Australian Central Standard Time (ACST)
Australian Central Standard Time (ACST) is UTC+9:30. It is the standard (winter) time of South Australia (Adelaide) and Northern Territory (Darwin, all year); in summer the same area uses ACDT (UTC+10:30).
ACST is not in force right now – the zone is currently on ACDT (UTC+10:30).
Convert ACST
Where ACST is used
South Australia (Adelaide) and Northern Territory (Darwin, all year).
Major cities on Australia/Adelaide
ACST and daylight saving time
The next change is on 4 April 2027 at 02:59 local time: clocks go back one hour, from ACDT (UTC+10:30) to ACST (UTC+9:30).
ACST FAQ
What is ACST?
Australian Central Standard Time (ACST) is UTC+9:30. It is the standard (winter) time of South Australia (Adelaide) and Northern Territory (Darwin, all year); in summer the same area uses ACDT (UTC+10:30).
What is the current ACST time?
ACST is UTC+9:30. The live clock on this page shows the current Australian Central Standard Time time, updated every second.
What is the difference between ACST and ACDT?
ACDT is one hour ahead of ACST. ACST is the standard time; ACDT is used during daylight saving time.
Which countries use ACST?
ACST is used in South Australia (Adelaide) and Northern Territory (Darwin, all year).
Updated 7 November 2026. Time zone data: IANA tz database.