HST time now (Hawaii-Aleutian Standard Time)

What HST means

HST stands for Hawaii-Aleutian Standard Time, UTC−10. It is used in Hawaii (all year) and the western Aleutian Islands (in winter).

It is a standard (winter) time. Places on HST that observe daylight saving time switch to HDT (UTC−9) in summer, so HST is a fixed offset while the local clock is not.

Where and when HST is used

1 zone uses HST all year. 1 zone uses it for part of the year only, switching to daylight saving time in the other months. Computed from tzdata under the current rules.

How long HST has been used

In the tzdata record, Honolulu has used HST since 1896 and Adak has used HST since 1983. No zone has given up HST for good.

HST converted to other zones

Every column is a fixed offset, so this table is valid on any date. Remember that the regions behind some columns switch to summer time (EST to EDT, CET to CEST, GMT to BST); the clock in those cities is then an hour later than the column.

Related zones and conversions

• HDT time
• Pacific/Honolulu time zone
• UTC−10 time
• Time zones of the world
• Daylight saving time
• Time zone converter