GMT to IST Time Converter
Live clocks, hourly reference table, and best meeting times for London and India.
24-Hour Comparison Timeline
Green = working hours · Yellow = early/late · Red = night
Time difference & DST
India Standard Time is 5 hours 30 minutes ahead of Greenwich Mean Time — one of the world's most historically significant time-zone relationships thanks to centuries of trade and travel between the UK and the Indian subcontinent. The half-hour offset originated with British-era timekeeping in India.
India does not observe daylight saving. When the UK moves to British Summer Time (BST, UTC+1), the effective gap with India shrinks to 4 hours 30 minutes — a subtle but important shift for scheduling recurring meetings.
Best time to schedule a call
London mornings and India afternoons overlap gracefully. 9:00 AM–12:30 PM GMT lands as 2:30 PM–6:00 PM IST, providing a full half-day of comfortable cross-border collaboration for teams in Bangalore, Mumbai, and Delhi working with counterparts in London.
24-hour reference table
Hour-by-hour mapping for today's date. Values update automatically as daylight-saving transitions occur.
| GMT (London) | IST (India) |
|---|---|
| 12:00 AM | 04:30 AM |
| 01:00 AM | 05:30 AM |
| 02:00 AM | 06:30 AM |
| 03:00 AM | 07:30 AM |
| 04:00 AM | 08:30 AM |
| 05:00 AM | 09:30 AM |
| 06:00 AM | 10:30 AM |
| 07:00 AM | 11:30 AM |
| 08:00 AM | 12:30 PM |
| 09:00 AM | 01:30 PM |
| 10:00 AM | 02:30 PM |
| 11:00 AM | 03:30 PM |
| 12:00 PM | 04:30 PM |
| 01:00 PM | 05:30 PM |
| 02:00 PM | 06:30 PM |
| 03:00 PM | 07:30 PM |
| 04:00 PM | 08:30 PM |
| 05:00 PM | 09:30 PM |
| 06:00 PM | 10:30 PM |
| 07:00 PM | 11:30 PM |
| 08:00 PM | 12:30 AM(Sun, Jul 5) |
| 09:00 PM | 01:30 AM(Sun, Jul 5) |
| 10:00 PM | 02:30 AM(Sun, Jul 5) |
| 11:00 PM | 03:30 AM(Sun, Jul 5) |
Frequently asked questions
What is the time difference between GMT and IST?+
IST is 5 hours 30 minutes ahead of GMT. During British Summer Time (BST), the gap narrows to 4 hours 30 minutes.
Does India change clocks in summer?+
No. India Standard Time is fixed at UTC+5:30 year-round; only the UK side of this pairing shifts with BST.
What time in India is 10 AM in London?+
10:00 AM GMT is 3:30 PM IST. During BST, 10:00 AM in London corresponds to 2:30 PM in India.