October 26: Britain’s return to Greenwich Mean Time on Sunday changes the time difference for Indian readers organising work calls, classes and travel with the UK. The official British calendar lists October 25 as the 2026 autumn clock-change date. On this first Monday after the change, India is five hours and 30 minutes ahead of London.
Key highlights
- UK clocks moved back one hour on October 25, 2026.
- London is now on GMT rather than British Summer Time.
- A 9am London meeting corresponds to 2:30pm in India.
- The next scheduled British spring change is March 28, 2027.
What changed on Sunday
GOV.UK says the autumn change takes place at 2am on the last Sunday of October, when clocks move back by one hour. For 2026, that date was October 25. The clock change ends British Summer Time and restores GMT.
The Royal Observatory Greenwich separately explains the same seasonal adjustment. Its guidance is useful for distinguishing the time convention from the weather: putting a clock back changes the displayed local hour, not the amount of sunlight generated by a day.
The India–London difference, calculated
India’s National Physical Laboratory identifies Indian Standard Time as UTC plus five hours and 30 minutes. London on GMT has a zero-hour UTC offset. Those two official reference points allow a straightforward conversion.
Our calculation: 09:00 GMT + 05:30 = 14:30 IST. During British Summer Time, London was one hour ahead of GMT, so India’s lead was four hours and 30 minutes. It is now one hour wider.
| London on GMT | India on IST |
|---|---|
| 8:00am | 1:30pm |
| 9:00am | 2:30pm |
| 12:00 noon | 5:30pm |
| 12:30pm | 6:00pm |
| 5:00pm | 10:30pm |
How to handle recurring meetings
The important detail in an invitation is the time zone attached to it. A meeting fixed at 9am London time will now appear an hour later in India than it did during British summer time. A meeting fixed at 2:30pm India time has a different implication: its London display changes instead.
Check a recurring invitation’s displayed time in both locations rather than manually adding an hour to every appointment. A calendar that already understands London’s seasonal rules may have made the conversion. Changing it again can introduce the very error you were trying to avoid.
A clear message gives the date, local time and named time zone. Writing only “9am” leaves unnecessary ambiguity for an international team. For an appointment close to midnight, also confirm the calendar date at each end.
Devices and travel plans
The Royal Observatory notes that internet-connected devices generally adjust automatically, while clocks without that capability may need manual resetting. Check the device’s selected location and automatic-time settings if the display looks wrong.
For travel, use the current departure or arrival information issued by the operator and its stated local time. A seasonal clock change does not, on its own, establish that a flight or train has been rescheduled. Do not replace an operator’s confirmed itinerary with a conversion from an old message.
What to watch
Britain’s published calendar gives March 28, 2027 as the next forward change. Until that transition, use the GMT-based conversion for London. This guide concerns Britain and India; other destinations have their own time-zone and seasonal rules.
File photo: Elizabeth Tower and its clock in London, May 20, 2023. Photo: Clodie.geoffroy / Wikimedia Commons, CC BY-SA 4.0. Cropped and resized; not a photograph of the current event. Photo source; CC BY-SA 4.0.
Sources
- GOV.UK: When do the clocks change?
- Royal Observatory Greenwich: When do the clocks go back?
- CSIR–NPL: Indian Standard Time and time-frequency metrology
The International Desk covers world and Asian affairs, diplomacy and conflict, with a focus on what they mean for India. Stories are checked against at least two credible sources before publication.
