What is the time difference between Honolulu and Sydney?

Sydney is 20 hours ahead of Honolulu. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.

When is the best time to call Sydney from Honolulu?

Between 14:00–18:00 in Honolulu, which is 10:00–14:00 in Sydney. That is the only stretch where both cities are inside a 09:00–18:00 day.

Does Honolulu observe daylight saving time?

No. Honolulu stays on UTC-10 all year, so its clocks never move.

Does Sydney observe daylight saving time?

Yes. Sydney runs on UTC+10 in winter and UTC+11 in summer. The next change is on 2026-10-04, when clocks go forward by 60 minutes.

If it is midday in Honolulu, what time is it in Sydney?

It is 08:00 in Sydney, and already the following day. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.

Which time zones do Honolulu and Sydney use?

Honolulu uses Pacific/Honolulu, currently UTC-10 (HST), and Sydney uses Australia/Sydney, currently UTC+10 (AEST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.

Convert Honolulu time to Sydney time

Sydney is 20 hours ahead of Honolulu right now, so midday in Honolulu lands in the morning in Sydney.

Convert a time

From

Date

Time

Converted time

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The converter needs JavaScript to run. Everything below — offsets, daylight saving dates and the hour-by-hour table — is part of the page and works without it.

Hour by hour

Every hour of a day in Honolulu, and what the clock reads in Sydney at that same moment.

Honolulu	Sydney
00:00	20:00
01:00	21:00
02:00	22:00
03:00	23:00
04:00	00:00next day
05:00	01:00next day
06:00	02:00next day
07:00	03:00next day
08:00	04:00next day
09:00	05:00next day
10:00	06:00next day
11:00	07:00next day
12:00	08:00next day
13:00	09:00next day
14:00	10:00next day
15:00	11:00next day
16:00	12:00next day
17:00	13:00next day
18:00	14:00next day
19:00	15:00next day
20:00	16:00next day
21:00	17:00next day
22:00	18:00next day
23:00	19:00next day

Daylight saving time

Honolulu keeps one offset all year while Sydney moves twice. That is the whole reason this difference is seasonal.

Honolulu

Does not observe daylight saving time

Standard: UTC-10

Sydney

Observes daylight saving time

Standard: UTC+10
Daylight: UTC+11
Next change: 2026-10-04 +60m

When you can actually talk

The window is 4 hours wide — 14:00–18:00 in Honolulu, 10:00–14:00 in Sydney.

Honolulu 14:00–18:00Sydney 10:00–14:00
Honolulu 13:00–14:00Sydney 09:00–10:00

Reference

The underlying data, in case you need to put it in a calendar invitation or a configuration file.

	Honolulu	Sydney
IANA zone	Pacific/Honolulu	Australia/Sydney
Abbreviation	HST	AEST
Standard offset	UTC-10	UTC+10
Daylight offset	—	UTC+11
Clock changes this year	0	2
Country	United States	Australia

Example, not the current time. Live times appear once the page loads.

Common questions

What is the time difference between Honolulu and Sydney?: Sydney is 20 hours ahead of Honolulu. That figure is current — it changes by an hour when either city starts or ends daylight saving, and the exact dates are listed above.
When is the best time to call Sydney from Honolulu?: Between 14:00–18:00 in Honolulu, which is 10:00–14:00 in Sydney. That is the only stretch where both cities are inside a 09:00–18:00 day.
Does Honolulu observe daylight saving time?: No. Honolulu stays on UTC-10 all year, so its clocks never move.
Does Sydney observe daylight saving time?: Yes. Sydney runs on UTC+10 in winter and UTC+11 in summer. The next change is on 2026-10-04, when clocks go forward by 60 minutes.
If it is midday in Honolulu, what time is it in Sydney?: It is 08:00 in Sydney, and already the following day. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.
Which time zones do Honolulu and Sydney use?: Honolulu uses Pacific/Honolulu, currently UTC-10 (HST), and Sydney uses Australia/Sydney, currently UTC+10 (AEST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.