KST to Vietnam
-2hKST
KSTSOURCEVietnam
ICTGreen rows indicate typical business hours (9 AM - 5 PM)
KST and ICT on the World Map
The map below highlights the KST (Korea Standard Time) and ICT (Indochina Time) timezone regions across the globe.
KST – Korea Standard Time
UTC+09:00Korea Standard Time (KST) is the time zone for South Korea, 9 hours ahead of UTC.
- •South Korea does not observe daylight saving time.
- •Seoul is home to Samsung, LG, and Hyundai headquarters.
- •KST is the same offset as JST (UTC+09:00).
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.
KST vs Vietnam: Offsets, DST and Best Call Times
KST runs on Korea Standard Time (KST) at UTC+09:00. Vietnam runs on Indochina Time (ICT) at UTC+07:00. That puts KST 2 hours behind Vietnam — a difference of -2h at the current offsets.
In practice, when it is 9:00 AM in KST it is 7:00 AM in Vietnam. Midnight in KST is 10:00 PM in Vietnam. Neither zone observes daylight saving time, so the offset between them stays constant all year.
KST to Vietnam time conversion table
| KST (KST) | Vietnam (ICT) | Day |
|---|---|---|
| 12:00 AM | 10:00 PM | previous day |
| 6:00 AM | 4:00 AM | same day |
| 7:00 AM | 5:00 AM | same day |
| 8:00 AM | 6:00 AM | same day |
| 9:00 AM | 7:00 AM | same day |
| 12:00 PM | 10:00 AM | same day |
| 3:00 PM | 1:00 PM | same day |
| 5:00 PM | 3:00 PM | same day |
| 6:00 PM | 4:00 PM | same day |
| 9:00 PM | 7:00 PM | same day |
Why people convert KST to Vietnam time
- Scheduling a call from KST to Vietnam: a 10:00 AM start in KST lands at 8:00 AM in Vietnam, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both KST and Vietnam are inside the 9-to-5 working day between 11:00 AM and 5:00 PM KST time (9:00 AM–3:00 PM ICT). That is roughly 6 hours of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in KST is 6:00 PM in Vietnam makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM KST" is unambiguous; "3 PM" across a -2h gap is not.
- Block 11:00 AM–5:00 PM KST as the recurring meeting window if you work primarily from KST and need Vietnam colleagues present.
About KST (Korea Standard Time)
Korea Standard Time (KST) is the time zone used in South Korea. It shares the same UTC offset as Japan Standard Time but is a distinct time zone. South Korea does not observe daylight saving time. Seoul, the capital, is a major global tech and business hub.
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 KST and Vietnam
Both KST and Vietnam sit inside the 9 AM – 5 PM working day between 11:00 AM–5:00 PM KST, which is 9:00 AM–3:00 PM ICT. That gives roughly 6 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
KST and Vietnam share 6 hours of working-hours overlap (11:00 AM–5:00 PM KST), so scheduling a live meeting is straightforward.
KST is 2 hours behind Vietnam (KST UTC+09:00 → ICT UTC+07:00). The shared working window is 11:00 AM–5:00 PM KST. Remember to re-check around daylight-saving transitions.
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 KST and Vietnam?
KST (KST, UTC+09:00) is 2 hours behind Vietnam (ICT, UTC+07:00). The gap is currently -2h.
How do I convert KST time to Vietnam time?
Add -2h to KST local time. For example, 9:00 AM in KST is 7:00 AM in Vietnam.
What time is it in Vietnam right now?
Vietnam 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 -2h offset from KST.
What is the best time to call Vietnam from KST?
Call between 11:00 AM and 5:00 PM KST — that maps to 9:00 AM–3:00 PM ICT and keeps both parties inside the working day.
Which is behind, KST or Vietnam?
KST is 2 hours behind Vietnam. When it is 12:00 PM in KST it is 10:00 AM in Vietnam.
Do KST and Vietnam use different time zones?
KST uses KST at UTC+09:00, while Vietnam (Vietnam) uses ICT at UTC+07:00. The IANA identifiers are Asia/Seoul and Asia/Ho_Chi_Minh.
Does daylight saving time affect the KST–Vietnam difference?
Neither zone observes daylight saving time, so the -2h offset between KST and Vietnam is fixed all year.
Which other cities share KST's time zone?
KST also covers Seoul, Busan, Incheon, Daegu, Daejeon, Pyongyang.
Which countries use KST, KST's zone?
KST is used in South Korea, North Korea.
Is there a day difference between KST and Vietnam?
Not normally. The -2h gap only pushes the date over the previous day.
What is the time difference between KST and Vietnam?
Vietnam is -2h from KST.
What timezone is KST in?
KST operates on its local timezone.
What timezone is Vietnam in?
Vietnam operates on its local timezone.
Which countries use KST (Korea Standard Time)?
KST is used in South Korea, North Korea.
Does KST observe daylight saving time?
No, KST does not observe daylight saving time and remains at UTC+09:00 year-round.
What are some interesting facts about KST?
South Korea does not observe daylight saving time. Seoul is home to Samsung, LG, and Hyundai headquarters.
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 KST, what time is it in Vietnam?
When it is 12:00 AM (midnight) in KST (KST), it is -2h later in Vietnam (ICT).
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