GMT to JST — Time Zone Converter
Greenwich Mean Time (GMT, UTC+0) covers the United Kingdom; Japan Standard Time (JST, UTC+9) covers Japan. In standard time, JST is 9 hours ahead of GMT. 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.
GMT to JST, hour by hour (today)
Frequently asked questions
What is the time difference between GMT and JST?+
Greenwich Mean Time (GMT) is UTC+0 and Japan Standard Time (JST) is UTC+9, so in standard time JST is 9 hours ahead of GMT. 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 GMT or JST observe daylight saving time?+
Greenwich Mean Time observes daylight saving time (GMT in winter, BST in summer). Japan Standard Time stays on UTC+9 all year — no daylight saving time.
What is the best time for a meeting between GMT and JST?+
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 GMT 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 GMT and JST times spelled out so nobody has to do the math.