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Antarctica/Macquarie time zone

11:57PMAEDT

AEDTUTC+11+16 h vs New York (you)

About Antarctica/Macquarie

Antarctica/Macquarie is the IANA time zone for Macquarie Island in Australia. It currently keeps Australian Eastern Standard Time (AEST, UTC+10) in winter and Australian Eastern Daylight Time (AEDT, UTC+11) in summer.

Its principal location is Macquarie at 54.50° S, 158.95° E.

Abbreviations in use: AEST, AEDT. Offset page: UTC+10.

Rule for future years (POSIX TZ string)

AEST-10AEDT,M10.1.0,M4.1.0/3

The standard time is called AEST and is UTC+10. POSIX writes the offset with the opposite sign (west of Greenwich is positive), which is why the string says "-10". Daylight saving time is called AEDT and is UTC+11. It starts on the first Sunday of October at 02:00 and ends on the first Sunday of April at 03:00, local time. Software that has no full tzdata copy, such as many embedded devices, can use this string directly as the TZ environment variable.

Upcoming transitions

Computed from tzdata 2026f; local times are read on the clock just before each change.

History of Antarctica/Macquarie since 1970

YearsClocksAbbreviations
1970–2009UTC+10 in winter, UTC+11 in summerAEDT, AEST
2010UTC+11 all yearAEDT
2011 onwardUTC+10 in winter, UTC+11 in summerAEDT, AEST

Before 1970

10 offset changes before 1970 in the record:

tzdata commits to accuracy from 1970 for every zone (zone1970.tab); earlier entries are historical research and may be incomplete.

Aliases and zones with the same clock

Other zones that keep exactly the same time under the current rules (but have a different history): Australia/Hobart, Australia/Melbourne, Australia/Sydney.

Convert Macquarie time

Tip: Alt+↑/↓ steps the time by 15 minutes (Shift: one hour). The link keeps the date, time and direction.

Using Antarctica/Macquarie in code

Every major platform reads the same IANA ID. Store instants in UTC and convert with the ID at display time; never store a fixed offset for a place that has daylight saving time.

// JavaScript
new Date().toLocaleString('en-US', { timeZone: 'Antarctica/Macquarie' })

# Python 3.9+
from zoneinfo import ZoneInfo
from datetime import datetime
datetime.now(ZoneInfo('Antarctica/Macquarie'))

// Java
java.time.ZonedDateTime.now(java.time.ZoneId.of("Antarctica/Macquarie"))

// Go
loc, _ := time.LoadLocation("Antarctica/Macquarie")
time.Now().In(loc)

-- PostgreSQL
SELECT now() AT TIME ZONE 'Antarctica/Macquarie';

# Shell
TZ='Antarctica/Macquarie' date

Platforms ship their own copy of tzdata and update it on their own schedule. After a rule change, outputs can differ until the platform updates; this page uses tzdata 2026f.

Questions

What is the UTC offset of Antarctica/Macquarie?
UTC+10 in winter and UTC+11 in summer (daylight saving time from the first Sunday of October at 2:00 AM to the first Sunday of April at 3:00 AM).
Does Antarctica/Macquarie observe daylight saving time?
Yes: clocks move one hour forward on the first Sunday of October at 2:00 AM and back on the first Sunday of April at 3:00 AM.
Which countries use Antarctica/Macquarie?
Australia, according to zone1970.tab in tzdata.

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