Time Difference Between Hawaii and Sydney

The time difference between Hawaii and Sydney is 21 hours. When it is 12:00 noon in Hawaii, it is 09:00 in Sydney. Hawaii uses the Pacific/Honolulu time zone (UTC-10), while Sydney uses Australia/Sydney (UTC+11).

Time Zone Details: Hawaii vs Sydney

Best Time to Schedule a Call

With a 21 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.

Hour-by-Hour Time Conversion

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.

Daylight Saving Time (DST) Impact

Sydney is currently observing daylight saving time, while Hawaii is on standard time. When Sydney switches back to standard time, the difference between these two cities will shift by 1 hour.

Practical Tips for Hawaii–Sydney Scheduling

• Video calls: Rotate call times between early-morning and late-evening slots to share the scheduling burden fairly.
• Email and async work: Send messages at the end of your workday so they arrive at the start of theirs. With a 21 hours offset, replies will often land by your next morning.
• Flight arrivals: A direct flight between these cities can cross 21 time zones. Factor in jet lag recovery — most travelers need roughly one day per hour of time difference to fully adjust.
• Use UTC as a neutral reference when coordinating with three or more time zones at once.

Frequently Asked Questions

What is the time difference between Hawaii and Sydney?

The time difference is 21 hours. Sydney is 21 hours ahead of Hawaii.

Does the time difference change during the year?

Yes. One of these cities observes DST while the other does not, so the difference shifts by 1 hour when DST begins or ends.

When is the best time to call from Hawaii to Sydney?

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.

How do I convert Hawaii time to Sydney time?

Add 21 hours to Hawaii time to get Sydney time. Use the hour-by-hour table above for a quick reference.

Related Pages

• Time Difference Calculator — compare any two cities
• Current Time Lookup — search any city worldwide
• All World Time Zones
• Current UTC Time