Convert ACST to CDT
CDT is 14 hours 30 minutes behind ACST. ACST is UTC+9:30 and CDT is UTC−5.
Right now: ACST · CDT
Best time to schedule a meeting
Standard 9–5 working hours do not overlap at all between ACST and CDT. Someone has to take an early or late call — or use asynchronous communication instead.
| ACST | CDT | Suitable? |
|---|---|---|
| 9:00 AM | 6:30 PM (previous day) | outside 9–5 |
| 10:00 AM | 7:30 PM (previous day) | outside 9–5 |
| 11:00 AM | 8:30 PM (previous day) | outside 9–5 |
| 12:00 PM | 9:30 PM (previous day) | outside 9–5 |
| 1:00 PM | 10:30 PM (previous day) | outside 9–5 |
| 2:00 PM | 11:30 PM (previous day) | outside 9–5 |
| 3:00 PM | 12:30 AM | outside 9–5 |
| 4:00 PM | 1:30 AM | outside 9–5 |
| 5:00 PM | 2:30 AM | outside 9–5 |
ACST to CDT conversion table
| ACST | CDT |
|---|---|
| 12:00 AM | 9:30 AM (previous day) |
| 1:00 AM | 10:30 AM (previous day) |
| 2:00 AM | 11:30 AM (previous day) |
| 3:00 AM | 12:30 PM (previous day) |
| 4:00 AM | 1:30 PM (previous day) |
| 5:00 AM | 2:30 PM (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) |
| 10:00 AM | 7:30 PM (previous day) |
| 11:00 AM | 8:30 PM (previous day) |
| 12:00 PM | 9:30 PM (previous day) |
| 1:00 PM | 10:30 PM (previous day) |
| 2:00 PM | 11:30 PM (previous day) |
| 3:00 PM | 12:30 AM |
| 4:00 PM | 1:30 AM |
| 5:00 PM | 2:30 AM |
| 6:00 PM | 3:30 AM |
| 7:00 PM | 4:30 AM |
| 8:00 PM | 5:30 AM |
| 9:00 PM | 6:30 AM |
| 10:00 PM | 7:30 AM |
| 11:00 PM | 8:30 AM |
About ACST
Australian Central Standard Time (ACST) is UTC+9:30. It is used in Adelaide and Darwin in winter.
Australian Central Standard Time is UTC+9:30, half an hour behind the eastern states rather than a whole hour, which surprises people every time. South Australia moves to daylight saving in October and the Northern Territory does not, so Adelaide and Darwin share this offset for half the year and are an hour apart for the other half.
About CDT
Central Daylight Time (CDT) is UTC−5. It is used in Chicago, Dallas and Houston from March to November.
Central Daylight Time is UTC−5, the summer clock for Chicago, Dallas and Houston, from the second Sunday in March to the first Sunday in November. Mexico is the complication: it abolished daylight saving nationally in 2022, so Mexico City stays on UTC−6 all year and is now an hour behind Chicago for eight months of the year rather than matching it.
Does this gap change with the seasons?
This gap is seasonal. The abbreviations themselves are fixed offsets, but the region on CDT switches to CST (UTC−6) from November to March. So the 14.5-hour figure on this page is correct for the part of the year when both places are actually on these abbreviations, and changes by an hour outside it.
ACST does not shift, so the whole change comes from one side. A recurring meeting fixed in ACST will appear to move by an hour for everyone on the other side, twice a year, without anyone changing anything.
This is the reason scheduling systems store an IANA zone such as Region/City rather than an offset or an abbreviation: the zone knows its own rules and the offset does not.
Frequently asked questions
What time is 9:00 AM ACST in CDT?
9:00 AM ACST is 6:30 PM CDT (previous day).
Is CDT ahead of ACST?
CDT is 14 hours 30 minutes behind ACST.
Which time zone does this use?
ACST is UTC+9:30 and CDT is UTC−5. Both abbreviations denote a single fixed offset, so this conversion never shifts with daylight saving — what changes is which abbreviation a place is using at the time.