What is KST in HST?
Hawaii Standard Time is 19 hours behind
Korea Standard Time is on UTC+9:00 and Hawaii Standard Time is on UTC−10:00 right now. That gap holds all year, because both zones change their clocks together.
- Time in Seoul
- 11:14 am
- Time in Honolulu
- 4:14 pm
- Difference
- −19 h
- Next clock change
- Neither zone
Convert a time
HST — Hawaii Standard Time
4:00 pm
Tue, the previous day
Daylight saving
Korea Standard Time
Korea Standard Time stays on KST all year, so its offset from UTC never moves.
Hawaii Standard Time
Hawaii Standard Time stays on HST all year, so its offset from UTC never moves.
KST to HST conversion table
Every hour of Wednesday, September 23, 2026, converted from Korea Standard Time to Hawaii Standard Time. 19 of the 24 hours fall on a different calendar day in Honolulu, which is marked.
- 12:00 am KST
- 5:00 am HST−1 day
- 1:00 am KST
- 6:00 am HST−1 day
- 2:00 am KST
- 7:00 am HST−1 day
- 3:00 am KST
- 8:00 am HST−1 day
- 4:00 am KST
- 9:00 am HST−1 day
- 5:00 am KST
- 10:00 am HST−1 day
- 6:00 am KST
- 11:00 am HST−1 day
- 7:00 am KST
- 12:00 pm HST−1 day
- 8:00 am KST
- 1:00 pm HST−1 day
- 9:00 am KST
- 2:00 pm HST−1 day
- 10:00 am KST
- 3:00 pm HST−1 day
- 11:00 am KST
- 4:00 pm HST−1 day
- 12:00 pm KST
- 5:00 pm HST−1 day
- 1:00 pm KST
- 6:00 pm HST−1 day
- 2:00 pm KST
- 7:00 pm HST−1 day
- 3:00 pm KST
- 8:00 pm HST−1 day
- 4:00 pm KST
- 9:00 pm HST−1 day
- 5:00 pm KST
- 10:00 pm HST−1 day
- 6:00 pm KST
- 11:00 pm HST−1 day
- 7:00 pm KST
- 12:00 am HST
- 8:00 pm KST
- 1:00 am HST
- 9:00 pm KST
- 2:00 am HST
- 10:00 pm KST
- 3:00 am HST
- 11:00 pm KST
- 4:00 am HST
Scheduling between the two
Working hours overlap from 9:00 am to 1:00 pm KST, which is 2:00 pm to 6:00 pm HST. Anything inside that window falls in the normal working day at both ends.
Hawaii Standard Time (HST) is used in all of Hawaii, which does not observe daylight saving