GMT / BST to IST Converter

Convert London time (GMT/BST) to India Standard Time (IST, UTC+5:30). IST is 5 hours 30 minutes ahead of GMT, or 4 hours 30 minutes ahead of BST in summer. Used by UK - India business teams daily.

Current Time

GMT/BST - London Time
IST - India Standard Time

Convert a Specific Time

Result in IST

24-Hour Reference Table

Midnight-to-midnight in London Time and the corresponding IST time (based on today's date).

GMT/BST (London Time) IST (India Standard Time)

How to Convert GMT to IST

The Formula
IST = GMT + 5:30 (Oct - Mar) / IST = BST + 4:30 (Mar - Oct)
Example
9:00 AM GMT = 2:30 PM IST (same day, winter)
DST Note
UK observes BST (UTC+1) from late March to late October, reducing the GMT - IST gap from 5:30 to 4:30 hours. India has no DST.

Frequently Asked Questions

IST is 5 hours 30 minutes ahead of GMT (winter) and 4 hours 30 minutes ahead of BST (UK summer, March - October).
9:00 AM GMT = 2:30 PM IST. In BST (summer): 9:00 AM BST = 1:30 PM IST.
GMT business hours (9:00 AM - 1:00 PM) align with IST afternoon (2:30 PM - 6:30 PM, winter). In BST: 9:00 AM BST = 1:30 PM IST.
UTC and GMT share the same offset (UTC+0) in winter. However, the UK switches to BST (UTC+1) in summer, so London time differs from UTC by 1 hour during that period.

Zone Facts

● GMT = UTC+0 (Oct - late Mar)
● BST = UTC+1 (late Mar - Oct)
● IST = UTC+5:30 (no DST)
● IST is 5.5 hrs ahead of GMT (winter)
● IST is 4.5 hrs ahead of BST (summer)
● Cities (UK/GMT): London, Edinburgh, Cardiff, Dublin, Reykjavik

⏱️ Quick Reference

GMT (winter) → IST

GMT IST
12:00 AM 05:30 AM
06:00 AM 11:30 AM
09:00 AM 02:30 PM
12:00 PM 05:30 PM
06:00 PM 11:30 PM

Related Converters

UTC to IST
Coordinated Universal Time to IST
IST to UTC
India Standard Time to UTC
UTC to GMT
UTC to Greenwich Mean Time
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