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+11:00Abbreviation AEDTObserves daylight saving
Time in Antarctica/Macquarie☀ Daylight
10:03:45
Thursday, October 15, 2026
Offset
UTC+11:00
Abbreviation
AEDT
DST
Active

Current offset

UTC+11:00

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

Abbreviation

AEDT

the daylight-saving 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 AEDT or +11:00 — 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 AEDT; clocks fall back on 4 April 2027.

The year at a glance

AEDT · UTC+11:00AEST · UTC+10:004 Oct · +1h4 Apr · −1h Jan 2027 Dec

Technical record

The database entry, in full.

source: IANA tz database · release 2026d

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
tzdb release2026ddata current as of this IANA release

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

Same offset · UTC+11:00

other zones keeping this offset right now

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+11:00 (AEDT). It alternates between UTC+10:00 in winter and UTC+11:00 in summer.
Does Antarctica/Macquarie 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/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.

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/Macquarie
{
"data": {
"iana": "Antarctica/Macquarie",
"observes_dst": true,
"country": { "code": "AU", "name": "Australia" },
"current": {
"utc_offset": "+11:00",
"abbreviation": "AEDT",
…
},
…
}
}