How to read it
Chicago 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: 11:00–12:00 in Chicago, which is 09:00–10:00 in San Francisco.
Through the year
How the gap between Chicago and San Francisco moves
San Francisco is 2h behind Chicago today. Both cities change their clocks on the same days, so the gap stays the same all year.
- San Francisco 2h behind Chicago
Hour by hour
Chicago 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.
- Chicago starts work 09:00 07:00 in San Francisco Early
- San Francisco starts work 09:00 11:00 in Chicago At desk
- Chicago finishes work 18:00 16:00 in San Francisco At desk
- San Francisco finishes work 18:00 20:00 in Chicago Late
Show all 24 hours
| Chicago | San Francisco |
|---|---|
| 00:00 Asleep | 22:00 Tue Asleep |
| 01:00 Asleep | 23:00 Tue Asleep |
| 02:00 Asleep | 00:00 Asleep |
| 03:00 Asleep | 01:00 Asleep |
| 04:00 Asleep | 02:00 Asleep |
| 05:00 Asleep | 03:00 Asleep |
| 06:00 Asleep | 04:00 Asleep |
| 07:00 Early | 05:00 Asleep |
| 08:00 Early | 06:00 Asleep |
| 09:00 At desk | 07:00 Early |
| 10:00 At desk | 08:00 Early |
| 11:00 At desk | 09:00 At desk |
| 12:00 At desk | 10:00 At desk |
| 13:00 At desk | 11:00 At desk |
| 14:00 At desk | 12:00 At desk |
| 15:00 At desk | 13:00 At desk |
| 16:00 At desk | 14:00 At desk |
| 17:00 At desk | 15:00 At desk |
| 18:00 Late | 16:00 At desk |
| 19:00 Late | 17:00 At desk |
| 20:00 Late | 18:00 Late |
| 21:00 Late | 19:00 Late |
| 22:00 Asleep | 20:00 Late |
| 23:00 Asleep | 21:00 Late |
Questions
Questions people ask
What is the time difference between Chicago and San Francisco?
San Francisco is 2h behind Chicago (as of Wed, 21 Oct 2026). Both cities change their clocks on the same days, so the gap stays the same all year.
What is the best time for a call between Chicago and San Francisco?
On a working day, the best time for a call is 11:00–12:00 in Chicago, which is 09:00–10:00 in San Francisco. Everyone is at their desk.
Does Chicago change its clocks?
Yes. Chicago moves its clocks back an hour on Sun, 1 Nov 2026, and forward an hour on Sun, 14 Mar 2027.
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
Chicago and…
- Chicago and Mumbai
- Chicago and Delhi
- Chicago and Bengaluru
- Chicago and Dubai
- Chicago and Abu Dhabi
- Chicago and Riyadh
- Chicago and Doha
- Chicago and Singapore
- Chicago and Hong Kong
- Chicago and Tokyo
- Chicago and Sydney
- Chicago and London
- Chicago and Paris
- Chicago and Berlin
- Chicago and Amsterdam
- Chicago and New York
- Chicago and Toronto
- Chicago 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 Hong Kong
- 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 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.