Rio de Janeiro to Longmont, CO: time difference
Longmont, 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 14:17 2:17 PM Longmont, CO 11:17 11:17 AM You –:–
14:17 2:17 PM
Brasilia Standard Time · UTC-3
☀️ 05:18 · 🌙 17:59
11:17 11:17 AM
Mountain Daylight Time · UTC-6
☀️ 07:16 · 🌙 18:16
·
−3 h
Longmont, CO is 3 h behind Rio de Janeiro.
When you, Rio de Janeiro and Longmont, 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
🇺🇸 Longmont, 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 | 🇺🇸 Longmont, CO |
|---|---|---|
| Local time | 14:17 | 11:17 |
| 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 | 07:16 |
| Sunset | 17:59 | 18:16 |
| Daylight | 12 h 41 min | 11 h |
| People on this clock | 6,211,223 | 94,341 |
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 Longmont, CO: common questions
How far behind Rio de Janeiro is Longmont, CO?
Longmont 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 Longmont, CO?
At 9:00 AM in Rio de Janeiro, clocks in Longmont show 6:00 AM.
If it is 6:00 PM in Rio de Janeiro, what time is it in Longmont, CO?
At 6:00 PM in Rio de Janeiro, clocks in Longmont show 3:00 PM.
Is there a time when both Rio de Janeiro and Longmont, CO, are at work?
Yes: from 12:00 PM to 6:00 PM in Rio de Janeiro (9:00 AM to 3:00 PM in Longmont), the working days (9:00 AM–6:00 PM) overlap.
Until what time in Rio de Janeiro is it still yesterday in Longmont, CO?
Before 3:00 AM in Rio de Janeiro, the date in Longmont has not changed yet. From 9:00 PM in Longmont, it is already the next day in Rio de Janeiro.
Does the time difference between Rio de Janeiro and Longmont, CO, change?
Yes. The clocks change only in Longmont. From November 1, 2026, Longmont will be 4 hours behind Rio de Janeiro.
