Japan Standard Time
JST means UTC+09:00 throughout the year.
TIME ZONE CONVERTER
London to JST
Time Converter
Convert London, United Kingdom to Japan Standard Time. Compare dates, seasonal differences and meeting hours.
London is 8h or 9h behind JST in 2026, depending on the date.
9 AM London = 6 PM JST
Selected date: November 4, 2026. Fixed abbreviations retain their stated UTC offsets.
THE QUICK REFERENCE
CSVLondon to JST conversion table
November 4, 2026 · Date changes are marked.
View the full 24-hour table
| London | JST |
|---|---|
| 12:00 AM | 9:00 AM |
| 1:00 AM | 10:00 AM |
| 2:00 AM | 11:00 AM |
| 3:00 AM | 12:00 PM |
| 4:00 AM | 1:00 PM |
| 5:00 AM | 2:00 PM |
| 6:00 AM | 3:00 PM |
| 7:00 AM | 4:00 PM |
| 8:00 AM | 5:00 PM |
| 9:00 AM | 6:00 PM |
| 10:00 AM | 7:00 PM |
| 11:00 AM | 8:00 PM |
| London | JST |
|---|---|
| 12:00 PM | 9:00 PM |
| 1:00 PM | 10:00 PM |
| 2:00 PM | 11:00 PM |
| 3:00 PM | 12:00 AM +1 day |
| 4:00 PM | 1:00 AM +1 day |
| 5:00 PM | 2:00 AM +1 day |
| 6:00 PM | 3:00 AM +1 day |
| 7:00 PM | 4:00 AM +1 day |
| 8:00 PM | 5:00 AM +1 day |
| 9:00 PM | 6:00 AM +1 day |
| 10:00 PM | 7:00 AM +1 day |
| 11:00 PM | 8:00 AM +1 day |
Starting with the JST working day
These examples start on 2026-11-04 in JST.
09:00 JST00:00 →London · 2026-11-04
17:00 JST08:00 →London · 2026-11-04
Which time-zone meaning are we using?
ONE CLOCK TIME. THE WHOLE YEAR.
Year CSV09:00 London to JST throughout 2026
Keeping 09:00 on the London clock produces 2 different destination clock/date answers in 2026. The ranges below use London calendar dates, including transition days.
| Dates in London · 2026 | JST answer | Source → destination offsets | Explore |
|---|---|---|---|
| Jan 1 – Mar 2887 dates | 18:00Same date | UTC → UTC+09:00 | |
| Mar 29 – Oct 24210 dates | 17:00Same date | UTC+01:00 → UTC+09:00 | |
| Oct 25 – Dec 3168 dates | 18:00Same date | UTC → UTC+09:00 |
Every calendar date is included, not just workdays. Date ranges include both endpoints. Based on IANA 2026e; future rules may change.
DON’T LOSE A DAY
When does London time become a different date in JST?
Your complete source day: 2026-11-04. Each range shows which destination date to use.
London · 2026-11-0400:00–15:00UTC
JST · 2026-11-0409:00–24:00UTC+09:00 Same date
London · 2026-11-0415:00–24:00UTC
JST · 2026-11-0500:00–09:00UTC+09:00 Next day
Range starts are included; ends are excluded. 24:00 means midnight at the end of that date. Repeated hours appear separately with their UTC offsets. The strip is proportional to elapsed time.
THE BIGGER PICTURE
2026A year of time differences.
How JST compares with London throughout 2026.
JANFEBMARAPRMAYJUNJULAUGSEPOCTNOVDEC
+9h
+8h
+9h
London changes its UTC offset in 2026. JST is a fixed offset.
See exact change periods
| From (UTC, inclusive) | Until (UTC, exclusive) | JST vs London |
|---|---|---|
| 1 Jan 2026, 00:00 UTC | 29 Mar 2026, 01:00 UTC | 9h ahead |
| 29 Mar 2026, 01:00 UTC | 25 Oct 2026, 01:00 UTC | 8h ahead |
| 25 Oct 2026, 01:00 UTC | 1 Jan 2027, 00:00 UTC | 9h ahead |
CLOCK CHANGES
What changes at the next clock adjustment?
Exact periods outside the most common difference in 2026
The most frequent difference has JST 8h ahead relative to London. Exceptions:
| From (UTC, inclusive) | Until (UTC, exclusive) | Compared with London |
|---|---|---|
| 1 Jan 2026, 00:00 UTC | 29 Mar 2026, 01:00 UTC | 9h ahead |
| 25 Oct 2026, 01:00 UTC | 1 Jan 2027, 00:00 UTC | 9h ahead |
PLAN BEYOND A SINGLE DAY
Daily CSVLondon–JST working hours through 2026
Every date calculated with your working windows. 261 selected London workdays; public holidays are not applied.
Least shared time0h
Most common0h
Most shared time0h
Days without a 60-min slot261 / 261
One fixed start time does not fit every working day.
Your working windows never overlap on the selected host workdays this year. Adjust working days, hours or duration above, or use different seasonal meeting times.
London: 09:00–17:00, Mon, Tue, Wed, Thu, Fri. JST: 09:00–17:00, Mon, Tue, Wed, Thu, Fri.
Calculation details and repeated hours
Overnight shifts belong to their start weekday. Host workday means the source calendar date. Repeated local times use the first occurrence.
THE DETAILS THAT MATTER
London to JST: useful answers
Why is the London to JST difference sometimes 8 hours and sometimes 9 hours?
London is 8h or 9h behind JST in 2026, depending on the date. London changes its UTC offset in 2026. JST is a fixed offset.
Does the London–JST time difference change in 2026?
The published rules produce 3 periods with 2 different offsets in 2026. See the annual chart for the exact boundaries of each period.
Does this conversion change the calendar date?
09:00 in London on 2026-11-04 is 18:00 in JST on 2026-11-04. This selected time stays on the same date in both places. Other times can cross midnight.
Can London and JST meet during working hours?
Your selected working windows have no shared time on 2026-11-04. The planner shows alternatives and how many minutes fall outside each person's working hours. Try another date or adjust the windows.
Related time-zone meanings and conversions
Calculated with IANA 2026e. Working hours are your preferences; public holidays and calendar availability are not included. Our methodology