Does this converter handle daylight saving time?

Yes. The offset between Kolkata (India) and London can change across the year as either zone enters or leaves DST. Pick any date in the converter and the exact offset for that date is used.

🇮🇳 Kolkata (India) to London 🇬🇧 time converter

Convert any time from Kolkata (India) (IST) to London (GMT/BST), with daylight saving handled correctly for the date you choose.

London is currently 4.5 hours behind Kolkata (India).

Kolkata (India): Sat, Jun 20, 2026, 11:59 PM UTC+05:30 (GMT+5:30) · London: Sat, Jun 20, 2026, 7:29 PM UTC+01:00 (GMT+1)

Kolkata (India) 00h → 23hblue/green = 9am–6pm working hoursLondon local hour

Convert Kolkata (India) to London on any date

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Date & time (in “from” zone)

Get this conversion as JSON (developer API)

curl "https://tz.wrapper-agency.com/api/v1/tz?from=Asia%2FKolkata&to=Europe%2FLondon&time=2008-11-04T09%3A00"

Free timezone API — no key during beta. DST-correct, IANA tz database.

Current offsets

🇮🇳 Kolkata (India)	UTC+05:30
🇬🇧 London	UTC+01:00
Difference	−4.5h

FAQ

What time is it in London when it's noon in Kolkata (India)?: Use the converter above — enter 12:00 on your date in Kolkata (India) and you'll get the exact London local time, DST included.
Why does the time difference change during the year?: Kolkata (India) and London may observe daylight saving on different schedules (or not at all), so the gap between them shifts on clock-change dates.