mysql日期类操作

1、date

2、datetime

3、函数

NOW():  当前时间，格式为 YYYYMMDD HHIISS 2013-03-06 16:58:22

FROM_UNIXTIME(timestamp): 将时间戳专为格式化的日期格式同上

DATE_FORMAT('2013-03-06 19:23:24','%Y-%m-%d %H:%i:%s'): 显示地将日期格式化，参数

update `demo` set day=SUBDATE(day,INTERVAL 2 DAY),daytime=UNIX_TIMESTAMP(SUBDATE(day,INTERVAL 2 DAY)) where userid=1;

update `demo` set day=SUBDATE(NOW(),INTERVAL 2 DAY),daytime=UNIX_TIMESTAMP(DATE_FORMAT(SUBDATE(NOW(),INTERVAL 2 DAY),'%Y-%m-%d')),logtime=SUBTIME(NOW(),'2 0:0:0') where userid=1;