mysql时间字段加减

update 20210406 set recordTime=date_add(recordTime,INTERVAL -5 hour) where id>2;

update 20210406 set recordTime=date_add(recordTime,INTERVAL -5 minute) where id>2;

update 20210406 set recordTime=date_add(recordTime,INTERVAL -5 second) where id>2;

参考：https://www.cnblogs.com/chuanzhang053/p/9228798.html