How to read it
Riyadh 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: 19:00–20:00 in Riyadh, which is 09:00–10:00 in San Francisco.
Through the year
How the gap between Riyadh and San Francisco moves
San Francisco is 10h behind Riyadh today. Daylight saving moves it:
- San Francisco 10h behind Riyadh
- San Francisco 11h behind Riyadh
- Sun, 1 Nov 2026 San Francisco's clocks go back an hour. San Francisco is then 11h behind Riyadh.
- Sun, 14 Mar 2027 San Francisco's clocks go forward an hour. San Francisco is then 10h behind Riyadh.
Hour by hour
Riyadh 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. Riyadh works Sun–Thu and San Francisco works Mon–Fri, so the shared working days are Mon–Thu.
- Riyadh starts work 09:00 23:00 Tue in San Francisco Asleep
- San Francisco starts work 09:00 19:00 in Riyadh Late
- Riyadh finishes work 18:00 08:00 in San Francisco Early
- San Francisco finishes work 18:00 04:00 Wed in Riyadh Asleep
Show all 24 hours
| Riyadh | San Francisco |
|---|---|
| 00:00 Asleep | 14:00 Tue At desk |
| 01:00 Asleep | 15:00 Tue At desk |
| 02:00 Asleep | 16:00 Tue At desk |
| 03:00 Asleep | 17:00 Tue At desk |
| 04:00 Asleep | 18:00 Tue Late |
| 05:00 Asleep | 19:00 Tue Late |
| 06:00 Asleep | 20:00 Tue Late |
| 07:00 Early | 21:00 Tue Late |
| 08:00 Early | 22:00 Tue Asleep |
| 09:00 At desk | 23:00 Tue Asleep |
| 10:00 At desk | 00:00 Asleep |
| 11:00 At desk | 01:00 Asleep |
| 12:00 At desk | 02:00 Asleep |
| 13:00 At desk | 03:00 Asleep |
| 14:00 At desk | 04:00 Asleep |
| 15:00 At desk | 05:00 Asleep |
| 16:00 At desk | 06:00 Asleep |
| 17:00 At desk | 07:00 Early |
| 18:00 Late | 08:00 Early |
| 19:00 Late | 09:00 At desk |
| 20:00 Late | 10:00 At desk |
| 21:00 Late | 11:00 At desk |
| 22:00 Asleep | 12:00 At desk |
| 23:00 Asleep | 13:00 At desk |
Questions
Questions people ask
What is the time difference between Riyadh and San Francisco?
San Francisco is 10h behind Riyadh (as of Wed, 21 Oct 2026). That changes on Sun, 1 Nov 2026, when San Francisco's clocks go back: then San Francisco is 11h behind Riyadh.
What is the best time for a call between Riyadh and San Francisco?
On a working day, the best time for a call is 19:00–20:00 in Riyadh (09:00–10:00 in San Francisco) until 31 Oct 2026 and from 14 Mar 2027, and 20:00–21:00 in Riyadh (09:00–10:00 in San Francisco) from 1 Nov 2026 to 13 Mar 2027. Riyadh works Sun–Thu and San Francisco works Mon–Fri, so the shared working days are Mon–Thu.
Does Riyadh change its clocks?
No. Riyadh stays on UTC+3 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
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San Francisco and…
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- San Francisco and Singapore
- San Francisco and Hong Kong
- San Francisco and Tokyo
- San Francisco and Sydney
- San Francisco and London
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- San Francisco and New York
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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.