diff --git a/.generator/schemas/v2/openapi.yaml b/.generator/schemas/v2/openapi.yaml
index 52c13bf6e5..a85dddedd4 100644
--- a/.generator/schemas/v2/openapi.yaml
+++ b/.generator/schemas/v2/openapi.yaml
@@ -77079,12 +77079,13 @@ paths:
         schema:
           example: 3653d3c6-0c75-11ea-ad28-fb5701eabc7d
           type: string
-      - description: Retrieves the on-call user at the given timestamp (ISO-8601).
-          Defaults to the current time if omitted."
+      - description: Retrieves the on-call user at the given timestamp in RFC3339
+          format (for example, `2025-05-07T02:53:01+00:00`). Defaults to the current
+          time if omitted.
         in: query
         name: filter[at_ts]
         schema:
-          example: '2025-05-07T02:53:01Z'
+          example: '2025-05-07T02:53:01+00:00'
           type: string
       responses:
         '200':
diff --git a/src/datadog_api_client/v2/api/on_call_api.py b/src/datadog_api_client/v2/api/on_call_api.py
index c2565ada20..3c65425691 100644
--- a/src/datadog_api_client/v2/api/on_call_api.py
+++ b/src/datadog_api_client/v2/api/on_call_api.py
@@ -889,7 +889,7 @@ def get_schedule_on_call_user(
         :type schedule_id: str
         :param include: Specifies related resources to include in the response as a comma-separated list. Allowed value: ``user``.
         :type include: str, optional
-        :param filter_at_ts: Retrieves the on-call user at the given timestamp (ISO-8601). Defaults to the current time if omitted."
+        :param filter_at_ts: Retrieves the on-call user at the given timestamp in RFC3339 format (for example, ``2025-05-07T02:53:01+00:00`` ). Defaults to the current time if omitted.
         :type filter_at_ts: str, optional
         :rtype: Shift
         """