Time Difference

Kolkata vs Chattogram Time Difference

Compare the current local time in Kolkata, India and Chattogram, Bangladesh.

Live local timeDST awareUTC offsets

From

Kolkata

India

5:00 AM

Mon, Aug 17

UTC+5:30Asia/Kolkata

Difference

30 minutes

Swap

Chattogram

Bangladesh

5:30 AM

Mon, Aug 17

UTC+6Asia/Dhaka

Current difference

Chattogram is currently 30 minutes ahead of Kolkata.

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

24-hour comparison

Compare Kolkata and Chattogram hour by hour

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

24-hour day

Best working-hours overlap

9:00 AM – 6:00 PM in Kolkata

corresponds to 9:30 AM – 6:30 PM in Chattogram.

9 hours overlap

Kolkata

Asia/Kolkata

Chattogram

Asia/Dhaka

Availability

12:00 AM

Mon, Aug 17

12:30 AM

Mon, Aug 17

Night

1:00 AM

Mon, Aug 17

1:30 AM

Mon, Aug 17

Night

2:00 AM

Mon, Aug 17

2:30 AM

Mon, Aug 17

Night

3:00 AM

Mon, Aug 17

3:30 AM

Mon, Aug 17

Night

4:00 AM

Mon, Aug 17

4:30 AM

Mon, Aug 17

Night

5:00 AM

Mon, Aug 17

5:30 AM

Mon, Aug 17

Night

6:00 AM

Mon, Aug 17

6:30 AM

Mon, Aug 17

Night

7:00 AM

Mon, Aug 17

7:30 AM

Mon, Aug 17

Possible

8:00 AM

Mon, Aug 17

8:30 AM

Mon, Aug 17

Possible

9:00 AM

Mon, Aug 17

9:30 AM

Mon, Aug 17

Good overlap

10:00 AM

Mon, Aug 17

10:30 AM

Mon, Aug 17

Good overlap

11:00 AM

Mon, Aug 17

11:30 AM

Mon, Aug 17

Good overlap

12:00 PM

Mon, Aug 17

12:30 PM

Mon, Aug 17

Good overlap

1:00 PM

Mon, Aug 17

1:30 PM

Mon, Aug 17

Good overlap

2:00 PM

Mon, Aug 17

2:30 PM

Mon, Aug 17

Good overlap

3:00 PM

Mon, Aug 17

3:30 PM

Mon, Aug 17

Good overlap

4:00 PM

Mon, Aug 17

4:30 PM

Mon, Aug 17

Good overlap

5:00 PM

Mon, Aug 17

5:30 PM

Mon, Aug 17

Good overlap

6:00 PM

Mon, Aug 17

6:30 PM

Mon, Aug 17

Possible

7:00 PM

Mon, Aug 17

7:30 PM

Mon, Aug 17

Possible

8:00 PM

Mon, Aug 17

8:30 PM

Mon, Aug 17

Possible

9:00 PM

Mon, Aug 17

9:30 PM

Mon, Aug 17

Night

10:00 PM

Mon, Aug 17

10:30 PM

Mon, Aug 17

Night

11:00 PM

Mon, Aug 17

11:30 PM

Mon, Aug 17

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 Chattogram from Kolkata

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

Kolkata

9:00 AM – 6:00 PM

India

Best overlap

Chattogram

9:30 AM – 6:30 PM

Bangladesh

The best time to call Chattogram from Kolkata is between 9:00 AM and 6:00 PM in Kolkata. This corresponds to 9:30 AM – 6:30 PM in Chattogram.

Other reasonable windows

Kolkata

7:00 AM – 9:00 AM

Chattogram

7:30 AM – 9:30 AM

Kolkata

6:00 PM – 9:00 PM

Chattogram

6:30 PM – 9:30 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

Kolkata and Chattogram time difference explained

Current local-time relationship

Chattogram is currently 30 minutes ahead of Kolkata.

Kolkata uses Asia/Kolkata and currently has an offset of UTC+5:30. Chattogram uses Asia/Dhaka and currently has an offset of UTC+6.

Working-hours overlap

For a typical 9:00 AM–6:00 PM workday, the cities overlap from 9:00 AM to 5:30 PM in Kolkata, corresponding to 9:30 AM–6:00 PM in Chattogram.

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 Kolkata and Chattogram.

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Local clocks

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Current time in Kolkata Current time in Chattogram

FAQ

Kolkata to Chattogram time difference FAQ

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

What is the time difference between Kolkata and Chattogram?

The current time difference between Kolkata and Chattogram is 30 minutes. Chattogram is currently 30 minutes ahead of Kolkata.

Is Chattogram ahead of or behind Kolkata?

Chattogram is currently 30 minutes ahead of Kolkata.

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

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

What is the best time to call Chattogram from Kolkata?

Typical 9:00 AM–6:00 PM business hours overlap between 9:00 AM and 5:30 PM in Kolkata. This corresponds to 9:30 AM–6:00 PM in Chattogram.

Can the time difference between Kolkata and Chattogram change?

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