=(value)
-              @timeliness_cache ||= {}
-              @timeliness_cache["#{attr_name}"] = value
-              #{ "value = Timeliness::Parser.parse(value, :#{type}) if value.is_a?(String)" if ValidatesTimeliness.use_plugin_parser }
-              write_attribute(:#{attr_name}, value)
-            end
-          EOV
-          class_eval(method_body, __FILE__, line)
+
+          "#{var_name} = Timeliness::Parser.parse(value, :#{type})"
         end
 
         def timeliness_attribute_type(attr_name)