JST to KST — Time Zone Converter
Japan Standard Time (JST, UTC+9) covers Japan; Korea Standard Time (KST, UTC+9) covers South Korea. In standard time, KST is on the same standard time as JST. With only a small offset, working hours in Japan and South Korea overlap for most of the day — scheduling is easy. Use the live converter below — it applies today's IANA time zone data, including daylight saving time, and gives you a meeting schedule you can paste straight into email or Slack.
JST to KST, hour by hour (today)
Frequently asked questions
What is the time difference between JST and KST?+
Japan Standard Time (JST) is UTC+9 and Korea Standard Time (KST) is UTC+9, so in standard time KST is on the same standard time as JST. Neither zone observes daylight saving time, so this difference is the same all year.
Does JST or KST observe daylight saving time?+
Japan Standard Time stays on UTC+9 all year — no daylight saving time. Korea Standard Time stays on UTC+9 all year — no daylight saving time.
What is the best time for a meeting between JST and KST?+
With only a small offset, working hours in Japan and South Korea overlap for most of the day — scheduling is easy. The converter above highlights office hours in green for both zones, so you can slide to a time that works for everyone.
How do I share a JST to KST meeting time by email?+
Pick a time in the converter, log it to the Smart Clipboard, and copy it as bullets, a formatted table, or a one-line question — with both JST and KST times spelled out so nobody has to do the math.