Porto to Kosai time converter

Kosai is 8 hours ahead of Porto. When it is 9:00 AM in Porto, it is 5:00 PM in Kosai.

Porto WEST

Monday, October 19, 2026

Kosai JST

Tuesday, October 20, 2026

Porto
Portugal
Mon, Oct 19
WESTUTC+1
Kosai
Japan
Tue, Oct 20
JSTUTC+9+8h
Finding your time zone…
Shared working hours (9:00–18:00)

Porto to Kosai conversion table

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

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

Best time to call or meet

Both sides are at work from 9:00 AM – 10:00 AM in Porto (5:00 PM – 6:00 PM in Kosai).

Daylight saving time and the difference

The difference changes during the year because Porto and Kosai switch clocks on different dates:

  • Oct 19, 2026 – Oct 25, 2026: +8h
  • Oct 25, 2026 – Mar 28, 2027: +9h
  • Mar 28, 2027 – Oct 19, 2027: +8h

Distance

Porto and Kosai are 10,899 km (6,772 miles) apart in a straight line.

More conversions

Kosai to PortoPorto to New YorkPorto to LondonPorto to Los AngelesPorto to ChicagoPorto to TorontoPorto to São PauloPorto to ParisPorto to BerlinPorto to MoscowPorto to DubaiPorto to New DelhiPorto to Bangkok
New York to KosaiLondon to KosaiLos Angeles to KosaiChicago to KosaiToronto to KosaiSão Paulo to KosaiParis to KosaiBerlin to KosaiMoscow to KosaiDubai to KosaiNew Delhi to KosaiBangkok to Kosai

Questions and answers

What is the time difference between Porto and Kosai?

Kosai is 8 hours ahead of Porto.

What time is it in Kosai when it is 9 AM in Porto?

When it is 9:00 AM in Porto, it is 5:00 PM in Kosai.

When is the best time to call Kosai from Porto?

Both sides are at work from 9:00 AM – 10:00 AM in Porto (5:00 PM – 6:00 PM in Kosai).

Does the time difference between Porto and Kosai change?

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