IANA tz database · zone identifier

Asia/Ulaanbaatar

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

UTC+08:00Abbreviation +08No daylight saving
Time in Asia/Ulaanbaatar☀ Daylight
07:00:53
Thursday, October 15, 2026
Offset
UTC+08:00
Abbreviation
+08
DST
No DST

Current offset

UTC+08:00

same year-round

Abbreviation

+08

tzdb uses numeric abbreviations here

DST behaviour

None

one offset all year

Country

🇲🇳 Mongolia

ISO 3166: MN · view country page →

Using this identifier

The string to put in your code.

Asia/Ulaanbaatar 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 +08 or +08:00 — abbreviations are ambiguous and fixed offsets can't follow rule changes.

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

Offset & DST behaviour

One offset,
10 years.

Asia/Ulaanbaatar has kept UTC+08:00 year-round since 23 September 2016 — 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

+07:07:32UTC+08:00 · UNCHANGED 23 September 2016 NOW

Keeping this offset since

23 September 2016

Next transition

None scheduled

no DST rules exist for this zone

Safe to assume

Local = UTC + 8h, always

…but store the identifier anyway

Technical record

The database entry, in full.

source: IANA tz database · release 2026d

IdentifierAsia/Ulaanbaatar
ISO country codeMN🇲🇳 Mongolia
Reference coordinates47.92°N, 106.88°Etz database reference point
Standard offsetUTC+08:00abbreviation +08
Daylight offset—no daylight saving time
tzdb release2026ddata current as of this IANA release

Where it applies

One of Mongolia's 2 zones.

Looking for travel-friendly info? See Ulan Bator or Ulaanbaatar Standard Time.

🇲🇳
Mongolia

3.4M people, 2 time zones — this identifier covers one of them.

Country page →
🇲🇳 Ulan Bator
07:00
07:00:53 · +08
pop. 1.4MUST

Related identifiers

Nearby in the database.

Same offset · UTC+08:00

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 Asia/Ulaanbaatar?
Asia/Ulaanbaatar is UTC+08:00, year-round. The offset never changes because the zone does not observe daylight saving time.
Does Asia/Ulaanbaatar observe daylight saving time?
No. Asia/Ulaanbaatar stays on UTC+08:00 all year, as it has since 23 September 2016.
Which country uses Asia/Ulaanbaatar?
Mongolia. It is one of 2 IANA zones covering the country.
Is Asia/Ulaanbaatar the same as UST?
Asia/Ulaanbaatar is one of the IANA zones that keeps Ulaanbaatar Standard Time (UST). Use Asia/Ulaanbaatar in software — UST 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/Asia/Ulaanbaatar
{
"data": {
"iana": "Asia/Ulaanbaatar",
"observes_dst": false,
"country": { "code": "MN", "name": "Mongolia" },
"current": {
"utc_offset": "+08:00",
"abbreviation": "+08",
…
},
…
}
}