KST to HST: KST is 19 hours ahead of HST
Korea Standard Time is 19 hours ahead of Hawaii Standard Time, on every day of the year. It is 7:09 pm KST in Korea and 12:09 am HST in Hawaii.
Convert a specific time from KST to HST
Pick any time and date to convert it both ways. The conversion runs in your browser against the real zone rules, so a date inside a daylight saving period gets that period's offset rather than today's.
What is the time difference between KST and HST?
Hawaii Standard Time is 19 hours behind Korea Standard Time. To go from KST to HST you subtract 19 hours. That gap holds on all 365 days of 2026: neither zone moves its clocks.
KST to HST conversion table
Every hour of Friday, September 25, 2026 in Korea, with the matching reading in Hawaii. 19 of the 24 hours land on a different calendar date in Hawaii, which is the part people get wrong when they schedule across this pair.
| KST | KST 24h | HST | HST 24h | Date |
|---|---|---|---|---|
| 12:00 am | 00:00 | 5:00 am | 05:00 | the previous day |
| 1:00 am | 01:00 | 6:00 am | 06:00 | the previous day |
| 2:00 am | 02:00 | 7:00 am | 07:00 | the previous day |
| 3:00 am | 03:00 | 8:00 am | 08:00 | the previous day |
| 4:00 am | 04:00 | 9:00 am | 09:00 | the previous day |
| 5:00 am | 05:00 | 10:00 am | 10:00 | the previous day |
| 6:00 am | 06:00 | 11:00 am | 11:00 | the previous day |
| 7:00 am | 07:00 | 12:00 pm | 12:00 | the previous day |
| 8:00 am | 08:00 | 1:00 pm | 13:00 | the previous day |
| 9:00 am | 09:00 | 2:00 pm | 14:00 | the previous day |
| 10:00 am | 10:00 | 3:00 pm | 15:00 | the previous day |
| 11:00 am | 11:00 | 4:00 pm | 16:00 | the previous day |
| 12:00 pm | 12:00 | 5:00 pm | 17:00 | the previous day |
| 1:00 pm | 13:00 | 6:00 pm | 18:00 | the previous day |
| 2:00 pm | 14:00 | 7:00 pm | 19:00 | the previous day |
| 3:00 pm | 15:00 | 8:00 pm | 20:00 | the previous day |
| 4:00 pm | 16:00 | 9:00 pm | 21:00 | the previous day |
| 5:00 pm | 17:00 | 10:00 pm | 22:00 | the previous day |
| 6:00 pm | 18:00 | 11:00 pm | 23:00 | the previous day |
| 7:00 pm | 19:00 | 12:00 am | 00:00 | same day |
| 8:00 pm | 20:00 | 1:00 am | 01:00 | same day |
| 9:00 pm | 21:00 | 2:00 am | 02:00 | same day |
| 10:00 pm | 22:00 | 3:00 am | 03:00 | same day |
| 11:00 pm | 23:00 | 4:00 am | 04:00 | same day |
What are the best hours to schedule a call between KST and HST?
No hour of the standard 9:00 am to 5:00 pm working day falls inside working hours on both sides. Korea and Hawaii are 19 hours apart, which is too far for an overlap, so somebody has to take a call outside their own working day. The least painful options are below, ranked by how close both sides sit to the middle of the afternoon.
| KST | HST | Working hours | Note |
|---|---|---|---|
| 8:00 am | 1:00 pm the previous day | HST only | mid morning in Korea, afternoon in Hawaii |
| 9:00 am | 2:00 pm the previous day | both sides | mid morning in Korea, afternoon in Hawaii |
| 10:00 am | 3:00 pm the previous day | both sides | mid morning in Korea, afternoon in Hawaii |
Does daylight saving change KST to HST?
Korea Standard Time does not move its clocks at all, so its UTC+9 offset holds every day of the year.
Hawaii Standard Time does not move its clocks at all, so its UTC-10 offset holds every day of the year.
Is KST ahead of or behind HST?
KST is ahead of HST by 19 hours: when it is 12:00 pm in Korea, it is 5:00 pm the previous day in Hawaii. Neither Korea Standard Time nor Hawaii Standard Time observes daylight saving, so the abbreviations never change and the gap between them is fixed.
Korea Standard Time covers Seoul and South Korea. Hawaii Standard Time covers Hawaii, which has never moved its clocks. The identifiers behind them are Asia/Seoul and Pacific/Honolulu, which is what any calendar or scheduling system should be storing rather than a fixed number of hours.
Questions
- What is KST in HST?
- KST is 19 hours ahead of HST. 9:00 am KST is 2:00 pm the previous day HST.
- How many hours ahead is HST of KST?
- HST is 19 hours behind KST.
- What time is it in Hawaii right now?
- 12:09 am HST on Friday, September 25, 2026.
- When can Korea and Hawaii meet during working hours?
- There is no shared working hour. The closest fit is 8:00 am KST, which is 1:00 pm HST.
- Does this account for daylight saving?
- Yes. Every reading is computed from the IANA database for the actual date, so KST and HST are the abbreviations genuinely in force today rather than a fixed assumption.
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