Rio de Janeiro to O'Fallon, MO: time difference
O'Fallon, MO is 2 h behind Rio de Janeiro. Live clocks for both, the working hours they share, and how each one sits against your own time.
Your time
One day, 2 clocks
Drag along the band to read any hour in every place at once.
Rio de Janeiro 21:58 9:58 PM O'Fallon, MO 19:58 7:58 PM You –:–
21:58 9:58 PM
Brasilia Standard Time · UTC-3
☀️ 05:16 · 🌙 18:00
19:58 7:58 PM
Central Daylight Time · UTC-5
☀️ 07:19 · 🌙 18:17
·
−2 h
O'Fallon, MO is 2 h behind Rio de Janeiro.
When you, Rio de Janeiro and O'Fallon, MO are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇧🇷 Rio de Janeiro
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
🇺🇸 O'Fallon, MO
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 21 9 PM
📍 Your time
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇧🇷 Rio de Janeiro | 🇺🇸 O'Fallon, MO |
|---|---|---|
| Local time | 21:58 | 19:58 |
| Local date | Wednesday, October 21, 2026 | Wednesday, October 21, 2026 |
| Time zone | Brasilia Standard Time | Central Daylight Time |
| UTC offset | UTC-3 | UTC-5 |
| Offset from Rio de Janeiro | — | −2 h |
| IANA zone | America/Sao Paulo | America/Chicago |
| Daylight saving | Not observed | On summer time → UTC-6, Nov 1, 01:00 |
| Sunrise | 05:16 | 07:19 |
| Sunset | 18:00 | 18:17 |
| Daylight | 12 h 44 min | 10 h 59 min |
| People on this clock | 6,211,223 | 94,074 |
Compare Rio de Janeiro with another city
More comparisons with Rio de Janeiro: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Rio de Janeiro and O'Fallon, MO: common questions
How many hours behind Rio de Janeiro is O'Fallon, MO?
The clocks in O'Fallon are 2 hours behind those in Rio de Janeiro (UTC−5 and UTC−3).
If it is 9:00 AM in Rio de Janeiro, what time is it in O'Fallon, MO?
At 9:00 AM in Rio de Janeiro, clocks in O'Fallon show 7:00 AM.
What time is it in O'Fallon, MO, when it is 6:00 PM in Rio de Janeiro?
When it is 6:00 PM in Rio de Janeiro, it is 4:00 PM in O'Fallon.
When do working hours in Rio de Janeiro and in O'Fallon, MO, overlap?
Working hours (9:00 AM–6:00 PM) overlap from 11:00 AM to 6:00 PM in Rio de Janeiro, which is 9:00 AM to 4:00 PM in O'Fallon.
When does the date change in O'Fallon, MO, compared with Rio de Janeiro?
The new day starts in O'Fallon later: until 2:00 AM in Rio de Janeiro, it is still the previous day there. From 10:00 PM in O'Fallon, Rio de Janeiro is already on the next day.
Is the time difference between Rio de Janeiro and O'Fallon, MO, the same all year?
No. Only O'Fallon switches to summer time, so the gap changes twice a year. From November 1, 2026, O'Fallon will be 3 hours behind Rio de Janeiro.
