Porto to Rio das Ostras: time difference
Rio das Ostras is 3 h behind Porto. Live clocks for both, the working hours they share, and how each one sits against your own time.
−3 h
Your time
One day, 2 clocks
Drag along the band to read any hour in every place at once.
Porto 23:45 11:45 PM Rio das Ostras 20:45 8:45 PM You –:–
23:45 11:45 PM
Western European Standard Time · UTC+0
☀️ 07:11 · 🌙 17:27
20:45 8:45 PM
Brasilia Standard Time · UTC-3
☀️ 05:02 · 🌙 18:03
·
−3 h
Rio das Ostras is 3 h behind Porto.
When you, Porto and Rio das Ostras are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇵🇹 Porto
0 12 AM 1 1 AM 2 2 AM 3 3 AM 4 4 AM 5 5 AM 6 6 AM 7 7 AM 8 8 AM 9 9 AM 10 10 AM 11 11 AM 12 12 PM 13 1 PM 14 2 PM 15 3 PM 16 4 PM 17 5 PM 18 6 PM 19 7 PM 20 8 PM 21 9 PM 22 10 PM 23 11 PM
🇧🇷 Rio das Ostras
21 9 PM 22 10 PM 23 11 PM 0 12 AM 1 1 AM 2 2 AM 3 3 AM 4 4 AM 5 5 AM 6 6 AM 7 7 AM 8 8 AM 9 9 AM 10 10 AM 11 11 AM 12 12 PM 13 1 PM 14 2 PM 15 3 PM 16 4 PM 17 5 PM 18 6 PM 19 7 PM 20 8 PM
📍 Your time
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇵🇹 Porto | 🇧🇷 Rio das Ostras |
|---|---|---|
| Local time | 23:45 | 20:45 |
| Local date | Thursday, November 5, 2026 | Thursday, November 5, 2026 |
| Time zone | Western European Standard Time | Brasilia Standard Time |
| UTC offset | UTC+0 | UTC-3 |
| Offset from Porto | — | −3 h |
| IANA zone | Europe/Lisbon | America/Sao Paulo |
| Daylight saving | On standard time → UTC+1, Mar 28, 02:00 | Not observed |
| Sunrise | 07:11 | 05:02 |
| Sunset | 17:27 | 18:03 |
| Daylight | 10 h 16 min | 13 h 1 min |
| People on this clock | 231,828 | 156,491 |
Compare Porto with another city
More comparisons with Porto: the time zones next to it and the far side of the clock.
Big time differences
Porto and Rio das Ostras: common questions
What is the time difference between Porto and Rio das Ostras?
Rio das Ostras is 3 hours behind: it uses UTC−3, while Porto is on UTC+0.
If it is 9:00 AM in Porto, what time is it in Rio das Ostras?
At 9:00 AM in Porto, clocks in Rio das Ostras show 6:00 AM.
If it is 6:00 PM in Porto, what time is it in Rio das Ostras?
At 6:00 PM in Porto, clocks in Rio das Ostras show 3:00 PM.
When do working hours in Porto and in Rio das Ostras overlap?
Working hours (9:00 AM–6:00 PM) overlap from 12:00 PM to 6:00 PM in Porto, which is 9:00 AM to 3:00 PM in Rio das Ostras.
When is it still the previous day in Rio das Ostras?
Until 3:00 AM in Porto it is still the previous day in Rio das Ostras. The other way round, from 9:00 PM in Rio das Ostras it is already the next day in Porto.
Does the time gap between Porto and Rio das Ostras change during the year?
Yes – daylight saving time is used in Porto but not in Rio das Ostras. From March 28, 2027, Rio das Ostras will be 4 hours behind Porto.
