24小时表示方法：to_date(’2004-06-30 23:59:59’,’yyyy-mm-dd hh24:mi:ss’)12小时表示方法：to_date(’2004-06-30 23:59:59’,’yyyy-mm-dd hh:mi:ss’)  insert into settle_white values('15','S7551581',to_date('2016-04-12 20:20:59','yyyy-mm-dd hh24:mi:ss'),to_date('2016-04-12 20:20:59','yyyy-mm-dd hh24:mi:ss'),'0','1',sysdate,sysdate,'aaa');   update settle_white t SET t.start_tm = to_date('2016-04-12 20:50:59','yyyy-mm-dd hh24:mi:ss'),t.end_tm = to_date('2016-04-12 20:50:59','yyyy-mm-dd hh24:mi:ss')  where t.white_id = 'FC7551581';  -- 查询当前时间 select to_char(sysdate,'yyyy-MM-dd HH24:mi:ss') from dual;