Honolulu to Costa Mesa time converter

Costa Mesa is 3 hours ahead of Honolulu. When it is 9:00 AM in Honolulu, it is 12:00 PM in Costa Mesa.

Honolulu HST

Monday, October 19, 2026

Costa Mesa PDT

Monday, October 19, 2026

Honolulu
Hawaii, United States
Mon, Oct 19
HSTUTC-10
Costa Mesa
California, United States
Mon, Oct 19
PDTUTC-7+3h
Finding your time zone…
Shared working hours (9:00–18:00)

Honolulu to Costa Mesa conversion table

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

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

Best time to call or meet

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

Daylight saving time and the difference

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

  • Oct 19, 2026 – Oct 31, 2026: +3h
  • Oct 31, 2026 – Mar 14, 2027: +2h
  • Mar 14, 2027 – Oct 19, 2027: +3h

Distance

Honolulu and Costa Mesa are 4,142 km (2,574 miles) apart in a straight line.

More conversions

Costa Mesa to HonoluluHonolulu to New YorkHonolulu to LondonHonolulu to Los AngelesHonolulu to ChicagoHonolulu to TorontoHonolulu to São PauloHonolulu to ParisHonolulu to BerlinHonolulu to MoscowHonolulu to DubaiHonolulu to New DelhiHonolulu 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 Honolulu and Costa Mesa?

Costa Mesa is 3 hours ahead of Honolulu.

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

When it is 9:00 AM in Honolulu, it is 12:00 PM in Costa Mesa.

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

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

Does the time difference between Honolulu 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.