Timezone conversion
GMT to IST Converter (2026)
IST (India Standard Time) is 5 hours and 30 minutes ahead of GMT (Greenwich Mean Time). When it's 12:00 noon GMT in London, it's 5:30 PM IST in Mumbai and New Delhi. This table uses the fixed GMT → IST standard-time offset; the live clocks below always reflect the correct current gap, including UK British Summer Time.
Last updated June 25, 2026 · Maintained by Clockjumper
IST is 5h30m ahead of GMT. Add 5 hours 30 minutes to GMT to get IST. The best window for a live UK–India call is 9:00 AM – 12:30 PM GMT (2:30 – 6:00 PM IST) — the end of the Indian workday overlapping the UK morning. From late March to late October the UK is on BST (UTC+1), so the gap shrinks to 4h30m and this window shifts an hour later in the UK.
IST is currently 4h30m ahead of GMT.
Right now London (UK) is on BST (UTC+1) and New Delhi / Mumbai (India) on GMT+5:30 (UTC+5:30). This flips back to the standard GMT/IST gap once daylight saving ends.
Live clocks above use each region's current local time (DST-aware). The reference table below uses the fixed GMT → IST standard offset — see the DST section for how the gap changes across the year.
Interactive converter
12:00PM
Key conversion times
- 6:00 AM GMT11:30 AM ISTEarly GMT — mid-morning in India, first live overlap of the day
- 9:00 AM GMT2:30 PM ISTStart of the UK workday — early afternoon in India, prime call slot
- 12:00 PM GMT5:30 PM ISTLondon noon — end of the Indian workday, last easy live window
- 2:30 PM GMT8:00 PM ISTLondon mid-afternoon — Indian evening, past normal working hours in India
- 5:00 PM GMT10:30 PM ISTEnd of the UK workday — late evening in India
Full GMT to IST conversion table
| GMT (London) | IST (Mumbai) |
|---|---|
| 12:00 AM | 5:30 AM |
| 1:00 AM | 6:30 AM |
| 2:00 AM | 7:30 AM |
| 3:00 AM | 8:30 AM |
| 4:00 AM | 9:30 AM |
| 5:00 AM | 10:30 AM |
| 6:00 AM | 11:30 AM |
| 7:00 AM | 12:30 PM |
| 8:00 AM | 1:30 PM |
| 9:00 AM | 2:30 PM |
| 10:00 AM | 3:30 PM |
| 11:00 AM | 4:30 PM |
| 12:00 PM | 5:30 PM |
| 1:00 PM | 6:30 PM |
| 2:00 PM | 7:30 PM |
| 3:00 PM | 8:30 PM |
| 4:00 PM | 9:30 PM |
| 5:00 PM | 10:30 PM |
| 6:00 PM | 11:30 PM |
| 7:00 PM | 12:30 AM(next day) |
| 8:00 PM | 1:30 AM(next day) |
| 9:00 PM | 2:30 AM(next day) |
| 10:00 PM | 3:30 AM(next day) |
| 11:00 PM | 4:30 AM(next day) |
Daylight saving and how the gap changes
GMT itself is a fixed UTC+0 reference and never observes daylight saving. UK civil time, however, switches to British Summer Time (BST, UTC+1) on the last Sunday of March and back to GMT on the last Sunday of October. India does not observe daylight saving, so IST is UTC+5:30 all year. The result: London ↔ India is +5h30m in the UK winter and +4h30m for most of the UK summer.
Common mistake: abbreviation collision
This page treats "IST" as India Standard Time (Asia/Kolkata, UTC+5:30). The same abbreviation is also used for Irish Standard Time and Israel Standard Time, which are entirely different offsets. If you meant one of those, use the relevant city-time page instead.
Frequently asked questions
- What is the time difference between GMT and IST?
- IST (India Standard Time) is 5 hours and 30 minutes ahead of GMT (Greenwich Mean Time). When it's 9:00 AM GMT, it's 2:30 PM IST the same day.
- Is the gap always 5h30m if I mean UK time?
- No. GMT itself is UTC+0 year-round, but UK civil time switches to BST (UTC+1) from the last Sunday of March to the last Sunday of October. During those months the London ↔ India gap is 4h30m, not 5h30m. This page's fixed table uses standard GMT; the live clocks above show the correct current offset.
- What time is 9 AM GMT in IST?
- 9:00 AM GMT is 2:30 PM IST.
- What time is 5 PM IST in GMT?
- 5:00 PM IST is 11:30 AM GMT the same day.
- When is the best time to schedule a UK–India meeting?
- 9:00 AM – 12:30 PM GMT (2:30 – 6:00 PM IST) is the widest overlap inside both sides' normal workday. During UK summer (BST), shift one hour later in UK local time so IST still lands before 6:00 PM in India.
- Does "IST" on this page mean India, Ireland, or Israel?
- India. All figures on this page use India Standard Time (Asia/Kolkata, UTC+5:30). Irish Standard Time is UTC+1 and Israel Standard Time is UTC+2 — different offsets that happen to share the same three letters.