diff --git a/System/Core/No.php b/System/Core/No.php
new file mode 100644
index 00000000..248eb1d8
--- /dev/null
+++ b/System/Core/No.php
@@ -0,0 +1,22 @@
+<?php
+
+
+namespace Snowflake\Core;
+
+
+class No
+{
+
+
+    /**
+     * @param int $userId
+     * @return string
+     */
+    public static function order(int $userId): string
+    {
+        $explode = current(explode(' ', str_replace('0.', '', microtime())));
+
+        return 'No.' . sprintf('%09d', $userId) . '.' . date('Ymd.His') . '.' . $explode;
+    }
+
+}