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Australia/Adelaide

Australia/Adelaide is the IANA time zone for South Australia in Australia.

UTC+09:30

Tue, Sep 29 UTC+9:30 ACST

Offsets and daylight saving time

Standard offset
UTC+09:30
Daylight offset
UTC+10:30
Rule
Daylight saving time from the first Sunday in October at 02:00 to the first Sunday in April at 03:00 (local time).

Next clock changes

  • Sunday, October 4, 2026 at 02:00: forward to UTC+10:30 (ACST → ACDT)
  • Sunday, April 4, 2027 at 03:00: back to UTC+9:30 (ACDT → ACST)

Names

Generic name
Australian Central Time
Abbreviation
ACST / ACDT
Standard / daylight
Australian Central Standard Time / Australian Central Daylight Time
Aliases
Australia/South (old ids that resolve to Australia/Adelaide)

Use it in code

// JavaScript
new Intl.DateTimeFormat('en-US', { timeZone: 'Australia/Adelaide' })

# Python
from zoneinfo import ZoneInfo
ZoneInfo('Australia/Adelaide')

-- PostgreSQL
SELECT now() AT TIME ZONE 'Australia/Adelaide';

Cities in Australia/Adelaide

Offset history since 1970

  • 1970: UTC+9:30
  • 1971–2026: UTC+9:30 and UTC+10:30 each year

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