Convert CET to ACST
ACST is 8 hours 30 minutes ahead of CET. CET is UTC+1 and ACST is UTC+9:30.
Right now: CET · ACST
Best time to schedule a meeting
Standard 9–5 working hours do not overlap at all between CET and ACST. Someone has to take an early or late call — or use asynchronous communication instead.
| CET | ACST | Suitable? |
|---|---|---|
| 9:00 AM | 5:30 PM | outside 9–5 |
| 10:00 AM | 6:30 PM | outside 9–5 |
| 11:00 AM | 7:30 PM | outside 9–5 |
| 12:00 PM | 8:30 PM | outside 9–5 |
| 1:00 PM | 9:30 PM | outside 9–5 |
| 2:00 PM | 10:30 PM | outside 9–5 |
| 3:00 PM | 11:30 PM | outside 9–5 |
| 4:00 PM | 12:30 AM (next day) | outside 9–5 |
| 5:00 PM | 1:30 AM (next day) | outside 9–5 |
CET to ACST conversion table
| CET | ACST |
|---|---|
| 12:00 AM | 8:30 AM |
| 1:00 AM | 9:30 AM |
| 2:00 AM | 10:30 AM |
| 3:00 AM | 11:30 AM |
| 4:00 AM | 12:30 PM |
| 5:00 AM | 1:30 PM |
| 6:00 AM | 2:30 PM |
| 7:00 AM | 3:30 PM |
| 8:00 AM | 4:30 PM |
| 9:00 AM | 5:30 PM |
| 10:00 AM | 6:30 PM |
| 11:00 AM | 7:30 PM |
| 12:00 PM | 8:30 PM |
| 1:00 PM | 9:30 PM |
| 2:00 PM | 10:30 PM |
| 3:00 PM | 11:30 PM |
| 4:00 PM | 12:30 AM (next day) |
| 5:00 PM | 1:30 AM (next day) |
| 6:00 PM | 2:30 AM (next day) |
| 7:00 PM | 3:30 AM (next day) |
| 8:00 PM | 4:30 AM (next day) |
| 9:00 PM | 5:30 AM (next day) |
| 10:00 PM | 6:30 AM (next day) |
| 11:00 PM | 7:30 AM (next day) |
About CET
Central European Time (CET) is UTC+1. It is used in Paris, Berlin, Madrid, Rome and Warsaw in winter.
Central European Time is UTC+1 and covers most of continental Europe in winter — Paris, Berlin, Madrid, Rome, Warsaw. It is worth noting how much of the continent this is: Spain sits geographically west of Britain but runs an hour ahead of it, a legacy of a 1940 decision that was never reversed. From late March to late October the same countries are on CEST, UTC+2.
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.
Does this gap change with the seasons?
This gap is seasonal. The abbreviations themselves are fixed offsets, but the region on CET switches to CEST (UTC+2) from late March to late October. So the 8.5-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 CET in ACST?
9:00 AM CET is 5:30 PM ACST.
Is ACST ahead of CET?
ACST is 8 hours 30 minutes ahead of CET.
Which time zone does this use?
CET is UTC+1 and ACST is UTC+9:30. 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.