diff --git a/acf-json/schema.json b/acf-json/schema.json
index c37e208..87cc04d 100644
--- a/acf-json/schema.json
+++ b/acf-json/schema.json
@@ -748,7 +748,7 @@
                         "id": ""
                     },
                     "display_format": "d\/m\/Y",
-                    "return_format": "YY-MM-DD",
+                    "return_format": "c",
                     "first_day": 1
                 }
             ]