chore: improve validation and handler of logging timezone with TimezoneName (#9595)

api/extensions/ext_logging.py

@@ -1,8 +1,10 @@
 import logging
 import os
 import sys
+from datetime import datetime
 from logging.handlers import RotatingFileHandler
 
+import pytz
 from flask import Flask
 
 from configs import dify_config
@@ -30,16 +32,10 @@ def init_app(app: Flask):
         handlers=log_handlers,
         force=True,
     )
+
     log_tz = dify_config.LOG_TZ
     if log_tz:
-        from datetime import datetime
-
-        import pytz
-
-        timezone = pytz.timezone(log_tz)
-
-        def time_converter(seconds):
-            return datetime.utcfromtimestamp(seconds).astimezone(timezone).timetuple()
-
         for handler in logging.root.handlers:
-            handler.formatter.converter = time_converter
+            handler.formatter.converter = lambda seconds: (
+                datetime.fromtimestamp(seconds, tz=pytz.UTC).astimezone(log_tz).timetuple()
+            )