What is ACST in UTC?
Coordinated Universal Time is 9 hours 30 minutes behind
Australian Central Time is on UTC+9:30 and Coordinated Universal Time is on UTC+0:00 right now. The gap changes during the year — see below.
- Time in Adelaide
- 11:44 am
- Time in the prime meridian
- 2:14 am
- Difference
- −9:30 h
- Next clock change
- October 3, 2026
Convert a time
UTC — Coordinated Universal Time
1:30 am
Wed
When the difference changes
Australian Central Time and Coordinated Universal Time do not change their clocks on the same dates, so the gap between them is not the same all year. Most converters show only today’s figure. These are the periods ahead:
- Now – October 3, 2026Coordinated Universal Time is 9 hours 30 minutes behind
- October 3, 2026 – April 3, 2027Coordinated Universal Time is 10 hours 30 minutes behind
- April 3, 2027 – October 2, 2027Coordinated Universal Time is 9 hours 30 minutes behind
- October 2, 2027 – onwardsCoordinated Universal Time is 10 hours 30 minutes behind
Periods shorter than a day are not listed: both zones change at 2am in their own local time, so there are a few hours on each transition date when the gap is briefly something else.
Daylight saving
Australian Central Time
Clocks go forward one hour at 2am local time, becoming ACDT.
Coordinated Universal Time
Coordinated Universal Time stays on UTC all year, so its offset from UTC never moves.
ACST to UTC conversion table
Every hour of Wednesday, September 23, 2026, converted from Australian Central Time to Coordinated Universal Time. 10 of the 24 hours fall on a different calendar day in the prime meridian, which is marked.
- 12:00 am ACST
- 2:30 pm UTC−1 day
- 1:00 am ACST
- 3:30 pm UTC−1 day
- 2:00 am ACST
- 4:30 pm UTC−1 day
- 3:00 am ACST
- 5:30 pm UTC−1 day
- 4:00 am ACST
- 6:30 pm UTC−1 day
- 5:00 am ACST
- 7:30 pm UTC−1 day
- 6:00 am ACST
- 8:30 pm UTC−1 day
- 7:00 am ACST
- 9:30 pm UTC−1 day
- 8:00 am ACST
- 10:30 pm UTC−1 day
- 9:00 am ACST
- 11:30 pm UTC−1 day
- 10:00 am ACST
- 12:30 am UTC
- 11:00 am ACST
- 1:30 am UTC
- 12:00 pm ACST
- 2:30 am UTC
- 1:00 pm ACST
- 3:30 am UTC
- 2:00 pm ACST
- 4:30 am UTC
- 3:00 pm ACST
- 5:30 am UTC
- 4:00 pm ACST
- 6:30 am UTC
- 5:00 pm ACST
- 7:30 am UTC
- 6:00 pm ACST
- 8:30 am UTC
- 7:00 pm ACST
- 9:30 am UTC
- 8:00 pm ACST
- 10:30 am UTC
- 9:00 pm ACST
- 11:30 am UTC
- 10:00 pm ACST
- 12:30 pm UTC
- 11:00 pm ACST
- 1:30 pm UTC
Scheduling between the two
There is no overlap between a nine-to-six working day in Adelaide and one in the prime meridian — the gap is too wide. A call has to sit early or late for one side. Early morning in Adelaide is the usual compromise, since that is late afternoon or evening in the prime meridian.
Australian Central Time (ACST) is used in South Australia and the Northern Territory, on a half-hour offset from the east coast
Coordinated Universal Time (UTC) is used in aviation, computing, and science worldwide. UTC never changes for daylight saving.