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How to set time timezone and synchronize system clock using timedatectl command
Do you know how to set Time, Timezone from Linux Command Line? If not, then the timedatectl command helps you to set time and Timezone and it comes as a part of systemd system and service manager. This article describes “How to Set Time, Timezone and Synchronize System Clock using timedatectl Command”
Find and Set Local Timezone in Linux
To display time and current date on Linux, use the following command –
$ timedatectl status
The sample output should be like this –
Local time: Fri 2016-03-11 11:23:54 IST Universal time: Fri 2016-03-11 05:53:54 UTC Timezone: Asia/Kolkata (IST, +0530) NTP enabled: yes NTP synchronized: no RTC in local TZ: no DST active: n/a
System time is managed through Timezone. To get Timezone of your system, use the following command –
$ timedatectl
The sample output should be like this –
Local time: Fri 2016-03-11 11:30:12 IST Universal time: Fri 2016-03-11 06:00:12 UTC Timezone: Asia/Kolkata (IST, +0530) NTP enabled: yes NTP synchronized: no RTC in local TZ: no DST active: n/a
To get the available timezones, use the following command –
$ timedatectl list-timezones
The sample output should be like this –
Africa/Abidjan Africa/Accra Africa/Addis_Ababa Africa/Algiers Africa/Asmara Africa/Bamako Africa/Bangui Africa/Banjul Africa/Bissau Africa/Blantyre Africa/Brazzaville Africa/Bujumbura Africa/Cairo Africa/Casablanca Africa/Ceuta Africa/Conakry Africa/Dakar Africa/Dar_es_Salaam Africa/Djibouti Africa/Douala .....................
To set your local timezone in Linux, use the following command-
$ timedatectl set-timezone “Asia/Kolkata”
To verify the above command result, use the following command –
$ timedatectl
The sample output should be like this –
Local time: Fri 2016-03-11 11:42:22 IST Universal time: Fri 2016-03-11 06:12:22 UTC RTC time: Fri 2016-03-11 11:42:29 Timezone: Asia/Kolkata (IST, +0530) NTP enabled: yes NTP synchronized: no RTC in local TZ: no DST active: n/a
To set our time zone according to UTF, use the following command –
$ timedatectl set-timezone UTC
To verify above command result, use the following command –
$ timedatectl
The sample output should be like this –
Local time: Fri 2016-03-11 06:15:58 UTC Universal time: Fri 2016-03-11 06:15:58 UTC Timezone: UTC (UTC, +0000) NTP enabled: yes NTP synchronized: no RTC in local TZ: no DST active: n/a
Set Time and Date
To set Time and Date, use the following command –
$ timedatectl set-time 15:58:30
To verify the above command result, use the following command –
$ timedatectl
The sample output should be like this –
Local time: Fri 2016-03-11 15:58:40 IST Universal time: Fri 2016-03-11 10:28:40 UTC Timezone: Asia/Kolkata (IST, +0530) NTP enabled: yes NTP synchronized: no RTC in local TZ: no DST active: n/a
To set date from command line, use the following command –
$ timedatectl set-time 2015-11-20
To verify the above command result, use the following command-
$ timedatectl
The sample output should be like this –
Local time: Fri 2015-11-20 00:00:06 IST Universal time: Thu 2015-11-19 18:30:06 UTC Timezone: Asia/Kolkata (IST, +0530) NTP enabled: yes NTP synchronized: no RTC in local TZ: no DST active: n/a To set both date and time, use the following command-
$ sudo timedatectl set-time "2014-11-08 06:40:00"
To verify the above command result, use the following command –
$ timedatectl
The sample output should be like this –
Local time: Sat 2014-11-08 06:40:11 IST Universal time: Sat 2014-11-08 01:10:11 UTC Timezone: Asia/Kolkata (IST, +0530) NTP enabled: yes NTP synchronized: no RTC in local TZ: no DST active: n/a
Set Hardware Clock in Linux
To Display Hardware Clock Date and Time, use the following command –
# hwclock
The sample output should be like this –
# hwclock Friday 11 March 2016 12:25:56 PM IST -0.594257 seconds
To copy system time to hardware time, use the following command-
# hwclock --systohc
To verify it, use the following commands-
# hwclock (for hardware date and time) # date (for system date and time)
The sample output should be like this –
# hwclock Friday 11 March 2016 01:53:03 PM IST -0.359815 seconds # date Fri Mar 11 13:53:05 IST 2016
In the above result, both hardware clock and system clock has the same result.
Synchronizing Linux System Clock with a Remote NTP Server
NTP stands for Network Time Protocol which is an internet protocol is used to synchronize approach clock between computers. The timedatectl utility makes it possible for to routinely sync your Linux system clock with remote servers utilizing NTP. To start automatic time synchronization with remote NTP server, use the following command-
# timedatectl set-ntp true
To disable NTP time synchronization, use the following command –
# timedatectl set-ntp false
Congratulations! Now, you know “How to Set Time, Timezone and Synchronize System Clock Using timedatectl Command”. We’ll learn more about these types of commands in our next Linux post. Keep reading!