Chicago
Sydney
Convert CST to AEST
Central Standard Time to Australian Eastern Standard Time — Sydney is 15 hours ahead of Chicago
Quick Facts
Time Difference
+15 hours
CST Full Name
Central Standard Time
AEST Full Name
Australian Eastern Standard Time
CST to AEST Conversion Table
Related Conversions
About CST and AEST Time Zones
CST (Central Standard Time) is UTC-6 and covers cities like Chicago, Dallas, Houston. AEST (Australian Eastern Standard Time) is UTC+10 and covers cities like Sydney, Melbourne, Brisbane.
When it's 12:00 PM (noon) in Chicago (CST), it's 3:00 AM in Sydney (AEST). The time difference between CST and AEST is 15 hours — Sydney is ahead of Chicago.
With a 16-hour gap, scheduling overlap is very limited. Early morning in Chicago (6–8 AM) corresponds to evening or late night in Sydney.
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.
AEST observes Daylight Saving Time and becomes AEDT (Australian Eastern Daylight Time) during summer months, shifting clocks forward by 1 hour to UTC+11.
During DST transitions, the time difference between CST and AEST may shift by ±1 hour. Always verify the current offset above for the most accurate conversion.
Use our world clock tool to compare Chicago and Sydney with a visual timeline, or browse more timezone conversions.
Frequently Asked Questions
What is the time difference between CST and AEST?
Sydney (AEST) is 15 hours ahead of Chicago (CST). The offset is +15 hours.
Is AEST ahead or behind CST?
AEST is 15 hours ahead of CST. CST is UTC-5 and AEST is UTC+10.
When it's 12:00 PM in Chicago, what time is it in Sydney?
When it's 12:00 PM (noon) in Chicago (CST), it's 3:00 AM in Sydney (AEST).
When it's 5:00 PM in Chicago, what time is it in Sydney?
When it's 5:00 PM in Chicago (CST), it's 8:00 AM in Sydney (AEST).
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.
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.