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.

Denver to Osaka

+15h

Denver

MDTSOURCE

USA · UTC-06:00☀ DST active

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Osaka

JST

Japan · UTC+09:00

HH03

MM00

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

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Denver

Osaka

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 Standard Time) and JST (Japan Standard Time) timezone regions across the globe.

MDT Zone

→

JST 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

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 Denver

Wikipedia

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.

Population:715,000

Metro:2.9 million

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

Currency:USD ($)

Key Landmarks

Red Rocks AmphitheatreDenver Art MuseumUnion Station16th Street MallColorado State Capitol

Did You Know?

Denver International Airport is the largest airport in North America by land area.

Learn more about MDT timezone →

About Osaka

Wikipedia

Osaka operates on Japan Standard Time (JST), UTC+9. As Japan's second economic center and a manufacturing hub, Osaka shares business hours with Tokyo.

Population:2.8 million

Metro:19 million

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

Currency:JPY (¥)

Stock Exchange:OSE (Osaka Exchange - derivatives)

Key Landmarks

Osaka CastleDotonboriUniversal Studios JapanShitennoji TempleUmeda Sky Building

Did You Know?

Osaka Castle was originally built in 1583 and has been rebuilt several times.

Learn more about JST timezone →

Everything You Need to Know About Denver and Osaka Time

Denver runs on Mountain Daylight Time (MDT) at UTC-06:00, currently observing daylight saving time. Osaka runs on Japan Standard Time (JST) at UTC+09:00. That puts Denver 15 hours ahead of Osaka — a difference of +15h at the current offsets.

In practice, when it is 9:00 AM in Denver it is 12:00 AM in Osaka on the next day. Midnight in Denver is 3:00 PM in Osaka.Denver observes daylight saving time while Osaka does not, so the gap narrows or widens by an hour part of the year.

Denver to Osaka time conversion table

Denver (MDT)	Osaka (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 Denver to Osaka time

Scheduling a call from Denver to Osaka: a 10:00 AM start in Denver lands at 1:00 AM in Osaka the next day, so you can confirm the slot without doing the arithmetic yourself.
Handling a +15h gap: Denver and Osaka 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 Osaka is 12:00 AM in Denver.
Booking travel or deliveries: tracking Osaka local time against Denver 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 Denver takes the early slot, the next week Osaka does.
Denver: Clocks fall back on Sun, Nov 1, 2026. Re-check this page after that date because the offset changes and so does the +15h gap.

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 Denver and Osaka

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

Business hours overlap

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

Denver is 15 hours ahead of Osaka (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

Denver

☀ Currently in DST

Standard: UTC-07:00 · DST: UTC-06:00

Clocks fall back on Sun, Nov 1, 2026

Osaka

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 Denver and Osaka?

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

How do I convert Denver time to Osaka time?

Add +15h to Denver local time. For example, 9:00 AM in Denver is 12:00 AM in Osaka (next day).

What time is it in Osaka right now?

Osaka 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 Denver.

What is the best time to call Osaka from Denver?

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

Which is ahead, Denver or Osaka?

Denver is 15 hours ahead of Osaka. When it is 12:00 PM in Denver it is 3:00 AM in Osaka.

Do Denver and Osaka use different time zones?

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

Does daylight saving time affect the Denver–Osaka difference?

Yes at the moment: Denver is on daylight saving time and Osaka is not, so the +15h gap shifts by an hour when exactly one of them changes clocks.

Which other cities share Denver's time zone?

MDT also covers Denver, Phoenix, Salt Lake City, Calgary, Edmonton, Albuquerque, El Paso, Tucson and 2 more.

Which countries use MDT, Denver's zone?

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

Is there a day difference between Denver and Osaka?

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

What is the time difference between Denver and Osaka?

Osaka is +15h from Denver.

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 timezone is Osaka in?

Osaka operates on Japan Standard Time (JST), UTC+9. As Japan's second economic center and a manufacturing hub, Osaka shares business hours with Tokyo.

What are the business hours in Denver?

Standard business hours in Denver are 8:00 AM - 5:00 PM MST.

What are the business hours in Osaka?

Standard business hours in Osaka are 9:00 AM - 6:00 PM JST.

What is the best time to schedule a call between Denver and Osaka?

The best overlap for a call is when both cities are in business hours. Denver works 8:00 AM - 5:00 PM MST and Osaka works 9:00 AM - 6:00 PM JST (+15h difference). Try scheduling during the overlapping window for maximum convenience.

What currencies are used in Denver and Osaka?

Denver uses USD ($) while Osaka uses JPY (¥). Check current exchange rates when planning travel or business between these cities.

How do Denver and Osaka compare in size?

Denver has a population of approximately 715,000 (metro: 2.9 million), while Osaka has approximately 2.8 million (metro: 19 million).

What are the major landmarks in Denver and Osaka?

Denver is known for Red Rocks Amphitheatre, Denver Art Museum, Union Station. Osaka is famous for Osaka Castle, Dotonbori, Universal Studios Japan.

Do Denver and Osaka have stock exchanges?

Yes. Denver has the N/A (Uses NYSE/NASDAQ) and Osaka has the OSE (Osaka Exchange - derivatives). The +15h time difference affects trading hour overlaps between these exchanges.

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.