修改时区为上海

[root@localhost ~]# date       
Mon Apr  8 09:45:02 EDT 2019
[root@localhost ~]#  mv /etc/localtime /etc/localtime.bak
[root@localhost ~]# ln -s /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
[root@localhost ~]# date
Mon Apr  8 21:58:11 CST 2019