How to read it
Hong Kong and San Francisco, side by side
Each row is one city's day, half an hour to a square, lined up by the hours along the bottom.
- 1Filled: at the desk, 9:00 to 18:00 where that city is.
- 2Grey: up early, up late, or the weekend.
- 3Outline: asleep.
- 4Red band: your slot. Read straight down to see the same moment in every city.
- 5A marks the best time for everyone; B, when there is one, the next best.
The red band is the best time to call on Wed, 21 Oct 2026: 07:00–08:00 in Hong Kong, which is 16:00–17:00 in San Francisco.
Through the year
How the gap between Hong Kong and San Francisco moves
San Francisco is 15h behind Hong Kong today. Daylight saving moves it:
- San Francisco 15h behind Hong Kong
- San Francisco 16h behind Hong Kong
- Sun, 1 Nov 2026 San Francisco's clocks go back an hour. San Francisco is then 16h behind Hong Kong.
- Sun, 14 Mar 2027 San Francisco's clocks go forward an hour. San Francisco is then 15h behind Hong Kong.
Hour by hour
Hong Kong to San Francisco time, hour by hour
On a working day (Wed, 21 Oct 2026), with working hours of 9:00 to 18:00 in both cities.
- Hong Kong starts work 09:00 18:00 Tue in San Francisco Late
- San Francisco starts work 09:00 00:00 Wed in Hong Kong Asleep
- Hong Kong finishes work 18:00 03:00 in San Francisco Asleep
- San Francisco finishes work 18:00 09:00 Wed in Hong Kong At desk
Show all 24 hours
| Hong Kong | San Francisco |
|---|---|
| 00:00 Asleep | 09:00 Tue At desk |
| 01:00 Asleep | 10:00 Tue At desk |
| 02:00 Asleep | 11:00 Tue At desk |
| 03:00 Asleep | 12:00 Tue At desk |
| 04:00 Asleep | 13:00 Tue At desk |
| 05:00 Asleep | 14:00 Tue At desk |
| 06:00 Asleep | 15:00 Tue At desk |
| 07:00 Early | 16:00 Tue At desk |
| 08:00 Early | 17:00 Tue At desk |
| 09:00 At desk | 18:00 Tue Late |
| 10:00 At desk | 19:00 Tue Late |
| 11:00 At desk | 20:00 Tue Late |
| 12:00 At desk | 21:00 Tue Late |
| 13:00 At desk | 22:00 Tue Asleep |
| 14:00 At desk | 23:00 Tue Asleep |
| 15:00 At desk | 00:00 Asleep |
| 16:00 At desk | 01:00 Asleep |
| 17:00 At desk | 02:00 Asleep |
| 18:00 Late | 03:00 Asleep |
| 19:00 Late | 04:00 Asleep |
| 20:00 Late | 05:00 Asleep |
| 21:00 Late | 06:00 Asleep |
| 22:00 Asleep | 07:00 Early |
| 23:00 Asleep | 08:00 Early |
Questions
Questions people ask
What is the time difference between Hong Kong and San Francisco?
San Francisco is 15h behind Hong Kong (as of Wed, 21 Oct 2026). That changes on Sun, 1 Nov 2026, when San Francisco's clocks go back: then San Francisco is 16h behind Hong Kong.
What is the best time for a call between Hong Kong and San Francisco?
On a working day, the best time for a call is 07:00–08:00 in Hong Kong (16:00–17:00 in San Francisco) until 31 Oct 2026, and 09:00–10:00 in Hong Kong (17:00–18:00 in San Francisco) from 1 Nov 2026 to 13 Mar 2027, and 09:00–10:00 in Hong Kong (18:00–19:00 in San Francisco) from 14 Mar 2027.
Does Hong Kong change its clocks?
No. Hong Kong stays on UTC+8 all year.
Does San Francisco change its clocks?
Yes. San Francisco moves its clocks back an hour on Sun, 1 Nov 2026, and forward an hour on Sun, 14 Mar 2027.
More city pairs
Compare more cities
Hong Kong and…
- Hong Kong and Mumbai
- Hong Kong and Delhi
- Hong Kong and Bengaluru
- Hong Kong and Dubai
- Hong Kong and Abu Dhabi
- Hong Kong and Riyadh
- Hong Kong and Doha
- Hong Kong and Singapore
- Hong Kong and Tokyo
- Hong Kong and Sydney
- Hong Kong and London
- Hong Kong and Paris
- Hong Kong and Berlin
- Hong Kong and Amsterdam
- Hong Kong and New York
- Hong Kong and Toronto
- Hong Kong and Chicago
- Hong Kong and Los Angeles
San Francisco and…
- San Francisco and Mumbai
- San Francisco and Delhi
- San Francisco and Bengaluru
- San Francisco and Dubai
- San Francisco and Abu Dhabi
- San Francisco and Riyadh
- San Francisco and Doha
- San Francisco and Singapore
- San Francisco and Tokyo
- San Francisco and Sydney
- San Francisco and London
- San Francisco and Paris
- San Francisco and Berlin
- San Francisco and Amsterdam
- San Francisco and New York
- San Francisco and Toronto
- San Francisco and Chicago
- San Francisco and Los Angeles
From the team behind 10:10
Running an event across time zones?
C4E has spent twenty years running conferences, dealer meets and offsites in more than 40 countries, with clients, speakers and crews in different time zones. 10:10 is one of the tools we built for our own shows. It is free, with no account and nothing upsold.