IST to GMT Converter — India to UK Time

What This Tool Does

This tool converts a specific date and time from India Standard Time (IST, UTC+5:30) to UK time — London and the rest of the United Kingdom. It automatically handles the switch between Greenwich Mean Time (GMT) in winter and British Summer Time (BST) in the warmer months, so you don't have to work out which one applies to your date. Curious why IST itself never shifts for daylight saving the way the UK does? See our explainer on how time zones actually work.

How to Use It

Enter the IST date and time you want to convert (the tool is pre-set to convert IST → GMT/BST).
Press Convert.
The equivalent UK time appears instantly, including the day of week and date.

Example

A 6:00 PM IST call with a London office lands at 12:30 PM GMT during UK winter (late October to late March), or 1:30 PM BST the rest of the year when the UK is on British Summer Time — a full hour's difference depending on the date, which this tool accounts for automatically.

Frequently Asked Questions

What is the time difference between IST and GMT?

IST is 5 hours 30 minutes ahead of GMT (UK winter time). When the UK switches to British Summer Time (BST) from late March to late October, that gap narrows to 4 hours 30 minutes, since IST itself never changes for daylight saving.

Is GMT the same as UK time all year round?

No — GMT (Greenwich Mean Time) is only the UK's winter clock. From late March to late October the UK observes British Summer Time (BST), one hour ahead of GMT. This tool checks the actual date you enter and applies whichever one is in effect.

What's a good overlap window for IST/UK work calls?

Roughly 1:00–5:30 PM IST lines up with 8:30 AM–1:00 PM UK time (morning to early afternoon in London), a practical shared window given the 4.5-5.5 hour gap depending on the season.