Does it handle Daylight Saving Time?

Yes, the tool automatically adjusts for Daylight Saving Time based on the specific date you select, ensuring accurate conversions year-round.

Can I add multiple cities?

Yes, you can add as many cities as you need to the dashboard to compare times across your entire global network simultaneously.

MDT to Tokyo

+15h

MDT

MDTSOURCE

UTC-06:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Tokyo

JST

Japan · UTC+09:00

HH03

MM00

(next day)03:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

MDT

Tokyo

12:00 AM

3:00 PM

2:00 AM

5:00 PM

4:00 AM

7:00 PM

6:00 AM

9:00 PM

8:00 AM

11:00 PM

10:00 AM

1:00 AM+1

12:00 PM

3:00 AM+1

2:00 PM

5:00 AM+1

4:00 PM

7:00 AM+1

6:00 PM

9:00 AM+1

8:00 PM

11:00 AM+1

10:00 PM

1:00 PM+1

Green rows indicate typical business hours (9 AM - 5 PM)

MDT and JST on the World Map

The map below highlights the MDT (Mountain Daylight Time) and JST (Japan Standard Time) timezone regions across the globe.

MDT Zone

→

JST Zone

Explore all world timezones interactively →

MDT – Mountain Daylight Time

UTC-06:00

Mountain Daylight Time (MDT) is the daylight saving offset in the Mountain Time Zone, 6 hours behind UTC.

Countries in MDT

United States (Mountain)Canada (Alberta)

Major Cities in MDT

DenverCalgaryEdmontonSalt Lake CityBoise

Key Facts about MDT

•MDT shares the same offset as CST (UTC-06:00).
•Arizona does not switch to MDT, remaining on MST.

Daylight Saving:Yes – switches to MST

Learn more about MDT on Wikipedia

JST – Japan Standard Time

UTC+09:00

Japan Standard Time (JST) is the time zone for Japan, 9 hours ahead of UTC.

Countries in JST

Japan

Major Cities in JST

TokyoOsakaYokohamaNagoyaSapporoKyotoKobeFukuokaHiroshima

Key Facts about JST

•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.

Daylight Saving:No – UTC+09:00 year-round

Learn more about JST on Wikipedia

About Tokyo

Wikipedia

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.

Population:14 million

Metro:37.4 million

Business Hours:9:00 AM - 6:00 PM JST

Currency:JPY (¥)

Stock Exchange:TSE (Tokyo Stock Exchange)

Key Landmarks

Tokyo TowerShibuya CrossingSenso-ji TempleImperial PalaceTokyo Skytree

Did You Know?

The Tokyo subway system moves approximately 8.7 million passengers daily.

Learn more about JST timezone →

Comparing Time Zones: MDT and Tokyo

MDT runs on Mountain Daylight Time (MDT) at UTC-06:00. Tokyo runs on Japan Standard Time (JST) at UTC+09:00. That puts MDT 15 hours ahead of Tokyo — a difference of +15h at the current offsets.

In practice, when it is 9:00 AM in MDT it is 12:00 AM in Tokyo on the next day. Midnight in MDT is 3:00 PM in Tokyo. Neither zone observes daylight saving time, so the offset between them stays constant all year.

MDT to Tokyo time conversion table

MDT (MDT)	Tokyo (JST)	Day
12:00 AM	3:00 PM	same day
6:00 AM	9:00 PM	same day
7:00 AM	10:00 PM	same day
8:00 AM	11:00 PM	same day
9:00 AM	12:00 AM	next day
12:00 PM	3:00 AM	next day
3:00 PM	6:00 AM	next day
5:00 PM	8:00 AM	next day
6:00 PM	9:00 AM	next day
9:00 PM	12:00 PM	next day

Why people convert MDT to Tokyo time

Scheduling a call from MDT to Tokyo: a 10:00 AM start in MDT lands at 1:00 AM in Tokyo the next day, so you can confirm the slot without doing the arithmetic yourself.
Handling a +15h gap: MDT 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 12:00 AM in MDT.
Booking travel or deliveries: tracking Tokyo local time against MDT keeps pickup windows and arrival estimates honest across the +15h offset.

Always state the zone abbreviation, not just the hour. "3:00 PM MDT" is unambiguous; "3 PM" across a +15h gap is not.
With a +15h gap there is no shared 9-to-5 window, so alternate the early start: one week MDT takes the early slot, the next week Tokyo does.

About MDT (Mountain Daylight Time)

Mountain Daylight Time (MDT) is observed during summer months in the Mountain Time Zone, except in Arizona which stays on MST year-round. MDT aligns with Central Standard Time (CST) at 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 MDT and Tokyo

With a +15h offset there is no overlap inside a normal 9 AM – 5 PM day. Tokyo opens at 9:00 AM JST, which is 12:00 AM in MDT, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

MDT and Tokyo have no shared working hours because of the +15h gap. Teams need to alternate early starts or rely on asynchronous handovers.

MDT is 15 hours ahead of Tokyo (MDT UTC-06:00 → 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

MDT

☀ 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:

⏳

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 MDT and Tokyo?

MDT (MDT, UTC-06:00) is 15 hours ahead of Tokyo (JST, UTC+09:00). The gap is currently +15h.

How do I convert MDT time to Tokyo time?

Add +15h to MDT local time. For example, 9:00 AM in MDT is 12:00 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 +15h offset from MDT.

What is the best time to call Tokyo from MDT?

There is no shared working-hours window because of the +15h gap. The closest option is 1:00 PM in MDT, which is 4:00 AM in Tokyo.

Which is ahead, MDT or Tokyo?

MDT is 15 hours ahead of Tokyo. When it is 12:00 PM in MDT it is 3:00 AM in Tokyo.

Do MDT and Tokyo use different time zones?

MDT uses MDT at UTC-06:00, while Tokyo (Japan) uses JST at UTC+09:00. The IANA identifiers are America/Denver and Asia/Tokyo.

Does daylight saving time affect the MDT–Tokyo difference?

Neither zone observes daylight saving time, so the +15h offset between MDT and Tokyo is fixed all year.

Which other cities share MDT's time zone?

MDT also covers Denver, Calgary, Edmonton, Salt Lake City, Boise.

Which countries use MDT, MDT's zone?

MDT is used in United States (Mountain), Canada (Alberta).

Is there a day difference between MDT and Tokyo?

Sometimes. The +15h gap is large enough that 8:00 PM or later in MDT already falls on the next day in Tokyo.

What is the time difference between MDT and Tokyo?

Tokyo is +15h from MDT.

What timezone is MDT in?

MDT 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.