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GMT to IST Converter

India is 5 h 30 min ahead of GMT, and 4 h 30 min ahead of UK summer time.

UK timeLondon

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GMT
—difference

India Standard TimeNew Delhi · Mumbai

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IST

IST is fixed at UTC+5:30. The UK uses GMT in winter and BST (UTC+1) in summer, so the gap changes twice a year. Strict GMT to IST is always 5:30.

Convert UK to IST

— India Standard Time

GMT to IST conversion table

Formula: IST = UK + 5:30 hours (GMT→IST) or + 4:30 hours (BST→IST). Strict GMT/UTC is always 1 hour behind the BST figure.

UKIST · GMT → ISTIST · BST → IST
12:00 AM5:30 AM4:30 AM
1:00 AM6:30 AM5:30 AM
2:00 AM7:30 AM6:30 AM
3:00 AM8:30 AM7:30 AM
4:00 AM9:30 AM8:30 AM
5:00 AM10:30 AM9:30 AM
6:00 AM11:30 AM10:30 AM
7:00 AM12:30 PM11:30 AM
8:00 AM1:30 PM12:30 PM
9:00 AM2:30 PM1:30 PM
10:00 AM3:30 PM2:30 PM
11:00 AM4:30 PM3:30 PM
12:00 PM5:30 PM4:30 PM
1:00 PM6:30 PM5:30 PM
2:00 PM7:30 PM6:30 PM
3:00 PM8:30 PM7:30 PM
4:00 PM9:30 PM8:30 PM
5:00 PM10:30 PM9:30 PM
6:00 PM11:30 PM10:30 PM
7:00 PM12:30 AM next day11:30 PM
8:00 PM1:30 AM next day12:30 AM next day
9:00 PM2:30 AM next day1:30 AM next day
10:00 PM3:30 AM next day2:30 AM next day
11:00 PM4:30 AM next day3:30 AM next day

Only the UK side changes (in 2026: Mar 29 and Oct 25), so the gap shifts by 1 hour twice a year. Strict GMT never changes.

Best meeting times

Working hours that overlap between London and New Delhi · Mumbai:

  • Winter (GMT / IST): 9-to-5 overlap: 9:00 AM–11:30 AM UK = 2:30 PM–5:00 PM IST.
  • Summer (BST / IST): 9-to-5 overlap: 9:00 AM–12:30 PM UK = 1:30 PM–5:00 PM IST.

Frequently asked questions

How many hours is India ahead of the UK?

5 hours 30 minutes in winter (GMT) and 4 hours 30 minutes in summer (BST), from the last Sunday in March to the last Sunday in October.

What is 9 AM GMT in IST?

9:00 AM GMT is 2:30 PM IST. If you mean 9 AM UK summer time (BST), it is 1:30 PM IST.

Is IST the same as GMT+5:30?

Yes. India Standard Time is UTC/GMT+5:30 all year.

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