What is the time difference between London and Mumbai?

Mumbai (IST, UTC+5:30) is 5 hours 30 minutes ahead of London in winter (GMT, UTC+0) and 4 hours 30 minutes ahead in summer (BST, UTC+1). India does not observe Daylight Saving Time, so the offset changes only when the UK shifts its clocks in spring and autumn.

Does Mumbai observe Daylight Saving Time?

No. India does not use Daylight Saving Time. Mumbai stays on IST (UTC+5:30) all year. Only London shifts its clocks, which is why the London-Mumbai gap alternates between 5.5 hours in winter and 4.5 hours in summer.

When does the offset change from 5:30 to 4:30?

The UK moves clocks forward on the last Sunday in March at 01:00 GMT, entering BST (UTC+1). At that point Mumbai goes from 5 hours 30 minutes ahead to 4 hours 30 minutes ahead. The gap returns to +5:30 on the last Sunday in October at 02:00 BST when the UK reverts to GMT.

What are the best meeting times for London and Mumbai?

In winter (GMT), a 08:00–12:30 London window corresponds to 13:30–18:00 in Mumbai — solid overlap. In summer (BST), a 09:00–13:30 London window corresponds to 13:30–18:00 Mumbai. Avoid scheduling after 18:00 Mumbai time as it falls outside standard business hours.

Is this tool accurate for scheduling?

Yes. It uses the IANA timezone database embedded in your browser — the same source used by operating systems and calendar apps worldwide. Accuracy depends on your device clock being synchronized via NTP, which most devices do automatically.

IST stands for India Standard Time. It is UTC+5:30, used across the entire country year-round. The 30-minute offset from a whole hour is unusual globally and means IST does not align with neighboring half-hour or whole-hour UTC zones.

Time Difference: London to Mumbai

See the current time in London and Mumbai side by side, with the live UTC offset (IST is UTC+5:30, no DST), updated every second.

London, United Kingdom

--:--:--

GMT UTC+0

Mumbai, India

--:--:--

IST UTC+5:30

Current Offset

+5:30 hours

Mumbai is 5 hours 30 minutes ahead of London

Meeting Overlap Finder

Business hours (09:00–18:00) highlighted — best overlap shaded

London	Mumbai	Status

Convert London Time to Mumbai Time

Based on the current offset — updates automatically

London	Mumbai

Summary

This tool displays the live current time in both London (Europe/London — GMT in winter, BST in summer) and Mumbai (Asia/Kolkata — IST, UTC+5:30 year-round, no DST) side by side. Mumbai never observes Daylight Saving Time, so the offset between the two cities changes twice a year: 5 hours 30 minutes ahead of London in winter (GMT) and 4 hours 30 minutes ahead in summer (BST). Use this tool to schedule calls with India, coordinate remote teams, or plan travel between the UK and Mumbai.

How it works

Your browser reads the current moment from your device clock.
It converts that moment to Europe/London time using the IANA timezone database built into modern browsers.
The same moment is converted to Asia/Kolkata time (IST, UTC+5:30).
The UTC offsets of both cities are compared to calculate the exact hour and minute difference.
All three values — London time, Mumbai time, and the offset — refresh every second.
When London switches between GMT and BST, the displayed offset adjusts automatically.

Use cases

Scheduling video calls between London and Mumbai offices.
Checking if a colleague in Mumbai is still at their desk.
Planning UK-India travel and arrival time comparisons.
Remote teams coordinating daily standups across the UK and India.
Finding overlapping business hours for London-Mumbai meetings.
Verifying whether London is currently on GMT or BST.
Investors monitoring London and Mumbai financial market hours.
Students and teachers arranging online lessons between the UK and India.

Frequently Asked Questions

Last updated: 2026-06-11 · Reviewed by Nham Vu