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Global ClockTime zone converter & meeting planner
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09
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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 San Mateo vs Buenos Aires

San Mateo keeps PDT (UTC−7) and Buenos Aires keeps UTC−3 (UTC−3) today. Buenos Aires is 4 hours ahead of San Mateo; the rows below read both clocks live.

The working day, side by side

Hours shaded in both rows are inside working hours in both cities: 13:00–18:00 in Buenos Aires (09:00–14:00 your time).

San Mateo and Buenos Aires hour by hour, with the working-hour overlap shaded
City00:00 in San Mateo01:00 in San Mateo02:00 in San Mateo03:00 in San Mateo04:00 in San Mateo05:00 in San Mateo06:00 in San Mateo07:00 in San Mateo08:00 in San Mateo09:00 in San Mateo10:00 in San Mateo11:00 in San Mateo12:00 in San Mateo13:00 in San Mateo14:00 in San Mateo15:00 in San Mateo16:00 in San Mateo17:00 in San Mateo18:00 in San Mateo19:00 in San Mateo20:00 in San Mateo21:00 in San Mateo22:00 in San Mateo23:00 in San Mateo
San Mateo——000102030405060708091011121314151617181920212223
Buenos Aires——000102030405060708091011121314151617181920212223
  • Working hours
  • Shoulder
  • Night
  • Overlap

Do more with San Mateo and Buenos Aires

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

Best hours to call

09:00 in San Mateo
Inside working hours on both sides
13:00 in Buenos Aires
10:00 in San Mateo
Inside working hours on both sides
14:00 in Buenos Aires
11:00 in San Mateo
Inside working hours on both sides
15:00 in Buenos Aires
12:00 in San Mateo
Inside working hours on both sides
16:00 in Buenos Aires

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 Buenos Aires of San Mateo?

Buenos Aires is 4 hours ahead of San Mateo right now. The gap is not fixed: it moves whenever either side changes its clocks.

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

Any hour in 09:00–14:00 San Mateo time is inside working hours in both cities.

Do San Mateo and Buenos Aires 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.