Boulder, CO to Sao Paulo: time difference
Sao Paulo is 3 h ahead of Boulder, CO. 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.
Boulder, CO 06:27 6:27 AM Sao Paulo 09:27 9:27 AM You –:–
06:27 6:27 AM
Mountain Daylight Time · UTC-6
☀️ 07:19 · 🌙 18:17
09:27 9:27 AM
Brasilia Standard Time · UTC-3
☀️ 05:30 · 🌙 18:14
·
+3 h
Sao Paulo is 3 h ahead of Boulder, CO.
When you, Boulder, CO and Sao Paulo are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇺🇸 Boulder, 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
🇧🇷 Sao Paulo
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 | 🇺🇸 Boulder, CO | 🇧🇷 Sao Paulo |
|---|---|---|
| Local time | 06:27 | 09:27 |
| Local date | Tuesday, October 20, 2026 | Tuesday, October 20, 2026 |
| Time zone | Mountain Daylight Time | Brasilia Standard Time |
| UTC offset | UTC-6 | UTC-3 |
| Offset from Boulder, CO | — | +3 h |
| IANA zone | America/Denver | America/Sao Paulo |
| Daylight saving | On summer time → UTC-7, Nov 1, 01:00 | Not observed |
| Sunrise | 07:19 | 05:30 |
| Sunset | 18:17 | 18:14 |
| Daylight | 10 h 58 min | 12 h 44 min |
| People on this clock | 106,803 | 11,451,999 |
Compare Boulder, CO with another city
More comparisons with Boulder, CO: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
Boulder, CO and Sao Paulo: common questions
How far ahead of Boulder, CO, is Sao Paulo?
Sao Paulo is 3 hours ahead of Boulder: UTC−3 against UTC−6.
If it is 9:00 AM in Boulder, CO, what time is it in Sao Paulo?
At 9:00 AM in Boulder, clocks in Sao Paulo show 12:00 PM.
What time is it in Sao Paulo at the end of the working day in Boulder, CO?
The working day in Boulder ends at 6:00 PM; in Sao Paulo it is 9:00 PM at that moment.
Is there a time when both Boulder, CO, and Sao Paulo are at work?
Yes: from 9:00 AM to 3:00 PM in Boulder (12:00 PM to 6:00 PM in Sao Paulo), the working days (9:00 AM–6:00 PM) overlap.
From what time in Boulder, CO, is it tomorrow in Sao Paulo?
Once it is 9:00 PM in Boulder, the date in Sao Paulo has already changed. Until 3:00 AM in Sao Paulo, it is still the previous day in Boulder.
Does the time gap between Boulder, CO, and Sao Paulo change during the year?
Yes – daylight saving time is used in Boulder but not in Sao Paulo. From November 1, 2026, Sao Paulo will be 4 hours ahead of Boulder.
