IANA tz database · zone identifier

Asia/Tokyo

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

UTC+09:00Abbreviation JSTNo DST — never observed

Time in Asia/Tokyo☀ Daylight

07:56:31

Thursday, July 16, 2026

Offset

UTC+09:00

Abbreviation

JST

DST

No DST

Current offset

UTC+09:00

same year-round

Abbreviation

JST

used year-round

DST behaviour

Never

has never observed daylight saving

Country

🇯🇵 Japan

ISO 3166: JP · view country page →

Using this identifier

The string to put in your code.

Asia/Tokyo 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 JST or +09:00 — abbreviations are ambiguous and fixed offsets can't follow rule changes.

// format a date in this zone

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

timeZone: 'Asia/Tokyo',

dateStyle: 'full', timeStyle: 'long'

}).format(new Date());

Offset & DST behaviour

One offset,
74 years.

Asia/Tokyo has kept UTC+09:00 year-round since 9 September 1951 — 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

Keeping this offset since

9 September 1951

Next transition

None scheduled

no DST rules exist for this zone

Safe to assume

Local = UTC + 9h, always

…but store the identifier anyway

Technical record

The database entry, in full.

source: IANA tz database

IdentifierAsia/Tokyo

ISO country codeJP🇯🇵 Japan

Reference coordinates35.65°N, 139.74°Etz database reference point

Standard offsetUTC+09:00abbreviation JST

Daylight offset—daylight saving has never been observed

Where it applies

All of Japan, one clock.

Looking for travel-friendly info? See Tokyo or Japan Standard Time.

🇯🇵

Japan

124M people, one time zone. The whole country resolves to Asia/Tokyo.

Related identifiers

Nearby in the database.

Same offset · UTC+09:00

other zones keeping this offset right now

Asia/ChitaRussia · Yakutsk Standard Time Asia/DiliTimor-Leste · East Timor Time Asia/KhandygaRussia · Yakutsk Standard Time Asia/PyongyangNorth Korea · Korean Standard Time Asia/SeoulSouth Korea · Korean Standard Time Asia/YakutskRussia · Yakutsk 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 Asia/Tokyo?: Asia/Tokyo is UTC+09:00, year-round. The offset never changes because the zone does not observe daylight saving time.
Does Asia/Tokyo observe daylight saving time?: No. Asia/Tokyo has never observed DST — it has kept UTC+09:00 continuously since 9 September 1951.
Which country uses Asia/Tokyo?: Japan. The identifier covers the whole country.
Is Asia/Tokyo the same as JST?: Asia/Tokyo is one of the IANA zones that keeps Japan Standard Time (JST). Use Asia/Tokyo in software — JST 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=Asia/Tokyo

{

"iana": "Asia/Tokyo",

"utc_offset": "+09:00",

"abbreviation": "JST",

"observes_dst": false,

"country": "JP"

}