diff --git a/CHANGELOG.md b/CHANGELOG.md
index d4c7952..de7e433 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -12,6 +12,8 @@ The format is based on [Keep a Changelog], and this project adheres to
 - [#14](https://github.com/MAAP-Project/gedi-subsetter/issues/14) AWS S3
   credentials are no longer obtained via the `maap-py` library.  Instead, they
   are obtained via a role using the EC2 instance metadata.
+- [#72](https://github.com/MAAP-Project/gedi-subsetter/issues/72) Log messages
+  now use ISO 8601 UTC combined date and time representations with milliseconds.
 
 ## 0.7.0 (2024-04-23)
 
diff --git a/src/gedi_subset/subset.py b/src/gedi_subset/subset.py
index bf20bd8..7b10f53 100755
--- a/src/gedi_subset/subset.py
+++ b/src/gedi_subset/subset.py
@@ -4,6 +4,7 @@
 import multiprocessing
 import os
 import os.path
+import time
 from dataclasses import dataclass
 from pathlib import Path
 from typing import Any, Callable, Iterable, Mapping, NoReturn, Optional, Sequence, Tuple
@@ -49,6 +50,10 @@
 LOGGING_FORMAT = "%(asctime)s [%(processName)s:%(name)s] [%(levelname)s] %(message)s"
 
 logging.basicConfig(level=logging.INFO, format=LOGGING_FORMAT)
+logging.Formatter.converter = time.gmtime
+logging.Formatter.default_time_format = "%Y-%m-%dT%H:%M:%S"
+logging.Formatter.default_msec_format = "%s,%03dZ"
+
 logger = logging.getLogger("gedi_subset")