diff --git a/CHANGELOG.rdoc b/CHANGELOG.rdoc
index 38b9f72..3617c43 100644
--- a/CHANGELOG.rdoc
+++ b/CHANGELOG.rdoc
@@ -1,6 +1,6 @@
 = [UNRELEASED]
-* Fix removed namespace ActionRecord::AttributeAssignment::MultiparameterAttribute (AquisTech)
 * Fix DateTimeSelect extension support (AquisTech)
+* Update Multiparameter extension to use ActiveRecord type classes with multiparameter handling
 
 = 4.0.2 [2016-01-07]
 * Fix undefine_generated_methods ivar guard setting to false
diff --git a/lib/validates_timeliness/extensions/multiparameter_handler.rb b/lib/validates_timeliness/extensions/multiparameter_handler.rb
index a18c2b2..4d05277 100644
--- a/lib/validates_timeliness/extensions/multiparameter_handler.rb
+++ b/lib/validates_timeliness/extensions/multiparameter_handler.rb
@@ -1,74 +1,55 @@
-ActiveRecord::AttributeAssignment.class_eval do
-  private
+module ValidatesTimeliness
+  module Extensions
+    class AcceptsMultiparameterTime < Module
 
-  # Yield if date values are valid
-  def validate_multiparameter_date_values(set_values)
-    if set_values[0..2].all?{ |v| v.present? } && Date.valid_civil?(*set_values[0..2])
-      yield
-    else
-      invalid_multiparameter_date_or_time_as_string(set_values)
-    end
-  end
+      def initialize(defaults: {})
 
-  def invalid_multiparameter_date_or_time_as_string(values)
-    value =  [values[0], *values[1..2].map {|s| s.to_s.rjust(2,"0")} ].join("-")
-    value += ' ' + values[3..5].map {|s| s.to_s.rjust(2, "0") }.join(":") unless values[3..5].empty?
-    value
-  end
+        define_method(:cast) do |value|
+          if value.is_a?(Hash)
+            value_from_multiparameter_assignment(value)
+          else
+            super(value)
+          end
+        end
 
-  def instantiate_time_object(set_values)
-    raise if set_values.any?(&:nil?)
+        define_method(:assert_valid_value) do |value|
+          if value.is_a?(Hash)
+            value_from_multiparameter_assignment(value)
+          else
+            super(value)
+          end
+        end
 
-    validate_multiparameter_date_values(set_values) {
-      set_values = set_values.map {|v| v.is_a?(String) ? v.strip : v }
+        define_method(:value_from_multiparameter_assignment) do |values_hash|
+          defaults.each do |k, v|
+            values_hash[k] ||= v
+          end
+          return unless values_hash.values_at(1,2,3).all?{ |v| v.present? } &&
+                          Date.valid_civil?(*values_hash.values_at(1,2,3))
+
+          values = values_hash.sort.map(&:last)
+          ::Time.send(default_timezone, *values)
+        end
+        private :value_from_multiparameter_assignment
 
-      if object.class.send(:create_time_zone_conversion_attribute?, name, cast_type_or_column)
-        Time.zone.local(*set_values)
-      else
-        Time.send(object.class.default_timezone, *set_values)
       end
-    }
-  rescue
-    invalid_multiparameter_date_or_time_as_string(set_values)
-  end
 
-  def read_time
-    # If column is a :time (and not :date or :timestamp) there is no need to validate if
-    # there are year/month/day fields
-    if cast_type_or_column.type == :time
-      # if the column is a time set the values to their defaults as January 1, 1970, but only if they're nil
-      { 1 => 1970, 2 => 1, 3 => 1 }.each do |key,value|
-        values[key] ||= value
-      end
     end
-
-    max_position = extract_max_param(6)
-    set_values   = values.values_at(*(1..max_position))
-
-    instantiate_time_object(set_values)
   end
-
-  def read_date
-    set_values = values.values_at(1,2,3).map {|v| v.is_a?(String) ? v.strip : v }
-    
-    if set_values.any? { |v| v.is_a?(String) }
-      Timeliness.parse(set_values.join('-'), :date).try(:to_date) or raise TypeError
-    else
-      Date.new(*set_values)
-    end
-  rescue TypeError, ArgumentError, NoMethodError => ex # if Date.new raises an exception on an invalid date
-    # Date.new with nil values throws NoMethodError
-    raise ex if ex.is_a?(NoMethodError) && ex.message !~ /undefined method `div' for/
-    invalid_multiparameter_date_or_time_as_string(set_values)
-  end
-
-  # Cast type is v4.2 and column before
-  def cast_type_or_column
-    @cast_type || @column
-  end
-
-  def timezone_conversion_attribute?
-    object.class.send(:create_time_zone_conversion_attribute?, name, column)
-  end
-
 end
+
+ActiveModel::Type::Date.class_eval do
+  include ValidatesTimeliness::Extensions::AcceptsMultiparameterTime.new
+end
+
+ActiveModel::Type::Time.class_eval do
+  include ValidatesTimeliness::Extensions::AcceptsMultiparameterTime.new(
+    defaults: { 1 => 1970, 2 => 1, 3 => 1, 4 => 0, 5 => 0 }
+  )
+end
+
+ActiveModel::Type::DateTime.class_eval do
+  include ValidatesTimeliness::Extensions::AcceptsMultiparameterTime.new(
+    defaults: { 4 => 0, 5 => 0 }
+  )
+end
\ No newline at end of file
diff --git a/spec/spec_helper.rb b/spec/spec_helper.rb
index a75afd2..a416626 100644
--- a/spec/spec_helper.rb
+++ b/spec/spec_helper.rb
@@ -57,6 +57,7 @@ end
 ActiveRecord::Base.default_timezone = :utc
 ActiveRecord::Base.time_zone_aware_attributes = true
 ActiveRecord::Base.establish_connection({:adapter => 'sqlite3', :database => ':memory:'})
+ActiveRecord::Base.time_zone_aware_types = [:datetime, :time]
 ActiveRecord::Migration.verbose = false
 ActiveRecord::Schema.define(:version => 1) do
   create_table :employees, :force => true do |t|
diff --git a/spec/validates_timeliness/extensions/multiparameter_handler_spec.rb b/spec/validates_timeliness/extensions/multiparameter_handler_spec.rb
index f4a914d..7a5210f 100644
--- a/spec/validates_timeliness/extensions/multiparameter_handler_spec.rb
+++ b/spec/validates_timeliness/extensions/multiparameter_handler_spec.rb
@@ -1,36 +1,36 @@
 RSpec.describe 'ValidatesTimeliness::Extensions::MultiparameterHandler' do
 
   context "time column" do
-    it 'should assign a string value for invalid date portion' do
+    it 'should be nil invalid date portion' do
       employee = record_with_multiparameter_attribute(:birth_datetime, [2000, 2, 31, 12, 0, 0])
-      expect(employee.birth_datetime_before_type_cast).to eq '2000-02-31 12:00:00'
+      expect(employee.birth_datetime).to be_nil
     end
      
     it 'should assign a Time value for valid datetimes' do
       employee = record_with_multiparameter_attribute(:birth_datetime, [2000, 2, 28, 12, 0, 0])
-      expect(employee.birth_datetime_before_type_cast).to eq Time.zone.local(2000, 2, 28, 12, 0, 0)
+      expect(employee.birth_datetime).to eq Time.zone.local(2000, 2, 28, 12, 0, 0)
     end
 
-    it 'should assign a string value for incomplete time' do
+    it 'should be nil for incomplete date portion' do
       employee = record_with_multiparameter_attribute(:birth_datetime, [2000, nil, nil])
-      expect(employee.birth_datetime_before_type_cast).to eq '2000-00-00'
+      expect(employee.birth_datetime).to be_nil
     end
   end
 
   context "date column" do
-    it 'should assign a string value for invalid date' do
+    it 'should assign nil for invalid date' do
       employee = record_with_multiparameter_attribute(:birth_date, [2000, 2, 31])
-      expect(employee.birth_date_before_type_cast).to eq '2000-02-31'
+      expect(employee.birth_date).to be_nil
     end
 
     it 'should assign a Date value for valid date' do
       employee = record_with_multiparameter_attribute(:birth_date, [2000, 2, 28])
-      expect(employee.birth_date_before_type_cast).to eq Date.new(2000, 2, 28)
+      expect(employee.birth_date).to eq Date.new(2000, 2, 28)
     end
 
-    it 'should assign a string value for incomplete date' do
+    it 'should assign hash values for incomplete date' do
       employee = record_with_multiparameter_attribute(:birth_date, [2000, nil, nil])
-      expect(employee.birth_date_before_type_cast).to eq '2000-00-00'
+      expect(employee.birth_date).to be_nil
     end
   end