GMT to IST Converter

Greenwich Mean Time → India Standard Time · GMT is 5 hours 30 minutes behind IST

GMT
—
IST
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GMT and IST are the same time

GMT to IST Conversion Table

GMTIST
12:00 AM12:00 AM
1:00 AM1:00 AM
2:00 AM2:00 AM
3:00 AM3:00 AM
4:00 AM4:00 AM
5:00 AM5:00 AM
6:00 AM6:00 AM
7:00 AM7:00 AM
8:00 AM8:00 AM
9:00 AM9:00 AM
10:00 AM10:00 AM
11:00 AM11:00 AM
12:00 PM12:00 PM
1:00 PM1:00 PM
2:00 PM2:00 PM
3:00 PM3:00 PM
4:00 PM4:00 PM
5:00 PM5:00 PM
6:00 PM6:00 PM
7:00 PM7:00 PM
8:00 PM8:00 PM
9:00 PM9:00 PM
10:00 PM10:00 PM
11:00 PM11:00 PM

Green rows = business hours overlap (9:00 AM – 6:00 PM GMT)

Major GMT Cities
  • London
  • Manchester
  • Edinburgh
  • Birmingham
  • Dublin
  • Cardiff
Major IST Cities
  • Mumbai
  • Delhi
  • Bangalore
  • Hyderabad
  • Chennai
  • Pune
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GMT vs IST — London to India

GMT (UTC+0) — UK winter time. London uses BST (UTC+1) from late March to late October.

IST (UTC+5:30) — India Standard Time, fixed year-round. The :30 offset means IST conversions always produce :00 or :30 minutes.

The London–India corridor is one of the world's most active IT outsourcing and financial routes. Best overlap: 9 AM–12 PM GMT = 2:30–5:30 PM IST. London mornings consistently catch Indian afternoons within working hours.

Frequently Asked Questions

How many hours is GMT behind IST?

GMT (UTC+0) is 5 hours 30 minutes behind IST (UTC+5:30). During UK summer (BST, UTC+1), the gap shrinks to 4 hours 30 minutes. India does not observe DST, so the offset only changes when the UK shifts clocks in late March and late October.

What is 9 AM GMT in IST?

9:00 AM GMT (London winter) is 2:30 PM IST. During UK BST (summer), 9:00 AM BST = 1:30 PM IST. The best GMT–IST overlap for business calls is 9:00 AM–12:00 PM GMT = 2:30–5:30 PM IST (winter) or 9:00 AM–12:00 PM BST = 1:30–4:30 PM IST (summer).

What is the best time to call India from London?

In winter (GMT): 9:00 AM–12:00 PM GMT = 2:30–5:30 PM IST. In summer (BST): 9:00 AM–1:00 PM BST = 1:30–5:30 PM IST. London mornings are the prime window — they catch Indian afternoons before the end of the IST business day.

Does the GMT to IST gap change in summer?

Yes, but only on the UK side. India does not observe DST. When the UK shifts to BST (UTC+1) in late March, the gap changes from 5.5 hours to 4.5 hours. When the UK reverts to GMT (UTC+0) in late October, the gap returns to 5.5 hours. India is always ahead by either 4:30 or 5:30.