Time Difference: Adelaide vs Honolulu
Honolulu is 20.5 hours behind Adelaide.
Quick Reference
- Adelaide
- ACDT (GMT+10:30)
ACST starts on Apr 4, 2026
- Honolulu
- HST (GMT-10)
No Daylight Saving Time
Frequently Asked Questions
- What is the time difference between Adelaide and Honolulu?
- Honolulu is 20.5 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 ACDT and Honolulu uses HST.