Riyadh to AST
-7hRiyadh
ASTSOURCEAST
ASTGreen rows indicate typical business hours (9 AM - 5 PM)
AST and AST on the World Map
The map below highlights the AST (Arabia Standard Time) and AST (Atlantic Standard Time) timezone regions across the globe.
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).
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.
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.
Everything You Need to Know About Riyadh and AST Time
Riyadh runs on Arabian Standard Time (AST) at UTC+03:00. AST runs on Atlantic Standard Time (AST) at UTC-04:00. That puts Riyadh 7 hours behind AST — a difference of -7h at the current offsets.
In practice, when it is 9:00 AM in Riyadh it is 2:00 AM in AST. Midnight in Riyadh is 5:00 PM in AST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Riyadh to AST time conversion table
| Riyadh (AST) | AST (AST) | Day |
|---|---|---|
| 12:00 AM | 5:00 PM | previous day |
| 6:00 AM | 11:00 PM | previous 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 |
| 12:00 PM | 5:00 AM | same day |
| 3:00 PM | 8:00 AM | same day |
| 5:00 PM | 10:00 AM | same day |
| 6:00 PM | 11:00 AM | same day |
| 9:00 PM | 2:00 PM | same day |
Why people convert Riyadh to AST time
- Scheduling a call from Riyadh to AST: a 10:00 AM start in Riyadh lands at 3:00 AM in AST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Riyadh and AST are inside the 9-to-5 working day between 4:00 PM and 5:00 PM AST time (9:00 AM–10:00 AM AST). That is roughly 1 hours of usable overlap.
- Booking travel or deliveries: tracking AST local time against Riyadh keeps pickup windows and arrival estimates honest across the -7h offset.
- Always state the zone abbreviation, not just the hour. "3:00 PM AST" is unambiguous; "3 PM" across a -7h gap is not.
- Block 4:00 PM–5:00 PM AST as the recurring meeting window if you work primarily from Riyadh and need AST colleagues present.
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.
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.
Best time to call between Riyadh and AST
Both Riyadh and AST sit inside the 9 AM – 5 PM working day between 4:00 PM–5:00 PM AST, which is 9:00 AM–10:00 AM AST. That gives roughly 1 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
Riyadh and AST overlap for only 60 minutes (4:00 PM–5:00 PM AST), so meetings have to be booked precisely.
Riyadh is 7 hours behind AST (AST UTC+03:00 → AST UTC-04:00). The shared working window is 4:00 PM–5:00 PM AST. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
Riyadh
Does not observe DST
AST
☀ Currently in DST
Standard: UTC-04:00 · DST: UTC-03:00
Clocks fall back on Sun, Nov 1, 2026
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 Riyadh and AST?
Riyadh (AST, UTC+03:00) is 7 hours behind AST (AST, UTC-04:00). The gap is currently -7h.
How do I convert Riyadh time to AST time?
Add -7h to Riyadh local time. For example, 9:00 AM in Riyadh is 2:00 AM in AST.
What time is it in AST right now?
AST uses AST at UTC-04:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -7h offset from Riyadh.
What is the best time to call AST from Riyadh?
Call between 4:00 PM and 5:00 PM AST — that maps to 9:00 AM–10:00 AM AST and keeps both parties inside the working day.
Which is behind, Riyadh or AST?
Riyadh is 7 hours behind AST. When it is 12:00 PM in Riyadh it is 5:00 AM in AST.
Do Riyadh and AST use different time zones?
Riyadh (Saudi Arabia) uses AST at UTC+03:00, while AST uses AST at UTC-04:00. The IANA identifiers are Asia/Riyadh and America/Halifax.
Does daylight saving time affect the Riyadh–AST difference?
Neither zone observes daylight saving time, so the -7h offset between Riyadh and AST is fixed all year.
Which other cities share Riyadh's time zone?
AST also covers Riyadh, Jeddah, Doha, Kuwait City, Baghdad.
Which countries use AST, Riyadh's zone?
AST is used in Saudi Arabia, Qatar, Kuwait, Bahrain, Iraq, Yemen.
Is there a day difference between Riyadh and AST?
Not normally. The -7h gap only pushes the date over the previous day.
What is the time difference between Riyadh and AST?
AST is -7h from Riyadh.
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 timezone is AST in?
AST operates on its local timezone.
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 (Arabia Standard Time)?
AST is used in Saudi Arabia, Qatar, Kuwait, Bahrain, Iraq, Yemen.
Does AST observe daylight saving time?
No, AST does not observe daylight saving time and remains at UTC+03:00 year-round.
What are some interesting facts about AST?
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.
Which cities are in the AST timezone?
Major cities in the AST timezone include Halifax, San Juan, Santo Domingo, Caracas, La Paz, Fredericton, Charlottetown.
What is the UTC offset for AST?
Atlantic Standard Time (AST) is at UTC-04:00. During daylight saving time, it shifts to ADT.
What should I know about the AST timezone?
Puerto Rico uses AST year-round and does not observe DST. AST is 1 hour ahead of EST.
When is it midnight in Riyadh, what time is it in AST?
When it is 12:00 AM (midnight) in Riyadh (AST), it is -7h later in AST (AST).
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