Mumbai is currently 4.5 hours ahead of London. Convert time between Mumbai and London, see the exact difference, and find the best hours for calls and meetings.
Mumbai uses India Standard Time. London uses British Summer Time. Mumbai time is 4.5 hours ahead of London. So, when it is 12:00 AM in Mumbai, it is 7:30 PM in London.
Common Mumbai times and their London equivalents.
| Mumbai Time | London Time |
|---|---|
| 12:00 AM Mumbai | 7:30 PM London |
| 1:00 AM Mumbai | 8:30 PM London |
| 2:00 AM Mumbai | 9:30 PM London |
| 3:00 AM Mumbai | 10:30 PM London |
| 4:00 AM Mumbai | 11:30 PM London |
| 5:00 AM Mumbai | 12:30 AM London |
| 6:00 AM Mumbai | 1:30 AM London |
| 7:00 AM Mumbai | 2:30 AM London |
| 8:00 AM Mumbai | 3:30 AM London |
| 9:00 AM Mumbai | 4:30 AM London |
| 10:00 AM Mumbai | 5:30 AM London |
| 11:00 AM Mumbai | 6:30 AM London |
| 12:00 PM Mumbai | 7:30 AM London |
| 1:00 PM Mumbai | 8:30 AM London |
| 2:00 PM Mumbai | 9:30 AM London |
| 3:00 PM Mumbai | 10:30 AM London |
| 4:00 PM Mumbai | 11:30 AM London |
| 5:00 PM Mumbai | 12:30 PM London |
| 6:00 PM Mumbai | 1:30 PM London |
| 7:00 PM Mumbai | 2:30 PM London |
| 8:00 PM Mumbai | 3:30 PM London |
| 9:00 PM Mumbai | 4:30 PM London |
| 10:00 PM Mumbai | 5:30 PM London |
| 11:00 PM Mumbai | 6:30 PM London |
India uses India Standard Time (IST, UTC+5:30) year-round with no Daylight Saving Time. The unusual 30-minute offset from UTC reflects a compromise made during India's unification — the country spans two natural time zone widths but uses a single zone for national cohesion. IST applies to all Indian cities including Delhi, Mumbai, Bangalore, Chennai, Kolkata, and Hyderabad.
London uses Greenwich Mean Time (GMT, UTC+0) in winter and British Summer Time (BST, UTC+1) in summer. The UK clocks go forward one hour on the last Sunday of March and back on the last Sunday of October. GMT takes its name from the Royal Observatory in Greenwich, east London — the historical origin of UTC-based world time.
Both Mumbai and London may observe Daylight Saving Time, which means the offset between them can change twice a year. Here is what to expect each season.
| Period | Note | Mumbai | London | Offset |
|---|---|---|---|---|
| Nov – Mar | Both on standard time | GMT+5:30 (UTC+5:30) | GMT (UTC+0) | 5.5 hours |
| Mar – late Mar | US clocks forward, some zones still on standard | GMT+5:30 (UTC+5:30) | GMT (UTC+0) | 5.5 hours |
| Late Mar – Oct current | Both on summer / daylight time | GMT+5:30 (UTC+5:30) | GMT+1 (UTC+1) | 4.5 hours |
| Late Oct – early Nov | Clocks transitioning — check exact date | GMT+5:30 (UTC+5:30) | GMT (UTC+0) | 5.5 hours |
The transition window typically lasts 1–2 weeks in spring and autumn. If you have a recurring weekly meeting near a clock change, verify the exact date to avoid a missed call.
Mumbai is currently 4.5 hours ahead of London. Mumbai uses India Standard Time (UTC+5:30) and London uses British Summer Time (UTC+1).
The best overlap window is 1.5:00 pm–6:00 pm Mumbai time, which corresponds to 9:00 am–1.5:00 pm London time. Both cities are within standard business hours (9 am–6 pm) during this window.
When it is 9:00 AM in Mumbai, it is 4.5:00 am in London. Mumbai is 4.5 hours ahead of London.
When it is 5:00 PM in London, it is 9.5:00 pm in Mumbai.
London observes Daylight Saving Time but Mumbai does not. This means the offset between the two cities changes by one hour when London transitions its clocks. Always verify the current offset when scheduling meetings near DST transition dates.