diff --git a/activesupport/CHANGELOG b/activesupport/CHANGELOG
index cc79c9d7c4280928f8fd216c78d0e2d842227df2..3ddfc19643c8d7df4482c15a335b2969ee00431d 100644
--- a/activesupport/CHANGELOG
+++ b/activesupport/CHANGELOG
@@ -1,5 +1,7 @@
 *SVN*
 
+* DateTime#to_time gives hour/minute/second resolution.  #5747 [jon.evans@pobox.com]
+
 * attr_internal to support namespacing and deprecation. Like attr_* except backed by internally-named instance variable. Set attr_internal_naming_format to change the format from the default '@_%s'. [Jeremy Kemper]
     # def foo()   @foo__rofl      end
     # def foo=(v) @foo__rofl = v  end
diff --git a/activesupport/lib/active_support/core_ext/date/conversions.rb b/activesupport/lib/active_support/core_ext/date/conversions.rb
index bae20c66db8bb8886ccf078588d40b94c2b9c4be..4b9388dacd6ea020f1672f7d7b7b298d6d2b0c48 100644
--- a/activesupport/lib/active_support/core_ext/date/conversions.rb
+++ b/activesupport/lib/active_support/core_ext/date/conversions.rb
@@ -7,14 +7,14 @@ module Conversions
           :short => "%e %b",
           :long  => "%B %e, %Y"
         }
-        
+
         def self.included(klass) #:nodoc:
           klass.send(:alias_method, :to_default_s, :to_s)
           klass.send(:alias_method, :to_s, :to_formatted_s)
         end
-        
+
         def to_formatted_s(format = :default)
-          DATE_FORMATS[format] ? strftime(DATE_FORMATS[format]).strip : to_default_s   
+          DATE_FORMATS[format] ? strftime(DATE_FORMATS[format]).strip : to_default_s
         end
 
         # To be able to keep Dates and Times interchangeable on conversions
@@ -23,7 +23,11 @@ def to_date
         end
 
         def to_time(form = :local)
-          ::Time.send(form, year, month, day)
+          if respond_to?(:hour)
+            ::Time.send(form, year, month, day, hour, min, sec)
+          else
+            ::Time.send(form, year, month, day)
+          end
         end
 
         def xmlschema
diff --git a/activesupport/test/core_ext/date_ext_test.rb b/activesupport/test/core_ext/date_ext_test.rb
index 71c2ed1f3a524cd9fe9ad84dcadacb8460e7930a..56161954a067a8e7a13a528a04df9a499d32aec1 100644
--- a/activesupport/test/core_ext/date_ext_test.rb
+++ b/activesupport/test/core_ext/date_ext_test.rb
@@ -10,6 +10,10 @@ def test_to_time
     assert_equal Time.local(2005, 2, 21), Date.new(2005, 2, 21).to_time
   end
 
+  def test_to_time_on_datetime
+    assert_equal Time.local(2005, 2, 21, 10, 11, 12), DateTime.new(2005, 2, 21, 10, 11, 12).to_time
+  end
+
   def test_to_date
     assert_equal Date.new(2005, 2, 21), Date.new(2005, 2, 21).to_date
   end