Convert ACST to PDT
PDT is 16 hours 30 minutes behind ACST. ACST is UTC+9:30 and PDT is UTC−7.
Right now: ACST · PDT
Best time to schedule a meeting
Standard 9–5 working hours do not overlap at all between ACST and PDT. Someone has to take an early or late call — or use asynchronous communication instead.
| ACST | PDT | Suitable? |
|---|---|---|
| 9:00 AM | 4:30 PM (previous day) | outside 9–5 |
| 10:00 AM | 5:30 PM (previous day) | outside 9–5 |
| 11:00 AM | 6:30 PM (previous day) | outside 9–5 |
| 12:00 PM | 7:30 PM (previous day) | outside 9–5 |
| 1:00 PM | 8:30 PM (previous day) | outside 9–5 |
| 2:00 PM | 9:30 PM (previous day) | outside 9–5 |
| 3:00 PM | 10:30 PM (previous day) | outside 9–5 |
| 4:00 PM | 11:30 PM (previous day) | outside 9–5 |
| 5:00 PM | 12:30 AM | outside 9–5 |
ACST to PDT conversion table
| ACST | PDT |
|---|---|
| 12:00 AM | 7:30 AM (previous day) |
| 1:00 AM | 8:30 AM (previous day) |
| 2:00 AM | 9:30 AM (previous day) |
| 3:00 AM | 10:30 AM (previous day) |
| 4:00 AM | 11:30 AM (previous day) |
| 5:00 AM | 12:30 PM (previous day) |
| 6:00 AM | 1:30 PM (previous day) |
| 7:00 AM | 2:30 PM (previous day) |
| 8:00 AM | 3:30 PM (previous day) |
| 9:00 AM | 4:30 PM (previous day) |
| 10:00 AM | 5:30 PM (previous day) |
| 11:00 AM | 6:30 PM (previous day) |
| 12:00 PM | 7:30 PM (previous day) |
| 1:00 PM | 8:30 PM (previous day) |
| 2:00 PM | 9:30 PM (previous day) |
| 3:00 PM | 10:30 PM (previous day) |
| 4:00 PM | 11:30 PM (previous day) |
| 5:00 PM | 12:30 AM |
| 6:00 PM | 1:30 AM |
| 7:00 PM | 2:30 AM |
| 8:00 PM | 3:30 AM |
| 9:00 PM | 4:30 AM |
| 10:00 PM | 5:30 AM |
| 11:00 PM | 6:30 AM |
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 PDT
Pacific Daylight Time (PDT) is UTC−7. It is used in Los Angeles, San Francisco and Seattle from March to November.
Pacific Daylight Time is UTC−7, the summer clock for Los Angeles, San Francisco, Seattle and Vancouver. It is the zone most product launches and software release times are quoted in, and it is worth converting rather than eyeballing: PDT is eight hours behind British Summer Time, not seven, because both sides have moved.
Does this gap change with the seasons?
This gap is seasonal. The abbreviations themselves are fixed offsets, but the region on PDT switches to PST (UTC−8) from November to March. So the 16.5-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 PDT?
9:00 AM ACST is 4:30 PM PDT (previous day).
Is PDT ahead of ACST?
PDT is 16 hours 30 minutes behind ACST.
Which time zone does this use?
ACST is UTC+9:30 and PDT is UTC−7. 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.