Observatory log
Chicago and Ansan, compared
- 01Difference now
Ansan is 14 hours ahead of Chicago.
Chicago: CDT (UTC−5) · Ansan: KST (UTC+9)
Next changeFrom 1 November 2026: Ansan 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 Ansan 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 Ansan
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 Ansan (tomorrow) · 1 h.
- 05Weekend
Chicago: Saturday and Sunday
Ansan: Saturday and Sunday
24 hours
A day in Chicago, in Ansan
| Chicago | Ansan | 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 Ansan
More time differences with Chicago
Questions
Asked about Chicago and Ansan
What is the time difference between Chicago and Ansan?
Ansan is 14 hours ahead of Chicago. This holds until 1 November 2026; then Ansan is 15 hours ahead of Chicago.
What is the best time for a call between Chicago and Ansan?
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 Ansan (tomorrow) · 3 h; Mon–Thu: 16:00–17:00 in Chicago = 06:00–07:00 in Ansan (tomorrow) · 1 h.
When does the time difference between Chicago and Ansan change?
In the next 12 months it changes on: 1 November 2026 (+15 h); 14 March 2027 (+14 h).