One hour or two? Choose the date.
Seoul uses Korea Standard Time, UTC+9. Sydney uses UTC+10 during standard time and UTC+11 during daylight saving, so Sydney is one or two hours ahead of Seoul.
The comparison above starts with an example date. Select your actual date and move the Seoul-time slider to see both local dates, times and UTC offsets. It calculates the same instant in Asia/Seoul and Australia/Sydney.
Sydney changes its clocks. Seoul does not currently.
New South Wales starts daylight saving on the first Sunday in October and ends it on the first Sunday in April. The clock change happens during the night, so the difference can change within the transition date.
For example, Sydney moves from 02:00 AEST to 03:00 AEDT on 4 October 2026. Check the comparison at the time you intend to call, not just the date.
Compare a call time, then make it yours.
Seoul 18:00 corresponds to Sydney 19:00 in standard time or 20:00 during daylight saving. These are conversion examples, not a recommendation about anyone’s availability.
- Choose the call date above.
- Move the slider to the proposed hour in Seoul. Check the Sydney date as well as the clock time.
- Select Open this comparison in Time. The app previews the two cities and the selected instant.
- Choose Create a comparison profile to save these cities in a separate profile. Your existing profiles stay available.
Common questions
Is all of Australia on Sydney time? No. Australian states and territories use different time zones and do not all observe daylight saving. Choose the actual city.
Does the ring show geographic distance? No. It shows each favorite’s local position within a 24-hour day.