Tokyo LondonJST to GMT Time Converter
Tokyo (JST, UTC+9) is currently 9 hours ahead of London (GMT, UTC±0). Compare live clocks, convert any hour, and find times to meet.
Quick answer
When it's in Tokyo, it's the same day in London.
Tokyo (JST) runs 9 hours ahead of London (GMT). A 9-to-5 workday on one side lands in the other side's evening or night, so the two cities share almost no normal working hours — edge-of-day calls are the trick.
- Time difference
- −9h 00m
- JST
- UTC+9
- GMT
- UTC±0
- Best call window
- Outside 9–6
JST to GMT conversion table
The next 12 hours in JST and the matching local time in GMT. The current hour is highlighted; drag the converter's slider and the table follows.
| JST | GMT |
|---|---|
| NOW Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Mon, Jun 22 |
Tue, Jun 23 |
Tue, Jun 23 |
Best time to meet between JST & GMT
Working hours are 9am–6pm in each city. The bright band is where they overlap — when both sides are at their desks.
Daylight saving shifts this gap by up to 1 hour
The difference between JST and GMT swings between 9 and 8 hours across the year as each side starts or ends daylight saving. Regions on GMT switch to BST (UTC+1) during daylight saving time. This page always shows the live, DST-aware difference.
Related time zone conversions
Jump straight to another pair — every combination is a live tool, not an article.
From JST
To GMT
One source of truth — for you and your AI
This page exposes the same answer as structured data, so when you ask an assistant "what's 9am JST time in GMT?", it can cite the exact, DST-aware result — not a stale blog post.
- Schema.org JSON-LD on every converter page
- A machine-readable facts island with IANA zones and every possible offset
- Live times in <time datetime> elements with explicit UTC offsets
{
"pair": "JST → GMT",
"url": "https://worldclock.pro/en/convert/jst-to-gmt",
"from": {
"name": "JST",
"type": "timezone",
"abbreviation": "JST",
"daylightAbbreviation": null,
"iana": "Asia/Tokyo",
"standardUtcOffset": "+09:00",
"daylightUtcOffset": null,
"referenceCity": "Tokyo"
},
"to": {
"name": "GMT",
"type": "timezone",
"abbreviation": "GMT",
"daylightAbbreviation": "BST",
"iana": "Europe/London",
"standardUtcOffset": "+00:00",
"daylightUtcOffset": "+01:00",
"referenceCity": "London"
},
"currentDifferenceMinutes": -540,
"possibleDifferencesMinutes": [
-540,
-480
],
"note": "Between the regions that use these zones the difference is 9 and 8 hours across the year, depending on daylight saving on each side. The clocks on this page show the named zones themselves, which are fixed."
}
Frequently asked questions
What is the time difference between JST and GMT?
JST is currently 9 hours ahead of GMT. JST is on JST (UTC+9) and GMT is on GMT (UTC±0). The difference can change when either side starts or ends daylight saving time.
Is GMT ahead of or behind JST?
GMT is currently 9 hours behind JST.
When it is 9:00 AM in JST, what time is it in GMT?
When it is 9:00 AM on a Monday in JST, it is 12:00 AM in GMT.
Do JST and GMT observe daylight saving time?
JST does not observe daylight saving time. Regions on GMT switch to BST (UTC+1) during daylight saving time.
How do I convert JST time to GMT time?
Subtract 9 hours from any time in JST to get the time in GMT. This page's converter and 24-hour table do it automatically and stay correct through daylight-saving changes.
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