Honolulu to Osaka
+19hHonolulu
HSTSOURCEOsaka
JSTGreen rows indicate typical business hours (9 AM - 5 PM)
HST and JST on the World Map
The map below highlights the HST (Hawaii Standard Time) and JST (Japan Standard Time) timezone regions across the globe.
HST – Hawaii Standard Time
UTC-10:00Hawaii Standard Time (HST) is the time zone for the Hawaiian Islands, 10 hours behind UTC.
- •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).
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 Honolulu
WikipediaHonolulu 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.
Pearl Harbor memorial receives over 2 million visitors annually.
About Osaka
WikipediaOsaka operates on Japan Standard Time (JST), UTC+9. As Japan's second economic center and a manufacturing hub, Osaka shares business hours with Tokyo.
Osaka Castle was originally built in 1583 and has been rebuilt several times.
Everything You Need to Know About Honolulu and Osaka Time
Honolulu runs on Hawaii-Aleutian Standard Time (HST) at UTC-10:00. Osaka runs on Japan Standard Time (JST) at UTC+09:00. That puts Honolulu 19 hours ahead of Osaka — a difference of +19h at the current offsets.
In practice, when it is 9:00 AM in Honolulu it is 4:00 AM in Osaka on the next day. Midnight in Honolulu is 7:00 PM in Osaka. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Honolulu to Osaka time conversion table
| Honolulu (HST) | Osaka (JST) | Day |
|---|---|---|
| 12:00 AM | 7:00 PM | same day |
| 6:00 AM | 1:00 AM | next day |
| 7:00 AM | 2:00 AM | next day |
| 8:00 AM | 3:00 AM | next day |
| 9:00 AM | 4:00 AM | next day |
| 12:00 PM | 7:00 AM | next day |
| 3:00 PM | 10:00 AM | next day |
| 5:00 PM | 12:00 PM | next day |
| 6:00 PM | 1:00 PM | next day |
| 9:00 PM | 4:00 PM | next day |
Why people convert Honolulu to Osaka time
- Scheduling a call from Honolulu to Osaka: a 10:00 AM start in Honolulu lands at 5:00 AM in Osaka the next day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +19h gap: Honolulu 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 4:00 AM in Honolulu.
- Watching a live event or market open: Honolulu viewers need 4:00 AM in Osaka to catch a 9:00 AM start there, and 5:00 AM if the event is anchored to Honolulu.
- Always state the zone abbreviation, not just the hour. "3:00 PM HST" 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 Honolulu takes the early slot, the next week Osaka does.
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.
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 Honolulu and Osaka
With a +19h offset there is no overlap inside a normal 9 AM – 5 PM day. Osaka opens at 9:00 AM JST, which is 4:00 AM in Honolulu, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
Honolulu and Osaka have no shared working hours because of the +19h gap. Teams need to alternate early starts or rely on asynchronous handovers.
Honolulu is 19 hours ahead of Osaka (HST UTC-10:00 → 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.
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 Honolulu and Osaka?
Honolulu (HST, UTC-10:00) is 19 hours ahead of Osaka (JST, UTC+09:00). The gap is currently +19h.
How do I convert Honolulu time to Osaka time?
Add +19h to Honolulu local time. For example, 9:00 AM in Honolulu is 4:00 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 +19h offset from Honolulu.
What is the best time to call Osaka from Honolulu?
There is no shared working-hours window because of the +19h gap. The closest option is 1:00 PM in Honolulu, which is 8:00 AM in Osaka.
Which is ahead, Honolulu or Osaka?
Honolulu is 19 hours ahead of Osaka. When it is 12:00 PM in Honolulu it is 7:00 AM in Osaka.
Do Honolulu and Osaka use different time zones?
Honolulu (USA) uses HST at UTC-10:00, while Osaka (Japan) uses JST at UTC+09:00. The IANA identifiers are Pacific/Honolulu and Asia/Tokyo.
Does daylight saving time affect the Honolulu–Osaka difference?
Neither zone observes daylight saving time, so the +19h offset between Honolulu and Osaka is fixed all year.
Which other cities share Honolulu's time zone?
HST also covers Honolulu, Hilo, Kailua, Pearl City, Kapolei.
Which countries use HST, Honolulu's zone?
HST is used in United States (Hawaii).
Is there a day difference between Honolulu and Osaka?
Sometimes. The +19h gap is large enough that 8:00 PM or later in Honolulu already falls on the next day in Osaka.
What is the time difference between Honolulu and Osaka?
Osaka is +19h from Honolulu.
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 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 Honolulu?
Standard business hours in Honolulu are 8:00 AM - 5:00 PM HST.
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 Honolulu and Osaka?
The best overlap for a call is when both cities are in business hours. Honolulu works 8:00 AM - 5:00 PM HST and Osaka works 9:00 AM - 6:00 PM JST (+19h difference). Try scheduling during the overlapping window for maximum convenience.
What currencies are used in Honolulu and Osaka?
Honolulu uses USD ($) while Osaka uses JPY (¥). Check current exchange rates when planning travel or business between these cities.
How do Honolulu and Osaka compare in size?
Honolulu has a population of approximately 350,000 (metro: 1 million), while Osaka has approximately 2.8 million (metro: 19 million).
What are the major landmarks in Honolulu and Osaka?
Honolulu is known for Waikiki Beach, Diamond Head, Pearl Harbor. Osaka is famous for Osaka Castle, Dotonbori, Universal Studios Japan.
Do Honolulu and Osaka have stock exchanges?
Yes. Honolulu has the N/A (Uses NYSE/NASDAQ) and Osaka has the OSE (Osaka Exchange - derivatives). The +19h time difference affects trading hour overlaps between these exchanges.
Which countries use HST (Hawaii Standard Time)?
HST is used in United States (Hawaii).
Does HST observe daylight saving time?
No, HST does not observe daylight saving time and remains at UTC-10:00 year-round.
What are some interesting 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.
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 Honolulu, what time is it in Osaka?
When it is 12:00 AM (midnight) in Honolulu (HST), it is +19h later in Osaka (JST).
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