IANA tz database · zone identifier

Antarctica/McMurdo

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

UTC+13:00Abbreviation NZDTObserves daylight saving

Time in Antarctica/McMurdo☀ Daylight

12:03:44

Thursday, October 15, 2026

Offset

UTC+13:00

Abbreviation

NZDT

DST

Active

Current offset

UTC+13:00

standard UTC+12:00 · daylight UTC+13:00

Abbreviation

NZDT

the daylight-saving form

DST behaviour

Observes

changes clocks twice a year

Country

🇦🇶 Antarctica

ISO 3166: AQ · view country page →

Using this identifier

The string to put in your code.

Antarctica/McMurdo 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 NZDT or +13:00 — abbreviations are ambiguous and fixed offsets can't follow rule changes.

// format a date in this zone

new Intl.DateTimeFormat('en-US', {

timeZone: 'Antarctica/McMurdo',

dateStyle: 'full', timeStyle: 'long'

}).format(new Date());

Offset & DST behaviour

Two offsets,
every year.

Antarctica/McMurdo alternates between NZST (UTC+12:00) and NZDT (UTC+13:00). Right now it is on NZDT; clocks fall back on 4 April 2027.

The year at a glance

Technical record

The database entry, in full.

source: IANA tz database · release 2026d

IdentifierAntarctica/McMurdo

ISO country codeAQ🇦🇶 Antarctica

Reference coordinates77.83°S, 166.60°Etz database reference point

Standard offsetUTC+12:00abbreviation NZST

Daylight offsetUTC+13:00abbreviation NZDT

tzdb release2026ddata current as of this IANA release

Where it applies

One of Antarctica's 10 zones.

🇦🇶

Antarctica

5K people, 10 time zones — this identifier covers one of them.

Country page →

Related identifiers

Nearby in the database.

Same zone group · New Zealand Standard Time

other identifiers keeping NZST

Pacific/AucklandNew Zealand

Same offset · UTC+13:00

other zones keeping this offset right now

Pacific/ApiaSamoa · Apia Standard Time Pacific/FakaofoTokelau · Tokelau Time Pacific/TongatapuTonga · Tonga Standard Time Pacific/KantonKiribati · Phoenix Islands Time

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 Antarctica/McMurdo?: Antarctica/McMurdo is currently UTC+13:00 (NZDT). It alternates between UTC+12:00 in winter and UTC+13:00 in summer.
Does Antarctica/McMurdo 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 Antarctica/McMurdo?: Antarctica. It is one of 10 IANA zones covering the country.
Is Antarctica/McMurdo the same as NZST?: Antarctica/McMurdo is one of the IANA zones that keeps New Zealand Standard Time (NZST). Use Antarctica/McMurdo in software — NZST 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/Antarctica/McMurdo

{

"data": {

"iana": "Antarctica/McMurdo",

"observes_dst": true,

"country": { "code": "AQ", "name": "Antarctica" },

"current": {

"utc_offset": "+13:00",

"abbreviation": "NZDT",

…

}