diff --git a/library/includes/ucp/register.php b/library/includes/ucp/register.php
index 53d5bae2b..62f1f7ed0 100644
--- a/library/includes/ucp/register.php
+++ b/library/includes/ucp/register.php
@@ -142,6 +142,7 @@ switch ($mode) {
         if (!$pr_data = DB()->fetch_row($sql)) {
             bb_die($lang['PROFILE_NOT_FOUND']);
         }
+        $pr_data['user_birthday'] = $pr_data['user_birthday']->format('Y-m-d');
         if (IN_DEMO_MODE && isset($_COOKIE['user_lang'])) {
             $pr_data['user_lang'] = $_COOKIE['user_lang'];
         }