[centos Stream 8][ubuntu 20.04] timedatectl 사용법

현재 상태 보기

$ timedatectl
               Local time: Tue 2022-07-12 10:05:32 KST
           Universal time: Tue 2022-07-12 01:05:32 UTC
                 RTC time: Tue 2022-07-12 01:05:33
                Time zone: Asia/Seoul (KST, +0900)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no

$ timedatectl status
               Local time: Tue 2022-07-12 10:05:35 KST
           Universal time: Tue 2022-07-12 01:05:35 UTC
                 RTC time: Tue 2022-07-12 01:05:36
                Time zone: Asia/Seoul (KST, +0900)
System clock synchronized: yes
              NTP service: active
          RTC in local TZ: no

$ timedatectl show
Timezone=Asia/Seoul
LocalRTC=no
CanNTP=yes
NTP=yes
NTPSynchronized=yes
TimeUSec=Tue 2022-07-12 10:05:37 KST
RTCTimeUSec=Tue 2022-07-12 10:05:38 KST

NTP 활성화/비활성화

## NTP service 활성화 (true, yes, on)
$ sudo timedatectl set-ntp true
$ timedatectl
              NTP service: active

## NTP service 비활성화 (false, no, off)
$ sudo timedatectl set-ntp false
$ timedatectl
              NTP service: inactive

타임존, 날짜, 시간 변경

## 타임존 변경
$ sudo timedatectl set-timezone Asia/Seoul

## 날짜 변경
$ sudo timedatectl set-time '2022-07-01'

## Local time 변경
$ sudo timedatectl set-time '01:23'