GMT to JST Time Converter
Use this GMT to JST time converter to compare United Kingdom and Japan time instantly. JST is 9 hours ahead of GMT, so 9:00 AM GMT becomes 6:00 PM JST and 5:00 PM GMT becomes 2:00 AM (next day) JST. The page is useful for business-hours overlap, international calls, remote-team handoffs, webinars, and travel planning, with daylight saving adjustments handled automatically.
GMT to JST Quick Facts
Use this GMT to JST converter to compare United Kingdom and Japan time, check the 9 hours gap, and confirm the right slot for calls, handoffs, and deadlines. Good overlap starts around 9:00 AM GMT / 6:00 PM JST.
How to Convert GMT to JST
Converting between Greenwich Mean Time and Japan Standard Time means accounting for a 9 hours gap — here's how to do it in under 10 seconds with no sign-up.
Pick the date and time in Greenwich Mean Time (UTC +0) that you want to convert. Hit "Now" to load the current GMT time instantly, or use "+1h" to step forward and compare.
The equivalent Japan Standard Time (UTC +9) time appears immediately. Since JST is 9 hours ahead of GMT, most daytime conversions stay on the same calendar day.
Click "Copy Time" to grab the JST result for your calendar or message. Use "+1d" to check how the conversion shifts across dates — helpful for scheduling recurring Universal–Japan calls.
Why Choose Our GMT to JST Converter
When someone in Universal suggests 9:00 AM GMT, that's 6:00 PM JST. This converter shows the overlap so both sides agree on one slot — no back-and-forth.
Late-night GMT times can land on a different date in JST because of the 9 hours offset. The converter labels "next day" or "previous day" next to the result so you never send a message a day early or miss a deadline.
Daylight Saving adjustments can widen or narrow the GMT–JST gap by an hour. During transition weeks many people get it wrong. This converter pulls the current UTC offsets automatically, so the result is right even on the changeover day.
Product launches, sports matches, and webinars are often announced in GMT. Convert the event time to JST so you know exactly when to tune in — with a 9 hours difference, a morning event in Universal falls during work hours in Japan.
GMT to JST Time Conversion Chart
Quick-reference conversion table covering every hour of the day at a glance.
Greenwich Mean Time to Japan Standard Time full day schedule
| Greenwich Mean Time | Japan Standard Time |
|---|---|
| 12:00 AM |
9:00 AM
|
| 1:00 AM |
10:00 AM
|
| 2:00 AM |
11:00 AM
|
| 3:00 AM |
12:00 PM
|
| 4:00 AM |
1:00 PM
|
| 5:00 AM |
2:00 PM
|
| 6:00 AM |
3:00 PM
|
| 7:00 AM |
4:00 PM
|
| 8:00 AM |
5:00 PM
|
| 9:00 AM |
6:00 PM
|
| 10:00 AM |
7:00 PM
|
| 11:00 AM |
8:00 PM
|
| 12:00 PM |
9:00 PM
|
| 1:00 PM |
10:00 PM
|
| 2:00 PM |
11:00 PM
|
| 3:00 PM |
12:00 AM
(next day)
|
| 4:00 PM |
1:00 AM
(next day)
|
| 5:00 PM |
2:00 AM
(next day)
|
| 6:00 PM |
3:00 AM
(next day)
|
| 7:00 PM |
4:00 AM
(next day)
|
| 8:00 PM |
5:00 AM
(next day)
|
| 9:00 PM |
6:00 AM
(next day)
|
| 10:00 PM |
7:00 AM
(next day)
|
| 11:00 PM |
8:00 AM
(next day)
|
GMT to JST Time Difference, Business Hours, and DST
GMT to JST is one of the more useful timezone conversions for calls, deadlines, and travel planning. The current gap is 9 hours, which means 9:00 AM GMT becomes 6:00 PM JST and 2:00 PM GMT becomes 11:00 PM JST.
This matters when teams in London and Tokyo need to align business hours, webinars, or customer-support coverage. Use the chart on this page when you want the exact conversion for today instead of relying on manual offset math.
Daylight saving changes can also shift the gap during the year, so a converter is safer than memorizing a fixed difference. That is especially important for recurring meetings and date-sensitive handoffs.
Popular GMT Time Converters
Explore more GMT conversions for major business and travel corridors. Each page includes a 24-hour chart, time difference summary, and meeting overlap guidance.
Convert Other Time Zones to JST
Find the time difference from any major zone into Japan Standard Time. Use these pages when scheduling with Japan from a different region.