What is the time difference between Seoul and Sydney?

Sydney is 1 hour ahead of Seoul. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.

When is the best time to call Sydney from Seoul?

Between 09:00–17:00 in Seoul, which is 10:00–18:00 in Sydney. That is the only stretch where both cities are inside a 09:00–18:00 day.

Does Seoul observe daylight saving time?

No. Seoul stays on UTC+9 all year, so its clocks never move.

Does Sydney observe daylight saving time?

Yes. Sydney runs on UTC+10 in winter and UTC+11 in summer. The next change is on 2026-10-04, when clocks go forward by 60 minutes.

If it is midday in Seoul, what time is it in Sydney?

It is 13:00 in Sydney, on the same calendar date. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.

Which time zones do Seoul and Sydney use?

Seoul uses Asia/Seoul, currently UTC+9, and Sydney uses Australia/Sydney, currently UTC+10 (AEST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.

Convert Seoul time to Sydney time

Sydney is 1 hour ahead of Seoul right now, so midday in Seoul lands in the afternoon in Sydney.

Convert a time

From

Date

Time

Converted time

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The converter needs JavaScript to run. Everything below — offsets, daylight saving dates and the hour-by-hour table — is part of the page and works without it.

Hour by hour

Every hour of a day in Seoul, and what the clock reads in Sydney at that same moment.

Seoul	Sydney
00:00	01:00
01:00	02:00
02:00	03:00
03:00	04:00
04:00	05:00
05:00	06:00
06:00	07:00
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
21:00	22:00
22:00	23:00
23:00	00:00next day

Daylight saving time

Sydney changes its clocks; Seoul does not. The difference between them therefore shifts by an hour twice a year.

Seoul

Does not observe daylight saving time

Standard: UTC+9

Sydney

Observes daylight saving time

Standard: UTC+10
Daylight: UTC+11
Next change: 2026-10-04 +60m

When you can actually talk

The window is 8 hours wide — 09:00–17:00 in Seoul, 10:00–18:00 in Sydney.

Seoul 09:00–17:00Sydney 10:00–18:00

Reference

The underlying data, in case you need to put it in a calendar invitation or a configuration file.

	Seoul	Sydney
IANA zone	Asia/Seoul	Australia/Sydney
Abbreviation	UTC+9	AEST
Standard offset	UTC+9	UTC+10
Daylight offset	—	UTC+11
Clock changes this year	0	2
Country	South Korea	Australia

Example, not the current time. Live times appear once the page loads.

Common questions

What is the time difference between Seoul and Sydney?: Sydney is 1 hour ahead of Seoul. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.
When is the best time to call Sydney from Seoul?: Between 09:00–17:00 in Seoul, which is 10:00–18:00 in Sydney. That is the only stretch where both cities are inside a 09:00–18:00 day.
Does Seoul observe daylight saving time?: No. Seoul stays on UTC+9 all year, so its clocks never move.
Does Sydney observe daylight saving time?: Yes. Sydney runs on UTC+10 in winter and UTC+11 in summer. The next change is on 2026-10-04, when clocks go forward by 60 minutes.
If it is midday in Seoul, what time is it in Sydney?: It is 13:00 in Sydney, on the same calendar date. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.
Which time zones do Seoul and Sydney use?: Seoul uses Asia/Seoul, currently UTC+9, and Sydney uses Australia/Sydney, currently UTC+10 (AEST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.