Convert CEST to ACST
ACST is 7 hours 30 minutes ahead of CEST. CEST is UTC+2 and ACST is UTC+9:30.
Right now: CEST · ACST
Best time to schedule a meeting
Standard 9–5 working hours overlap for 1 hour: 9:00 AM–10:00 AM CEST (4:00 PM–5:00 PM ACST). Schedule meetings inside that window.
| CEST | ACST | Suitable? |
|---|---|---|
| 9:00 AM | 4:30 PM | working hours |
| 10:00 AM | 5:30 PM | outside 9–5 |
| 11:00 AM | 6:30 PM | outside 9–5 |
| 12:00 PM | 7:30 PM | outside 9–5 |
| 1:00 PM | 8:30 PM | outside 9–5 |
| 2:00 PM | 9:30 PM | outside 9–5 |
| 3:00 PM | 10:30 PM | outside 9–5 |
| 4:00 PM | 11:30 PM | outside 9–5 |
| 5:00 PM | 12:30 AM (next day) | outside 9–5 |
CEST to ACST conversion table
| CEST | ACST |
|---|---|
| 12:00 AM | 7:30 AM |
| 1:00 AM | 8:30 AM |
| 2:00 AM | 9:30 AM |
| 3:00 AM | 10:30 AM |
| 4:00 AM | 11:30 AM |
| 5:00 AM | 12:30 PM |
| 6:00 AM | 1:30 PM |
| 7:00 AM | 2:30 PM |
| 8:00 AM | 3:30 PM |
| 9:00 AM | 4:30 PM |
| 10:00 AM | 5:30 PM |
| 11:00 AM | 6:30 PM |
| 12:00 PM | 7:30 PM |
| 1:00 PM | 8:30 PM |
| 2:00 PM | 9:30 PM |
| 3:00 PM | 10:30 PM |
| 4:00 PM | 11:30 PM |
| 5:00 PM | 12:30 AM (next day) |
| 6:00 PM | 1:30 AM (next day) |
| 7:00 PM | 2:30 AM (next day) |
| 8:00 PM | 3:30 AM (next day) |
| 9:00 PM | 4:30 AM (next day) |
| 10:00 PM | 5:30 AM (next day) |
| 11:00 PM | 6:30 AM (next day) |
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.
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 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 CEST in ACST?
9:00 AM CEST is 4:30 PM ACST.
Is ACST ahead of CEST?
ACST is 7 hours 30 minutes ahead of CEST.
Which time zone does this use?
CEST is UTC+2 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.