What is BST in ACST?
Australian Central Time is 8 hours 30 minutes ahead
British Time is on UTC+1:00 and Australian Central Time is on UTC+9:30 right now. British Time is on daylight saving, so its clocks read BST. The gap changes during the year — see below.
- Time in London
- 3:56 am
- Time in Adelaide
- 12:26 pm
- Difference
- +8:30 h
- Next clock change
- October 3, 2026
Convert a time
ACST — Australian Central Time
11:30 am
Wed
When the difference changes
British Time and Australian Central 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, 2026Australian Central Time is 8 hours 30 minutes ahead
- October 3, 2026 – October 25, 2026Australian Central Time is 9 hours 30 minutes ahead
- October 25, 2026 – March 28, 2027Australian Central Time is 10 hours 30 minutes ahead
- March 28, 2027 – April 3, 2027Australian Central Time is 9 hours 30 minutes ahead
- April 3, 2027 – October 2, 2027Australian Central Time is 8 hours 30 minutes ahead
- October 2, 2027 – onwardsAustralian Central Time is 9 hours 30 minutes ahead
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
British Time
Clocks go back one hour at 2am local time, becoming GMT.
Australian Central Time
Clocks go forward one hour at 2am local time, becoming ACDT.
BST to ACST conversion table
Every hour of Wednesday, September 23, 2026, converted from British Time to Australian Central Time. 8 of the 24 hours fall on a different calendar day in Adelaide, which is marked.
- 12:00 am BST
- 8:30 am ACST
- 1:00 am BST
- 9:30 am ACST
- 2:00 am BST
- 10:30 am ACST
- 3:00 am BST
- 11:30 am ACST
- 4:00 am BST
- 12:30 pm ACST
- 5:00 am BST
- 1:30 pm ACST
- 6:00 am BST
- 2:30 pm ACST
- 7:00 am BST
- 3:30 pm ACST
- 8:00 am BST
- 4:30 pm ACST
- 9:00 am BST
- 5:30 pm ACST
- 10:00 am BST
- 6:30 pm ACST
- 11:00 am BST
- 7:30 pm ACST
- 12:00 pm BST
- 8:30 pm ACST
- 1:00 pm BST
- 9:30 pm ACST
- 2:00 pm BST
- 10:30 pm ACST
- 3:00 pm BST
- 11:30 pm ACST
- 4:00 pm BST
- 12:30 am ACST+1 day
- 5:00 pm BST
- 1:30 am ACST+1 day
- 6:00 pm BST
- 2:30 am ACST+1 day
- 7:00 pm BST
- 3:30 am ACST+1 day
- 8:00 pm BST
- 4:30 am ACST+1 day
- 9:00 pm BST
- 5:30 am ACST+1 day
- 10:00 pm BST
- 6:30 am ACST+1 day
- 11:00 pm BST
- 7:30 am ACST+1 day
Scheduling between the two
Working hours overlap from 9:00 am to 10:00 am BST, which is 5:30 pm to 6:30 pm ACST. Anything inside that window falls in the normal working day at both ends.
A note on BST: it can also mean Bangladesh Standard Time (UTC+6). This page means British Summer Time.
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.
Australian Central Time (ACST) is used in South Australia and the Northern Territory, on a half-hour offset from the east coast