CST to AEST Converter & Meeting Planner
Quick answer: 9:00 AM CST = 1:00 AM AEST (fixed -06:00 standard offset — not DST-adjusted). Use the interactive converter below for DST-aware local-time scheduling.
Planning a call or meeting between Central Standard Time (CST) and Australian Eastern Standard Time (AEST)? You need to account for the standard time difference. Australian Eastern Standard Time is normally 16 hours ahead of Central Standard Time. Whether you are coordinating between teams in Chicago and Dallas and Sydney and Melbourne, our live tool has you covered. Use our interactive overlap studio below to find the perfect waking hours for both regions, taking into account any seasonal Daylight Saving Time (DST) changes.
24-Hour Conversion Table
Quick reference: 12:00 AM CST = 4:00 PM AEST. The full 24-hour CST to AEST table below uses fixed standard offsets for exact abbreviation searches.
Example: 3:00 PM CST = 7:00 AM AEST (+1 day).
| CST Time | AEST Time |
|---|---|
| 12:00 AM (00:00) | 4:00 PM (16:00) |
| 1:00 AM (01:00) | 5:00 PM (17:00) |
| 2:00 AM (02:00) | 6:00 PM (18:00) |
| 3:00 AM (03:00) | 7:00 PM (19:00) |
| 4:00 AM (04:00) | 8:00 PM (20:00) |
| 5:00 AM (05:00) | 9:00 PM (21:00) |
| 6:00 AM (06:00) | 10:00 PM (22:00) |
| 7:00 AM (07:00) | 11:00 PM (23:00) |
| 8:00 AM (08:00) | 12:00 AM (00:00)+1 day |
| 9:00 AM (09:00) | 1:00 AM (01:00)+1 day |
| 10:00 AM (10:00) | 2:00 AM (02:00)+1 day |
| 11:00 AM (11:00) | 3:00 AM (03:00)+1 day |
| 12:00 PM (12:00) | 4:00 AM (04:00)+1 day |
| 1:00 PM (13:00) | 5:00 AM (05:00)+1 day |
| 2:00 PM (14:00) | 6:00 AM (06:00)+1 day |
| 3:00 PM (15:00) | 7:00 AM (07:00)+1 day |
| 4:00 PM (16:00) | 8:00 AM (08:00)+1 day |
| 5:00 PM (17:00) | 9:00 AM (09:00)+1 day |
| 6:00 PM (18:00) | 10:00 AM (10:00)+1 day |
| 7:00 PM (19:00) | 11:00 AM (11:00)+1 day |
| 8:00 PM (20:00) | 12:00 PM (12:00)+1 day |
| 9:00 PM (21:00) | 1:00 PM (13:00)+1 day |
| 10:00 PM (22:00) | 2:00 PM (14:00)+1 day |
| 11:00 PM (23:00) | 3:00 PM (15:00)+1 day |
Best time to call Sydney from Chicago
For most work calls, compare the normal business day in Chicago (CST) with the business day in Sydney (AEST). CST commonly covers North America, Central America, while AEST is mainly associated with Oceania, Australia.
⚠️ Note: 2026-07-05 is not a normal workday in one or both regions based on their configured calendar. The overlap below should be treated as a reference, not a guaranteed office-hours window.
⚠️ There is no clean same-day business-hours overlap on 2026-07-05. A practical compromise is around 6:00 PM CST, which reaches 9:00 AM AEST near the start of their workday.
- DST Safety: CST or AEST may shift during Daylight Saving Time. Always confirm the converted time for your specific date.
- Australian Securities Exchange (ASX): 10:00-16:00 local time in Sydney.
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Frequently Asked Questions
What is the time difference between CST and AEST?
During standard time, Australian Eastern Standard Time is 16 hours ahead of Central Standard Time.
Is CST the same as Central Time (CT)?
Central Time (CT) is the umbrella term for the zone, while CST and CDT refer to its two seasonal offsets. CST (UTC-6) applies during standard time from November through March, and CDT (UTC-5) applies during Daylight Saving Time from March through November.
Does Mexico City use CST?
Mexico City operates on UTC-6, the same offset as CST, but it does not observe Daylight Saving Time following Mexico's elimination of the practice under a 2022 law. This means Mexico City stays at UTC-6 year-round while US and Canadian Central Time cities shift to UTC-5 each summer.
Does all of eastern Australia observe Daylight Saving Time?
No — eastern Australia is split on DST. New South Wales (Sydney), Victoria (Melbourne), Tasmania (Hobart), and the ACT (Canberra) advance their clocks to AEDT (UTC+11) each October, while Queensland (Brisbane) opts out entirely and remains on AEST (UTC+10) year-round. This means Sydney and Brisbane run on the same clock for only part of the year.
What is the difference between AEST and AEDT?
AEST (Australian Eastern Standard Time) is the UTC+10:00 offset observed during the Southern Hemisphere winter months, roughly April through October. AEDT (Australian Eastern Daylight Time) is the UTC+11:00 offset applied during the Southern Hemisphere summer when clocks spring forward in October, observed by New South Wales, Victoria, Tasmania, and the ACT.