diff --git a/django/forms/widgets.py b/django/forms/widgets.py
index 95c42ea055..c7bb1cbe9a 100644
--- a/django/forms/widgets.py
+++ b/django/forms/widgets.py
@@ -16,7 +16,8 @@ from django.utils.translation import ugettext
 from django.utils.encoding import StrAndUnicode, force_unicode
 from django.utils.safestring import mark_safe
 from django.utils import datetime_safe
-from datetime import time
+import time
+import datetime
 from util import flatatt
 from urlparse import urljoin
 
@@ -319,6 +320,14 @@ class DateInput(Input):
         return super(DateInput, self).render(name, value, attrs)
 
     def _has_changed(self, initial, data):
+        # If our field has show_hidden_initial=True, initial will be a string
+        # formatted by HiddenInput using formats.localize_input, which is not
+        # necessarily the format used for this widget. Attempt to convert it.
+        try:
+            input_format = '%Y-%m-%d'
+            initial = datetime.date(*time.strptime(initial, '%Y-%m-%d')[:3])
+        except (TypeError, ValueError):
+            pass
         return super(DateInput, self)._has_changed(self._format_value(initial), data)
 
 class DateTimeInput(Input):
@@ -343,6 +352,14 @@ class DateTimeInput(Input):
         return super(DateTimeInput, self).render(name, value, attrs)
 
     def _has_changed(self, initial, data):
+        # If our field has show_hidden_initial=True, initial will be a string
+        # formatted by HiddenInput using formats.localize_input, which is not
+        # necessarily the format used for this widget. Attempt to convert it.
+        try:
+            input_format = '%Y-%m-%d %H:%M:%S'
+            initial = datetime.datetime(*time.strptime(initial, input_format)[:6])
+        except (TypeError, ValueError):
+            pass
         return super(DateTimeInput, self)._has_changed(self._format_value(initial), data)
 
 class TimeInput(Input):
@@ -366,6 +383,14 @@ class TimeInput(Input):
         return super(TimeInput, self).render(name, value, attrs)
 
     def _has_changed(self, initial, data):
+        # If our field has show_hidden_initial=True, initial will be a string
+        # formatted by HiddenInput using formats.localize_input, which is not
+        # necessarily the format used for this  widget. Attempt to convert it.
+        try:
+            input_format = '%H:%M:%S'
+            initial = datetime.time(*time.strptime(initial, input_format)[3:6])
+        except (TypeError, ValueError):
+            pass
         return super(TimeInput, self)._has_changed(self._format_value(initial), data)
 
 class CheckboxInput(Widget):
diff --git a/tests/regressiontests/forms/widgets.py b/tests/regressiontests/forms/widgets.py
index 204f4d0573..a397cdf63b 100644
--- a/tests/regressiontests/forms/widgets.py
+++ b/tests/regressiontests/forms/widgets.py
@@ -3,6 +3,7 @@ tests = r"""
 >>> from django.forms import *
 >>> from django.forms.widgets import RadioFieldRenderer
 >>> from django.utils.safestring import mark_safe
+>>> from django.utils.encoding import force_unicode
 >>> import datetime
 >>> import time
 >>> import re
@@ -1134,6 +1135,15 @@ u'<input type="text" name="date" value="17/09/2007 12:51" />'
 >>> w._has_changed(d, '17/09/2007 12:51')
 False
 
+Make sure a custom format works with _has_changed. The hidden input will use
+force_unicode to display the initial value.
+>>> data = datetime.datetime(2010, 3, 6, 12, 0, 0)
+>>> custom_format = '%d.%m.%Y %H:%M'
+>>> w = DateTimeInput(format=custom_format)
+>>> w._has_changed(force_unicode(data), data.strftime(custom_format))
+False
+
+
 # DateInput ###################################################################
 
 >>> w = DateInput()
@@ -1159,6 +1169,15 @@ u'<input type="text" name="date" value="17/09/2007" />'
 >>> w._has_changed(d, '17/09/2007')
 False
 
+Make sure a custom format works with _has_changed. The hidden input will use
+force_unicode to display the initial value.
+>>> data = datetime.date(2010, 3, 6)
+>>> custom_format = '%d.%m.%Y'
+>>> w = DateInput(format=custom_format)
+>>> w._has_changed(force_unicode(data), data.strftime(custom_format))
+False
+
+
 # TimeInput ###################################################################
 
 >>> w = TimeInput()
@@ -1187,6 +1206,15 @@ u'<input type="text" name="time" value="12:51" />'
 >>> w._has_changed(t, '12:51')
 False
 
+Make sure a custom format works with _has_changed. The hidden input will use
+force_unicode to display the initial value.
+>>> data = datetime.time(13, 0)
+>>> custom_format = '%I:%M %p'
+>>> w = TimeInput(format=custom_format)
+>>> w._has_changed(force_unicode(data), data.strftime(custom_format))
+False
+
+
 # SplitHiddenDateTimeWidget ###################################################
 
 >>> from django.forms.widgets import SplitHiddenDateTimeWidget