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"

fedora: Install latest VirtualBox

The latest virtualbox can be installed from the Oracle repository. First of all we need to install oracle repository:

cd /etc/yum.repos.d/
sudo wget http://download.virtualbox.org/virtualbox/rpm/fedora/virtualbox.repo

Install dependencies:

sudo dnf install binutils gcc make patch libgomp glibc-headers glibc-devel kernel-headers kernel-PAE-devel dkms

Install virtualbox. Note: pointing 5.1 is important as at the moment that is how it is called in the oracle's repository:

sudo dnf install VirtualBox-5.1

You might need to rebuild kernel modules with command:

sudo /usr/lib/virtualbox/vboxdrv.sh setup

And add current user to the xboxusers group:

sudo usermod -a -G vboxusers user_name

I had a problem reconfiguring kernel modules on my laptop. The error wasn't indicating anything specific. The problem was in the BIOS settings. Secure Boot should be disabled to allow module reconfiguration.