Buenos Aires to Castelo Branco: time difference
Castelo Branco is 4 h ahead of Buenos Aires. Live clocks for both, the working hours they share, and how each one sits against your own time.
🇵🇹 Castelo Branco, Portugal
31
- Western European Summer Time
- UTC+1
- Daytime
☀️ 07:45 · 🌙 18:46 · 11 h 2 min
+4 h
Your time
One day, 2 clocks
Drag along the band to read any hour in every place at once.
Buenos Aires 10:57 10:57 AM Castelo Branco 14:57 2:57 PM You –:–
10:57 10:57 AM
Argentina Standard Time · UTC-3
☀️ 06:07 · 🌙 19:11
14:57 2:57 PM
Western European Summer Time · UTC+1
☀️ 07:45 · 🌙 18:46
·
+4 h
Castelo Branco is 4 h ahead of Buenos Aires.
When you, Buenos Aires and Castelo Branco are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇦🇷 Buenos Aires
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
🇵🇹 Castelo Branco
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 0 12 AM 1 1 AM 2 2 AM 3 3 AM
📍 Your time
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇦🇷 Buenos Aires | 🇵🇹 Castelo Branco |
|---|---|---|
| Local time | 10:57 | 14:57 |
| Local date | Monday, October 19, 2026 | Monday, October 19, 2026 |
| Time zone | Argentina Standard Time | Western European Summer Time |
| UTC offset | UTC-3 | UTC+1 |
| Offset from Buenos Aires | — | +4 h |
| IANA zone | America/Argentina/Buenos Aires | Europe/Lisbon |
| Daylight saving | Not observed | On summer time → UTC+0, Oct 25, 01:00 |
| Sunrise | 06:07 | 07:45 |
| Sunset | 19:11 | 18:46 |
| Daylight | 13 h 4 min | 11 h 2 min |
| People on this clock | 2,891,082 | 52,291 |
Compare Buenos Aires with another city
More comparisons with Buenos Aires: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Buenos Aires and Castelo Branco: common questions
How far ahead of Buenos Aires is Castelo Branco?
Castelo Branco is 4 hours ahead of Buenos Aires: UTC+1 against UTC−3.
What time is it in Castelo Branco when it is 9:00 AM in Buenos Aires?
When it is 9:00 AM in Buenos Aires, it is 1:00 PM in Castelo Branco.
If it is 6:00 PM in Buenos Aires, what time is it in Castelo Branco?
At 6:00 PM in Buenos Aires, clocks in Castelo Branco show 10:00 PM.
When is a good time to call Castelo Branco from Buenos Aires?
Between 9:00 AM and 2:00 PM in Buenos Aires – that is 1:00 PM to 6:00 PM in Castelo Branco – both places are within working hours (9:00 AM–6:00 PM).
When is it already the next day in Castelo Branco?
From 8:00 PM in Buenos Aires it is already the next day in Castelo Branco. The other way round, until 4:00 AM in Castelo Branco it is still the previous day in Buenos Aires.
Does the time gap between Buenos Aires and Castelo Branco change during the year?
Yes – daylight saving time is used in Castelo Branco but not in Buenos Aires. From October 25, 2026, Castelo Branco will be 3 hours ahead of Buenos Aires.
