查看時間
#查看系統時間 - 12 小時制
root@ubuntu20:/# date Wed 01 Sep 2021 11:51:26 PM CST
#查看系統時間 - 24 小時制
root@ubuntu20:/# date -R Wed, 01 Sep 2021 23:51:29 +0800
#查看硬件時間
root@ubuntu20:/# hwclock --show 2021-09-02 00:16:11.773346+08:00
root@ubuntu20:/#
時間自動更新設置
查看
root@ubuntu20:~# timedatectl show Timezone=Etc/UTC LocalRTC=no CanNTP=yes NTP=no NTPSynchronized=no TimeUSec=Thu 2021-09-02 00:08:33 CST RTCTimeUSec=Thu 2021-09-02 00:08:36 CST
root@ubuntu20:~#
NTP=no 表示時間的自動更新是關閉的
NTP=yes 表示時間的自動更新是開啟的
關閉
root@ubuntu20:~# timedatectl set-ntp no
root@ubuntu20:~# timedatectl show Timezone=Etc/UTC LocalRTC=no CanNTP=yes NTP=no NTPSynchronized=no TimeUSec=Thu 2021-09-02 00:12:00 CST RTCTimeUSec=Thu 2021-09-02 00:12:04 CST
root@ubuntu20:~#
打開
root@ubuntu20:~# timedatectl set-ntp yes
root@ubuntu20:~# timedatectl show Timezone=Etc/UTC LocalRTC=no CanNTP=yes NTP=yes NTPSynchronized=yes TimeUSec=Wed 2021-09-01 11:16:47 CST RTCTimeUSec=Wed 2021-09-01 11:16:46 CST
root@ubuntu20:~#
系統時區列表
timedatectl list-timezones
設置時區
sudo cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
時區文件目錄 /usr/share/zoneinfo
root@ubuntu20:/etc# cd /usr/share/zoneinfo root@ubuntu20:/usr/share/zoneinfo# ls Africa Asia Canada Cuba EST Factory GMT+0 Hongkong Iran Japan Libya MST NZ-CHAT posix right SystemV Universal W-SU America Atlantic CET EET EST5EDT GB GMT-0 HST iso3166.tab Kwajalein localtime MST7MDT Pacific posixrules ROC Turkey US zone1970.tab Antarctica Australia Chile Egypt Etc GB-Eire GMT0 Iceland Israel leapseconds MET Navajo Poland PRC ROK tzdata.zi UTC zone.tab Arctic Brazil CST6CDT Eire Europe GMT Greenwich Indian Jamaica leap-seconds.list Mexico NZ Portugal PST8PDT Singapore UCT WET Zulu
root@ubuntu20:/usr/share/zoneinfo# cd Asia root@ubuntu20:/usr/share/zoneinfo/Asia# ls Aden Ashkhabad Beirut Chungking Dushanbe Hovd Kamchatka Krasnoyarsk Makassar Oral Rangoon Singapore Thimbu Urumqi Yerevan Almaty Atyrau Bishkek Colombo Famagusta Irkutsk Karachi Kuala_Lumpur Manila Phnom_Penh Riyadh Srednekolymsk Thimphu Ust-Nera Amman Baghdad Brunei Dacca Gaza Istanbul Kashgar Kuching Muscat Pontianak Saigon Taipei Tokyo Vientiane Anadyr Bahrain Calcutta Damascus Harbin Jakarta Kathmandu Kuwait Nicosia Pyongyang Sakhalin Tashkent Tomsk Vladivostok Aqtau Baku Chita Dhaka Hebron Jayapura Katmandu Macao Novokuznetsk Qatar Samarkand Tbilisi Ujung_Pandang Yakutsk Aqtobe Bangkok Choibalsan Dili Ho_Chi_Minh Jerusalem Khandyga Macau Novosibirsk Qostanay Seoul Tehran Ulaanbaatar Yangon Ashgabat Barnaul Chongqing Dubai Hong_Kong Kabul Kolkata Magadan Omsk Qyzylorda Shanghai Tel_Aviv Ulan_Bator Yekaterinburg
root@ubuntu20:/usr/share/zoneinfo/Asia#
設置系統時間
#設置系統時間
date -s "2021-09-01 23:50:00"
#將系統時間同步到硬件時間
hwclock --systohc