AEST to Chicago
-15hAEST
AESTSOURCEChicago
CDTGreen rows indicate typical business hours (9 AM - 5 PM)
AEST and CDT on the World Map
The map below highlights the AEST (Australian Eastern Standard Time) and CDT (Central Standard Time) timezone regions across the globe.
AEST – Australian Eastern Standard Time
UTC+10:00Australian Eastern Standard Time (AEST) covers eastern Australia, 10 hours ahead of UTC.
- •Queensland does not observe daylight saving time, staying on AEST year-round.
- •Sydney and Melbourne switch to AEDT (UTC+11:00) in summer.
- •The Australian Securities Exchange (ASX) operates on AEST/AEDT.
- •AEST is 15 hours ahead of EST during winter.
CST – Central Standard Time
UTC-06:00Central Standard Time (CST) is the time zone for the central United States, Canada, and Mexico, 6 hours behind UTC.
- •CST covers 20 US states fully or partially.
- •Chicago and Houston are the two largest cities in the Central Time Zone.
- •Mexico City, one of the world's most populous cities, operates on CST.
- •CST is 1 hour behind EST and 2 hours ahead of PST.
About Chicago
WikipediaChicago operates on Central Time (CST/CDT), 1 hour behind New York. Home to CME and CBOE, Chicago is a global center for derivatives trading.
The Chicago Board of Trade is the world's oldest futures and options exchange.
Comparing Time Zones: AEST and Chicago
AEST runs on Australian Eastern Standard Time (AEST) at UTC+10:00. Chicago runs on Central Daylight Time (CDT) at UTC-05:00, also currently on daylight saving time. That puts AEST 15 hours behind Chicago — a difference of -15h at the current offsets.
In practice, when it is 9:00 AM in AEST it is 6:00 PM in Chicago on the previous day. Midnight in AEST is 9:00 AM in Chicago.Chicago observes daylight saving time while AEST does not, so the gap narrows or widens by an hour part of the year.
AEST to Chicago time conversion table
| AEST (AEST) | Chicago (CDT) | Day |
|---|---|---|
| 12:00 AM | 9:00 AM | previous day |
| 6:00 AM | 3:00 PM | previous day |
| 7:00 AM | 4:00 PM | previous day |
| 8:00 AM | 5:00 PM | previous day |
| 9:00 AM | 6:00 PM | previous day |
| 12:00 PM | 9:00 PM | previous day |
| 3:00 PM | 12:00 AM | same day |
| 5:00 PM | 2:00 AM | same day |
| 6:00 PM | 3:00 AM | same day |
| 9:00 PM | 6:00 AM | same day |
Why people convert AEST to Chicago time
- Scheduling a call from AEST to Chicago: a 10:00 AM start in AEST lands at 7:00 PM in Chicago the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -15h gap: AEST and Chicago have no overlap inside a normal 9-to-5 day, so real-time meetings need an early-morning or late-evening slot on one side. 9:00 AM in Chicago is 6:00 PM in AEST.
- Watching a live event or market open: AEST viewers need 6:00 PM in Chicago to catch a 9:00 AM start there, and 3:00 PM if the event is anchored to AEST.
- Always state the zone abbreviation, not just the hour. "3:00 PM AEST" is unambiguous; "3 PM" across a -15h gap is not.
- With a -15h gap there is no shared 9-to-5 window, so alternate the early start: one week AEST takes the early slot, the next week Chicago does.
- Chicago: Clocks fall back on Sun, Nov 1, 2026. Any meeting series spanning that date will shift by an hour in local time.
About AEST (Australian Eastern Standard Time)
Australian Eastern Standard Time (AEST) is used in the eastern states of Australia including New South Wales, Victoria, Queensland, Tasmania, and the ACT. During summer (October to April), NSW, VIC, TAS, and ACT switch to Australian Eastern Daylight Time (AEDT, UTC+11:00), while Queensland remains on AEST year-round.
About CST (Central Standard Time)
Central Standard Time (CST) covers the central region of North America. It is the second most populous time zone in the US, including major cities like Chicago, Houston, and Dallas. CST is also used in Mexico City and much of Central America including Guatemala, Honduras, El Salvador, and Costa Rica. During summer, most of the US and Canada switch to Central Daylight Time (CDT, UTC-05:00), while Mexico and Central American countries generally remain on CST.
Best time to call between AEST and Chicago
With a -15h offset there is no overlap inside a normal 9 AM – 5 PM day. Chicago opens at 9:00 AM CDT, which is 6:00 PM in AEST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
AEST and Chicago have no shared working hours because of the -15h gap. Teams need to alternate early starts or rely on asynchronous handovers.
AEST is 15 hours behind Chicago (AEST UTC+10:00 → CDT UTC-05:00). There is no shared 9-to-5 window, so plan around an early or late slot. Remember to re-check around daylight-saving transitions.
🕐 Daylight Saving Time Info
AEST
❄ Currently in Standard Time
Standard: UTC+10:00 · DST: UTC+11:00
Clocks spring forward on Sat, Oct 3, 2026
Chicago
☀ Currently in DST
Standard: UTC-06:00 · DST: UTC-05:00
Clocks fall back on Sun, Nov 1, 2026
⚠ These locations are currently in different DST states, so the time difference may change when clocks adjust.
Learn More About Time
Dive deeper into the fascinating world of timekeeping, time zones, and how they shape our global society:
Frequently Asked Questions
What is the time difference between AEST and Chicago?
AEST (AEST, UTC+10:00) is 15 hours behind Chicago (CDT, UTC-05:00). The gap is currently -15h.
How do I convert AEST time to Chicago time?
Add -15h to AEST local time. For example, 9:00 AM in AEST is 6:00 PM in Chicago (previous day).
What time is it in Chicago right now?
Chicago uses CDT at UTC-05:00. Use the live converter at the top of this page — it updates in real time and already accounts for the -15h offset from AEST.
What is the best time to call Chicago from AEST?
There is no shared working-hours window because of the -15h gap. The closest option is 1:00 PM in AEST, which is 10:00 PM in Chicago.
Which is behind, AEST or Chicago?
AEST is 15 hours behind Chicago. When it is 12:00 PM in AEST it is 9:00 PM in Chicago.
Do AEST and Chicago use different time zones?
AEST uses AEST at UTC+10:00, while Chicago (USA) uses CDT at UTC-05:00. The IANA identifiers are Australia/Sydney and America/Chicago.
Does daylight saving time affect the AEST–Chicago difference?
Yes at the moment: Chicago is on daylight saving time and AEST is not, so the -15h gap shifts by an hour when exactly one of them changes clocks.
Which other cities share AEST's time zone?
AEST also covers Sydney, Melbourne, Brisbane, Canberra, Hobart, Gold Coast.
Which countries use AEST, AEST's zone?
AEST is used in Australia (NSW, VIC, QLD, TAS, ACT), Papua New Guinea.
Is there a day difference between AEST and Chicago?
Sometimes. The -15h gap is large enough that 8:00 PM or later in AEST already falls on the in Chicago.
What is the time difference between AEST and Chicago?
Chicago is -15h from AEST.
What timezone is AEST in?
AEST operates on its local timezone.
What timezone is Chicago in?
Chicago operates on Central Time (CST/CDT), 1 hour behind New York. Home to CME and CBOE, Chicago is a global center for derivatives trading.
What are the business hours in Chicago?
Standard business hours in Chicago are 8:00 AM - 5:00 PM CST.
Which countries use AEST (Australian Eastern Standard Time)?
AEST is used in Australia (NSW, VIC, QLD, TAS, ACT), Papua New Guinea.
Does AEST observe daylight saving time?
Yes, AEST switches to AEDT during summer months.
What are some interesting facts about AEST?
Queensland does not observe daylight saving time, staying on AEST year-round. Sydney and Melbourne switch to AEDT (UTC+11:00) in summer.
Which cities are in the CST timezone?
Major cities in the CST timezone include Chicago, Houston, Dallas, San Antonio, Mexico City, Austin, Winnipeg, Memphis.
What is the UTC offset for CST?
Central Standard Time (CST) is at UTC-06:00. During daylight saving time, it shifts to CDT.
What should I know about the CST timezone?
CST covers 20 US states fully or partially. Chicago and Houston are the two largest cities in the Central Time Zone.
When is it midnight in AEST, what time is it in Chicago?
When it is 12:00 AM (midnight) in AEST (AEST), it is -15h later in Chicago (CST).
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