Squashed commit:

    - Adding my name o the contributors file.

    - Updating the datetime deserialize function as well to keep both Date and DateTime in sync with each other.  Also added test case for datetime deserialization.

    - Adding test cases to show the issue before development.

CONTRIBUTORS.txt

@@ -141,3 +141,4 @@ Contributors
 - Manuel Vázquez, 2018/11/22
 - Kirill Kuzminykh, 2019/01/27
 - Damian Dimmich, 2020/07/19
+- Keith M Franklin, 2020/07/30

src/colander/__init__.py

@@ -1882,7 +1882,7 @@ def deserialize(self, node, cstruct):
                 result = iso8601.parse_date(
                     cstruct, default_timezone=self.default_tzinfo
                 )
-        except (ValueError, iso8601.ParseError) as e:
+        except (ValueError, TypeError, iso8601.ParseError) as e:
             raise Invalid(
                 node, _(self.err_template, mapping={'val': cstruct, 'err': e})
             )
@@ -1960,7 +1960,7 @@ def deserialize(self, node, cstruct):
             else:
                 result = iso8601.parse_date(cstruct)
             result = result.date()
-        except iso8601.ParseError as e:
+        except (ValueError, TypeError, iso8601.ParseError) as e:
             raise Invalid(
                 node, _(self.err_template, mapping={'val': cstruct, 'err': e})
             )

tests/test_colander.py

@@ -2631,6 +2631,17 @@ def test_deserialize_none_tzinfo(self):
         self.assertEqual(result.isoformat(), dt.isoformat())
         self.assertEqual(result.tzinfo, None)
 
+    def test_deserialize_invalid_type(self):
+        from colander import Invalid
+
+        typ = self._makeOne(default_tzinfo=None, format='%d/%m/%Y')
+        node = DummySchemaNode(None)
+        self.assertRaises(Invalid, typ.deserialize, node, 10012001)
+
+        class Anon():
+            pass
+        self.assertRaises(Invalid, typ.deserialize, node, Anon())
+
 
 class TestDate(unittest.TestCase):
     def _makeOne(self, *arg, **kw):
@@ -2745,6 +2756,25 @@ def test_deserialize_date_with_custom_format(self):
         result = typ.deserialize(node, formatted)
         self.assertEqual(result, date)
 
+    def test_deserialize_date_with_custom_format_invalid_type(self):
+        from colander import Invalid
+
+        typ = self._makeOne(format='%d/%m/%Y')
+        node = DummySchemaNode(None)
+        self.assertRaises(Invalid, typ.deserialize, node, 123)
+
+        class Anon():
+            pass
+        self.assertRaises(Invalid, typ.deserialize, node, Anon())
+
+    def test_deserialize_date_with_incorrect_format(self):
+        from colander import Invalid
+
+        typ = self._makeOne(format='%d/%m/%Y')
+        node = DummySchemaNode(None)
+        self.assertRaises(Invalid, typ.deserialize, node, "2001-01-01")
+        self.assertRaises(Invalid, typ.deserialize, node, "01012001")
+
 
 class TestTime(unittest.TestCase):
     def _makeOne(self, *arg, **kw):