United States
Time now in San Mateo County
Sunday, 23 August 2026
Sunrise 06:32Sunset 07:52Time zone UTC −7
Time zone
America/Los_Angeles
UTC offset
UTC −7
Daylight saving
In effect now
Population
718,451
Sunrise
06:32
Sunset
07:52
Day length
13h 20m
Coordinates
37.44, -122.36
Time difference from San Mateo County
Hours ahead (right) or behind (left) San Mateo County right now.
San Mateo County on the map
About the time in San Mateo County
Around 718,451 people live in San Mateo County, and all of them keep the same civil time, so the reading above applies to the whole urban area — not just the city centre.
San Mateo County runs on America/Los_Angeles, which puts the city UTC −7 from Coordinated Universal Time right now. The clock at the top of this page is not copied from your device: it is anchored to our reference timestamp and re-rendered every second against the IANA time zone database, so it stays right even when a laptop or phone has quietly drifted.
San Mateo County is on daylight saving time at the moment, which is why the offset reads UTC −7 instead of its winter value. Clocks go back on 1 November 2026, and anything scheduled across that date shifts by an hour.
Frequently asked questions about time in San Mateo County
- Does San Mateo County change its clocks for daylight saving?
- Yes, and it is in effect now. Clocks change again on 1 November 2026.
- What are normal business hours in San Mateo County in UTC?
- A 09:00–17:00 working day in San Mateo County runs from 16:00–00:00 UTC today.
- How far ahead or behind UTC is San Mateo County?
- San Mateo County is UTC −7 at this moment; the offset is read live, so it already accounts for daylight saving.
- What time is it in San Mateo County right now?
- The live clock above shows the current time in San Mateo County, updating every second from America/Los_Angeles (UTC −7).
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