What is the current UTC offset for Australia/Adelaide?

Australia/Adelaide is currently at UTC+10:30 (GMT+10:30). 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 2027?

Yes. Australia/Adelaide has 2 scheduled transitions in the next 12 months. The first is April 4, 2027 (UTC+10:30 → UTC+09:30, -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.

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: April 4, 2027 (UTC+10:30 → UTC+09:30, -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+09:30 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.

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.

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
April 4, 2027	2:00 AM	UTC+10:30 (GMT+10:30)	UTC+09:30 (GMT+9:30)	-1h
October 3, 2027	3:00 AM	UTC+09:30 (GMT+9:30)	UTC+10:30 (GMT+10:30)	+1h

Offset window

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

149 days

Offset window

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

182 days

Offset window

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

34 days

Primary offset across the window: UTC+09:30 (GMT+9:30) 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.

Top cities in Australia/Adelaide (by population)

Adelaide Adelaide Hills Mount Gambier Morphett Vale

DST mismatch radar

Meetings drift when regions change their clocks on different weekends. Dates below are computed from the IANA time zone rules as of 5 Nov 2026.

Upcoming DST shifts

United States and Canada
Clocks go forward 1 hour · UTC-05:00 → UTC-04:00
Sun 14 Mar 2027
UK and European Union
Clocks go forward 1 hour · UTC+00:00 → UTC+01:00
Sun 28 Mar 2027
New Zealand
Clocks go back 1 hour · UTC+13:00 → UTC+12:00
Sun 4 Apr 2027
South-east Australia
Clocks go back 1 hour · UTC+11:00 → UTC+10:00
Sun 4 Apr 2027

Meetings at risk

New York ↔ London
- Sun 14 Mar 2027 (New York changes)5 h → 4 h
- Sun 28 Mar 2027 (London changes)4 h → 5 h
- Sun 31 Oct 2027 (London changes)5 h → 4 h
- Sun 7 Nov 2027 (New York changes)4 h → 5 h
4 h instead of 5 h for 14 days, Sun 14 Mar 2027 to Sun 28 Mar 2027.
4 h instead of 5 h for 7 days, Sun 31 Oct 2027 to Sun 7 Nov 2027.
New York ↔ Sydney
- Sun 14 Mar 2027 (New York changes)16 h → 15 h
- Sun 4 Apr 2027 (Sydney changes)15 h → 14 h
- Sun 3 Oct 2027 (Sydney changes)14 h → 15 h
- Sun 7 Nov 2027 (New York changes)15 h → 16 h
London ↔ Sydney
- Sun 28 Mar 2027 (London changes)11 h → 10 h
- Sun 4 Apr 2027 (Sydney changes)10 h → 9 h
- Sun 3 Oct 2027 (Sydney changes)9 h → 10 h
- Sun 31 Oct 2027 (London changes)10 h → 11 h

Each gap is how many hours the second city is ahead of the first.

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+10:30 (GMT+10:30). 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 2027?: Yes. Australia/Adelaide has 2 scheduled transitions in the next 12 months. The first is April 4, 2027 (UTC+10:30 → UTC+09:30, -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.

Related timezone pages

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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.