We're back from Hawaii and it was great!

In arrival I had data switched off, and managed to get auto date and time on my phone within about ten minutes of landing.

Now we're back however I cannot get my phone to accept that we're not still in Hawaii. My partners moto g, also on 2degrees, was updated after about half an hour.

We're 12 hours back now and even if I manually set the time and date on my phone, then hit auto it reverts to Hawaiian time. I've tried airplane mode on and off and rebooting to get it registered on the network again but no joy as yet.

Any thoughts?