Boulder, CO to Phuket: time difference
Phuket is 13 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 11:40 11:40 AM Phuket 00:40 12:40 AM You –:–
11:40 11:40 AM
Mountain Daylight Time · UTC-6
☀️ 07:19 · 🌙 18:17
00:40 12:40 AM
Indochina Time · UTC+7
☀️ 06:14 · 🌙 18:09
·
+13 h
Phuket is 13 h ahead of Boulder, CO.
When you, Boulder, CO and Phuket 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
🇹🇭 Phuket
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 11 11 AM 12 12 PM
📍 Your time
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Time zones side by side
| Detail | 🇺🇸 Boulder, CO | 🇹🇭 Phuket |
|---|---|---|
| Local time | 11:40 | 00:40 |
| Local date | Tuesday, October 20, 2026 | Wednesday, October 21, 2026 |
| Time zone | Mountain Daylight Time | Indochina Time |
| UTC offset | UTC-6 | UTC+7 |
| Offset from Boulder, CO | — | +13 h |
| IANA zone | America/Denver | Asia/Bangkok |
| Daylight saving | On summer time → UTC-7, Nov 1, 01:00 | Not observed |
| Sunrise | 07:19 | 06:14 |
| Sunset | 18:17 | 18:09 |
| Daylight | 10 h 58 min | 11 h 55 min |
| People on this clock | 106,803 | 79,308 |
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 Phuket: common questions
How many hours ahead of Boulder, CO, is Phuket?
The clocks in Phuket are 13 hours ahead of those in Boulder (UTC+7 and UTC−6).
What time is it in Phuket at the start of the working day in Boulder, CO?
The working day in Boulder starts at 9:00 AM; in Phuket it is 10:00 PM at that moment.
What time is it in Phuket when it is 6:00 PM in Boulder, CO?
When it is 6:00 PM in Boulder, it is 7:00 AM (the next day) in Phuket.
When do working hours in Boulder, CO, and in Phuket overlap?
They don't: there are no shared working hours. The start of the day in Boulder (9:00 AM) is 10:00 PM in Phuket, and the start of the day in Phuket is 8:00 PM (the previous day) in Boulder.
When is it already the next day in Phuket?
From 11:00 AM in Boulder, CO, it is already the next day in Phuket. The other way round, until 1:00 PM in Phuket it is still the previous day in Boulder.
Is the time difference between Boulder, CO, and Phuket the same all year?
No. Only Boulder switches to summer time, so the gap changes twice a year. From November 1, 2026, Phuket will be 14 hours ahead of Boulder.
