COT to Riyadh
+8hCOT
COTSOURCERiyadh
ASTGreen rows indicate typical business hours (9 AM - 5 PM)
COT and AST on the World Map
The map below highlights the COT (Colombia Time) and AST (Arabia Standard Time) timezone regions across the globe.
COT – Colombia Time
UTC-05:00Colombia Time (COT) is the standard time for Colombia, 5 hours behind UTC.
- •Colombia does not observe daylight saving time.
- •COT is the same offset as EST (UTC-05:00).
- •Bogotá sits at 2,640m elevation, making it one of the highest capital cities.
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.
COT to Riyadh Time Difference – Complete Guide
COT runs on Colombia Time (COT) at UTC-05:00. Riyadh runs on Arabian Standard Time (AST) at UTC+03:00. That puts COT 8 hours ahead of Riyadh — a difference of +8h at the current offsets.
In practice, when it is 9:00 AM in COT it is 5:00 PM in Riyadh. Midnight in COT is 8:00 AM in Riyadh. Neither zone observes daylight saving time, so the offset between them stays constant all year.
COT to Riyadh time conversion table
| COT (COT) | Riyadh (AST) | Day |
|---|---|---|
| 12:00 AM | 8:00 AM | same day |
| 6:00 AM | 2:00 PM | same day |
| 7:00 AM | 3:00 PM | same day |
| 8:00 AM | 4:00 PM | same day |
| 9:00 AM | 5:00 PM | same day |
| 12:00 PM | 8:00 PM | same day |
| 3:00 PM | 11:00 PM | same day |
| 5:00 PM | 1:00 AM | next day |
| 6:00 PM | 2:00 AM | next day |
| 9:00 PM | 5:00 AM | next day |
Why people convert COT to Riyadh time
- Scheduling a call from COT to Riyadh: a 10:00 AM start in COT lands at 6:00 PM in Riyadh, so you can confirm the slot without doing the arithmetic yourself.
- Handling a +8h gap: COT and Riyadh have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in Riyadh is 5:00 PM in COT.
- Watching a live event or market open: COT viewers need 5:00 PM in Riyadh to catch a 9:00 AM start there, and 4:00 PM if the event is anchored to COT.
- Always state the zone abbreviation, not just the hour. "3:00 PM COT" is unambiguous; "3 PM" across a +8h gap is not.
- With a +8h gap there is no shared 9-to-5 window, so alternate the early start: one week COT takes the early slot, the next week Riyadh does.
About COT (Colombia Time)
Colombia Time (COT) is used throughout Colombia. Colombia does not observe daylight saving time. COT shares the same offset as EST (UTC-05:00). Bogotá, the capital, is one of the largest cities in South America.
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 COT and Riyadh
With a +8h offset there is no overlap inside a normal 9 AM – 5 PM day. Riyadh opens at 9:00 AM AST, which is 5:00 PM in COT, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
COT and Riyadh have no shared working hours because of the +8h gap. Teams need to alternate early starts or rely on asynchronous handovers.
COT is 8 hours ahead of Riyadh (COT UTC-05:00 → AST UTC+03:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
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 COT and Riyadh?
COT (COT, UTC-05:00) is 8 hours ahead of Riyadh (AST, UTC+03:00). The gap is currently +8h.
How do I convert COT time to Riyadh time?
Add +8h to COT local time. For example, 9:00 AM in COT is 5:00 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 +8h offset from COT.
What is the best time to call Riyadh from COT?
There is no shared working-hours window because of the +8h gap. The closest option is 1:00 PM in COT, which is 9:00 PM in Riyadh.
Which is ahead, COT or Riyadh?
COT is 8 hours ahead of Riyadh. When it is 12:00 PM in COT it is 8:00 PM in Riyadh.
Do COT and Riyadh use different time zones?
COT uses COT at UTC-05:00, while Riyadh (Saudi Arabia) uses AST at UTC+03:00. The IANA identifiers are America/Bogota and Asia/Riyadh.
Does daylight saving time affect the COT–Riyadh difference?
Neither zone observes daylight saving time, so the +8h offset between COT and Riyadh is fixed all year.
Which other cities share COT's time zone?
COT also covers Bogotá, Medellín, Cali, Barranquilla, Cartagena.
Which countries use COT, COT's zone?
COT is used in Colombia.
Is there a day difference between COT and Riyadh?
Not normally. The +8h gap only pushes the date over for late-evening times.
What is the time difference between COT and Riyadh?
Riyadh is +8h from COT.
What timezone is COT in?
COT 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 COT (Colombia Time)?
COT is used in Colombia.
Does COT observe daylight saving time?
No, COT does not observe daylight saving time and remains at UTC-05:00 year-round.
What are some interesting facts about COT?
Colombia does not observe daylight saving time. COT is the same offset as EST (UTC-05:00).
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 COT, what time is it in Riyadh?
When it is 12:00 AM (midnight) in COT (COT), it is +8h later in Riyadh (AST).
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