Vietnam to London
-6hVietnam
ICTSOURCELondon
BSTGreen rows indicate typical business hours (9 AM - 5 PM)
ICT and BST on the World Map
The map below highlights the ICT (Indochina Time) and BST (Greenwich Mean Time) timezone regions across the globe.
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.
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.
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.
Time Conversion Guide: Vietnam to London
Vietnam runs on Indochina Time (ICT) at UTC+07:00. London runs on British Summer Time (BST) at UTC+01:00, also currently on daylight saving time. That puts Vietnam 6 hours behind London — a difference of -6h at the current offsets.
In practice, when it is 9:00 AM in Vietnam it is 3:00 AM in London. Midnight in Vietnam is 6:00 PM in London.London observes daylight saving time while Vietnam does not, so the gap narrows or widens by an hour part of the year.
Vietnam to London time conversion table
| Vietnam (ICT) | London (BST) | Day |
|---|---|---|
| 12:00 AM | 6:00 PM | previous day |
| 6:00 AM | 12:00 AM | same day |
| 7:00 AM | 1:00 AM | same day |
| 8:00 AM | 2:00 AM | same day |
| 9:00 AM | 3:00 AM | same day |
| 12:00 PM | 6:00 AM | same day |
| 3:00 PM | 9:00 AM | same day |
| 5:00 PM | 11:00 AM | same day |
| 6:00 PM | 12:00 PM | same day |
| 9:00 PM | 3:00 PM | same day |
Why people convert Vietnam to London time
- Scheduling a call from Vietnam to London: a 10:00 AM start in Vietnam lands at 4:00 AM in London, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Vietnam and London are inside the 9-to-5 working day between 3:00 PM and 5:00 PM ICT time (9:00 AM–11:00 AM BST). That is roughly 2 hours of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in Vietnam is 2:00 PM in London makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM ICT" is unambiguous; "3 PM" across a -6h gap is not.
- Block 3:00 PM–5:00 PM ICT as the recurring meeting window if you work primarily from Vietnam and need London colleagues present.
- London: Clocks fall back on Sun, Oct 25, 2026. Any meeting series spanning that date will shift by an hour in local time.
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.
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.
Best time to call between Vietnam and London
Both Vietnam and London sit inside the 9 AM – 5 PM working day between 3:00 PM–5:00 PM ICT, which is 9:00 AM–11:00 AM BST. That gives roughly 2 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
Vietnam and London overlap for about 2 hours during the working day — enough for meetings if you avoid the edges of the window.
Vietnam is 6 hours behind London (ICT UTC+07:00 → BST UTC+01:00). The shared working window is 3:00 PM–5:00 PM ICT. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
Vietnam
Does not observe DST
London
☀ Currently in DST
Standard: UTC+00:00 · DST: UTC+01:00
Clocks fall back on Sun, Oct 25, 2026
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 Vietnam and London?
Vietnam (ICT, UTC+07:00) is 6 hours behind London (BST, UTC+01:00). The gap is currently -6h.
How do I convert Vietnam time to London time?
Add -6h to Vietnam local time. For example, 9:00 AM in Vietnam is 3:00 AM in London.
What time is it in London right now?
London uses BST at UTC+01:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -6h offset from Vietnam.
What is the best time to call London from Vietnam?
Call between 3:00 PM and 5:00 PM ICT — that maps to 9:00 AM–11:00 AM BST and keeps both parties inside the working day.
Which is behind, Vietnam or London?
Vietnam is 6 hours behind London. When it is 12:00 PM in Vietnam it is 6:00 AM in London.
Do Vietnam and London use different time zones?
Vietnam (Vietnam) uses ICT at UTC+07:00, while London (UK) uses BST at UTC+01:00. The IANA identifiers are Asia/Ho_Chi_Minh and Europe/London.
Does daylight saving time affect the Vietnam–London difference?
Yes at the moment: London is on daylight saving time and Vietnam is not, so the -6h gap shifts by an hour when exactly one of them changes clocks.
Which other cities share Vietnam's time zone?
ICT also covers Bangkok, Ho Chi Minh City, Hanoi, Jakarta, Phnom Penh, Vientiane.
Which countries use ICT, Vietnam's zone?
ICT is used in Thailand, Vietnam, Cambodia, Laos, Indonesia (WIB).
Is there a day difference between Vietnam and London?
Not normally. The -6h gap only pushes the date over the previous day.
What is the time difference between Vietnam and London?
London is -6h from Vietnam.
What timezone is Vietnam in?
Vietnam operates on its local timezone.
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 are the business hours in London?
Standard business hours in London are 9:00 AM - 5:00 PM GMT.
Which countries use ICT (Indochina Time)?
ICT is used in Thailand, Vietnam, Cambodia, Laos, Indonesia (WIB).
Does ICT observe daylight saving time?
No, ICT does not observe daylight saving time and remains at UTC+07:00 year-round.
What are some interesting facts about ICT?
Bangkok is one of the most visited cities in the world. ICT is 12 hours ahead of EST.
Which cities are in the GMT timezone?
Major cities in the GMT timezone include London, Dublin, Lisbon, Accra, Reykjavik, Edinburgh, Casablanca, Dakar.
What is the UTC offset for GMT?
Greenwich Mean Time (GMT) is at UTC+00:00. During daylight saving time, it shifts to BST.
What should I know about the GMT timezone?
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.
When is it midnight in Vietnam, what time is it in London?
When it is 12:00 AM (midnight) in Vietnam (ICT), it is -6h later in London (GMT).
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