O'Fallon, MO to Rio de Janeiro: time difference
Rio de Janeiro is 2 h ahead of O'Fallon, MO. 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.
O'Fallon, MO 19:06 7:06 PM Rio de Janeiro 21:06 9:06 PM You –:–
19:06 7:06 PM
Central Daylight Time · UTC-5
☀️ 07:19 · 🌙 18:17
21:06 9:06 PM
Brasilia Standard Time · UTC-3
☀️ 05:16 · 🌙 18:00
·
+2 h
Rio de Janeiro is 2 h ahead of O'Fallon, MO.
When you, O'Fallon, MO 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
🇺🇸 O'Fallon, MO
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
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇺🇸 O'Fallon, MO | 🇧🇷 Rio de Janeiro |
|---|---|---|
| Local time | 19:06 | 21:06 |
| Local date | Wednesday, October 21, 2026 | Wednesday, October 21, 2026 |
| Time zone | Central Daylight Time | Brasilia Standard Time |
| UTC offset | UTC-5 | UTC-3 |
| Offset from O'Fallon, MO | — | +2 h |
| IANA zone | America/Chicago | America/Sao Paulo |
| Daylight saving | On summer time → UTC-6, Nov 1, 01:00 | Not observed |
| Sunrise | 07:19 | 05:16 |
| Sunset | 18:17 | 18:00 |
| Daylight | 10 h 59 min | 12 h 44 min |
| People on this clock | 94,074 | 6,211,223 |
Compare O'Fallon, MO with another city
More comparisons with O'Fallon, MO: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
O'Fallon, MO and Rio de Janeiro: common questions
How far ahead of O'Fallon, MO, is Rio de Janeiro?
Rio de Janeiro is 2 hours ahead of O'Fallon: UTC−3 against UTC−5.
What time is it in Rio de Janeiro when it is 9:00 AM in O'Fallon, MO?
When it is 9:00 AM in O'Fallon, 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 O'Fallon, MO?
The working day in O'Fallon ends at 6:00 PM; in Rio de Janeiro it is 8:00 PM at that moment.
Is there a time when both O'Fallon, MO, and Rio de Janeiro are at work?
Yes: from 9:00 AM to 4:00 PM in O'Fallon (11:00 AM to 6:00 PM in Rio de Janeiro), the working days (9:00 AM–6:00 PM) overlap.
When is it already the next day in Rio de Janeiro?
From 10:00 PM in O'Fallon, MO, it is already the next day in Rio de Janeiro. The other way round, until 2:00 AM in Rio de Janeiro it is still the previous day in O'Fallon.
Is the time difference between O'Fallon, MO, and Rio de Janeiro the same all year?
No. Only O'Fallon switches to summer time, so the gap changes twice a year. From November 1, 2026, Rio de Janeiro will be 3 hours ahead of O'Fallon.
