Longmont, CO to Rio de Janeiro: time difference
Rio de Janeiro is 3 h ahead of Longmont, 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.
Longmont, CO 10:43 10:43 AM Rio de Janeiro 13:43 1:43 PM You –:–
10:43 10:43 AM
Mountain Daylight Time · UTC-6
☀️ 07:16 · 🌙 18:16
13:43 1:43 PM
Brasilia Standard Time · UTC-3
☀️ 05:18 · 🌙 17:59
·
+3 h
Rio de Janeiro is 3 h ahead of Longmont, CO.
When you, Longmont, 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
🇺🇸 Longmont, 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
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇺🇸 Longmont, CO | 🇧🇷 Rio de Janeiro |
|---|---|---|
| Local time | 10:43 | 13:43 |
| Local date | Monday, October 19, 2026 | Monday, October 19, 2026 |
| Time zone | Mountain Daylight Time | Brasilia Standard Time |
| UTC offset | UTC-6 | UTC-3 |
| Offset from Longmont, CO | — | +3 h |
| IANA zone | America/Denver | America/Sao Paulo |
| Daylight saving | On summer time → UTC-7, Nov 1, 01:00 | Not observed |
| Sunrise | 07:16 | 05:18 |
| Sunset | 18:16 | 17:59 |
| Daylight | 11 h | 12 h 41 min |
| People on this clock | 94,341 | 6,211,223 |
Compare Longmont, CO with another city
More comparisons with Longmont, CO: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Longmont, CO and Rio de Janeiro: common questions
What is the time difference between Longmont, CO, and Rio de Janeiro?
Rio de Janeiro is 3 hours ahead: it uses UTC−3, while Longmont is on UTC−6.
What time is it in Rio de Janeiro when it is 9:00 AM in Longmont, CO?
When it is 9:00 AM in Longmont, it is 12:00 PM in Rio de Janeiro.
What time is it in Rio de Janeiro when it is 6:00 PM in Longmont, CO?
When it is 6:00 PM in Longmont, it is 9:00 PM in Rio de Janeiro.
When is a good time to call Rio de Janeiro from Longmont, CO?
Between 9:00 AM and 3:00 PM in Longmont – 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 Longmont, CO, is it tomorrow in Rio de Janeiro?
Once it is 9:00 PM in Longmont, the date in Rio de Janeiro has already changed. Until 3:00 AM in Rio de Janeiro, it is still the previous day in Longmont.
Does the time gap between Longmont, CO, and Rio de Janeiro change during the year?
Yes – daylight saving time is used in Longmont but not in Rio de Janeiro. From November 1, 2026, Rio de Janeiro will be 4 hours ahead of Longmont.
