How to set custom time and date on virtual machine

If your virtual machine is managed by VirtualBox, there are 2 services which synchronize date and time. The first step is to stop them from restoring the time:

sudo service systemd-timesyncd stop
sudo service vboxadd-service stop

After that you can set time with date command, for example:

sudo date +%T -s "00:12:00"

or

date -s "27 OCT 2016 00:12:00"

or

date +%Y%m%d -s "20161027"