Observatory log
Chicago and Yen Bai, compared
- 01Difference now
Yen Bai is 12 hours ahead of Chicago.
Chicago: CDT (UTC−5) · Yen Bai: UTC+7 (UTC+7)
Next changeFrom 1 November 2026: Yen Bai 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 Yen Bai 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 Yen Bai
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 Yen Bai (tomorrow) · 1 h.
- 05Weekend
Chicago: Saturday and Sunday
Yen Bai: Saturday and Sunday
24 hours
A day in Chicago, in Yen Bai
| Chicago | Yen Bai | 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 Yen Bai
More time differences with Chicago
Questions
Asked about Chicago and Yen Bai
What is the time difference between Chicago and Yen Bai?
Yen Bai is 12 hours ahead of Chicago. This holds until 1 November 2026; then Yen Bai is 13 hours ahead of Chicago.
What is the best time for a call between Chicago and Yen Bai?
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 Yen Bai · 1 h; Mon–Thu: 21:00–22:00 in Chicago = 09:00–10:00 in Yen Bai (tomorrow) · 1 h.
When does the time difference between Chicago and Yen Bai change?
In the next 12 months it changes on: 1 November 2026 (+13 h); 14 March 2027 (+12 h).