What is ACST in KST?

Korea Standard Time is 30 minutes behind

Australian Central Time is on UTC+9:30 and Korea Standard Time is on UTC+9:00 right now. The gap changes during the year — see below.

Time in Adelaide: 10:22:44 PM
Time in Seoul: 9:52:44 PM
Difference: −0:30 h
Next clock change: October 4, 2026

Convert a time

ACST — Australian Central Time

KST — Korea Standard Time

9:30 pm

KST, Fri

When the difference changes

Australian Central Time and Korea Standard 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 4, 2026Korea Standard Time is 30 minutes behind
October 4, 2026 – April 4, 2027Korea Standard Time is 1 hour 30 minutes behind
April 4, 2027 – October 3, 2027Korea Standard Time is 30 minutes behind
October 3, 2027 – onwardsKorea Standard Time is 1 hour 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

Sunday, October 4, 2026

Clocks go forward one hour — 2:00 am becomes 3:00 am local time, and the zone is on ACDT after that.

Korea Standard Time

No clock changes

Korea Standard Time stays on KST all year, so its offset from UTC never moves.

ACST to KST conversion table

Every hour of Friday, September 25, 2026, converted from Australian Central Time to Korea Standard Time. 1 of the 24 hours fall on a different calendar day in Seoul, which is marked.

12:00 am ACST: 11:30 pm KST−1 day
1:00 am ACST: 12:30 am KST
2:00 am ACST: 1:30 am KST
3:00 am ACST: 2:30 am KST
4:00 am ACST: 3:30 am KST
5:00 am ACST: 4:30 am KST
6:00 am ACST: 5:30 am KST
7:00 am ACST: 6:30 am KST
8:00 am ACST: 7:30 am KST
9:00 am ACST: 8:30 am KST
10:00 am ACST: 9:30 am KST
11:00 am ACST: 10:30 am KST

12:00 pm ACST: 11:30 am KST
1:00 pm ACST: 12:30 pm KST
2:00 pm ACST: 1:30 pm KST
3:00 pm ACST: 2:30 pm KST
4:00 pm ACST: 3:30 pm KST
5:00 pm ACST: 4:30 pm KST
6:00 pm ACST: 5:30 pm KST
7:00 pm ACST: 6:30 pm KST
8:00 pm ACST: 7:30 pm KST
9:00 pm ACST: 8:30 pm KST
10:00 pm ACST: 9:30 pm KST
11:00 pm ACST: 10:30 pm KST

Scheduling between the two

Working hours overlap from 10:00 am to 6:00 pm ACST, which is 9:30 am to 5:30 pm KST. Anything inside that window falls in the normal working day at both ends.

Australian Central Time (ACST) is used in South Australia and the Northern Territory, on a half-hour offset from the east coast