Kolkata Time to GMT Converter
GMT is 5 hours 30 minutes behind IST. 9:00 AM IST = 3:30 AM GMT.
GMT is 5 hours 30 minutes behind IST. To convert Kolkata Time to GMT, subtract 5 hours 30 minutes from the Kolkata Time time: 9:00 AM IST = 3:30 AM GMT.
Kolkata Time (Kolkata time) is used in Kolkata, India. GMT (GMT) is used in Same offset as UTC. The UK and Ireland use GMT in winter; Iceland, Ghana and Senegal all year.
The UK is on GMT only in winter; in summer it uses BST (UTC+1).
Kolkata Time to GMT time conversion table
Kolkata Time to GMT on 7 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| Kolkata Time | GMT | Day |
|---|---|---|
| 12:00 AM IST | 6:30 PM GMT | previous day |
| 1:00 AM IST | 7:30 PM GMT | previous day |
| 2:00 AM IST | 8:30 PM GMT | previous day |
| 3:00 AM IST | 9:30 PM GMT | previous day |
| 4:00 AM IST | 10:30 PM GMT | previous day |
| 5:00 AM IST | 11:30 PM GMT | previous day |
| 6:00 AM IST | 12:30 AM GMT | night |
| 7:00 AM IST | 1:30 AM GMT | night |
| 8:00 AM IST | 2:30 AM GMT | night |
| 9:00 AM IST | 3:30 AM GMT | night |
| 10:00 AM IST | 4:30 AM GMT | night |
| 11:00 AM IST | 5:30 AM GMT | night |
| 12:00 PM IST | 6:30 AM GMT | — |
| 1:00 PM IST | 7:30 AM GMT | — |
| 2:00 PM IST | 8:30 AM GMT | — |
| 3:00 PM IST | 9:30 AM GMT | work hours |
| 4:00 PM IST | 10:30 AM GMT | work hours |
| 5:00 PM IST | 11:30 AM GMT | — |
| 6:00 PM IST | 12:30 PM GMT | — |
| 7:00 PM IST | 1:30 PM GMT | — |
| 8:00 PM IST | 2:30 PM GMT | — |
| 9:00 PM IST | 3:30 PM GMT | — |
| 10:00 PM IST | 4:30 PM GMT | — |
| 11:00 PM IST | 5:30 PM GMT | — |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert Kolkata Time to GMT
Subtract 5 hours 30 minutes from the Kolkata Time time to get GMT.
Example: 9:00 AM IST = 3:30 AM GMT.
Across midnight: 1:00 AM IST = 7:30 PM GMT (previous day). The date changes, so always check the day as well as the hour.
Time difference between Kolkata Time and GMT
The time difference between Kolkata Time and GMT is 5 hours 30 minutes all year – GMT is behind IST.
Kolkata Time and GMT during daylight saving time
- Kolkata Time does not observe daylight saving time; it stays on UTC+5:30 all year.
- GMT does not observe daylight saving time; it stays on UTC+0 all year.
Best time for a meeting between Kolkata Time and GMT
Kolkata Time and GMT share 2 hours 30 minutes of the 9 AM–5 PM working day. Any time between 2:30 PM and 5:00 PM IST lands between 9:00 AM and 11:30 AM GMT, inside working hours for both.
Kolkata Time to GMT FAQ
What is the time difference between Kolkata Time and GMT?
GMT is 5 hours 30 minutes behind IST all year. 9:00 AM IST = 3:30 AM GMT.
What is 9 AM Kolkata Time in GMT?
9:00 AM IST is 3:30 AM GMT.
What is 12 PM (noon) Kolkata Time in GMT?
12:00 PM IST is 6:30 AM GMT.
Is GMT ahead of or behind Kolkata Time?
GMT is 5 hours 30 minutes behind IST, so it is earlier in GMT than in Kolkata 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.
Does GMT change for daylight saving time?
No. GMT stays on the same offset all year, so conversions never shift for daylight saving time.
What is the best time for a meeting between Kolkata Time and GMT?
Kolkata Time and GMT share 2 hours 30 minutes of the 9 AM–5 PM working day. Any time between 2:30 PM and 5:00 PM IST lands between 9:00 AM and 11:30 AM GMT, inside working hours for both.
Related conversions
Convert GMT to Kolkata Time
Convert Kolkata Time to other time zones
Convert other time zones to GMT
Learn more
Updated 7 November 2026. Time zone data: IANA tz database.