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