IANA tz database · zone identifier

America/Montevideo

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

UTC-03:00Abbreviation -03No DST — never observed
Time in America/Montevideo☾ Night
19:57:12
Wednesday, July 15, 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

🇺🇾 Uruguay

ISO 3166: UY · view country page →

Using this identifier

The string to put in your code.

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

Offset & DST behaviour

One offset,
11 years.

America/Montevideo has kept UTC-03:00 year-round since 8 March 2015 — 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

−03:44:51UTC-03:00 · UNCHANGED 8 March 2015 NOW

Keeping this offset since

8 March 2015

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

IdentifierAmerica/Montevideo
ISO country codeUY🇺🇾 Uruguay
Reference coordinates34.91°S, 56.21°Wtz database reference point
Standard offsetUTC-03:00abbreviation -03
Daylight offset—daylight saving has never been observed

Where it applies

All of Uruguay, one clock.

Looking for travel-friendly info? See Montevideo or Uruguay Standard Time.

🇺🇾
Uruguay

3.4M people, one time zone. The whole country resolves to America/Montevideo.

Country page →
🇺🇾 Montevideo
19:57
19:57:12 · -03
pop. 1.3MUST

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 America/Montevideo?
America/Montevideo is UTC-03:00, year-round. The offset never changes because the zone does not observe daylight saving time.
Does America/Montevideo observe daylight saving time?
No. America/Montevideo has never observed DST — it has kept UTC-03:00 continuously since 8 March 2015.
Which country uses America/Montevideo?
Uruguay. The identifier covers the whole country.
Is America/Montevideo the same as UST?
America/Montevideo is one of the IANA zones that keeps Uruguay Standard Time (UST). Use America/Montevideo in software — UST 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=America/Montevideo
{
"iana": "America/Montevideo",
"utc_offset": "-03:00",
"abbreviation": "-03",
"observes_dst": false,
"country": "UY"
}