How many hours is PST behind ACDT?
As abbreviations, ACDT is always 18.5 hours ahead of PST: PST is UTC−8 and ACDT is UTC+10:30. To convert, add 18.5 hours.
Check which label you actually need: PST (Pacific Time is on PDT today) and ACDT (Australian Central Time is on ACST today). A time written with an abbreviation that is not in use is usually meant as the local time, so convert between the places instead: right now ACDT is 16.5 hours ahead of PST.
When the PST to ACDT time difference changes
For most of the year ACDT is 16.5 hours ahead of PST. From 4 October to 31 October 2026, ACDT is 17.5 hours ahead of PST instead, because the two places change their clocks on different dates. Meetings booked by the usual gap land an hour off in those weeks.
| Dates | ACDT vs PST | Length |
|---|---|---|
| 5 April 2026 to 3 October 2026 | 16.5 hours ahead | 182 days |
| 4 October 2026 to 31 October 2026 | 17.5 hours ahead | 28 days |
| 1 November 2026 to 31 December 2026 | 18.5 hours ahead | 61 days |
| 1 January 2027 to 13 March 2027 | 18.5 hours ahead | 72 days |
| 14 March 2027 to 3 April 2027 | 17.5 hours ahead | 21 days |
| 4 April 2027 to 2 October 2027 | 16.5 hours ahead | 182 days |
| 3 October 2027 to 6 November 2027 | 17.5 hours ahead | 35 days |
| 7 November 2027 to 31 December 2027 | 18.5 hours ahead | 55 days |
Best time for a meeting between PST and ACDT
- When ACDT is 16.5 hours ahead of PST: no shared 09:00 to 17:00 hours; try 17:00 in PST (09:30 in ACDT).
- When ACDT is 18.5 hours ahead of PST: no shared 09:00 to 17:00 hours; one side has to take the call outside office hours.
- When ACDT is 17.5 hours ahead of PST: no shared 09:00 to 17:00 hours; one side has to take the call outside office hours.