Observatory log
Tokyo and Ilulissat, compared
- 01Difference now
Ilulissat is 10 hours behind Tokyo.
Tokyo: JST (UTC+9) · Ilulissat: UTC−1 (UTC−1)
Next changeFrom 24 October 2026: Ilulissat is 11 hours behind Tokyo.
- 02Through 2026–2027
- 1 January 2026 – 29 March 2026−11 h
- 29 March 2026 – 24 October 2026−10 h
- 24 October 2026 – 28 March 2027−11 h
- 28 March 2027 – 30 October 2027−10 h
- 30 October 2027 – 31 December 2027−11 h
Difference of Ilulissat 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
19:00–22:00 in Tokyo = 09:00–12:00 in Ilulissat
No shared office hours: this is early or late for one side (Mon–Fri).
Also possible: Mon–Fri: 16:00–17:00 in Tokyo = 06:00–07:00 in Ilulissat · 1 h.
- 05Weekend
Tokyo: Saturday and Sunday
Ilulissat: Saturday and Sunday
24 hours
A day in Tokyo, in Ilulissat
| Tokyo | Ilulissat | Working hours, evening, night or weekend in each place |
|---|---|---|
| 00:00 | 14:00Yesterday | |
| 01:00 | 15:00Yesterday | |
| 02:00 | 16:00Yesterday | |
| 03:00 | 17:00Yesterday | |
| 04:00 | 18:00Yesterday | |
| 05:00 | 19:00Yesterday | |
| 06:00 | 20:00Yesterday | |
| 07:00 | 21:00Yesterday | |
| 08:00 | 22:00Yesterday | |
| 09:00 | 23:00Yesterday | |
| 10:00 | 00:00 | |
| 11:00 | 01:00 | |
| 12:00 | 02:00 | |
| 13:00 | 03:00 | |
| 14:00 | 04:00 | |
| 15:00 | 05:00 | |
| 16:00 | 06:00 | |
| 17:00 | 07:00 | |
| 18:00 | 08:00 | |
| 19:00 | 09:00 | |
| 20:00 | 10:00 | |
| 21:00 | 11:00 | |
| 22:00 | 12:00 | |
| 23:00 | 13:00 |
Working hoursEarly or eveningNightWeekend
Plan a meeting: Tokyo and Ilulissat
More time differences with Tokyo
Questions
Asked about Tokyo and Ilulissat
What is the time difference between Tokyo and Ilulissat?
Ilulissat is 10 hours behind Tokyo. This holds until 24 October 2026; then Ilulissat is 11 hours behind Tokyo.
What is the best time for a call between Tokyo and Ilulissat?
No shared office hours. The least awkward windows, early or late for one side: Mon–Fri: 19:00–22:00 in Tokyo = 09:00–12:00 in Ilulissat · 3 h; Mon–Fri: 16:00–17:00 in Tokyo = 06:00–07:00 in Ilulissat · 1 h.
When does the time difference between Tokyo and Ilulissat change?
In the next 12 months it changes on: 24 October 2026 (−11 h); 28 March 2027 (−10 h).