Maybe should write log use UTC time. #20315

Apache Airflow version

2.2.2 (latest released)

What happened

• (1). When I set airflow.cfg with:
  default_ui_timezone = Asia/Shanghai
  default_timezone = Asia/Shanghai
• (2). start weserver and scheduler
• (3). trigger "example_bash_operator" task manually
• (4). in upper right corner select ui display timezone with "CST +(08:00)"
• (5). I find task log time in web page is wrong, it faster 8 hours than it real is.

What you expected to happen

• In web page it shdould display the correct log time.

How to reproduce

• As described In "What happened".
• I think this is cause by the logger use localtime but not UTC. Why should we save all time with UTC in database but localtime in log?

Operating System

Ubuntu 20

Versions of Apache Airflow Providers

apache-airflow-providers-ftp==2.0.1
apache-airflow-providers-http==2.0.1
apache-airflow-providers-imap==2.0.1
apache-airflow-providers-sqlite==2.0.1

Deployment

Other

Deployment details

pip freeze | grep apache-airflow-providers

Anything else

I think it's can be fixed by add a UTCFromatter for logger.
edit file "airflow/airflow/config_templates/airflow_local_settings.py"

+import logging
+import time
+
+class UTCFormatter(logging.Formatter):
+    converter = time.gmtime
+
 DEFAULT_LOGGING_CONFIG: Dict[str, Any] = {
     'version': 1,
     'disable_existing_loggers': False,
     'formatters': {
-        'airflow': {'format': LOG_FORMAT},
+        'airflow': {'()': UTCFormatter, 'format': LOG_FORMAT},

Are you willing to submit PR?

• Yes I am willing to submit a PR!

Code of Conduct

• I agree to follow this project's Code of Conduct