Observatory log
Tokyo and Amherst, compared
- 01Difference now
Amherst is 12 hours behind Tokyo.
Tokyo: JST (UTC+9) · Amherst: ADT (UTC−3)
Next changeFrom 1 November 2026: Amherst is 13 hours behind Tokyo.
- 02Through 2026–2027
- 1 January 2026 – 8 March 2026−13 h
- 8 March 2026 – 1 November 2026−12 h
- 1 November 2026 – 14 March 2027−13 h
- 14 March 2027 – 7 November 2027−12 h
- 7 November 2027 – 31 December 2027−13 h
Difference of Amherst from Tokyo. It changes on the days either place changes its clocks (dates local to that place).
- 03Shared working hours
Their working days never overlap.
Counted as 09:00–17:00 local time on each place’s own working days, for the next seven days.
- 04Best time to meet
21:00–22:00 in Tokyo = 09:00–10:00 in Amherst
No shared office hours: this is early or late for one side (Mon–Fri).
Also possible: Tue–Fri: 09:00–10:00 in Tokyo = 21:00–22:00 in Amherst (yesterday) · 1 h.
- 05Weekend
Tokyo: Saturday and Sunday
Amherst: Saturday and Sunday
24 hours
A day in Tokyo, in Amherst
| Tokyo | Amherst | Working hours, evening, night or weekend in each place |
|---|---|---|
| 00:00 | 12:00Yesterday | |
| 01:00 | 13:00Yesterday | |
| 02:00 | 14:00Yesterday | |
| 03:00 | 15:00Yesterday | |
| 04:00 | 16:00Yesterday | |
| 05:00 | 17:00Yesterday | |
| 06:00 | 18:00Yesterday | |
| 07:00 | 19:00Yesterday | |
| 08:00 | 20:00Yesterday | |
| 09:00 | 21:00Yesterday | |
| 10:00 | 22:00Yesterday | |
| 11:00 | 23:00Yesterday | |
| 12:00 | 00:00 | |
| 13:00 | 01:00 | |
| 14:00 | 02:00 | |
| 15:00 | 03:00 | |
| 16:00 | 04:00 | |
| 17:00 | 05:00 | |
| 18:00 | 06:00 | |
| 19:00 | 07:00 | |
| 20:00 | 08:00 | |
| 21:00 | 09:00 | |
| 22:00 | 10:00 | |
| 23:00 | 11:00 |
Working hoursEarly or eveningNightWeekend
Plan a meeting: Tokyo and Amherst
More time differences with Tokyo
Questions
Asked about Tokyo and Amherst
What is the time difference between Tokyo and Amherst?
Amherst is 12 hours behind Tokyo. This holds until 1 November 2026; then Amherst is 13 hours behind Tokyo.
What is the best time for a call between Tokyo and Amherst?
No shared office hours. The least awkward windows, early or late for one side: Mon–Fri: 21:00–22:00 in Tokyo = 09:00–10:00 in Amherst · 1 h; Tue–Fri: 09:00–10:00 in Tokyo = 21:00–22:00 in Amherst (yesterday) · 1 h.
When does the time difference between Tokyo and Amherst change?
In the next 12 months it changes on: 1 November 2026 (−13 h); 14 March 2027 (−12 h).