Observatory log
Chicago and Ust Kut, compared
- 01Difference now
Ust Kut is 13 hours ahead of Chicago.
Chicago: CDT (UTC−5) · Ust Kut: UTC+8 (UTC+8)
Next changeFrom 1 November 2026: Ust Kut is 14 hours ahead of Chicago.
- 02Through 2026–2027
- 1 January 2026 – 8 March 2026+14 h
- 8 March 2026 – 1 November 2026+13 h
- 1 November 2026 – 14 March 2027+14 h
- 14 March 2027 – 7 November 2027+13 h
- 7 November 2027 – 31 December 2027+14 h
Difference of Ust Kut 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
20:00–22:00 in Chicago = 09:00–11:00 in Ust Kut
No shared office hours: this is early or late for one side (Mon–Thu).
- 05Weekend
Chicago: Saturday and Sunday
Ust Kut: Saturday and Sunday
24 hours
A day in Chicago, in Ust Kut
| Chicago | Ust Kut | Working hours, evening, night or weekend in each place |
|---|---|---|
| 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 | 00:00Tomorrow | |
| 12:00 | 01:00Tomorrow | |
| 13:00 | 02:00Tomorrow | |
| 14:00 | 03:00Tomorrow | |
| 15:00 | 04:00Tomorrow | |
| 16:00 | 05:00Tomorrow | |
| 17:00 | 06:00Tomorrow | |
| 18:00 | 07:00Tomorrow | |
| 19:00 | 08:00Tomorrow | |
| 20:00 | 09:00Tomorrow | |
| 21:00 | 10:00Tomorrow | |
| 22:00 | 11:00Tomorrow | |
| 23:00 | 12:00Tomorrow |
Working hoursEarly or eveningNightWeekend
Plan a meeting: Chicago and Ust Kut
More time differences with Chicago
Questions
Asked about Chicago and Ust Kut
What is the time difference between Chicago and Ust Kut?
Ust Kut is 13 hours ahead of Chicago. This holds until 1 November 2026; then Ust Kut is 14 hours ahead of Chicago.
What is the best time for a call between Chicago and Ust Kut?
No shared office hours. The least awkward windows, early or late for one side: Mon–Thu: 20:00–22:00 in Chicago = 09:00–11:00 in Ust Kut (tomorrow) · 2 h.
When does the time difference between Chicago and Ust Kut change?
In the next 12 months it changes on: 1 November 2026 (+14 h); 14 March 2027 (+13 h).