diff --git a/django/forms/fields.py b/django/forms/fields.py
index a794c02e9f..76ee9b91d3 100644
--- a/django/forms/fields.py
+++ b/django/forms/fields.py
@@ -118,6 +118,8 @@ class Field(object):
         super(Field, self).__init__()
 
     def prepare_value(self, value):
+        if self.widget.is_localized:
+            value = formats.localize_input(value)
         return value
 
     def to_python(self, value):
@@ -460,6 +462,7 @@ class DateTimeField(BaseTemporalField):
     }
 
     def prepare_value(self, value):
+        value = super(DateTimeField, self).prepare_value(value)
         if isinstance(value, datetime.datetime):
             value = to_current_timezone(value)
         return value
diff --git a/tests/i18n/tests.py b/tests/i18n/tests.py
index 019ed88cdb..bd61943cc1 100644
--- a/tests/i18n/tests.py
+++ b/tests/i18n/tests.py
@@ -774,6 +774,39 @@ class FormattingTests(TransRealMixin, TestCase):
                 self.assertEqual(template2.render(context), output2)
                 self.assertEqual(template3.render(context), output3)
 
+    def test_localized_as_text_as_hidden_input(self):
+        """
+        Tests if form input with 'as_hidden' or 'as_text' is correctly localized. Ticket #18777
+        """
+        self.maxDiff = 1200
+
+        with translation.override('de-at', deactivate=True):
+            template = Template('{% load l10n %}{{ form.date_added }}; {{ form.cents_paid }}')
+            template_as_text = Template('{% load l10n %}{{ form.date_added.as_text }}; {{ form.cents_paid.as_text }}')
+            template_as_hidden = Template('{% load l10n %}{{ form.date_added.as_hidden }}; {{ form.cents_paid.as_hidden }}')
+            form = CompanyForm({
+                'name': 'acme',
+                'date_added': datetime.datetime(2009, 12, 31, 6, 0, 0),
+                'cents_paid': decimal.Decimal('59.47'),
+                'products_delivered': 12000,
+                })
+            context = Context({'form': form })
+            self.assertTrue(form.is_valid())
+
+            self.assertHTMLEqual(
+                template.render(context),
+                '<input id="id_date_added" name="date_added" type="text" value="31.12.2009 06:00:00" />; <input id="id_cents_paid" name="cents_paid" type="text" value="59,47" />'
+            )
+            self.assertHTMLEqual(
+                template_as_text.render(context),
+                '<input id="id_date_added" name="date_added" type="text" value="31.12.2009 06:00:00" />; <input id="id_cents_paid" name="cents_paid" type="text" value="59,47" />'
+            )
+            self.assertHTMLEqual(
+                template_as_hidden.render(context),
+                '<input id="id_date_added" name="date_added" type="hidden" value="31.12.2009 06:00:00" />; <input id="id_cents_paid" name="cents_paid" type="hidden" value="59,47" />'
+            )
+
+
 class MiscTests(TransRealMixin, TestCase):
 
     def setUp(self):