Convert CDT to ACDT
ACDT is 15 hours 30 minutes ahead of CDT. CDT is UTC−5 and ACDT is UTC+10:30.
Right now: CDT · ACDT
Best time to schedule a meeting
Standard 9–5 working hours do not overlap at all between CDT and ACDT. Someone has to take an early or late call — or use asynchronous communication instead.
| CDT | ACDT | Suitable? |
|---|---|---|
| 9:00 AM | 12:30 AM (next day) | outside 9–5 |
| 10:00 AM | 1:30 AM (next day) | outside 9–5 |
| 11:00 AM | 2:30 AM (next day) | outside 9–5 |
| 12:00 PM | 3:30 AM (next day) | outside 9–5 |
| 1:00 PM | 4:30 AM (next day) | outside 9–5 |
| 2:00 PM | 5:30 AM (next day) | outside 9–5 |
| 3:00 PM | 6:30 AM (next day) | outside 9–5 |
| 4:00 PM | 7:30 AM (next day) | outside 9–5 |
| 5:00 PM | 8:30 AM (next day) | outside 9–5 |
CDT to ACDT conversion table
| CDT | ACDT |
|---|---|
| 12:00 AM | 3:30 PM |
| 1:00 AM | 4:30 PM |
| 2:00 AM | 5:30 PM |
| 3:00 AM | 6:30 PM |
| 4:00 AM | 7:30 PM |
| 5:00 AM | 8:30 PM |
| 6:00 AM | 9:30 PM |
| 7:00 AM | 10:30 PM |
| 8:00 AM | 11:30 PM |
| 9:00 AM | 12:30 AM (next day) |
| 10:00 AM | 1:30 AM (next day) |
| 11:00 AM | 2:30 AM (next day) |
| 12:00 PM | 3:30 AM (next day) |
| 1:00 PM | 4:30 AM (next day) |
| 2:00 PM | 5:30 AM (next day) |
| 3:00 PM | 6:30 AM (next day) |
| 4:00 PM | 7:30 AM (next day) |
| 5:00 PM | 8:30 AM (next day) |
| 6:00 PM | 9:30 AM (next day) |
| 7:00 PM | 10:30 AM (next day) |
| 8:00 PM | 11:30 AM (next day) |
| 9:00 PM | 12:30 PM (next day) |
| 10:00 PM | 1:30 PM (next day) |
| 11:00 PM | 2:30 PM (next day) |
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.
About ACDT
Australian Central Daylight Time (ACDT) is UTC+10:30. It is used in Adelaide in summer.
Australian Central Daylight Time is UTC+10:30, what South Australia keeps from October to April. Darwin stays on ACST through the summer, so for those months two cities in the same nominal zone are an hour apart — the only reason to be precise about which of the two abbreviations a meeting invitation carries.
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 15.5-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.
ACDT does not shift, so the whole change comes from one side. A recurring meeting fixed in ACDT 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 CDT in ACDT?
9:00 AM CDT is 12:30 AM ACDT (next day).
Is ACDT ahead of CDT?
ACDT is 15 hours 30 minutes ahead of CDT.
Which time zone does this use?
CDT is UTC−5 and ACDT is UTC+10:30. 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.