Add %z for %(asctime)s to fix timezone for logs on UI

airflow/config_templates/airflow_local_settings.py

@@ -38,6 +38,10 @@
 
 LOG_FORMAT: str = conf.get_mandatory_value('logging', 'LOG_FORMAT')
 
+LOG_FORMATTER_CLASS: str = conf.get_mandatory_value(
+    'logging', 'LOG_FORMATTER_CLASS', fallback='airflow.utils.log.timezone_aware.TimezoneAware'
+)
+
 COLORED_LOG_FORMAT: str = conf.get_mandatory_value('logging', 'COLORED_LOG_FORMAT')
 
 COLORED_LOG: bool = conf.getboolean('logging', 'COLORED_CONSOLE_LOG')
@@ -60,10 +64,13 @@
     'version': 1,
     'disable_existing_loggers': False,
     'formatters': {
-        'airflow': {'format': LOG_FORMAT},
+        'airflow': {
+            'format': LOG_FORMAT,
+            'class': LOG_FORMATTER_CLASS,
+        },
         'airflow_coloured': {
             'format': COLORED_LOG_FORMAT if COLORED_LOG else LOG_FORMAT,
-            'class': COLORED_FORMATTER_CLASS if COLORED_LOG else 'logging.Formatter',
+            'class': COLORED_FORMATTER_CLASS if COLORED_LOG else LOG_FORMATTER_CLASS,
         },
     },
     'filters': {

airflow/config_templates/config.yml

@@ -633,6 +633,12 @@
       type: string
       example: ~
       default: "%%(asctime)s %%(levelname)s - %%(message)s"
+    - name: log_formatter_class
+      description: ~
+      version_added: 2.3.4
+      type: string
+      example: ~
+      default: "airflow.utils.log.timezone_aware.TimezoneAware"
     - name: task_log_prefix_template
       description: |
         Specify prefix pattern like mentioned below with stream handler TaskHandlerWithCustomFormatter

airflow/config_templates/default_airflow.cfg

@@ -349,6 +349,7 @@ colored_formatter_class = airflow.utils.log.colored_log.CustomTTYColoredFormatte
 # Format of Log line
 log_format = [%%(asctime)s] {{%%(filename)s:%%(lineno)d}} %%(levelname)s - %%(message)s
 simple_log_format = %%(asctime)s %%(levelname)s - %%(message)s
+log_formatter_class = airflow.utils.log.timezone_aware.TimezoneAware
 
 # Specify prefix pattern like mentioned below with stream handler TaskHandlerWithCustomFormatter
 # Example: task_log_prefix_template = {{ti.dag_id}}-{{ti.task_id}}-{{execution_date}}-{{try_number}}

airflow/utils/log/timezone_aware.py

@@ -0,0 +1,49 @@
+# Licensed to the Apache Software Foundation (ASF) under one
+# or more contributor license agreements.  See the NOTICE file
+# distributed with this work for additional information
+# regarding copyright ownership.  The ASF licenses this file
+# to you under the Apache License, Version 2.0 (the
+# "License"); you may not use this file except in compliance
+# with the License.  You may obtain a copy of the License at
+#
+#   http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing,
+# software distributed under the License is distributed on an
+# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+# KIND, either express or implied.  See the License for the
+# specific language governing permissions and limitations
+# under the License.
+import logging
+
+import pendulum
+
+
+class TimezoneAware(logging.Formatter):
+    """
+    Override `default_time_format`, `default_msec_format` and `formatTime` to specify utc offset.
+    utc offset is the matter, without it, time conversion could be wrong.
+    With this Formatter, `%(asctime)s` will be formatted containing utc offset. (ISO 8601)
+    (e.g. 2022-06-12T13:00:00.123+0000)
+    """
+
+    default_time_format = '%Y-%m-%dT%H:%M:%S'
+    default_msec_format = '%s.%03d'
+    default_tz_format = '%z'
+
+    def formatTime(self, record, datefmt=None):
+        """
+        Returns the creation time of the specified LogRecord in ISO 8601 date and time format
+        in the local time zone.
+        """
+        dt = pendulum.from_timestamp(record.created, tz=pendulum.local_timezone())
+        if datefmt:
+            s = dt.strftime(datefmt)
+        else:
+            s = dt.strftime(self.default_time_format)
+
+        if self.default_msec_format:
+            s = self.default_msec_format % (s, record.msecs)
+        if self.default_tz_format:
+            s += dt.strftime(self.default_tz_format)
+        return s

airflow/www/static/js/ti_log.js

@@ -103,6 +103,7 @@ function autoTailingLog(tryNumber, metadata = null, autoTailing = false) {
       // Detect urls and log timestamps
       const urlRegex = /http(s)?:\/\/[\w.-]+(\.?:[\w.-]+)*([/?#][\w\-._~:/?#[\]@!$&'()*+,;=.%]+)?/g;
       const dateRegex = /\d{4}[./-]\d{2}[./-]\d{2} \d{2}:\d{2}:\d{2},\d{3}/g;
+      const iso8601Regex = /\d{4}[./-]\d{2}[./-]\d{2}T\d{2}:\d{2}:\d{2}.\d{3}[+-]\d{4}/g;
 
       res.message.forEach((item) => {
         const logBlockElementId = `try-${tryNumber}-${item[0]}`;
@@ -120,7 +121,8 @@ function autoTailingLog(tryNumber, metadata = null, autoTailing = false) {
         const escapedMessage = escapeHtml(item[1]);
         const linkifiedMessage = escapedMessage
           .replace(urlRegex, (url) => `<a href="${url}" target="_blank">${url}</a>`)
-          .replaceAll(dateRegex, (date) => `<time datetime="${date}+00:00" data-with-tz="true">${formatDateTime(`${date}+00:00`)}</time>`);
+          .replaceAll(dateRegex, (date) => `<time datetime="${date}+00:00" data-with-tz="true">${formatDateTime(`${date}+00:00`)}</time>`)
+          .replaceAll(iso8601Regex, (date) => `<time datetime="${date}" data-with-tz="true">${formatDateTime(`${date}`)}</time>`);
         logBlock.innerHTML += `${linkifiedMessage}\n`;
       });
 

newsfragments/24811.significant.rst

@@ -0,0 +1,22 @@
+Added new config ``[logging]log_formatter_class`` to fix timezone display for logs on UI
+
+If you are using a custom Formatter subclass in your ``[logging]logging_config_class``, please inherit from ``airflow.utils.log.timezone_aware.TimezoneAware`` instead of ``logging.Formatter``.
+For example, in your ``custom_config.py``:
+
+.. code-block:: python
+   from airflow.utils.log.timezone_aware import TimezoneAware
+
+   # before
+   class YourCustomFormatter(logging.Formatter):
+       ...
+
+
+   # after
+   class YourCustomFormatter(TimezoneAware):
+       ...
+
+
+   AIRFLOW_FORMATTER = LOGGING_CONFIG["formatters"]["airflow"]
+   AIRFLOW_FORMATTER["class"] = "somewhere.your.custom_config.YourCustomFormatter"
+   # or use TimezoneAware class directly. If you don't have custom Formatter.
+   AIRFLOW_FORMATTER["class"] = "airflow.utils.log.timezone_aware.TimezoneAware"