Istanbul to Castro Valley time converter

Castro Valley is 10 hours behind Istanbul. When it is 9:00 AM in Istanbul, it is 11:00 PM (Tue, Oct 20) in Castro Valley.

Istanbul TRT

Wednesday, October 21, 2026

Castro Valley PDT

Tuesday, October 20, 2026

Istanbul
Turkey
Wed, Oct 21
TRTUTC+3
Castro Valley
California, United States
Tue, Oct 20
PDTUTC-7-10h
Finding your time zone…
Shared working hours (9:00–18:00)

Istanbul to Castro Valley conversion table

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

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

Best time to call or meet

Working hours don't overlap fully. The closest fit is 5:00 PM – 6:00 PM in Istanbul (7:00 AM – 8:00 AM in Castro Valley): working hours on one side, early or late on the other.

Daylight saving time and the difference

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

  • Oct 21, 2026 – Nov 1, 2026: -10h
  • Nov 1, 2026 – Mar 14, 2027: -11h
  • Mar 14, 2027 – Oct 21, 2027: -10h

Distance

Istanbul and Castro Valley are 10,781 km (6,699 miles) apart in a straight line.

More conversions

Castro Valley to IstanbulIstanbul to New YorkIstanbul to LondonIstanbul to Los AngelesIstanbul to ChicagoIstanbul to TorontoIstanbul to São PauloIstanbul to ParisIstanbul to BerlinIstanbul to MoscowIstanbul to DubaiIstanbul to New DelhiIstanbul 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 Istanbul and Castro Valley?

Castro Valley is 10 hours behind Istanbul.

What time is it in Castro Valley when it is 9 AM in Istanbul?

When it is 9:00 AM in Istanbul, it is 11:00 PM (Tue, Oct 20) in Castro Valley.

When is the best time to call Castro Valley from Istanbul?

Working hours don't overlap fully. The closest fit is 5:00 PM – 6:00 PM in Istanbul (7:00 AM – 8:00 AM in Castro Valley): working hours on one side, early or late on the other.

Does the time difference between Istanbul 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.