Sydney is currently 1 hour ahead of Seoul. Convert time between Sydney and Seoul, see the exact difference, and find the best hours for calls and meetings.
Sydney uses Australian Eastern Standard Time. Seoul uses Korean Standard Time. Sydney time is 1 hour ahead of Seoul. So, when it is 12:00 AM in Sydney, it is 11:00 PM in Seoul.
Common Sydney times and their Seoul equivalents.
| Sydney Time | Seoul Time |
|---|---|
| 12:00 AM Sydney | 11:00 PM Seoul |
| 1:00 AM Sydney | 12:00 AM Seoul |
| 2:00 AM Sydney | 1:00 AM Seoul |
| 3:00 AM Sydney | 2:00 AM Seoul |
| 4:00 AM Sydney | 3:00 AM Seoul |
| 5:00 AM Sydney | 4:00 AM Seoul |
| 6:00 AM Sydney | 5:00 AM Seoul |
| 7:00 AM Sydney | 6:00 AM Seoul |
| 8:00 AM Sydney | 7:00 AM Seoul |
| 9:00 AM Sydney | 8:00 AM Seoul |
| 10:00 AM Sydney | 9:00 AM Seoul |
| 11:00 AM Sydney | 10:00 AM Seoul |
| 12:00 PM Sydney | 11:00 AM Seoul |
| 1:00 PM Sydney | 12:00 PM Seoul |
| 2:00 PM Sydney | 1:00 PM Seoul |
| 3:00 PM Sydney | 2:00 PM Seoul |
| 4:00 PM Sydney | 3:00 PM Seoul |
| 5:00 PM Sydney | 4:00 PM Seoul |
| 6:00 PM Sydney | 5:00 PM Seoul |
| 7:00 PM Sydney | 6:00 PM Seoul |
| 8:00 PM Sydney | 7:00 PM Seoul |
| 9:00 PM Sydney | 8:00 PM Seoul |
| 10:00 PM Sydney | 9:00 PM Seoul |
| 11:00 PM Sydney | 10:00 PM Seoul |
Sydney uses Australian Eastern Standard Time (AEST, UTC+10) in winter and Australian Eastern Daylight Time (AEDT, UTC+11) in summer. Because Australia is in the Southern Hemisphere, its summer runs October–April — the opposite of the Northern Hemisphere. Clocks go forward on the first Sunday of October and back on the first Sunday of April.
Seoul uses Korea Standard Time (KST, UTC+9) year-round, identical to Tokyo in offset. South Korea does not observe Daylight Saving Time. The consistent UTC+9 offset means Seoul–Tokyo scheduling has zero drift throughout the year.
Both Sydney and Seoul may observe Daylight Saving Time, which means the offset between them can change twice a year. Here is what to expect each season.
| Period | Note | Sydney | Seoul | Offset |
|---|---|---|---|---|
| Nov – Mar | Both on standard time | GMT+11 (UTC+11) | GMT+9 (UTC+9) | 2 hours |
| Mar – late Mar | US clocks forward, some zones still on standard | GMT+11 (UTC+11) | GMT+9 (UTC+9) | 2 hours |
| Late Mar – Oct current | Both on summer / daylight time | GMT+10 (UTC+10) | GMT+9 (UTC+9) | 1 hour |
| Late Oct – early Nov | Clocks transitioning — check exact date | GMT+11 (UTC+11) | GMT+9 (UTC+9) | 2 hours |
The transition window typically lasts 1–2 weeks in spring and autumn. If you have a recurring weekly meeting near a clock change, verify the exact date to avoid a missed call.
Sydney is currently 1 hour ahead of Seoul. Sydney uses Australian Eastern Standard Time (UTC+10) and Seoul uses Korean Standard Time (UTC+9).
The best overlap window is 10:00 am–6:00 pm Sydney time, which corresponds to 9:00 am–5:00 pm Seoul time. Both cities are within standard business hours (9 am–6 pm) during this window.
When it is 9:00 AM in Sydney, it is 8:00 am in Seoul. Sydney is 1 hour ahead of Seoul.
When it is 5:00 PM in Seoul, it is 6:00 pm in Sydney.
Sydney observes Daylight Saving Time but Seoul does not. This means the offset between the two cities changes by one hour when Sydney transitions its clocks — typically in late March (spring forward) and late October (fall back). Always verify the current offset when scheduling around those dates.