JST to GMT — Time Zone Converter
Japan Standard Time (JST, UTC+9) covers Japan; Greenwich Mean Time (GMT, UTC+0) covers the United Kingdom. In standard time, GMT is 9 hours behind JST. The practical window is early morning in the United Kingdom, 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 GMT, hour by hour (today)
Frequently asked questions
What is the time difference between JST and GMT?+
Japan Standard Time (JST) is UTC+9 and Greenwich Mean Time (GMT) is UTC+0, so in standard time GMT is 9 hours behind JST. The gap shifts by an hour around daylight saving transitions, so always check a live converter near the change dates in spring and autumn.
Does JST or GMT observe daylight saving time?+
Japan Standard Time stays on UTC+9 all year — no daylight saving time. Greenwich Mean Time observes daylight saving time (GMT in winter, BST in summer).
What is the best time for a meeting between JST and GMT?+
The practical window is early morning in the United Kingdom, 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 GMT 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 GMT times spelled out so nobody has to do the math.