What time is it in Sydney when it's 9 AM in Seoul?

10:00 AM — as of 2 October 2026. Sydney is 1 hour ahead of Seoul.

Does the time difference between Seoul and Sydney change?

Yes. In 2026 it's 2 hours or 1 hour, depending on the date, because only Sydney changes its clocks.

What's the best time for a call between Seoul and Sydney?

Between 09:00 and 16:00 Seoul time, when both cities are in working hours (09:00–17:00).

What time zones are Seoul and Sydney in?

Seoul uses Asia/Seoul (UTC+9 today); Sydney uses Australia/Sydney (UTC+10 today).

Time difference between Seoul and Sydney

Sydney is 1 hour ahead of Seoul. When it's 9:00 in Seoul, it's 10:00 in Sydney.

From

Sydney is 1 hour ahead of Seoul.

On Friday, 2 October 2026, 09:00 in Seoul is 10:00 in Sydney. Seoul is UTC+9; Sydney is UTC+10.

The gap through 2026

1 Jan – 4 AprSydney is 2 hours ahead of Seoul.
4 Apr – 3 OctSydney is 1 hour ahead of Seoul.
3 Oct – 31 DecSydney is 2 hours ahead of Seoul.

Sydney moves its clocks back on 4 April (UTC+11 → UTC+10).
Sydney moves its clocks forward on 3 October (UTC+10 → UTC+11).

Seoul to Sydney, hour by hour

On Friday 2 October.

Seoul	Sydney
07:00 Early morning	08:00 Early morning
08:00 Early morning	09:00 Working hours
09:00 Working hours	10:00 Working hours
10:00 Working hours	11:00 Working hours
11:00 Working hours	12:00 Working hours
12:00 Working hours	13:00 Working hours
13:00 Working hours	14:00 Working hours
14:00 Working hours	15:00 Working hours
15:00 Working hours	16:00 Working hours
16:00 Working hours	17:00 Evening
17:00 Evening	18:00 Evening
18:00 Evening	19:00 Evening
19:00 Evening	20:00 Evening
20:00 Evening	21:00 Evening
21:00 Evening	22:00 Sleeping hours
22:00 Sleeping hours	23:00 Sleeping hours

Daylight saving in 2026

Sydney moves its clocks back on Saturday 4 April (UTC+11 → UTC+10).
Sydney moves its clocks forward on Saturday 3 October (UTC+10 → UTC+11).

1 Jan – 4 AprSydney is 2 hours ahead of Seoul.
4 Apr – 3 OctSydney is 1 hour ahead of Seoul.
3 Oct – 31 DecSydney is 2 hours ahead of Seoul.

Best times for a call

Working hours (09:00–17:00) overlap for 7 hours: 09:00–16:00 in Seoul, which is 10:00–17:00 in Sydney.

Seoul 09:00Working hoursSydney 10:00Working hours
Seoul 10:00Working hoursSydney 11:00Working hours
Seoul 11:00Working hoursSydney 12:00Working hours

How the time difference calculator works

The difference is each city's offset from UTC on the date you pick, subtracted. Offsets come from the IANA time zone database in your browser.

Because countries change their clocks on different dates — or not at all — the gap between two cities can change for a few weeks a year. The calculator lists every change in the year.

Examples

London is 5 hours ahead of New York for most of the year, but only 4 hours ahead for about three weeks in March and one week in late October.
Dubai doesn't change its clocks, so its gap to London is 4 hours in winter and 3 hours in summer.

Good for

Knowing when a colleague's day starts
Setting expectations for replies across time zones
Planning travel and jet lag

Frequently asked questions

What time is it in Sydney when it's 9 AM in Seoul?: 10:00 AM — as of 2 October 2026. Sydney is 1 hour ahead of Seoul.
Does the time difference between Seoul and Sydney change?: Yes. In 2026 it's 2 hours or 1 hour, depending on the date, because only Sydney changes its clocks.
What's the best time for a call between Seoul and Sydney?: Between 09:00 and 16:00 Seoul time, when both cities are in working hours (09:00–17:00).
What time zones are Seoul and Sydney in?: Seoul uses Asia/Seoul (UTC+9 today); Sydney uses Australia/Sydney (UTC+10 today).

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