Kolkata zone
GMT+5:30 (GMT+5:30)
Singapore 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 Singapore both apply.
6 hours per day
- Kolkata
- GMT+5:30
- Singapore
- GMT+8
- Difference
- +2h 30m
- Business overlap
- 6h
Hour-by-hour conversion
Each row shows the matching local time in Singapore for an hour in Kolkata.
| Kolkata | Singapore | 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 Singapore time
Kolkata follows the Asia/Kolkata time zone (currently GMT+5:30, GMT+5:30), while Singapore follows Asia/Singapore (currently GMT+8, GMT+8). Singapore 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
Singapore to Kolkata
Open the converter
Plan a meeting between Kolkata and Singapore
More conversions from Kolkata
Frequently asked questions
- How many hours is Kolkata from Singapore?
- Singapore is 2h 30m ahead of Kolkata right now.
- What time is 9:00 AM Kolkata in Singapore?
- 9:00 AM in Kolkata is 11:30 AM in Singapore.
- What time is 5:00 PM Kolkata in Singapore?
- 5:00 PM in Kolkata is 7:30 PM in Singapore.
- When do Kolkata and Singapore 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 Singapore?
- Neither Kolkata nor Singapore observes daylight saving time, so the offset between them is constant year-round.
Local time page
Time in Kolkata
Local time page
Time in Singapore