San Jose to Boulder, CO: time difference
Boulder, CO is 1 h behind San Jose. 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.
San Jose 03:07 3:07 AM Boulder, CO 02:07 2:07 AM You –:–
03:07 3:07 AM
Central Standard Time · UTC-6
☀️ 05:29 · 🌙 17:13
02:07 2:07 AM
Mountain Standard Time · UTC-7
☀️ 06:38 · 🌙 16:56
·
−1 h
Boulder, CO is 1 h behind San Jose.
When you, San Jose 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
🇨🇷 San Jose
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
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 21 9 PM 22 10 PM
📍 Your time
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇨🇷 San Jose | 🇺🇸 Boulder, CO |
|---|---|---|
| Local time | 03:07 | 02:07 |
| Local date | Friday, November 6, 2026 | Friday, November 6, 2026 |
| Time zone | Central Standard Time | Mountain Standard Time |
| UTC offset | UTC-6 | UTC-7 |
| Offset from San Jose | — | −1 h |
| IANA zone | America/Costa Rica | America/Denver |
| Daylight saving | Not observed | On standard time → UTC-6, Mar 14, 03:00 |
| Sunrise | 05:29 | 06:38 |
| Sunset | 17:13 | 16:56 |
| Daylight | 11 h 44 min | 10 h 18 min |
| People on this clock | 342,188 | 106,803 |
Compare San Jose with another city
More comparisons with San Jose: the time zones next to it and the far side of the clock.
Nearby time zones
Big time differences
San Jose and Boulder, CO: common questions
What is the time difference between San Jose and Boulder, CO?
Boulder is 1 hour behind: it uses UTC−7, while San Jose is on UTC−6.
What time is it in Boulder, CO, at the start of the working day in San Jose?
The working day in San Jose starts at 9:00 AM; in Boulder it is 8:00 AM at that moment.
What time is it in Boulder, CO, at the end of the working day in San Jose?
The working day in San Jose ends at 6:00 PM; in Boulder it is 5:00 PM at that moment.
Is there a time when both San Jose and Boulder, CO, are at work?
Yes: from 10:00 AM to 6:00 PM in San Jose (9:00 AM to 5:00 PM in Boulder), the working days (9:00 AM–6:00 PM) overlap.
When is it still the previous day in Boulder, CO?
Until 1:00 AM in San Jose it is still the previous day in Boulder. The other way round, from 11:00 PM in Boulder it is already the next day in San Jose.
Does the time difference between San Jose and Boulder, CO, change?
Yes. The clocks change only in Boulder. From March 14, 2027, Boulder and San Jose will have the same time.
