CentOS修改时区以及同步时间

修改时区

## centos 7
timedatectl set-timezone "Asia/Shanghai"

or

## centos 6
cat /etc/sysconfig/clock
ZONE="Asia/Shanghai"

同步时间

/usr/sbin/ntpdate time-a.nist.gov && /sbin/hwclock -w

ref: http://blog.csdn.net/suer0101/article/details/7868813