Observatory log
Chicago and Tomakomai, compared
- 01Difference now
Tomakomai is 14 hours ahead of Chicago.
Chicago: CDT (UTC−5) · Tomakomai: JST (UTC+9)
Next changeFrom 1 November 2026: Tomakomai is 15 hours ahead of Chicago.
- 02Through 2026–2027
- 1 January 2026 – 8 March 2026+15 h
- 8 March 2026 – 1 November 2026+14 h
- 1 November 2026 – 14 March 2027+15 h
- 14 March 2027 – 7 November 2027+14 h
- 7 November 2027 – 31 December 2027+15 h
Difference of Tomakomai from Chicago. 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 Chicago = 09:00–12:00 in Tomakomai
No shared office hours: this is early or late for one side (Mon–Thu).
Also possible: Mon–Thu: 16:00–17:00 in Chicago = 06:00–07:00 in Tomakomai (tomorrow) · 1 h.
- 05Weekend
Chicago: Saturday and Sunday
Tomakomai: Saturday and Sunday
24 hours
A day in Chicago, in Tomakomai
| Chicago | Tomakomai | Working hours, evening, night or weekend in each place |
|---|---|---|
| 00:00 | 14:00 | |
| 01:00 | 15:00 | |
| 02:00 | 16:00 | |
| 03:00 | 17:00 | |
| 04:00 | 18:00 | |
| 05:00 | 19:00 | |
| 06:00 | 20:00 | |
| 07:00 | 21:00 | |
| 08:00 | 22:00 | |
| 09:00 | 23:00 | |
| 10:00 | 00:00Tomorrow | |
| 11:00 | 01:00Tomorrow | |
| 12:00 | 02:00Tomorrow | |
| 13:00 | 03:00Tomorrow | |
| 14:00 | 04:00Tomorrow | |
| 15:00 | 05:00Tomorrow | |
| 16:00 | 06:00Tomorrow | |
| 17:00 | 07:00Tomorrow | |
| 18:00 | 08:00Tomorrow | |
| 19:00 | 09:00Tomorrow | |
| 20:00 | 10:00Tomorrow | |
| 21:00 | 11:00Tomorrow | |
| 22:00 | 12:00Tomorrow | |
| 23:00 | 13:00Tomorrow |
Working hoursEarly or eveningNightWeekend
Plan a meeting: Chicago and Tomakomai
More time differences with Chicago
Questions
Asked about Chicago and Tomakomai
What is the time difference between Chicago and Tomakomai?
Tomakomai is 14 hours ahead of Chicago. This holds until 1 November 2026; then Tomakomai is 15 hours ahead of Chicago.
What is the best time for a call between Chicago and Tomakomai?
No shared office hours. The least awkward windows, early or late for one side: Mon–Thu: 19:00–22:00 in Chicago = 09:00–12:00 in Tomakomai (tomorrow) · 3 h; Mon–Thu: 16:00–17:00 in Chicago = 06:00–07:00 in Tomakomai (tomorrow) · 1 h.
When does the time difference between Chicago and Tomakomai change?
In the next 12 months it changes on: 1 November 2026 (+15 h); 14 March 2027 (+14 h).