London to ICT
+6hLondon
BSTSOURCEICT
ICTGreen rows indicate typical business hours (9 AM - 5 PM)
BST and ICT on the World Map
The map below highlights the BST (Greenwich Mean Time) and ICT (Indochina 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.
ICT – Indochina Time
UTC+07:00Indochina Time (ICT) is the time zone for Vietnam, Thailand, Laos, and Cambodia, 7 hours ahead of UTC.
- •Bangkok is one of the most visited cities in the world.
- •ICT is 12 hours ahead of EST.
- •Thailand, Vietnam, and Cambodia all share ICT.
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.
Understanding the +6h Gap: London vs ICT
London runs on British Summer Time (BST) at UTC+01:00, currently observing daylight saving time. ICT runs on Indochina Time (ICT) at UTC+07:00. That puts London 6 hours ahead of ICT — a difference of +6h at the current offsets.
In practice, when it is 9:00 AM in London it is 3:00 PM in ICT. Midnight in London is 6:00 AM in ICT.London observes daylight saving time while ICT does not, so the gap narrows or widens by an hour part of the year.
London to ICT time conversion table
| London (BST) | ICT (ICT) | Day |
|---|---|---|
| 12:00 AM | 6:00 AM | same day |
| 6:00 AM | 12:00 PM | same day |
| 7:00 AM | 1:00 PM | same day |
| 8:00 AM | 2:00 PM | same day |
| 9:00 AM | 3:00 PM | same day |
| 12:00 PM | 6:00 PM | same day |
| 3:00 PM | 9:00 PM | same day |
| 5:00 PM | 11:00 PM | same day |
| 6:00 PM | 12:00 AM | next day |
| 9:00 PM | 3:00 AM | next day |
Why people convert London to ICT time
- Scheduling a call from London to ICT: a 10:00 AM start in London lands at 4:00 PM in ICT, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both London and ICT are inside the 9-to-5 working day between 9:00 AM and 11:00 AM BST time (3:00 PM–5:00 PM ICT). That is roughly 2 hours of usable overlap.
- Coordinating a London-based team with ICT 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 +6h gap is not.
- Block 9:00 AM–11:00 AM BST as the recurring meeting window if you work primarily from London and need ICT 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 +6h 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 ICT (Indochina Time)
Indochina Time (ICT) is used across Southeast Asia including Vietnam, Thailand, Laos, and Cambodia. Indonesia (Western time, WIB) also uses UTC+07:00. ICT does not observe daylight saving time.
Best time to call between London and ICT
Both London and ICT sit inside the 9 AM – 5 PM working day between 9:00 AM–11:00 AM BST, which is 3:00 PM–5:00 PM ICT. That gives roughly 2 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
London and ICT overlap for about 2 hours during the working day — enough for meetings if you avoid the edges of the window.
London is 6 hours ahead of ICT (BST UTC+01:00 → ICT UTC+07:00). The shared working window is 9:00 AM–11:00 AM 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
ICT
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 ICT?
London (BST, UTC+01:00) is 6 hours ahead of ICT (ICT, UTC+07:00). The gap is currently +6h.
How do I convert London time to ICT time?
Add +6h to London local time. For example, 9:00 AM in London is 3:00 PM in ICT.
What time is it in ICT right now?
ICT uses ICT at UTC+07:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +6h offset from London.
What is the best time to call ICT from London?
Call between 9:00 AM and 11:00 AM BST — that maps to 3:00 PM–5:00 PM ICT and keeps both parties inside the working day.
Which is ahead, London or ICT?
London is 6 hours ahead of ICT. When it is 12:00 PM in London it is 6:00 PM in ICT.
Do London and ICT use different time zones?
London (UK) uses BST at UTC+01:00, while ICT uses ICT at UTC+07:00. The IANA identifiers are Europe/London and Asia/Bangkok.
Does daylight saving time affect the London–ICT difference?
Yes at the moment: London is on daylight saving time and ICT is not, so the +6h 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 ICT?
Not normally. The +6h gap only pushes the date over for late-evening times.
What is the time difference between London and ICT?
ICT is +6h 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 ICT in?
ICT operates on its local timezone.
What are the business hours in London?
Standard business hours in London are 9:00 AM - 5:00 PM GMT.
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 ICT timezone?
Major cities in the ICT timezone include Bangkok, Ho Chi Minh City, Hanoi, Jakarta, Phnom Penh, Vientiane.
What is the UTC offset for ICT?
Indochina Time (ICT) is at UTC+07:00.
What should I know about the ICT timezone?
Bangkok is one of the most visited cities in the world. ICT is 12 hours ahead of EST.
When is it midnight in London, what time is it in ICT?
When it is 12:00 AM (midnight) in London (GMT), it is +6h later in ICT (ICT).
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