Running your own rdate or ntp clients
From OneNode Wiki
OneNode sets up all of their nodes to run on accurate UTC time.
As a user, you can either use the main server's time or be able to change the date inside your VPS by running your own rdate or ntp clients. To do so you will need to run:
echo 1 > /proc/sys/xen/independent_wallclock
Or add this into /etc/sysctl.conf:
xen.independent_wallclock = 1
This will disconnect the xen hardware clock, so you can control the time yourself.