Alton, IL to Rio de Janeiro: time difference
Rio de Janeiro is 2 h ahead of Alton, IL. Live clocks for both, the working hours they share, and how each one sits against your own time.
+2 h
Your time
One day, 2 clocks
Drag along the band to read any hour in every place at once.
Alton, IL 13:52 1:52 PM Rio de Janeiro 15:52 3:52 PM You –:–
13:52 1:52 PM
Central Daylight Time · UTC-5
☀️ 07:16 · 🌙 18:17
15:52 3:52 PM
Brasilia Standard Time · UTC-3
☀️ 05:17 · 🌙 18:00
·
+2 h
Rio de Janeiro is 2 h ahead of Alton, IL.
When you, Alton, IL and Rio de Janeiro are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇺🇸 Alton, IL
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 de Janeiro
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 0 12 AM 1 1 AM
📍 Your time
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Time zones side by side
| Detail | 🇺🇸 Alton, IL | 🇧🇷 Rio de Janeiro |
|---|---|---|
| Local time | 13:52 | 15:52 |
| Local date | Tuesday, October 20, 2026 | Tuesday, October 20, 2026 |
| Time zone | Central Daylight Time | Brasilia Standard Time |
| UTC offset | UTC-5 | UTC-3 |
| Offset from Alton, IL | — | +2 h |
| IANA zone | America/Chicago | America/Sao Paulo |
| Daylight saving | On summer time → UTC-6, Nov 1, 01:00 | Not observed |
| Sunrise | 07:16 | 05:17 |
| Sunset | 18:17 | 18:00 |
| Daylight | 11 h 1 min | 12 h 43 min |
| People on this clock | 25,676 | 6,211,223 |
Compare Alton, IL with another city
More comparisons with Alton, IL: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Alton, IL and Rio de Janeiro: common questions
How many hours ahead of Alton, IL, is Rio de Janeiro?
The clocks in Rio de Janeiro are 2 hours ahead of those in Alton (UTC−3 and UTC−5).
What time is it in Rio de Janeiro when it is 9:00 AM in Alton, IL?
When it is 9:00 AM in Alton, it is 11:00 AM in Rio de Janeiro.
What time is it in Rio de Janeiro at the end of the working day in Alton, IL?
The working day in Alton ends at 6:00 PM; in Rio de Janeiro it is 8:00 PM at that moment.
When is a good time to call Rio de Janeiro from Alton, IL?
Between 9:00 AM and 4:00 PM in Alton – that is 11:00 AM to 6:00 PM in Rio de Janeiro – both places are within working hours (9:00 AM–6:00 PM).
From what time in Alton, IL, is it tomorrow in Rio de Janeiro?
Once it is 10:00 PM in Alton, the date in Rio de Janeiro has already changed. Until 2:00 AM in Rio de Janeiro, it is still the previous day in Alton.
Does the time gap between Alton, IL, and Rio de Janeiro change during the year?
Yes – daylight saving time is used in Alton but not in Rio de Janeiro. From November 1, 2026, Rio de Janeiro will be 3 hours ahead of Alton.
