Sydney to Cook Islands time converter

Cook Islands is 21 hours behind Sydney. When it is 9:00 AM in Sydney, it is 12:00 PM (Mon, Oct 19) in Cook Islands.

Sydney AEDT

Tuesday, October 20, 2026

Cook Islands UTC-10

Monday, October 19, 2026

Sydney
New South Wales, Australia
Tue, Oct 20
AEDTUTC+11
Cook Islands
Mon, Oct 19
UTC-10-21h
Finding your time zone…
Shared working hours (9:00–18:00)

Sydney to Cook Islands conversion table

Every hour of today in Sydney and the matching time in Cook Islands. Light rows are typical working hours (9:00–18:00).

SydneyCook Islands
12:00 AM3:00 AM−1 day
1:00 AM4:00 AM−1 day
2:00 AM5:00 AM−1 day
3:00 AM6:00 AM−1 day
4:00 AM7:00 AM−1 day
5:00 AM8:00 AM−1 day
6:00 AM9:00 AM−1 day
7:00 AM10:00 AM−1 day
8:00 AM11:00 AM−1 day
9:00 AM12:00 PM−1 day
10:00 AM1:00 PM−1 day
11:00 AM2:00 PM−1 day
12:00 PM3:00 PM−1 day
1:00 PM4:00 PM−1 day
2:00 PM5:00 PM−1 day
3:00 PM6:00 PM−1 day
4:00 PM7:00 PM−1 day
5:00 PM8:00 PM−1 day
6:00 PM9:00 PM−1 day
7:00 PM10:00 PM−1 day
8:00 PM11:00 PM−1 day
9:00 PM12:00 AM
10:00 PM1:00 AM
11:00 PM2:00 AM

Best time to call or meet

Both sides are at work from 9:00 AM – 3:00 PM in Sydney (12:00 PM – 6:00 PM in Cook Islands).

Daylight saving time and the difference

The difference changes during the year because Sydney and Cook Islands switch clocks on different dates:

  • Oct 20, 2026 – Apr 4, 2027: -21h
  • Apr 4, 2027 – Oct 3, 2027: -20h
  • Oct 3, 2027 – Oct 20, 2027: -21h

More conversions

Cook Islands to SydneySydney to New YorkSydney to LondonSydney to Los AngelesSydney to ChicagoSydney to TorontoSydney to São PauloSydney to ParisSydney to BerlinSydney to MoscowSydney to DubaiSydney to New DelhiSydney to Bangkok
New York to Cook IslandsLondon to Cook IslandsLos Angeles to Cook IslandsChicago to Cook IslandsToronto to Cook IslandsSão Paulo to Cook IslandsParis to Cook IslandsBerlin to Cook IslandsMoscow to Cook IslandsDubai to Cook IslandsNew Delhi to Cook IslandsBangkok to Cook Islands

Questions and answers

What is the time difference between Sydney and Cook Islands?

Cook Islands is 21 hours behind Sydney.

What time is it in Cook Islands when it is 9 AM in Sydney?

When it is 9:00 AM in Sydney, it is 12:00 PM (Mon, Oct 19) in Cook Islands.

When is the best time to call Cook Islands from Sydney?

Both sides are at work from 9:00 AM – 3:00 PM in Sydney (12:00 PM – 6:00 PM in Cook Islands).

Does the time difference between Sydney and Cook Islands change?

Yes, for part of the year, because daylight saving time starts and ends on different dates or applies on one side only.