Fixed #35986 -- Fixed test classes with @translation.override decorator.

Co-authored-by: Simon Charette <charette.s@gmail.com>

django/templatetags/tz.py

@@ -1,5 +1,5 @@
 import zoneinfo
-from datetime import datetime, tzinfo
+from datetime import datetime, tzinfo, UTC
 
 from django.template import Library, Node, TemplateSyntaxError
 from django.utils import timezone
@@ -31,7 +31,7 @@ def utc(value):
     """
     Convert a datetime to UTC.
     """
-    return do_timezone(value, datetime.UTC)
+    return do_timezone(value, UTC)
 
 
 @register.filter("timezone")

tests/forms_tests/tests/test_input_formats.py

@@ -118,9 +118,13 @@ class LocalizedTimeTests(SimpleTestCase):
         self.assertEqual(text, "13:30:00")
 
 
-@translation.override(None)
 @override_settings(TIME_INPUT_FORMATS=["%I:%M:%S %p", "%I:%M %p"])
 class CustomTimeInputFormatsTests(SimpleTestCase):
+    @classmethod
+    def setUpClass(cls):
+        cls.enterClassContext(translation.override(None))
+        super().setUpClass()
+
     def test_timeField(self):
         "TimeFields can parse dates in the default format"
         f = forms.TimeField()
@@ -431,9 +435,13 @@ class LocalizedDateTests(SimpleTestCase):
         self.assertEqual(text, "21.12.2010")
 
 
-@translation.override(None)
 @override_settings(DATE_INPUT_FORMATS=["%d.%m.%Y", "%d-%m-%Y"])
 class CustomDateInputFormatsTests(SimpleTestCase):
+    @classmethod
+    def setUpClass(cls):
+        cls.enterClassContext(translation.override(None))
+        super().setUpClass()
+
     def test_dateField(self):
         "DateFields can parse dates in the default format"
         f = forms.DateField()
@@ -752,9 +760,13 @@ class LocalizedDateTimeTests(SimpleTestCase):
         self.assertEqual(text, "21.12.2010 13:30:00")
 
 
-@translation.override(None)
 @override_settings(DATETIME_INPUT_FORMATS=["%I:%M:%S %p %d/%m/%Y", "%I:%M %p %d-%m-%Y"])
 class CustomDateTimeInputFormatsTests(SimpleTestCase):
+    @classmethod
+    def setUpClass(cls):
+        cls.enterClassContext(translation.override(None))
+        super().setUpClass()
+
     def test_dateTimeField(self):
         "DateTimeFields can parse dates in the default format"
         f = forms.DateTimeField()

tests/timezones/tests.py

@@ -921,9 +921,13 @@ class SerializationTests(SimpleTestCase):
                 self.assertEqual(obj.dt, dt)
 
 
-@translation.override(None)
 @override_settings(DATETIME_FORMAT="c", TIME_ZONE="Africa/Nairobi", USE_TZ=True)
 class TemplateTests(SimpleTestCase):
+    @classmethod
+    def setUpClass(cls):
+        cls.enterClassContext(translation.override(None))
+        super().setUpClass()
+
     @requires_tz_support
     def test_localtime_templatetag_and_filters(self):
         """
@@ -1324,7 +1328,6 @@ class NewFormsTests(TestCase):
             self.assertIn("2011-09-01 17:20:30", str(form))
 
 
-@translation.override(None)
 @override_settings(
     DATETIME_FORMAT="c",
     TIME_ZONE="Africa/Nairobi",
@@ -1334,6 +1337,7 @@ class NewFormsTests(TestCase):
 class AdminTests(TestCase):
     @classmethod
     def setUpTestData(cls):
+        cls.enterClassContext(translation.override(None))
         cls.u1 = User.objects.create_user(
             password="secret",
             last_login=datetime.datetime(2007, 5, 30, 13, 20, 10, tzinfo=UTC),