
If you click on 'Profile' - aka edit your personal forum profile - you'll see a field near the bottom that defines 'Timezone'.
This is user-configurable as we don't know where in the world you're browsing from. (Ok, NZ is a fair assumption, but we have browsers from overseas too!)
This defaults to GMT + 12 in most circumstances.
When daylight savings happens, in order to get the time to display right you need to change this to GMT + 13.
Likewise when we undo daylight savings, you need to change this back.
You can choose to have it display GMT all the time; you can have it on NZ Standard Time all the time, or you can tweak it when we set our clocks back or forward. Your call.
Cheers
BJ.