Clocks in Papua New Guinea's Bougainville are to be put forward by one hour from December the 28th.
Bougainville is an autonomous region and has been granted an increasing number of powers by the national government in Port Moresby over the past year.
It will be the first occasion that PNG has been split into different time zones.
Our correspondent says the change means Bougainville will be in the same time zone as its near neighbour and trading partner, Solomon Islands.
