timedatectl command on Linux (systemd timezone) [Basic Guide]

The timedatectl command on Linux is the tool that interacts with the Systemd service manager responsible for configuring of the Time Zone.

When executed without any parameters, it shows the Time Zone settings:

# timedatectl 
Local time: Sat 2019-10-19 12:07:48 -03 
Universal time: Sat 2019-10-19 15:07:48 UTC 
RTC time: Sat 2019-10-19 15:07:48

Time zone: America/Sao_Paulo (-03, 15:00)
Synchronized system clock: yes
NTP service: active
RTC in local TZ: no

It can also be used to list the available timezones:

# timedatectl list-timezones | grep America 
America/Adak 
America/Anchorage 
America/Anguilla 
America/Antigua 
(...) 

To change the Time Zone using timezonectl, simply use the “set-timezone” option followed by the name of the desired zone:

# timedatectl set-timezone America/Buenos Aires

And then restart the Systemd timezone service:

# systemctl restart systemd-timedated

Once this is done, the system date and time will change:

# timedatectl 
Local time: Sat 2019-10-19 12:13:15 -03 
Universal time: Sat 2019-10-19 15:13:15 UTC 
RTC time: Sat 2019-10-19 15:13:15

Time zone: America/Buenos_Aires (-03, 15:00)
Synchronized clock system: yes
NTP service: active
RTC in local TZ: no

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