JST to Kolkata Time Converter
IST is 3 hours 30 minutes behind JST. 9:00 AM JST = 5:30 AM IST.
IST is 3 hours 30 minutes behind JST. To convert JST to Kolkata Time, subtract 3 hours 30 minutes from the JST time: 9:00 AM JST = 5:30 AM IST.
JST (Japan Time) is used in Japan. Kolkata Time (Kolkata time) is used in Kolkata, India.
JST to Kolkata Time time conversion table
JST to Kolkata Time on 7 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| JST | Kolkata Time | Day |
|---|---|---|
| 12:00 AM JST | 8:30 PM IST | previous day |
| 1:00 AM JST | 9:30 PM IST | previous day |
| 2:00 AM JST | 10:30 PM IST | previous day |
| 3:00 AM JST | 11:30 PM IST | previous day |
| 4:00 AM JST | 12:30 AM IST | night |
| 5:00 AM JST | 1:30 AM IST | night |
| 6:00 AM JST | 2:30 AM IST | night |
| 7:00 AM JST | 3:30 AM IST | night |
| 8:00 AM JST | 4:30 AM IST | night |
| 9:00 AM JST | 5:30 AM IST | night |
| 10:00 AM JST | 6:30 AM IST | — |
| 11:00 AM JST | 7:30 AM IST | — |
| 12:00 PM JST | 8:30 AM IST | — |
| 1:00 PM JST | 9:30 AM IST | work hours |
| 2:00 PM JST | 10:30 AM IST | work hours |
| 3:00 PM JST | 11:30 AM IST | work hours |
| 4:00 PM JST | 12:30 PM IST | work hours |
| 5:00 PM JST | 1:30 PM IST | — |
| 6:00 PM JST | 2:30 PM IST | — |
| 7:00 PM JST | 3:30 PM IST | — |
| 8:00 PM JST | 4:30 PM IST | — |
| 9:00 PM JST | 5:30 PM IST | — |
| 10:00 PM JST | 6:30 PM IST | — |
| 11:00 PM JST | 7:30 PM IST | — |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert JST to Kolkata Time
Subtract 3 hours 30 minutes from the JST time to get Kolkata Time.
Example: 9:00 AM JST = 5:30 AM IST.
Across midnight: 1:00 AM JST = 9:30 PM IST (previous day). The date changes, so always check the day as well as the hour.
Time difference between JST and Kolkata Time
The time difference between JST and Kolkata Time is 3 hours 30 minutes all year – IST is behind JST.
JST and Kolkata Time during daylight saving time
- JST does not observe daylight saving time; it stays on UTC+9 all year.
- Kolkata Time does not observe daylight saving time; it stays on UTC+5:30 all year.
Best time for a meeting between JST and Kolkata Time
JST and Kolkata Time share 4 hours 30 minutes of the 9 AM–5 PM working day. Any time between 12:30 PM and 5:00 PM JST lands between 9:00 AM and 1:30 PM IST, inside working hours for both.
JST to Kolkata Time FAQ
What is the time difference between JST and Kolkata Time?
IST is 3 hours 30 minutes behind JST all year. 9:00 AM JST = 5:30 AM IST.
What is 9 AM JST in Kolkata Time?
9:00 AM JST is 5:30 AM IST.
What is 12 PM (noon) JST in Kolkata Time?
12:00 PM JST is 8:30 AM IST.
Is Kolkata Time ahead of or behind JST?
IST is 3 hours 30 minutes behind JST, so it is earlier in Kolkata Time than in JST.
Does JST change for daylight saving time?
No. JST stays on the same offset all year, so conversions never shift for daylight saving time.
Does Kolkata Time change for daylight saving time?
No. Kolkata Time stays on the same offset all year, so conversions never shift for daylight saving time.
What is the best time for a meeting between JST and Kolkata Time?
JST and Kolkata Time share 4 hours 30 minutes of the 9 AM–5 PM working day. Any time between 12:30 PM and 5:00 PM JST lands between 9:00 AM and 1:30 PM IST, inside working hours for both.
Related conversions
Convert Kolkata Time to JST
Convert JST to other time zones
Convert other time zones to Kolkata Time
Learn more
Updated 7 November 2026. Time zone data: IANA tz database.