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