HST — Hawaii Standard Time
Current time, offset and daylight saving status for Hawaii Standard Time.
Current time in HST
04:12:26
Hawaii Standard Time · UTC-10:00
About HST
Hawaii does not observe daylight saving time, so HST is used all year.
Working with HST
UTC-10:00 applies here on every date of the year — there is no summer offset for Hawaii Standard Time to switch to, so a time written against it means the same instant in January as in July.
When it is noon UTC, Hawaii Standard Time reads 02:00; midnight UTC is 14:00 here. HST runs 10 h behind UTC, so its calendar day begins after the reference clock’s does.
No other zone in this directory keeps UTC-10:00 as its standard offset. One hour to the east of HST in this directory sits AKST (UTC-09:00); no listed zone keeps the offset one hour to the west.
Clock changes in HST
Hawaii Standard Time has no clock change at any point in the year; UTC-10:00 applies on every date, in Honolulu as everywhere else on the zone.
Of the reference zones in the table below, New York, London, Berlin, Sydney and Los Angeles observe daylight saving, so their difference from HST shifts twice a year; UTC, Dubai, Kolkata, Singapore and Tokyo stay fixed.
Where HST is used
In this directory one city keeps HST: Honolulu. Between them they cover United States.
Where HST stands today
Hawaii Standard Time is UTC-10:00 today and will be UTC-10:00 on every other day. A recurring meeting anchored to HST never drifts against UTC, which makes it a dependable reference for logs kept in Honolulu and for schedules that run across a whole year.
A working day on HST
Taking Honolulu as the reference point for HST, and a working day as 09:00 to 17:00:
- New York overlaps for only 2 hours, from 09:00 to 11:00 Honolulu time — late in the day at one end and early at the other.
- London has no overlap at all: when it is 09:00 there, it is already 22:00 in Honolulu, so a call means an early start or a late finish for someone.
- Tokyo has no overlap at all: when it is 09:00 there, it is already 14:00 in Honolulu, so a call means an early start or a late finish for someone.
On the June solstice the sun rises in Honolulu at about 05:50 and sets at about 19:16; on the December solstice it rises at about 07:04 and sets at about 17:54.
How HST compares with other zones
Right now HST runs behind every reference zone in the table: UTC, New York, London, Berlin, Dubai, Kolkata, Singapore, Tokyo, Sydney and Los Angeles.
| Zone | UTC offset | Difference from HST |
|---|---|---|
| UTC | UTC+00:00 | 10h behind |
| New York | UTC-04:00 | 6h behind |
| London | UTC+01:00 | 11h behind |
| Berlin | UTC+02:00 | 12h behind |
| Dubai | UTC+04:00 | 14h behind |
| Kolkata | UTC+05:30 | 15h 30m behind |
| Singapore | UTC+08:00 | 18h behind |
| Tokyo | UTC+09:00 | 19h behind |
| Sydney | UTC+11:00 | 21h behind |
| Los Angeles | UTC-07:00 | 3h behind |
Larger places currently keeping HST: United States.
Cities using HST
Convert HST to another zone
Time zone rules: IANA tz database release 2026c, applied when this page was generated on 2026-10-09.
Frequently asked questions
What is HST?
Hawaii Standard Time, HST, is UTC-10:00. Hawaii does not observe daylight saving time, so HST is used all year.
What is the IANA identifier for HST?
Pacific/Honolulu — the entry that covers Honolulu in the tz database. Use it rather than HST in software: HST names one season, Pacific/Honolulu names the rules for every date.
Does HST change for daylight saving?
No. Hawaii Standard Time keeps UTC-10:00 on every date; no other listed zone keeps that offset.
How do I convert HST to my local time?
One hour to the east of HST in this directory sits AKST (UTC-09:00); no listed zone keeps the offset one hour to the west. For anything beyond that, the converter applies the rules of Pacific/Honolulu for the date you give it rather than a remembered figure.
Which cities use HST?
In this directory one city keeps HST: Honolulu. Between them they cover United States. The boundary is legal rather than geographic: it follows the borders of United States, not a line of longitude.
What should I put in a configuration file for HST?
Pacific/Honolulu, never HST. That entry carries the rules Honolulu actually follows, including when daylight saving starts and ends, so software using it stays correct through a change that a stored offset would miss.