One of our Debian servers had a large time discrepancy. Turned out NTP wasn’t installed or working.

After I installed ntp I still wasn’t seeing a time update. Probably because I was more than 30 minutes adrift. So I had to force an ntp update.

Install ntp and set the servers in the .conf to match your ntp servers.

$ sudo apt-get install ntp
$ sudo vi /etc/ntp.conf

Then force a time update

$ sudo systemctl stop ntp.service
$ sudo ntpd -gq
$ sudo systemctl start ntp.service

The ntpd may take a while before dropping you back to the prompt.

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