diff --git a/admin/admin.el b/admin/admin.el
index 3906dd8d63c..4bd19ea1d92 100644
--- a/admin/admin.el
+++ b/admin/admin.el
@@ -955,7 +955,7 @@ $Date: %s $
             (format admin--org-html-postamble
                     copyright-years
                     ;; e.g. "2022/09/13 09:13:13"
-                    (format-time-string "%Y/%M/%y %H:%m:%S")))
+                    (format-time-string "%Y/%m/%d %H:%m:%S")))
            (org-html-mathjax-template "")
            (htmlize-output-type 'css))
       (org-html-export-as-html))