AST to MST Time Converter
Arabia Standard Time → Mountain Standard Time
AST = UTC+3MST = UTC-6
⚠️ AST is ambiguous — on this page it means Arabia Standard Time. It also refers to:
AST (Riyadh) ↔ MST (Denver)
No overlap — one side will join outside working hours
AST (Riyadh)
MST (Denver)
Working hours: 09:00–17:00 local. Green = both working. Purple = one side only.
Frequently Asked Questions
What is the difference between ast and mst?
Arabia Standard Time (ast) is UTC+3 and Mountain Standard Time (mst) is UTC-6. The difference between them is 9 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 mst used?
Mountain Standard Time (mst) is used in USA and surrounding regions. The IANA timezone identifier is America/Denver.
How do I convert ast to mst?
Use the interactive converter above. Drag the time slider to any ast time and the mst 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