Convert GMT to IST

Greenwich Mean Time (GMT) to India Standard Time (IST)

Strong business ties between the UK and India -- from legacy Commonwealth corporate relationships to modern tech outsourcing in Bangalore and Pune -- drive this search. The 5.5-hour gap to GMT is manageable and never changes. UK clocks use BST (UTC+1) in summer, so London is 4.5 hours behind India from late March to late October.

When it's 12:00 PM GMT, it's 5:30 PM in Mumbai

GMT UTC±0 IST UTC+5:30 +5:30h

Interactive Converter

Pick any time and date to convert between GMT and IST.

GMT to IST Conversion Table

Full 24-hour comparison. Business hours (9 AM -- 6 PM) are highlighted.

GMT (GMT)	Mumbai (IST)
12:00 AM	5:30 AM
1:00 AM	6:30 AM
2:00 AM	7:30 AM
3:00 AM	8:30 AM
4:00 AM	9:30 AM
5:00 AM	10:30 AM
6:00 AM	11:30 AM
7:00 AM	12:30 PM
8:00 AM	1:30 PM
9:00 AM	2:30 PM
10:00 AM	3:30 PM
11:00 AM	4:30 PM
12:00 PM	5:30 PM
1:00 PM	6:30 PM
2:00 PM	7:30 PM
3:00 PM	8:30 PM
4:00 PM	9:30 PM
5:00 PM	10:30 PM
6:00 PM	11:30 PM
7:00 PM	12:30 AM +1 day
8:00 PM	1:30 AM +1 day
9:00 PM	2:30 AM +1 day
10:00 PM	3:30 AM +1 day
11:00 PM	4:30 AM +1 day

Best Meeting Window

Top meeting times for teams in GMT and IST (9 AM -- 6 PM work hours, 1-hour meeting).

12a

12p

GMT

Mumbai

Overlap

Everyone available

Most available

Some overlap

Outside work hours

1 9:00 AM -- 10:00 AM GMT

GMT: 9:00 AM Mumbai: 2:00 PM

All members within working hours. Everyone in mid-day range.

8.3 / 10

2 11:00 AM -- 12:00 PM GMT

GMT: 11:00 AM Mumbai: 4:00 PM

All members within working hours. Everyone in mid-day range.

8.3 / 10

3 10:00 AM -- 11:00 AM GMT

GMT: 10:00 AM Mumbai: 3:00 PM

All members within working hours. Everyone in mid-day range.

8.2 / 10

Try the Meeting Planner with custom work hours →

Scheduling Tips

Schedule between 11:00 AM-2:00 PM GMT / 4:30-7:30 PM IST for the most productive overlap.
During BST (summer), you get an extra hour -- use 10:00 AM-2:00 PM BST / 2:30-6:30 PM IST.
Avoid late afternoon UK calls (after 3:00 PM GMT) as that pushes past 8:30 PM IST.
Friday afternoon syncs at 12:00 PM GMT / 5:30 PM IST work well as a weekly wrap-up before the Indian weekend starts.

Time Difference & DST

IST is 5 hours 30 minutes ahead of GMT all year.

Dates	GMT	Mumbai	Difference
Jan 1, 2026 – Dec 31, 2027	UTC±0	UTC+5:30	+5:30h

GMT, Mumbai do not use daylight saving time.

UK clocks use BST (UTC+1) from the last Sunday in March to the last Sunday in October.

Use the interactive converter for a specific date.

Major Cities

Greenwich Mean Time (GMT)

India Standard Time (IST)

Mumbai
Delhi
Bangalore

Frequently Asked Questions

What is the time difference between GMT and IST?

IST is 5 hours and 30 minutes ahead of GMT all year. When it is 12:00 PM GMT, it is 5:30 PM in India. UK clocks use BST (GMT+1) from late March to late October, so London is 4 hours and 30 minutes behind India in summer.

Does the GMT-IST offset change during the year?

No. GMT and IST both stay fixed, so the gap is 5.5 hours all year. London time does change: when the UK switches to BST (GMT+1) from late March to late October, London is 4.5 hours behind India, giving UK teams more overlap.

What time is 9 AM GMT in India?

9:00 AM GMT is 2:30 PM IST. During BST (summer), 9:00 AM BST is 1:30 PM IST. Both scenarios work well for a midday sync with Indian teams.

What is the best meeting time for London and India teams?

The sweet spot is 11:00 AM–1:00 PM GMT / 4:30–6:30 PM IST. UK teams are in core hours and Indian colleagues have not yet signed off. During BST, the overlap is even wider since 11:00 AM BST maps to 3:30 PM IST. Try the Meeting Planner for a ranked list of slots based on your team's actual work hours.