We do not force time synchronisation on our products. However, the Windows on our VPS uses its own time synchronisation and you can do its settings as you can do it on any other PC running Windows.
If you wish to use a third party software for time synchronisation, like this one: https://www.meinbergglobal.com/english/sw/ntp.htm#ntp_stable, then your are free to do it for your own responsibility.
The download link of the monitoring program for the above software: https://www.meinbergglobal.com/english/sw/ntp-server-monitor.htm (with this monitoring program you can choose from a pool of different time servers and then sync your VPS clock for your own responsibility).