Hong Kong to Castro Valley time converter

Castro Valley is 15 hours behind Hong Kong. When it is 9:00 AM in Hong Kong, it is 6:00 PM (Wed, Oct 21) in Castro Valley.

Hong Kong HKT

Thursday, October 22, 2026

Castro Valley PDT

Wednesday, October 21, 2026

Hong Kong
Thu, Oct 22
HKTUTC+8
Castro Valley
California, United States
Wed, Oct 21
PDTUTC-7-15h
Finding your time zone…
Shared working hours (9:00–18:00)

Hong Kong to Castro Valley conversion table

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

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

Best time to call or meet

Working hours don't overlap fully. The closest fit is 7:00 AM – 9:00 AM in Hong Kong (4:00 PM – 6:00 PM 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 Hong Kong and Castro Valley switch clocks on different dates:

  • Oct 22, 2026 – Nov 1, 2026: -15h
  • Nov 1, 2026 – Mar 14, 2027: -16h
  • Mar 14, 2027 – Oct 22, 2027: -15h

More conversions

Castro Valley to Hong KongHong Kong to New YorkHong Kong to LondonHong Kong to Los AngelesHong Kong to ChicagoHong Kong to TorontoHong Kong to São PauloHong Kong to ParisHong Kong to BerlinHong Kong to MoscowHong Kong to DubaiHong Kong to New DelhiHong Kong 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 Hong Kong and Castro Valley?

Castro Valley is 15 hours behind Hong Kong.

What time is it in Castro Valley when it is 9 AM in Hong Kong?

When it is 9:00 AM in Hong Kong, it is 6:00 PM (Wed, Oct 21) in Castro Valley.

When is the best time to call Castro Valley from Hong Kong?

Working hours don't overlap fully. The closest fit is 7:00 AM – 9:00 AM in Hong Kong (4:00 PM – 6:00 PM in Castro Valley): working hours on one side, early or late on the other.

Does the time difference between Hong Kong 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.