date

发表于 更新于

date 命令

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[root@ClockworkMonkey ~]# date
Tue Mar 29 22:58:19 CST 2022

时区

  • UTC：世界标准时间
  • GMT：格林威治标准时间
  • CST：中国标准时间，GMT + 8 = UTC + 8 = CST

格式

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%F：显示年月日
%y：年份的最后两位数字，范围是00 ~ 99
%Y：年份
%m：月份，范围01 ~ 12
%d：当前是几号，按月计算的日期
%M：分钟
%H：小时
%S：秒
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[root@ClockworkMonkey ~]# date "+%F"
2022-03-29
[root@ClockworkMonkey ~]# date "+%Y%m%d"
20220329
[root@ClockworkMonkey ~]# date "+%Y-%m-%d %H:%M:%S"
2022-03-29 23:00:41

修改系统时间

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[root@ClockworkMonkey ~]# date -s "2019-09-09 09:09:09"
Mon Sep  9 09:09:09 CST 2019

timedatectl 命令

timedatectl

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[root@ClockworkMonkey ~]# timedatectl
      Local time: Mon 2019-09-09 09:10:00 CST
  Universal time: Mon 2019-09-09 01:10:00 UTC
        RTC time: Tue 2022-03-29 15:02:24
       Time zone: Asia/Shanghai (CST, +0800)
     NTP enabled: no
NTP synchronized: no
 RTC in local TZ: no
      DST active: n/a

timedatectl set-timezone Asia/Shanghai

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[root@ClockworkMonkey ~]# timedatectl set-timezone Asia/Shanghai

NTP

安装 ntpdate

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[root@ClockworkMonkey ~]# yum install ntpdate
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
Package ntpdate-4.2.6p5-29.el7.centos.2.x86_64 already installed and latest version
Nothing to do

同步时间

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root@localhost [10:27:41 AM] [~] 
-> # ntpdate cn.pool.ntp.org
29 Apr 10:27:55 ntpdate[62380]: adjust time server 124.108.20.1 offset -0.000588 sec
root@localhost [10:27:55 AM] [~] 
-> # ntpdate -u cn.pool.ntp.org
29 Apr 10:28:08 ntpdate[62383]: adjust time server 119.28.206.193 offset 0.002792 sec

开机启动

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root@localhost [10:28:08 AM] [~] 
-> # systemctl status ntpdate
● ntpdate.service - Set time via NTP
   Loaded: loaded (/usr/lib/systemd/system/ntpdate.service; disabled; vendor preset: disabled)
   Active: inactive (dead)
root@localhost [10:31:08 AM] [~] 
-> # systemctl start ntpdate
root@localhost [10:31:28 AM] [~] 
-> # systemctl status ntpdate
● ntpdate.service - Set time via NTP
   Loaded: loaded (/usr/lib/systemd/system/ntpdate.service; disabled; vendor preset: disabled)
   Active: active (exited) since Thu 2021-04-29 10:31:28 CST; 2s ago
  Process: 62427 ExecStart=/usr/libexec/ntpdate-wrapper (code=exited, status=0/SUCCESS)
 Main PID: 62427 (code=exited, status=0/SUCCESS)

Apr 29 10:31:23 localhost.localdomain systemd[1]: Starting Set time...
Apr 29 10:31:28 localhost.localdomain systemd[1]: Started Set time ...
Hint: Some lines were ellipsized, use -l to show in full.

root@localhost [10:31:43 AM] [~]
-> # systemctl enable ntpdate
Created symlink from /etc/systemd/system/multi-user.target.wants/ntpdate.service to /usr/lib/systemd/system/ntpdate.service.
root@localhost [10:31:58 AM] [~] 
-> # systemctl status ntpdate
● ntpdate.service - Set time via NTP
   Loaded: loaded (/usr/lib/systemd/system/ntpdate.service; enabled; vendor preset: disabled)
   Active: active (exited) since Thu 2021-04-29 10:31:28 CST; 41s ago
 Main PID: 62427 (code=exited, status=0/SUCCESS)

Apr 29 10:31:23 localhost.localdomain systemd[1]: Starting Set time...
Apr 29 10:31:28 localhost.localdomain systemd[1]: Started Set time ...
Hint: Some lines were ellipsized, use -l to show in full.

参考

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[root@nginx02 ~]# ntpdate cn.pool.ntp.org
 1 Apr 11:06:48 ntpdate[1516]: step time server 84.16.67.12 offset -28798.752783 sec
[root@nginx02 ~]# systemctl status ntpdate
● ntpdate.service - Set time via NTP
   Loaded: loaded (/usr/lib/systemd/system/ntpdate.service; disabled; vendor preset: disabled)
   Active: inactive (dead)
[root@nginx02 ~]# systemctl start ntpdate
[root@nginx02 ~]# systemctl status ntpdate
● ntpdate.service - Set time via NTP
   Loaded: loaded (/usr/lib/systemd/system/ntpdate.service; disabled; vendor preset: disabled)
   Active: active (exited) since Fri 2022-04-01 11:07:20 CST; 1s ago
  Process: 1524 ExecStart=/usr/libexec/ntpdate-wrapper (code=exited, status=0/SUCCESS)
 Main PID: 1524 (code=exited, status=0/SUCCESS)

Apr 01 11:07:17 nginx02.centos.gg systemd[1]: Starting Set time via NTP...
Apr 01 11:07:20 nginx02.centos.gg systemd[1]: Started Set time via NTP.
[root@nginx02 ~]# systemctl enable ntpdate
Created symlink from /etc/systemd/system/multi-user.target.wants/ntpdate.service to /usr/lib/systemd/system/ntpdate.service.