diff --git a/main.py b/main.py
index ee79db1..312e052 100644
--- a/main.py
+++ b/main.py
@@ -367,7 +367,8 @@ class GadgetbridgeMQTTPublisher:
 
     def query_server_time(self, cursor) -> Any:
         """Return current server time in ISO 8601 format for Home Assistant timestamp"""
-        return datetime.now().isoformat()
+        # .astimezone() adds the system's local timezone offset (e.g., +01:00)
+        return datetime.now().astimezone().isoformat()
 
     def get_sensor_data(self) -> Dict[str, Any]:
         """Query all sensors and return their values as a dict"""