Costa Mesa to Sydney time converter

Sydney is 18 hours ahead of Costa Mesa. When it is 9:00 AM in Costa Mesa, it is 3:00 AM (Mon, Oct 19) in Sydney.

Costa Mesa PDT

Sunday, October 18, 2026

Sydney AEDT

Monday, October 19, 2026

Costa Mesa
California, United States
Sun, Oct 18
PDTUTC-7
Sydney
New South Wales, Australia
Mon, Oct 19
AEDTUTC+11+18h
Finding your time zone…
Shared working hours (9:00–18:00)

Costa Mesa to Sydney conversion table

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

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

Best time to call or meet

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

Daylight saving time and the difference

The difference changes during the year because Costa Mesa and Sydney switch clocks on different dates:

  • Oct 18, 2026 – Nov 1, 2026: +18h
  • Nov 1, 2026 – Mar 14, 2027: +19h
  • Mar 14, 2027 – Apr 3, 2027: +18h
  • Apr 3, 2027 – Oct 2, 2027: +17h
  • Oct 2, 2027 – Oct 18, 2027: +18h

Distance

Costa Mesa and Sydney are 12,078 km (7,505 miles) apart in a straight line.

More conversions

Sydney to Costa MesaCosta Mesa to New YorkCosta Mesa to LondonCosta Mesa to Los AngelesCosta Mesa to ChicagoCosta Mesa to TorontoCosta Mesa to São PauloCosta Mesa to ParisCosta Mesa to BerlinCosta Mesa to MoscowCosta Mesa to DubaiCosta Mesa to New DelhiCosta Mesa to Bangkok
New York to SydneyLondon to SydneyLos Angeles to SydneyChicago to SydneyToronto to SydneySão Paulo to SydneyParis to SydneyBerlin to SydneyMoscow to SydneyDubai to SydneyNew Delhi to SydneyBangkok to Sydney

Questions and answers

What is the time difference between Costa Mesa and Sydney?

Sydney is 18 hours ahead of Costa Mesa.

What time is it in Sydney when it is 9 AM in Costa Mesa?

When it is 9:00 AM in Costa Mesa, it is 3:00 AM (Mon, Oct 19) in Sydney.

When is the best time to call Sydney from Costa Mesa?

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

Does the time difference between Costa Mesa and Sydney change?

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