Buenos Aires to Castro Valley time converter

Castro Valley is 4 hours behind Buenos Aires. When it is 9:00 AM in Buenos Aires, it is 5:00 AM in Castro Valley.

Buenos Aires ART

Tuesday, October 20, 2026

Castro Valley PDT

Tuesday, October 20, 2026

Buenos Aires
Argentina
Tue, Oct 20
ARTUTC-3
Castro Valley
California, United States
Tue, Oct 20
PDTUTC-7-4h
Finding your time zone…
Shared working hours (9:00–18:00)

Buenos Aires to Castro Valley conversion table

Every hour of today in Buenos Aires and the matching time in Castro Valley. Light rows are typical working hours (9:00–18:00).

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

Best time to call or meet

Both sides are at work from 1:00 PM – 6:00 PM in Buenos Aires (9:00 AM – 2:00 PM in Castro Valley).

Daylight saving time and the difference

The difference changes during the year because Buenos Aires and Castro Valley switch clocks on different dates:

  • Oct 20, 2026 – Nov 1, 2026: -4h
  • Nov 1, 2026 – Mar 14, 2027: -5h
  • Mar 14, 2027 – Oct 20, 2027: -4h

Distance

Buenos Aires and Castro Valley are 10,383 km (6,452 miles) apart in a straight line.

More conversions

Castro Valley to Buenos AiresBuenos Aires to New YorkBuenos Aires to LondonBuenos Aires to Los AngelesBuenos Aires to ChicagoBuenos Aires to TorontoBuenos Aires to São PauloBuenos Aires to ParisBuenos Aires to BerlinBuenos Aires to MoscowBuenos Aires to DubaiBuenos Aires to New DelhiBuenos Aires to Bangkok
New York to Castro ValleyLondon to Castro ValleyLos Angeles to Castro ValleyChicago to Castro ValleyToronto to Castro ValleySão Paulo to Castro ValleyParis to Castro ValleyBerlin to Castro ValleyMoscow to Castro ValleyDubai to Castro ValleyNew Delhi to Castro ValleyBangkok to Castro Valley

Questions and answers

What is the time difference between Buenos Aires and Castro Valley?

Castro Valley is 4 hours behind Buenos Aires.

What time is it in Castro Valley when it is 9 AM in Buenos Aires?

When it is 9:00 AM in Buenos Aires, it is 5:00 AM in Castro Valley.

When is the best time to call Castro Valley from Buenos Aires?

Both sides are at work from 1:00 PM – 6:00 PM in Buenos Aires (9:00 AM – 2:00 PM in Castro Valley).

Does the time difference between Buenos Aires and Castro Valley change?

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