Current Time in IANA Pacific/Bougainville Timezone
IANA Name: Pacific/Bougainville
Standard Offset: UTC +11:00
Daylight Saving: No
Currently Observing DST: No ❌
Pacific/Bougainville Time Zone: UTC+11:00 All Year
The Pacific/Bougainville time zone covers the Autonomous Region of Bougainville, an island region of Papua New Guinea. It uses a constant offset of UTC+11:00 with no daylight saving time, making it one of the few zones in the Pacific that stays fixed year-round.
Overview and Geography
Pacific/Bougainville applies to Bougainville Island and surrounding smaller islands, including Buka Island. This region is part of Papua New Guinea but has its own autonomous government. The zone's standard offset is UTC+11:00, which is 11 hours ahead of Coordinated Universal Time. The abbreviation commonly used is +11 or BST (Bougainville Standard Time), though official IANA designations do not include an abbreviation.
No Daylight Saving Time
Pacific/Bougainville does not observe daylight saving time. The offset remains UTC+11:00 throughout the year. This means there is no spring-forward or fall-back adjustment. The lack of DST is common in equatorial and tropical regions where daylight hours vary little. The zone's rhythm is constant, simplifying scheduling for residents and businesses.
Countries and Cities
The only country using Pacific/Bougainville is Papua New Guinea, specifically the Autonomous Region of Bougainville. The anchor city is Bougainville (the island's main urban area, often referred to as Buka or Arawa). Other notable locations include Buka Town and Arawa. The zone does not cover the rest of Papua New Guinea, which uses Pacific/Port_Moresby (UTC+10:00).
Comparison with Other Zones at UTC+11:00
Several other IANA zones share the same standard offset of UTC+11:00: Antarctica/Macquarie, Asia/Magadan, Asia/Sakhalin, Asia/Srednekolymsk, Australia/Hobart, Australia/Lord_Howe, Australia/Melbourne, Australia/Sydney, Pacific/Efate, Pacific/Guadalcanal, Pacific/Kosrae, and Pacific/Noumea. However, many of these zones observe daylight saving time (e.g., Australia/Hobart, Australia/Melbourne, Australia/Sydney, Australia/Lord_Howe). Pacific/Bougainville is one of the few that stays constant, along with Pacific/Guadalcanal (Solomon Islands) and Pacific/Efate (Vanuatu). This means during the southern hemisphere summer, Pacific/Bougainville may be an hour behind those Australian zones that spring forward.
Business Hours and Scheduling
For international coordination, Pacific/Bougainville is 11 hours ahead of UTC. Typical business hours (9:00 AM to 5:00 PM local time) correspond to 10:00 PM to 6:00 AM UTC the previous day. For example, when it is noon in Bougainville, it is 1:00 AM UTC. Overlap with North America is limited: Eastern Time (UTC-5) is 16 hours behind, so noon in Bougainville is 8:00 PM the previous day in New York. With Asia, Tokyo (UTC+9) is 2 hours behind, so noon in Bougainville is 10:00 AM in Tokyo. With Australia, Sydney (UTC+10 or +11) is usually 1 hour behind or the same during DST. Check current offsets for precise scheduling.
Practical Guidance
When calling Bougainville from a location that observes DST, remember that the time difference may shift seasonally. For example, from Sydney (AEDT, UTC+11), the difference is zero during Sydney's summer but becomes +1 hour when Sydney reverts to AEST (UTC+10). Always verify current offsets using a reliable world clock. Pacific/Bougainville is ideal for those who prefer a stable time without biannual clock changes.
Frequently Asked Questions
Does Pacific/Bougainville observe daylight saving time?
No, Pacific/Bougainville does not observe daylight saving time. The offset is UTC+11:00 all year round.
What is the time difference between Bougainville and New York?
Bougainville is 16 hours ahead of New York during Eastern Standard Time (UTC-5) and 15 hours ahead during Eastern Daylight Time (UTC-4). For example, when it is noon in Bougainville, it is 8:00 PM the previous day in New York (EST).
Is Bougainville in the same time zone as the rest of Papua New Guinea?
No, Bougainville uses UTC+11:00, while the rest of Papua New Guinea uses Pacific/Port_Moresby at UTC+10:00. So Bougainville is one hour ahead of Port Moresby.
What countries use the same time zone as Pacific/Bougainville?
Only Papua New Guinea (Autonomous Region of Bougainville) uses this zone. However, other zones at the same offset include parts of Australia, Russia, Solomon Islands, Vanuatu, and others, but they may observe DST.
What is the abbreviation for Pacific/Bougainville time?
Commonly it is called +11 or Bougainville Standard Time (BST), but there is no official IANA abbreviation. It is often referred to as UTC+11.
How do I schedule a call with someone in Bougainville from London?
London is UTC+0 in winter and UTC+1 in summer (BST). Bougainville is UTC+11. So the difference is 11 hours in winter (e.g., noon in Bougainville is 1:00 AM in London) and 10 hours in summer (noon in Bougainville is 2:00 AM in London). Best overlap for business is around 8:00 AM to 10:00 AM in Bougainville, which is 10:00 PM to midnight in London (winter) or 11:00 PM to 1:00 AM (summer).