Offset
The time difference between Calgary and Greenwich Mean Time is 7 hours.
Calgary (MDT) is behind Greenwich Mean Time (BST).
MDT: UTC-6
BST: UTC+1
Both zones are currently observing daylight saving time.
When to schedule
Business-hours overlap: 9 AM–10 AM in Calgary (4 PM–5 PM in Greenwich Mean Time).
Both teams are in working hours during this window on weekdays.
Suggested time: 9:00 AM Calgary (4:00 PM Greenwich Mean Time).
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 Kingdom
- Good FridayFri, Apr 3
- Early May Bank HolidayMon, May 4
- Spring Bank HolidayMon, May 25
- Christmas DayFri, Dec 25
- St. Stephen's DayMon, Dec 28
About these zones
Calgary uses Mountain Time (MST, or MDT). To call Canada, dial +1.
Greenwich Mean Time is also known as GMT, or BST. To call United Kingdom, dial +44.
Greenwich Mean Time is approximately 4,350 miles northeast of Calgary.
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| Calgary | GMT | Day |
|---|---|---|
| 12:00 am | 7:00 am | Same day |
| 1:00 am | 8:00 am | Same day |
| 2:00 am | 9:00 am | Same day |
| 3:00 am | 10:00 am | Same day |
| 4:00 am | 11:00 am | Same day |
| 5:00 am | 12:00 pm | Same day |
| 6:00 am | 1:00 pm | Same day |
| 7:00 am | 2:00 pm | Same day |
| 8:00 am | 3:00 pm | Same day |
| 9:00 am | 4:00 pm | Same day |
| 10:00 am | 5:00 pm | Same day |
| 11:00 am | 6:00 pm | Same day |
| 12:00 pm | 7:00 pm | Same day |
| 1:00 pm | 8:00 pm | Same day |
| 2:00 pm | 9:00 pm | Same day |
| 3:00 pm | 10:00 pm | Same day |
| 4:00 pm | 11:00 pm | Same day |
| 5:00 pm | 12:00 am | +1 day |
| 6:00 pm | 1:00 am | +1 day |
| 7:00 pm | 2:00 am | +1 day |
| 8:00 pm | 3:00 am | +1 day |
| 9:00 pm | 4:00 am | +1 day |
| 10:00 pm | 5:00 am | +1 day |
| 11:00 pm | 6:00 am | +1 day |
Daylight saving time
Both zones observe daylight saving time, but they transition on different dates.
Calgary: next transition on Sunday, November 1, 2026.
Greenwich Mean Time: next transition on Sunday, October 25, 2026.
For approximately 7 days between transitions, the offset between Calgary and Greenwich Mean Time differs from its typical value. Recurring meetings during this window will shift by one hour.
See the daylight saving time page for transition dates across every time zone.
Daylight today
- Sunrise
- 5:25 AM
- Sunset
- 9:46 PM
- Day length
- 16h 21m
- Sunrise
- 4:47 AM
- Sunset
- 9:13 PM
- Day length
- 16h 25m
Daylight overlap: 8h 47m — 5:25 AM–2:13 PM in Calgary (12:25 PM–9:13 PM in Greenwich Mean Time). Both locations are in daylight during this window.
Cities in these zones
Other cities in Mountain Time
Cities in Greenwich Mean Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Mountain Time
- YYC
- YEG
Airports in Greenwich Mean Time
- LCY
- LGW
- LHR
- LTN
- STN
- BHX
- EMA
- GLA
- PIK
- LBA
Related conversions
Common conversions
- What is 9:00 am Calgary in GMT?
- 9:00 am Calgary is 4:00 pm GMT.
- What is 12:00 pm Calgary in GMT?
- 12:00 pm Calgary is 7:00 pm GMT.
- What is 12:30 pm Calgary in GMT?
- 12:30 pm Calgary is 7:30 pm GMT.
- What is 2:00 pm Calgary in GMT?
- 2:00 pm Calgary is 9:00 pm GMT.
- What is 5:00 pm Calgary in GMT?
- 5:00 pm Calgary is 12:00 am GMT, the next day.
- What is 11:30 pm Calgary in GMT?
- 11:30 pm Calgary is 6:30 am GMT, the next day.