Vietnam to Vienna
-5hVietnam
ICTSOURCEVienna
CESTGreen rows indicate typical business hours (9 AM - 5 PM)
ICT and CEST on the World Map
The map below highlights the ICT (Indochina Time) and CEST (Central European 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.
CET – Central European Time
UTC+01:00Central European Time (CET) is used across most of Western and Central Europe, 1 hour ahead of UTC.
- •CET covers more European countries than any other time zone.
- •Spain uses CET despite being geographically aligned with GMT/WET.
- •The Frankfurt Stock Exchange, Euronext (Amsterdam/Paris), and Borsa Italiana operate on CET.
- •Over 500 million people live in the CET time zone.
- •France moved to CET during the German occupation in WWII and never switched back.
About Vienna
WikipediaVienna operates on Central European Time (CET/CEST). As a major EU hub and headquarters for international organizations, Vienna coordinates Central European business.
Vienna has more than 50 theaters and opera houses.
Comparing Time Zones: Vietnam and Vienna
Vietnam runs on Indochina Time (ICT) at UTC+07:00. Vienna runs on Central European Summer Time (CEST) at UTC+02:00, also currently on daylight saving time. That puts Vietnam 5 hours behind Vienna — a difference of -5h at the current offsets.
In practice, when it is 9:00 AM in Vietnam it is 4:00 AM in Vienna. Midnight in Vietnam is 7:00 PM in Vienna.Vienna observes daylight saving time while Vietnam does not, so the gap narrows or widens by an hour part of the year.
Vietnam to Vienna time conversion table
| Vietnam (ICT) | Vienna (CEST) | Day |
|---|---|---|
| 12:00 AM | 7:00 PM | previous day |
| 6:00 AM | 1:00 AM | same day |
| 7:00 AM | 2:00 AM | same day |
| 8:00 AM | 3:00 AM | same day |
| 9:00 AM | 4:00 AM | same day |
| 12:00 PM | 7:00 AM | same day |
| 3:00 PM | 10:00 AM | same day |
| 5:00 PM | 12:00 PM | same day |
| 6:00 PM | 1:00 PM | same day |
| 9:00 PM | 4:00 PM | same day |
Why people convert Vietnam to Vienna time
- Scheduling a call from Vietnam to Vienna: a 10:00 AM start in Vietnam lands at 5:00 AM in Vienna, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Vietnam and Vienna are inside the 9-to-5 working day between 2:00 PM and 5:00 PM ICT time (9:00 AM–12:00 PM CEST). That is roughly 3 hours of usable overlap.
- Coordinating a Vietnam-based team with Vienna 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 ICT" is unambiguous; "3 PM" across a -5h gap is not.
- Block 2:00 PM–5:00 PM ICT as the recurring meeting window if you work primarily from Vietnam and need Vienna colleagues present.
- Vienna: 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 CET (Central European Time)
Central European Time (CET) is the standard time zone for most of Europe, covering over 30 countries from Spain to Poland, and from Norway to Italy. CET is 1 hour ahead of GMT and is used by the European Union's most populous nations. During summer, most CET countries switch to Central European Summer Time (CEST, UTC+02:00). Major European financial markets in Frankfurt, Paris, and Amsterdam operate on CET.
Best time to call between Vietnam and Vienna
Both Vietnam and Vienna sit inside the 9 AM – 5 PM working day between 2:00 PM–5:00 PM ICT, which is 9:00 AM–12:00 PM CEST. That gives roughly 3 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
Vietnam and Vienna overlap for about 3 hours during the working day — enough for meetings if you avoid the edges of the window.
Vietnam is 5 hours behind Vienna (ICT UTC+07:00 → CEST UTC+02:00). The shared working window is 2:00 PM–5:00 PM ICT. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
Vietnam
Does not observe DST
Vienna
☀ Currently in DST
Standard: UTC+01:00 · DST: UTC+02:00
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 Vienna?
Vietnam (ICT, UTC+07:00) is 5 hours behind Vienna (CEST, UTC+02:00). The gap is currently -5h.
How do I convert Vietnam time to Vienna time?
Add -5h to Vietnam local time. For example, 9:00 AM in Vietnam is 4:00 AM in Vienna.
What time is it in Vienna right now?
Vienna uses CEST at UTC+02:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -5h offset from Vietnam.
What is the best time to call Vienna from Vietnam?
Call between 2:00 PM and 5:00 PM ICT — that maps to 9:00 AM–12:00 PM CEST and keeps both parties inside the working day.
Which is behind, Vietnam or Vienna?
Vietnam is 5 hours behind Vienna. When it is 12:00 PM in Vietnam it is 7:00 AM in Vienna.
Do Vietnam and Vienna use different time zones?
Vietnam (Vietnam) uses ICT at UTC+07:00, while Vienna (Austria) uses CEST at UTC+02:00. The IANA identifiers are Asia/Ho_Chi_Minh and Europe/Vienna.
Does daylight saving time affect the Vietnam–Vienna difference?
Yes at the moment: Vienna is on daylight saving time and Vietnam is not, so the -5h 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 Vienna?
Not normally. The -5h gap only pushes the date over the previous day.
What is the time difference between Vietnam and Vienna?
Vienna is -5h from Vietnam.
What timezone is Vietnam in?
Vietnam operates on its local timezone.
What timezone is Vienna in?
Vienna operates on Central European Time (CET/CEST). As a major EU hub and headquarters for international organizations, Vienna coordinates Central European business.
What are the business hours in Vienna?
Standard business hours in Vienna are 8:00 AM - 5:00 PM CET.
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 CET timezone?
Major cities in the CET timezone include Paris, Berlin, Rome, Madrid, Amsterdam, Brussels, Vienna, Warsaw.
What is the UTC offset for CET?
Central European Time (CET) is at UTC+01:00. During daylight saving time, it shifts to CEST.
What should I know about the CET timezone?
CET covers more European countries than any other time zone. Spain uses CET despite being geographically aligned with GMT/WET.
When is it midnight in Vietnam, what time is it in Vienna?
When it is 12:00 AM (midnight) in Vietnam (ICT), it is -5h later in Vienna (CET).
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