Time Zone History

Bougainville time zone history

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.

UTC+11

Standard time is UTC+11 all year under the current rules.

Covers: Bougainville · tz database name Pacific/Bougainville

Convert a time from Bougainville

Once a new standard time since 1970

UTC+9: 2 hours behind today’s standard timeUTC+9:48:32, UTC+10: behind today’s standard timeUTC+10:22:16: 38 minutes behind today’s standard timeUTC+11: today’s standard timeUTC+9: 2 hours behind today’sstandard timeUTC+9:48:32, UTC+10: behindtoday’s standard timeUTC+10:22:16: 38 minutes behindtoday’s standard timeUTC+11: today’s standard time

How to read this chart

Before 1970

187018901910193019501970187019101950
JanFebMarAprMayJunJulAugSepOctNovDec1970198019902000201020202028JFMAMJJASOND1970198019902000201020202028

Standard time changes

DateChangeNew standard timeClock label
Before 1970
January 1, 1880Local mean time (UTC+10:22:16) replacedUTC+9:48:32PMMT
January 1, 1895Standard time forward 11 minutesUTC+10numeric only
July 1, 1942Standard time back 1 hourUTC+9numeric only
August 21, 1945Standard time forward 1 hourUTC+10numeric only
Since 1970
December 28, 2014Standard time forward 1 hourUTC+11numeric only

Also on UTC+11

Solomon Islands, Micronesia, Vanuatu, New Caledonia, Norfolk Island, Sakhalin (Russia), Magadan (Russia) and Srednekolymsk (Russia).

Clocks next door since 1970

  • Solomon Islands (630 km): usually 1 hour ahead; different on 4,387 days in 2014–2026; same time today.
  • Port Moresby (995 km): same time except 4,387 days in 2014–2026; 1 hour behind today.
  • Nauru (1,410 km): usually 2 hours ahead; different on 7,714 days in 1970–1979 and 2014–2026; 1 hour ahead today.
  • Micronesia (1,524 km): usually 2 hours ahead; different on 10,228 days in 1998–2026; same time today.
  • Jayapura (Indonesia) (1,698 km): usually 1 hour behind; different on 4,387 days in 2014–2026; 2 hours behind today.

How it compares

On standard time, clocks in Bougainville run 38 minutes ahead of local mean solar time.