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India and UK Time

Indian Standard Time and London side by side, with the seasonal shift shown.

India runs 5 hours 30 minutes ahead of the United Kingdom in winter, when London is on Greenwich Mean Time, and 4 hours 30 minutes ahead in summer, when London moves to British Summer Time. This is one of the easiest international pairs to work with, because the overlap covers most of both working days.

A generous overlap

A 9 a.m. London start is already 2:30 p.m. in India, so the two working days share several hours without anyone taking a call at an unreasonable hour. That overlap is a large part of why so much UK–India business coordination works smoothly. See IST to GMT and UTC for the arithmetic.

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Frequently asked questions

How far ahead of the UK is India?
5 hours 30 minutes during GMT in winter, and 4 hours 30 minutes during British Summer Time.
When does the difference change?
When the UK shifts, in late March and late October. India never changes, so every shift is on the UK side.