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 (needs sudo) a file /etc/cron.daily/ntpdate containing:
#!/bin/sh ntpdate ntp.ubuntu.com
Make sure that you make this new file executable:
sudo chmod 755 /etc/cron.daily/ntpdate
Source: https://help.ubuntu.com/community/UbuntuTime
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