HST (Hawaii-Aleutian Standard Time) is UTC−10, all year. It is used in Honolulu.
Who uses HST
| IANA time zone | Uses HST | Main cities |
|---|---|---|
| Pacific/Honolulu | All year | Honolulu |
Convert HST to other time zones
HST is a fixed offset, so these conversions do not change with the seasons. What changes is which abbreviation a region is using on a given date.
| Zone | UTC offset | When it is 12:00 HST |
|---|---|---|
| UTC | UTC+0 | 10:00 PM |
| GMT | UTC+0 | 10:00 PM |
| EST | UTC−5 | 5:00 PM |
| EDT | UTC−4 | 6:00 PM |
| CST | UTC−6 | 4:00 PM |
| MST | UTC−7 | 3:00 PM |
| PST | UTC−8 | 2:00 PM |
| CET | UTC+1 | 11:00 PM |
| CEST | UTC+2 | 12:00 AM (next day) |
| EET | UTC+2 | 12:00 AM (next day) |
| MSK | UTC+3 | 1:00 AM (next day) |
| GST | UTC+4 | 2:00 AM (next day) |
| IST | UTC+5:30 | 3:30 AM (next day) |
| ICT | UTC+7 | 5:00 AM (next day) |
| JST | UTC+9 | 7:00 AM (next day) |
| AEST | UTC+10 | 8:00 AM (next day) |
| AEDT | UTC+11 | 9:00 AM (next day) |
Plan around the time in HST
- Convert a time to or from HST: pick a date and time and see it in every city on your list.
- Add Honolulu to your world clock to keep it next to your own time.
- Find a meeting time that falls inside office hours in HST and the other cities you work with.
- Open a full-screen clock for your own time zone.
Frequently asked questions
What is HST in UTC?
HST is UTC−10. To get UTC, add 10 hours to HST time.
What time is 12:00 HST in UTC?
12:00 HST is 10:00 PM UTC.
Time zone rules: IANA tz database, version 2026e. Place names and coordinates: GeoNames. Sunrise and sunset are calculated from the coordinates and can differ by a minute or two from local almanacs.