AST to Riyadh
+7hAST
ASTSOURCERiyadh
ASTGreen rows indicate typical business hours (9 AM - 5 PM)
AST and AST on the World Map
The map below highlights the AST (Atlantic Standard Time) and AST (Arabia Standard Time) timezone regions across the globe.
AST – Atlantic Standard Time
UTC-04:00Atlantic Standard Time (AST) is the time zone for the Canadian Atlantic provinces and the Caribbean, 4 hours behind UTC.
- •Puerto Rico uses AST year-round and does not observe DST.
- •AST is 1 hour ahead of EST.
- •Halifax, the capital of Nova Scotia, is the largest city in AST Canada.
AST – Arabia Standard Time
UTC+03:00Arabia Standard Time (AST, UTC+03:00) is the time zone for Saudi Arabia and the other Gulf states of the Arabian peninsula.
- •None of the Gulf states on Arabia Standard Time observe daylight saving.
- •AST is the same offset as Moscow Standard Time and East Africa Time.
- •Riyadh is one hour ahead of Central European Time in winter.
- •The AST abbreviation is shared with Atlantic Standard Time (UTC-04:00).
About Riyadh
WikipediaRiyadh operates on Arabia Standard Time (AST), UTC+3. As OPEC's de facto capital and home to Tadawul, Riyadh time impacts global energy markets.
Riyadh is growing rapidly as part of Saudi Vision 2030 modernization.
AST to Riyadh Time Difference – Complete Guide
AST runs on Atlantic Standard Time (AST) at UTC-04:00. Riyadh runs on Arabian Standard Time (AST) at UTC+03:00. That puts AST 7 hours ahead of Riyadh — a difference of +7h at the current offsets.
In practice, when it is 9:00 AM in AST it is 4:00 PM in Riyadh. Midnight in AST is 7:00 AM in Riyadh. Neither zone observes daylight saving time, so the offset between them stays constant all year.
AST to Riyadh time conversion table
| AST (AST) | Riyadh (AST) | Day |
|---|---|---|
| 12:00 AM | 7:00 AM | 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 |
| 12:00 PM | 7:00 PM | same day |
| 3:00 PM | 10:00 PM | same day |
| 5:00 PM | 12:00 AM | next day |
| 6:00 PM | 1:00 AM | next day |
| 9:00 PM | 4:00 AM | next day |
Why people convert AST to Riyadh time
- Scheduling a call from AST to Riyadh: a 10:00 AM start in AST lands at 5:00 PM in Riyadh, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both AST and Riyadh are inside the 9-to-5 working day between 9:00 AM and 10:00 AM AST time (4:00 PM–5:00 PM AST). That is roughly 1 hours of usable overlap.
- Watching a live event or market open: AST viewers need 4:00 PM in Riyadh to catch a 9:00 AM start there, and 5:00 PM if the event is anchored to AST.
- Always state the zone abbreviation, not just the hour. "3:00 PM AST" is unambiguous; "3 PM" across a +7h gap is not.
- Block 9:00 AM–10:00 AM AST as the recurring meeting window if you work primarily from AST and need Riyadh colleagues present.
About AST (Atlantic Standard Time)
Atlantic Standard Time (AST) covers Canada's Atlantic provinces (Nova Scotia, New Brunswick, Prince Edward Island, and most of Labrador), as well as several Caribbean nations. Puerto Rico and the US Virgin Islands use AST year-round without daylight saving time. The Canadian provinces switch to Atlantic Daylight Time (ADT) in summer.
About AST (Arabia Standard Time)
Arabia Standard Time (AST) is fixed at UTC+03:00 all year across Saudi Arabia, Qatar, Kuwait, Bahrain, Iraq and Yemen. None of these countries observes daylight saving time, so the offset never changes. The abbreviation collides with Atlantic Standard Time (UTC-04:00) used in eastern Canada and the Caribbean; this page covers the Arabian peninsula meaning. Arabia Standard Time is the same offset as Moscow Standard Time and East Africa Time, which makes scheduling with Europe straightforward — Riyadh is one hour ahead of Central European Time in winter and level with it during European summer time.
Best time to call between AST and Riyadh
Both AST and Riyadh sit inside the 9 AM – 5 PM working day between 9:00 AM–10:00 AM AST, which is 4:00 PM–5:00 PM AST. That gives roughly 1 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
AST and Riyadh overlap for only 60 minutes (9:00 AM–10:00 AM AST), so meetings have to be booked precisely.
AST is 7 hours ahead of Riyadh (AST UTC-04:00 → AST UTC+03:00). The shared working window is 9:00 AM–10:00 AM AST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
AST
☀ Currently in DST
Standard: UTC-04:00 · DST: UTC-03:00
Clocks fall back on Sun, Nov 1, 2026
Riyadh
Does not observe DST
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between AST and Riyadh?
AST (AST, UTC-04:00) is 7 hours ahead of Riyadh (AST, UTC+03:00). The gap is currently +7h.
How do I convert AST time to Riyadh time?
Add +7h to AST local time. For example, 9:00 AM in AST is 4:00 PM in Riyadh.
What time is it in Riyadh right now?
Riyadh uses AST at UTC+03:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +7h offset from AST.
What is the best time to call Riyadh from AST?
Call between 9:00 AM and 10:00 AM AST — that maps to 4:00 PM–5:00 PM AST and keeps both parties inside the working day.
Which is ahead, AST or Riyadh?
AST is 7 hours ahead of Riyadh. When it is 12:00 PM in AST it is 7:00 PM in Riyadh.
Do AST and Riyadh use different time zones?
AST uses AST at UTC-04:00, while Riyadh (Saudi Arabia) uses AST at UTC+03:00. The IANA identifiers are America/Halifax and Asia/Riyadh.
Does daylight saving time affect the AST–Riyadh difference?
Neither zone observes daylight saving time, so the +7h offset between AST and Riyadh is fixed all year.
Which other cities share AST's time zone?
AST also covers Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.
Which countries use AST, AST's zone?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, Barbados, Trinidad and Tobago.
Is there a day difference between AST and Riyadh?
Not normally. The +7h gap only pushes the date over for late-evening times.
What is the time difference between AST and Riyadh?
Riyadh is +7h from AST.
What timezone is AST in?
AST operates on its local timezone.
What timezone is Riyadh in?
Riyadh operates on Arabia Standard Time (AST), UTC+3. As OPEC's de facto capital and home to Tadawul, Riyadh time impacts global energy markets.
What are the business hours in Riyadh?
Standard business hours in Riyadh are 8:00 AM - 4:00 PM AST (Sunday-Thursday).
Which countries use AST (Atlantic Standard Time)?
AST is used in Canada (Atlantic provinces), Puerto Rico, US Virgin Islands, Dominican Republic, Venezuela, Bolivia, and 2 more countries.
Does AST observe daylight saving time?
Yes, AST switches to ADT during summer months.
What are some interesting facts about AST?
Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.
Which cities are in the AST timezone?
Major cities in the AST timezone include Riyadh, Jeddah, Doha, Kuwait City, Baghdad.
What is the UTC offset for AST?
Arabia Standard Time (AST) is at UTC+03:00.
What should I know about the AST timezone?
None of the Gulf states on Arabia Standard Time observe daylight saving. AST is the same offset as Moscow Standard Time and East Africa Time.
When is it midnight in AST, what time is it in Riyadh?
When it is 12:00 AM (midnight) in AST (AST), it is +7h later in Riyadh (AST).
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