HST to KST Converter
KST is 19 hours ahead of HST. 9:00 AM HST = 4:00 AM KST (next day).
KST is 19 hours ahead of HST. To convert HST to KST, add 19 hours to the HST time: 9:00 AM HST = 4:00 AM KST (next day).
HST (Hawaii-Aleutian Time) is used in Hawaii (all year, no daylight saving time). KST (Korea Time) is used in South Korea.
HST to KST time conversion table
HST to KST on 6 Nov 2026. Today's date. Highlighted rows are 9 AM–5 PM in both places.
| HST | KST | Day |
|---|---|---|
| 12:00 AM HST | 7:00 PM KST | — |
| 1:00 AM HST | 8:00 PM KST | — |
| 2:00 AM HST | 9:00 PM KST | — |
| 3:00 AM HST | 10:00 PM KST | night |
| 4:00 AM HST | 11:00 PM KST | night |
| 5:00 AM HST | 12:00 AM KST | next day |
| 6:00 AM HST | 1:00 AM KST | next day |
| 7:00 AM HST | 2:00 AM KST | next day |
| 8:00 AM HST | 3:00 AM KST | next day |
| 9:00 AM HST | 4:00 AM KST | next day |
| 10:00 AM HST | 5:00 AM KST | next day |
| 11:00 AM HST | 6:00 AM KST | next day |
| 12:00 PM HST | 7:00 AM KST | next day |
| 1:00 PM HST | 8:00 AM KST | next day |
| 2:00 PM HST | 9:00 AM KST | work hours |
| 3:00 PM HST | 10:00 AM KST | work hours |
| 4:00 PM HST | 11:00 AM KST | work hours |
| 5:00 PM HST | 12:00 PM KST | next day |
| 6:00 PM HST | 1:00 PM KST | next day |
| 7:00 PM HST | 2:00 PM KST | next day |
| 8:00 PM HST | 3:00 PM KST | next day |
| 9:00 PM HST | 4:00 PM KST | next day |
| 10:00 PM HST | 5:00 PM KST | next day |
| 11:00 PM HST | 6:00 PM KST | next day |
- Work rows — 9 AM–5 PM in both places
- Night in the destination (10 PM–6 AM)
How to convert HST to KST
Add 19 hours to the HST time to get KST.
Example: 9:00 AM HST = 4:00 AM KST (next day).
Across midnight: 10:00 PM HST = 5:00 PM KST (next day). The date changes, so always check the day as well as the hour.
Time difference between HST and KST
The time difference between HST and KST is 19 hours all year – KST is ahead of HST.
HST and KST during daylight saving time
- HST does not observe daylight saving time; it stays on UTC−10 all year.
- KST does not observe daylight saving time; it stays on UTC+9 all year.
Best time for a meeting between HST and KST
HST and KST 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 KST.
HST to KST FAQ
What is the time difference between HST and KST?
KST is 19 hours ahead of HST all year. 9:00 AM HST = 4:00 AM KST (next day).
What is 9 AM HST in KST?
9:00 AM HST is 4:00 AM KST (next day).
What is 12 PM (noon) HST in KST?
12:00 PM HST is 7:00 AM KST (next day).
Is KST ahead of or behind HST?
KST is 19 hours ahead of HST, so it is later in KST 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 KST change for daylight saving time?
No. KST 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 KST?
HST and KST 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 KST.
Related conversions
Convert KST to HST
Convert HST to other time zones
Convert other time zones to KST
Learn more
Updated 6 November 2026. Time zone data: IANA tz database.