HST to ACST
Convert Hawaii Time — Honolulu to Australian Central Time — Adelaide — fast, accurate, and daylight-saving aware.
When it's 9:00 AM in Honolulu, it's 4:30 AM in Adelaide. Adelaide is 19½ hours ahead of Honolulu. Use the converter above to turn any HST time into ACST, or scan the hour-by-hour table below for the full day.
HST to ACST at a glance
Planning a meeting between Honolulu and Adelaide
Honolulu and Adelaide share no standard 9-to-5 overlap, so a live call usually means one side taking an early-morning or late-evening slot. The hourly table below helps you pick the least-inconvenient time for everyone.
Hour-by-hour: Honolulu to Adelaide
A full day mapped from HST to ACST.
Frequently asked
Is Adelaide ahead of or behind Honolulu?
Adelaide is 19½ hours ahead of Honolulu.
What is 12:00 PM HST in ACST?
12:00 PM in Honolulu is 7:30 AM in Adelaide.
Does this converter account for daylight saving time?
Yes. Conversions use the IANA time zone database, so HST and ACST automatically reflect the correct daylight-saving offset for the current date.