ntpdate not updating system time in XenServer VM

We have a Debian webserver that I am trying to use ntpdate to keep the time in sync.

When I run

ntpdate ntp0.cs.mu.oz.au

I receive

16 Sep 10:55:36 ntpdate[21626]: step time server 128.250.36.2 offset 318.914011 sec

With no errors, which should be a good thing, I think...

When I check the time again though, it's not changed.

I am also unable to set the time manually using

date --set 11:00:00

So I have a feeling there are other issues.

Any advice would be appreciated.

Update

Sorry for the bum steer guys, this machine is a XenServer VM, which I managed to forget.

After updating the Host clock, the VM time is now correct.

Thanks for your replies. Thanks.

I have been through this before.

Try (on domU):

echo 1 > /proc/sys/xen/independent_wallclock

and try updating the time again.

Did the time change when you set the new time using date?

Try and check the machine hardware clock. (man hwclock)