JST to GMT Time Converter
Use this JST to GMT time converter to compare Japan and United Kingdom time instantly. GMT is 9 hours behind JST, so 9:00 AM JST becomes 12:00 AM GMT and 5:00 PM JST becomes 8:00 AM GMT. The page is useful for business-hours overlap, international calls, remote-team handoffs, webinars, and travel planning, with daylight saving adjustments handled automatically.
JST to GMT Quick Facts
Use this JST to GMT converter to compare Japan and United Kingdom time, check the 9 hours gap, and confirm the right slot for calls, handoffs, and deadlines. Good overlap starts around 6:00 PM JST / 9:00 AM GMT.
How to Convert JST to GMT
Converting between Japan Standard Time and Greenwich Mean 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 Japan Standard Time (UTC +9) that you want to convert. Hit "Now" to load the current JST time instantly, or use "+1h" to step forward and compare.
The equivalent Greenwich Mean Time (UTC +0) time appears immediately. Since GMT is 9 hours behind of JST, most daytime conversions stay on the same calendar day.
Click "Copy Time" to grab the GMT result for your calendar or message. Use "+1d" to check how the conversion shifts across dates — helpful for scheduling recurring Japan–Universal calls.
Why Choose Our JST to GMT Converter
When someone in Japan suggests 6:00 PM JST, that's 9:00 AM GMT. This converter shows the overlap so both sides agree on one slot — no back-and-forth.
Late-night JST times can land on a different date in GMT 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 JST–GMT 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 JST. Convert the event time to GMT so you know exactly when to tune in — with a 9 hours difference, a morning event in Japan hits the evening in Universal.
JST to GMT Time Conversion Chart
Quick-reference conversion table covering every hour of the day at a glance.
Japan Standard Time to Greenwich Mean Time full day schedule
| Japan Standard Time | Greenwich Mean Time |
|---|---|
| 12:00 AM |
3:00 PM
(previous day)
|
| 1:00 AM |
4:00 PM
(previous day)
|
| 2:00 AM |
5:00 PM
(previous day)
|
| 3:00 AM |
6:00 PM
(previous day)
|
| 4:00 AM |
7:00 PM
(previous day)
|
| 5:00 AM |
8:00 PM
(previous day)
|
| 6:00 AM |
9:00 PM
(previous day)
|
| 7:00 AM |
10:00 PM
(previous day)
|
| 8:00 AM |
11:00 PM
(previous day)
|
| 9:00 AM |
12:00 AM
|
| 10:00 AM |
1:00 AM
|
| 11:00 AM |
2:00 AM
|
| 12:00 PM |
3:00 AM
|
| 1:00 PM |
4:00 AM
|
| 2:00 PM |
5:00 AM
|
| 3:00 PM |
6:00 AM
|
| 4:00 PM |
7:00 AM
|
| 5:00 PM |
8:00 AM
|
| 6:00 PM |
9:00 AM
|
| 7:00 PM |
10:00 AM
|
| 8:00 PM |
11:00 AM
|
| 9:00 PM |
12:00 PM
|
| 10:00 PM |
1:00 PM
|
| 11:00 PM |
2:00 PM
|
JST to GMT Time Difference, Business Hours, and DST
JST to GMT 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 JST becomes 12:00 AM GMT and 2:00 PM JST becomes 5:00 AM GMT.
This matters when teams in Tokyo and London 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.
Timezone offsets and DST rules verified against the IANA Time Zone Database. Conversion math and business-hour overlap windows double-checked against real-world scheduling scenarios.
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JST to GMT FAQ
Quick answers about daylight saving time, date changes, business-hour overlap, and the most common scheduling questions between Japan Standard Time and Greenwich Mean Time.
What is the time difference between JST and GMT?
When can JST and GMT have business-hour overlap?
Does JST or GMT observe daylight saving time?
How do I quickly convert JST to GMT?
Why convert GMT to JST?
When can London and Tokyo both be at work?
Does Japan ever shift its time zone?
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Convert Other Time Zones to GMT
Find the time difference from any major zone into Greenwich Mean Time. Use these pages when scheduling with Universal from a different region.