[1.6.x] Fixed #18766 -- Pointed to pytz when LocalTimezone fails.

Thanks void for the report.

Backport of ded11aa6 from master.

1 files changed, 7 insertions, 0 deletions

diff --git a/tests/utils_tests/test_timezone.py b/tests/utils_tests/test_timezone.py
index 650198e8ff..86e3a66008 100644
--- a/tests/utils_tests/test_timezone.py
+++ b/tests/utils_tests/test_timezone.py
@@ -2,6 +2,7 @@ import copy
 import datetime
 import pickle
 from django.test.utils import override_settings
+from django.utils import six
 from django.utils import timezone
 from django.utils.tzinfo import FixedOffset
 from django.utils import unittest
@@ -19,6 +20,12 @@ class TimezoneTests(unittest.TestCase):
         local_now = timezone.localtime(now, local_tz)
         self.assertEqual(local_now.tzinfo, local_tz)
 
+    def test_localtime_out_of_range(self):
+        local_tz = timezone.LocalTimezone()
+        long_ago = datetime.datetime(1900, 1, 1, tzinfo=timezone.utc)
+        with six.assertRaisesRegex(self, OverflowError, "install pytz"):
+            timezone.localtime(long_ago, local_tz)
+
     def test_now(self):
         with override_settings(USE_TZ=True):
             self.assertTrue(timezone.is_aware(timezone.now()))