ACST to Chicago
-14h 30mACST
ACSTSOURCEChicago
CDTGreen rows indicate typical business hours (9 AM - 5 PM)
ACST and CDT on the World Map
The map below highlights the ACST (Australian Central Standard Time) and CDT (Central Standard Time) timezone regions across the globe.
ACST – Australian Central Standard Time
UTC+09:30Australian Central Standard Time (ACST, UTC+09:30) covers South Australia and the Northern Territory, on a half-hour offset.
- •ACST uses a half-hour offset: UTC+09:30.
- •South Australia moves to ACDT (UTC+10:30) in summer; the Northern Territory does not.
- •Adelaide and Darwin are 30 minutes apart during daylight saving, level in winter.
- •Adelaide is one of the few major cities on a 30-minute offset.
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.
ACST to Chicago Time Difference – Complete Guide
ACST runs on Australian Central Standard Time (ACST) at UTC+09:30. Chicago runs on Central Daylight Time (CDT) at UTC-05:00, also currently on daylight saving time. That puts ACST 14 hours 30 minutes behind Chicago — a difference of -14h 30m at the current offsets.
In practice, when it is 9:00 AM in ACST it is 6:30 PM in Chicago on the previous day. Midnight in ACST is 9:30 AM in Chicago.Chicago observes daylight saving time while ACST does not, so the gap narrows or widens by an hour part of the year.
ACST to Chicago time conversion table
| ACST (ACST) | Chicago (CDT) | Day |
|---|---|---|
| 12:00 AM | 9:30 AM | previous day |
| 6:00 AM | 3:30 PM | previous day |
| 7:00 AM | 4:30 PM | previous day |
| 8:00 AM | 5:30 PM | previous day |
| 9:00 AM | 6:30 PM | previous day |
| 12:00 PM | 9:30 PM | previous day |
| 3:00 PM | 12:30 AM | same day |
| 5:00 PM | 2:30 AM | same day |
| 6:00 PM | 3:30 AM | same day |
| 9:00 PM | 6:30 AM | same day |
Why people convert ACST to Chicago time
- Scheduling a call from ACST to Chicago: a 10:00 AM start in ACST lands at 7:30 PM in Chicago the previous day, so you can confirm the slot without doing the arithmetic yourself.
- Handling a -14h 30m gap: ACST 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 6:30 PM in ACST.
- Coordinating a ACST-based team with Chicago contacts: quoting times in the other side's local clock — not your own — removes the single biggest source of missed meetings.
- Always state the zone abbreviation, not just the hour. "3:00 PM ACST" is unambiguous; "3 PM" across a -14h 30m gap is not.
- With a -14h 30m gap there is no shared 9-to-5 window, so alternate the early start: one week ACST 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 ACST (Australian Central Standard Time)
Australian Central Standard Time (ACST) is the half-hour offset of UTC+09:30 used across South Australia and the Northern Territory, taking in Adelaide and Darwin. South Australia moves to Australian Central Daylight Time (ACDT, UTC+10:30) from the first Sunday in October to the first Sunday in April, but the Northern Territory does not observe daylight saving — so Adelaide and Darwin sit 30 minutes apart in summer and level with each other in winter. The half-hour offset means Adelaide is 30 minutes behind Sydney in winter and level with it during daylight saving, which regularly catches out travellers and meeting planners.
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 ACST and Chicago
With a -14h 30m offset there is no overlap inside a normal 9 AM – 5 PM day. Chicago opens at 9:00 AM CDT, which is 6:30 PM in ACST, so real-time calls need an early-morning or late-evening slot on one side.
Business hours overlap
ACST and Chicago have no shared working hours because of the -14h 30m gap. Teams need to alternate early starts or rely on asynchronous handovers.
ACST is 14 hours 30 minutes behind Chicago (ACST UTC+09:30 → 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
ACST
❄ Currently in Standard Time
Standard: UTC+09:30 · DST: UTC+10:30
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 ACST and Chicago?
ACST (ACST, UTC+09:30) is 14 hours 30 minutes behind Chicago (CDT, UTC-05:00). The gap is currently -14h 30m.
How do I convert ACST time to Chicago time?
Add -14h 30m to ACST local time. For example, 9:00 AM in ACST is 6:30 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 -14h 30m offset from ACST.
What is the best time to call Chicago from ACST?
There is no shared working-hours window because of the -14h 30m gap. The closest option is 1:00 PM in ACST, which is 10:30 PM in Chicago.
Which is behind, ACST or Chicago?
ACST is 14 hours 30 minutes behind Chicago. When it is 12:00 PM in ACST it is 9:30 PM in Chicago.
Do ACST and Chicago use different time zones?
ACST uses ACST at UTC+09:30, while Chicago (USA) uses CDT at UTC-05:00. The IANA identifiers are Australia/Adelaide and America/Chicago.
Does daylight saving time affect the ACST–Chicago difference?
Yes at the moment: Chicago is on daylight saving time and ACST is not, so the -14h 30m gap shifts by an hour when exactly one of them changes clocks.
Which other cities share ACST's time zone?
ACST also covers Adelaide, Darwin, Alice Springs, Mount Gambier.
Which countries use ACST, ACST's zone?
ACST is used in Australia (South Australia, Northern Territory).
Is there a day difference between ACST and Chicago?
Sometimes. The -14h 30m gap is large enough that 8:00 PM or later in ACST already falls on the in Chicago.
What is the time difference between ACST and Chicago?
Chicago is -14h 30m from ACST.
What timezone is ACST in?
ACST 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 ACST (Australian Central Standard Time)?
ACST is used in Australia (South Australia, Northern Territory).
Does ACST observe daylight saving time?
Yes, ACST switches to ACDT during summer months.
What are some interesting facts about ACST?
ACST uses a half-hour offset: UTC+09:30. South Australia moves to ACDT (UTC+10:30) in summer; the Northern Territory does not.
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 ACST, what time is it in Chicago?
When it is 12:00 AM (midnight) in ACST (ACST), it is -14h 30m later in Chicago (CST).
Related Developer Tools
Explore more tools that work great with timezone conversions for international teams:
Related Timezone Conversions
More ACST time conversions
- acst to new york
- acst to london
- acst to dubai
- acst to tokyo
- acst to singapore
- acst to sydney
- acst to los angeles
- acst to paris
- acst to delhi
- acst to mumbai
- acst to berlin
- acst to hong kong
- acst to toronto
- acst to kathmandu
- new york to acst
- london to acst
- dubai to acst
- tokyo to acst
- singapore to acst
- sydney to acst
- los angeles to acst
- paris to acst
- delhi to acst
- mumbai to acst
- berlin to acst
- hong kong to acst
- toronto to acst
- kathmandu to acst
See every conversion from ACST →·See every conversion from Chicago →