Vietnam to Denver
-13hVietnam
ICTSOURCEDenver
MDTGreen rows indicate typical business hours (9 AM - 5 PM)
ICT and MDT on the World Map
The map below highlights the ICT (Indochina Time) and MDT (Mountain 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.
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.
About Denver
WikipediaDenver operates on Mountain Time (MST/MDT), 2 hours behind New York. As a tech and aerospace hub, Denver bridges West Coast and Central US business hours.
Denver International Airport is the largest airport in North America by land area.
Understanding the -13h Gap: Vietnam vs Denver
Vietnam runs on Indochina Time (ICT) at UTC+07:00. Denver runs on Mountain Daylight Time (MDT) at UTC-06:00, also currently on daylight saving time. That puts Vietnam 13 hours behind Denver — a difference of -13h at the current offsets.
In practice, when it is 9:00 AM in Vietnam it is 8:00 PM in Denver on the previous day. Midnight in Vietnam is 11:00 AM in Denver.Denver observes daylight saving time while Vietnam does not, so the gap narrows or widens by an hour part of the year.
Vietnam to Denver time conversion table
| Vietnam (ICT) | Denver (MDT) | 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 Denver time
- Scheduling a call from Vietnam to Denver: a 10:00 AM start in Vietnam lands at 9:00 PM in Denver the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -13h gap: Vietnam and Denver 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 Denver is 8:00 PM in Vietnam.
- Keeping family and friends in sync: knowing that 8:00 PM in Vietnam is 7:00 AM in Denver 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 Denver does.
- Denver: Clocks fall back on Sun, Nov 1, 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 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).
Best time to call between Vietnam and Denver
With a -13h offset there is no overlap inside a normal 9 AM – 5 PM day. Denver opens at 9:00 AM MDT, 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 Denver 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 Denver (ICT UTC+07:00 → MDT 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
Denver
☀ Currently in DST
Standard: UTC-07:00 · DST: UTC-06:00
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 Denver?
Vietnam (ICT, UTC+07:00) is 13 hours behind Denver (MDT, UTC-06:00). The gap is currently -13h.
How do I convert Vietnam time to Denver time?
Add -13h to Vietnam local time. For example, 9:00 AM in Vietnam is 8:00 PM in Denver (previous day).
What time is it in Denver right now?
Denver uses MDT 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 Denver 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 Denver.
Which is behind, Vietnam or Denver?
Vietnam is 13 hours behind Denver. When it is 12:00 PM in Vietnam it is 11:00 PM in Denver.
Do Vietnam and Denver use different time zones?
Vietnam (Vietnam) uses ICT at UTC+07:00, while Denver (USA) uses MDT at UTC-06:00. The IANA identifiers are Asia/Ho_Chi_Minh and America/Denver.
Does daylight saving time affect the Vietnam–Denver difference?
Yes at the moment: Denver is on daylight saving time and Vietnam is not, so the -13h 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 Denver?
Sometimes. The -13h gap is large enough that 8:00 PM or later in Vietnam already falls on the in Denver.
What is the time difference between Vietnam and Denver?
Denver is -13h from Vietnam.
What timezone is Vietnam in?
Vietnam operates on its local timezone.
What timezone is Denver in?
Denver operates on Mountain Time (MST/MDT), 2 hours behind New York. As a tech and aerospace hub, Denver bridges West Coast and Central US business hours.
What are the business hours in Denver?
Standard business hours in Denver are 8:00 AM - 5:00 PM MST.
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 MST timezone?
Major cities in the MST timezone include Denver, Phoenix, Salt Lake City, Calgary, Edmonton, Albuquerque, El Paso, Tucson.
What is the UTC offset for MST?
Mountain Standard Time (MST) is at UTC-07:00. During daylight saving time, it shifts to MDT.
What should I know about the MST timezone?
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.
When is it midnight in Vietnam, what time is it in Denver?
When it is 12:00 AM (midnight) in Vietnam (ICT), it is -13h later in Denver (MST).
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