New York, NY to San Mateo, CA: time difference
San Mateo, CA is 3 h behind New York, NY. Live clocks for both, the working hours they share, and how each one sits against your own time.
Your time
One day, 2 clocks
Drag along the band to read any hour in every place at once.
New York, NY 15:38 3:38 PM San Mateo, CA 12:38 12:38 PM You –:–
15:38 3:38 PM
Eastern Daylight Time · UTC-4
☀️ 07:12 · 🌙 18:14
12:38 12:38 PM
Pacific Daylight Time · UTC-7
☀️ 07:21 · 🌙 18:29
·
−3 h
San Mateo, CA is 3 h behind New York, NY.
When you, New York, NY and San Mateo, CA are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇺🇸 New York, NY
0 12 AM 1 1 AM 2 2 AM 3 3 AM 4 4 AM 5 5 AM 6 6 AM 7 7 AM 8 8 AM 9 9 AM 10 10 AM 11 11 AM 12 12 PM 13 1 PM 14 2 PM 15 3 PM 16 4 PM 17 5 PM 18 6 PM 19 7 PM 20 8 PM 21 9 PM 22 10 PM 23 11 PM
🇺🇸 San Mateo, CA
21 9 PM 22 10 PM 23 11 PM 0 12 AM 1 1 AM 2 2 AM 3 3 AM 4 4 AM 5 5 AM 6 6 AM 7 7 AM 8 8 AM 9 9 AM 10 10 AM 11 11 AM 12 12 PM 13 1 PM 14 2 PM 15 3 PM 16 4 PM 17 5 PM 18 6 PM 19 7 PM 20 8 PM
📍 Your time
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇺🇸 New York, NY | 🇺🇸 San Mateo, CA |
|---|---|---|
| Local time | 15:38 | 12:38 |
| Local date | Sunday, October 18, 2026 | Sunday, October 18, 2026 |
| Time zone | Eastern Daylight Time | Pacific Daylight Time |
| UTC offset | UTC-4 | UTC-7 |
| Offset from New York, NY | — | −3 h |
| IANA zone | America/New York | America/Los Angeles |
| Daylight saving | On summer time → UTC-5, Nov 1, 01:00 | On summer time → UTC-8, Nov 1, 01:00 |
| Sunrise | 07:12 | 07:21 |
| Sunset | 18:14 | 18:29 |
| Daylight | 11 h 2 min | 11 h 8 min |
| People on this clock | 8,804,190 | 103,536 |
Compare New York, NY with another city
More comparisons with New York, NY: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
New York, NY and San Mateo, CA: common questions
What is the time difference between New York, NY, and San Mateo, CA?
San Mateo is 3 hours behind: it uses UTC−7, while New York is on UTC−4.
What time is it in San Mateo, CA, when it is 9:00 AM in New York, NY?
When it is 9:00 AM in New York, it is 6:00 AM in San Mateo.
What time is it in San Mateo, CA, at the end of the working day in New York, NY?
The working day in New York ends at 6:00 PM; in San Mateo it is 3:00 PM at that moment.
When is a good time to call San Mateo, CA, from New York, NY?
Between 12:00 PM and 6:00 PM in New York – that is 9:00 AM to 3:00 PM in San Mateo – both places are within working hours (9:00 AM–6:00 PM).
Until what time in New York, NY, is it still yesterday in San Mateo, CA?
Before 3:00 AM in New York, the date in San Mateo has not changed yet. From 9:00 PM in San Mateo, it is already the next day in New York.
Does the time gap between New York, NY, and San Mateo, CA, change during the year?
No – both places switch to and from summer time on the same dates, so the gap stays 3 hours.
