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