HST to JST Converter
JST is 19 hours ahead of HST. 9:00 AM HST = 4:00 AM JST (next day).
JST is 19 hours ahead of HST. To convert HST to JST, add 19 hours to the HST time: 9:00 AM HST = 4:00 AM JST (next day).
HST (Hawaii-Aleutian Time) is used in Hawaii (all year, no daylight saving time). JST (Japan Time) is used in Japan.
HST to JST time conversion table
HST to JST on 6 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| HST | JST | Day |
|---|---|---|
| 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 | night |
| 4:00 AM HST | 11:00 PM JST | night |
| 5:00 AM HST | 12:00 AM JST | next day |
| 6:00 AM HST | 1:00 AM JST | next day |
| 7:00 AM HST | 2:00 AM JST | next day |
| 8:00 AM HST | 3:00 AM JST | next day |
| 9:00 AM HST | 4:00 AM JST | next day |
| 10:00 AM HST | 5:00 AM JST | next day |
| 11:00 AM HST | 6:00 AM JST | next day |
| 12:00 PM HST | 7:00 AM JST | next day |
| 1:00 PM HST | 8:00 AM JST | next day |
| 2:00 PM HST | 9:00 AM JST | work hours |
| 3:00 PM HST | 10:00 AM JST | work hours |
| 4:00 PM HST | 11:00 AM JST | work hours |
| 5:00 PM HST | 12:00 PM JST | next day |
| 6:00 PM HST | 1:00 PM JST | next day |
| 7:00 PM HST | 2:00 PM JST | next day |
| 8:00 PM HST | 3:00 PM JST | next day |
| 9:00 PM HST | 4:00 PM JST | next day |
| 10:00 PM HST | 5:00 PM JST | next day |
| 11:00 PM HST | 6:00 PM JST | next day |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert HST to JST
Add 19 hours to the HST time to get JST.
Example: 9:00 AM HST = 4:00 AM JST (next day).
Across midnight: 10:00 PM HST = 5:00 PM JST (next day). The date changes, so always check the day as well as the hour.
Time difference between HST and JST
The time difference between HST and JST is 19 hours all year – JST is ahead of HST.
HST and JST during daylight saving time
- HST does not observe daylight saving time; it stays on UTC−10 all year.
- JST does not observe daylight saving time; it stays on UTC+9 all year.
Best time for a meeting between HST and JST
HST and JST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 12:00 PM HST, which is 7:00 AM JST.
HST to JST FAQ
What is the time difference between HST and JST?
JST is 19 hours ahead of HST all year. 9:00 AM HST = 4:00 AM JST (next day).
What is 9 AM HST in JST?
9:00 AM HST is 4:00 AM JST (next day).
What is 12 PM (noon) HST in JST?
12:00 PM HST is 7:00 AM JST (next day).
Is JST ahead of or behind HST?
JST is 19 hours ahead of HST, so it is later in JST than in HST.
Does HST change for daylight saving time?
No. HST stays on the same offset all year, so conversions never shift for daylight saving time.
Does JST change for daylight saving time?
No. JST stays on the same offset all year, so conversions never shift for daylight saving time.
What is the best time for a meeting between HST and JST?
HST and JST have no shared 9 AM–5 PM window. The earliest slot that is reasonable on both sides is 12:00 PM HST, which is 7:00 AM JST.
Related conversions
Convert JST to HST
Convert HST to other time zones
Convert other time zones to JST
Learn more
Updated 6 November 2026. Time zone data: IANA tz database.