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