Observatory log
Chicago and Tumby Bay, compared
- 01Difference now
Tumby Bay is 15 hours 30 minutes ahead of Chicago.
Chicago: CDT (UTC−5) · Tumby Bay: ACDT (UTC+10:30)
Next changeFrom 1 November 2026: Tumby Bay is 16 hours 30 minutes ahead of Chicago.
- 02Through 2026–2027
- 1 January 2026 – 8 March 2026+16 h 30 min
- 8 March 2026 – 5 April 2026+15 h 30 min
- 5 April 2026 – 4 October 2026+14 h 30 min
- 4 October 2026 – 1 November 2026+15 h 30 min
- 1 November 2026 – 14 March 2027+16 h 30 min
- 14 March 2027 – 4 April 2027+15 h 30 min
- 4 April 2027 – 3 October 2027+14 h 30 min
- 3 October 2027 – 7 November 2027+15 h 30 min
- 7 November 2027 – 31 December 2027+16 h 30 min
Difference of Tumby Bay 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
17:30–22:00 in Chicago = 09:00–13:30 in Tumby Bay
No shared office hours: this is early or late for one side (Mon–Thu).
Also possible: Mon–Thu: 14:30–17:00 in Chicago = 06:00–08:30 in Tumby Bay (tomorrow) · 2 h 30 min.
- 05Weekend
Chicago: Saturday and Sunday
Tumby Bay: Saturday and Sunday
24 hours
A day in Chicago, in Tumby Bay
| Chicago | Tumby Bay | Working hours, evening, night or weekend in each place |
|---|---|---|
| 00:00 | 15:30 | |
| 01:00 | 16:30 | |
| 02:00 | 17:30 | |
| 03:00 | 18:30 | |
| 04:00 | 19:30 | |
| 05:00 | 20:30 | |
| 06:00 | 21:30 | |
| 07:00 | 22:30 | |
| 08:00 | 23:30 | |
| 09:00 | 00:30Tomorrow | |
| 10:00 | 01:30Tomorrow | |
| 11:00 | 02:30Tomorrow | |
| 12:00 | 03:30Tomorrow | |
| 13:00 | 04:30Tomorrow | |
| 14:00 | 05:30Tomorrow | |
| 15:00 | 06:30Tomorrow | |
| 16:00 | 07:30Tomorrow | |
| 17:00 | 08:30Tomorrow | |
| 18:00 | 09:30Tomorrow | |
| 19:00 | 10:30Tomorrow | |
| 20:00 | 11:30Tomorrow | |
| 21:00 | 12:30Tomorrow | |
| 22:00 | 13:30Tomorrow | |
| 23:00 | 14:30Tomorrow |
Working hoursEarly or eveningNightWeekend
Plan a meeting: Chicago and Tumby Bay
More time differences with Chicago
Questions
Asked about Chicago and Tumby Bay
What is the time difference between Chicago and Tumby Bay?
Tumby Bay is 15 hours 30 minutes ahead of Chicago. This holds until 1 November 2026; then Tumby Bay is 16 hours 30 minutes ahead of Chicago.
What is the best time for a call between Chicago and Tumby Bay?
No shared office hours. The least awkward windows, early or late for one side: Mon–Thu: 17:30–22:00 in Chicago = 09:00–13:30 in Tumby Bay (tomorrow) · 4 h 30 min; Mon–Thu: 14:30–17:00 in Chicago = 06:00–08:30 in Tumby Bay (tomorrow) · 2 h 30 min.
When does the time difference between Chicago and Tumby Bay change?
In the next 12 months it changes on: 1 November 2026 (+16 h 30 min); 14 March 2027 (+15 h 30 min); 4 April 2027 (+14 h 30 min); 3 October 2027 (+15 h 30 min).