IST to GMT converter

IST to GMT quick reference

GMT or BST? Daylight saving explained

IST is India Standard Time, UTC+5:30, used across all of India. India does not use daylight saving, so IST never changes.

GMT (UTC+0) is UK winter time; from late March to late October the UK is on BST (UTC+1). People who say “GMT” for a London meeting usually mean UK time, so this page uses London time. If you mean GMT as a fixed UTC+0 all year, it is the same as UTC (and that is how the type-a-time box reads the word “GMT”; type “London” for UK time).

Right now India is on IST, UTC+5:30 and London is on BST, UTC+1 (the clocks at the top of the page always show the live values).

How the gap changes during the year

London is 5.5 hours behind India while London is on GMT, and 4.5 hours behind India while London is on BST.

Working-day overlap, hour by hour

Each row is an hour in India. Green means that side is inside a 9–5 working day. While London is on GMT there is 2 h 30 m of shared 9–5 time; the easiest window is 12:30 PM–10 PM IST (7 AM–4:30 PM GMT). While London is on BST there is 3 h 30 m of shared 9–5 time; the easiest window is 11:30 AM–10 PM IST (7 AM–5:30 PM BST).

Shows India 5 AM to 10 PM. Times on the London side may fall on the next day.

Example conversions

Questions people ask

What is the time difference between IST and GMT?

London is 5 h 30 m behind India while London is on GMT, and 4 h 30 m behind India while London is on BST. Right now it is 4 h 30 m.

Does the IST to GMT difference change with daylight saving?

Yes. UK time (GMT/BST) changes its clocks and India Standard Time does not, so the gap moves by an hour twice a year (next on Sun 25 Oct 2026).

How do I convert 3 PM IST to GMT?

While London is on GMT, 3 PM IST is 9:30 AM GMT. While London is on BST, 3 PM IST is 10:30 AM BST. Or just type “3 PM IST” in the converter at the top of this page.

When can India and the UK meet during work hours?

While London is on GMT there is 2 h 30 m of shared 9–5 time; the most comfortable window is 12:30 PM–10 PM IST (7 AM–4:30 PM GMT). While London is on BST there is 3 h 30 m of shared 9–5 time; the most comfortable window is 11:30 AM–10 PM IST (7 AM–5:30 PM BST).

What time is 9 PM GMT in IST?

While London is on GMT, 9 PM GMT is 2:30 AM IST the next day. While London is on BST, 9 PM BST is 1:30 AM IST the next day. For other times, type something like “9 PM GMT” in the converter.

Should I write GMT or BST?

GMT (UTC+0) is UK winter time; from late March to late October the UK is on BST (UTC+1). People who say “GMT” for a London meeting usually mean UK time, so this page uses London time. If you mean GMT as a fixed UTC+0 all year, it is the same as UTC (and that is how the type-a-time box reads the word “GMT”; type “London” for UK time).

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