Fix overflow in DateTime + negative Duration (#1279)

Author: robsdedude

src/neo4j/time/__init__.py

@@ -2730,7 +2730,7 @@ def __add__(self, other: _timedelta | Duration) -> DateTime:
             t = self.time()._to_clock_time() + _ClockTime(
                 other.seconds, other.nanoseconds
             )
-            days, seconds = _symmetric_divmod(t.seconds, 86400)
+            days, seconds = divmod(t.seconds, 86400)
             date_ = self.date() + Duration(
                 months=other.months, days=days + other.days
             )

tests/unit/common/time/test_datetime.py

@@ -311,6 +311,11 @@ def test_subtract_native_datetime_2(self) -> None:
                 Duration(hours=24),
                 DateTime(2024, 4, 1, 0, 30, 0),
             ),
+            (
+                DateTime(2025, 1, 1, 13, 45, 30, 123456789),
+                Duration(seconds=-50400),
+                DateTime(2024, 12, 31, 23, 45, 30, 123456789),
+            ),
             (
                 DateTime(2024, 3, 31, 0, 30, 0),
                 timedelta(microseconds=1),
@@ -321,6 +326,11 @@ def test_subtract_native_datetime_2(self) -> None:
                 timedelta(hours=24),
                 DateTime(2024, 4, 1, 0, 30, 0),
             ),
+            (
+                DateTime(2025, 1, 1, 13, 45, 30, 123456789),
+                timedelta(seconds=-50400),
+                DateTime(2024, 12, 31, 23, 45, 30, 123456789),
+            ),
         ),
     )
     @pytest.mark.parametrize(