Sydney
Chicago
Convert AEST to CST
Australian Eastern Standard Time to Central Standard Time — Chicago is 15 hours behind Sydney
Quick Facts
Time Difference
-15 hours
AEST Full Name
Australian Eastern Standard Time
CST Full Name
Central Standard Time
AEST to CST Conversion Table
Related Conversions
About AEST and CST Time Zones
AEST (Australian Eastern Standard Time) is UTC+10 and covers cities like Sydney, Melbourne, Brisbane. CST (Central Standard Time) is UTC-6 and covers cities like Chicago, Dallas, Houston.
When it's 12:00 PM (noon) in Sydney (AEST), it's 9:00 PM in Chicago (CST). The time difference between AEST and CST is 15 hours — Chicago is behind Sydney.
With a 16-hour gap, scheduling overlap is very limited. Early morning in Sydney (6–8 AM) corresponds to evening or late night in Chicago.
Daylight Saving Time
AEST observes Daylight Saving Time and becomes AEDT (Australian Eastern Daylight Time) during summer months, shifting clocks forward by 1 hour to UTC+11.
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 AEST 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 Sydney and Chicago with a visual timeline, or browse more timezone conversions.
Frequently Asked Questions
What is the time difference between AEST and CST?
Chicago (CST) is 15 hours behind Sydney (AEST). The offset is -15 hours.
Is CST ahead or behind AEST?
CST is 15 hours behind AEST. AEST is UTC+10 and CST is UTC-5.
When it's 12:00 PM in Sydney, what time is it in Chicago?
When it's 12:00 PM (noon) in Sydney (AEST), it's 9:00 PM in Chicago (CST).
When it's 5:00 PM in Sydney, what time is it in Chicago?
When it's 5:00 PM in Sydney (AEST), it's 2:00 AM in Chicago (CST).
Does AEST change for Daylight Saving Time?
Yes. AEST (Australian Eastern Standard Time, UTC+10) becomes AEDT (Australian Eastern Daylight Time, UTC+11) in summer, shifting clocks forward 1 hour.
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.