Offset
The time difference between Riyadh and Calgary is 9 hours.
Riyadh (AST) is ahead of Calgary (MDT).
AST: UTC+3
MDT: UTC-6
Calgary is currently observing daylight saving time; Riyadh is not.
When to schedule
Standard business hours (9 AM–5 PM, Mon–Fri) in Riyadh and Calgary don't overlap on the same weekday. Calgary is 9 hours behind Riyadh.
With some flexibility, there’s a workable window outside standard hours:
- 4 PM–8 PM in Riyadh (7 AM–11 AM in Calgary) — suggest 6:00 PM Riyadh (9:00 AM Calgary).
This means an early start or late finish for one side, but it’s a reasonable slot for a one-off meeting.
This window may shift by an hour during daylight saving time.
Note: the working week in Saudi Arabia runs Sunday–Thursday; Friday–Saturday is the weekend, so overlap on those days is limited.
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
About these zones
Quick reference
Full 24-hour conversion table — tap any time to open it in the converter.
| Riyadh | Calgary | Day |
|---|---|---|
| 12:00 am | 3:00 pm | -1 day |
| 1:00 am | 4:00 pm | -1 day |
| 2:00 am | 5:00 pm | -1 day |
| 3:00 am | 6:00 pm | -1 day |
| 4:00 am | 7:00 pm | -1 day |
| 5:00 am | 8:00 pm | -1 day |
| 6:00 am | 9:00 pm | -1 day |
| 7:00 am | 10:00 pm | -1 day |
| 8:00 am | 11:00 pm | -1 day |
| 9:00 am | 12:00 am | Same day |
| 10:00 am | 1:00 am | Same day |
| 11:00 am | 2:00 am | Same day |
| 12:00 pm | 3:00 am | Same day |
| 1:00 pm | 4:00 am | Same day |
| 2:00 pm | 5:00 am | Same day |
| 3:00 pm | 6:00 am | Same day |
| 4:00 pm | 7:00 am | Same day |
| 5:00 pm | 8:00 am | Same day |
| 6:00 pm | 9:00 am | Same day |
| 7:00 pm | 10:00 am | Same day |
| 8:00 pm | 11:00 am | Same day |
| 9:00 pm | 12:00 pm | Same day |
| 10:00 pm | 1:00 pm | Same day |
| 11:00 pm | 2:00 pm | Same day |
Daylight saving time
Calgary observes daylight saving time; Riyadh does not. The offset between the two zones changes when Calgary transitions: on Sunday, November 1, 2026, clocks fall back from MDT to MST.
See the daylight saving time page for transition dates across every time zone.
Daylight today
- Sunrise
- 5:04 AM
- Sunset
- 6:42 PM
- Day length
- 13h 37m
- Sunrise
- 5:24 AM
- Sunset
- 9:48 PM
- Day length
- 16h 24m
Daylight overlap: 1h 44m — 5:04 AM–6:48 AM in Riyadh (8:04 PM–9:48 PM in Calgary). Both locations are in daylight during this window.
Cities in these zones
Other cities in Mountain Time
Browse all cities to see the current local time anywhere.
Airports in these zones
Airports in Arabia Standard Time
- JED
- RUH
- MED
- DMM
Airports in Mountain Time
- YYC
- YEG
Related conversions
Common conversions
- What is 9:00 am Riyadh in Calgary?
- 9:00 am Riyadh is 12:00 am Calgary.
- What is 12:00 pm Riyadh in Calgary?
- 12:00 pm Riyadh is 3:00 am Calgary.
- What is 12:30 pm Riyadh in Calgary?
- 12:30 pm Riyadh is 3:30 am Calgary.
- What is 2:00 pm Riyadh in Calgary?
- 2:00 pm Riyadh is 5:00 am Calgary.
- What is 5:00 pm Riyadh in Calgary?
- 5:00 pm Riyadh is 8:00 am Calgary.
- What is 11:30 pm Riyadh in Calgary?
- 11:30 pm Riyadh is 2:30 pm Calgary.