Time Difference: Adelaide vs Honolulu
Adelaide
2:14:34 AM ACST
Monday, June 29, 2026
19h 30m
19h 30m
Honolulu
6:44:34 AM HST
Sunday, June 28, 2026
Honolulu is 19.5 hours behind Adelaide.
Quick Reference
- Adelaide
- ACST (GMT+9:30)
ACDT starts on Oct 3, 2026
- Honolulu
- HST (GMT-10)
No Daylight Saving Time
Frequently Asked Questions
- What is the time difference between Adelaide and Honolulu?
- Honolulu is 19.5 hours behind Adelaide.
- When is the best time to call from Adelaide to Honolulu?
- The best time to call is during overlapping business hours (9 AM – 5 PM) in both cities. Use the interactive converter on this page to visually compare hours side by side.
- Does the time difference change with daylight saving time?
- The time difference may change when either city enters or exits daylight saving time. Adelaide uses ACST and Honolulu uses HST.