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Global ClockTime zone converter & meeting planner
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Working hours
Start
09
End
18
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AUTO follows the operating system. Working hours drive the green banding on every grid. All four persist on this device only.

Time in Shanghai vs San Mateo

Shanghai keeps CST (UTC+8) and San Mateo keeps PDT (UTC−7) today. San Mateo is 15 hours behind Shanghai; the rows below read both clocks live.

The working day, side by side

The working days do not meet. there is no working-hour overlap with San Mateo — the nearest workable window is 08:00–09:00 your time (17:00 there).

Shanghai and San Mateo hour by hour, with the working-hour overlap shaded
City00:00 in Shanghai01:00 in Shanghai02:00 in Shanghai03:00 in Shanghai04:00 in Shanghai05:00 in Shanghai06:00 in Shanghai07:00 in Shanghai08:00 in Shanghai09:00 in Shanghai10:00 in Shanghai11:00 in Shanghai12:00 in Shanghai13:00 in Shanghai14:00 in Shanghai15:00 in Shanghai16:00 in Shanghai17:00 in Shanghai18:00 in Shanghai19:00 in Shanghai20:00 in Shanghai21:00 in Shanghai22:00 in Shanghai23:00 in Shanghai
Shanghai——000102030405060708091011121314151617181920212223
San Mateo——000102030405060708091011121314151617181920212223
  • Working hours
  • Shoulder
  • Night
  • Overlap

Do more with Shanghai and San Mateo

Open in the PlannerAdd more cities, find a meeting time that works for everyone, then share it as a link.Open in Watch ViewKeep Shanghai, San Mateo and other cities on screen as live clocks, under an animated sky and sun.

Best hours to call

there is no working-hour overlap with San Mateo — the nearest workable window is 08:00–09:00 your time (17:00 there).

Where daylight saving pulls them apart

San Mateo next changes on Sunday 1 November 2026. Between those two dates the gap between the cities is an hour different from the one shown above — which is exactly when a recurring meeting drifts. Every date we track is on the daylight saving page.

Also useful

Common questions

How many hours ahead is San Mateo of Shanghai?

San Mateo is 15 hours behind Shanghai right now. The gap is not fixed: it moves whenever either side changes its clocks.

What is the best time to call between Shanghai and San Mateo?

There is no hour inside working hours in both cities. 08:00–09:00 your time (17:00 there) is the cheapest compromise, and one side is taking a shoulder hour.

Do Shanghai and San Mateo change clocks on the same date?

Only one of them does, so the gap between them changes twice a year even though neither city moved relative to the sun.