Casper, WY to Rio de Janeiro: time difference
Rio de Janeiro is 3 h ahead of Casper, WY. Live clocks for both, the working hours they share, and how each one sits against your own time.
+3 h
Your time
One day, 2 clocks
Drag along the band to read any hour in every place at once.
Casper, WY 05:02 5:02 AM Rio de Janeiro 08:02 8:02 AM You –:–
05:02 5:02 AM
Mountain Daylight Time · UTC-6
☀️ 07:23 · 🌙 18:19
08:02 8:02 AM
Brasilia Standard Time · UTC-3
☀️ 05:19 · 🌙 17:59
·
+3 h
Rio de Janeiro is 3 h ahead of Casper, WY.
When you, Casper, WY 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
🇺🇸 Casper, WY
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
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 2 2 AM
📍 Your time
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Time zones side by side
| Detail | 🇺🇸 Casper, WY | 🇧🇷 Rio de Janeiro |
|---|---|---|
| Local time | 05:02 | 08:02 |
| Local date | Sunday, October 18, 2026 | Sunday, October 18, 2026 |
| Time zone | Mountain Daylight Time | Brasilia Standard Time |
| UTC offset | UTC-6 | UTC-3 |
| Offset from Casper, WY | — | +3 h |
| IANA zone | America/Denver | America/Sao Paulo |
| Daylight saving | On summer time → UTC-7, Nov 1, 01:00 | Not observed |
| Sunrise | 07:23 | 05:19 |
| Sunset | 18:19 | 17:59 |
| Daylight | 10 h 57 min | 12 h 40 min |
| People on this clock | 58,763 | 6,211,223 |
Compare Casper, WY with another city
More comparisons with Casper, WY: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Casper, WY and Rio de Janeiro: common questions
How many hours ahead of Casper, WY, is Rio de Janeiro?
The clocks in Rio de Janeiro are 3 hours ahead of those in Casper (UTC−3 and UTC−6).
What time is it in Rio de Janeiro when it is 9:00 AM in Casper, WY?
When it is 9:00 AM in Casper, it is 12:00 PM in Rio de Janeiro.
What time is it in Rio de Janeiro at the end of the working day in Casper, WY?
The working day in Casper ends at 6:00 PM; in Rio de Janeiro it is 9:00 PM at that moment.
When is a good time to call Rio de Janeiro from Casper, WY?
Between 9:00 AM and 3:00 PM in Casper – that is 12:00 PM to 6:00 PM in Rio de Janeiro – both places are within working hours (9:00 AM–6:00 PM).
From what time in Casper, WY, is it tomorrow in Rio de Janeiro?
Once it is 9:00 PM in Casper, the date in Rio de Janeiro has already changed. Until 3:00 AM in Rio de Janeiro, it is still the previous day in Casper.
Is the time difference between Casper, WY, and Rio de Janeiro the same all year?
No. Only Casper switches to summer time, so the gap changes twice a year. From November 1, 2026, Rio de Janeiro will be 4 hours ahead of Casper.
