Ubuntu Server Keep Time Updated

According to the Ubuntu 16.04 document: Time Synchronisation with NTP. System time is automaticlly synchronized using timedatectl and timesyncd. Users do not need to worry about this.

system time status

timedatectl

shows the system time status like this

      Local time: Sat 2016-11-19 13:45:20 CET
  Universal time: Sat 2016-11-19 12:45:20 UTC
        RTC time: Sat 2016-11-19 12:45:20
       Time zone: Europe/Berlin (CET, +0100)
 Network time on: yes
NTP synchronized: no
 RTC in local TZ: no

change system timezone

sudo timedatectl set-timezone {{ timezone.value }} 

change system timezone (interactively)

sudo dpkg-reconfigure tzdata

Time Synchronization

sudo timedatectl set-ntp on