Convert PST to ACST
ACST is 17 hours 30 minutes ahead of PST. PST is UTC−8 and ACST is UTC+9:30.
Right now: PST · ACST
Best time to schedule a meeting
Standard 9–5 working hours do not overlap at all between PST and ACST. Someone has to take an early or late call — or use asynchronous communication instead.
| PST | ACST | Suitable? |
|---|---|---|
| 9:00 AM | 2:30 AM (next day) | outside 9–5 |
| 10:00 AM | 3:30 AM (next day) | outside 9–5 |
| 11:00 AM | 4:30 AM (next day) | outside 9–5 |
| 12:00 PM | 5:30 AM (next day) | outside 9–5 |
| 1:00 PM | 6:30 AM (next day) | outside 9–5 |
| 2:00 PM | 7:30 AM (next day) | outside 9–5 |
| 3:00 PM | 8:30 AM (next day) | outside 9–5 |
| 4:00 PM | 9:30 AM (next day) | outside 9–5 |
| 5:00 PM | 10:30 AM (next day) | outside 9–5 |
PST to ACST conversion table
| PST | ACST |
|---|---|
| 12:00 AM | 5:30 PM |
| 1:00 AM | 6:30 PM |
| 2:00 AM | 7:30 PM |
| 3:00 AM | 8:30 PM |
| 4:00 AM | 9:30 PM |
| 5:00 AM | 10:30 PM |
| 6:00 AM | 11:30 PM |
| 7:00 AM | 12:30 AM (next day) |
| 8:00 AM | 1:30 AM (next day) |
| 9:00 AM | 2:30 AM (next day) |
| 10:00 AM | 3:30 AM (next day) |
| 11:00 AM | 4:30 AM (next day) |
| 12:00 PM | 5:30 AM (next day) |
| 1:00 PM | 6:30 AM (next day) |
| 2:00 PM | 7:30 AM (next day) |
| 3:00 PM | 8:30 AM (next day) |
| 4:00 PM | 9:30 AM (next day) |
| 5:00 PM | 10:30 AM (next day) |
| 6:00 PM | 11:30 AM (next day) |
| 7:00 PM | 12:30 PM (next day) |
| 8:00 PM | 1:30 PM (next day) |
| 9:00 PM | 2:30 PM (next day) |
| 10:00 PM | 3:30 PM (next day) |
| 11:00 PM | 4:30 PM (next day) |
About PST
Pacific Standard Time (PST) is UTC−8. It is used in Los Angeles, San Francisco, Seattle and Vancouver in winter.
Pacific Standard Time is UTC−8, used by Los Angeles, San Francisco, Seattle and Vancouver from November to March. As with EST, the abbreviation is written all year in practice — a great deal of software, and most conference invitations from the US west coast, say PST when the sender means PDT. If a time from a US source looks an hour off between March and November, this is almost always why.
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 PST switches to PDT (UTC−7) from March to November. So the 17.5-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 PST in ACST?
9:00 AM PST is 2:30 AM ACST (next day).
Is ACST ahead of PST?
ACST is 17 hours 30 minutes ahead of PST.
Which time zone does this use?
PST is UTC−8 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.