Kolkata zone
GMT+5:30 (GMT+5:30)
Hong Kong zone
GMT+8 (GMT+8)
Difference
2h 30m ahead of Kolkata
Business overlap
6h (9-5 windows)
Working hours overlap
Each cell is one hour in Kolkata. Filled cells mark when 9 AM – 5 PM in Kolkata and Hong Kong both apply.
6 hours per day
- Kolkata
- GMT+5:30
- Hong Kong
- GMT+8
- Difference
- +2h 30m
- Business overlap
- 6h
Hour-by-hour conversion
Each row shows the matching local time in Hong Kong for an hour in Kolkata.
| Kolkata | Hong Kong | Day | Window |
|---|---|---|---|
| 12:00 AM | 2:30 AM | same day | — |
| 1:00 AM | 3:30 AM | same day | — |
| 2:00 AM | 4:30 AM | same day | — |
| 3:00 AM | 5:30 AM | same day | — |
| 4:00 AM | 6:30 AM | same day | — |
| 5:00 AM | 7:30 AM | same day | — |
| 6:00 AM | 8:30 AM | same day | — |
| 7:00 AM | 9:30 AM | same day | — |
| 8:00 AM | 10:30 AM | same day | — |
| 9:00 AM | 11:30 AM | same day | Both 9-5 |
| 10:00 AM | 12:30 PM | same day | Both 9-5 |
| 11:00 AM | 1:30 PM | same day | Both 9-5 |
| 12:00 PM | 2:30 PM | same day | Both 9-5 |
| 1:00 PM | 3:30 PM | same day | Both 9-5 |
| 2:00 PM | 4:30 PM | same day | Both 9-5 |
| 3:00 PM | 5:30 PM | same day | — |
| 4:00 PM | 6:30 PM | same day | — |
| 5:00 PM | 7:30 PM | same day | — |
| 6:00 PM | 8:30 PM | same day | — |
| 7:00 PM | 9:30 PM | same day | — |
| 8:00 PM | 10:30 PM | same day | — |
| 9:00 PM | 11:30 PM | same day | — |
| 10:00 PM | 12:30 AM | next day | — |
| 11:00 PM | 1:30 AM | next day | — |
Best meeting windows
If both teams keep standard 9 AM – 5 PM hours, the overlap window is roughly 9:00 AM – 3:00 PM in Kolkata time. That gives you 6 hours per workday for live meetings.
Tighter overlap is achievable by having the side with later working hours start earlier, or by treating the first and last hours of each side as flexible. The bar above marks every hour where both cities sit inside a 9 AM – 5 PM window.
About converting Kolkata time to Hong Kong time
Kolkata follows the Asia/Kolkata time zone (currently GMT+5:30, GMT+5:30), while Hong Kong follows Asia/Hong_Kong (currently GMT+8, GMT+8). Hong Kong is 2h 30m ahead of Kolkata right now.
Neither city observes daylight saving time, so the offset between them is the same all year.
Reverse this conversion
Hong Kong to Kolkata
Open the converter
Plan a meeting between Kolkata and Hong Kong
More conversions from Kolkata
Frequently asked questions
- How many hours is Kolkata from Hong Kong?
- Hong Kong is 2h 30m ahead of Kolkata right now.
- What time is 9:00 AM Kolkata in Hong Kong?
- 9:00 AM in Kolkata is 11:30 AM in Hong Kong.
- What time is 5:00 PM Kolkata in Hong Kong?
- 5:00 PM in Kolkata is 7:30 PM in Hong Kong.
- When do Kolkata and Hong Kong business hours overlap?
- Standard 9 AM - 5 PM working hours overlap for about 6 hours, roughly from 9:00 AM to 3:00 PM in Kolkata time.
- Does daylight saving time change the difference between Kolkata and Hong Kong?
- Neither Kolkata nor Hong Kong observes daylight saving time, so the offset between them is constant year-round.
Local time page
Time in Kolkata
Local time page
Time in Hong Kong