IANA tz database · zone identifier

America/Aruba

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

UTC-04:00Abbreviation ASTNo daylight saving
Time in America/Aruba☾ Night
19:00:25
Wednesday, October 14, 2026
Offset
UTC-04:00
Abbreviation
AST
DST
No DST

Current offset

UTC-04:00

same year-round

Abbreviation

AST

used year-round

DST behaviour

None

one offset all year

Country

🇦🇼 Aruba

ISO 3166: AW · view country page →

Using this identifier

The string to put in your code.

America/Aruba 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 AST or -04:00 — abbreviations are ambiguous and fixed offsets can't follow rule changes.

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

Offset & DST behaviour

One offset,
61 years.

America/Aruba has kept UTC-04:00 year-round since 1 January 1965 — 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

−04:39:52UTC-04:00 · UNCHANGED 1 January 1965 NOW

Keeping this offset since

1 January 1965

Next transition

None scheduled

no DST rules exist for this zone

Safe to assume

Local = UTC − 4h, always

…but store the identifier anyway

Technical record

The database entry, in full.

source: IANA tz database · release 2026d

IdentifierAmerica/Aruba
ISO country codeAW🇦🇼 Aruba
Reference coordinates12.50°N, 69.97°Wtz database reference point
Standard offsetUTC-04:00abbreviation AST
Daylight offset—no daylight saving time
tzdb release2026ddata current as of this IANA release

Where it applies

All of Aruba, one clock.

Looking for travel-friendly info? See Oranjestad or Atlantic Standard Time.

🇦🇼
Aruba

107K people, one time zone. The whole country resolves to America/Aruba.

Country page →
🇦🇼 Oranjestad
19:00
19:00:25 · AST
pop. 29KAST

Related identifiers

Nearby in the database.

Same zone group · Atlantic Standard Time

other identifiers keeping AST

America/AnguillaAnguillaAmerica/AntiguaAntigua and BarbudaAmerica/BarbadosBarbadosAmerica/Blanc-SablonCanadaAmerica/CuracaoCuraçaoAmerica/DominicaDominicaAmerica/Glace_BayCanadaAmerica/Goose_BayCanadaAmerica/GrenadaGrenadaAmerica/GuadeloupeGuadeloupeAmerica/HalifaxCanadaAmerica/KralendijkCaribbean NetherlandsAmerica/Lower_PrincesSint MaartenAmerica/MarigotSaint MartinAmerica/MartiniqueMartiniqueAmerica/MonctonCanadaAmerica/MontserratMontserratAmerica/Port_of_SpainTrinidad and TobagoAmerica/Puerto_RicoPuerto RicoAmerica/Santo_DomingoDominican RepublicAmerica/St_BarthelemySaint BarthélemyAmerica/St_KittsSaint Kitts and NevisAmerica/St_LuciaSaint LuciaAmerica/St_ThomasUnited States Virgin IslandsAmerica/St_VincentSaint Vincent and the GrenadinesAmerica/ThuleGreenlandAmerica/TortolaBritish Virgin IslandsAtlantic/BermudaBermuda

Same offset · UTC-04:00

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/Aruba?
America/Aruba is UTC-04:00, year-round. The offset never changes because the zone does not observe daylight saving time.
Does America/Aruba observe daylight saving time?
No. America/Aruba stays on UTC-04:00 all year, as it has since 1 January 1965.
Which country uses America/Aruba?
Aruba. The identifier covers the whole country.
Is America/Aruba the same as AST?
America/Aruba is one of the IANA zones that keeps Atlantic Standard Time (AST). Use America/Aruba in software — AST 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/America/Aruba
{
"data": {
"iana": "America/Aruba",
"observes_dst": false,
"country": { "code": "AW", "name": "Aruba" },
"current": {
"utc_offset": "-04:00",
"abbreviation": "AST",
…
},
…
}
}