linux修改时区为东八时区，北京时间，上海时间

ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
echo "Asia/Shanghai" > /etc/timezone

CentOS

sudo yum install -y ntp
sudo systemctl enable ntpd
sudo ntpdate -q 0.rhel.pool.ntp.org
sudo systemctl restart ntpd

Debian/Ubuntu

sudo apt-get install -y ntp
sudo service ntp restart