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Do not run this command if you already have ntpd running!
This needs to run as root, for example with sudo:
sudo ntpdate pool.ntp.org && sudo hwclock --systohc && sudo hwclock --adjust
This command will fetch accurate time from NTP servers and synchronize your system clock, then it will use the system clock to synchronize your hardware clock, and will calculate the time drift.
There are 3 alternatives - vote for the best!
If you can do better, submit your command here.
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A little correction to the command, the correct address is pool.ntp.org .
Thanks sunny256, I just modified it :)