diff --git a/lib/validates_timeliness/multiparameter_attributes.rb b/lib/validates_timeliness/multiparameter_attributes.rb
index 348e0c3..435689f 100644
--- a/lib/validates_timeliness/multiparameter_attributes.rb
+++ b/lib/validates_timeliness/multiparameter_attributes.rb
@@ -1,33 +1,46 @@
 module ValidatesTimeliness
   module MultiparameterAttributes
     
-    def time_array_to_string(time_array)
-      "%04d-%02d-%02d %02d:%02d:%02d" % time_array
+    def self.included(base)
+      base.alias_method_chain :execute_callstack_for_multiparameter_attributes, :timeliness
+    end    
+        
+    def time_array_to_string(time_array, type)
+      case type
+        when :time
+          "%02d:%02d:%02d" % time_array[3..5]
+        when :date
+          "%04d-%02d-%02d" % time_array[0..2]
+        when :datetime
+          "%04d-%02d-%02d %02d:%02d:%02d" % time_array
+       end
     end
   
-    # Overrides AR method to store multiparameter time and dates as 
-    # ISO datetime string for later validation
-    def execute_callstack_for_multiparameter_attributes(callstack)
+    # Overrides AR method to store multiparameter time and dates as string
+    # allowing validation later.
+    def execute_callstack_for_multiparameter_attributes_with_timeliness(callstack)
       errors = []
       callstack.each do |name, values|
         klass = (self.class.reflect_on_aggregation(name.to_sym) || column_for_attribute(name)).klass
         if values.empty?
           send(name + "=", nil)
         else
+          column = column_for_attribute(name)
           begin
-            value = if Time == klass || Date == klass
-              time_array_to_string(values)
+            value = if [:date, :time, :datetime].include?(column.type)
+              time_array_to_string(values, column.type)
             else
-              klass.new(*values)              
+              klass.new(*values)
             end
-            send("#{name}=", value)
+            send(name + "=", value)
           rescue => ex
-            errors << AttributeAssignmentError.new("error on assignment #{values.inspect} to #{name}", ex, name)
+            errors << ActiveRecord::AttributeAssignmentError.new("error on assignment #{values.inspect} to #{name}", ex, name)
           end
         end
       end
       unless errors.empty?
-        raise MultiparameterAssignmentErrors.new(errors), "#{errors.size} error(s) on assignment of multiparameter attributes"
+        puts errors.inspect
+        raise ActiveRecord::MultiparameterAssignmentErrors.new(errors), "#{errors.size} error(s) on assignment of multiparameter attributes"
       end
     end
     
diff --git a/spec/multiparameter_attributes_spec.rb b/spec/multiparameter_attributes_spec.rb
index a866ac1..e4b0a25 100644
--- a/spec/multiparameter_attributes_spec.rb
+++ b/spec/multiparameter_attributes_spec.rb
@@ -1,37 +1,47 @@
 require File.dirname(__FILE__) + '/spec_helper'
 
 describe ValidatesTimeliness::MultiparameterAttributes do
-  include ValidatesTimeliness::MultiparameterAttributes
+  def obj
+    @obj ||= Person.new
+  end
 
-  class AttributeAssignmentError;       def initialize(*args); end; end
-  class MultiparameterAssignmentErrors; def initialize(*args); end; end
-
-  before do
-    self.class.stub!(:reflect_on_aggregation).and_return(nil)
-  end  
-
-  it "should convert time array into string" do
-    time_string = time_array_to_string([2000,2,1,9,10,11])
+  it "should convert array for datetime type into datetime string" do
+    time_string = obj.time_array_to_string([2000,2,1,9,10,11], :datetime)
     time_string.should == "2000-02-01 09:10:11"
   end
   
-  describe "execute_callstack_for_multiparameter_attributes" do 
-    before do
-      @date_array = [2000,2,1,9,10,11]
-    end
+  it "should convert array for date type into date string" do
+    time_string = obj.time_array_to_string([2000,2,1,0,0,0], :date)
+    time_string.should == "2000-02-01"
+  end
   
-    it "should store time string for a Time class column" do      
-      self.stub!(:column_for_attribute).and_return( mock('Column', :klass => Time) )
-      self.should_receive(:birth_date_and_time=).once.with("2000-02-01 09:10:11")
-      callstack = {'birth_date_and_time' => @date_array}
-      execute_callstack_for_multiparameter_attributes(callstack)
+  it "should convert array for time type into time string" do
+    time_string = obj.time_array_to_string([2000,1,1,9,10,11], :time)
+    time_string.should == "09:10:11"
+  end
+  
+  describe "execute_callstack_for_multiparameter_attributes" do 
+    before do      
+      @callstack = {
+        'birth_date_and_time' => [2000,2,1,9,10,11],
+        'birth_date' => [2000,2,1,9,10,11],
+        'birth_time' => [2000,2,1,9,10,11]
+      }
+    end
+    
+    it "should store datetime string for datetime column" do      
+      obj.should_receive(:birth_date_and_time=).once.with("2000-02-01 09:10:11")
+      obj.send(:execute_callstack_for_multiparameter_attributes, @callstack)
     end    
     
-    it "should store time string for a Date class column" do
-      self.stub!(:column_for_attribute).and_return( mock('Column', :klass => Date) )
-      self.should_receive(:birth_date=).once.with("2000-02-01 09:10:11")
-      callstack = {'birth_date' => @date_array}
-      execute_callstack_for_multiparameter_attributes(callstack)
+    it "should store date string for a date column" do
+      obj.should_receive(:birth_date=).once.with("2000-02-01")
+      obj.send(:execute_callstack_for_multiparameter_attributes, @callstack)
+    end
+    
+    it "should store time string for a time column" do
+      obj.should_receive(:birth_time=).once.with("09:10:11")
+      obj.send(:execute_callstack_for_multiparameter_attributes, @callstack)
     end
   end