diff --git a/client/python/karanage/karanage/__init__.py b/client/python/karanage/karanage/__init__.py
index 4bac672..82e2238 100755
--- a/client/python/karanage/karanage/__init__.py
+++ b/client/python/karanage/karanage/__init__.py
@@ -10,4 +10,5 @@
 from .exception import KaranageException
 from .connection import KaranageConnection
 from .state import StateSystem, KaranageState
-from .log import KaranageLog
+from .log import KaranageLog, GroupLogElement
+
diff --git a/client/python/karanage/karanage/log.py b/client/python/karanage/karanage/log.py
index f14730b..cf0af2d 100644
--- a/client/python/karanage/karanage/log.py
+++ b/client/python/karanage/karanage/log.py
@@ -10,12 +10,13 @@
 import enum
 import requests
 import json
-from typing import Dict, Optional
+from datetime import datetime, timezone
+from typing import Dict, Optional, List
 from .connection import KaranageConnection
 from .exception import KaranageException
 
 class GroupLogElement:
-    def __init__(self, id: int, time: Datetime:None, data: str):
+    def __init__(self, id: int, data: str, time: datetime = None):
         self.id = id
         self.time = time
         self.data = data
@@ -35,7 +36,7 @@ class KaranageLog:
             return self.connection.get_url(self.service)
         return f"{self.connection.get_url(self.service)}/{self.system}"
 
-    def send(self, data: Dict, id: int = None, uuid_group: int= None, time: Datetime = None) -> None:
+    def send(self, data: Dict, id: Optional[int] = None, uuid_group: Optional[int] = None, time: Optional[datetime] = None) -> None:
         """Send a message to the server.
         :param data: Data to send to the server
         :param id: Local internal ID
@@ -48,7 +49,7 @@ class KaranageLog:
         if uuid_group is not None:
             param["uuid"] = uuid_group
         if time is not None:
-            param["time"] = id
+            param["time"] = time.astimezone(timezone.utc).isoformat()
         header = self.connection.get_header()
         try:
             ret = requests.post(self.get_url(), json=data, headers=header, params=param)
@@ -57,11 +58,20 @@ class KaranageLog:
         if not 200 <= ret.status_code <= 299:
             raise KaranageException(f"Fail send message: {self.get_url()}", ret.status_code, ret.content.decode("utf-8"))
 
-    def send_multiple(self, data: List[GroupLogElement], uuid_group: int= None) -> None:
+    def send_multiple(self, data_input: List[GroupLogElement], uuid_group: Optional[int]= None) -> None:
         """Send multiple log message to the server.
         :param data: Data to send to the server
         :param uuid_group: local internal group UUID
         """
+        # Convert:
+        data = []
+        for elem in data_input:
+            data.append({
+                "id": elem.id,
+                "time": elem.time.astimezone(timezone.utc).isoformat(),
+                "data": elem.data,
+            })
+
         param = {}
         if uuid_group is not None:
             param["uuid"] = uuid_group