Sydney to Costa Mesa time converter

Costa Mesa is 18 hours behind Sydney. When it is 9:00 AM in Sydney, it is 3:00 PM (Sun, Oct 18) in Costa Mesa.

Sydney AEDT

Monday, October 19, 2026

Costa Mesa PDT

Monday, October 19, 2026

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

Sydney to Costa Mesa conversion table

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

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

Best time to call or meet

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

Daylight saving time and the difference

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

  • Oct 19, 2026 – Nov 1, 2026: -18h
  • Nov 1, 2026 – Mar 14, 2027: -19h
  • Mar 14, 2027 – Apr 4, 2027: -18h
  • Apr 4, 2027 – Oct 3, 2027: -17h
  • Oct 3, 2027 – Oct 19, 2027: -18h

Distance

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

More conversions

Costa Mesa 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 Costa MesaLondon to Costa MesaLos Angeles to Costa MesaChicago to Costa MesaToronto to Costa MesaSão Paulo to Costa MesaParis to Costa MesaBerlin to Costa MesaMoscow to Costa MesaDubai to Costa MesaNew Delhi to Costa MesaBangkok to Costa Mesa

Questions and answers

What is the time difference between Sydney and Costa Mesa?

Costa Mesa is 18 hours behind Sydney.

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

When it is 9:00 AM in Sydney, it is 3:00 PM (Sun, Oct 18) in Costa Mesa.

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

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

Does the time difference between Sydney and Costa Mesa change?

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