Vietnam to CST
-13hVietnam
ICTSOURCECST
CSTGreen rows indicate typical business hours (9 AM - 5 PM)
ICT and CST on the World Map
The map below highlights the ICT (Indochina Time) and CST (Central Standard 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.
CST – Central Standard Time
UTC-06:00Central Standard Time (CST) is the time zone for the central United States, Canada, and Mexico, 6 hours behind UTC.
- •CST covers 20 US states fully or partially.
- •Chicago and Houston are the two largest cities in the Central Time Zone.
- •Mexico City, one of the world's most populous cities, operates on CST.
- •CST is 1 hour behind EST and 2 hours ahead of PST.
Understanding the -13h Gap: Vietnam vs CST
Vietnam runs on Indochina Time (ICT) at UTC+07:00. CST runs on Central Standard Time (CST) at UTC-06:00. That puts Vietnam 13 hours behind CST — a difference of -13h at the current offsets.
In practice, when it is 9:00 AM in Vietnam it is 8:00 PM in CST on the previous day. Midnight in Vietnam is 11:00 AM in CST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Vietnam to CST time conversion table
| Vietnam (ICT) | CST (CST) | Day |
|---|---|---|
| 12:00 AM | 11:00 AM | previous day |
| 6:00 AM | 5:00 PM | previous day |
| 7:00 AM | 6:00 PM | previous day |
| 8:00 AM | 7:00 PM | previous day |
| 9:00 AM | 8:00 PM | previous day |
| 12:00 PM | 11:00 PM | previous day |
| 3:00 PM | 2:00 AM | same day |
| 5:00 PM | 4:00 AM | same day |
| 6:00 PM | 5:00 AM | same day |
| 9:00 PM | 8:00 AM | same day |
Why people convert Vietnam to CST time
- Scheduling a call from Vietnam to CST: a 10:00 AM start in Vietnam lands at 9:00 PM in CST the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -13h gap: Vietnam and CST have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in CST is 8:00 PM in Vietnam.
- Keeping family and friends in sync: knowing that 8:00 PM in Vietnam is 7:00 AM in CST 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 -13h gap is not.
- With a -13h gap there is no shared 9-to-5 window, so alternate the early start: one week Vietnam takes the early slot, the next week CST does.
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 CST (Central Standard Time)
Central Standard Time (CST) covers the central region of North America. It is the second most populous time zone in the US, including major cities like Chicago, Houston, and Dallas. CST is also used in Mexico City and much of Central America including Guatemala, Honduras, El Salvador, and Costa Rica. During summer, most of the US and Canada switch to Central Daylight Time (CDT, UTC-05:00), while Mexico and Central American countries generally remain on CST.
Best time to call between Vietnam and CST
With a -13h offset there is no overlap inside a normal 9 AM – 5 PM day. CST opens at 9:00 AM CST, which is 8:00 PM in Vietnam, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
Vietnam and CST have no shared working hours because of the -13h gap. Teams need to alternate early starts or rely on asynchronous handovers.
Vietnam is 13 hours behind CST (ICT UTC+07:00 → CST UTC-06:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
Vietnam
Does not observe DST
CST
☀ Currently in DST
Standard: UTC-06:00 · DST: UTC-05:00
Clocks fall back on Sun, Nov 1, 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 CST?
Vietnam (ICT, UTC+07:00) is 13 hours behind CST (CST, UTC-06:00). The gap is currently -13h.
How do I convert Vietnam time to CST time?
Add -13h to Vietnam local time. For example, 9:00 AM in Vietnam is 8:00 PM in CST (previous day).
What time is it in CST right now?
CST uses CST at UTC-06:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -13h offset from Vietnam.
What is the best time to call CST from Vietnam?
There is no shared working-hours window because of the -13h gap. The closest option is 1:00 PM in Vietnam, which is 12:00 AM in CST.
Which is behind, Vietnam or CST?
Vietnam is 13 hours behind CST. When it is 12:00 PM in Vietnam it is 11:00 PM in CST.
Do Vietnam and CST use different time zones?
Vietnam (Vietnam) uses ICT at UTC+07:00, while CST uses CST at UTC-06:00. The IANA identifiers are Asia/Ho_Chi_Minh and America/Chicago.
Does daylight saving time affect the Vietnam–CST difference?
Neither zone observes daylight saving time, so the -13h offset between Vietnam and CST is fixed all year.
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 CST?
Sometimes. The -13h gap is large enough that 8:00 PM or later in Vietnam already falls on the in CST.
What is the time difference between Vietnam and CST?
CST is -13h from Vietnam.
What timezone is Vietnam in?
Vietnam operates on its local timezone.
What timezone is CST in?
CST operates on its local timezone.
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 CST timezone?
Major cities in the CST timezone include Chicago, Houston, Dallas, San Antonio, Mexico City, Austin, Winnipeg, Memphis.
What is the UTC offset for CST?
Central Standard Time (CST) is at UTC-06:00. During daylight saving time, it shifts to CDT.
What should I know about the CST timezone?
CST covers 20 US states fully or partially. Chicago and Houston are the two largest cities in the Central Time Zone.
When is it midnight in Vietnam, what time is it in CST?
When it is 12:00 AM (midnight) in Vietnam (ICT), it is -13h later in CST (CST).
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