diff --git a/utils/queues.py b/utils/queues.py
index 076dbfa..e829b1c 100644
--- a/utils/queues.py
+++ b/utils/queues.py
@@ -44,7 +44,7 @@ class TasksHandlerMixin:
                 print(f'Failed to finish task id={task["id"]}')
             try:
                 metric = requests.post('http://monitoring:1237/api/v1/metrics/task', json={
-                    'timestamp': start.isoformat(),
+                    'timestamp': start.strftime("%Y-%m-%dT%H:%M:%S") + "Z",
                     'service': 'botalka',
                     'environment': stage,
                     'queue': self.queue_name,