diff --git a/python/publish_unit_test_results.py b/python/publish_unit_test_results.py
index 8b00e293..a4ff8ee8 100644
--- a/python/publish_unit_test_results.py
+++ b/python/publish_unit_test_results.py
@@ -103,6 +103,7 @@ def main(settings: Settings, gha: GithubAction) -> None:
     logger.info(f'Available memory to read files: {avail_mem}')
 
     # log the progress
+    # https://github.com/EnricoMi/publish-unit-test-result-action/issues/304
     with progress_logger(items=len(files),
                          interval_seconds=10,
                          progress_template='Read {progress} files in {time}',
diff --git a/python/test/test_progress.py b/python/test/test_progress.py
index 7f035556..2b331add 100644
--- a/python/test/test_progress.py
+++ b/python/test/test_progress.py
@@ -1,5 +1,5 @@
 import unittest
-from datetime import datetime
+from datetime import datetime, timezone
 
 import mock
 
@@ -32,7 +32,7 @@ def test(self):
         logger = mock.MagicMock(info=mock.Mock())
         plogger = ProgressLogger(progress, 60, 'progress: {progress} in {time}', logger)
         try:
-            ts = datetime.fromisoformat('2022-06-01 12:34:56')
+            ts = datetime(2022, 6, 1, 12, 34, 56, tzinfo=timezone.utc)
             with mock.patch('publish.progress.datetime', utcnow=mock.Mock(return_value=ts)):
                 plogger.start()
             logger.info.assert_not_called()
@@ -40,7 +40,7 @@ def test(self):
             progress.observe('item')
             logger.info.assert_not_called()
 
-            ts = datetime.fromisoformat('2022-06-01 12:35:00')
+            ts = datetime(2022, 6, 1, 12, 35, 00, tzinfo=timezone.utc)
             with mock.patch('publish.progress.datetime', utcnow=mock.Mock(return_value=ts)):
                 plogger._log_progress()
             self.assertEqual([mock.call('progress: 1 of 10 in 4 seconds')], logger.info.call_args_list)
@@ -50,13 +50,13 @@ def test(self):
             progress.observe('item')
             logger.info.assert_not_called()
 
-            ts = datetime.fromisoformat('2022-06-01 12:40:00')
+            ts = datetime(2022, 6, 1, 12, 40, 00, tzinfo=timezone.utc)
             with mock.patch('publish.progress.datetime', utcnow=mock.Mock(return_value=ts)):
                 plogger._log_progress()
             self.assertEqual([mock.call('progress: 3 of 10 in 5 minutes and 4 seconds')], logger.info.call_args_list)
             logger.info.reset_mock()
         finally:
-            ts = datetime.fromisoformat('2022-06-01 12:41:23')
+            ts = datetime(2022, 6, 1, 12, 41, 23, tzinfo=timezone.utc)
             with mock.patch('publish.progress.datetime', utcnow=mock.Mock(return_value=ts)):
                 plogger.finish('finished: {observations} of {items} in {duration}')
             self.assertEqual([mock.call('finished: 3 of 10 in 6 minutes and 27 seconds')], logger.info.call_args_list)