What is ACST in BST?
British Time is 8 hours 30 minutes behind
Australian Central Time is on UTC+9:30 and British Time is on UTC+1:00 right now. British Time is on daylight saving, so its clocks read BST. The gap changes during the year — see below.
- Time in Adelaide
- 11:43 am
- Time in London
- 3:13 am
- Difference
- −8:30 h
- Next clock change
- October 3, 2026
Convert a time
BST — British Time
2:30 am
Wed
When the difference changes
Australian Central Time and British 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, 2026British Time is 8 hours 30 minutes behind
- October 3, 2026 – October 25, 2026British Time is 9 hours 30 minutes behind
- October 25, 2026 – March 28, 2027British Time is 10 hours 30 minutes behind
- March 28, 2027 – April 3, 2027British Time is 9 hours 30 minutes behind
- April 3, 2027 – October 2, 2027British Time is 8 hours 30 minutes behind
- October 2, 2027 – onwardsBritish Time is 9 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.
British Time
Clocks go back one hour at 2am local time, becoming GMT.
ACST to BST conversion table
Every hour of Wednesday, September 23, 2026, converted from Australian Central Time to British Time. 9 of the 24 hours fall on a different calendar day in London, which is marked.
- 12:00 am ACST
- 3:30 pm BST−1 day
- 1:00 am ACST
- 4:30 pm BST−1 day
- 2:00 am ACST
- 5:30 pm BST−1 day
- 3:00 am ACST
- 6:30 pm BST−1 day
- 4:00 am ACST
- 7:30 pm BST−1 day
- 5:00 am ACST
- 8:30 pm BST−1 day
- 6:00 am ACST
- 9:30 pm BST−1 day
- 7:00 am ACST
- 10:30 pm BST−1 day
- 8:00 am ACST
- 11:30 pm BST−1 day
- 9:00 am ACST
- 12:30 am BST
- 10:00 am ACST
- 1:30 am BST
- 11:00 am ACST
- 2:30 am BST
- 12:00 pm ACST
- 3:30 am BST
- 1:00 pm ACST
- 4:30 am BST
- 2:00 pm ACST
- 5:30 am BST
- 3:00 pm ACST
- 6:30 am BST
- 4:00 pm ACST
- 7:30 am BST
- 5:00 pm ACST
- 8:30 am BST
- 6:00 pm ACST
- 9:30 am BST
- 7:00 pm ACST
- 10:30 am BST
- 8:00 pm ACST
- 11:30 am BST
- 9:00 pm ACST
- 12:30 pm BST
- 10:00 pm ACST
- 1:30 pm BST
- 11:00 pm ACST
- 2:30 pm BST
Scheduling between the two
There is no overlap between a nine-to-six working day in Adelaide and one in London — 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 London.
A note on BST: it can also mean Bangladesh Standard Time (UTC+6). This page means British Summer Time.
Australian Central Time (ACST) is used in South Australia and the Northern Territory, on a half-hour offset from the east coast
British Time (BST) is used in the whole United Kingdom. In winter the UK is on GMT; from late March to late October it is on BST, an hour ahead.