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Timezone abbreviation
CHAST currently resolves here through Pacific/Chatham, where the live offset is +12:45 (GMT+12:45). This page expands that into the broader meaning set, top cities, countries, similar labels, and safer exact-zone equivalents.
Last updated recently. 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.
CHAST is used in this dataset for Chatham Time. Right now it maps to 1 meaning, 1 IANA zone, and 1 country.
This page uses Pacific/Chatham as the live reference at +12:45 (GMT+12:45). CHAST works more as a reference label here than as a city-anchored civil-time label, so the IANA zone is what carries the practical weight.
CHAST currently shows +12:45, but Pacific/Chatham observes seasonal clock changes — the next transition is around September 27, 2026. That means the offset on this page is a snapshot, not a permanent fact, so long-range scheduling should pin the underlying IANA zone instead of the abbreviation.
Live reference
Pacific/Chatham
Current offset
+12:45 (GMT+12:45)
Meanings / zones / countries
1 / 1 / 1
Offset range
UTC+12:45 to UTC+13:45
CHAST is far ahead of UTC, into the Pacific island band, so the same calendar day finishes here before North America wakes up. In practice it is read inside Atlantic, Pacific, or Indian Ocean island cluster, where the leading city anchors are reference-only timezone clusters.
CHAST is unusually unambiguous: it ties to a single country and a single IANA zone, which is closer to a national clock label than a multi-region abbreviation.
CHAST shows up on airline schedules, weather bulletins, and Pacific shipping notices more than on office calendars. CHAST can also flip to a sibling daylight-saving abbreviation later in the year, so timestamps before and after the change need to be read carefully.
Zone family, representative city, current offset, country coverage, and nearby abbreviation context for CHAST.
Primary zone
Pacific/Chatham
Live offset
+12:45 · GMT+12:45
Region family
Atlantic, Pacific, or Indian Ocean island cluster
Meaning count
1 meaning
Zone / country reach
1 zones · 1 countries
Country anchor
New Zealand
DST posture
Seasonal clock changes detected in the representative zone
Offset range
UTC+12:45 to UTC+13:45
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 CHASTinto another abbreviation with the same clock hour.
Route identity
chast · CHAST · Chatham Time · Pacific/Chatham
Exact IANA zone set
Pacific/Chatham
Place anchors
New Zealand
Country anchors
New Zealand (Pacific/Chatham)
Transition fingerprints
Pacific/Chatham: GMT+12:45-GMT+13:45 on September 27, 2026
Offset peers to verify
CHADT (Pacific/Chatham)
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
Chatham Time resolves through Pacific/Chatham right now: +12:45 (GMT+12:45).
Ambiguity status
CHAST 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/Chatham changes on September 27, 2026 at about 3:45 AM, moving from GMT+12:45 (+12:45) to GMT+13:45 (+13:45).
Country and city reach
CHAST is represented across 1 country, 1 IANA zone, and lead cities including New Zealand.
Same-offset caution
CHAST and CHADT currently share +12:45, but they point at different civil-time labels, cities, countries, and source contexts. Treat the matching offset as arithmetic only, not semantic equivalence.
Precision layer
Timezone abbreviations are useful display labels, but they are weak storage keys. This register shows the exact risks for CHAST: ambiguity, seasonal changes, same-offset neighbors, and the safer value to store in software, calendars, or operations notes.
Abbreviation ambiguity risk
LowCHAST has one meaning in this catalog, but the zone and country context still carry the legal-time rule.
Seasonal clock-change risk
MediumPacific/Chatham changes offset in this snapshot. Next known transition: September 27, 2026: GMT+12:45 +12:45 to GMT+13:45 +13:45.
Same-offset confusion risk
Low1 other abbreviation page currently share +12:45; the same clock hour is not the same civil-time context.
Storage recommendation
Use exact zoneStore Pacific/Chatham or a UTC instant. Display CHAST only as a human-facing label after the exact zone is known.
Coverage breadth
1 zonesCHAST covers 1 IANA zone and 1 country grouping in this page's retained dataset.
Four fixed UTC checkpoints expose whether CHAST crosses a local date boundary in Pacific/Chatham. This is the practical difference between a harmless clock conversion and a deadline, release, travel, or reporting mistake.
CHAST keeps this checkpoint on the same calendar date as UTC in Pacific/Chatham.
CHAST keeps this checkpoint on the same calendar date as UTC in Pacific/Chatham.
CHAST moves this checkpoint to the next local date in Pacific/Chatham, which matters for reports, releases, travel, and deadline wording.
CHAST moves this checkpoint to the next local date in Pacific/Chatham, which matters for reports, releases, travel, and deadline wording.
These abbreviation pages currently share +12:45with CHAST. They can show the same wall-clock hour while pointing at different countries, holidays, market calendars, languages, airports, and legal-time rules.
Chatham Time
CHADT shares the current UTC offset with CHAST, but it is anchored to Pacific/Chatham and New Zealand. 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.
CHAST and CHADT currently share +12:45, but they point at different civil-time labels, cities, countries, and source contexts. Treat the matching offset as arithmetic only, not semantic equivalence.
CHAST and FJT 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.
CHAST and GILT 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.
CHAST and MHT 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.
CHAST and NRT 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.
CHAST and NZDT 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.
New Zealand sits in Oceania, specifically Australia and New Zealand. Population 5,324,700, area 268,838 km², capital Wellington. Civic markers behind CHAST include English, Māori, and New Zealand Sign Language and NZD (New Zealand dollar, $).
New Zealand is linked as the country-level reference source for CHAST; the civic context above is drawn from structured country fields rather than copied reference prose.
CHAST in the Chatham Time meaning runs 12h45m ahead of UTC through Atlantic, Pacific, or Indian Ocean island cluster, threading zones such as Pacific/Chatham (cities: reference cities). Country anchors: New Zealand.
Chatham Time
Current reading: GMT+12:45 at +12:45 in New Zealand.
Pacific/Chatham changes on September 27, 2026 at about 3:45 AM, moving from GMT+12:45 (+12:45) to GMT+13:45 (+13:45).
City anchors include reference cities, while country anchors include New Zealand.
Live reference zone: Pacific/Chatham (GMT+12:45, +12:45)
Cities: reference-only mappings. Countries: New Zealand.
Live zones: Pacific/Chatham (+12:45).
Countries
New Zealand
Top cities
Reference-only meaning
New Zealand runs on a single zone (0 mapped cities) under CHAST. Visible cities: the lead reference city. Underlying zones: Pacific/Chatham.
City anchors for CHAST (Atlantic, Pacific, or Indian Ocean island cluster, currently +12:45). Pick a city to drop into a live local clock.
New Zealand
Zones: Pacific/Chatham
Meaning group: Chatham Time
CHAST is not heavily split in the current catalog, but the short label still hides the underlying IANA zone and any future policy change. The safe pattern is to write the abbreviation for humans and the zone for machines.
Pacific/Chatham has an upcoming offset change on September 27, 2026. After that point, CHAST on this page will read a different UTC offset until the next transition, so any saved timestamp should anchor to the IANA zone rather than the abbreviation.
For precise work, the safest equivalent of CHAST is the exact IANA zone used by your city or system. Pacific/Chatham sits at +12:45, ahead of UTC, which means daily logs in this zone reach a new calendar date before UTC does — a small detail that breaks date-based reporting if missed.
Within this single zone (Pacific/Chatham, +12:45), CHAST is unambiguous, so the abbreviation and the IANA zone effectively interchange.
The next best click after an abbreviation page usually depends on whether you need a city, a converter, or a live clock.
Timezone converter
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World clock
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