IANA tz database · zone identifier

Pacific/Bougainville

The IANA tz database identifier for Bougainville Time in Papua New Guinea. Store this string — not the abbreviation, not the offset — and your timestamps stay correct forever.

UTC+11:00Abbreviation +11No DST — never observed
Time in Pacific/Bougainville☀ Daylight
10:00:38
Thursday, July 16, 2026
Offset
UTC+11:00
Abbreviation
+11
DST
No DST

Current offset

UTC+11:00

same year-round

Abbreviation

+11

tzdb uses numeric abbreviations here

DST behaviour

Never

has never observed daylight saving

Country

🇵🇬 Papua New Guinea

ISO 3166: PG · view country page →

Using this identifier

The string to put in your code.

Pacific/Bougainville is the identifier to use in code and config for this region. Every modern language, database, and OS resolves it through the same tz database, so the examples here behave identically everywhere.

Avoid storing +11 or +11:00 — abbreviations are ambiguous and fixed offsets can't follow rule changes.

// format a date in this zone
new Intl.DateTimeFormat('en-US', {
timeZone: 'Pacific/Bougainville',
dateStyle: 'full', timeStyle: 'long'
}).format(new Date());

Offset & DST behaviour

One offset,
11 years.

Pacific/Bougainville has kept UTC+11:00 year-round since 28 December 2014 — no daylight saving and no offset changes on record since. It is among the most stable identifiers in the database.

Every offset this zone has kept

+10:22:16UTC+11:00 · UNCHANGED 28 December 2014 NOW

Keeping this offset since

28 December 2014

Next transition

None scheduled

no DST rules exist for this zone

Safe to assume

Local = UTC + 11h, always

…but store the identifier anyway

Technical record

The database entry, in full.

source: IANA tz database

IdentifierPacific/Bougainville
ISO country codePG🇵🇬 Papua New Guinea
Reference coordinates6.22°S, 155.57°Etz database reference point
Standard offsetUTC+11:00abbreviation +11
Daylight offset—daylight saving has never been observed

Where it applies

One of Papua New Guinea's 2 zones.

🇵🇬
Papua New Guinea

8.9M people, 2 time zones — this identifier covers one of them.

Country page →

Related identifiers

Nearby in the database.

Same offset · UTC+11:00

other zones keeping this offset right now

Frequently asked questions

Answers specific to this identifier — generated from the database record. Can't find what you need? Email [email protected].

What UTC offset is Pacific/Bougainville?
Pacific/Bougainville is UTC+11:00, year-round. The offset never changes because the zone does not observe daylight saving time.
Does Pacific/Bougainville observe daylight saving time?
No. Pacific/Bougainville has never observed DST — it has kept UTC+11:00 continuously since 28 December 2014.
Which country uses Pacific/Bougainville?
Papua New Guinea. It is one of 2 IANA zones covering the country.
Is Pacific/Bougainville the same as BOUGAI?
Pacific/Bougainville is one of the IANA zones that keeps Bougainville Time (BOUGAI). Use Pacific/Bougainville in software — BOUGAI is a human-friendly label, not a valid identifier.

Free · Developer API

This zone, as JSON.

Everything on this page — offset, abbreviation, DST rules, coordinates — from one endpoint, always current with the latest tzdb release.

GET /v1/timezones Live

countries, cities, convert, DST transitions coming next.

Get your free API key →
// this identifier, resolved live
GET /v1/timezones?iana=Pacific/Bougainville
{
"iana": "Pacific/Bougainville",
"utc_offset": "+11:00",
"abbreviation": "+11",
"observes_dst": false,
"country": "PG"
}