What is HST in UTC?
Coordinated Universal Time is 10 hours ahead
Hawaii Standard Time is on UTC−10:00 and Coordinated Universal Time is on UTC+0:00 right now. That gap holds all year, because both zones change their clocks together.
- Time in Honolulu
- 4:14 pm
- Time in the prime meridian
- 2:14 am
- Difference
- +10 h
- Next clock change
- Neither zone
Convert a time
UTC — Coordinated Universal Time
2:00 am
Wed, the next day
Daylight saving
Hawaii Standard Time
Hawaii Standard Time stays on HST all year, so its offset from UTC never moves.
Coordinated Universal Time
Coordinated Universal Time stays on UTC all year, so its offset from UTC never moves.
HST to UTC conversion table
Every hour of Tuesday, September 22, 2026, converted from Hawaii Standard Time to Coordinated Universal Time. 10 of the 24 hours fall on a different calendar day in the prime meridian, which is marked.
- 12:00 am HST
- 10:00 am UTC
- 1:00 am HST
- 11:00 am UTC
- 2:00 am HST
- 12:00 pm UTC
- 3:00 am HST
- 1:00 pm UTC
- 4:00 am HST
- 2:00 pm UTC
- 5:00 am HST
- 3:00 pm UTC
- 6:00 am HST
- 4:00 pm UTC
- 7:00 am HST
- 5:00 pm UTC
- 8:00 am HST
- 6:00 pm UTC
- 9:00 am HST
- 7:00 pm UTC
- 10:00 am HST
- 8:00 pm UTC
- 11:00 am HST
- 9:00 pm UTC
- 12:00 pm HST
- 10:00 pm UTC
- 1:00 pm HST
- 11:00 pm UTC
- 2:00 pm HST
- 12:00 am UTC+1 day
- 3:00 pm HST
- 1:00 am UTC+1 day
- 4:00 pm HST
- 2:00 am UTC+1 day
- 5:00 pm HST
- 3:00 am UTC+1 day
- 6:00 pm HST
- 4:00 am UTC+1 day
- 7:00 pm HST
- 5:00 am UTC+1 day
- 8:00 pm HST
- 6:00 am UTC+1 day
- 9:00 pm HST
- 7:00 am UTC+1 day
- 10:00 pm HST
- 8:00 am UTC+1 day
- 11:00 pm HST
- 9:00 am UTC+1 day
Scheduling between the two
There is no overlap between a nine-to-six working day in Honolulu and one in the prime meridian — the gap is too wide. A call has to sit early or late for one side. Early morning in Honolulu is the usual compromise, since that is late afternoon or evening in the prime meridian.
Hawaii Standard Time (HST) is used in all of Hawaii, which does not observe daylight saving
Coordinated Universal Time (UTC) is used in aviation, computing, and science worldwide. UTC never changes for daylight saving.