Tokyo
Riyadh
Convert JST to AST
Japan Standard Time to Arabia Standard Time — Riyadh is 6 hours behind Tokyo
Quick Facts
Time Difference
-6 hours
JST Full Name
Japan Standard Time
AST Full Name
Arabia Standard Time
JST to AST Conversion Table
Related Conversions
About JST and AST Time Zones
JST (Japan Standard Time) is UTC+9 and covers cities like Tokyo, Osaka, Kyoto. AST (Arabia Standard Time) is UTC+3 and covers cities like Riyadh, Jeddah, Baghdad.
When it's 12:00 PM (noon) in Tokyo (JST), it's 6:00 AM in Riyadh (AST). The time difference between JST and AST is 6 hours — Riyadh is behind Tokyo.
The best meeting window is 9:00 AM–11:00 AM JST (3:00 PM–5:00 PM AST).
Use our world clock tool to compare Tokyo and Riyadh with a visual timeline, or browse more timezone conversions.
Frequently Asked Questions
What is the time difference between JST and AST?
Riyadh (AST) is 6 hours behind Tokyo (JST). The offset is -6 hours.
Is AST ahead or behind JST?
AST is 6 hours behind JST. JST is UTC+9 and AST is UTC+3.
When it's 12:00 PM in Tokyo, what time is it in Riyadh?
When it's 12:00 PM (noon) in Tokyo (JST), it's 6:00 AM in Riyadh (AST).
When it's 5:00 PM in Tokyo, what time is it in Riyadh?
When it's 5:00 PM in Tokyo (JST), it's 11:00 AM in Riyadh (AST).