Fixed #29514 -- Reverted "Used datetime.timezone.utc instead of pytz.utc for better performance."

This reverts commit 27ca5ce19f5f184018a61611c1bc319113b1d107 due to a
regression.

1 files changed, 1 insertions, 1 deletions

diff --git a/django/db/migrations/serializer.py b/django/db/migrations/serializer.py
index 66370cc1d4..9b251e54cd 100644
--- a/django/db/migrations/serializer.py
+++ b/django/db/migrations/serializer.py
@@ -50,7 +50,7 @@ class DatetimeSerializer(BaseSerializer):
     def serialize(self):
         if self.value.tzinfo is not None and self.value.tzinfo != utc:
             self.value = self.value.astimezone(utc)
-        value_repr = repr(self.value).replace("datetime.timezone(datetime.timedelta(0), 'UTC')", 'utc')
+        value_repr = repr(self.value).replace("<UTC>", "utc")
         if isinstance(self.value, datetime_safe.datetime):
             value_repr = "datetime.%s" % value_repr
         imports = ["import datetime"]