🕐 Mumbai to London Time Converter

London is 4 hours 30 minutes behind Mumbai for most of the year: when it is 11:00 am in Mumbai it is 6:30 am in London. In offset terms Mumbai is on UTC+05:30 and London is on UTC+00:00 in January, and UTC+05:30 and UTC+01:00 in July. The converter above works from your browser’s own time zone data, so the figure it shows is the one in force today rather than the one that was in force when this page was written.

The difference is not constant, because only one of the two cities observes daylight saving. In 2026, Mumbai does not change at all and London changes on 29 March and 25 October. That leaves 3 distinct periods in the year, and the table below gives the exact dates. It is the short windows that catch people out: a recurring call booked in one city’s clock silently moves in the other’s.

For arranging anything, the number that matters is the overlap. Mumbai works 10:00 to 18:30 and London works 09:00 to 17:30, which leaves 13:30 to 18:30 in Mumbai — 09:00 to 14:00 in London — as the window when both are open. That is 5 hours of shared working time. Both cities work Monday to Friday, so only the clock has to be reconciled.

Two local details worth knowing. India runs on a single half-hour zone, UTC+05:30, for the whole country and does not observe daylight saving. The City works 09:00 to 17:30, and the 08:00 market open means email is answered well before the official start.

The safest way to write a time for these two cities is to give both, as in "11:00 Mumbai / 06:30 London", or to give the UTC offset. Abbreviations are the trap: Mumbai is on IST for part of the year and IST for the rest, and the same three letters are reused in other parts of the world for entirely different offsets.

The formula

local Mumbai

The time you enter, on the Mumbai clock

offset

Each city’s UTC offset at that moment, read live from the IANA time zone database in your browser

−4.5

The difference in hours that holds for most of 2026: London is 4 hours 30 minutes behind Mumbai

day shift

Whether the converted time falls on the previous, same or next calendar day in London

How it works, step by step

1. Enter a time in Mumbai using the 24-hour hour box and the minute box — 15:30 is hour 15, minute 30.
2. Your browser reports the UTC offset in force in Mumbai and in London for that moment, so a date near a daylight saving transition is handled correctly rather than with a fixed 4.5 hour rule.
3. The second offset minus the first gives the difference, which is added to the time you entered. A result past midnight is marked as the next or previous day, because that is where most conversion mistakes live.
4. The panel also shows the current time in both cities, the date in London, and whether the two offices are open at the same moment.

Worked examples

How to read your score

Frequently asked questions

Mumbai to London: every hour, every period of 2026, and meeting slots

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