タイムゾーンと時間の設定

現在の時刻とタイムゾーンの表示

#       ，           
$ timedatectl
      Local time:   2019-12-26 05:52:36 EST
  Universal time:   2019-12-26 10:52:36 UTC
        RTC time:   2019-12-26 10:52:36
       Time zone: America/New_York (EST, -0500)
     NTP enabled: no
NTP synchronized: yes
 RTC in local TZ: no
      DST active: no
 Last DST change: DST ended at
                    2019-11-03 01:59:59 EDT
                    2019-11-03 01:00:00 EST
 Next DST change: DST begins (the clock jumps one hour forward) at
                    2020-03-08 01:59:59 EST
                    2020-03-08 03:00:00 EDT

  中国所在時区に設置

#       
$ timedatectl list-timezones

#     
$ timedatectl set-timezone Asia/Shanghai

  使用NTP校正時間

$ ntpdate -u time1.aliyun.com

#         ，      ，       
$ timedatectl
      Local time:   2019-12-26 18:57:33 CST
  Universal time:   2019-12-26 10:57:33 UTC
        RTC time:   2019-12-26 10:57:33
       Time zone: Asia/Shanghai (CST, +0800)
     NTP enabled: no
NTP synchronized: yes
 RTC in local TZ: no
      DST active: n/a