在MySQL数据库中设置了CURRENT_TIMESTAMP自动维护修改时间，但是获取到的时间比当前系统时间快一点是什么问题。

SELECT class,time_stamp FROM cf_status_log WHERE class like 'any' AND ( time_stamp BETWEEN now() AND ( timestamp with time zone '2013-12-22 17:33:25-0500' - interval '60' minute ) ) order by class ...