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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 Guantánamo vs Buenos Aires

Guantánamo keeps UTC−4 (UTC−4) and Buenos Aires keeps UTC−3 (UTC−3) today. Buenos Aires is 1 hour ahead of Guantánamo; 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: 10:00–18:00 in Buenos Aires (09:00–17:00 your time).

Guantánamo and Buenos Aires hour by hour, with the working-hour overlap shaded
City00:00 in Guantánamo01:00 in Guantánamo02:00 in Guantánamo03:00 in Guantánamo04:00 in Guantánamo05:00 in Guantánamo06:00 in Guantánamo07:00 in Guantánamo08:00 in Guantánamo09:00 in Guantánamo10:00 in Guantánamo11:00 in Guantánamo12:00 in Guantánamo13:00 in Guantánamo14:00 in Guantánamo15:00 in Guantánamo16:00 in Guantánamo17:00 in Guantánamo18:00 in Guantánamo19:00 in Guantánamo20:00 in Guantánamo21:00 in Guantánamo22:00 in Guantánamo23:00 in Guantánamo
Guantánamo——000102030405060708091011121314151617181920212223
Buenos Aires——000102030405060708091011121314151617181920212223
  • Working hours
  • Shoulder
  • Night
  • Overlap

Do more with Guantánamo 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 Guantánamo, Buenos Aires and other cities on screen as live clocks, under an animated sky and sun.

Best hours to call

09:00 in Guantánamo
Inside working hours on both sides
10:00 in Buenos Aires
10:00 in Guantánamo
Inside working hours on both sides
11:00 in Buenos Aires
11:00 in Guantánamo
Inside working hours on both sides
12:00 in Buenos Aires
12:00 in Guantánamo
Inside working hours on both sides
13:00 in Buenos Aires

Where daylight saving pulls them apart

Guantánamo 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 Guantánamo?

Buenos Aires is 1 hour ahead of Guantánamo right now. The gap is not fixed: it moves whenever either side changes its clocks.

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

Any hour in 09:00–17:00 Guantánamo time is inside working hours in both cities.

Do Guantánamo 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.