Seoul is currently 1 hour behind Sydney. Convert time between Seoul and Sydney, see the exact difference, and find the best hours for calls and meetings.
Seoul uses Korean Standard Time. Sydney uses Australian Eastern Standard Time. Seoul time is 1 hour behind Sydney. So, when it is 12:00 AM in Seoul, it is 1:00 AM in Sydney.
Common Seoul times and their Sydney equivalents.
| Seoul Time | Sydney Time |
|---|---|
| 12:00 AM Seoul | 1:00 AM Sydney |
| 1:00 AM Seoul | 2:00 AM Sydney |
| 2:00 AM Seoul | 3:00 AM Sydney |
| 3:00 AM Seoul | 4:00 AM Sydney |
| 4:00 AM Seoul | 5:00 AM Sydney |
| 5:00 AM Seoul | 6:00 AM Sydney |
| 6:00 AM Seoul | 7:00 AM Sydney |
| 7:00 AM Seoul | 8:00 AM Sydney |
| 8:00 AM Seoul | 9:00 AM Sydney |
| 9:00 AM Seoul | 10:00 AM Sydney |
| 10:00 AM Seoul | 11:00 AM Sydney |
| 11:00 AM Seoul | 12:00 PM Sydney |
| 12:00 PM Seoul | 1:00 PM Sydney |
| 1:00 PM Seoul | 2:00 PM Sydney |
| 2:00 PM Seoul | 3:00 PM Sydney |
| 3:00 PM Seoul | 4:00 PM Sydney |
| 4:00 PM Seoul | 5:00 PM Sydney |
| 5:00 PM Seoul | 6:00 PM Sydney |
| 6:00 PM Seoul | 7:00 PM Sydney |
| 7:00 PM Seoul | 8:00 PM Sydney |
| 8:00 PM Seoul | 9:00 PM Sydney |
| 9:00 PM Seoul | 10:00 PM Sydney |
| 10:00 PM Seoul | 11:00 PM Sydney |
| 11:00 PM Seoul | 12:00 AM Sydney |
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.
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.
Both Seoul and Sydney 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 | Seoul | Sydney | Offset |
|---|---|---|---|---|
| Nov – Mar | Both on standard time | GMT+9 (UTC+9) | GMT+11 (UTC+11) | 2 hours |
| Mar – late Mar | US clocks forward, some zones still on standard | GMT+9 (UTC+9) | GMT+11 (UTC+11) | 2 hours |
| Late Mar – Oct current | Both on summer / daylight time | GMT+9 (UTC+9) | GMT+10 (UTC+10) | 1 hour |
| Late Oct – early Nov | Clocks transitioning — check exact date | GMT+9 (UTC+9) | GMT+11 (UTC+11) | 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.
Seoul is currently 1 hour behind Sydney. Seoul uses Korean Standard Time (UTC+9) and Sydney uses Australian Eastern Standard Time (UTC+10).
The best overlap window is 9:00 am–5:00 pm Seoul time, which corresponds to 10:00 am–6:00 pm Sydney time. Both cities are within standard business hours (9 am–6 pm) during this window.
When it is 9:00 AM in Seoul, it is 10:00 am in Sydney. Seoul is 1 hour behind Sydney.
When it is 5:00 PM in Sydney, it is 4:00 pm in Seoul.
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. Always verify the current offset when scheduling meetings near DST transition dates.