[4.2.x] Fixed #34483 -- Fixed timesince()/timeuntil() with timezone-aware dates and interval less than 1 day.

Regression in 8d67e16493.

Thanks Lorenzo Peña for the report.

Backport of 813015d67e from main

tests/utils_tests/test_timesince.py

@@ -1,4 +1,5 @@
 import datetime
+import zoneinfo
 
 from django.test import TestCase
 from django.test.utils import override_settings, requires_tz_support
@@ -241,6 +242,22 @@ class TimesinceTests(TestCase):
         with self.assertRaisesMessage(ValueError, msg):
             timesince(self.t, self.t, depth=0)
 
+    @requires_tz_support
+    def test_less_than_a_day_with_zoneinfo(self):
+        now_with_zoneinfo = timezone.now().astimezone(
+            zoneinfo.ZoneInfo(key="Asia/Kathmandu")  # UTC+05:45
+        )
+        tests = [
+            (now_with_zoneinfo, "0\xa0minutes"),
+            (now_with_zoneinfo - self.onemicrosecond, "0\xa0minutes"),
+            (now_with_zoneinfo - self.onesecond, "0\xa0minutes"),
+            (now_with_zoneinfo - self.oneminute, "1\xa0minute"),
+            (now_with_zoneinfo - self.onehour, "1\xa0hour"),
+        ]
+        for value, expected in tests:
+            with self.subTest(value):
+                self.assertEqual(timesince(value), expected)
+
 
 @requires_tz_support
 @override_settings(USE_TZ=True)