diff --git a/config/sync/core.date_format.jj.yml b/config/sync/core.date_format.jj.yml
index 142c12b..7485ec5 100644
--- a/config/sync/core.date_format.jj.yml
+++ b/config/sync/core.date_format.jj.yml
@@ -5,4 +5,4 @@ dependencies: {  }
 id: jj
 label: JJ/MM/AAAA
 locked: false
-pattern: d-m-Y
+pattern: d/m/Y