Timezone abbreviation
HAST currently resolves here through Pacific/Honolulu, where the live offset is -10:00 (HST). This page expands that into the broader meaning set, top cities, countries, similar labels, and safer exact-zone equivalents.
Representative zones, offset ranges, and city usage are refreshed from the current timezone dataset so abbreviation pages stay tied to real zones instead of static boilerplate.
HAST is a North or South American civil-time label, currently 10h behind UTC at -10:00. The label covers 2 IANA zones across 1 country, with Honolulu as the busiest live reference.
The busiest cities using HAST in the current catalog are Honolulu, East Honolulu, Pearl City, Makakilo / Kapolei / Honokai Hale, and Kalihi-Palama. The lead live reference on this page is Honolulu (Pacific/Honolulu), currently at -10:00 (HST). Those cities are what give HAST its actual feel rather than the abstract offset.
HAST is stable on Pacific/Honolulu year-round, with no seasonal clock changes in the next year. That makes it a low-friction choice for recurring meetings and broadcast schedules — but software still prefers the IANA zone because governments can change civil-time rules independently of the short code.
Live reference
Pacific/Honolulu
Current offset
-10:00 (HST)
Meanings / zones / countries
1 / 2 / 1
Offset range
UTC-10:00 to UTC-09:00
HAST is a US Pacific or Mountain band offset, so it is read more from western North America than from anywhere else. In practice it is read inside Atlantic, Pacific, or Indian Ocean island cluster, where the leading city anchors are Honolulu, United States, East Honolulu, United States, and Pearl City, United States.
HAST resolves cleanly in the current dataset, with one dominant meaning across 2 zones and 1 country group.
HAST shows up on airline schedules, weather bulletins, and Pacific shipping notices more than on office calendars. HAST stays on a single offset year-round in the current data, which simplifies its operational use.
Zone family, representative city, current offset, country coverage, and nearby abbreviation context for HAST.
Primary zone
Pacific/Honolulu
Live offset
-10:00 · HST
Region family
Atlantic, Pacific, or Indian Ocean island cluster
Meaning count
1 meaning
Zone / country reach
2 zones · 1 countries
Representative city
Honolulu, United States
Country anchor
United States
DST posture
No upcoming seasonal clock change detected in the representative zone
Offset range
UTC-10:00 to UTC-09:00
Data fingerprint
This compact fingerprint is intentionally specific: exact zone IDs, place anchors, country anchors, transition cues, and offset peers. It gives humans and crawlers concrete reasons not to collapse HASTinto another abbreviation with the same clock hour.
Route identity
hast · HAST · Hawaii-Aleutian Time · Pacific/Honolulu
Exact IANA zone set
Pacific/Honolulu and America/Adak
Place anchors
Honolulu, United States, East Honolulu, United States, and Pearl City, United States
Country anchors
United States (Pacific/Honolulu, America/Adak)
Transition fingerprints
Pacific/Honolulu: no next-year switch and America/Adak: HAST-HADT on March 14, 2027
Offset peers to verify
CKT (Pacific/Rarotonga), HADT (America/Adak), TAHT (Pacific/Tahiti)
Abbreviation dossier
These checks separate the abbreviation from lookalike labels and same-offset codes: the representative IANA zone, the current civil-time reading, the city/country footprint, and whether the lead zone has an upcoming clock change.
Primary live reading
Hawaii-Aleutian Time resolves through Pacific/Honolulu right now: -10:00 (HST).
Ambiguity status
HAST maps to one meaning in this catalog, but the IANA zone still matters because clock-change rules live on the zone, not the short code.
DST and transition posture
Pacific/Honolulu has no scheduled offset switch in the next year in this snapshot.
Country and city reach
HAST is represented across 1 country, 2 IANA zones, and lead cities including Honolulu, United States, East Honolulu, United States, and Pearl City, United States.
Same-offset caution
HAST and HADT currently share -10:00, but they point at different civil-time labels, cities, countries, and source contexts. Treat the matching offset as arithmetic only, not semantic equivalence.
Editorial check
Hawaii-Aleutian reading: Use Pacific/Honolulu for Hawaii clocks.
Precision layer
Timezone abbreviations are useful display labels, but they are weak storage keys. This register shows the exact risks for HAST: ambiguity, seasonal changes, same-offset neighbors, and the safer value to store in software, calendars, or operations notes.
Abbreviation ambiguity risk
LowHAST has one meaning in this catalog, but the zone and country context still carry the legal-time rule.
Seasonal clock-change risk
LowPacific/Honolulu is stable for the next-year transition scan, so the main risk is policy change or same-offset confusion.
Same-offset confusion risk
Medium3 other abbreviation pages currently share -10:00; the same clock hour is not the same civil-time context.
Storage recommendation
Use exact zoneStore Pacific/Honolulu or a UTC instant. Display HAST only as a human-facing label after the exact zone is known.
Coverage breadth
2 zonesHAST covers 2 IANA zones and 1 country grouping in this page's retained dataset.
Four fixed UTC checkpoints expose whether HAST crosses a local date boundary in Pacific/Honolulu. This is the practical difference between a harmless clock conversion and a deadline, release, travel, or reporting mistake.
HAST moves this checkpoint to the previous local date in Pacific/Honolulu, which matters for reports, releases, travel, and deadline wording.
HAST moves this checkpoint to the previous local date in Pacific/Honolulu, which matters for reports, releases, travel, and deadline wording.
HAST keeps this checkpoint on the same calendar date as UTC in Pacific/Honolulu.
HAST keeps this checkpoint on the same calendar date as UTC in Pacific/Honolulu.
These abbreviation pages currently share -10:00with HAST. They can show the same wall-clock hour while pointing at different countries, holidays, market calendars, languages, airports, and legal-time rules.
Cook Islands Time
CKT shares the current UTC offset with HAST, but it is anchored to Pacific/Rarotonga and Cook Islands. Treat the shared offset as arithmetic only, not as the same holidays, cities, market calendars, or policy context.
Hawaii-Aleutian Time
HADT shares the current UTC offset with HAST, but it is anchored to America/Adak and United States. Treat the shared offset as arithmetic only, not as the same holidays, cities, market calendars, or policy context.
Tahiti Time
TAHT shares the current UTC offset with HAST, but it is anchored to Pacific/Tahiti and French Polynesia. Treat the shared offset as arithmetic only, not as the same holidays, cities, market calendars, or policy context.
The hardest abbreviation mistakes happen when two labels share a similar offset. This matrix spells out what changes when the neighboring label is actually a different civil clock, city cluster, or source context.
HAST and HADT currently share -10:00, but they point at different civil-time labels, cities, countries, and source contexts. Treat the matching offset as arithmetic only, not semantic equivalence.
HAST and CKT currently share -10:00, but they point at different civil-time labels, cities, countries, and source contexts. Treat the matching offset as arithmetic only, not semantic equivalence.
HAST and TAHT currently share -10:00, but they point at different civil-time labels, cities, countries, and source contexts. Treat the matching offset as arithmetic only, not semantic equivalence.
HAST and AKDT sit near each other in the catalog, but the live offset and representative-zone context differ. Use the exact IANA zone before storing or sharing the time.
HAST and AKST sit near each other in the catalog, but the live offset and representative-zone context differ. Use the exact IANA zone before storing or sharing the time.
HAST and GAMT sit near each other in the catalog, but the live offset and representative-zone context differ. Use the exact IANA zone before storing or sharing the time.
Editorial disambiguation
HAST is Hawaii-Aleutian Standard Time, commonly tied to Pacific/Honolulu and UTC-10. The practical use case is Hawaii, Aleutian, maritime, aviation, and North Pacific scheduling. Hawaii itself does not follow the mainland daylight-saving pattern, so this abbreviation often stays stable when US mainland offsets change.
United States sits in Americas, specifically North America. Population 340,110,988, area 9,525,067 km², capital Washington, D.C.. Civic markers behind HAST include English and USD (United States dollar, $).
United States is linked as the country-level reference source for HAST; the civic context above is drawn from structured country fields rather than copied reference prose.
HAST in the Hawaii-Aleutian Time meaning runs 10h behind UTC through Atlantic, Pacific, or Indian Ocean island cluster, threading zones such as Pacific/Honolulu and America/Adak (cities: Honolulu, East Honolulu, and Pearl City). Country anchors: United States.
Hawaii-Aleutian Time
Current reading: HST at -10:00 in United States.
Pacific/Honolulu does not show a scheduled offset change in the next year, so the current offset can be treated as operationally stable for short-term planning.
City anchors include Honolulu, East Honolulu, and Pearl City, while country anchors include United States.
Hawaii-Aleutian Time
Current reading: HAST at -10:00 in United States.
America/Adak changes on March 14, 2027 at about 3:00 AM, moving from HAST (-10:00) to HADT (-09:00).
City anchors include Honolulu, East Honolulu, and Pearl City, while country anchors include United States.
Live reference zone: Pacific/Honolulu (HST, -10:00)
Leading city in the current dataset: Honolulu, United States.
Cities: Honolulu, United States, East Honolulu, United States, and Pearl City, United States. Countries: United States.
Live zones: Pacific/Honolulu (-10:00) and America/Adak (-10:00).
Countries
United States
Top cities
Honolulu, East Honolulu, Pearl City, Makakilo / Kapolei / Honokai Hale
United States spans 2 zones (39 cities) under HAST. Visible cities: Honolulu, East Honolulu, and Pearl City. Underlying zones: Pacific/Honolulu and America/Adak.
City anchors for HAST (Atlantic, Pacific, or Indian Ocean island cluster, currently -10:00). Pick a city to drop into a live local clock.
United States
Cities: Honolulu, East Honolulu, Pearl City, Makakilo / Kapolei / Honokai Hale
Meaning group: Hawaii-Aleutian Time
HAST reads cleanly across the Americas in this dataset, but the same letters can mean different things elsewhere (notably CST, EST, and IST overlap with non-American labels). Pin the IANA zone when the audience is international.
Pacific/Honolulu does not show an offset change in the next year, which makes HAST predictable for short-term scheduling. Predictable is not the same as permanent — civil-time rules still get changed by governments on relatively short notice.
For precise work, the safest equivalent of HAST is the exact IANA zone used by your city or system. Pacific/Honolulu sits at -10:00, behind UTC, which means daily logs in this zone reach a new calendar date after UTC does — relevant for date-aligned reports and billing cutoffs.
Even with one canonical meaning, HAST spans 2 IANA zones — pin to Pacific/Honolulu when DST or historical-rule precision matters.
The next best click after an abbreviation page usually depends on whether you need a city, a converter, or a live clock.
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