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