AST to JST Time Converter
Arabia Standard Time → Japan Standard Time
AST = UTC+3JST = UTC+9
⚠️ AST is ambiguous — on this page it means Arabia Standard Time. It also refers to:
AST (Riyadh) ↔ JST (Tokyo)
2h of business hours overlap daily (09:00–17:00)
AST (Riyadh)
JST (Tokyo)
Working hours: 09:00–17:00 local. Green = both working. Purple = one side only.
Frequently Asked Questions
What is the difference between ast and jst?
Arabia Standard Time (ast) is UTC+3 and Japan Standard Time (jst) is UTC+9. The difference between them is 6 hours.
Where is ast used?
Arabia Standard Time (ast) is used in Saudi Arabia and surrounding regions. The IANA timezone identifier is Asia/Riyadh. Note: ast is ambiguous and may refer to other timezones.
Where is jst used?
Japan Standard Time (jst) is used in Japan and surrounding regions. The IANA timezone identifier is Asia/Tokyo.
How do I convert ast to jst?
Use the interactive converter above. Drag the time slider to any ast time and the jst equivalent updates instantly. You can also type a time like "3pm" or "15:00" in the input bar.
Popular AST conversions
AST → LondonAST → New YorkAST → TokyoAST → DubaiAST → SydneyAST → ParisAST → BerlinAST → SingaporeAST → Los AngelesAST → Toronto