IANA tz database · zone identifier

Antarctica/Rothera

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

UTC-03:00Abbreviation -03No daylight saving
Time in Antarctica/Rothera☾ Night
20:01:36
Wednesday, October 14, 2026
Offset
UTC-03:00
Abbreviation
-03
DST
No DST

Current offset

UTC-03:00

same year-round

Abbreviation

-03

tzdb uses numeric abbreviations here

DST behaviour

None

one offset all year

Country

🇦🇶 Antarctica

ISO 3166: AQ · view country page →

Using this identifier

The string to put in your code.

Antarctica/Rothera 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 -03 or -03:00 — abbreviations are ambiguous and fixed offsets can't follow rule changes.

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

Offset & DST behaviour

One offset,
49 years.

Antarctica/Rothera has kept UTC-03:00 year-round since 30 November 1976 — no daylight saving and no offset changes on record since. It is among the most stable identifiers in the database.

Every offset this zone has kept

−04:32:32UTC-03:00 · UNCHANGED 30 November 1976 NOW

Keeping this offset since

30 November 1976

Next transition

None scheduled

no DST rules exist for this zone

Safe to assume

Local = UTC − 3h, always

…but store the identifier anyway

Technical record

The database entry, in full.

source: IANA tz database · release 2026d

IdentifierAntarctica/Rothera
ISO country codeAQ🇦🇶 Antarctica
Reference coordinates67.57°S, 68.13°Wtz database reference point
Standard offsetUTC-03:00abbreviation -03
Daylight offset—no daylight saving time
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 offset · UTC-03:00

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/Rothera?
Antarctica/Rothera is UTC-03:00, year-round. The offset never changes because the zone does not observe daylight saving time.
Does Antarctica/Rothera observe daylight saving time?
No. Antarctica/Rothera stays on UTC-03:00 all year, as it has since 30 November 1976.
Which country uses Antarctica/Rothera?
Antarctica. It is one of 10 IANA zones covering the country.
Is Antarctica/Rothera the same as ROTHER?
Antarctica/Rothera is one of the IANA zones that keeps Rothera Time (ROTHER). Use Antarctica/Rothera in software — ROTHER is a human-friendly label, not a valid identifier.

Free · Developer API

This zone, as JSON.

Its live offset, abbreviation and DST status, 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/Rothera
{
"data": {
"iana": "Antarctica/Rothera",
"observes_dst": false,
"country": { "code": "AQ", "name": "Antarctica" },
"current": {
"utc_offset": "-03:00",
"abbreviation": "-03",
…
},
…
}
}