Lisbon to Boulder, CO: time difference
Boulder, CO is 7 h behind Lisbon. 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.
Lisbon 15:14 3:14 PM Boulder, CO 08:14 8:14 AM You –:–
15:14 3:14 PM
Western European Summer Time · UTC+1
☀️ 07:51 · 🌙 18:53
08:14 8:14 AM
Mountain Daylight Time · UTC-6
☀️ 07:19 · 🌙 18:17
·
−7 h
Boulder, CO is 7 h behind Lisbon.
When you, Lisbon 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
🇵🇹 Lisbon
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
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 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
📍 Your time
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇵🇹 Lisbon | 🇺🇸 Boulder, CO |
|---|---|---|
| Local time | 15:14 | 08:14 |
| Local date | Tuesday, October 20, 2026 | Tuesday, October 20, 2026 |
| Time zone | Western European Summer Time | Mountain Daylight Time |
| UTC offset | UTC+1 | UTC-6 |
| Offset from Lisbon | — | −7 h |
| IANA zone | Europe/Lisbon | America/Denver |
| Daylight saving | On summer time → UTC+0, Oct 25, 01:00 | On summer time → UTC-7, Nov 1, 01:00 |
| Sunrise | 07:51 | 07:19 |
| Sunset | 18:53 | 18:17 |
| Daylight | 11 h 2 min | 10 h 58 min |
| People on this clock | 545,923 | 106,803 |
Compare Lisbon with another city
More comparisons with Lisbon: the time zones next to it and the far side of the clock.
Big time differences
Lisbon and Boulder, CO: common questions
How far behind Lisbon is Boulder, CO?
Boulder is 7 hours behind Lisbon: UTC−6 against UTC+1.
If it is 9:00 AM in Lisbon, what time is it in Boulder, CO?
At 9:00 AM in Lisbon, clocks in Boulder show 2:00 AM.
What time is it in Boulder, CO, when it is 6:00 PM in Lisbon?
When it is 6:00 PM in Lisbon, it is 11:00 AM in Boulder.
When do working hours in Lisbon and in Boulder, CO, overlap?
Working hours (9:00 AM–6:00 PM) overlap from 4:00 PM to 6:00 PM in Lisbon, which is 9:00 AM to 11:00 AM in Boulder.
Until what time in Lisbon is it still yesterday in Boulder, CO?
Before 7:00 AM in Lisbon, the date in Boulder has not changed yet. From 5:00 PM in Boulder, it is already the next day in Lisbon.
Is the time difference between Lisbon and Boulder, CO, the same all year?
No. Both places use summer time, but they switch on different dates, so for a while the gap changes. From October 25, 2026, Boulder will be 6 hours behind Lisbon.
