GMT to IST converter

GMT to IST quick reference

GMT or BST? Daylight saving explained

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).

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

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

How the gap changes during the year

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

Working-day overlap, hour by hour

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

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

Example conversions

Questions people ask

What is the time difference between GMT and IST?

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

Does the GMT to IST 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 GMT to IST?

While London is on BST, 3 PM BST is 7:30 PM IST. While London is on GMT, 3 PM GMT is 8:30 PM IST. Or just type “3 PM GMT” in the converter at the top of this page.

When can the UK and India meet during work hours?

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

What time is 9 PM IST in GMT?

While London is on BST, 9 PM IST is 4:30 PM BST. While London is on GMT, 9 PM IST is 3:30 PM GMT. For other times, type something like “9 PM IST” 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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