Singapore zone
GMT+8 (GMT+8)
Kolkata zone
GMT+5:30 (GMT+5:30)
Difference
2h 30m behind Singapore
Business overlap
5h (9-5 windows)
Working hours overlap
Each cell is one hour in Singapore. Filled cells mark when 9 AM – 5 PM in Singapore and Kolkata both apply.
5 hours per day
- Singapore
- 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 Singapore.
| Singapore | 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 Singapore 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 Singapore time to Kolkata time
Singapore follows the Asia/Singapore time zone (currently GMT+8, GMT+8), while Kolkata follows Asia/Kolkata (currently GMT+5:30, GMT+5:30). Kolkata is 2h 30m behind Singapore right now.
Neither city observes daylight saving time, so the offset between them is the same all year.
Reverse this conversion
Kolkata to Singapore
Open the converter
Plan a meeting between Singapore and Kolkata
More conversions from Singapore
Frequently asked questions
- How many hours is Singapore from Kolkata?
- Kolkata is 2h 30m behind Singapore right now.
- What time is 9:00 AM Singapore in Kolkata?
- 9:00 AM in Singapore is 6:30 AM in Kolkata.
- What time is 5:00 PM Singapore in Kolkata?
- 5:00 PM in Singapore is 2:30 PM in Kolkata.
- When do Singapore 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 Singapore time.
- Does daylight saving time change the difference between Singapore and Kolkata?
- Neither Singapore nor Kolkata observes daylight saving time, so the offset between them is constant year-round.
Local time page
Time in Singapore
Local time page
Time in Kolkata