Sao Paulo to Boulder, CO: time difference
Boulder, CO is 3 h behind Sao Paulo. 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.
Sao Paulo 14:55 2:55 PM Boulder, CO 11:55 11:55 AM You –:–
14:55 2:55 PM
Brasilia Standard Time · UTC-3
☀️ 05:30 · 🌙 18:14
11:55 11:55 AM
Mountain Daylight Time · UTC-6
☀️ 07:19 · 🌙 18:17
·
−3 h
Boulder, CO is 3 h behind Sao Paulo.
When you, Sao Paulo and Boulder, 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
🇧🇷 Sao Paulo
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
🇺🇸 Boulder, 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 | 🇧🇷 Sao Paulo | 🇺🇸 Boulder, CO |
|---|---|---|
| Local time | 14:55 | 11:55 |
| Local date | Tuesday, October 20, 2026 | Tuesday, October 20, 2026 |
| Time zone | Brasilia Standard Time | Mountain Daylight Time |
| UTC offset | UTC-3 | UTC-6 |
| Offset from Sao Paulo | — | −3 h |
| IANA zone | America/Sao Paulo | America/Denver |
| Daylight saving | Not observed | On summer time → UTC-7, Nov 1, 01:00 |
| Sunrise | 05:30 | 07:19 |
| Sunset | 18:14 | 18:17 |
| Daylight | 12 h 44 min | 10 h 58 min |
| People on this clock | 11,451,999 | 106,803 |
Compare Sao Paulo with another city
More comparisons with Sao Paulo: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Sao Paulo and Boulder, CO: common questions
How far behind Sao Paulo is Boulder, CO?
Boulder is 3 hours behind Sao Paulo: UTC−6 against UTC−3.
What time is it in Boulder, CO, at the start of the working day in Sao Paulo?
The working day in Sao Paulo starts at 9:00 AM; in Boulder it is 6:00 AM at that moment.
What time is it in Boulder, CO, when it is 6:00 PM in Sao Paulo?
When it is 6:00 PM in Sao Paulo, it is 3:00 PM in Boulder.
When do working hours in Sao Paulo and in Boulder, CO, overlap?
Working hours (9:00 AM–6:00 PM) overlap from 12:00 PM to 6:00 PM in Sao Paulo, which is 9:00 AM to 3:00 PM in Boulder.
When does the date change in Boulder, CO, compared with Sao Paulo?
The new day starts in Boulder later: until 3:00 AM in Sao Paulo, it is still the previous day there. From 9:00 PM in Boulder, Sao Paulo is already on the next day.
Is the time difference between Sao Paulo and Boulder, CO, the same all year?
No. Only Boulder switches to summer time, so the gap changes twice a year. From November 1, 2026, Boulder will be 4 hours behind Sao Paulo.
