Korea Standard Time (kst) is used in South Korea. The IANA timezone identifier is Asia/Seoul.

TOKYO (Tokyo) (tokyo) is used in Japan. The IANA timezone identifier is Asia/Tokyo.

KST to TOKYO Time Converter

Korea Standard Time → TOKYO (Tokyo)

KST = UTC+9TOKYO = UTC+9

ClockinSync

BASE

09:00

Work Clients Team +

00:0006:0012:0018:0024:00

Tokyo

Japan · UTC±0

09:00

London

United Kingdom · -8h

01:00

New York

USA · -13h

20:00-1 day

Dubai

United Arab Emirates · -5h

04:00

Sydney

Australia · +1h

10:00

Time difference: KST (Seoul) and Tokyo

KST (Seoul) and Tokyo are in the same timezone. Midday in KST (Seoul) lines up with 12:00 in Tokyo.

KST (Seoul) runs on Asia/Seoul; Tokyo runs on Asia/Tokyo. Together they are 0 hours apart.

Business hours comparison

There is a 8-hour window each day where both KST (Seoul) and Tokyo are within standard business hours (09:00–17:00).

00:0006:0012:0018:0024:00

KST (Seoul)

Tokyo

Overlap (8h)

Best times to schedule a meeting

There is a 8-hour daily window where both locations are in business hours. The 3 best slots are listed below.

09:00 Seoul / 09:00 Tokyo✓ Both working

10:00 Seoul / 10:00 Tokyo✓ Both working

11:00 Seoul / 11:00 Tokyo✓ Both working

Working hours defined as 09:00–17:00 local time for each location.

Upcoming public holidays

⚡ Watch out — upcoming holidays on both sides. Verify availability in advance.

KST (Seoul)7 holidays

Aug 15Liberation Day

Sep 24Chuseok

Sep 25Chuseok

Sep 26Chuseok

Oct 3National Foundation Day

Tokyo7 holidays

Jul 20Marine Day

Aug 11Mountain Day

Sep 21Respect for the Aged Day

Sep 23Autumnal Equinox Day

Oct 12Sports Day

How to work with KST (Seoul) and Tokyo time zones

The 0-hour gap between KST (Seoul) (South Korea) and Tokyo (Japan) requires some planning — but a 8-hour daily overlap means both teams can connect in real time without unusual scheduling.

💡 How to schedule across these time zones

✅

If you are in KST (Seoul), aim for 09:00–10:00, which corresponds to 09:00–10:00 in Tokyo — both teams are within working hours.

✅

If you are in KST (Seoul), aim for 10:00–11:00, which corresponds to 10:00–11:00 in Tokyo — both teams are within working hours.

✅

If you are in KST (Seoul), aim for 11:00–12:00, which corresponds to 11:00–12:00 in Tokyo — both teams are within working hours.

Avoid scheduling mistakes — especially around daylight saving changes. Use the ClockinSync Chrome Extension to instantly verify and compare both time zones directly in your browser, without manual calculations.

Add to your browser — Free →

Need a specific time? Use the slider or type directly into the input bar — it understands "3pm", "15:30", and location-specific formats like "9am KST (Seoul)".

KST (Seoul) ↔ TOKYO (Tokyo)

8h of business hours overlap daily (09:00–17:00)

KST (Seoul)

TOKYO (Tokyo)

00:00

01:00

02:00

03:00

04:00

05:00

06:00

07:00

08:00

09:00Working

10:00Working

11:00Working

12:00Working

13:00Working

14:00Working

15:00Working

16:00Working

17:00

18:00

19:00

20:00

21:00

22:00

23:00

Working hours: 09:00–17:00 local. Green = both working. Purple = one side only.

Frequently Asked Questions

What is the difference between kst and tokyo?

Korea Standard Time (kst) is UTC+9 and TOKYO (Tokyo) (tokyo) is UTC+9. The difference between them is 0 hours.

Where is kst used?

Korea Standard Time (kst) is used in South Korea and surrounding regions. The IANA timezone identifier is Asia/Seoul.

Where is tokyo used?

TOKYO (Tokyo) (tokyo) is used in Japan and surrounding regions. The IANA timezone identifier is Asia/Tokyo.

How do I convert kst to tokyo?

Use the interactive converter above. Drag the time slider to any kst time and the tokyo equivalent updates instantly. You can also type a time like "3pm" or "15:00" in the input bar.

Popular KST conversions

KST → London KST → New York KST → Tokyo KST → Dubai KST → Sydney KST → Paris KST → Berlin KST → Singapore KST → Los Angeles KST → Toronto

Popular TOKYO conversions

London → TOKYO New York → TOKYO Dubai → TOKYO Sydney → TOKYO Paris → TOKYO Berlin → TOKYO Singapore → TOKYO Los Angeles → TOKYO Toronto → TOKYO Mumbai → TOKYO