Chicago to San Mateo Time Difference
San Mateo is 1 hour ahead of Chicago
24-Hour Comparison
Business hours Extended Off hours
Chicago
09p
10p
11p
12a
01a
02a
03a
04a
05a
06a
07a
08a
09a
10a
11a
12p
01p
02p
03p
04p
05p
06p
07p
08p
San Mateo
10p
11p
12a
01a
02a
03a
04a
05a
06a
07a
08a
09a
10a
11a
12p
01p
02p
03p
04p
05p
06p
07p
08p
09p
Each column is the same moment in both cities, starting from right now and rolling forward 24 hours — daylight saving is already accounted for.
Best Time to Call
On a typical weekday (Monday–Friday).
- 09:00 AM – 04:00 PM in Chicago10:00 AM – 05:00 PM in San Mateo
Frequently Asked Questions
- What is the time difference between Chicago and San Mateo?
- San Mateo is 1 hour ahead of Chicago. Chicago is currently UTC-5 and San Mateo is UTC-4.
- Is San Mateo ahead of or behind Chicago?
- San Mateo is ahead of Chicago.
- What is the best time to call San Mateo from Chicago?
- On a typical weekday, the best time is 09:00 AM–04:00 PM in Chicago (10:00 AM–05:00 PM in San Mateo), when both cities are within business hours.
- Does the time difference between Chicago and San Mateo change during the year?
- Yes. Chicago and San Mateo don't switch to daylight saving time on the same schedule, so the offset shifts by up to an hour for part of the year.