Riyadh
Chicago
Convert AST to CST
Arabia Standard Time to Central Standard Time — Chicago is 8 hours behind Riyadh
Quick Facts
Time Difference
-8 hours
AST Full Name
Arabia Standard Time
CST Full Name
Central Standard Time
AST to CST Conversion Table
Related Conversions
About AST and CST Time Zones
AST (Arabia Standard Time) is UTC+3 and covers cities like Riyadh, Jeddah, Baghdad. CST (Central Standard Time) is UTC-6 and covers cities like Chicago, Dallas, Houston.
When it's 12:00 PM (noon) in Riyadh (AST), it's 4:00 AM in Chicago (CST). The time difference between AST and CST is 8 hours — Chicago is behind Riyadh.
The 9-hour difference makes real-time overlap challenging — early morning calls (7–9 AM AST) work best.
Daylight Saving Time
CST observes Daylight Saving Time and becomes CDT (Central Daylight Time) during summer months, shifting clocks forward by 1 hour to UTC-5.
During DST transitions, the time difference between AST and CST may shift by ±1 hour. Always verify the current offset above for the most accurate conversion.
Use our world clock tool to compare Riyadh and Chicago with a visual timeline, or browse more timezone conversions.
Frequently Asked Questions
What is the time difference between AST and CST?
Chicago (CST) is 8 hours behind Riyadh (AST). The offset is -8 hours.
Is CST ahead or behind AST?
CST is 8 hours behind AST. AST is UTC+3 and CST is UTC-5.
When it's 12:00 PM in Riyadh, what time is it in Chicago?
When it's 12:00 PM (noon) in Riyadh (AST), it's 4:00 AM in Chicago (CST).
When it's 5:00 PM in Riyadh, what time is it in Chicago?
When it's 5:00 PM in Riyadh (AST), it's 9:00 AM in Chicago (CST).
Does CST change for Daylight Saving Time?
Yes. CST (Central Standard Time, UTC-6) becomes CDT (Central Daylight Time, UTC-5) in summer, shifting clocks forward 1 hour.