What is ACST in BST?
British Time is 10 hours 30 minutes behind
Convert a time
GMT — British Time
7:30 am
GMT, Sat
- Time in Adelaide
- 6:59:05 PM
- Time in London
- 8:29:05 AM
- Difference
- −10:30 h
- Next clock change
- March 28, 2027
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 – March 28, 2027British Time is 10 hours 30 minutes behind
- March 28, 2027 – April 4, 2027British Time is 9 hours 30 minutes behind
- April 4, 2027 – October 3, 2027British Time is 8 hours 30 minutes behind
- October 3, 2027 – October 31, 2027British Time is 9 hours 30 minutes behind
- October 31, 2027 – onwardsBritish Time is 10 hours 30 minutes behind
Periods shorter than a day are not listed. Each zone changes at its own local time, so on a date when both move there are a few hours when the gap is briefly something else.
Daylight saving
Australian Central Time
Clocks go back one hour — 3:00 am becomes 2:00 am local time, and the zone is on ACST after that.
British Time
Clocks go forward one hour — 1:00 am becomes 2:00 am local time, and the zone is on BST after that.
ACST to BST conversion table
Every hour of Saturday, November 7, 2026, converted from Australian Central Time to British Time. 11 of the 24 hours fall on a different calendar day in London, which is marked.
- 12:00 am ACDT
- 1:30 pm GMT−1 day
- 1:00 am ACDT
- 2:30 pm GMT−1 day
- 2:00 am ACDT
- 3:30 pm GMT−1 day
- 3:00 am ACDT
- 4:30 pm GMT−1 day
- 4:00 am ACDT
- 5:30 pm GMT−1 day
- 5:00 am ACDT
- 6:30 pm GMT−1 day
- 6:00 am ACDT
- 7:30 pm GMT−1 day
- 7:00 am ACDT
- 8:30 pm GMT−1 day
- 8:00 am ACDT
- 9:30 pm GMT−1 day
- 9:00 am ACDT
- 10:30 pm GMT−1 day
- 10:00 am ACDT
- 11:30 pm GMT−1 day
- 11:00 am ACDT
- 12:30 am GMT
- 12:00 pm ACDT
- 1:30 am GMT
- 1:00 pm ACDT
- 2:30 am GMT
- 2:00 pm ACDT
- 3:30 am GMT
- 3:00 pm ACDT
- 4:30 am GMT
- 4:00 pm ACDT
- 5:30 am GMT
- 5:00 pm ACDT
- 6:30 am GMT
- 6:00 pm ACDT
- 7:30 am GMT
- 7:00 pm ACDT
- 8:30 am GMT
- 8:00 pm ACDT
- 9:30 am GMT
- 9:00 pm ACDT
- 10:30 am GMT
- 10:00 pm ACDT
- 11:30 am GMT
- 11:00 pm ACDT
- 12:30 pm GMT
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 (ACDT) is used in South Australia and the Northern Territory, on a half-hour offset from the east coast
British Time (GMT) 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.
Other conversions
- BST to ACST
- ACST to UTC
- ACST to GMT
- ACST to EST
- ACST to CST
- ACST to MST
- ACST to PST
- ACST to AKST
- ACST to HST
- ACST to CET
- ACST to IST
- ACST to CST (China)
- ACST to JST
- ACST to AEST
- ACST to AST
- ACST to Mexico City
- ACST to BRT
- ACST to ART
- ACST to EET
- ACST to WET
- ACST to MSK
- ACST to TRT
- ACST to SAST
- ACST to WAT
- ACST to EAT
- ACST to GST
- ACST to PKT
- ACST to ICT
- ACST to WIB
- ACST to SGT
- ACST to HKT
- ACST to KST
- ACST to PHT
- ACST to AWST
- ACST to NZST
- All zones