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Linux Set Date and Time From a Command Prompt
Время создания: 29.09.2017 12:49
Текстовые метки: linux cli console date time set
Раздел: Linux
Запись: Velonski/mytetra-database/master/base/15066713812s53sjx23e/text.html на raw.githubusercontent.com
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How can I set the system date and time from the command prompt (bash shell)? I don’t have GUI installed and I am login over ssh session. How can I set date under Linux operating systems? Use the date command to display the current date and time or set the system date / time over ssh session. You can also run the date command from X terminal as root user. This is useful if the Linux server time and/or date is wrong, and you need to set it to new values from the shell prompt. You must login as root user to use date command. Linux Display Current Date and Time Just type the date command: $ date Sample outputs: Wed Apr 23 10:32:59 CDT 2014 Linux Display The Hardware Clock (RTC) Type the following hwclock command to read the Hardware Clock and display the time on screen: # hwclock -r OR # hwclock --show OR show it in Coordinated Universal time (UTC): # hwclock --show --utc Sample outputs: Wed 23 Apr 2014 10:36:23 AM CDT -0.157239 seconds Linux Set Date Command Example Use the following syntax to set new data and time: date --set="STRING" For example, set new data to 2 Oct 2006 18:00:00, type the following command as root user: # date -s "2 OCT 2006 18:00:00" OR # date --set="2 OCT 2006 18:00:00" You can also simplify format using following syntax: # date +%Y%m%d -s "20081128" Linux Set Time Examples To set time use the following syntax: # date +%T -s "10:13:13" Where, 10: Hour (hh) 13: Minute (mm) 13: Second (ss) Use %p locale’s equivalent of either AM or PM, enter: # date +%T%p -s "6:10:30AM" # date +%T%p -s "12:10:30PM" How do I set the Hardware Clock to the current System Time? Use the following syntax: # hwclock --systohc OR # hwclock -w A note about systemd based Linux system With systemd based system you need to use the timedatectl command to set or view the current date and time. Most modern distro such as RHEL/CentOS v.7.x+, Fedora Linux, Debian, Ubuntu, Arch Linux and other systemd based system need to the timedatectl utility. Please note that the above command should work on modern system too. timedatectl: Display the current date and time Type the following command: $ timedatectl Sample outputs: Fig.01: Systemd Linux timedatecetl command to display the current date and time Fig.01: Systemd Linux timedatecetl command to display the current date and time How do I change the current date using the timedatectl command? To change the current date, type the following command as root user: # timedatectl set-time YYYY-MM-DD OR $ sudo timedatectl set-time YYYY-MM-DD For example set the current date to 2015-12-01 (1st, Dec, 2015): # timedatectl set-time '2015-12-01' # timedatectl Sample outputs: Local time: Tue 2015-12-01 00:00:03 EST Universal time: Tue 2015-12-01 05:00:03 UTC RTC time: Tue 2015-12-01 05:00:03 Time zone: America/New_York (EST, -0500) NTP enabled: no NTP synchronized: no RTC in local TZ: no DST active: no Last DST change: DST ended at Sun 2015-11-01 01:59:59 EDT Sun 2015-11-01 01:00:00 EST Next DST change: DST begins (the clock jumps one hour forward) at Sun 2016-03-13 01:59:59 EST Sun 2016-03-13 03:00:00 EDT To change both the date and time, use the following syntax: # timedatectl set-time YYYY-MM-DD HH:MM:SS Where, HH : An hour. MM : A minute. SS : A second, all typed in two-digit form. YYYY: A four-digit year. MM : A two-digit month. DD: A two-digit day of the month. For example, set the date ’23rd Nov 2015′ and time to ‘8:10:40 am’, enter: # timedatectl set-time '2015-11-23 08:10:40' # date How do I set the current time only? The syntax is: # timedatectl set-time HH:MM:SS # timedatectl set-time '10:42:43' # date Sample outputs: Mon Nov 23 08:10:41 EST 2015 How do I set the time zone using timedatectl command? To see list all available time zones, enter: $ timedatectl list-timezones $ timedatectl list-timezones | more $ timedatectl list-timezones | grep -i asia $ timedatectl list-timezones | grep America/New To set the time zone to ‘Asia/Kolkata’, enter: # timedatectl set-timezone 'Asia/Kolkata' Verify it: # timedatectl Local time: Mon 2015-11-23 08:17:04 IST Universal time: Mon 2015-11-23 02:47:04 UTC RTC time: Mon 2015-11-23 13:16:09 Time zone: Asia/Kolkata (IST, +0530) NTP enabled: no NTP synchronized: no RTC in local TZ: no DST active: n/a How do I synchronizing the system clock with a remote server using NTP? Simply type the following command: # timedatectl set-ntp yes Verify it: $ timedatectl Sample outputs: Local time: Mon 2015-11-23 08:18:49 IST Universal time: Mon 2015-11-23 02:48:49 UTC RTC time: Mon 2015-11-23 02:48:50 Time zone: Asia/Kolkata (IST, +0530) NTP enabled: yes NTP synchronized: yes RTC in local TZ: no DST active: n/a See also: |
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