Kolkata is 3 hours 30 minutes behind Hong Kong. At noon in Kolkata, your contact in Hong Kong sees 14:00.
Kolkata runs on Asia/Kolkata; Hong Kong runs on Asia/Hong_Kong. Together they are 2.5 hours 30 minutes apart.
Daily overlap window
Kolkata and Hong Kong share 5.5 hours of overlapping business hours daily — enough for real-time collaboration without anyone joining at odd hours.
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Kolkata
Hong Kong
Overlap (5.5h)
Best call times between these locations
There is a 5.5-hour daily window where both locations are in business hours. The 3 best slots are listed below.
09:00 Kolkata / 11:00 Hong Kong✓ Both working
10:00 Kolkata / 12:00 Hong Kong✓ Both working
11:00 Kolkata / 13:00 Hong Kong✓ Both working
Working hours defined as 09:00–17:00 local time for each location.
Public holidays for both locations
Kolkata
No upcoming public holidays this year.
Hong Kong6 holidays
Jul 1Hong Kong Special Administrative Region Establishment DaySOON
Sep 26Day following the Mid-Autumn Festival
Oct 1National Day
Oct 19Chung Yeung Festival
Dec 25Christmas Day
Scheduling between Kolkata and Hong Kong
Kolkata (India) and Hong Kong (Hong Kong) are 2.5 hours apart. With a 5.5-hour daily overlap in standard business hours, both teams can connect in real time without either side stretching beyond their normal workday.
💡 Scheduling tips for these locations
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If you are in Kolkata, aim for 09:00–10:00, which corresponds to 11:00–12:00 in Hong Kong — both teams are within working hours.
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If you are in Kolkata, aim for 10:00–11:00, which corresponds to 12:00–13:00 in Hong Kong — both teams are within working hours.
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If you are in Kolkata, aim for 11:00–12:00, which corresponds to 13:00–14:00 in Hong Kong — both teams are within working hours.
Avoid scheduling mistakes — especially around daylight saving changes. Use the ClockinSync Chrome Extension to instantly verify and compare both time zones directly in your browser, without manual calculations.
Need a specific time? Use the slider or type directly into the input bar — it understands "3pm", "15:30", and location-specific formats like "9am Kolkata".
