MST to Vietnam
+14hMST
MSTSOURCEVietnam
ICTGreen rows indicate typical business hours (9 AM - 5 PM)
MST and ICT on the World Map
The map below highlights the MST (Mountain Standard Time) and ICT (Indochina Time) timezone regions across the globe.
MST – Mountain Standard Time
UTC-07:00Mountain Standard Time (MST) is the time zone for the Mountain region of North America, 7 hours behind UTC.
- •Arizona does not observe daylight saving time, staying on MST year-round.
- •The Navajo Nation in Arizona does observe DST, unlike the rest of the state.
- •Denver, the 'Mile High City', is the largest city fully in MST.
- •MST covers 6 US states entirely and parts of several others.
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.
Time Conversion Guide: MST to Vietnam
MST runs on Mountain Standard Time (MST) at UTC-07:00. Vietnam runs on Indochina Time (ICT) at UTC+07:00. That puts MST 14 hours ahead of Vietnam — a difference of +14h at the current offsets.
In practice, when it is 9:00 AM in MST it is 11:00 PM in Vietnam. Midnight in MST is 2:00 PM in Vietnam. Neither zone observes daylight saving time, so the offset between them stays constant all year.
MST to Vietnam time conversion table
| MST (MST) | Vietnam (ICT) | Day |
|---|---|---|
| 12:00 AM | 2:00 PM | same day |
| 6:00 AM | 8:00 PM | same day |
| 7:00 AM | 9:00 PM | same day |
| 8:00 AM | 10:00 PM | same day |
| 9:00 AM | 11:00 PM | same day |
| 12:00 PM | 2:00 AM | next day |
| 3:00 PM | 5:00 AM | next day |
| 5:00 PM | 7:00 AM | next day |
| 6:00 PM | 8:00 AM | next day |
| 9:00 PM | 11:00 AM | next day |
Why people convert MST to Vietnam time
- Scheduling a call from MST to Vietnam: a 10:00 AM start in MST lands at 12:00 AM in Vietnam the next day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +14h gap: MST and Vietnam 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 Vietnam is 11:00 PM in MST.
- Keeping family and friends in sync: knowing that 8:00 PM in MST is 10:00 AM in Vietnam makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM MST" is unambiguous; "3 PM" across a +14h gap is not.
- With a +14h gap there is no shared 9-to-5 window, so alternate the early start: one week MST takes the early slot, the next week Vietnam does.
About MST (Mountain Standard Time)
Mountain Standard Time (MST) covers the Rocky Mountain region of the United States and Canada. Arizona is notable for not observing daylight saving time, staying on MST year-round (except the Navajo Nation). The time zone includes major cities like Denver, Phoenix, Calgary, and Salt Lake City. During summer, most areas switch to Mountain Daylight Time (MDT, UTC-06:00).
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 MST and Vietnam
With a +14h offset there is no overlap inside a normal 9 AM – 5 PM day. Vietnam opens at 9:00 AM ICT, which is 11:00 PM in MST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
MST and Vietnam have no shared working hours because of the +14h gap. Teams need to alternate early starts or rely on asynchronous handovers.
MST is 14 hours ahead of Vietnam (MST UTC-07:00 → ICT UTC+07:00). 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
MST
☀ Currently in DST
Standard: UTC-07:00 · DST: UTC-06:00
Clocks fall back on Sun, Nov 1, 2026
Vietnam
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 MST and Vietnam?
MST (MST, UTC-07:00) is 14 hours ahead of Vietnam (ICT, UTC+07:00). The gap is currently +14h.
How do I convert MST time to Vietnam time?
Add +14h to MST local time. For example, 9:00 AM in MST is 11:00 PM 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 +14h offset from MST.
What is the best time to call Vietnam from MST?
There is no shared working-hours window because of the +14h gap. The closest option is 1:00 PM in MST, which is 3:00 AM in Vietnam.
Which is ahead, MST or Vietnam?
MST is 14 hours ahead of Vietnam. When it is 12:00 PM in MST it is 2:00 AM in Vietnam.
Do MST and Vietnam use different time zones?
MST uses MST at UTC-07:00, while Vietnam (Vietnam) uses ICT at UTC+07:00. The IANA identifiers are America/Denver and Asia/Ho_Chi_Minh.
Does daylight saving time affect the MST–Vietnam difference?
Neither zone observes daylight saving time, so the +14h offset between MST and Vietnam is fixed all year.
Which other cities share MST's time zone?
MST also covers Denver, Phoenix, Salt Lake City, Calgary, Edmonton, Albuquerque, El Paso, Tucson and 2 more.
Which countries use MST, MST's zone?
MST is used in United States (Mountain), Canada (Alberta), Mexico (Chihuahua, Sonora).
Is there a day difference between MST and Vietnam?
Sometimes. The +14h gap is large enough that 8:00 PM or later in MST already falls on the next day in Vietnam.
What is the time difference between MST and Vietnam?
Vietnam is +14h from MST.
What timezone is MST in?
MST operates on its local timezone.
What timezone is Vietnam in?
Vietnam operates on its local timezone.
Which countries use MST (Mountain Standard Time)?
MST is used in United States (Mountain), Canada (Alberta), Mexico (Chihuahua, Sonora).
Does MST observe daylight saving time?
Yes, MST switches to MDT during summer months.
What are some interesting facts about MST?
Arizona does not observe daylight saving time, staying on MST year-round. The Navajo Nation in Arizona does observe DST, unlike the rest of the state.
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 MST, what time is it in Vietnam?
When it is 12:00 AM (midnight) in MST (MST), it is +14h later in Vietnam (ICT).
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