Cook Islands Standard Time is 21 hours behind Australian Eastern Daylight Time.

Frequently asked

Quick answers about converting between Cook Islands Standard Time and Australian Eastern Daylight Time. Can't find what you need? Email [email protected].

What is the time difference between Cook Islands Standard Time and Australian Eastern Daylight Time?

Cook Islands Standard Time is 21 hours behind Australian Eastern Daylight Time right now. We always show the live, daylight-saving-correct difference, so this figure already accounts for whichever side is observing summer time today.

When it's 9am in Cook Islands Standard Time, what time is it in Australian Eastern Daylight Time?

9am in Cook Islands Standard Time is 6am in Australian Eastern Daylight Time on the next day. Use the hour-by-hour table above to read any other time across — find the row and read the matching cell in the other column.

What's the best time for a call between Cook Islands Standard Time and Australian Eastern Daylight Time?

12pm–5pm in Cook Islands Standard Time lines up with 9am–2pm in Australian Eastern Daylight Time the next day — both sides are inside a 9-to-5 working day.

Does this account for daylight saving time?

Yes. We track every clock change in both places, so the abbreviations you see — -10:00 and AEDT — are the ones actually in effect right now, not a fixed all-year value. When either side changes its clocks, this page updates automatically.

Why is the date sometimes different on each side?

When two places are far enough apart, the same moment can fall on different calendar days. That is why some conversions are marked "previous day" or "next day" — it is the same instant in time, read off two clocks that crossed midnight at different points.