Offset
The time difference between Calgary and Chicago is 1 hour.
Calgary (MDT) is behind Chicago (CDT).
MDT: UTC-6
CDT: UTC-5
Both zones are currently observing daylight saving time.
When to schedule
Business-hours overlap: 9 AM–4 PM in Calgary (10 AM–5 PM in Chicago).
Both teams are in working hours during this window on weekdays.
Suggested time: 12:00 PM Calgary (1:00 PM Chicago).
This window may shift by an hour during daylight saving time.
Public holidays in 2026
National public holidays can affect availability — a counterpart is likely off work on their own holidays, so it's worth planning meetings and deadlines around them.
Canada
- New Year's DayThu, Jan 1
- Good FridayFri, Apr 3
- Victoria DayMon, May 18
- Canada DayWed, Jul 1
- Labour DayMon, Sep 7
- National Day for Truth and ReconciliationWed, Sep 30
- ThanksgivingMon, Oct 12
- Christmas DayFri, Dec 25
United States
- New Year's DayThu, Jan 1
- Martin Luther King, Jr. DayMon, Jan 19
- Presidents DayMon, Feb 16
- Memorial DayMon, May 25
- Juneteenth National Independence DayFri, Jun 19
- Independence DayFri, Jul 3
- Labour DayMon, Sep 7
- Columbus DayMon, Oct 12
- Veterans DayWed, Nov 11
- Thanksgiving DayThu, Nov 26
- Christmas DayFri, Dec 25
About these zones
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| Calgary | Chicago | Day |
|---|---|---|
| 12:00 am | 1:00 am | Same day |
| 1:00 am | 2:00 am | Same day |
| 2:00 am | 3:00 am | Same day |
| 3:00 am | 4:00 am | Same day |
| 4:00 am | 5:00 am | Same day |
| 5:00 am | 6:00 am | Same day |
| 6:00 am | 7:00 am | Same day |
| 7:00 am | 8:00 am | Same day |
| 8:00 am | 9:00 am | Same day |
| 9:00 am | 10:00 am | Same day |
| 10:00 am | 11:00 am | Same day |
| 11:00 am | 12:00 pm | Same day |
| 12:00 pm | 1:00 pm | Same day |
| 1:00 pm | 2:00 pm | Same day |
| 2:00 pm | 3:00 pm | Same day |
| 3:00 pm | 4:00 pm | Same day |
| 4:00 pm | 5:00 pm | Same day |
| 5:00 pm | 6:00 pm | Same day |
| 6:00 pm | 7:00 pm | Same day |
| 7:00 pm | 8:00 pm | Same day |
| 8:00 pm | 9:00 pm | Same day |
| 9:00 pm | 10:00 pm | Same day |
| 10:00 pm | 11:00 pm | Same day |
| 11:00 pm | 12:00 am | +1 day |
Daylight saving time
Both Calgary and Chicago observe daylight saving time and transition on the same date.
Next transition: Sunday, November 1, 2026 (fall back).
Because they transition simultaneously, the offset between these zones remains constant year-round.
See the daylight saving time page for transition dates across every time zone.
Daylight today
- Sunrise
- 5:24 AM
- Sunset
- 9:48 PM
- Day length
- 16h 24m
- Sunrise
- 5:17 AM
- Sunset
- 8:24 PM
- Day length
- 15h 7m
Daylight overlap: 14h — 5:24 AM–7:24 PM in Calgary (6:24 AM–8:24 PM in Chicago). Both locations are in daylight during this window.
Cities in these zones
Other cities in Mountain Time
Other cities in Central Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Mountain Time
- YYC
- YEG
Airports in Central Time
- GYY
- MDW
- ORD
- HOU
- IAH
- SAT
- DAL
- DFW
- AUS
- BNA
Related conversions
Common conversions
- What is 9:00 am Calgary in Chicago?
- 9:00 am Calgary is 10:00 am Chicago.
- What is 12:00 pm Calgary in Chicago?
- 12:00 pm Calgary is 1:00 pm Chicago.
- What is 12:30 pm Calgary in Chicago?
- 12:30 pm Calgary is 1:30 pm Chicago.
- What is 2:00 pm Calgary in Chicago?
- 2:00 pm Calgary is 3:00 pm Chicago.
- What is 5:00 pm Calgary in Chicago?
- 5:00 pm Calgary is 6:00 pm Chicago.
- What is 11:30 pm Calgary in Chicago?
- 11:30 pm Calgary is 12:30 am Chicago, the next day.