IANA tz database · zone identifier

Antarctica/Syowa

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

UTC+03:00Abbreviation +03No DST — never observed
Time in Antarctica/Syowa☾ Night
02:00:37
Thursday, July 16, 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

Never

has never observed daylight saving

Country

🇦🇶 Antarctica

ISO 3166: AQ · view country page →

Using this identifier

The string to put in your code.

Antarctica/Syowa 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/Syowa',
dateStyle: 'full', timeStyle: 'long'
}).format(new Date());

Offset & DST behaviour

One offset,
69 years.

Antarctica/Syowa has kept UTC+03:00 year-round since 29 January 1957 — 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

+02:38:22UTC+03:00 · UNCHANGED 29 January 1957 NOW

Keeping this offset since

29 January 1957

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

IdentifierAntarctica/Syowa
ISO country codeAQ🇦🇶 Antarctica
Reference coordinates69.01°S, 39.59°Etz database reference point
Standard offsetUTC+03:00abbreviation +03
Daylight offset—daylight saving has never been observed

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/Syowa?
Antarctica/Syowa is UTC+03:00, year-round. The offset never changes because the zone does not observe daylight saving time.
Does Antarctica/Syowa observe daylight saving time?
No. Antarctica/Syowa has never observed DST — it has kept UTC+03:00 continuously since 29 January 1957.
Which country uses Antarctica/Syowa?
Antarctica. It is one of 10 IANA zones covering the country.
Is Antarctica/Syowa the same as SYOWAT?
Antarctica/Syowa is one of the IANA zones that keeps Syowa Time (SYOWAT). Use Antarctica/Syowa in software — SYOWAT 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/Syowa
{
"iana": "Antarctica/Syowa",
"utc_offset": "+03:00",
"abbreviation": "+03",
"observes_dst": false,
"country": "AQ"
}