Book a 10:00 call in Nagoya. Your Seoul counterpart logs in at 10:00 KST. Schedule a Nagoya dinner at 19:30 and the Seoul team joins at 19:30. Both cities run on UTC+9, year-round, with no daylight saving interruptions. The gap is zero.
Why is there no Nagoya to Seoul time difference?
Nagoya uses Japan Standard Time (JST), IANA zone Asia/Tokyo. Seoul uses Korea Standard Time (KST), IANA zone Asia/Seoul. Both offsets are UTC+9.
The 135°E meridian that anchors JST cuts through western Japan. Korea adopted the same meridian during the colonial period and kept it afterward. The two zones are functionally identical.
Does the Nagoya to Seoul time difference change in summer?
No. Japan abolished daylight saving in 1952. South Korea last ran a DST trial in 1987-1988 and has not changed clocks since. Neither city springs forward or falls back in 2026 or 2027.
Skip the seasonal math. Unlike a Nagoya, New York or Nagoya, London pair, this offset never shifts.
What hours line up for business between Nagoya and Seoul?
Open your Nagoya office at 09:00 JST. The Seoul office opens at 09:00 KST. Block meetings between 10:00 and 12:00, or 13:00 and 15:00, to avoid the 12:00-13:00 lunch peak on both sides.
Book travel without recalculating. A Shinkansen leaving Nagoya at 07:30 JST matches a KTX leaving Seoul at 07:30 KST. Trading on the Tokyo Stock Exchange (09:00-11:30 and 12:30-15:00 JST) aligns exactly with Korea Exchange hours.
Arrive at Chūbu Centrair International Airport (NGO) for a 09:00 departure. You land at Incheon International Airport (ICN) roughly two hours later with no jet lag. Departure boards at both airports show the same local time.
What to watch for when scheduling Nagoya, Seoul calls
Ignore the clock. Focus on the calendar. South Korea and Japan run different public holiday schedules. Japan's Golden Week clusters from late April to early May. Korea's Chuseok and Seollal fall on different dates. Before confirming a cross-border meeting during those windows, check the Japan Public Holidays 2026: Nagoya Calendar & Closures and verify the Korean holiday list separately.