Seoul to Sydney
These two are not a fixed distance apart. The gap is +1h, +2h at different points in the year, and it changes 3 times.
Reading your clock…
Every gap between Seoul and Sydney, with dates
This is the table other converters do not show. Each row is a stretch of the year during which the difference is a particular number. Dates are Seoul's local dates.
| From | Until | Sydney is | Length |
|---|---|---|---|
| Tuesday, 1 September 2026 | Saturday, 3 October 2026 | 1 hour ahead | 33 days |
| Sunday, 4 October 2026 | Saturday, 3 April 2027 | 2 hours ahead | 182 days |
| Sunday, 4 April 2027 | Saturday, 2 October 2027 | 1 hour ahead | 182 days |
| Sunday, 3 October 2027 | onwards | 2 hours ahead | — |
The highlighted row is the one to watch. For 182 days from Sunday, 4 October 2026, the difference is 2 hours ahead rather than the usual figure. A weekly call booked outside that window arrives an hour off inside it.
Seoul hours converted to Sydney
As at Monday, 14 September 2026. Use the converter above for any other day — and if the table of gaps says the difference changes, these numbers change with it.
| Seoul | Sydney |
|---|---|
| 07:00 | 08:00 |
| 08:00 | 09:00 |
| 09:00 | 10:00 |
| 10:00 | 11:00 |
| 11:00 | 12:00 |
| 12:00 | 13:00 |
| 13:00 | 14:00 |
| 14:00 | 15:00 |
| 15:00 | 16:00 |
| 16:00 | 17:00 |
| 17:00 | 18:00 |
| 18:00 | 19:00 |
| 19:00 | 20:00 |
| 20:00 | 21:00 |
Sydney
Australia/Sydney
Changes clocks twice a year, between UTC+10:00 and UTC+11:00. Next change Sunday, 4 October 2026.
When Seoul and Sydney can actually talk
On a standard 09:00–17:00 day in both cities, the working hours overlap for 7 hours. That window is 09:00–16:00 in Seoul, which is 10:00–17:00 in Sydney.
That is comfortable: there is room for a recurring call without either side moving their day.
Calculated for Monday, 14 September 2026. Because the gap changes during the year, this window moves with it — the planner recomputes it for any date you pick.
Questions
Seoul and Sydney, explained
What is the time difference between Seoul and Sydney?
There is no single answer, which is why most converters get this wrong for part of the year. Sydney is 1 hour ahead, 2 hours ahead relative to Seoul at different points in the year. Right now it is 1 hour ahead. The table on this page gives the exact dates for each.
Why does the difference between Seoul and Sydney change?
Seoul stays on UTC+09:00 all year, while Sydney moves between UTC+10:00 and UTC+11:00. A gap only stays fixed when both ends are fixed. Here one end moves, so the difference moves with it even though nothing changed at the other end.
When is the difference between Seoul and Sydney unusual?
The shortest window runs from Sunday, 4 October 2026 to Saturday, 3 April 2027 — 182 days during which Sydney is 2 hours ahead relative to Seoul rather than the usual amount. Short windows like this are where recurring meetings break, because nobody thinks to check.
Does this account for daylight saving automatically?
Yes. Offsets come from your device's own copy of the IANA time zone database through the browser's Intl API, so they reflect whatever rules are current rather than a table bundled here that could go stale. Pick any date in the converter and it resolves that date's rules, not today's.