Union City to Seoul time converter

Seoul is 16 hours ahead of Union City. When it is 9:00 AM in Union City, it is 1:00 AM (Wed, Oct 21) in Seoul.

Union City PDT

Tuesday, October 20, 2026

Seoul KST

Wednesday, October 21, 2026

Union City
California, United States
Tue, Oct 20
PDTUTC-7
Seoul
South Korea
Wed, Oct 21
KSTUTC+9+16h
Finding your time zone…
Shared working hours (9:00–18:00)

Union City to Seoul conversion table

Every hour of today in Union City and the matching time in Seoul. Light rows are typical working hours (9:00–18:00).

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

Best time to call or meet

Both sides are at work from 5:00 PM – 6:00 PM in Union City (9:00 AM – 10:00 AM in Seoul).

Daylight saving time and the difference

The difference changes during the year because Union City and Seoul switch clocks on different dates:

  • Oct 20, 2026 – Nov 1, 2026: +16h
  • Nov 1, 2026 – Mar 14, 2027: +17h
  • Mar 14, 2027 – Oct 20, 2027: +16h

Distance

Union City and Seoul are 9,069 km (5,635 miles) apart in a straight line.

More conversions

Seoul to Union CityUnion City to New YorkUnion City to LondonUnion City to Los AngelesUnion City to ChicagoUnion City to TorontoUnion City to São PauloUnion City to ParisUnion City to BerlinUnion City to MoscowUnion City to DubaiUnion City to New DelhiUnion City to Bangkok
New York to SeoulLondon to SeoulLos Angeles to SeoulChicago to SeoulToronto to SeoulSão Paulo to SeoulParis to SeoulBerlin to SeoulMoscow to SeoulDubai to SeoulNew Delhi to SeoulBangkok to Seoul

Questions and answers

What is the time difference between Union City and Seoul?

Seoul is 16 hours ahead of Union City.

What time is it in Seoul when it is 9 AM in Union City?

When it is 9:00 AM in Union City, it is 1:00 AM (Wed, Oct 21) in Seoul.

When is the best time to call Seoul from Union City?

Both sides are at work from 5:00 PM – 6:00 PM in Union City (9:00 AM – 10:00 AM in Seoul).

Does the time difference between Union City and Seoul change?

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