Rio de Janeiro to Castle Rock, CO: time difference
Castle Rock, CO 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 16:00 4:00 PM Castle Rock, CO 13:00 1:00 PM You –:–
16:00 4:00 PM
Brasilia Standard Time · UTC-3
☀️ 05:26 · 🌙 17:55
13:00 1:00 PM
Mountain Daylight Time · UTC-6
☀️ 07:05 · 🌙 18:29
·
−3 h
Castle Rock, CO is 3 h behind Rio de Janeiro.
When you, Rio de Janeiro and Castle Rock, CO 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
🇺🇸 Castle Rock, CO
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 | 🇺🇸 Castle Rock, CO |
|---|---|---|
| Local time | 16:00 | 13:00 |
| Local date | Saturday, October 10, 2026 | Saturday, October 10, 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 | 05:26 | 07:05 |
| Sunset | 17:55 | 18:29 |
| Daylight | 12 h 30 min | 11 h 25 min |
| People on this clock | 6,211,223 | 73,158 |
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 Castle Rock, CO: common questions
How far behind Rio de Janeiro is Castle Rock, CO?
Castle Rock is 3 hours behind Rio de Janeiro: UTC−6 against UTC−3.
If it is 9:00 AM in Rio de Janeiro, what time is it in Castle Rock, CO?
At 9:00 AM in Rio de Janeiro, clocks in Castle Rock show 6:00 AM.
What time is it in Castle Rock, CO, at the end of the working day in Rio de Janeiro?
The working day in Rio de Janeiro ends at 6:00 PM; in Castle Rock it is 3:00 PM at that moment.
When do working hours in Rio de Janeiro and in Castle Rock, CO, overlap?
Working hours (9:00 AM–6:00 PM) overlap from 12:00 PM to 6:00 PM in Rio de Janeiro, which is 9:00 AM to 3:00 PM in Castle Rock.
When is it still the previous day in Castle Rock, CO?
Until 3:00 AM in Rio de Janeiro it is still the previous day in Castle Rock. The other way round, from 9:00 PM in Castle Rock it is already the next day in Rio de Janeiro.
Does the time gap between Rio de Janeiro and Castle Rock, CO, change during the year?
Yes – daylight saving time is used in Castle Rock but not in Rio de Janeiro. From November 1, 2026, Castle Rock will be 4 hours behind Rio de Janeiro.
