Yokohama vs London: Current Time Difference
On 15 January 2026, London is 9 hours behind Yokohama. On 15 July 2026, that gap shrinks to 8 hours.
The shift happens because Japan Standard Time stays locked at UTC+9 while London swings between GMT (UTC+0) and BST (UTC+1). Japan has no daylight saving time. The IANA zone for Yokohama is Asia/Tokyo, and the offset never moves.
Rule of thumb: London on GMT means Yokohama is 9 hours ahead. London on BST means Yokohama is 8 hours ahead.
JST vs GMT/BST: How the Gap Changes
Japan stays on JST year-round. No spring forward, no fall back.
London moves its clocks twice a year.
| Period | London time zone | Time difference (Yokohama, London) |
|---|---|---|
| Late October to late March | GMT (UTC+0) | 9 hours |
| Late March to late October | BST (UTC+1) | 8 hours |
A meeting set for 10:00 London time in January is 19:00 in Yokohama. The same meeting in July is 18:00 in Yokohama. That one-hour shift catches people who assume the gap is fixed.
Best Overlap Hours for Calls and Meetings
The overlap is workable year-round.
The best window is 8:00-10:00 London time, which is 16:00-18:00 JST. Two solid hours: late afternoon in Yokohama, start of the business day in London.
The reverse window is worse. 9:00 JST is midnight in London during winter and 1:00 in summer. Skip that slot.
If you are calling a landline in Yokohama, dial +81 045 followed by the local number. Mobile numbers start with 090, 080, or 070.
Travel Time and Jet Lag Tips
Flying from London to Yokohama means crossing 8 or 9 time zones eastward. You arrive in the evening and lose a day.
Get morning sunlight on arrival. Yokohama sunrise on 21 June 2026 is 04:26. On 21 December 2026 it is 06:46. Melatonin is prescription-only in Japan; check with a travel clinic before departure if you plan to use it.