KST to JST — Time Zone Converter
Korea Standard Time (KST, UTC+9) covers South Korea; Japan Standard Time (JST, UTC+9) covers Japan. In standard time, JST is on the same standard time as KST. With only a small offset, working hours in South Korea and Japan 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.
KST to JST, hour by hour (today)
Frequently asked questions
What is the time difference between KST and JST?+
Korea Standard Time (KST) is UTC+9 and Japan Standard Time (JST) is UTC+9, so in standard time JST is on the same standard time as KST. Neither zone observes daylight saving time, so this difference is the same all year.
Does KST or JST observe daylight saving time?+
Korea Standard Time stays on UTC+9 all year — no daylight saving time. Japan Standard Time stays on UTC+9 all year — no daylight saving time.
What is the best time for a meeting between KST and JST?+
With only a small offset, working hours in South Korea and Japan 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 KST to JST 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 KST and JST times spelled out so nobody has to do the math.