London TokyoGMT to JST Time Converter
London (GMT, UTC±0) is currently 9 hours behind Tokyo (JST, UTC+9). Compare live clocks, convert any hour, and find times to meet.
Quick answer
When it's in London, it's the same day in Tokyo.
London (GMT) runs 9 hours behind Tokyo (JST). 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
- GMT
- UTC±0
- JST
- UTC+9
- Best call window
- Outside 9–6
GMT to JST conversion table
The next 12 hours in GMT and the matching local time in JST. The current hour is highlighted; drag the converter's slider and the table follows.
| GMT | JST |
|---|---|
| NOW Mon, Jun 22 |
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 |
Tue, Jun 23 |
Tue, Jun 23 |
Best time to meet between GMT & JST
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 GMT and JST swings between 8 and 9 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 GMT
To JST
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 GMT time in JST?", 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": "GMT → JST",
"url": "https://worldclock.pro/en/convert/gmt-to-jst",
"from": {
"name": "GMT",
"type": "timezone",
"abbreviation": "GMT",
"daylightAbbreviation": "BST",
"iana": "Europe/London",
"standardUtcOffset": "+00:00",
"daylightUtcOffset": "+01:00",
"referenceCity": "London"
},
"to": {
"name": "JST",
"type": "timezone",
"abbreviation": "JST",
"daylightAbbreviation": null,
"iana": "Asia/Tokyo",
"standardUtcOffset": "+09:00",
"daylightUtcOffset": null,
"referenceCity": "Tokyo"
},
"currentDifferenceMinutes": 540,
"possibleDifferencesMinutes": [
480,
540
],
"note": "Between the regions that use these zones the difference is 8 and 9 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 GMT and JST?
GMT is currently 9 hours behind JST. GMT is on GMT (UTC±0) and JST is on JST (UTC+9). The difference can change when either side starts or ends daylight saving time.
Is JST ahead of or behind GMT?
JST is currently 9 hours ahead of GMT.
When it is 9:00 AM in GMT, what time is it in JST?
When it is 9:00 AM on a Monday in GMT, it is 6:00 PM in JST.
Do GMT and JST observe daylight saving time?
Regions on GMT switch to BST (UTC+1) during daylight saving time. JST does not observe daylight saving time.
How do I convert GMT time to JST time?
Add 9 hours to any time in GMT to get the time in JST. This page's converter and 24-hour table do it automatically and stay correct through daylight-saving changes.
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