diff --git a/django/forms/fields.py b/django/forms/fields.py
index 7711cd65ad..a794c02e9f 100644
--- a/django/forms/fields.py
+++ b/django/forms/fields.py
@@ -1025,7 +1025,7 @@ class MultiValueField(Field):
             if not isinstance(initial, list):
                 initial = self.widget.decompress(initial)
         for field, initial, data in zip(self.fields, initial, data):
-            if field._has_changed(initial, data):
+            if field._has_changed(field.to_python(initial), data):
                 return True
         return False
 
diff --git a/tests/forms_tests/tests/test_extra.py b/tests/forms_tests/tests/test_extra.py
index ea0f063c30..d439e2223c 100644
--- a/tests/forms_tests/tests/test_extra.py
+++ b/tests/forms_tests/tests/test_extra.py
@@ -391,7 +391,7 @@ class FormsExtraTestCase(TestCase, AssertFormErrorsMixin):
             def decompress(self, value):
                 if value:
                     data = value.split(',')
-                    return [data[0], data[1], datetime.datetime.strptime(data[2], "%Y-%m-%d %H:%M:%S")]
+                    return [data[0], list(data[1]), datetime.datetime.strptime(data[2], "%Y-%m-%d %H:%M:%S")]
                 return [None, None, None]
 
             def format_output(self, rendered_widgets):
diff --git a/tests/forms_tests/tests/test_fields.py b/tests/forms_tests/tests/test_fields.py
index dab67b4366..f02593e488 100644
--- a/tests/forms_tests/tests/test_fields.py
+++ b/tests/forms_tests/tests/test_fields.py
@@ -1247,6 +1247,7 @@ class FieldsTests(SimpleTestCase):
 
     def test_splitdatetimefield_changed(self):
         f = SplitDateTimeField(input_date_formats=['%d/%m/%Y'])
+        self.assertFalse(f._has_changed(['11/01/2012', '09:18:15'], ['11/01/2012', '09:18:15']))
         self.assertTrue(f._has_changed(datetime.datetime(2008, 5, 6, 12, 40, 00), ['2008-05-06', '12:40:00']))
         self.assertFalse(f._has_changed(datetime.datetime(2008, 5, 6, 12, 40, 00), ['06/05/2008', '12:40']))
         self.assertTrue(f._has_changed(datetime.datetime(2008, 5, 6, 12, 40, 00), ['06/05/2008', '12:41']))