GMT to IST Converter | UK to India Time

GMT to IST Conversion Table — Standard Time

Offset: GMT +5.5 hours = IST. Applies during standard time. Work hours (9 AM–5 PM) highlighted.

GMT		IST
00:00		05:30
01:00		06:30
02:00		07:30
03:00		08:30
04:00		09:30
05:00		10:30
06:00		11:30
07:00		12:30
08:00		13:30
09:00		14:30
10:00		15:30
11:00		16:30
12:00		17:30
13:00		18:30
14:00		19:30
15:00		20:30
16:00		21:30
17:00		22:30
18:00		23:30
19:00		00:30 (+1 day)
20:00		01:30 (+1 day)
21:00		02:30 (+1 day)
22:00		03:30 (+1 day)
23:00		04:30 (+1 day)

BST to IST Conversion Table — Daylight Saving

Offset: BST +4.5 hours = IST. Applies when United Kingdom is observing daylight saving time.

BST		IST
00:00		04:30
01:00		05:30
02:00		06:30
03:00		07:30
04:00		08:30
05:00		09:30
06:00		10:30
07:00		11:30
08:00		12:30
09:00		13:30
10:00		14:30
11:00		15:30
12:00		16:30
13:00		17:30
14:00		18:30
15:00		19:30
16:00		20:30
17:00		21:30
18:00		22:30
19:00		23:30
20:00		00:30 (+1 day)
21:00		01:30 (+1 day)
22:00		02:30 (+1 day)
23:00		03:30 (+1 day)

The UK–India business corridor is one of the largest outsourcing relationships in the world. Banks in London, consultancies in Manchester, and tech firms across Britain work with millions of IT professionals in India. Accurate GMT–IST conversion is essential for standups, sprint reviews, and client calls.

India Standard Time is UTC+5:30 year-round. Greenwich Mean Time is UTC+0, shifting to BST (UTC+1) in summer. The standard gap is 5 hours 30 minutes: noon in London is 5:30 PM in India. During BST the gap narrows to 4 hours 30 minutes.

The overlap is generous compared to US–India pairs. A 9 AM–1 PM GMT block corresponds to 2:30–6:30 PM IST, giving teams a solid 4-hour window within normal business hours on both sides.

Daylight Saving Time: What Changes

United Kingdom observes daylight saving time, but India does not. This means the offset between GMT and IST changes seasonally: 5.5 hours during standard time and 4.5 hours during daylight saving. Double-check the current offset during transition weeks in March and November.

Frequently Asked Questions

What is the time difference between GMT and IST?

IST is 5 hours and 30 minutes ahead of GMT. During British Summer Time (BST, March–October), the gap shrinks to 4 hours and 30 minutes. India does not observe DST.

How does BST affect the GMT-to-IST conversion?

When the UK shifts to BST (UTC+1), the offset drops from 5.5 to 4.5 hours. India stays on IST (UTC+5:30) year-round. A noon meeting in London moves from 5:30 PM IST in winter to 4:30 PM IST in summer.

What is the best overlap window for UK and India teams?

The sweet spot is 9 AM–1 PM GMT (2:30–6:30 PM IST). This gives a full 4-hour overlap within standard working hours on both sides. During BST the IST side shifts an hour earlier, which is even more comfortable for Indian teams.

GMT to IST Converter | UK to India Time

GMT to IST Conversion Table — Standard Time

BST to IST Conversion Table — Daylight Saving

Daylight Saving Time: What Changes

Frequently Asked Questions

Learn More

Your calendar + time zones, at a glance.

GMT to IST Converter | UK to India Time

GMT to IST Conversion Table — Standard Time

BST to IST Conversion Table — Daylight Saving

Daylight Saving Time: What Changes

Frequently Asked Questions

Related Conversions

Learn More

Your calendar + time zones, at a glance.