fix: skip time truncation for date objects in truncate_datetime

deepdiff/helper.py

@@ -690,7 +690,9 @@ def datetime_normalize(
         datetime.timezone, "BaseTzInfo"
     ] = datetime.timezone.utc,
 ) -> Any:
-    if truncate_datetime:
+    # A plain date has no time component, so truncation does not apply to it.
+    has_time = not (isinstance(obj, datetime.date) and not isinstance(obj, datetime.datetime))
+    if truncate_datetime and has_time:
         if truncate_datetime == 'second':
             obj = obj.replace(microsecond=0)
         elif truncate_datetime == 'minute':

tests/test_diff_other.py

@@ -71,6 +71,15 @@ def test_truncate_datetime(self):
         res = DeepDiff(d1, d2, truncate_datetime='second')
         assert res['values_changed']["root['a']"]['new_value'] == 80139
 
+    def test_truncate_datetime_with_date(self):
+        d1 = {'a': datetime.date(2020, 5, 17)}
+        d2 = {'a': datetime.date(2020, 5, 17)}
+        assert DeepDiff(d1, d2, truncate_datetime='minute') == {}
+
+        d3 = {'a': datetime.date(2020, 5, 18)}
+        res = DeepDiff(d1, d3, truncate_datetime='day')
+        assert res['values_changed']["root['a']"]['new_value'] == datetime.date(2020, 5, 18)
+
     def test_invalid_verbose_level(self):
         with pytest.raises(ValueError) as excinfo:
             DeepDiff(1, 2, verbose_level=5)