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Cumulus Linux

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Setting the Date and Time

This section discusses how to set the time zone, and how to set the date and time on the software clock on the switch. To configure NTP, see Network Time Protocol - NTP. To configure PTP, see Precision Time Protocol - PTP.

Setting the time zone, and the date and time on the software clock requires root privileges; use sudo.

Show the Current Time Zone, Date, and Time

To show the current time zone, date, and time on the switch:

cumulus@switch:~$ nv show system time
                           operational                  
-------------------------  -----------------------------
llocal-time                 Wed 2024-08-21 17:39:44 EDT
universal-time             Wed 2024-08-21 21:39:44 UTC
rtc-time                   Fri 2024-08-16 16:50:06    
time-zone                  US/Eastern (EDT, -0400)    
system-clock-synchronized  no                         
ntp-service                n/a                        
rtc-in-local-tz            no                         
unix-time                  1724276384.1403222 

cumulus@switch:~$ date
Wed 11 Oct 2023 12:18:33 PM UTC

To show the time zone only, run the date +%Z command:

cumulus@switch:~$ date +%Z
UTC

Set the Time Zone

You can use one of these methods to set the time zone on the switch:

  • Run NVUE commands.
  • Use the guided wizard.
  • Edit the /etc/timezone file.

Run the nv set system timezone <timezone> command. To see all the available time zones, run nv set system timezone and press the Tab key. The following example sets the time zone to US/Eastern:

cumulus@switch:~$ nv set system timezone US/Eastern
cumulus@switch:~$ nv config apply

  1. In a terminal, run the following command:

    cumulus@switch:~$ sudo dpkg-reconfigure tzdata

  2. Follow the on screen menu options to select the geographic area and region.

For more information, see the Debian System Administrator's Manual - Time.

  1. Edit the /etc/timezone file to add your desired time zone. For a list of valid time zones, refer to tz database time zones.

    cumulus@switch:~$ sudo vi /etc/timezone
US/Eastern

  2. Apply the new time zone:

    cumulus@switch:~$ sudo dpkg-reconfigure --frontend noninteractive tzdata

  3. Change /etc/localtime to reflect your current time zone:

    sudo ln -sf /usr/share/zoneinfo/US/Eastern /etc/localtime

Set the Date and Time

The switch contains a battery backed hardware clock that maintains the time while the switch powers off and between reboots. When the switch is running, the Cumulus Linux operating system maintains its own software clock.

During boot up, the switch copies the time from the hardware clock to the operating system software clock. The software clock takes care of all the timekeeping. During system shutdown, the switch copies the software clock back to the battery backed hardware clock.

If you need to reconfigure the current time zone, refer to the instructions above.

To set the software clock according to the configured time zone:

Run the nv action change system time <clock-date> <clock-time> command. Specify <clock-date> in YYYY-MM-DD format and <clock-time> in HH:MM:SS format.

cumulus@switch:~$ nv action change system time 2023-12-04 2:33:30
System Date-time changed successfully
Local Time is now Mon 2023-12-04 02:33:30 UTC
Action succeeded

cumulus@switch:~$ sudo date -s "Tue Jan 26 00:37:13 2021"

You can write the current value of the software clock to the hardware clock using the hwclock command:

cumulus@switch:~$ sudo hwclock -w

See man hwclock(8) for more information.

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