London to Delhi
+4h 30mLondon
BSTSOURCEDelhi
ISTGreen rows indicate typical business hours (9 AM - 5 PM)
BST and IST on the World Map
The map below highlights the BST (Greenwich Mean Time) and IST (India Standard Time) timezone regions across the globe.
GMT – Greenwich Mean Time
UTC+00:00Greenwich Mean Time (GMT) is the mean solar time at the Royal Observatory in Greenwich, London. It is the same as UTC+00:00.
- •GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London.
- •The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
- •GMT and UTC are often used interchangeably, but UTC is based on atomic clocks.
- •Iceland uses GMT year-round and never observes daylight saving time.
- •The UK switches from GMT to BST (British Summer Time) in late March each year.
IST – India Standard Time
UTC+05:30India Standard Time (IST) is the time zone for India and Sri Lanka, 5 hours and 30 minutes ahead of UTC.
- •India is 10 hours 30 minutes ahead of EST and 5 hours 30 minutes ahead of GMT.
- •India uses a single time zone despite spanning 30° of longitude.
- •IST is one of only a handful of time zones with a 30-minute offset.
- •IST is the most populous single time zone in the world with over 1.4 billion people.
- •The Bombay Stock Exchange (BSE) and National Stock Exchange (NSE) operate on IST.
About London
WikipediaLondon, where Greenwich Mean Time (GMT) originates, is the world's leading financial center alongside New York. The city bridges European and American business hours.
Big Ben is actually the name of the bell inside the Elizabeth Tower, not the tower itself.
About Delhi
WikipediaDelhi operates on India Standard Time (IST), UTC+5:30. As India's capital, Delhi time is synchronized with Mumbai and India's National Stock Exchange.
Delhi serves as India's political capital while Mumbai is the financial capital.
Understanding the +4h 30m Gap: London vs Delhi
London runs on British Summer Time (BST) at UTC+01:00, currently observing daylight saving time. Delhi runs on India Standard Time (IST) at UTC+05:30. That puts London 4 hours 30 minutes ahead of Delhi — a difference of +4h 30m at the current offsets.
In practice, when it is 9:00 AM in London it is 1:30 PM in Delhi. Midnight in London is 4:30 AM in Delhi.London observes daylight saving time while Delhi does not, so the gap narrows or widens by an hour part of the year.
London to Delhi time conversion table
| London (BST) | Delhi (IST) | Day |
|---|---|---|
| 12:00 AM | 4:30 AM | same day |
| 6:00 AM | 10:30 AM | same day |
| 7:00 AM | 11:30 AM | same day |
| 8:00 AM | 12:30 PM | same day |
| 9:00 AM | 1:30 PM | same day |
| 12:00 PM | 4:30 PM | same day |
| 3:00 PM | 7:30 PM | same day |
| 5:00 PM | 9:30 PM | same day |
| 6:00 PM | 10:30 PM | same day |
| 9:00 PM | 1:30 AM | next day |
Why people convert London to Delhi time
- Scheduling a call from London to Delhi: a 10:00 AM start in London lands at 2:30 PM in Delhi, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both London and Delhi are inside the 9-to-5 working day between 9:00 AM and 12:30 PM BST time (1:30 PM–5:00 PM IST). That is roughly 3 hours 30 minutes of usable overlap.
- Coordinating a London-based team with Delhi contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM BST" is unambiguous; "3 PM" across a +4h 30m gap is not.
- Block 9:00 AM–12:30 PM BST as the recurring meeting window if you work primarily from London and need Delhi colleagues present.
- London: Clocks fall back on Sun, Oct 25, 2026. Re-check this page after that date because the offset changes and so does the +4h 30m gap.
About GMT (Greenwich Mean Time)
Greenwich Mean Time (GMT) is the clock time at the Royal Observatory in Greenwich, London, which sits on the Prime Meridian (0° longitude). GMT serves as the reference point from which all other time zones are calculated. The United Kingdom uses GMT during winter months and switches to British Summer Time (BST, UTC+01:00) from late March to late October. Several West African nations use GMT year-round. GMT is often used interchangeably with UTC (Coordinated Universal Time), although technically they are different – UTC is based on atomic clocks while GMT is based on Earth's rotation.
About IST (India Standard Time)
India Standard Time (IST) is the time observed throughout India and Sri Lanka. It is based on the 82.5°E meridian, passing through Mirzapur in Uttar Pradesh. India uses a single time zone despite spanning roughly 30° of longitude, which has been debated. IST does not observe daylight saving time. India is the world's most populous country, making IST one of the most-used time zones globally. The IT outsourcing industry and call centers operate primarily on IST, making the EST-to-IST conversion one of the most searched timezone conversions.
Best time to call between London and Delhi
Both London and Delhi sit inside the 9 AM – 5 PM working day between 9:00 AM–12:30 PM BST, which is 1:30 PM–5:00 PM IST. That gives roughly 3 hours and 30 minutes of shared time — the safest window for a live call or meeting.
Business hours overlap
London and Delhi overlap for about 3 hours during the working day — enough for meetings if you avoid the edges of the window.
London is 4 hours 30 minutes ahead of Delhi (BST UTC+01:00 → IST UTC+05:30). The shared working window is 9:00 AM–12:30 PM BST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
London
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 2026
Delhi
Does not observe DST
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between London and Delhi?
London (BST, UTC+01:00) is 4 hours 30 minutes ahead of Delhi (IST, UTC+05:30). The gap is currently +4h 30m.
How do I convert London time to Delhi time?
Add +4h 30m to London local time. For example, 9:00 AM in London is 1:30 PM in Delhi.
What time is it in Delhi right now?
Delhi uses IST at UTC+05:30. Use the live converter at the top of this page — it updates in real time and already accounts for the +4h 30m offset from London.
What is the best time to call Delhi from London?
Call between 9:00 AM and 12:30 PM BST — that maps to 1:30 PM–5:00 PM IST and keeps both parties inside the working day.
Which is ahead, London or Delhi?
London is 4 hours 30 minutes ahead of Delhi. When it is 12:00 PM in London it is 4:30 PM in Delhi.
Do London and Delhi use different time zones?
London (UK) uses BST at UTC+01:00, while Delhi (India) uses IST at UTC+05:30. The IANA identifiers are Europe/London and Asia/Kolkata.
Does daylight saving time affect the London–Delhi difference?
Yes at the moment: London is on daylight saving time and Delhi is not, so the +4h 30m gap shifts by an hour when exactly one of them changes clocks.
Which other cities share London's time zone?
BST also covers London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar and 5 more.
Which countries use BST, London's zone?
BST is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, Mali, Mauritania and 7 more.
Is there a day difference between London and Delhi?
Not normally. The +4h 30m gap only pushes the date over for late-evening times.
What is the time difference between London and Delhi?
Delhi is +4h 30m from London.
What timezone is London in?
London, where Greenwich Mean Time (GMT) originates, is the world's leading financial center alongside New York. The city bridges European and American business hours.
What timezone is Delhi in?
Delhi operates on India Standard Time (IST), UTC+5:30. As India's capital, Delhi time is synchronized with Mumbai and India's National Stock Exchange.
What are the business hours in London?
Standard business hours in London are 9:00 AM - 5:00 PM GMT.
What are the business hours in Delhi?
Standard business hours in Delhi are 9:30 AM - 5:30 PM IST.
What is the best time to schedule a call between London and Delhi?
The best overlap for a call is when both cities are in business hours. London works 9:00 AM - 5:00 PM GMT and Delhi works 9:30 AM - 5:30 PM IST (+4h 30m difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in London and Delhi?
London uses GBP (£) while Delhi uses INR (₹). Check current exchange rates when planning travel or business between these cities.
How do London and Delhi compare in size?
London has a population of approximately 8.8 million (metro: 14.8 million), while Delhi has approximately 11 million (metro: 32.9 million).
What are the major landmarks in London and Delhi?
London is known for Big Ben, Tower Bridge, Buckingham Palace. Delhi is famous for India Gate, Red Fort, Qutub Minar.
Do London and Delhi have stock exchanges?
Yes. London has the LSE (London Stock Exchange) and Delhi has the NSE (National Stock Exchange). The +4h 30m time difference affects trading hour overlaps between these exchanges.
Which countries use GMT (Greenwich Mean Time)?
GMT is used in United Kingdom, Ireland, Iceland, Portugal (mainland), Ghana, Senegal, and 9 more countries.
Does GMT observe daylight saving time?
Yes, GMT switches to BST during summer months.
What are some interesting facts about GMT?
GMT is based on the Prime Meridian (0° longitude) passing through Greenwich, London. The Royal Observatory in Greenwich has been the reference point for GMT since 1884.
Which cities are in the IST timezone?
Major cities in the IST timezone include Mumbai, Delhi, Bangalore, Kolkata, Chennai, Hyderabad, Pune, Ahmedabad.
What is the UTC offset for IST?
India Standard Time (IST) is at UTC+05:30.
What should I know about the IST timezone?
India is 10 hours 30 minutes ahead of EST and 5 hours 30 minutes ahead of GMT. India uses a single time zone despite spanning 30° of longitude.
When is it midnight in London, what time is it in Delhi?
When it is 12:00 AM (midnight) in London (GMT), it is +4h 30m later in Delhi (IST).
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