====== NTP on Linux =======
Ubuntu 20.04

Show time and timezones
<code>sudo timedatectl</code>
List available timezones
<code>sudo timedatectl list-timezones</code>
Set timezone
<code>sudo timedatectl set-timezone Europe/London</code>
To view the current time and date, run the following command.
<code>date</code>
To set the time manually, use the following command (substitute letters to numbers as appropriate).
<code>date MMDDhhmmYYYY</code>
To tell the machine to sync with a time server to get the latest time, use the following command.
<code>ntpdate pool.ntp.org</code>
The time daeomon on CentOS is called ntpd. To install the ntpd daemon, run the following as root.
<code>yum -y install ntpd</code>
To ensure it runs on start up, run the following as root.
<code>chkconfig ntpd on</code>
To manually start ntpd, run the following as root.
<code>service ntpd start</code>
If the machine is a Linux VM in VirtualBox running on a Windows host and you want to set the time to some date in the future, you will need to prevent the VM automatically correcting the time. Shut the VM down and run this command in the Windows host.
<code>vboxmanage setextradata MACHINENAME "VBoxInternal/Devices/VMMDev/0/Config/GetHostTimeDisabled" "1"</code>]