Rio de Janeiro to Casper, WY: time difference
Casper, WY is 3 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 11:10 11:10 AM Casper, WY 08:10 8:10 AM You –:–
11:10 11:10 AM
Brasilia Standard Time · UTC-3
☀️ 05:18 · 🌙 17:59
08:10 8:10 AM
Mountain Daylight Time · UTC-6
☀️ 07:24 · 🌙 18:18
·
−3 h
Casper, WY is 3 h behind Rio de Janeiro.
When you, Rio de Janeiro and Casper, WY 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
🇺🇸 Casper, WY
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 | 🇧🇷 Rio de Janeiro | 🇺🇸 Casper, WY |
|---|---|---|
| Local time | 11:10 | 08:10 |
| Local date | Monday, October 19, 2026 | Monday, October 19, 2026 |
| Time zone | Brasilia Standard Time | Mountain Daylight Time |
| UTC offset | UTC-3 | UTC-6 |
| Offset from Rio de Janeiro | — | −3 h |
| IANA zone | America/Sao Paulo | America/Denver |
| Daylight saving | Not observed | On summer time → UTC-7, Nov 1, 01:00 |
| Sunrise | 05:18 | 07:24 |
| Sunset | 17:59 | 18:18 |
| Daylight | 12 h 41 min | 10 h 54 min |
| People on this clock | 6,211,223 | 58,763 |
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 Casper, WY: common questions
How many hours behind Rio de Janeiro is Casper, WY?
The clocks in Casper are 3 hours behind those in Rio de Janeiro (UTC−6 and UTC−3).
What time is it in Casper, WY, at the start of the working day in Rio de Janeiro?
The working day in Rio de Janeiro starts at 9:00 AM; in Casper it is 6:00 AM at that moment.
If it is 6:00 PM in Rio de Janeiro, what time is it in Casper, WY?
At 6:00 PM in Rio de Janeiro, clocks in Casper show 3:00 PM.
When is a good time to call Casper, WY, from Rio de Janeiro?
Between 12:00 PM and 6:00 PM in Rio de Janeiro – that is 9:00 AM to 3:00 PM in Casper – both places are within working hours (9:00 AM–6:00 PM).
When is it still the previous day in Casper, WY?
Until 3:00 AM in Rio de Janeiro it is still the previous day in Casper. The other way round, from 9:00 PM in Casper it is already the next day in Rio de Janeiro.
Is the time difference between Rio de Janeiro and Casper, WY, the same all year?
No. Only Casper switches to summer time, so the gap changes twice a year. From November 1, 2026, Casper will be 4 hours behind Rio de Janeiro.
