Command Line ntpdate
Ubuntu comes with ntpdate as standard, and will run it once at boot time to set up your time according to Ubuntu's NTP server. However, a system's clock is likely to drift considerably between reboots if the time between reboots is long. In that case it makes sense to correct the time occasionally. The easiest way to do this is to get cron to run it every day. With your favorite editor, create a file /etc/cron.daily/ntpdate containing:
sudo ntpdate ntp.ubuntu.com
Make sure that you make this new file executable:
sudo chmod 755 /etc/cron.daily/ntpdate
You can stop ntpd by executing:
Then set the system clock:sudo /etc/init.d/ntp stop
And then start ntpd up again:sudo ntpdate ntp.ubuntu.com
sudo /etc/init.d/ntp start
Change the time location
dpkg-reconfigure tzdata
