Offset
The time difference between Riyadh and Ottawa is 7 hours.
Riyadh (AST) is ahead of Ottawa (EDT).
AST: UTC+3
EDT: UTC-4
Ottawa is currently observing daylight saving time; Riyadh is not.
When to schedule
Business-hours overlap: 4 PM–5 PM in Riyadh (9 AM–10 AM in Ottawa).
Both teams are in working hours during this window on weekdays.
Suggested time: 4:00 PM Riyadh (9:00 AM Ottawa).
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 | Ottawa | Day |
|---|---|---|
| 12:00 am | 5:00 pm | -1 day |
| 1:00 am | 6:00 pm | -1 day |
| 2:00 am | 7:00 pm | -1 day |
| 3:00 am | 8:00 pm | -1 day |
| 4:00 am | 9:00 pm | -1 day |
| 5:00 am | 10:00 pm | -1 day |
| 6:00 am | 11:00 pm | -1 day |
| 7:00 am | 12:00 am | Same day |
| 8:00 am | 1:00 am | Same day |
| 9:00 am | 2:00 am | Same day |
| 10:00 am | 3:00 am | Same day |
| 11:00 am | 4:00 am | Same day |
| 12:00 pm | 5:00 am | Same day |
| 1:00 pm | 6:00 am | Same day |
| 2:00 pm | 7:00 am | Same day |
| 3:00 pm | 8:00 am | Same day |
| 4:00 pm | 9:00 am | Same day |
| 5:00 pm | 10:00 am | Same day |
| 6:00 pm | 11:00 am | Same day |
| 7:00 pm | 12:00 pm | Same day |
| 8:00 pm | 1:00 pm | Same day |
| 9:00 pm | 2:00 pm | Same day |
| 10:00 pm | 3:00 pm | Same day |
| 11:00 pm | 4:00 pm | Same day |
Daylight saving time
Ottawa observes daylight saving time; Riyadh does not. The offset between the two zones changes when Ottawa transitions: on Sunday, November 1, 2026, clocks fall back from EDT to EST.
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
- 5:16 AM
- Sunset
- 8:49 PM
- Day length
- 15h 33m
Cities in these zones
Other cities in Eastern 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 Eastern Time
- YTZ
- YYZ
- YHU
- YMX
- YUL
- YND
- YOW
- YRO
Related conversions
Common conversions
- What is 9:00 am Riyadh in Ottawa?
- 9:00 am Riyadh is 2:00 am Ottawa.
- What is 12:00 pm Riyadh in Ottawa?
- 12:00 pm Riyadh is 5:00 am Ottawa.
- What is 12:30 pm Riyadh in Ottawa?
- 12:30 pm Riyadh is 5:30 am Ottawa.
- What is 2:00 pm Riyadh in Ottawa?
- 2:00 pm Riyadh is 7:00 am Ottawa.
- What is 5:00 pm Riyadh in Ottawa?
- 5:00 pm Riyadh is 10:00 am Ottawa.
- What is 11:30 pm Riyadh in Ottawa?
- 11:30 pm Riyadh is 4:30 pm Ottawa.