What is the time difference between Chatham Islands and Sydney?

Sydney is 2 hours 45 minutes behind Chatham Islands. 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 Chatham Islands?

Between 12:45–18:00 in Chatham Islands, which is 10:00–15:15 in Sydney. That is the only stretch where both cities are inside a 09:00–18:00 day.

Does Chatham Islands observe daylight saving time?

Yes. Chatham Islands runs on UTC+12:45 in winter and UTC+13:45 in summer. The next change is on 2026-09-27, when clocks go forward by 60 minutes.

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 Chatham Islands, what time is it in Sydney?

It is 09:15 in Sydney, on the same calendar date. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.

Which time zones do Chatham Islands and Sydney use?

Chatham Islands uses Pacific/Chatham, currently UTC+12:45 (CHAST), 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 Chatham Islands time to Sydney time

Sydney is 2 hours 45 minutes behind Chatham Islands right now, so midday in Chatham Islands lands in the morning in Sydney.

Convert a time

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Date

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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

The whole day mapped across: read down the left for Chatham Islands, across for Sydney.

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

Daylight saving time

Chatham Islands and Sydney both observe daylight saving. Where their change dates differ, so does the gap between them for the weeks in between.

Chatham Islands

Observes daylight saving time

Standard: UTC+12:45
Daylight: UTC+13:45
Next change: 2026-09-27 +60m

Sydney

Observes daylight saving time

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

When you can actually talk

You have 5 hours 15 minutes of shared working time: 12:45–18:00 in Chatham Islands, which is 10:00–15:15 in Sydney.

Chatham Islands 12:45–18:00Sydney 10:00–15:15
Chatham Islands 11:45–12:45Sydney 09:00–10:00

Reference

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

	Chatham Islands	Sydney
IANA zone	Pacific/Chatham	Australia/Sydney
Abbreviation	CHAST	AEST
Standard offset	UTC+12:45	UTC+10
Daylight offset	UTC+13:45	UTC+11
Clock changes this year	2	2
Country	New Zealand	Australia

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

Common questions

What is the time difference between Chatham Islands and Sydney?: Sydney is 2 hours 45 minutes behind Chatham Islands. 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 Chatham Islands?: Between 12:45–18:00 in Chatham Islands, which is 10:00–15:15 in Sydney. That is the only stretch where both cities are inside a 09:00–18:00 day.
Does Chatham Islands observe daylight saving time?: Yes. Chatham Islands runs on UTC+12:45 in winter and UTC+13:45 in summer. The next change is on 2026-09-27, when clocks go forward by 60 minutes.
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 Chatham Islands, what time is it in Sydney?: It is 09:15 in Sydney, on the same calendar date. That holds for the current offsets; it shifts by an hour around the daylight saving dates listed above.
Which time zones do Chatham Islands and Sydney use?: Chatham Islands uses Pacific/Chatham, currently UTC+12:45 (CHAST), and Sydney uses Australia/Sydney, currently UTC+10 (AEST). Those identifiers are the ones to use in code — abbreviations are ambiguous and offsets change.