London to IST to Chennai Time Converter
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Quick answers
Selected conversion
1:00 pm13:00 BST (UTC+1), Oct 18, 2026 = 5:30 pm17:30 IST (UTC+5:30), Oct 18, 2026 = 5:30 pm17:30 IST (UTC+5:30), Oct 18, 2026
London is 4 hours and 30 minutes behind IST. London is 4 hours and 30 minutes behind Chennai.
How the time difference changes
London to IST
For most of the year, London is 4 hours and 30 minutes behind IST. From Oct 25, 2026 to Mar 28, 2027, London is 5 hours and 30 minutes behind IST.
For most of the year, working hours of 9:00 am to 6:00 pm in London correspond to 1:30 pm to 10:30 pm in IST. At other times of the year, working hours of 9:00 am to 6:00 pm in London correspond to 2:30 pm to 11:30 pm in IST.For most of the year, working hours of 09:00 to 18:00 in London correspond to 13:30 to 22:30 in IST. At other times of the year, working hours of 09:00 to 18:00 in London correspond to 14:30 to 23:30 in IST.
London to Chennai
For most of the year, London is 4 hours and 30 minutes behind Chennai. From Oct 25, 2026 to Mar 28, 2027, London is 5 hours and 30 minutes behind Chennai.
For most of the year, working hours of 9:00 am to 6:00 pm in London correspond to 1:30 pm to 10:30 pm in Chennai. At other times of the year, working hours of 9:00 am to 6:00 pm in London correspond to 2:30 pm to 11:30 pm in Chennai.For most of the year, working hours of 09:00 to 18:00 in London correspond to 13:30 to 22:30 in Chennai. At other times of the year, working hours of 09:00 to 18:00 in London correspond to 14:30 to 23:30 in Chennai.
Compare London time with IST and Chennai time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
BST (British Summer Time) is 4 hours and 30 minutes behind India Standard Time. BST (British Summer Time) is 4 hours and 30 minutes behind IST (India Standard Time).
1:00 pm13:00 in London, United Kingdom is 5:30 pm17:30 in IST and is 5:30 pm17:30 in Chennai, India
London to IST call time
Best time for a conference call or a meeting is between 9am-1:30pm09:00-13:30 in London which corresponds to 1:30pm-6pm13:30-18:00 in IST
London to Chennai call time
Best time for a conference call or a meeting is between 9am-1:30pm09:00-13:30 in London which corresponds to 1:30pm-6pm13:30-18:00 in Chennai
1:00 pm13:00 BST (British Summer Time) (London, United Kingdom). Offset UTC +1:00 hour
5:30 pm17:30 India Standard Time (IST). Offset UTC +5:30 hours
5:30 pm17:30 IST (India Standard Time) (Chennai, India). Offset UTC +5:30 hours
1:00 pm13:00 London, United Kingdom / 5:30 pm17:30 IST / 5:30 pm17:30 Chennai, India
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| London, United Kingdom | IST | Chennai, India |
|---|---|---|
| 4:30am | 4:30am | |
| 5:30am | 5:30am | |
| 6:30am | 6:30am | |
| 7:30am | 7:30am | |
| 8:30am | 8:30am | |
| 9:30am | 9:30am | |
| 10:30am | 10:30am | |
| 11:30am | 11:30am | |
| 12:30pm | 12:30pm | |
| 1:30pm | 1:30pm | |
| 2:30pm | 2:30pm | |
| 3:30pm | 3:30pm | |
| 4:30pm | 4:30pm | |
| 5:30pm | 5:30pm | |
| 6:30pm | 6:30pm | |
| 7:30pm | 7:30pm | |
| 8:30pm | 8:30pm | |
| 9:30pm | 9:30pm | |
| 10:30pm | 10:30pm | |
| 11:30pm | 11:30pm | |
| 12:30am next day | 12:30am next day | |
| 1:30am next day | 1:30am next day | |
| 2:30am next day | 2:30am next day | |
| 3:30am next day | 3:30am next day | |
| 04:30 | 04:30 | |
| 05:30 | 05:30 | |
| 06:30 | 06:30 | |
| 07:30 | 07:30 | |
| 08:30 | 08:30 | |
| 09:30 | 09:30 | |
| 10:30 | 10:30 | |
| 11:30 | 11:30 | |
| 12:30 | 12:30 | |
| 13:30 | 13:30 | |
| 14:30 | 14:30 | |
| 15:30 | 15:30 | |
| 16:30 | 16:30 | |
| 17:30 | 17:30 | |
| 18:30 | 18:30 | |
| 19:30 | 19:30 | |
| 20:30 | 20:30 | |
| 21:30 | 21:30 | |
| 22:30 | 22:30 | |
| 23:30 | 23:30 | |
| 00:30 next day | 00:30 next day | |
| 01:30 next day | 01:30 next day | |
| 02:30 next day | 02:30 next day | |
| 03:30 next day | 03:30 next day |
London Time Zone and Facts
Time Zone
GMT – Greenwich Mean Time, UTC+0 (standard time)
London Facts
India Standard Time
Offset: IST is 5 hours and 30 minutes ahead of Greenwich Mean Time (GMT).
Countries using this time zone: India
Principal Cities: The largest city in the IST time zone is Mumbai in India, with about 12.692 million people. Other major cities in this time zone include Delhi, Bengaluru, Hyderabad, Ahmedabad.
Daylight Saving: Clocks in India Standard Time (IST) do not change for daylight saving time, so IST stays the same throughout the year. Other time zones may set clocks forward in summer and back in winter; see upcoming clock changes worldwide.
Current time in India: India time now
IST representations, usage and related time zones
- +0530 - basic
- +05:30 - extended
- +0530 - sign character (+) followed by a four digit time providing hours (05) and minutes (30) of the offset. Indicates an offset of five hours and thirty minutes to the east of the zero meridian.
- Asia/Calcutta
- Asia/Kolkata
- India Standard Time - UTC +5:30
- Irish Standard Time - UTC +1
- Israel Standard Time - UTC +2