Observatory log
Tokyo and Chonchi, compared
- 01Difference now
Chonchi is 12 hours behind Tokyo.
Tokyo: JST (UTC+9) · Chonchi: UTC−3 (UTC−3)
Next changeFrom 3 April 2027: Chonchi is 13 hours behind Tokyo.
- 02Through 2026–2027
- 1 January 2026 – 4 April 2026−12 h
- 4 April 2026 – 6 September 2026−13 h
- 6 September 2026 – 3 April 2027−12 h
- 3 April 2027 – 5 September 2027−13 h
- 5 September 2027 – 31 December 2027−12 h
Difference of Chonchi 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 Chonchi
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 Chonchi (yesterday) · 1 h.
- 05Weekend
Tokyo: Saturday and Sunday
Chonchi: Saturday and Sunday
24 hours
A day in Tokyo, in Chonchi
| Tokyo | Chonchi | 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 Chonchi
More time differences with Tokyo
Questions
Asked about Tokyo and Chonchi
What is the time difference between Tokyo and Chonchi?
Chonchi is 12 hours behind Tokyo. This holds until 3 April 2027; then Chonchi is 13 hours behind Tokyo.
What is the best time for a call between Tokyo and Chonchi?
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 Chonchi · 1 h; Tue–Fri: 09:00–10:00 in Tokyo = 21:00–22:00 in Chonchi (yesterday) · 1 h.
When does the time difference between Tokyo and Chonchi change?
In the next 12 months it changes on: 3 April 2027 (−13 h); 5 September 2027 (−12 h).