Castle Rock, CO to Rio de Janeiro: time difference
Rio de Janeiro is 3 h ahead of Castle Rock, CO. 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.
Castle Rock, CO 12:22 12:22 PM Rio de Janeiro 15:22 3:22 PM You –:–
12:22 12:22 PM
Mountain Daylight Time · UTC-6
☀️ 07:05 · 🌙 18:29
15:22 3:22 PM
Brasilia Standard Time · UTC-3
☀️ 05:26 · 🌙 17:55
·
+3 h
Rio de Janeiro is 3 h ahead of Castle Rock, CO.
When you, Castle Rock, CO 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
🇺🇸 Castle Rock, CO
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 | 🇺🇸 Castle Rock, CO | 🇧🇷 Rio de Janeiro |
|---|---|---|
| Local time | 12:22 | 15:22 |
| Local date | Saturday, October 10, 2026 | Saturday, October 10, 2026 |
| Time zone | Mountain Daylight Time | Brasilia Standard Time |
| UTC offset | UTC-6 | UTC-3 |
| Offset from Castle Rock, CO | — | +3 h |
| IANA zone | America/Denver | America/Sao Paulo |
| Daylight saving | On summer time → UTC-7, Nov 1, 01:00 | Not observed |
| Sunrise | 07:05 | 05:26 |
| Sunset | 18:29 | 17:55 |
| Daylight | 11 h 25 min | 12 h 30 min |
| People on this clock | 73,158 | 6,211,223 |
Compare Castle Rock, CO with another city
More comparisons with Castle Rock, CO: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Castle Rock, CO and Rio de Janeiro: common questions
How far ahead of Castle Rock, CO, is Rio de Janeiro?
Rio de Janeiro is 3 hours ahead of Castle Rock: UTC−3 against UTC−6.
What time is it in Rio de Janeiro at the start of the working day in Castle Rock, CO?
The working day in Castle Rock starts at 9:00 AM; in Rio de Janeiro it is 12:00 PM at that moment.
What time is it in Rio de Janeiro at the end of the working day in Castle Rock, CO?
The working day in Castle Rock 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 Castle Rock, CO?
Between 9:00 AM and 3:00 PM in Castle Rock – 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).
When does the date change in Rio de Janeiro compared with Castle Rock, CO?
The new day starts in Rio de Janeiro earlier: at 9:00 PM in Castle Rock it is already midnight there. Until 3:00 AM in Rio de Janeiro, Castle Rock is still on the previous day.
Does the time gap between Castle Rock, CO, and Rio de Janeiro change during the year?
Yes – daylight saving time is used in Castle Rock but not in Rio de Janeiro. From November 1, 2026, Rio de Janeiro will be 4 hours ahead of Castle Rock.
