IANA tz database · zone identifier

Pacific/Chatham

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

UTC+13:45Abbreviation +1345Observes daylight saving
Time in Pacific/Chatham☀ Daylight
12:45:09
Thursday, October 15, 2026
Offset
UTC+13:45
Abbreviation
+1345
DST
Active

Current offset

UTC+13:45

standard UTC+12:45 · daylight UTC+13:45

Abbreviation

+1345

tzdb uses numeric abbreviations here

DST behaviour

Observes

changes clocks twice a year

Country

🇳🇿 New Zealand

ISO 3166: NZ · view country page →

Using this identifier

The string to put in your code.

Pacific/Chatham 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 +1345 or +13:45 — abbreviations are ambiguous and fixed offsets can't follow rule changes.

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

Offset & DST behaviour

Two offsets,
every year.

Pacific/Chatham alternates between +1245 (UTC+12:45) and CHADT (UTC+13:45). Right now it is on +1345; clocks fall back on 4 April 2027.

The year at a glance

+1245 · UTC+12:45CHADT · UTC+13:4527 Sept · +1h4 Apr · −1h Jan 2026 Dec

Technical record

The database entry, in full.

source: IANA tz database · release 2026d

IdentifierPacific/Chatham
ISO country codeNZ🇳🇿 New Zealand
Reference coordinates43.95°S, 176.55°Wtz database reference point
Standard offsetUTC+12:45abbreviation +1245
Daylight offsetUTC+13:45abbreviation CHADT
tzdb release2026ddata current as of this IANA release

Where it applies

One of New Zealand's 2 zones.

🇳🇿
New Zealand

5.3M people, 2 time zones — this identifier covers one of them.

Country page →

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/Chatham?
Pacific/Chatham is currently UTC+13:45 (+1345). It alternates between UTC+12:45 in winter and UTC+13:45 in summer.
Does Pacific/Chatham observe daylight saving time?
Yes. Clocks fall back at the next transition on 4 April 2027, as they do twice every year.
Which country uses Pacific/Chatham?
New Zealand. It is one of 2 IANA zones covering the country.
Is Pacific/Chatham the same as CHAST?
Pacific/Chatham is one of the IANA zones that keeps Chatham Standard Time (CHAST). Use Pacific/Chatham in software — CHAST is a human-friendly label, not a valid identifier.

Free · Developer API

This zone, as JSON.

Its live offset, abbreviation, DST status and next clock change, plus its coordinates and country, from one endpoint.

GET /v1/timezones Live

Also in the API: time zones by coordinates, conversions that flag daylight saving gaps, and abbreviations decoded.

Get your free API key → All endpoints Plans and pricing

Moving off WorldTimeAPI? Our drop-in replacement needs no key.

// this identifier, resolved live
GET /v1/timezones/Pacific/Chatham
{
"data": {
"iana": "Pacific/Chatham",
"observes_dst": true,
"country": { "code": "NZ", "name": "New Zealand" },
"current": {
"utc_offset": "+13:45",
"abbreviation": "+1345",
…
},
…
}
}