GMT to JST Time Converter

Convert Greenwich Mean Time (GMT) to Japan Standard Time (JST). Both time zones are shown live below; current offset between them is 8 hours ahead.

London · Greenwich Mean Time
21:55:26
Sunday, May 10, 2026
GMT+1 · UTC+01:00
Tokyo · Japan Standard Time
05:55:26
Monday, May 11, 2026
GMT+9 · UTC+09:00

Convert a specific time

From: GMT (London)
To: JST (Tokyo)
--:--

Daylight Saving status right now

GMT (Greenwich Mean Time)
Observes DST
Yes
In DST right now
Yes
Next fall back
2026-10-25
Offset shift
UTC+01:00 → UTC+00:00
JST (Japan Standard Time)
Observes DST
No

Heads up: GMT observes DST while JST does not. The 8-hour difference shown above will shift by one hour when GMT starts or ends DST.

When can GMT and JST meet?

00
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
GMT
JST
Both zones in working hours (9am-5pm)
One zone working
Off-hours
Columns are hours of the day in London (GMT). Each row shows the local working-hours state in that zone for the same moment in time.
No overlap during strict 9-5 working hours; some flexibility needed.
If both sides are willing to extend to 8am-7pm, the available window is 08:00–10:00 GMT (16:00–18:00 JST).

Hour-by-hour GMT to JST conversion table

GMT time (London)JST time (Tokyo)Status
00:00 Sun08:00 SunOff-hours both sides
01:00 Sun09:00 SunJST working
02:00 Sun10:00 SunJST working
03:00 Sun11:00 SunJST working
04:00 Sun12:00 SunJST working
05:00 Sun13:00 SunJST working
06:00 Sun14:00 SunJST working
07:00 Sun15:00 SunJST working
08:00 Sun16:00 SunJST working
09:00 Sun17:00 SunGMT working
10:00 Sun18:00 SunGMT working
11:00 Sun19:00 SunGMT working
12:00 Sun20:00 SunGMT working
13:00 Sun21:00 SunGMT working
14:00 Sun22:00 SunGMT working
15:00 Sun23:00 SunGMT working
16:00 Sun00:00 MonGMT working
17:00 Sun01:00 MonOff-hours both sides
18:00 Sun02:00 MonOff-hours both sides
19:00 Sun03:00 MonOff-hours both sides
20:00 Sun04:00 MonOff-hours both sides
21:00 Sun05:00 MonOff-hours both sides
22:00 Sun06:00 MonOff-hours both sides
23:00 Sun07:00 MonOff-hours both sides

Times computed for today in each zone using the IANA time zone database. The conversion accounts for daylight saving time wherever applicable.

About these time zones

Greenwich Mean Time (GMT)
IANA identifier
Europe/London
Current UTC offset
UTC+01:00
Current abbreviation
GMT+1
Major cities in this zone
LondonManchesterEdinburghBirmingham
Japan Standard Time (JST)
IANA identifier
Asia/Tokyo
Current UTC offset
UTC+09:00
Current abbreviation
GMT+9
Major cities in this zone
TokyoOsakaKyotoYokohama

Sun today in London and Tokyo

London
Sunrise
05:18
Sunset
20:38
Solar noon
12:58
Daylight
15h 20m
Tokyo
Sunrise
04:41
Sunset
18:36
Solar noon
11:39
Daylight
13h 55m

Related converters

JST to GMT (reverse)GMT to ESTGMT to PSTGMT to UTCGMT to CETGMT to ISTEST to JSTPST to JSTUTC to JSTCET to JSTIST to JST
Looking for local time? See time in London or time in Tokyo.

Frequently asked questions

What is the time difference between GMT and JST right now?+
JST (Japan Standard Time) is currently 8 hours ahead GMT (Greenwich Mean Time). The exact difference can change when one or both zones transition into or out of daylight saving time.
Does GMT or JST observe daylight saving time?+
GMT: observes daylight saving time. JST: does not observe daylight saving time.
When is the best time to schedule a meeting between GMT and JST?+
Standard 9-5 hours do not overlap. Extending to 8am-7pm gives a window of 08:00–10:00 GMT (16:00–18:00 JST).
What time is it in Tokyo when it is 12:00 noon in London?+
When it is 12:00 Sun in London (GMT), it is 20:00 Sun in Tokyo (JST).
Which IANA time zone identifiers are used for GMT and JST?+
GMT maps to "Europe/London" in the IANA database. JST maps to "Asia/Tokyo". These identifiers are what most software libraries use to convert times accurately, including DST handling.
Is London ahead of or behind Tokyo?+
Whether London (GMT) is ahead of or behind Tokyo (JST) depends on the current UTC offsets. Right now JST is 8 hours ahead GMT. The live converter and side-by-side clocks above always reflect the current direction.
What are the current UTC offsets for GMT and JST?+
GMT is UTC+01:00 (GMT+1) and JST is UTC+09:00 (GMT+9). Both offsets shift by one hour when the corresponding region enters or exits daylight saving time, so the live values on this page are the source of truth.
Can I schedule meetings during business hours for both GMT and JST?+
Not during a strict 9am-5pm window. If both sides flex to 8am-7pm, the available meeting window between GMT and JST is 08:00–10:00 GMT.