Papua New Guinea's autonomous region of Bougainville has moved its clocks forward by one hour to establish a new time zone.
The Bougainville House of Representatives agreed in September to adopt what it calls Bougainville Standard Time.
The new time zone is 11 hours ahead of Co-ordinated Universal Time, which means that Bougainville will be one hour ahead of the rest of Papua New Guinea.
PNG Loop reports that Bougainville's Minister for Commerce and Tourism told the House of Representatives in September that Bougainville was disadvantaged by being part of the National Time Zone.
The time zone changed over in the early hours of Sunday morning.
Bougainville will now be in the same time zone as Solomon Islands.