Thailand to Riyadh
-4hThailand
ICTSOURCERiyadh
ASTGreen rows indicate typical business hours (9 AM - 5 PM)
ICT and AST on the World Map
The map below highlights the ICT (Indochina Time) and AST (Arabia Standard Time) timezone regions across the globe.
ICT – Indochina Time
UTC+07:00Indochina Time (ICT) is the time zone for Vietnam, Thailand, Laos, and Cambodia, 7 hours ahead of UTC.
- •Bangkok is one of the most visited cities in the world.
- •ICT is 12 hours ahead of EST.
- •Thailand, Vietnam, and Cambodia all share ICT.
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.
Understanding the -4h Gap: Thailand vs Riyadh
Thailand runs on Indochina Time (ICT) at UTC+07:00. Riyadh runs on Arabian Standard Time (AST) at UTC+03:00. That puts Thailand 4 hours behind Riyadh — a difference of -4h at the current offsets.
In practice, when it is 9:00 AM in Thailand it is 5:00 AM in Riyadh. Midnight in Thailand is 8:00 PM in Riyadh. Neither zone observes daylight saving time, so the offset between them stays constant all year.
Thailand to Riyadh time conversion table
| Thailand (ICT) | Riyadh (AST) | Day |
|---|---|---|
| 12:00 AM | 8:00 PM | previous day |
| 6:00 AM | 2:00 AM | same day |
| 7:00 AM | 3:00 AM | same day |
| 8:00 AM | 4:00 AM | same day |
| 9:00 AM | 5:00 AM | same day |
| 12:00 PM | 8:00 AM | same day |
| 3:00 PM | 11:00 AM | same day |
| 5:00 PM | 1:00 PM | same day |
| 6:00 PM | 2:00 PM | same day |
| 9:00 PM | 5:00 PM | same day |
Why people convert Thailand to Riyadh time
- Scheduling a call from Thailand to Riyadh: a 10:00 AM start in Thailand lands at 6:00 AM in Riyadh, so you can confirm the slot without doing the arithmetic yourself.
- Finding shared working hours: both Thailand and Riyadh are inside the 9-to-5 working day between 1:00 PM and 5:00 PM ICT time (9:00 AM–1:00 PM AST). That is roughly 4 hours of usable overlap.
- Watching a live event or market open: Thailand viewers need 5:00 AM in Riyadh to catch a 9:00 AM start there, and 4:00 AM if the event is anchored to Thailand.
- Always state the zone abbreviation, not just the hour. "3:00 PM ICT" is unambiguous; "3 PM" across a -4h gap is not.
- Block 1:00 PM–5:00 PM ICT as the recurring meeting window if you work primarily from Thailand and need Riyadh colleagues present.
About ICT (Indochina Time)
Indochina Time (ICT) is used across Southeast Asia including Vietnam, Thailand, Laos, and Cambodia. Indonesia (Western time, WIB) also uses UTC+07:00. ICT does not observe daylight saving time.
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 Thailand and Riyadh
Both Thailand and Riyadh sit inside the 9 AM – 5 PM working day between 1:00 PM–5:00 PM ICT, which is 9:00 AM–1:00 PM AST. That gives roughly 4 hours of shared time — the safest window for a live call or meeting.
Business hours overlap
Thailand and Riyadh overlap for about 4 hours during the working day — enough for meetings if you avoid the edges of the window.
Thailand is 4 hours behind Riyadh (ICT UTC+07:00 → AST UTC+03:00). The shared working window is 1:00 PM–5:00 PM ICT. 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 Thailand and Riyadh?
Thailand (ICT, UTC+07:00) is 4 hours behind Riyadh (AST, UTC+03:00). The gap is currently -4h.
How do I convert Thailand time to Riyadh time?
Add -4h to Thailand local time. For example, 9:00 AM in Thailand is 5:00 AM 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 -4h offset from Thailand.
What is the best time to call Riyadh from Thailand?
Call between 1:00 PM and 5:00 PM ICT — that maps to 9:00 AM–1:00 PM AST and keeps both parties inside the working day.
Which is behind, Thailand or Riyadh?
Thailand is 4 hours behind Riyadh. When it is 12:00 PM in Thailand it is 8:00 AM in Riyadh.
Do Thailand and Riyadh use different time zones?
Thailand (Thailand) uses ICT at UTC+07:00, while Riyadh (Saudi Arabia) uses AST at UTC+03:00. The IANA identifiers are Asia/Bangkok and Asia/Riyadh.
Does daylight saving time affect the Thailand–Riyadh difference?
Neither zone observes daylight saving time, so the -4h offset between Thailand and Riyadh is fixed all year.
Which other cities share Thailand's time zone?
ICT also covers Bangkok, Ho Chi Minh City, Hanoi, Jakarta, Phnom Penh, Vientiane.
Which countries use ICT, Thailand's zone?
ICT is used in Thailand, Vietnam, Cambodia, Laos, Indonesia (WIB).
Is there a day difference between Thailand and Riyadh?
Not normally. The -4h gap only pushes the date over the previous day.
What is the time difference between Thailand and Riyadh?
Riyadh is -4h from Thailand.
What timezone is Thailand in?
Thailand 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 ICT (Indochina Time)?
ICT is used in Thailand, Vietnam, Cambodia, Laos, Indonesia (WIB).
Does ICT observe daylight saving time?
No, ICT does not observe daylight saving time and remains at UTC+07:00 year-round.
What are some interesting facts about ICT?
Bangkok is one of the most visited cities in the world. ICT is 12 hours 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 Thailand, what time is it in Riyadh?
When it is 12:00 AM (midnight) in Thailand (ICT), it is -4h later in Riyadh (AST).
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