Time Zone History

Papua New Guinea time zone history

Papua New Guinea has 2 zones of its own in the tz database. Standard times run from UTC+10 (Port Moresby) to UTC+11 (Bougainville), a spread of 1 hour.

2 zones · 0 with seasonal clock changes under the rules in tzdata 2026f · Convert a time

The 2 zones of Papua New Guinea since 1970

the zone’s standard time today1 hour behindthe zone’s standard time today1 hour behind

How to read this chart

197019801990200020102020BougainvillePort Moresby197019902010BougainvillePort Moresby

Zones at a glance

ZoneArea coveredStandard timeClock changes todayNew standard times since 1970
BougainvilleBougainvilleUTC+11no1
Port MoresbyPapua New Guinea (most areas)UTC+10no0

What sets each zone apart

  • Bougainville: The latest change of standard time came on December 28, 2014, from UTC+10 to UTC+11. Bougainville left local mean time (UTC+10:22:16) in 1880, the earliest switch of the 9 zones on UTC+11 standard time.
  • Port Moresby: Port Moresby left local mean time (UTC+9:48:40) in 1880, the earliest switch of the 9 zones on UTC+10 standard time with local mean time in the record.

How the zones compare with Port Moresby since 1970

  • Bougainville: same time as Port Moresby except 4,387 days in 2014–2026; 1 hour ahead today.

Every change of standard time since 1970

1 change across the 2 zones, oldest first.