GMT to IST Time Zone Converter
This converts London time (GMT in winter, BST in summer) to India Standard Time — Mumbai, Delhi, Bengaluru. India is 5.5 hours ahead of London in winter and 4.5 hours ahead in summer. The gap changes because India never observes daylight saving while London does. The tool applies the right offset for the date you pick.
Enter a date and time to convert.
Daylight saving is applied automatically for the date you pick. Labels like PST/EST name the zone (Pacific/Eastern); the real abbreviation shifts to PDT/EDT during daylight saving, and gmt here means London (GMT in winter, BST in summer) while utc stays fixed.
The time difference
India is ahead of London, but by how much depends on the season. In winter India runs 5.5 hours ahead; in summer it's 4.5 hours ahead. The reason is simple: India never changes its clocks, while London springs forward an hour for British Summer Time. When London jumps ahead, it closes the gap to India by an hour, then reopens it in the fall. Either way, add the half hour — India sits at UTC+5:30.
A worked example
Take 9:00 AM in London. On January 15, 2026 (winter), that is 2:30 PM IST in Mumbai — 5.5 hours ahead. On July 15, 2026 (summer), the same 9:00 AM London is 1:30 PM IST, only 4.5 hours ahead, because London has moved to summer time and pulled closer.
Daylight saving & the abbreviation caveat
"GMT" here is London's clock — GMT in winter, BST (British Summer Time) in summer, with London switching on March 29 and October 25, 2026. India Standard Time (IST), on the other hand, never changes — it stays at UTC+5:30 all year. So the gap being 5.5 hours in January but 4.5 hours in July isn't an error; it's London moving while India stays fixed. The converter tracks London's season automatically for the date you choose.
When you'll use it
Essential for coordinating with offshore teams in Bengaluru or Hyderabad, scheduling a call with family or clients in India, or timing a cricket match or festival broadcast. Since India is well ahead, London mornings line up with Indian afternoons — usually the easiest window to catch each other live.
Frequently asked questions
How far ahead is India from London?
5.5 hours in winter and 4.5 hours in summer. India's clock never moves, but London springs an hour forward for summer, which narrows the gap by an hour from late March to late October.
Why is India half an hour off?
India Standard Time is set at UTC+5:30 — a half-hour offset the whole country shares. That's why every conversion to IST lands on a :30 minute mark rather than on the hour.
Does India observe daylight saving?
No. India keeps the same clock all year. Any change in the gap comes entirely from London moving to British Summer Time and back.