Time Difference

Hanoi vs Kolkata Time Difference

Compare the current local time in Hanoi, Vietnam and Kolkata, India.

Live local timeDST awareUTC offsets

From

Hanoi

Vietnam

6:15 PM

Sun, Nov 1

UTC+7Asia/Bangkok

Difference

1h 30m

Swap

Kolkata

India

4:45 PM

Sun, Nov 1

UTC+5:30Asia/Kolkata

Current difference

Kolkata is currently 1 hour 30 minutes behind Hanoi.

This difference is calculated using the current UTC offsets for both locations and automatically reflects daylight-saving changes.

24-hour comparison

Compare Hanoi and Kolkata hour by hour

See how a full local day in Hanoi, Vietnam maps to Kolkata, India. TimeInOne automatically accounts for timezone offsets, date changes and daylight-saving transitions.

24-hour day

Best working-hours overlap

11:00 AM – 6:00 PM in Hanoi

corresponds to 9:30 AM – 4:30 PM in Kolkata.

7 hours overlap

Hanoi

Asia/Bangkok

Kolkata

Asia/Kolkata

Availability

12:00 AM

Sun, Nov 1

10:30 PM

Previous day

Sat, Oct 31

Night

1:00 AM

Sun, Nov 1

11:30 PM

Previous day

Sat, Oct 31

Night

2:00 AM

Sun, Nov 1

12:30 AM

Sun, Nov 1

Night

3:00 AM

Sun, Nov 1

1:30 AM

Sun, Nov 1

Night

4:00 AM

Sun, Nov 1

2:30 AM

Sun, Nov 1

Night

5:00 AM

Sun, Nov 1

3:30 AM

Sun, Nov 1

Night

6:00 AM

Sun, Nov 1

4:30 AM

Sun, Nov 1

Night

7:00 AM

Sun, Nov 1

5:30 AM

Sun, Nov 1

Night

8:00 AM

Sun, Nov 1

6:30 AM

Sun, Nov 1

Night

9:00 AM

Sun, Nov 1

7:30 AM

Sun, Nov 1

Possible

10:00 AM

Sun, Nov 1

8:30 AM

Sun, Nov 1

Possible

11:00 AM

Sun, Nov 1

9:30 AM

Sun, Nov 1

Good overlap

12:00 PM

Sun, Nov 1

10:30 AM

Sun, Nov 1

Good overlap

1:00 PM

Sun, Nov 1

11:30 AM

Sun, Nov 1

Good overlap

2:00 PM

Sun, Nov 1

12:30 PM

Sun, Nov 1

Good overlap

3:00 PM

Sun, Nov 1

1:30 PM

Sun, Nov 1

Good overlap

4:00 PM

Sun, Nov 1

2:30 PM

Sun, Nov 1

Good overlap

5:00 PM

Sun, Nov 1

3:30 PM

Sun, Nov 1

Good overlap

6:00 PM

Sun, Nov 1

4:30 PM

Sun, Nov 1

Possible

7:00 PM

Sun, Nov 1

5:30 PM

Sun, Nov 1

Possible

8:00 PM

Sun, Nov 1

6:30 PM

Sun, Nov 1

Possible

9:00 PM

Sun, Nov 1

7:30 PM

Sun, Nov 1

Night

10:00 PM

Sun, Nov 1

8:30 PM

Sun, Nov 1

Night

11:00 PM

Sun, Nov 1

9:30 PM

Sun, Nov 1

Night

Working-hour labels use a general 9:00 AM–6:00 PM schedule. Individual schedules may differ.

On daylight-saving transition dates, a local day can contain 23 or 25 real hours instead of 24.

Call planning

Best time to call Kolkata from Hanoi

Compare typical business hours in Hanoi, Vietnam and Kolkata, India to find a practical time for calls, meetings or international coordination.

No direct business-hours overlap

Flexible scheduling is recommended

Typical 9:00 AM–6:00 PM working hours do not overlap directly between Hanoiand Kolkata. Consider an early-morning or evening call instead.

Other reasonable windows

Hanoi

6:15 PM – 9:15 PM

Kolkata

4:45 PM – 7:45 PM

Recommendations use typical 9:00 AM–6:00 PM business hours and a broader 7:00 AM–9:00 PM acceptable calling window. Individual schedules may differ.

Time difference explained

Hanoi and Kolkata time difference explained

Current local-time relationship

Kolkata is currently 1 hour and 30 minutes behind Hanoi.

Hanoi uses Asia/Bangkok and currently has an offset of UTC+7. Kolkata uses Asia/Kolkata and currently has an offset of UTC+5:30.

Working-hours overlap

For a typical 9:00 AM–6:00 PM workday, the cities overlap from 10:30 AM to 6:00 PM in Hanoi, corresponding to 9:00 AM–4:30 PM in Kolkata.

Because UTC offsets can change during the year, always check the selected date when planning an important international call or meeting.

Convert a specific time

Need more than the current difference?

Convert a specific date and local time between Hanoi and Kolkata.

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Local clocks

Explore each city

Current time in Hanoi Current time in Kolkata

FAQ

Hanoi to Kolkata time difference FAQ

Common questions about the current time difference, UTC offsets, daylight-saving changes and practical calling hours between Hanoi and Kolkata.

What is the time difference between Hanoi and Kolkata?

The current time difference between Hanoi and Kolkata is 1h 30m. Kolkata is currently 1 hour and 30 minutes behind Hanoi.

Is Kolkata ahead of or behind Hanoi?

Kolkata is currently 1 hour and 30 minutes behind Hanoi.

What time is it in Kolkata when it is 9:00 AM in Hanoi?

Using the current UTC offsets, 9:00 AM in Hanoi corresponds to 7:30 AM in Kolkata. The exact difference can change when daylight-saving rules change.

What is the best time to call Kolkata from Hanoi?

Typical 9:00 AM–6:00 PM business hours overlap between 10:30 AM and 6:00 PM in Hanoi. This corresponds to 9:00 AM–4:30 PM in Kolkata.

Can the time difference between Hanoi and Kolkata change?

Yes. The time difference can change if Hanoi or Kolkata changes its UTC offset because of daylight-saving or other local time-zone rules. TimeInOne uses the IANA zones Asia/Bangkok and Asia/Kolkata for date-aware calculations.