What is CST in AEST?
Australian Eastern Time is 15 hours ahead
Central Time is on UTC−5:00 and Australian Eastern Time is on UTC+10:00 right now. Central Time is on daylight saving, so its clocks read CDT. The gap changes during the year — see below.
- Time in Chicago
- 9:14 pm
- Time in Sydney
- 12:14 pm
- Difference
- +15 h
- Next clock change
- October 3, 2026
Convert a time
AEST — Australian Eastern Time
12:00 pm
Wed, the next day
When the difference changes
Central Time and Australian Eastern Time do not change their clocks on the same dates, so the gap between them is not the same all year. Most converters show only today’s figure. These are the periods ahead:
- Now – October 3, 2026Australian Eastern Time is 15 hours ahead
- October 3, 2026 – November 1, 2026Australian Eastern Time is 16 hours ahead
- November 1, 2026 – March 14, 2027Australian Eastern Time is 17 hours ahead
- March 14, 2027 – April 3, 2027Australian Eastern Time is 16 hours ahead
- April 3, 2027 – October 2, 2027Australian Eastern Time is 15 hours ahead
- October 2, 2027 – onwardsAustralian Eastern Time is 16 hours ahead
Periods shorter than a day are not listed: both zones change at 2am in their own local time, so there are a few hours on each transition date when the gap is briefly something else.
Daylight saving
Central Time
Clocks go back one hour at 2am local time, becoming CST.
Australian Eastern Time
Clocks go forward one hour at 2am local time, becoming AEDT.
CST to AEST conversion table
Every hour of Tuesday, September 22, 2026, converted from Central Time to Australian Eastern Time. 15 of the 24 hours fall on a different calendar day in Sydney, which is marked.
- 12:00 am CDT
- 3:00 pm AEST
- 1:00 am CDT
- 4:00 pm AEST
- 2:00 am CDT
- 5:00 pm AEST
- 3:00 am CDT
- 6:00 pm AEST
- 4:00 am CDT
- 7:00 pm AEST
- 5:00 am CDT
- 8:00 pm AEST
- 6:00 am CDT
- 9:00 pm AEST
- 7:00 am CDT
- 10:00 pm AEST
- 8:00 am CDT
- 11:00 pm AEST
- 9:00 am CDT
- 12:00 am AEST+1 day
- 10:00 am CDT
- 1:00 am AEST+1 day
- 11:00 am CDT
- 2:00 am AEST+1 day
- 12:00 pm CDT
- 3:00 am AEST+1 day
- 1:00 pm CDT
- 4:00 am AEST+1 day
- 2:00 pm CDT
- 5:00 am AEST+1 day
- 3:00 pm CDT
- 6:00 am AEST+1 day
- 4:00 pm CDT
- 7:00 am AEST+1 day
- 5:00 pm CDT
- 8:00 am AEST+1 day
- 6:00 pm CDT
- 9:00 am AEST+1 day
- 7:00 pm CDT
- 10:00 am AEST+1 day
- 8:00 pm CDT
- 11:00 am AEST+1 day
- 9:00 pm CDT
- 12:00 pm AEST+1 day
- 10:00 pm CDT
- 1:00 pm AEST+1 day
- 11:00 pm CDT
- 2:00 pm AEST+1 day
Scheduling between the two
There is no overlap between a nine-to-six working day in Chicago and one in Sydney — the gap is too wide. A call has to sit early or late for one side. Early morning in Chicago is the usual compromise, since that is late afternoon or evening in Sydney.
A note on CST: it can also mean China Standard Time (UTC+8) and Cuba Standard Time (UTC−5). This page means US Central Time.
Central Time (CDT) is used in Dallas, Houston, Mexico City and Winnipeg
Australian Eastern Time (AEST) is used in Melbourne, Canberra and Brisbane. Queensland stays on AEST all year while the southern states move to AEDT.