Guam to Porto time converter

Porto is 9 hours behind Guam. When it is 9:00 AM in Guam, it is 12:00 AM in Porto.

Guam ChST

Tuesday, October 20, 2026

Porto WEST

Tuesday, October 20, 2026

Guam
Tue, Oct 20
ChSTUTC+10
Porto
Portugal
Tue, Oct 20
WESTUTC+1-9h
Finding your time zone…
Shared working hours (9:00–18:00)

Guam to Porto conversion table

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

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

Best time to call or meet

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

Daylight saving time and the difference

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

  • Oct 20, 2026 – Oct 25, 2026: -9h
  • Oct 25, 2026 – Mar 28, 2027: -10h
  • Mar 28, 2027 – Oct 20, 2027: -9h

More conversions

Porto to GuamGuam to New YorkGuam to LondonGuam to Los AngelesGuam to ChicagoGuam to TorontoGuam to São PauloGuam to ParisGuam to BerlinGuam to MoscowGuam to DubaiGuam to New DelhiGuam to Bangkok
New York to PortoLondon to PortoLos Angeles to PortoChicago to PortoToronto to PortoSão Paulo to PortoParis to PortoBerlin to PortoMoscow to PortoDubai to PortoNew Delhi to PortoBangkok to Porto

Questions and answers

What is the time difference between Guam and Porto?

Porto is 9 hours behind Guam.

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

When it is 9:00 AM in Guam, it is 12:00 AM in Porto.

When is the best time to call Porto from Guam?

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

Does the time difference between Guam and Porto change?

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