mysql timestamp format

inc/mysqlmanager.php

@@ -10,6 +10,7 @@ class MySqlManager extends PhpObject
 	const DB_NO_CONN = 'ERR_1';
 	const DB_NO_DATA = 'ERR_2';
 	const ID_TAG = 'id_';
+	const MYSQL_TIMESTAMP = 'Y-m-d H:i:s';
 
 	public $sDbState;
 	private $bTrace;