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Global ClockTime zone converter & meeting planner
PAGES
SETTINGS
Clock
Working hours
Start
09
End
18
Theme

AUTO follows the operating system. Working hours drive the green banding on every grid. All four persist on this device only.

GMT to JST

GMT is UTC+1 and JST is UTC+9 today — JST is 8 hours ahead of GMT. Abbreviations are for reading: this page resolves GMT to Europe/London and JST to Asia/Tokyo, which are the names that do not go ambiguous.

GMT: London in winter; British Summer Time in summer.

The working day, side by side

Hours shaded in both rows are inside working hours on both sides. Current abbreviations: BST and JST.

GMT and JST hour by hour, with the working-hour overlap shaded
City00:00 in GMT01:00 in GMT02:00 in GMT03:00 in GMT04:00 in GMT05:00 in GMT06:00 in GMT07:00 in GMT08:00 in GMT09:00 in GMT10:00 in GMT11:00 in GMT12:00 in GMT13:00 in GMT14:00 in GMT15:00 in GMT16:00 in GMT17:00 in GMT18:00 in GMT19:00 in GMT20:00 in GMT21:00 in GMT22:00 in GMT23:00 in GMT
GMT——000102030405060708091011121314151617181920212223
JST——000102030405060708091011121314151617181920212223
  • Working hours
  • Shoulder
  • Night
  • Overlap

Do more with GMT and JST

Open in the PlannerAdd more cities or zones, find a meeting time that works for everyone, then share it as a link.Open in Watch ViewKeep GMT, JST and other zones on screen as live clocks, under an animated sky and sun.

Common questions

What is GMT in JST?

JST is 8 hours ahead of GMT today: noon in GMT is 20:00 in JST.

Is GMT the same all year?

London in winter; British Summer Time in summer. An abbreviation describes an offset at a moment, not a place — the zone identifier Europe/London is the unambiguous name.

When can GMT and JST meet?

Working hours overlap for 1 hour a day: the shaded overlap is 17:00–18:00 in JST (09:00–10:00 your time).

GMT converted to other zones