Riyadh to KST
+6hRiyadh
ASTSOURCEKST
KSTGreen rows indicate typical business hours (9 AM - 5 PM)
AST and KST on the World Map
The map below highlights the AST (Arabia Standard Time) and KST (Korea 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).
KST – Korea Standard Time
UTC+09:00Korea Standard Time (KST) is the time zone for South Korea, 9 hours ahead of UTC.
- •South Korea does not observe daylight saving time.
- •Seoul is home to Samsung, LG, and Hyundai headquarters.
- •KST is the same offset as JST (UTC+09:00).
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.
Riyadh to KST Time Difference – Complete Guide
Riyadh runs on Arabian Standard Time (AST) at UTC+03:00. KST runs on Korea Standard Time (KST) at UTC+09:00. That puts Riyadh 6 hours ahead of KST — a difference of +6h at the current offsets.
In practice, when it is 9:00 AM in Riyadh it is 3:00 PM in KST. Midnight in Riyadh is 6:00 AM in KST. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Riyadh to KST time conversion table
| Riyadh (AST) | KST (KST) | Day |
|---|---|---|
| 12:00 AM | 6:00 AM | same day |
| 6:00 AM | 12:00 PM | same day |
| 7:00 AM | 1:00 PM | same day |
| 8:00 AM | 2:00 PM | same day |
| 9:00 AM | 3:00 PM | same day |
| 12:00 PM | 6:00 PM | same day |
| 3:00 PM | 9:00 PM | same day |
| 5:00 PM | 11:00 PM | same day |
| 6:00 PM | 12:00 AM | next day |
| 9:00 PM | 3:00 AM | next day |
Why people convert Riyadh to KST time
- Scheduling a call from Riyadh to KST: a 10:00 AM start in Riyadh lands at 4:00 PM in KST, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Riyadh and KST are inside the 9-to-5 working day between 9:00 AM and 11:00 AM AST time (3:00 PM–5:00 PM KST). That is roughly 2 hours of usable overlap.
- Keeping family and friends in sync: knowing that 8:00 PM in Riyadh is 2:00 AM in KST makes it easy to avoid calling at 3 AM.
- Always state the zone abbreviation, not just the hour. "3:00 PM AST" is unambiguous; "3 PM" across a +6h gap is not.
- Block 9:00 AM–11:00 AM AST as the recurring meeting window if you work primarily from Riyadh and need KST 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 KST (Korea Standard Time)
Korea Standard Time (KST) is the time zone used in South Korea. It shares the same UTC offset as Japan Standard Time but is a distinct time zone. South Korea does not observe daylight saving time. Seoul, the capital, is a major global tech and business hub.
Best time to call between Riyadh and KST
Both Riyadh and KST sit inside the 9 AM – 5 PM working day between 9:00 AM–11:00 AM AST, which is 3:00 PM–5:00 PM KST. That gives roughly 2 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
Riyadh and KST overlap for about 2 hours during the working day — enough for meetings if you avoid the edges of the window.
Riyadh is 6 hours ahead of KST (AST UTC+03:00 → KST UTC+09:00). The shared working window is 9:00 AM–11:00 AM AST. 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 Riyadh and KST?
Riyadh (AST, UTC+03:00) is 6 hours ahead of KST (KST, UTC+09:00). The gap is currently +6h.
How do I convert Riyadh time to KST time?
Add +6h to Riyadh local time. For example, 9:00 AM in Riyadh is 3:00 PM in KST.
What time is it in KST right now?
KST uses KST at UTC+09:00. Use the live converter at the top of this page — it updates in real time and already accounts for the +6h offset from Riyadh.
What is the best time to call KST from Riyadh?
Call between 9:00 AM and 11:00 AM AST — that maps to 3:00 PM–5:00 PM KST and keeps both parties inside the working day.
Which is ahead, Riyadh or KST?
Riyadh is 6 hours ahead of KST. When it is 12:00 PM in Riyadh it is 6:00 PM in KST.
Do Riyadh and KST use different time zones?
Riyadh (Saudi Arabia) uses AST at UTC+03:00, while KST uses KST at UTC+09:00. The IANA identifiers are Asia/Riyadh and Asia/Seoul.
Does daylight saving time affect the Riyadh–KST difference?
Neither zone observes daylight saving time, so the +6h offset between Riyadh and KST 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 KST?
Not normally. The +6h gap only pushes the date over for late-evening times.
What is the time difference between Riyadh and KST?
KST is +6h 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 KST in?
KST 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 KST timezone?
Major cities in the KST timezone include Seoul, Busan, Incheon, Daegu, Daejeon, Pyongyang.
What is the UTC offset for KST?
Korea Standard Time (KST) is at UTC+09:00.
What should I know about the KST timezone?
South Korea does not observe daylight saving time. Seoul is home to Samsung, LG, and Hyundai headquarters.
When is it midnight in Riyadh, what time is it in KST?
When it is 12:00 AM (midnight) in Riyadh (AST), it is +6h later in KST (KST).
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