diff --git a/homeassistant/components/datetime/services.yaml b/homeassistant/components/datetime/services.yaml
index fb6f798e9bd..ddd733837a8 100644
--- a/homeassistant/components/datetime/services.yaml
+++ b/homeassistant/components/datetime/services.yaml
@@ -5,6 +5,6 @@ set_value:
   fields:
     datetime:
       required: true
-      example: "2022/11/01 22:15"
+      example: "2023-10-07T21:35:22"
       selector:
         datetime: