From 8993f909623db47fcbbc45af205ecc19ebce24c9 Mon Sep 17 00:00:00 2001
From: Tim Jenness <tjenness@lsst.org>
Date: Tue, 21 Nov 2023 13:10:05 -0700
Subject: [PATCH] Use datetime.UTC instead of datetime.timezone

---
 python/lsst/daf/butler/cli/cliLog.py | 2 +-
 python/lsst/daf/butler/logging.py    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/python/lsst/daf/butler/cli/cliLog.py b/python/lsst/daf/butler/cli/cliLog.py
index 45ac6e4b46..720c19acbe 100644
--- a/python/lsst/daf/butler/cli/cliLog.py
+++ b/python/lsst/daf/butler/cli/cliLog.py
@@ -56,7 +56,7 @@ class PrecisionLogFormatter(logging.Formatter):
 
     def formatTime(self, record: logging.LogRecord, datefmt: str | None = None) -> str:
         """Format the time as an aware datetime."""
-        ct: datetime.datetime = self.converter(record.created, tz=datetime.timezone.utc)  # type: ignore
+        ct: datetime.datetime = self.converter(record.created, tz=datetime.UTC)  # type: ignore
         if self.use_local:
             ct = ct.astimezone()
         if datefmt:
diff --git a/python/lsst/daf/butler/logging.py b/python/lsst/daf/butler/logging.py
index 8c6b97bc5a..3a5ea11a6a 100644
--- a/python/lsst/daf/butler/logging.py
+++ b/python/lsst/daf/butler/logging.py
@@ -236,7 +236,7 @@ def from_record(cls, record: LogRecord) -> "ButlerLogRecord":
         # Always use UTC because in distributed systems we can't be sure
         # what timezone localtime is and it's easier to compare logs if
         # every system is using the same time.
-        record_dict["asctime"] = datetime.datetime.fromtimestamp(record.created, tz=datetime.timezone.utc)
+        record_dict["asctime"] = datetime.datetime.fromtimestamp(record.created, tz=datetime.UTC)
 
         # Sometimes exception information is included so must be
         # extracted.