Seoul and Japan are in the same timezone. Midday in Seoul lines up with 12:00 in Japan.
Seoul is in the Asia/Seoul timezone. Japan is in Asia/Tokyo. The difference is 0 hours.
Business hours comparison
There is a 8-hour window each day where both Seoul and Japan are within standard business hours (09:00–17:00).
00:0006:0012:0018:0024:00
Seoul
Japan
Overlap (8h)
When to schedule across time zones
Both Seoul and Japan are in standard hours simultaneously for 8h per day. 3 recommended slots shown 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
Based on standard 09:00–17:00 working hours in each location's local time.
Upcoming public holidays
⚡ Watch out — upcoming holidays on both sides. Verify availability in advance.
Seoul7 holidays
Aug 15Liberation Day
Sep 24Chuseok
Sep 25Chuseok
Sep 26Chuseok
Oct 3National Foundation Day
Japan7 holidays
Jul 20Marine DaySOON
Aug 11Mountain Day
Sep 21Respect for the Aged Day
Sep 23Autumnal Equinox Day
Oct 12Sports Day
How to work with Seoul and Japan time zones
Working across Seoul (South Korea) and Japan (Japan) 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.
💡 How to schedule across these time zones
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09:00–10:00 in Seoul = 09:00–10:00 in Japan. Both sides are in standard business hours during this window.
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10:00–11:00 in Seoul = 10:00–11:00 in Japan. Both sides are in standard business hours during this window.
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11:00–12:00 in Seoul = 11:00–12:00 in Japan. 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.
Use the time slider above to find the exact equivalent time for any moment in Seoul. The input bar accepts natural language like "3pm", "15:30", or "9am Rome" for instant conversions.
