Change date on an OpenVZ VPS

I have a cheap OpenVZ VPS, and I noticed the time is a lot wrong. Each time I try: ntpdate -s time.nist.gov it silently returns as if it was successful, but nothing changes. When I do: date -s 11:11 it says date: cannot set date: Operation not permitted. **Is there a trick to be able to modify date on an OpenVZ VPS?** Note: I have done service ntpd stop, but it's already not running.