London (GMT/BST) to India Standard Time (IST) Time Converter
What this converter helps you do
GMT to IST is the main scheduling corridor between the UK and India, connecting London financial services, consulting firms, and technology companies with their Indian counterparts in Bangalore, Mumbai, Hyderabad, and Chennai. The offset is five and a half hours year-round from India side, but shifts to four and a half hours during British Summer Time.
This pair is used daily by offshore development teams, customer support operations, legal firms with Indian associates, and the large Indian diaspora community in the UK coordinating with family and business interests back home.
How it works
The tool converts from Europe/London (GMT/BST) to Asia/Kolkata (IST, always UTC+5:30). India does not observe DST, so only the UK side introduces seasonal variation.
Why the half-hour offset matters: IST is UTC+5:30, not a round number. A 2:00 PM London meeting is 7:30 PM IST in winter or 6:30 PM IST in summer. Calendar tools that round to the nearest hour will get this wrong.
Limitation: the converter gives accurate time equivalents but does not factor in Indian or UK bank holidays, local state holidays in India, or shift patterns in BPO operations.
Practical use scenarios
- Schedule a standup between a London product team and a Bangalore development team.
- Find the IST equivalent of a London client presentation for Indian stakeholders.
- Plan customer support shift handoffs between UK and India centres.
- Coordinate legal review deadlines across London and Mumbai offices.
- Check when Indian business hours overlap with London afternoon for urgent calls.
Pair-specific planning notes
- IST is UTC+5:30 all year. The offset from London is 5.5 hours in GMT season and 4.5 hours in BST season. Only the UK side changes clocks.
- The overlap window is better than US-India: a London afternoon (1-5 PM) maps to early-to-mid evening in India (6:30-10:30 PM GMT season or 5:30-9:30 PM BST season).
- India has both national and state-level public holidays that do not align with UK bank holidays. Check both calendars before scheduling critical meetings.
Related tools
FAQ
Five and a half hours during UK winter (GMT) and four and a half hours during UK summer (BST). India does not change clocks.
India Standard Time is UTC+5:30. Any round-hour London time converts to a half-hour IST equivalent. This is a feature of the timezone, not an error.
Early London afternoon (1-3 PM) works well, mapping to 6:30-8:30 PM IST in winter or 5:30-7:30 PM IST in summer. Both sides stay within reasonable hours.
Yes. The converter automatically uses BST when the date falls within the UK summer period, adjusting the offset from 5.5 to 4.5 hours.
Page last built: 2026-04-13.