Hong Kong zone
GMT+8 (GMT+8)
Kolkata zone
GMT+5:30 (GMT+5:30)
Difference
2h 30m behind Hong Kong
Business overlap
5h (9-5 windows)
Working hours overlap
Each cell is one hour in Hong Kong. Filled cells mark when 9 AM – 5 PM in Hong Kong and Kolkata both apply.
5 hours per day
- Hong Kong
- GMT+8
- Kolkata
- GMT+5:30
- Difference
- -2h 30m
- Business overlap
- 5h
Hour-by-hour conversion
Each row shows the matching local time in Kolkata for an hour in Hong Kong.
| Hong Kong | Kolkata | Day | Window |
|---|---|---|---|
| 12:00 AM | 9:30 PM | previous day | — |
| 1:00 AM | 10:30 PM | previous day | — |
| 2:00 AM | 11:30 PM | previous day | — |
| 3:00 AM | 12:30 AM | same day | — |
| 4:00 AM | 1:30 AM | same day | — |
| 5:00 AM | 2:30 AM | same day | — |
| 6:00 AM | 3:30 AM | same day | — |
| 7:00 AM | 4:30 AM | same day | — |
| 8:00 AM | 5:30 AM | same day | — |
| 9:00 AM | 6:30 AM | same day | — |
| 10:00 AM | 7:30 AM | same day | — |
| 11:00 AM | 8:30 AM | same day | — |
| 12:00 PM | 9:30 AM | same day | Both 9-5 |
| 1:00 PM | 10:30 AM | same day | Both 9-5 |
| 2:00 PM | 11:30 AM | same day | Both 9-5 |
| 3:00 PM | 12:30 PM | same day | Both 9-5 |
| 4:00 PM | 1:30 PM | same day | Both 9-5 |
| 5:00 PM | 2:30 PM | same day | — |
| 6:00 PM | 3:30 PM | same day | — |
| 7:00 PM | 4:30 PM | same day | — |
| 8:00 PM | 5:30 PM | same day | — |
| 9:00 PM | 6:30 PM | same day | — |
| 10:00 PM | 7:30 PM | same day | — |
| 11:00 PM | 8:30 PM | same day | — |
Best meeting windows
If both teams keep standard 9 AM – 5 PM hours, the overlap window is roughly 12:00 PM – 5:00 PM in Hong Kong time. That gives you 5 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 Hong Kong time to Kolkata time
Hong Kong follows the Asia/Hong_Kong time zone (currently GMT+8, GMT+8), while Kolkata follows Asia/Kolkata (currently GMT+5:30, GMT+5:30). Kolkata is 2h 30m behind Hong Kong right now.
Neither city observes daylight saving time, so the offset between them is the same all year.
Reverse this conversion
Kolkata to Hong Kong
Open the converter
Plan a meeting between Hong Kong and Kolkata
More conversions from Hong Kong
Frequently asked questions
- How many hours is Hong Kong from Kolkata?
- Kolkata is 2h 30m behind Hong Kong right now.
- What time is 9:00 AM Hong Kong in Kolkata?
- 9:00 AM in Hong Kong is 6:30 AM in Kolkata.
- What time is 5:00 PM Hong Kong in Kolkata?
- 5:00 PM in Hong Kong is 2:30 PM in Kolkata.
- When do Hong Kong and Kolkata business hours overlap?
- Standard 9 AM - 5 PM working hours overlap for about 5 hours, roughly from 12:00 PM to 5:00 PM in Hong Kong time.
- Does daylight saving time change the difference between Hong Kong and Kolkata?
- Neither Hong Kong nor Kolkata observes daylight saving time, so the offset between them is constant year-round.
Local time page
Time in Hong Kong
Local time page
Time in Kolkata