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.

Osaka to Honolulu

-19h

Osaka

JSTSOURCE

Japan · UTC+09:00

HH12

MM00

12:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Honolulu

HST

USA · UTC-10:00

HH05

MM00

(previous day)17:00 (24-hr)

12 AM6 AM12 PM6 PM12 AM

Quick Reference

Time Conversion Table

Osaka

Honolulu

12:00 AM

5:00 AM-1

2:00 AM

7:00 AM-1

4:00 AM

9:00 AM-1

6:00 AM

11:00 AM-1

8:00 AM

1:00 PM-1

10:00 AM

3:00 PM-1

12:00 PM

5:00 PM-1

2:00 PM

7:00 PM-1

4:00 PM

9:00 PM-1

6:00 PM

11:00 PM-1

8:00 PM

1:00 AM

10:00 PM

3:00 AM

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

JST and HST on the World Map

The map below highlights the JST (Japan Standard Time) and HST (Hawaii Standard Time) timezone regions across the globe.

JST Zone

→

HST Zone

Explore all world timezones interactively →

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

HST – Hawaii Standard Time

UTC-10:00

Hawaii Standard Time (HST) is the time zone for the Hawaiian Islands, 10 hours behind UTC.

Countries in HST

United States (Hawaii)

Major Cities in HST

HonoluluHiloKailuaPearl CityKapolei

Key Facts about HST

•Hawaii does not observe daylight saving time.
•HST is 5 hours behind EST in winter and 6 hours behind EDT in summer.
•Hawaii is one of only two US states that don't observe DST (the other is Arizona).

Daylight Saving:No – UTC-10:00 year-round

Learn more about HST on Wikipedia

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 →

About Honolulu

Wikipedia

Honolulu operates on Hawaii Standard Time (HST), UTC-10 with no daylight saving. Hawaii's consistent time makes it a predictable connection between Asia and mainland USA.

Population:350,000

Metro:1 million

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

Currency:USD ($)

Key Landmarks

Waikiki BeachDiamond HeadPearl HarborIolani PalaceHanauma Bay

Did You Know?

Pearl Harbor memorial receives over 2 million visitors annually.

Learn more about HST timezone →

Everything You Need to Know About Osaka and Honolulu Time

Osaka runs on Japan Standard Time (JST) at UTC+09:00. Honolulu runs on Hawaii-Aleutian Standard Time (HST) at UTC-10:00. That puts Osaka 19 hours behind Honolulu — a difference of -19h at the current offsets.

In practice, when it is 9:00 AM in Osaka it is 2:00 PM in Honolulu on the previous day. Midnight in Osaka is 5:00 AM in Honolulu. Neither zone observes daylight saving time, so the offset between them stays constant all year.

Osaka to Honolulu time conversion table

Osaka (JST)	Honolulu (HST)	Day
12:00 AM	5:00 AM	previous day
6:00 AM	11:00 AM	previous day
7:00 AM	12:00 PM	previous day
8:00 AM	1:00 PM	previous day
9:00 AM	2:00 PM	previous day
12:00 PM	5:00 PM	previous day
3:00 PM	8:00 PM	previous day
5:00 PM	10:00 PM	previous day
6:00 PM	11:00 PM	previous day
9:00 PM	2:00 AM	same day

Why people convert Osaka to Honolulu time

Scheduling a call from Osaka to Honolulu: a 10:00 AM start in Osaka lands at 3:00 PM in Honolulu the previous day, so you can confirm the slot without doing the arithmetic yourself.
Handling a -19h gap: Osaka and Honolulu 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 Honolulu is 2:00 PM in Osaka.
Booking travel or deliveries: tracking Honolulu local time against Osaka keeps pickup windows and arrival estimates honest across the -19h offset.

Always state the zone abbreviation, not just the hour. "3:00 PM JST" is unambiguous; "3 PM" across a -19h gap is not.
With a -19h gap there is no shared 9-to-5 window, so alternate the early start: one week Osaka takes the early slot, the next week Honolulu does.

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.

About HST (Hawaii Standard Time)

Hawaii Standard Time (HST) is used in the state of Hawaii and does not observe daylight saving time. This makes HST one of the most consistent time zones in the US. The Hawaiian Islands are among the last places on Earth to see a new calendar day.

Best time to call between Osaka and Honolulu

With a -19h offset there is no overlap inside a normal 9 AM – 5 PM day. Honolulu opens at 9:00 AM HST, which is 2:00 PM in Osaka, so real-time calls need an early-morning or late-evening slot on one side.

Business hours overlap

Osaka and Honolulu have no shared working hours because of the -19h gap. Teams need to alternate early starts or rely on asynchronous handovers.

Osaka is 19 hours behind Honolulu (JST UTC+09:00 → HST UTC-10:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.

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 Osaka and Honolulu?

Osaka (JST, UTC+09:00) is 19 hours behind Honolulu (HST, UTC-10:00). The gap is currently -19h.

How do I convert Osaka time to Honolulu time?

Add -19h to Osaka local time. For example, 9:00 AM in Osaka is 2:00 PM in Honolulu (previous day).

What time is it in Honolulu right now?

Honolulu uses HST at UTC-10:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -19h offset from Osaka.

What is the best time to call Honolulu from Osaka?

There is no shared working-hours window because of the -19h gap. The closest option is 1:00 PM in Osaka, which is 6:00 PM in Honolulu.

Which is behind, Osaka or Honolulu?

Osaka is 19 hours behind Honolulu. When it is 12:00 PM in Osaka it is 5:00 PM in Honolulu.

Do Osaka and Honolulu use different time zones?

Osaka (Japan) uses JST at UTC+09:00, while Honolulu (USA) uses HST at UTC-10:00. The IANA identifiers are Asia/Tokyo and Pacific/Honolulu.

Does daylight saving time affect the Osaka–Honolulu difference?

Neither zone observes daylight saving time, so the -19h offset between Osaka and Honolulu is fixed all year.

Which other cities share Osaka's time zone?

JST also covers Tokyo, Osaka, Yokohama, Nagoya, Sapporo, Kyoto, Kobe, Fukuoka and 1 more.

Which countries use JST, Osaka's zone?

JST is used in Japan.

Is there a day difference between Osaka and Honolulu?

Sometimes. The -19h gap is large enough that 8:00 PM or later in Osaka already falls on the in Honolulu.

What is the time difference between Osaka and Honolulu?

Honolulu is -19h from Osaka.

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 timezone is Honolulu in?

Honolulu operates on Hawaii Standard Time (HST), UTC-10 with no daylight saving. Hawaii's consistent time makes it a predictable connection between Asia and mainland USA.

What are the business hours in Osaka?

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

What are the business hours in Honolulu?

Standard business hours in Honolulu are 8:00 AM - 5:00 PM HST.

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

The best overlap for a call is when both cities are in business hours. Osaka works 9:00 AM - 6:00 PM JST and Honolulu works 8:00 AM - 5:00 PM HST (-19h difference). Try scheduling during the overlapping window for maximum convenience.

What currencies are used in Osaka and Honolulu?

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

How do Osaka and Honolulu compare in size?

Osaka has a population of approximately 2.8 million (metro: 19 million), while Honolulu has approximately 350,000 (metro: 1 million).

What are the major landmarks in Osaka and Honolulu?

Osaka is known for Osaka Castle, Dotonbori, Universal Studios Japan. Honolulu is famous for Waikiki Beach, Diamond Head, Pearl Harbor.

Do Osaka and Honolulu have stock exchanges?

Yes. Osaka has the OSE (Osaka Exchange - derivatives) and Honolulu has the N/A (Uses NYSE/NASDAQ). The -19h time difference affects trading hour overlaps between these exchanges.