Gigaset cordless - call lists have wrong time on all calls

I've got a Siemens Gigaset S795 base with 6 x S79H handsets. The handsets have a menu to view details of previous and missed calls etc. The times of missed or received calls are reported with the wrong time on them - it's a certain number of hours out each time eg if I had a call at 12 noon it'd be reported as being at 6am.

The time is set correctly on the handsets and there's no way to set any such info on the base. 

I'm wondering if this time is set by the phone network or by the phone itself. I use Voipfone by the way. Any ideas?
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