MST to Tokyo
+16hMST
MSTSOURCETokyo
JSTGreen rows indicate typical business hours (9 AM - 5 PM)
MST and JST on the World Map
The map below highlights the MST (Mountain Standard Time) and JST (Japan Standard 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.
JST – Japan Standard Time
UTC+09:00Japan Standard Time (JST) is the time zone for Japan, 9 hours ahead of UTC.
- •Japan does not observe daylight saving time.
- •Tokyo is the most populous metropolitan area in the world.
- •The Tokyo Stock Exchange operates from 9:00 AM to 3:00 PM JST.
- •JST is 14 hours ahead of EST and 9 hours ahead of GMT.
About Tokyo
WikipediaTokyo operates on Japan Standard Time (JST), which is 14 hours ahead of New York. As Asia's largest financial hub, Tokyo trading hours are crucial for global markets.
The Tokyo subway system moves approximately 8.7 million passengers daily.
MST vs Tokyo: Offsets, DST and Best Call Times
MST runs on Mountain Standard Time (MST) at UTC-07:00. Tokyo runs on Japan Standard Time (JST) at UTC+09:00. That puts MST 16 hours ahead of Tokyo — a difference of +16h at the current offsets.
In practice, when it is 9:00 AM in MST it is 1:00 AM in Tokyo on the next day. Midnight in MST is 4:00 PM in Tokyo. Neither zone observes daylight saving time, so the offset between them stays constant all year.
MST to Tokyo time conversion table
| MST (MST) | Tokyo (JST) | Day |
|---|---|---|
| 12:00 AM | 4:00 PM | same day |
| 6:00 AM | 10:00 PM | same day |
| 7:00 AM | 11:00 PM | same day |
| 8:00 AM | 12:00 AM | next day |
| 9:00 AM | 1:00 AM | next day |
| 12:00 PM | 4:00 AM | next day |
| 3:00 PM | 7:00 AM | next day |
| 5:00 PM | 9:00 AM | next day |
| 6:00 PM | 10:00 AM | next day |
| 9:00 PM | 1:00 PM | next day |
Why people convert MST to Tokyo time
- Scheduling a call from MST to Tokyo: a 10:00 AM start in MST lands at 2:00 AM in Tokyo the next day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +16h gap: MST and Tokyo 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 Tokyo is 1:00 AM in MST.
- Coordinating a MST-based team with Tokyo 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 +16h gap is not.
- With a +16h gap there is no shared 9-to-5 window, so alternate the early start: one week MST takes the early slot, the next week Tokyo 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 JST (Japan Standard Time)
Japan Standard Time (JST) is the standard time zone for all of Japan. Japan does not observe daylight saving time. JST is 9 hours ahead of UTC and 14 hours ahead of EST. The Tokyo Stock Exchange, the world's third largest by market capitalization, operates on JST. South Korea uses the same offset (KST) but it is a distinct time zone.
Best time to call between MST and Tokyo
With a +16h offset there is no overlap inside a normal 9 AM – 5 PM day. Tokyo opens at 9:00 AM JST, which is 1:00 AM in MST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
MST and Tokyo have no shared working hours because of the +16h gap. Teams need to alternate early starts or rely on asynchronous handovers.
MST is 16 hours ahead of Tokyo (MST UTC-07:00 → JST UTC+09:00). 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
Tokyo
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 Tokyo?
MST (MST, UTC-07:00) is 16 hours ahead of Tokyo (JST, UTC+09:00). The gap is currently +16h.
How do I convert MST time to Tokyo time?
Add +16h to MST local time. For example, 9:00 AM in MST is 1:00 AM in Tokyo (next day).
What time is it in Tokyo right now?
Tokyo uses JST at UTC+09:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +16h offset from MST.
What is the best time to call Tokyo from MST?
There is no shared working-hours window because of the +16h gap. The closest option is 1:00 PM in MST, which is 5:00 AM in Tokyo.
Which is ahead, MST or Tokyo?
MST is 16 hours ahead of Tokyo. When it is 12:00 PM in MST it is 4:00 AM in Tokyo.
Do MST and Tokyo use different time zones?
MST uses MST at UTC-07:00, while Tokyo (Japan) uses JST at UTC+09:00. The IANA identifiers are America/Denver and Asia/Tokyo.
Does daylight saving time affect the MST–Tokyo difference?
Neither zone observes daylight saving time, so the +16h offset between MST and Tokyo 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 Tokyo?
Sometimes. The +16h gap is large enough that 8:00 PM or later in MST already falls on the next day in Tokyo.
What is the time difference between MST and Tokyo?
Tokyo is +16h from MST.
What timezone is MST in?
MST operates on its local timezone.
What timezone is Tokyo in?
Tokyo operates on Japan Standard Time (JST), which is 14 hours ahead of New York. As Asia's largest financial hub, Tokyo trading hours are crucial for global markets.
What are the business hours in Tokyo?
Standard business hours in Tokyo are 9:00 AM - 6:00 PM JST.
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 JST timezone?
Major cities in the JST timezone include Tokyo, Osaka, Yokohama, Nagoya, Sapporo, Kyoto, Kobe, Fukuoka.
What is the UTC offset for JST?
Japan Standard Time (JST) is at UTC+09:00.
What should I know about the JST timezone?
Japan does not observe daylight saving time. Tokyo is the most populous metropolitan area in the world.
When is it midnight in MST, what time is it in Tokyo?
When it is 12:00 AM (midnight) in MST (MST), it is +16h later in Tokyo (JST).
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