IANA tz database · zone identifier

Atlantic/Bermuda

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

UTC-03:00Abbreviation ADTObserves daylight saving
Time in Atlantic/Bermuda☾ Night
19:56:06
Wednesday, July 15, 2026
Offset
UTC-03:00
Abbreviation
ADT
DST
Active

Current offset

UTC-03:00

standard UTC-04:00 · daylight UTC-03:00

Abbreviation

ADT

the daylight-saving form

DST behaviour

Observes

changes clocks twice a year

Country

🇧🇲 Bermuda

ISO 3166: BM · view country page →

Using this identifier

The string to put in your code.

Atlantic/Bermuda 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 ADT 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: 'Atlantic/Bermuda',
dateStyle: 'full', timeStyle: 'long'
}).format(new Date());

Offset & DST behaviour

Two offsets,
every year.

Atlantic/Bermuda alternates between AST (UTC-04:00) and ADT (UTC-03:00). Right now it is on ADT; clocks fall back on 1 November 2026.

The year at a glance

AST · UTC-04:00ADT · UTC-03:00AST · UTC-04:008 Mar · +1h1 Nov · −1h Jan 2026 Dec

Technical record

The database entry, in full.

source: IANA tz database

IdentifierAtlantic/Bermuda
ISO country codeBM🇧🇲 Bermuda
Reference coordinates32.28°N, 64.77°Wtz database reference point
Standard offsetUTC-04:00abbreviation AST
Daylight offsetUTC-03:00abbreviation ADT

Where it applies

All of Bermuda, one clock.

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

🇧🇲
Bermuda

65K people, one time zone. The whole country resolves to Atlantic/Bermuda.

Country page →
🇧🇲 Hamilton
19:56
19:56:06 · ADT
pop. 3.7KAST

Related identifiers

Nearby in the database.

Same zone group · Atlantic Standard Time

other identifiers keeping AST

America/AnguillaAnguillaAmerica/AntiguaAntigua and BarbudaAmerica/ArubaArubaAmerica/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 Islands

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 Atlantic/Bermuda?
Atlantic/Bermuda is currently UTC-03:00 (ADT). It alternates between UTC-04:00 in winter and UTC-03:00 in summer.
Does Atlantic/Bermuda observe daylight saving time?
Yes. Clocks fall back at the next transition on 1 November 2026, as they do twice every year.
Which country uses Atlantic/Bermuda?
Bermuda. The identifier covers the whole country.
Is Atlantic/Bermuda the same as AST?
Atlantic/Bermuda is one of the IANA zones that keeps Atlantic Standard Time (AST). Use Atlantic/Bermuda in software — AST 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=Atlantic/Bermuda
{
"iana": "Atlantic/Bermuda",
"utc_offset": "-03:00",
"abbreviation": "ADT",
"observes_dst": true,
"country": "BM"
}