JST to HST Converter & Meeting Planner
Quick answer: 9:00 AM JST = 2:00 PM HST (fixed +09:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Japan Standard Time (JST) and Hawaii-Aleutian Standard Time (HST)? You need to account for the standard time difference. Hawaii-Aleutian Standard Time is normally 19 hours behind Japan Standard Time. Whether you are coordinating between teams in Tokyo and Osaka and Honolulu and Hilo, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM JST = 5:00 AM HST. The full 24-hour JST to HST table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM JST = 8:00 PM HST (-1 day).
| JST Time | HST Time |
|---|---|
| 12:00 AM (00:00) | 5:00 AM (05:00)-1 day |
| 1:00 AM (01:00) | 6:00 AM (06:00)-1 day |
| 2:00 AM (02:00) | 7:00 AM (07:00)-1 day |
| 3:00 AM (03:00) | 8:00 AM (08:00)-1 day |
| 4:00 AM (04:00) | 9:00 AM (09:00)-1 day |
| 5:00 AM (05:00) | 10:00 AM (10:00)-1 day |
| 6:00 AM (06:00) | 11:00 AM (11:00)-1 day |
| 7:00 AM (07:00) | 12:00 PM (12:00)-1 day |
| 8:00 AM (08:00) | 1:00 PM (13:00)-1 day |
| 9:00 AM (09:00) | 2:00 PM (14:00)-1 day |
| 10:00 AM (10:00) | 3:00 PM (15:00)-1 day |
| 11:00 AM (11:00) | 4:00 PM (16:00)-1 day |
| 12:00 PM (12:00) | 5:00 PM (17:00)-1 day |
| 1:00 PM (13:00) | 6:00 PM (18:00)-1 day |
| 2:00 PM (14:00) | 7:00 PM (19:00)-1 day |
| 3:00 PM (15:00) | 8:00 PM (20:00)-1 day |
| 4:00 PM (16:00) | 9:00 PM (21:00)-1 day |
| 5:00 PM (17:00) | 10:00 PM (22:00)-1 day |
| 6:00 PM (18:00) | 11:00 PM (23:00)-1 day |
| 7:00 PM (19:00) | 12:00 AM (00:00) |
| 8:00 PM (20:00) | 1:00 AM (01:00) |
| 9:00 PM (21:00) | 2:00 AM (02:00) |
| 10:00 PM (22:00) | 3:00 AM (03:00) |
| 11:00 PM (23:00) | 4:00 AM (04:00) |
Best time to call Honolulu from Tokyo
For most work calls, compare the normal business day in Tokyo (JST) with the business day in Honolulu (HST). JST commonly covers East Asia, while HST is mainly associated with Pacific Ocean, North America.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
✅ The most practical overlap on 2026-07-05 is usually 9:00 AM - 12:00 PM JST, which corresponds to 2:00 PM - 5:00 PM HST. This window sits inside the typical JST workday (9:00 AM - 6:00 PM) and the HST workday (9:00 AM - 5:00 PM).
- DST Safety: JST or HST may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
- Tokyo Stock Exchange (TSE): 09:00-15:00 local time in Tokyo.
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Frequently Asked Questions
What is the time difference between JST and HST?
During standard time, Hawaii-Aleutian Standard Time is 19 hours behind Japan Standard Time.
Does Japan observe Daylight Saving Time?
Japan has not observed Daylight Saving Time since 1951, when the practice introduced during the Allied occupation was abolished by the Japanese government. JST has remained fixed at UTC+9:00 ever since, and there is no current legislation to reintroduce DST in Japan.
Is JST the same as Korean Standard Time (KST)?
Yes, South Korea's Korean Standard Time (KST) operates at the same UTC+9:00 offset as JST, and South Korea also does not observe Daylight Saving Time. The two countries share an identical clock year-round, which simplifies scheduling for the significant trade, technology, and cultural exchange between Tokyo and Seoul.
Does Hawaii observe Daylight Saving Time?
Hawaii does not observe Daylight Saving Time and has not done so since 1947, remaining fixed at UTC-10:00 year-round. At roughly 20° North latitude, Hawaii's daylight hours vary by only about 1.5 hours between the summer and winter solstices — far too little to justify the disruption of a seasonal clock change.
Why is it called Hawaii-Aleutian time?
The name combines two geographically distant US territories that share the same UTC-10:00 standard offset: the Hawaiian Islands in the central Pacific and the westernmost Aleutian Islands of Alaska, which extend past the 180° meridian into the Eastern Hemisphere. Despite sharing a base offset, they behave differently — Hawaii observes no DST, while the Aleutian communities such as Adak do advance to HDT (UTC-9) each summer.