London to Costa Mesa time converter

Costa Mesa is 8 hours behind London. When it is 9:00 AM in London, it is 1:00 AM in Costa Mesa.

London BST

Tuesday, October 20, 2026

Costa Mesa PDT

Monday, October 19, 2026

London
United Kingdom
Tue, Oct 20
BSTUTC+1
Costa Mesa
California, United States
Mon, Oct 19
PDTUTC-7-8h
Finding your time zone…
Shared working hours (9:00–18:00)

London to Costa Mesa conversion table

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

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

Best time to call or meet

Both sides are at work from 5:00 PM – 6:00 PM in London (9:00 AM – 10:00 AM in Costa Mesa).

Daylight saving time and the difference

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

  • Oct 20, 2026 – Oct 25, 2026: -8h
  • Oct 25, 2026 – Nov 1, 2026: -7h
  • Nov 1, 2026 – Mar 14, 2027: -8h
  • Mar 14, 2027 – Mar 28, 2027: -7h
  • Mar 28, 2027 – Oct 20, 2027: -8h

Distance

London and Costa Mesa are 8,777 km (5,454 miles) apart in a straight line.

More conversions

Costa Mesa to LondonLondon to New YorkLondon to Los AngelesLondon to ChicagoLondon to TorontoLondon to São PauloLondon to ParisLondon to BerlinLondon to MoscowLondon to DubaiLondon to New DelhiLondon to BangkokLondon to Singapore
New York 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 MesaSingapore to Costa Mesa

Questions and answers

What is the time difference between London and Costa Mesa?

Costa Mesa is 8 hours behind London.

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

When it is 9:00 AM in London, it is 1:00 AM in Costa Mesa.

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

Both sides are at work from 5:00 PM – 6:00 PM in London (9:00 AM – 10:00 AM in Costa Mesa).

Does the time difference between London 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.