Working-hour overlap
When both cities are at work
There is no full hour when both cities are inside a standard 09:00–17:00 working day. Use an early start in one city or an evening call in the other.
Time converter
Tokyo to San Francisco
Japan
Tokyo
20:5832
Wednesday, 29 July 2026GMT+9 · UTC+9
United States
San Francisco
4:5832
Wednesday, 29 July 2026GMT-7 · UTC−7
A good time to call
17:00GMT-7
Tuesday, 28 July 2026 in San Francisco
16 hours behind Tokyo
Working together
The useful part of the difference
A core technology and investment route across the Pacific.
Calendar boundary
Check the date, not just the hour
At 09:00 in Tokyo, San Francisco is still on the previous calendar day.
Daylight saving time
The gap can move during the year
Seasonal clock changes alter the gap: it is 17 hours behind on the January reference date and 16 hours behind on the July reference date. Transition weeks can differ again, so check the exact date.