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

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

TOKYO to KST Time Converter

TOKYO (Tokyo) → Korea Standard Time

TOKYO = UTC+9KST = UTC+9

ClockinSync

BASE

09:00

Work Clients Team +

00:0006:0012:0018:0024:00

KST (Seoul)

South Korea · 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: Tokyo and KST (Seoul)

Tokyo and KST (Seoul) are in the same timezone. When Tokyo clocks hit noon, KST (Seoul) reads 12:00.

Tokyo is in the Asia/Tokyo timezone. KST (Seoul) is in Asia/Seoul. The difference is 0 hours.

Business hours comparison

Every working day, Tokyo and KST (Seoul) are both in business hours for 8 hours simultaneously.

00:0006:0012:0018:0024:00

Tokyo

KST (Seoul)

Overlap (8h)

When to schedule across time zones

Both Tokyo and KST (Seoul) are in standard hours simultaneously for 8h per day. 3 recommended slots shown below.

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

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

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

Based on standard 09:00–17:00 working hours in each location's local time.

Holiday calendar for both locations

⚡ Both locations have upcoming holidays, check availability before scheduling.

Tokyo7 holidays

Jul 20Marine Day

Aug 11Mountain Day

Sep 21Respect for the Aged Day

Sep 23Autumnal Equinox Day

Oct 12Sports Day

KST (Seoul)7 holidays

Aug 15Liberation Day

Sep 24Chuseok

Sep 25Chuseok

Sep 26Chuseok

Oct 3National Foundation Day

Working across Tokyo and KST (Seoul)

Working across Tokyo (Japan) and KST (Seoul) (South Korea) involves a 0-hour gap. The good news: there is a 8-hour mutual window in standard business hours that lets both sides collaborate without anyone joining at an unreasonable hour.

💡 Best practice for cross-timezone meetings

✅

09:00–10:00 in Tokyo = 09:00–10:00 in KST (Seoul). Both sides are in standard business hours during this window.

✅

10:00–11:00 in Tokyo = 10:00–11:00 in KST (Seoul). Both sides are in standard business hours during this window.

✅

11:00–12:00 in Tokyo = 11:00–12:00 in KST (Seoul). Both sides are in standard business hours during this window.

DST transitions can silently shift your meeting times by an hour. The ClockinSync Chrome Extension tracks these changes automatically so you never get caught off guard.

Get the Extension — Free →

Use the time slider above to find the exact equivalent time for any moment in Tokyo. The input bar accepts natural language like "3pm", "15:30", or "9am Rome" for instant conversions.

TOKYO (Tokyo) ↔ KST (Seoul)

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

TOKYO (Tokyo)

KST (Seoul)

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 tokyo and kst?

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

Where is tokyo used?

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

Where is kst used?

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

How do I convert tokyo to kst?

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

Popular TOKYO conversions

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

Popular KST conversions

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