Centos修改系统时间

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修改操作系统时间：
centos6：

$ cat /etc/sysconfig/clock 
ZONE="Asia/Shanghai"
UTC=false                          
ARC=false
$ ln -sf /usr/share/zoneinfo/Asia/Shanghai    /etc/localtime
$ ntpdate time.windows.com
$ /sbin/hwclock --systohc

$ cat /etc/sysconfig/clock

ZONE="Asia/Shanghai"

UTC=false

ARC=false

$ ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

$ ntpdate time.windows.com

$ /sbin/hwclock --systohc

centos7：

$ timedatectl set-timezone UTC  
$ timedatectl
      Local time: Wed 2018-04-11 01:31:16 UTC
  Universal time: Wed 2018-04-11 01:31:16 UTC
        RTC time: Wed 2018-04-11 01:31:16
       Time zone: UTC (UTC, +0000)
     NTP enabled: n/a
NTP synchronized: no
 RTC in local TZ: no
      DST active: n/a
$ timedatectl set-timezone Asia/Shanghai
$ timedatectl
      Local time: Wed 2018-04-11 09:33:37 CST
  Universal time: Wed 2018-04-11 01:33:37 UTC
        RTC time: Wed 2018-04-11 01:33:37
       Time zone: Asia/Shanghai (CST, +0800)
     NTP enabled: n/a
NTP synchronized: no
 RTC in local TZ: no
      DST active: n/a
$ timedatectl list-timezones    #列出所有时区
$ timedatectl set-local-rtc yes    #本地时间
$ timedatectl set-local-rtc no    #utc时间