Does it account for Daylight Saving Time?

Yes, our converter uses the IANA timezone database, which includes all current DST rules for every timezone in the world.

UTC (Coordinated Universal Time) is the primary time standard by which the world regulates clocks. All timezones are defined as offsets from UTC.

Can I compare multiple timezones at once?

Yes, you can add multiple cities or timezones and see the equivalent times side by side.

How many timezones are there in the world?

There are 38 distinct UTC offsets in use, ranging from UTC-12 to UTC+14. This includes half-hour (UTC+5:30 India, UTC+9:30 Australia) and 45-minute offsets (UTC+5:45 Nepal, UTC+8:45 Australia).

What is the International Date Line?

The International Date Line (IDL) runs roughly along the 180° meridian in the Pacific Ocean. When you cross it westward, you gain a day; crossing eastward, you lose a day.

Why do some timezones have 30 or 45 minute offsets?

Countries chose offsets that best matched their solar noon. India uses UTC+5:30 and Nepal uses UTC+5:45 because standard hourly offsets didn't align well with their geography.

Which country has the most timezones?

France has the most (12 timezones) due to overseas territories. Russia spans 11 timezones. The US has 6 (including Hawaii and Alaska).

MST to Ho Chi Minh

+14h

MST

MSTSOURCE

UTC-06:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Ho Chi Minh

ICT

Vietnam · UTC+07:00

HH02

MM00

(next day)02:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

MST

Ho Chi Minh

12:00 AM

1:00 PM

2:00 AM

3:00 PM

4:00 AM

5:00 PM

6:00 AM

7:00 PM

8:00 AM

9:00 PM

10:00 AM

11:00 PM

12:00 PM

1:00 AM+1

2:00 PM

3:00 AM+1

4:00 PM

5:00 AM+1

6:00 PM

7:00 AM+1

8:00 PM

9:00 AM+1

10:00 PM

11:00 AM+1

Green 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 Zone

→

ICT Zone

Explore all world timezones interactively →

MST – Mountain Standard Time

UTC-07:00

Mountain Standard Time (MST) is the time zone for the Mountain region of North America, 7 hours behind UTC.

Countries in MST

United States (Mountain)Canada (Alberta)Mexico (Chihuahua, Sonora)

Major Cities in MST

DenverPhoenixSalt Lake CityCalgaryEdmontonAlbuquerqueEl PasoTucsonBoiseCiudad Juárez

Key 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.
•Denver, the 'Mile High City', is the largest city fully in MST.
•MST covers 6 US states entirely and parts of several others.

Daylight Saving:Yes – switches to MDT

Learn more about MST on Wikipedia

ICT – Indochina Time

UTC+07:00

Indochina Time (ICT) is the time zone for Vietnam, Thailand, Laos, and Cambodia, 7 hours ahead of UTC.

Countries in ICT

ThailandVietnamCambodiaLaosIndonesia (WIB)

Major Cities in ICT

BangkokHo Chi Minh CityHanoiJakartaPhnom PenhVientiane

Key Facts about ICT

•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.

Daylight Saving:No – UTC+07:00 year-round

Learn more about ICT on Wikipedia

About Ho Chi Minh

Wikipedia

Ho Chi Minh City operates on Indochina Time (ICT), UTC+7. As Vietnam's economic powerhouse and a manufacturing hub, Saigon drives Southeast Asian trade.

Population:9 million

Metro:13 million

Business Hours:8:00 AM - 5:00 PM ICT

Currency:VND (₫)

Stock Exchange:HOSE (Ho Chi Minh Stock Exchange)

Key Landmarks

Notre-Dame CathedralWar Remnants MuseumBen Thanh MarketIndependence PalaceCu Chi Tunnels

Did You Know?

The city has over 5 million motorbikes, outnumbering cars significantly.

Learn more about ICT timezone →

Comparing Time Zones: MST and Ho Chi Minh

MST runs on Mountain Standard Time (MST) at UTC-07:00. Ho Chi Minh runs on Indochina Time (ICT) at UTC+07:00. That puts MST 14 hours ahead of Ho Chi Minh — a difference of +14h at the current offsets.

In practice, when it is 9:00 AM in MST it is 11:00 PM in Ho Chi Minh. Midnight in MST is 2:00 PM in Ho Chi Minh. Neither zone observes daylight saving time, so the offset between them stays constant all year.

MST to Ho Chi Minh time conversion table

MST (MST)	Ho Chi Minh (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 Ho Chi Minh time

Scheduling a call from MST to Ho Chi Minh: a 10:00 AM start in MST lands at 12:00 AM in Ho Chi Minh the next day, so you can confirm the slot without doing the arithmetic yourself.
Handling a +14h gap: MST and Ho Chi Minh 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 Ho Chi Minh is 11:00 PM in MST.
Coordinating a MST-based team with Ho Chi Minh 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 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 Ho Chi Minh 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 Ho Chi Minh

With a +14h offset there is no overlap inside a normal 9 AM – 5 PM day. Ho Chi Minh 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 Ho Chi Minh 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 Ho Chi Minh (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

Ho Chi Minh

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:

⏳

History of Timekeeping

From sundials to atomic clocks - 5000 years of measuring time

🌍

How Time Zones Work

UTC, offsets, and why zones don't follow straight lines

☀️

Daylight Saving Time

DST dates, which countries observe it, and the ongoing debate

Frequently Asked Questions

What is the time difference between MST and Ho Chi Minh?

MST (MST, UTC-07:00) is 14 hours ahead of Ho Chi Minh (ICT, UTC+07:00). The gap is currently +14h.

How do I convert MST time to Ho Chi Minh time?

Add +14h to MST local time. For example, 9:00 AM in MST is 11:00 PM in Ho Chi Minh.

What time is it in Ho Chi Minh right now?

Ho Chi Minh 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 Ho Chi Minh 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 Ho Chi Minh.

Which is ahead, MST or Ho Chi Minh?

MST is 14 hours ahead of Ho Chi Minh. When it is 12:00 PM in MST it is 2:00 AM in Ho Chi Minh.

Do MST and Ho Chi Minh use different time zones?

MST uses MST at UTC-07:00, while Ho Chi Minh (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–Ho Chi Minh difference?

Neither zone observes daylight saving time, so the +14h offset between MST and Ho Chi Minh 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 Ho Chi Minh?

Sometimes. The +14h gap is large enough that 8:00 PM or later in MST already falls on the next day in Ho Chi Minh.

What is the time difference between MST and Ho Chi Minh?

Ho Chi Minh is +14h from MST.

What timezone is MST in?

MST operates on its local timezone.

What timezone is Ho Chi Minh in?

Ho Chi Minh City operates on Indochina Time (ICT), UTC+7. As Vietnam's economic powerhouse and a manufacturing hub, Saigon drives Southeast Asian trade.

What are the business hours in Ho Chi Minh?

Standard business hours in Ho Chi Minh are 8:00 AM - 5:00 PM ICT.

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.