IST to GMT/BST time converter
GMT/BST is 4 hours 30 minutes behind IST. When it is 9:00 AM in IST, it is 4:30 AM in GMT/BST.
12:35 AM in IST, Saturday, October 17, 2026
Shared working hours (9:00–18:00)
IST to GMT/BST conversion table
Every hour of today in IST and the matching time in GMT/BST. Light rows are typical working hours (9:00–18:00).
| IST | GMT/BST |
|---|---|
| 12:00 AM | 7:30 PM−1 day |
| 1:00 AM | 8:30 PM−1 day |
| 2:00 AM | 9:30 PM−1 day |
| 3:00 AM | 10:30 PM−1 day |
| 4:00 AM | 11:30 PM−1 day |
| 5:00 AM | 12:30 AM |
| 6:00 AM | 1:30 AM |
| 7:00 AM | 2:30 AM |
| 8:00 AM | 3:30 AM |
| 9:00 AM | 4:30 AM |
| 10:00 AM | 5:30 AM |
| 11:00 AM | 6:30 AM |
| 12:00 PM | 7:30 AM |
| 1:00 PM | 8:30 AM |
| 2:00 PM | 9:30 AM |
| 3:00 PM | 10:30 AM |
| 4:00 PM | 11:30 AM |
| 5:00 PM | 12:30 PM |
| 6:00 PM | 1:30 PM |
| 7:00 PM | 2:30 PM |
| 8:00 PM | 3:30 PM |
| 9:00 PM | 4:30 PM |
| 10:00 PM | 5:30 PM |
| 11:00 PM | 6:30 PM |
Best time to call or meet
Both sides are at work from 1:30 PM – 6:00 PM in IST (9:00 AM – 1:30 PM in GMT/BST).
Daylight saving time and the difference
The difference changes during the year because IST and GMT/BST switch clocks on different dates:
- Oct 17, 2026 – Oct 25, 2026: -4h 30m
- Oct 25, 2026 – Mar 28, 2027: -5h 30m
- Mar 28, 2027 – Oct 17, 2027: -4h 30m
More conversions
Questions and answers
What is the time difference between IST and GMT/BST?
GMT/BST is 4 hours 30 minutes behind IST.
What time is it in GMT/BST when it is 9 AM in IST?
When it is 9:00 AM in IST, it is 4:30 AM in GMT/BST.
When is the best time to call GMT/BST from IST?
Both sides are at work from 1:30 PM – 6:00 PM in IST (9:00 AM – 1:30 PM in GMT/BST).
Does the time difference between IST and GMT/BST change?
Yes, for part of the year, because daylight saving time starts and ends on different dates or applies on one side only.