What is the current UTC offset for Australia/Adelaide?

Australia/Adelaide is currently at UTC+09:30 (GMT+9:30). The page revalidates weekly, but live clocks on this page tick from the IANA zone in real time.

Does Australia/Adelaide observe daylight saving time in 2026?

Yes. Australia/Adelaide has 2 scheduled transitions in the next 12 months. The first is October 4, 2026 (UTC+09:30 → UTC+10:30, +1h). Anchor saved timestamps to the IANA zone, not to a fixed UTC offset, so they survive the change automatically.

Which cities use Australia/Adelaide?

Australia/Adelaide is the canonical clock for cities including Adelaide, Adelaide Hills, Mount Gambier, Morphett Vale. The page lists 4 indexable cities in this zone after locale and crawl-safety filters.

What abbreviations does Australia/Adelaide use?

Australia/Adelaide resolves to ACDT, ACST across the next 12 months — the abbreviation rotates with each DST transition. Calendar entries should anchor to the IANA zone instead of an abbreviation so the right offset is used in each window.

Why does Australia use Australia/Adelaide?

Australia is mapped to Australia/Adelaide as one of its IANA zones in the country-zone catalog. The IANA zone records each jurisdiction's historical offset and DST rule changes; Australia/Adelaide stores the rules used by Australia (ISO AU).

IANA timezone

Australia/Adelaide.

ACSTUTC+09:30Standard time

Australia/Adelaide is the IANA timezone for Australia, currently at UTC+09:30 (ACST). It does not observe daylight saving time; the offset stays the same year-round. The zone covers 4 cities listed below, with live clocks updating every second.

Last updated recently. Offset, DST behavior, and city coverage are refreshed from the live timezone dataset during the page revalidation window.

Current time in ACST

--:--:--

Australia/Adelaide · UTC+09:30

All timezones in Australia →View ACST abbreviation →

Abbreviation

ACST

UTC Offset

UTC+09:30

DST Status

Standard Time

Country

Australia

Timezone planning depth

What Australia/Adelaide is useful for

A timezone page should do more than define an offset. These notes connect the zone to city clocks, DST behavior, converters, and adjacent country planning pages.

Zone identity

Australia/Adelaide is rendered as ACST at UTC+09:30 for Australia. The IANA zone ID is the stable key; the abbreviation is only the short display label.

DST behavior

Australia/Adelaide has 2 scheduled offset transitions in the next 12 months. Next transition: October 4, 2026 (UTC+09:30 → UTC+10:30, +1h). Cumulative offset movement across the window is +2h. Use the IANA zone ID rather than a fixed UTC offset when scheduling across these dates.

City coverage

4 indexable cities sit in this zone after locale and crawl-safety filters, with Adelaide, Adelaide Hills, Mount Gambier, and Morphett Vale among the examples shown.

Conversion handoff

ACST has no pre-built converter pair, so a custom comparison runs through the general timezone converter instead.

Adjacent planning context

The most useful next steps from this timezone page are holiday calendars, airport-country planning, and city clocks. Those links keep the zone page connected to real user tasks rather than stopping at an offset definition.

Abbreviations across the year

Australia/Adelaide resolves to multiple display abbreviations in the next 12 months: ACDT and ACST. The abbreviation rotates with the offset, which is why long-lived calendar entries should be anchored to the IANA zone instead of a saved abbreviation.

Offset stability

Australia/Adelaide spends about 182 days at UTC+10:30 across the forward 12-month window, which makes it the longer-running of two seasonal offsets. The remaining time is split across the other offsets listed in the year-of-DST card.

Peer zones at the same offset

Other IANA zones currently aligned at UTC+09:30 include Australia/Darwin. Same-offset peers can drift apart later in the year if their DST rules differ, so a peer match today is not a permanent equivalence.

Country roster

Australia/Adelaide is used as the primary clock anchor for Australia. The roster is derived from country-zone mappings, so it reflects which jurisdictions adopt this IANA zone rather than which countries happen to share its current offset.

Timezone abbreviations can be ambiguous. The IANA zone name is the canonical key used for clocks, city pages, and conversion math.

Timezone policy evidence

Australia/Adelaide source-change evidence

Australia/Adelaide is handled as an IANA timezone record, not as a fixed UTC offset. The page separates deployed timezone math from legal or government policy sources so users know what is calculated and what may change.

7/8 checks

IANA identity

Verified

Canonical key: Australia/Adelaide. Route slug: /time-zone/australia-adelaide/. This is the stable identifier used for clocks, converters, and city pages.

Current runtime offset

Verified

Australia/Adelaide currently renders as UTC+09:30 (GMT+9:30). Live clocks use the IANA zone, not a hard-coded offset string.

Transition watch

Verified

2 transitions appear in the forward 12-month sweep. Next: October 4, 2026 (UTC+09:30 → UTC+10:30, +1h).

Policy source

Boundary

No jurisdiction-specific policy source is attached to this zone yet; IANA is still the machine-readable calculation source.

Coverage proof

Verified

4 retained cities and 1 country roster entry point at this zone. Countries: Australia.

Abbreviation risk

Verified

Abbreviations attached here: ACDT and ACST. Abbreviations can rotate with DST and can be ambiguous across regions, so IANA remains the canonical key.

Same-offset drift

Verified

1 same-offset peer match the current offset right now. Same-offset peers can diverge later if DST or law changes differ.

Change-source boundary

Verified

IANA Time Zone Database is the deployed calculation source. Legal policy changes should be confirmed through government/time-authority notices before relying on future local-time rules.

Practical use cases

Calendar storage

Store future events with Australia/Adelaide, then let the runtime timezone database decide the correct offset on each date.

Policy-change review

When a government announces a timezone or DST change, check the policy source and the next deployed tzdb/runtime update before changing user-facing copy.

Duplicate avoidance

Use the IANA zone page when abbreviations or same-offset zones could collapse into duplicate-looking converter content.

Trust boundaries

Not legal advice: This page explains timezone calculation data. It is not a statutory clock-change notice or legal compliance source.
Runtime dependency: Exact future rows depend on the timezone database available to the deployed runtime and app build.

Source-change watch

When timezone policy changes

Machine-readable rule source

Exact offsets and transition rows come from the IANA Time Zone Database as exposed by the deployed runtime. IANA publishes tzdb releases when governments change civil-time rules.

Check IANA Time Zone Database

Policy-source boundary

No jurisdiction-specific policy source is attached for Australia/Adelaide. Confirm legal clock-change announcements with the relevant government or time authority before relying on future rules.

Year-round offset behavior

Australia/Adelaide across the next 12 months

The forward 12-month sweep returned 2 scheduled offset transitions. Cumulative offset movement is +2h. Anchor stored timestamps to the IANA zone, not to a fixed UTC offset.

Date (local)	Local time	From	To	Gap
October 4, 2026	3:00 AM	UTC+09:30 (GMT+9:30)	UTC+10:30 (GMT+10:30)	+1h
April 4, 2027	2:00 AM	UTC+10:30 (GMT+10:30)	UTC+09:30 (GMT+9:30)	-1h

Offset window

UTC+09:30 (GMT+9:30)

123 days

Offset window

UTC+10:30 (GMT+10:30)

182 days

Offset window

UTC+09:30 (GMT+9:30)

60 days

Primary offset across the window: UTC+10:30 (GMT+10:30) for about 182 days.

Coverage reference

What Australia/Adelaide covers

Country roster

Australia

Common abbreviations

ACDT ACST

Abbreviations rotate with each DST transition — anchor calendar entries to the IANA zone, not an abbreviation.

Peer zones at UTC+09:30 right now

Australia/Darwin

Same-offset peers can drift apart later in the year if their DST rules differ; today's offset match is not a permanent equivalence.

Top cities in Australia/Adelaide (by population)

Adelaide Adelaide Hills Mount Gambier Morphett Vale

DST mismatch radar

Meetings can drift when regions change daylight saving time on different weekends. This radar calls out those risk windows.

Upcoming DST shifts

United States

Fall back 1h

2026-11-01

European Union

Fall back 1h

2026-10-25

United States

Spring forward 1h

2027-03-14

European Union

Spring forward 1h

2027-03-28

Australia

Spring forward 1h

2026-10-04

Meetings at risk

New York ↔ London

7d mismatch

EU falls back a week before US

2026-10-25 → 2026-11-01

New York ↔ London

14d mismatch

US springs forward two weeks before EU

2027-03-14 → 2027-03-28

New York ↔ Sydney

28d mismatch

Sydney shifts while the US is still on DST

2026-10-04 → 2026-11-01

Holidays in Australia Airports in Australia

Cities in ACST

Adelaide Adelaide Hills Morphett Vale Mount Gambier

FAQ

What is the current UTC offset for Australia/Adelaide?: Australia/Adelaide is currently at UTC+09:30 (GMT+9:30). The page revalidates weekly, but live clocks on this page tick from the IANA zone in real time.
Does Australia/Adelaide observe daylight saving time in 2026?: Yes. Australia/Adelaide has 2 scheduled transitions in the next 12 months. The first is October 4, 2026 (UTC+09:30 → UTC+10:30, +1h). Anchor saved timestamps to the IANA zone, not to a fixed UTC offset, so they survive the change automatically.
Which cities use Australia/Adelaide?: Australia/Adelaide is the canonical clock for cities including Adelaide, Adelaide Hills, Mount Gambier, Morphett Vale. The page lists 4 indexable cities in this zone after locale and crawl-safety filters.
What abbreviations does Australia/Adelaide use?: Australia/Adelaide resolves to ACDT, ACST across the next 12 months — the abbreviation rotates with each DST transition. Calendar entries should anchor to the IANA zone instead of an abbreviation so the right offset is used in each window.
Why does Australia use Australia/Adelaide?: Australia is mapped to Australia/Adelaide as one of its IANA zones in the country-zone catalog. The IANA zone records each jurisdiction's historical offset and DST rule changes; Australia/Adelaide stores the rules used by Australia (ISO AU).

Timezone method

How we calculate this: Current offset and abbreviation come from date-fns-tz applied to the IANA zone ID (Australia/Adelaide). DST transitions are detected by sweeping the next 12 months and binary-searching the offset boundary on each day where the offset changes; the year-of-DST table is the unfiltered output of that sweep.
Data sources: IANA Time Zone Database (tzdata) for offset rules and DST policy; Australia/Adelaide resolves through the system Intl/Zone implementation in Node.js. City coverage from src/data/cities.json; country roster from src/data/countries.json; abbreviation list from src/data/abbreviations.json.
Update cadence: Page revalidates weekly (revalidate = 604800). Static rebuilds pick up tzdata version bumps when the application is redeployed; the 12-month transition window is recomputed on every revalidation pass.

Reference data for Australia/Adelaide

Reference fields include Australia/Adelaide: IANA zone ID, current offset and abbreviation, DST transition dates, peer zones, country roster, and top cities.

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Browse city pages

Use the human-readable city index if the next question is really about a city, not a zone string.

Australia/Adelaide.

What Australia/Adelaide is useful for

Zone identity

DST behavior

City coverage

Conversion handoff

Adjacent planning context

Abbreviations across the year

Offset stability

Peer zones at the same offset

Country roster

Australia/Adelaide source-change evidence

IANA identity

Current runtime offset

Transition watch

Policy source

Coverage proof

Abbreviation risk

Same-offset drift

Change-source boundary

Calendar storage

Policy-change review

Duplicate avoidance

When timezone policy changes

Machine-readable rule source

Policy-source boundary

Australia/Adelaide across the next 12 months

What Australia/Adelaide covers

DST mismatch radar

Upcoming DST shifts

Meetings at risk

Cities in ACST

FAQ

Related timezone pages

Never miss a launch, finale, or eclipse.

Australia/Adelaide.

What Australia/Adelaide is useful for

Zone identity

DST behavior

City coverage

Conversion handoff

Adjacent planning context

Abbreviations across the year

Offset stability

Peer zones at the same offset

Country roster

Australia/Adelaide source-change evidence

IANA identity

Current runtime offset

Transition watch

Policy source

Coverage proof

Abbreviation risk

Same-offset drift

Change-source boundary

Calendar storage

Policy-change review

Duplicate avoidance

When timezone policy changes

Machine-readable rule source

Policy-source boundary

Australia/Adelaide across the next 12 months

What Australia/Adelaide covers

DST mismatch radar

Upcoming DST shifts

Meetings at risk

Cities in ACST

FAQ

Related timezone pages