What is UTC in HST?
Hawaii Standard Time is 10 hours behind
Coordinated Universal Time is on UTC+0:00 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 the prime meridian
- 1:34 am
- Time in Honolulu
- 3:34 pm
- Difference
- −10 h
- Next clock change
- Neither zone
Convert a time
HST — Hawaii Standard Time
3:00 pm
Tue, the previous day
Daylight saving
Coordinated Universal Time
Coordinated Universal Time stays on UTC 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.
UTC to HST conversion table
Every hour of Wednesday, September 23, 2026, converted from Coordinated Universal Time to Hawaii Standard Time. 10 of the 24 hours fall on a different calendar day in Honolulu, which is marked.
- 12:00 am UTC
- 2:00 pm HST−1 day
- 1:00 am UTC
- 3:00 pm HST−1 day
- 2:00 am UTC
- 4:00 pm HST−1 day
- 3:00 am UTC
- 5:00 pm HST−1 day
- 4:00 am UTC
- 6:00 pm HST−1 day
- 5:00 am UTC
- 7:00 pm HST−1 day
- 6:00 am UTC
- 8:00 pm HST−1 day
- 7:00 am UTC
- 9:00 pm HST−1 day
- 8:00 am UTC
- 10:00 pm HST−1 day
- 9:00 am UTC
- 11:00 pm HST−1 day
- 10:00 am UTC
- 12:00 am HST
- 11:00 am UTC
- 1:00 am HST
- 12:00 pm UTC
- 2:00 am HST
- 1:00 pm UTC
- 3:00 am HST
- 2:00 pm UTC
- 4:00 am HST
- 3:00 pm UTC
- 5:00 am HST
- 4:00 pm UTC
- 6:00 am HST
- 5:00 pm UTC
- 7:00 am HST
- 6:00 pm UTC
- 8:00 am HST
- 7:00 pm UTC
- 9:00 am HST
- 8:00 pm UTC
- 10:00 am HST
- 9:00 pm UTC
- 11:00 am HST
- 10:00 pm UTC
- 12:00 pm HST
- 11:00 pm UTC
- 1:00 pm HST
Scheduling between the two
There is no overlap between a nine-to-six working day in the prime meridian and one in Honolulu — the gap is too wide. A call has to sit early or late for one side. Early morning in the prime meridian is the usual compromise, since that is late afternoon or evening in Honolulu.
Coordinated Universal Time (UTC) is used in aviation, computing, and science worldwide. UTC never changes for daylight saving.
Hawaii Standard Time (HST) is used in all of Hawaii, which does not observe daylight saving