Japan Standard Time (jst) is used in Japan. The IANA timezone identifier is Asia/Tokyo.

Coordinated Universal Time (utc) is used in United Kingdom. The IANA timezone identifier is UTC.

JST to UTC Time Converter

Japan Standard Time → Coordinated Universal Time

JST = UTC+9UTC = UTC+0

ClockinSync

BASE

09:00

Work Clients Team +

00:0006:0012:0018:0024:00

UTC (London)

United Kingdom · -8h

01:00

New York

USA · -13h

20:00-1 day

Dubai

United Arab Emirates · -5h

04:00

Sydney

Australia · +1h

10:00

Paris

France · -7h

02:00

JST (Tokyo) to UTC (London) — exact time difference

JST (Tokyo) is 9 hours ahead of UTC (London). When it's noon in JST (Tokyo), it's 03:00 in UTC (London).

JST (Tokyo) observes Asia/Tokyo and UTC (London) observes Europe/London — a 9 hours gap between them.

Working hours overlap

When JST (Tokyo) is in standard working hours, UTC (London) is not — and vice versa. There is no mutual business window between these two locations.

Meeting time recommendations

No business hours overlap exists between JST (Tokyo) and UTC (London). Showing the most balanced options with minimal inconvenience for both locations.

16:00 Tokyo / 07:00 London⚡ One side off-hours

⚠️ 2h before working hours in London

18:00 Tokyo / 09:00 London⚡ One side off-hours

⚠️ 2h after working hours in Tokyo

15:00 Tokyo / 06:00 London⚡ One side off-hours

⚠️ 3h before working hours in London

Assumes a standard 9 AM–5 PM workday in each location's local timezone.

Public holidays this year

JST (Tokyo)7 holidays

Jul 20Marine Day

Aug 11Mountain Day

Sep 21Respect for the Aged Day

Sep 23Autumnal Equinox Day

Oct 12Sports Day

UTC (London)

No upcoming public holidays this year.

JST (Tokyo) and UTC (London) — practical scheduling

Working across JST (Tokyo) (Japan) and UTC (London) (United Kingdom) is a challenge — the 9-hour difference means no shared business hours window under a standard schedule. Flexibility from at least one side is required.

💡 Practical scheduling guidelines

⚡

16:00–17:00 in JST (Tokyo) corresponds to 07:00–08:00 in UTC (London) (2h before working hours in London).

⚡

18:00–19:00 in JST (Tokyo) corresponds to 09:00–10:00 in UTC (London) (2h after working hours in Tokyo).

⚡

15:00–16:00 in JST (Tokyo) corresponds to 06:00–07:00 in UTC (London) (3h before working hours in London).

With no shared business hours, these slots distribute the scheduling burden as evenly as possible between both locations.

Recurring meetings are particularly vulnerable to DST shifts. The ClockinSync Chrome Extension alerts you before the offset changes.

Install ClockinSync Free →

Drag the slider at the top to convert any JST (Tokyo) time instantly. You can also type natural language like "3pm", "15:00", or a location name to get an immediate answer.

JST (Tokyo) ↔ UTC (London)

No overlap — one side will join outside working hours

JST (Tokyo)

UTC (London)