Time difference between London and Chennai

Updated live in your browser · IANA time zone database (Europe/London, Asia/Kolkata)

London BST · UTC+1

Chennai GMT+5:30 · UTC+5:30

Difference 4 hours and 30 minutes — Chennai is ahead of London

Best time to call

Hours shown in London time. The working-day overlap runs 9:00 AM – 1:00 PM in London, which is 1:30 PM – 5:30 PM in Chennai — schedule calls in that window.

Hour-by-hour conversion

Daylight saving time note

London and Chennai do not change their clocks on the same date. Between October 25, 2026 and March 28, 2027 the difference is 5 hours and 30 minutes behind Chennai — because London changes its clocks for daylight saving time while Chennai keeps the same time all year.

For the rest of the year the difference holds steady at 4 hours and 30 minutes. Every time on this page is computed from the IANA database at the moment you load it, so the tables above already account for whichever side has switched.

Why the time difference exists

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