JST to UTC — Time Zone Converter
Japan Standard Time (JST, UTC+9) covers Japan; Coordinated Universal Time (UTC, UTC+0) covers the global reference timeline. In standard time, UTC is 9 hours behind JST. The practical window is early morning in the global reference timeline, which lands in the late afternoon or evening in Japan. 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 UTC, hour by hour (today)
Frequently asked questions
What is the time difference between JST and UTC?+
Japan Standard Time (JST) is UTC+9 and Coordinated Universal Time (UTC) is UTC+0, so in standard time UTC is 9 hours behind JST. Neither zone observes daylight saving time, so this difference is the same all year.
Does JST or UTC observe daylight saving time?+
Japan Standard Time stays on UTC+9 all year — no daylight saving time. Coordinated Universal Time stays on UTC+0 all year — no daylight saving time.
What is the best time for a meeting between JST and UTC?+
The practical window is early morning in the global reference timeline, which lands in the late afternoon or evening in Japan. 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 UTC 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 UTC times spelled out so nobody has to do the math.