HiK1000716: I'm with 2degrees and had to change my time manually. =[
Edit: I also had my phone set to get the time from the operator.
The time doesn't just automaticlaly update itself continually, I believe it only happens when the phone has to contact the HLR (which is something Salty briefly mentioned above). If your phone automatically changed to DST it was probably the phone firmware itself doing this. If you turned your phone off and on again and network time was enabled it would (or should) get the new time from the network.