Convert ACST to CEST
CEST is 7 hours 30 minutes behind ACST. ACST is UTC+9:30 and CEST is UTC+2.
Right now: ACST · CEST
Best time to schedule a meeting
Standard 9–5 working hours do not overlap at all between ACST and CEST. Someone has to take an early or late call — or use asynchronous communication instead.
| ACST | CEST | Suitable? |
|---|---|---|
| 9:00 AM | 1:30 AM | outside 9–5 |
| 10:00 AM | 2:30 AM | outside 9–5 |
| 11:00 AM | 3:30 AM | outside 9–5 |
| 12:00 PM | 4:30 AM | outside 9–5 |
| 1:00 PM | 5:30 AM | outside 9–5 |
| 2:00 PM | 6:30 AM | outside 9–5 |
| 3:00 PM | 7:30 AM | outside 9–5 |
| 4:00 PM | 8:30 AM | outside 9–5 |
| 5:00 PM | 9:30 AM | working hours |
ACST to CEST conversion table
| ACST | CEST |
|---|---|
| 12:00 AM | 4:30 PM (previous day) |
| 1:00 AM | 5:30 PM (previous day) |
| 2:00 AM | 6:30 PM (previous day) |
| 3:00 AM | 7:30 PM (previous day) |
| 4:00 AM | 8:30 PM (previous day) |
| 5:00 AM | 9:30 PM (previous day) |
| 6:00 AM | 10:30 PM (previous day) |
| 7:00 AM | 11:30 PM (previous day) |
| 8:00 AM | 12:30 AM |
| 9:00 AM | 1:30 AM |
| 10:00 AM | 2:30 AM |
| 11:00 AM | 3:30 AM |
| 12:00 PM | 4:30 AM |
| 1:00 PM | 5:30 AM |
| 2:00 PM | 6:30 AM |
| 3:00 PM | 7:30 AM |
| 4:00 PM | 8:30 AM |
| 5:00 PM | 9:30 AM |
| 6:00 PM | 10:30 AM |
| 7:00 PM | 11:30 AM |
| 8:00 PM | 12:30 PM |
| 9:00 PM | 1:30 PM |
| 10:00 PM | 2:30 PM |
| 11:00 PM | 3:30 PM |
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 CEST
Central European Summer Time (CEST) is UTC+2. It is used in Paris, Berlin, Madrid and Rome from late March to late October.
Central European Summer Time is UTC+2, in force from the last Sunday in March to the last Sunday in October. The European changeover happens at 01:00 UTC everywhere simultaneously, unlike the US which changes at 2am local time in each zone — so Europe's internal offsets never break during the transition, while North America's briefly do.
Does this gap change with the seasons?
This gap is seasonal. The abbreviations themselves are fixed offsets, but the region on CEST switches to CET (UTC+1) from late October to late March. So the 7.5-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 CEST?
9:00 AM ACST is 1:30 AM CEST.
Is CEST ahead of ACST?
CEST is 7 hours 30 minutes behind ACST.
Which time zone does this use?
ACST is UTC+9:30 and CEST is UTC+2. 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.