Porto to Back Bay time converter

Back Bay is 5 hours behind Porto. When it is 9:00 AM in Porto, it is 4:00 AM in Back Bay.

Porto WEST

Tuesday, October 20, 2026

Back Bay EDT

Monday, October 19, 2026

Porto
Portugal
Tue, Oct 20
WESTUTC+1
Back Bay
Massachusetts, United States
Mon, Oct 19
EDTUTC-4-5h
Finding your time zone…
Shared working hours (9:00–18:00)

Porto to Back Bay conversion table

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

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

Best time to call or meet

Both sides are at work from 2:00 PM – 6:00 PM in Porto (9:00 AM – 1:00 PM in Back Bay).

Daylight saving time and the difference

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

  • Oct 20, 2026 – Oct 25, 2026: -5h
  • Oct 25, 2026 – Nov 1, 2026: -4h
  • Nov 1, 2026 – Mar 14, 2027: -5h
  • Mar 14, 2027 – Mar 28, 2027: -4h
  • Mar 28, 2027 – Oct 20, 2027: -5h

Distance

Porto and Back Bay are 5,063 km (3,146 miles) apart in a straight line.

More conversions

Back Bay 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 Back BayLondon to Back BayLos Angeles to Back BayChicago to Back BayToronto to Back BaySão Paulo to Back BayParis to Back BayBerlin to Back BayMoscow to Back BayDubai to Back BayNew Delhi to Back BayBangkok to Back Bay

Questions and answers

What is the time difference between Porto and Back Bay?

Back Bay is 5 hours behind Porto.

What time is it in Back Bay when it is 9 AM in Porto?

When it is 9:00 AM in Porto, it is 4:00 AM in Back Bay.

When is the best time to call Back Bay from Porto?

Both sides are at work from 2:00 PM – 6:00 PM in Porto (9:00 AM – 1:00 PM in Back Bay).

Does the time difference between Porto and Back Bay change?

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