Castro Valley to Buenos Aires time converter

Buenos Aires is 4 hours ahead of Castro Valley. When it is 9:00 AM in Castro Valley, it is 1:00 PM in Buenos Aires.

Castro Valley PDT

Tuesday, October 20, 2026

Buenos Aires ART

Tuesday, October 20, 2026

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

Castro Valley to Buenos Aires conversion table

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

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

Best time to call or meet

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

Daylight saving time and the difference

The difference changes during the year because Castro Valley and Buenos Aires 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

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

More conversions

Buenos Aires to Castro ValleyCastro Valley to New YorkCastro Valley to LondonCastro Valley to Los AngelesCastro Valley to ChicagoCastro Valley to TorontoCastro Valley to São PauloCastro Valley to ParisCastro Valley to BerlinCastro Valley to MoscowCastro Valley to DubaiCastro Valley to New DelhiCastro Valley to Bangkok
New York to Buenos AiresLondon to Buenos AiresLos Angeles to Buenos AiresChicago to Buenos AiresToronto to Buenos AiresSão Paulo to Buenos AiresParis to Buenos AiresBerlin to Buenos AiresMoscow to Buenos AiresDubai to Buenos AiresNew Delhi to Buenos AiresBangkok to Buenos Aires

Questions and answers

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

Buenos Aires is 4 hours ahead of Castro Valley.

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

When it is 9:00 AM in Castro Valley, it is 1:00 PM in Buenos Aires.

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

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

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

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