Our free IST to GMT converter instantly translates India Standard Time into Greenwich Mean Time for London. Whether you are scheduling a meeting between Mumbai, Delhi, or Bangalore and London, Manchester, or any UK city, this tool removes the mental math and shows you the exact local time on both sides.
India Standard Time (IST) is ahead of Greenwich Mean Time (GMT). The exact gap depends on whether the UK is observing daylight saving time: (Time-zone offsets follow the IANA Time Zone Database, the authoritative source operating systems use for time-zone rules.)
Because of the time gap, overlapping working hours exist but require early or late shifts on one side. These windows tend to work best:
IST is 5 hours and 30 minutes ahead of GMT during UK winter, and 4 hours and 30 minutes ahead during British Summer Time (BST).
Yes. When the UK transitions to and from British Summer Time (BST) in late March and late October, the difference shifts by one hour. India does not observe daylight saving, so it stays at UTC+5:30 year-round.
2:30 PM IST is 9:00 AM GMT during UK winter (late October to late March), and 10:00 AM BST during UK summer (late March to late October).
GMT is 5 hours 30 minutes behind IST, shifting by an hour around daylight-saving changes. 100% free, no registration, and fully private — every conversion happens in your browser.
Uses the IANA database for Asia/Kolkata and Europe/London, so daylight saving is applied automatically — no manual offset math.
Convert IST to GMT the moment you pick a time. No signup, no ads in your way, nothing to install.
Find the Mumbai ↔ London overlap fast — both cities are in business hours roughly 2:30 PM–5:00 PM IST.
Every conversion runs locally in your browser using your device clock. Your dates and times never touch a server.
Reverse conversion
From India Standard Time
From India Standard Time
From India Standard Time
To Greenwich Mean Time
To Greenwich Mean Time
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