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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 Rio de Janeiro vs Kolkata

Rio de Janeiro keeps UTC−3 (UTC−3) and Kolkata keeps IST (UTC+5:30) today. Kolkata is 8½ hours ahead of Rio de Janeiro; 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 Kolkata — the nearest workable window is 08:00–09:00 your time (17:00 there).

Rio de Janeiro and Kolkata hour by hour, with the working-hour overlap shaded
City00:00 in Rio de Janeiro01:00 in Rio de Janeiro02:00 in Rio de Janeiro03:00 in Rio de Janeiro04:00 in Rio de Janeiro05:00 in Rio de Janeiro06:00 in Rio de Janeiro07:00 in Rio de Janeiro08:00 in Rio de Janeiro09:00 in Rio de Janeiro10:00 in Rio de Janeiro11:00 in Rio de Janeiro12:00 in Rio de Janeiro13:00 in Rio de Janeiro14:00 in Rio de Janeiro15:00 in Rio de Janeiro16:00 in Rio de Janeiro17:00 in Rio de Janeiro18:00 in Rio de Janeiro19:00 in Rio de Janeiro20:00 in Rio de Janeiro21:00 in Rio de Janeiro22:00 in Rio de Janeiro23:00 in Rio de Janeiro
Rio de Janeiro——000102030405060708091011121314151617181920212223
Kolkata——000102030405060708091011121314151617181920212223
  • Working hours
  • Shoulder
  • Night
  • Overlap

Do more with Rio de Janeiro and Kolkata

Open in the PlannerAdd more cities, find a meeting time that works for everyone, then share it as a link.Open in Watch ViewKeep Rio de Janeiro, Kolkata 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 Kolkata — the nearest workable window is 08:00–09:00 your time (17:00 there).

Where daylight saving pulls them apart

Neither Rio de Janeiro nor Kolkata changes its clocks, so the gap above holds all year.

Also useful

Common questions

How many hours ahead is Kolkata of Rio de Janeiro?

Kolkata is 8½ hours ahead of Rio de Janeiro right now. The gap is not fixed: it moves whenever either side changes its clocks.

What is the best time to call between Rio de Janeiro and Kolkata?

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 Rio de Janeiro and Kolkata change clocks on the same date?

Neither city changes its clocks, so the gap between them never moves.