Phuket to Boulder, CO: time difference
Boulder, CO is 13 h behind Phuket. 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.
Phuket 00:46 12:46 AM Boulder, CO 11:46 11:46 AM You –:–
00:46 12:46 AM
Indochina Time · UTC+7
☀️ 06:14 · 🌙 18:09
11:46 11:46 AM
Mountain Daylight Time · UTC-6
☀️ 07:19 · 🌙 18:17
·
−13 h
Boulder, CO is 13 h behind Phuket.
When you, Phuket 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
🇹🇭 Phuket
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
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 3 3 AM 4 4 AM 5 5 AM 6 6 AM 7 7 AM 8 8 AM 9 9 AM 10 10 AM
📍 Your time
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇹🇭 Phuket | 🇺🇸 Boulder, CO |
|---|---|---|
| Local time | 00:46 | 11:46 |
| Local date | Wednesday, October 21, 2026 | Tuesday, October 20, 2026 |
| Time zone | Indochina Time | Mountain Daylight Time |
| UTC offset | UTC+7 | UTC-6 |
| Offset from Phuket | — | −13 h |
| IANA zone | Asia/Bangkok | America/Denver |
| Daylight saving | Not observed | On summer time → UTC-7, Nov 1, 01:00 |
| Sunrise | 06:14 | 07:19 |
| Sunset | 18:09 | 18:17 |
| Daylight | 11 h 55 min | 10 h 58 min |
| People on this clock | 79,308 | 106,803 |
Compare Phuket with another city
More comparisons with Phuket: the time zones next to it and the far side of the clock.
Big time differences
Phuket and Boulder, CO: common questions
How far behind Phuket is Boulder, CO?
Boulder is 13 hours behind Phuket: UTC−6 against UTC+7.
What time is it in Boulder, CO, at the start of the working day in Phuket?
The working day in Phuket starts at 9:00 AM; in Boulder it is 8:00 PM (the previous day) at that moment.
What time is it in Boulder, CO, at the end of the working day in Phuket?
The working day in Phuket ends at 6:00 PM; in Boulder it is 5:00 AM at that moment.
Is there a time when both Phuket and Boulder, CO, are at work?
No, the working days (9:00 AM–6:00 PM) do not overlap. When the day starts in Phuket at 9:00 AM, it is 8:00 PM (the previous day) in Boulder; the day in Boulder starts at 10:00 PM in Phuket time.
When is it still the previous day in Boulder, CO?
Until 1:00 PM in Phuket it is still the previous day in Boulder. The other way round, from 11:00 AM in Boulder it is already the next day in Phuket.
Does the time difference between Phuket and Boulder, CO, change?
Yes. The clocks change only in Boulder. From November 1, 2026, Boulder will be 14 hours behind Phuket.
