Fixed #30141 -- Fixed parse_duration() for some negative durations.

2 files changed, 9 insertions, 5 deletions

diff --git a/django/utils/dateparse.py b/django/utils/dateparse.py
index 8d08b7d1d3..f90d952581 100644
--- a/django/utils/dateparse.py
+++ b/django/utils/dateparse.py
@@ -29,9 +29,10 @@ datetime_re = re.compile(
 standard_duration_re = re.compile(
     r'^'
     r'(?:(?P<days>-?\d+) (days?, )?)?'
-    r'((?:(?P<hours>-?\d+):)(?=\d+:\d+))?'
-    r'(?:(?P<minutes>-?\d+):)?'
-    r'(?P<seconds>-?\d+)'
+    r'(?P<sign>-?)'
+    r'((?:(?P<hours>\d+):)(?=\d+:\d+))?'
+    r'(?:(?P<minutes>\d+):)?'
+    r'(?P<seconds>\d+)'
     r'(?:\.(?P<microseconds>\d{1,6})\d{0,6})?'
     r'$'
 )
diff --git a/tests/utils_tests/test_dateparse.py b/tests/utils_tests/test_dateparse.py
index 8d464278ce..535815c7e2 100644
--- a/tests/utils_tests/test_dateparse.py
+++ b/tests/utils_tests/test_dateparse.py
@@ -113,9 +113,12 @@ class DurationParseTests(unittest.TestCase):
         test_values = (
             ('-4 15:30', timedelta(days=-4, minutes=15, seconds=30)),
             ('-172800', timedelta(days=-2)),
-            ('-15:30', timedelta(minutes=-15, seconds=30)),
-            ('-1:15:30', timedelta(hours=-1, minutes=15, seconds=30)),
+            ('-15:30', timedelta(minutes=-15, seconds=-30)),
+            ('-1:15:30', timedelta(hours=-1, minutes=-15, seconds=-30)),
             ('-30.1', timedelta(seconds=-30, milliseconds=-100)),
+            ('-00:01:01', timedelta(minutes=-1, seconds=-1)),
+            ('-01:01', timedelta(seconds=-61)),
+            ('-01:-01', None),
         )
         for source, expected in test_values:
             with self.subTest(source=source):