HST → JST Converter
Hawaii's mid-Pacific position and large Japanese-American population create an active business and family pair, especially in tourism, real estate, and military operations. The one-day-rollover quirk catches many people off guard.
HST → JST
8:40 AM
Hawaii-Aleutian Standard Time (HST)
Thursday, June 11, 2026
UTC-10 (DST active)
3:40 AM
Japan Standard Time (GMT+9)
Friday, June 12, 2026
UTC+9 (DST active)
Time Zone Converter
HST·Honolulu
8:40 AM
Thursday, June 11, 2026
JST·Tokyo
3:40 AM
Friday, June 12, 2026
Compare Times
| HST | JST |
|---|
Morning
| HST | JST |
|---|---|
| 12:00 AM HST | 7:00 PM JST |
| 1:00 AM HST | 8:00 PM JST |
| 2:00 AM HST | 9:00 PM JST |
| 3:00 AM HST | 10:00 PM JST |
| 4:00 AM HST | 11:00 PM JST |
| 5:00 AM HST | 12:00 AM JST |
| 6:00 AM HST | 1:00 AM JST |
| 7:00 AM HST | 2:00 AM JST |
| 8:00 AM HST | 3:00 AM JST |
| 9:00 AM HST | 4:00 AM JST |
| 10:00 AM HST | 5:00 AM JST |
| 11:00 AM HST | 6:00 AM JST |
Afternoon
| HST | JST |
|---|---|
| 12:00 PM HST | 7:00 AM JST |
| 1:00 PM HST | 8:00 AM JST |
| 2:00 PM HST | 9:00 AM JST |
| 3:00 PM HST | 10:00 AM JST |
| 4:00 PM HST | 11:00 AM JST |
Evening
| HST | JST |
|---|---|
| 5:00 PM HST | 12:00 PM JST |
| 6:00 PM HST | 1:00 PM JST |
| 7:00 PM HST | 2:00 PM JST |
| 8:00 PM HST | 3:00 PM JST |
| 9:00 PM HST | 4:00 PM JST |
| 10:00 PM HST | 5:00 PM JST |
| 11:00 PM HST | 6:00 PM JST |
Frequently Asked Questions: HST to JST
What is the time difference between Hawaii Time and Japan Standard Time?
JST is 19 hours ahead of HST (standard time).
What time is midnight in HST in JST?
Midnight (12:00 AM) in Hawaii Time translates to 7:00 PM JST in Japan Standard Time.
When do business hours overlap between HST and JST?
The business hours overlap window is 13:00–16:00 HST (08:00–11:00 JST). The shared window is limited; aim for the earlier part of this range when possible. Japan is 19 hours ahead of Hawaii (or equivalently, Hawaii is 5 hours behind Japan with a one-day rollover). Constant year-round.
Common Time Conversions
EST · New York →
CST · Chicago →
MST · Denver →
PST · Los Angeles →
AKST · Anchorage →
HST · Honolulu →
UTC · Universal →
GMT · London →
IST · New Delhi →
CET · Paris →
How Time Zone Conversion Works
Time zone conversion works by comparing the UTC offset of one location to another. Every city or region is measured relative to Coordinated Universal Time (UTC), which acts as the global reference point for civil time.
JST is 19 hours ahead of HST (standard time).
Daylight Saving Time: Neither HST nor JST observes Daylight Saving Time. The 19-hour offset is constant year-round with no seasonal variation.
Best time to call Tokyo from Honolulu
Planning a remote meeting or international call? The optimal business hours overlap between Honolulu and Tokyo is moderate, with a limited shared window to work with.
Try Meeting Planner for multi-city group scheduling →HST
13:00–16:00
Hawaii Time
JST
08:00–11:00
Japan Time
Recommended time: 14:00 HST / 09:00 JST (next day)
Japan is 19 hours ahead of Hawaii (or equivalently, Hawaii is 5 hours behind Japan with a one-day rollover). Constant year-round.
DST schedule for 2026
Current-year daylight saving start and end dates for the selected zones.
HST · Hawaii Time
Standard offset −10:00
Hawaii Time remains on a constant standard offset for the year.
Hawaii does not observe DST. The Aleutian Islands portion of HAST does observe DST (becoming HADT, UTC−9), but population there is negligible. For practical purposes HST is a fixed-offset zone.
JST · Japan Time
Standard offset +09:00
Japan Time remains on a constant standard offset for the year.
Japan has not observed daylight saving time since 1951.
Principal Cities
HST — Hawaii Time
- HonoluluUnited States
- Pearl CityUnited States
- HiloUnited States
- KailuaUnited States
JST — Japan Time
- TokyoJapan
- YokohamaJapan
- OsakaJapan
- NagoyaJapan
Flight Information
Route
HNL ↔ NRT
Avg. flight time
9h
Direct flights
Available
Roughly 9-hour direct flight; Hawaii is the closest US state to Japan.