The time difference between Hawaii and Sydney is 20 hours. When it is 12:00 noon in Hawaii, it is 08:00 in Sydney. Hawaii uses the Pacific/Honolulu time zone (UTC-10), while Sydney uses Australia/Sydney (UTC+10).
With a 20 hours gap, there is no standard business-hours overlap between Hawaii and Sydney. One party will need to adjust their schedule. Early mornings in Sydney or late evenings in Hawaii tend to be the most practical compromise.
Use this table to quickly convert any hour from Hawaii time to Sydney time. Rows highlighted in green indicate overlapping business hours in both cities.
| Hawaii | Sydney | |
|---|---|---|
| 00:00 | 20:00 | Night |
| 01:00 | 21:00 | Night |
| 02:00 | 22:00 | Night |
| 03:00 | 23:00 | Night |
| 04:00 | 00:00 (+1 day) | Night |
| 05:00 | 01:00 (+1 day) | Night |
| 06:00 | 02:00 (+1 day) | |
| 07:00 | 03:00 (+1 day) | |
| 08:00 | 04:00 (+1 day) | |
| 09:00 | 05:00 (+1 day) | |
| 10:00 | 06:00 (+1 day) | |
| 11:00 | 07:00 (+1 day) | |
| 12:00 | 08:00 (+1 day) | |
| 13:00 | 09:00 (+1 day) | Overlap |
| 14:00 | 10:00 (+1 day) | Overlap |
| 15:00 | 11:00 (+1 day) | Overlap |
| 16:00 | 12:00 (+1 day) | Overlap |
| 17:00 | 13:00 (+1 day) | |
| 18:00 | 14:00 (+1 day) | |
| 19:00 | 15:00 (+1 day) | |
| 20:00 | 16:00 (+1 day) | |
| 21:00 | 17:00 (+1 day) | |
| 22:00 | 18:00 (+1 day) | Night |
| 23:00 | 19:00 (+1 day) | Night |
Neither Hawaii nor Sydney is currently observing daylight saving time. If either city observes DST, the time difference will change by 1 hour when DST begins or ends. Always double-check before scheduling across these time zones during March–April and October–November.
The time difference is 20 hours. Sydney is 20 hours ahead of Hawaii.
It can. If either Hawaii or Sydney observes daylight saving time, the gap will shift by 1 hour during the transition periods (typically March–April and October–November).
There is no ideal window during standard business hours. Consider scheduling at the edges — early morning for the city that is ahead and late afternoon for the city that is behind.
Add 20 hours to Hawaii time to get Sydney time. Use the hour-by-hour table above for a quick reference.