IANA tz database · zone identifier

Antarctica/Macquarie

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

UTC+10:00Abbreviation AESTObserves daylight saving

Time in Antarctica/Macquarie☀ Daylight

09:00:11

Thursday, July 16, 2026

Offset

UTC+10:00

Abbreviation

AEST

DST

Observed

Current offset

UTC+10:00

standard UTC+10:00 · daylight UTC+11:00

Abbreviation

AEST

the standard-time form

DST behaviour

Observes

changes clocks twice a year

Country

🇦🇺 Australia

ISO 3166: AU · view country page →

Using this identifier

The string to put in your code.

Antarctica/Macquarie 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 AEST or +10:00 — abbreviations are ambiguous and fixed offsets can't follow rule changes.

// format a date in this zone

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

timeZone: 'Antarctica/Macquarie',

dateStyle: 'full', timeStyle: 'long'

}).format(new Date());

Offset & DST behaviour

Two offsets,
every year.

Antarctica/Macquarie alternates between AEST (UTC+10:00) and AEDT (UTC+11:00). Right now it is on AEST; clocks spring forward on 4 October 2026.

The year at a glance

Technical record

The database entry, in full.

source: IANA tz database

IdentifierAntarctica/Macquarie

ISO country codeAU🇦🇺 Australia

Reference coordinates54.50°S, 158.95°Etz database reference point

Standard offsetUTC+10:00abbreviation AEST

Daylight offsetUTC+11:00abbreviation AEDT

Where it applies

One of Australia's 12 zones.

🇦🇺

Australia

28M people, 12 time zones — this identifier covers one of them.

Country page →

Related identifiers

Nearby in the database.

Same zone group · Australian Eastern Standard Time

other identifiers keeping AEST

Australia/BrisbaneAustralia Australia/HobartAustralia Australia/LindemanAustralia Australia/MelbourneAustralia Australia/SydneyAustralia

Same offset · UTC+10:00

other zones keeping this offset right now

Asia/Ust-NeraRussia · Vladivostok Standard Time Asia/VladivostokRussia · Vladivostok Standard Time Pacific/ChuukMicronesia · Chuuk Time Pacific/GuamGuam · Chamorro Standard Time Pacific/Port_MoresbyPapua New Guinea · Papua New Guinea Time Pacific/SaipanNorthern Mariana Islands · Chamorro Standard 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/Macquarie?: Antarctica/Macquarie is currently UTC+10:00 (AEST). It alternates between UTC+10:00 in winter and UTC+11:00 in summer.
Does Antarctica/Macquarie observe daylight saving time?: Yes. Clocks spring forward at the next transition on 4 October 2026, as they do twice every year.
Which country uses Antarctica/Macquarie?: Australia. It is one of 12 IANA zones covering the country.
Is Antarctica/Macquarie the same as AEST?: Antarctica/Macquarie is one of the IANA zones that keeps Australian Eastern Standard Time (AEST). Use Antarctica/Macquarie in software — AEST is a human-friendly label, not a valid identifier.

Free · Developer API

This zone, as JSON.

Everything on this page — offset, abbreviation, DST rules, coordinates — from one endpoint, always current with the latest tzdb release.

GET /v1/timezones Live

countries, cities, convert, DST transitions coming next.

Get your free API key →

// this identifier, resolved live

GET /v1/timezones?iana=Antarctica/Macquarie

{

"iana": "Antarctica/Macquarie",

"utc_offset": "+10:00",

"abbreviation": "AEST",

"observes_dst": true,

"country": "AU"

}