GMT-10 Time Zone Countries list - UTC-10 Time Now
Clocks on UTC−10 read ten hours earlier than Coordinated Universal Time. If UTC shows 20:00, local time is 10:00 on the same date. The main users — Hawaii, Tahiti and the Cook Islands — hold this offset all year.
UTC-10
Thursday, 3 September 2026
UTC−10 · Pacific/Honolulu
Shown for Pacific/Honolulu — one of the zones with this offset
- Offset: UTC-10
- Time zones with this offset: 4 (America/Adak, Pacific/Honolulu, Pacific/Rarotonga, Pacific/Tahiti)
- Daylight saving time: 1 of 4 zones here move the clock in summer, so their offset changes for part of the year.
Cities in UTC-10
- Honolulu United States
- East Honolulu United States
- Pearl City United States
- Waiau-Pacific Palisades United States
- Makakilo / Kapolei / Honokai Hale United States
- Kalihi-Palama United States
- Hilo United States
- Joint Base Pearl Harbor Hickam United States
- Aliamanu / Salt Lakes / Foster Village United States
- Kailua United States
- Waipahu United States
- ʻEwa Gentry-West Loch United States
Countries in UTC-10
Neighbouring offsets
World time zone map · All UTC offsets · Time by country
Where UTC−10 is the standard offset
Unlike most Pacific offsets, this one carries a genuinely busy set of places. Grouped by administration: Hawaii, United States — Honolulu, Hilo, Kailua-Kona, Kahului, Lihue. Labelled Hawaii-Aleutian Standard Time (HST).
French Polynesia — Papeete on Tahiti, plus Moorea, Bora Bora and the Tuamotu atolls. Cook Islands — Avarua on Rarotonga and the outer islands. Johnston Atoll — a US possession with no permanent population.
Between them, UTC−10 covers the largest population of any offset in the eastern Pacific, and every one of those places keeps a single reading from January to December.
The Aleutian exception
The zone's official US name includes the Aleutians for a reason. The far-western Aleutian Islands — Adak and its neighbours, west of roughly 169°30′W — share Hawaii's standard offset in winter but, unlike Hawaii, observe daylight saving. From the second Sunday in March to the first Sunday in November they move to UTC−9 as Hawaii-Aleutian Daylight Time.
So the honest summary is: UTC−10 is permanent in Hawaii and the tropical Pacific, and seasonal in a thin sliver of Alaska. Anyone writing scheduling code should treat "HST" as a label that mostly, but not always, means a fixed offset.
Planning calls with Hawaii and Tahiti
Because these clocks stay still, the difference you experience depends entirely on whether your own clocks have moved. Some anchors worth keeping in your head: Hawaii runs two hours behind US Pacific standard time, and three hours behind it in summer.
Hawaii runs five hours behind US Eastern standard time, and six in summer. Papeete and Honolulu share the offset exactly — no conversion needed between them. Rarotonga is one hour ahead of Niue and one hour behind the Marquesas.
Hawaii declined daylight saving for the least contentious reason available: near the tropics, the sun does not need any help staying up late. The practical consequence for anyone working with Honolulu from a mainland office is that the workable overlap shrinks by an hour every spring. A 4 p.m. call from New York lands at 11 a.m. in Honolulu in winter and 10 a.m. in summer — early, but survivable. Push it much later on the mainland side and you are asking someone to take a meeting before breakfast.
Questions and answers
- Does Hawaii ever change its clocks?
- No. Hawaii has stayed on UTC−10 without a seasonal shift for decades. Only the western Aleutians, which share the zone's name, switch.
- Are Tahiti and Hawaii really the same time?
- Yes, both keep UTC−10 year-round, so the local clock reads the same in Papeete and Honolulu even though the calendar date and the weather are quite different.
- What abbreviation should I use in writing?
- For clarity, write the offset: "10:00 (UTC−10)". HST is widely understood but ambiguous, since the Aleutian half of the zone does not stay on it all year.