# IST to UK time time converter

> Convert India time (IST) to London time on any date, daylight saving handled: 5h 30m or 4h 30m apart by season. Office-hours table.

URL: https://tools.cuelark.com/ist-to-gmt
Publisher: Cuelark Team (https://cuelark.com)
Updated: 2026-11-10
Price: free, no sign-up
Privacy: runs in the browser; files are not uploaded

Convert a time in India to London time, or back, on any date. The difference is 5 hours 30 minutes when London is on GMT and 4 hours 30 minutes during BST; the converter picks the right one for the date you enter.

## How to use it

1. Pick the date and the time in India (or press swap to go the other way).
2. Read the UK time time, with the date if it changes.
3. Use the hour table to find times inside office hours in both places (green).

## Details

- **India:** IST, UTC+5:30 all year; India has no daylight saving
- **London:** GMT (UTC+0) in winter, BST (UTC+1) in summer
- **Clock changes:** British Summer Time runs from the last Sunday in March to the last Sunday in October: 29 March to 25 October 2026, 28 March to 31 October 2027
- **Overlap:** UK mornings overlap Indian afternoons: 9:00 a.m. in London is 2:30 p.m. IST in winter and 1:30 p.m. IST in summer

## Questions

### What is the time difference between IST and UK time?

5 hours 30 minutes while London is on standard time (GMT (UTC+0)), and 4 hours 30 minutes during daylight time (BST (UTC+1)). India does not change its clocks, so the difference changes only when London does.

### Is GMT the same as UK time?

Only in winter. From late March to late October the UK is on BST, one hour ahead of GMT. The converter uses London time, so it is right all year.

### When do the clocks change?

British Summer Time runs from the last Sunday in March to the last Sunday in October: 29 March to 25 October 2026, 28 March to 31 October 2027. The converter shows the next change for both places.

### How is daylight saving worked out?

From the time-zone database built into your browser (the IANA tz database), the same data phones and calendars use, so future and past dates are correct too.

### Does it need an account or send anything?

No. It runs in this page with your device's clock. Nothing is stored on a server.

## Related tools

- [Time zone converter](https://tools.cuelark.com/time-zone-converter)
- [IST to EST time converter](https://tools.cuelark.com/ist-to-est)
- [IST to PST time converter](https://tools.cuelark.com/ist-to-pst)
- [Date calculator](https://tools.cuelark.com/date-calculator)