diff --git a/airbyte-integrations/connectors/source-aircall/spec.patch.json b/airbyte-integrations/connectors/source-aircall/spec.patch.json
index c2686b0dc673..a8dc2abf70f2 100644
--- a/airbyte-integrations/connectors/source-aircall/spec.patch.json
+++ b/airbyte-integrations/connectors/source-aircall/spec.patch.json
@@ -2,7 +2,7 @@
   "properties": {
     "start_date": {
       "default": "2023-01-01T00:00:00.000Z",
-      "format": null
+      "format": "date-time"
     }
   }
 }