Fix timezone in log arrival and delta time

logprep/abc/input.py

@@ -8,9 +8,10 @@
 import zlib
 from abc import abstractmethod
 from copy import deepcopy
-from functools import partial
+from functools import partial, cached_property
 from hmac import HMAC
 from typing import Optional, Tuple
+from zoneinfo import ZoneInfo
 
 from attrs import define, field, validators
 
@@ -198,6 +199,11 @@ def _add_version_info(self):
         """Check and return if the version info should be added to the event."""
         return bool(self._config.preprocessing.get("version_info_target_field"))
 
+    @cached_property
+    def _log_arrival_timestamp_timezone(self):
+        """Returns the timezone for log arrival timestamps"""
+        return ZoneInfo("UTC")
+
     @property
     def _add_log_arrival_time_information(self):
         """Check and return if the log arrival time info should be added to the event."""
@@ -314,7 +320,7 @@ def _add_arrival_time_information_to_event(self, event: dict):
         new_field = {
             self._config.preprocessing.get(
                 "log_arrival_time_target_field"
-            ): TimeParser.now().isoformat()
+            ): TimeParser.now(self._log_arrival_timestamp_timezone).isoformat()
         }
         add_fields_to(event, new_field)