Chiang Mai to Boston, MA: time difference
Boston, MA is 11 h behind Chiang Mai. 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.
Chiang Mai 08:09 8:09 AM Boston, MA 21:09 9:09 PM You –:–
08:09 8:09 AM
Indochina Time · UTC+7
☀️ 06:17 · 🌙 18:07
21:09 9:09 PM
Eastern Daylight Time · UTC-4
☀️ 06:51 · 🌙 18:14
·
−11 h
Boston, MA is 11 h behind Chiang Mai.
When you, Chiang Mai and Boston, MA are all at the desk
Pick the working hours below – the window every location shares appears once your time zone is known.
Working hours
🇹🇭 Chiang Mai
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
🇺🇸 Boston, MA
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
- Asleep
- Early
- Working hours
- Evening
- Both working
- Right now
Time zones side by side
| Detail | 🇹🇭 Chiang Mai | 🇺🇸 Boston, MA |
|---|---|---|
| Local time | 08:09 | 21:09 |
| Local date | Saturday, October 10, 2026 | Friday, October 9, 2026 |
| Time zone | Indochina Time | Eastern Daylight Time |
| UTC offset | UTC+7 | UTC-4 |
| Offset from Chiang Mai | — | −11 h |
| IANA zone | Asia/Bangkok | America/New York |
| Daylight saving | Not observed | On summer time → UTC-5, Nov 1, 01:00 |
| Sunrise | 06:17 | 06:51 |
| Sunset | 18:07 | 18:14 |
| Daylight | 11 h 49 min | 11 h 23 min |
| People on this clock | 127,240 | 675,647 |
Compare Chiang Mai with another city
More comparisons with Chiang Mai: the time zones next to it and the far side of the clock.
Big time differences
Chiang Mai and Boston, MA: common questions
How many hours behind Chiang Mai is Boston, MA?
The clocks in Boston are 11 hours behind those in Chiang Mai (UTC−4 and UTC+7).
What time is it in Boston, MA, at the start of the working day in Chiang Mai?
The working day in Chiang Mai starts at 9:00 AM; in Boston it is 10:00 PM (the previous day) at that moment.
What time is it in Boston, MA, when it is 6:00 PM in Chiang Mai?
When it is 6:00 PM in Chiang Mai, it is 7:00 AM in Boston.
When do working hours in Chiang Mai and in Boston, MA, overlap?
They don't: there are no shared working hours. The start of the day in Chiang Mai (9:00 AM) is 10:00 PM (the previous day) in Boston, and the start of the day in Boston is 8:00 PM in Chiang Mai.
Until what time in Chiang Mai is it still yesterday in Boston, MA?
Before 11:00 AM in Chiang Mai, the date in Boston has not changed yet. From 1:00 PM in Boston, it is already the next day in Chiang Mai.
Does the time difference between Chiang Mai and Boston, MA, change?
Yes. The clocks change only in Boston. From November 1, 2026, Boston will be 12 hours behind Chiang Mai.
