PT to ACST Converter
ACST is not used on this date
This converter keeps ACST at GMT +9:30. Adelaide uses ACDT (GMT +10:30) on this date. Open the ACDT converter, or choose Adelaide, Adelaide Hills, or Mount Gambier for city-specific time.Quick answers
Selected conversion
The selected date and time will appear here when the converter loads.
How the time difference changes
For most of the year, PT is 16 hours and 30 minutes behind ACST. At other times of the year, PT is 17 hours and 30 minutes behind ACST.
For most of the year, working hours of 9:00 am to 5:00 pm in PT correspond to 1:30 am (next day) to 9:30 am (next day) in ACST. At other times of the year, working hours of 9:00 am to 5:00 pm in PT correspond to 2:30 am (next day) to 10:30 am (next day) in ACST.
Compare PT time with ACST time, including current local time, UTC offsets, time difference, daylight saving changes, working hours, and shareable meeting times.
Time Difference
Pacific Time is 17 hours and 30 minutes behind Australian Central Standard Time
4:00 am04:00 in PT is 9:30 pm21:30 in ACST
PT to ACST call time
Best time for a conference call or a meeting is between 3:30pm-5pm in PT which corresponds to 9am-10:30am in ACST (next day)
4:00 am04:00 Pacific Time (PT). Offset UTC -8:00 hours
9:30 pm21:30 Australian Central Standard Time (ACST). Offset UTC +9:30 hours
4:00 am04:00 PT / 9:30 pm21:30 ACST
| PT | ACST |
|---|---|
| 12am (midnight) | 5:30 pm |
| 1am | 6:30 pm |
| 2am | 7:30 pm |
| 3am | 8:30 pm |
| 4am | 9:30 pm |
| 5am | 10:30 pm |
| 6am | 11:30 pm |
| 7am | 12:30 am |
| 8am | 1:30 am |
| 9am | 2:30 am |
| 10am | 3:30 am |
| 11am | 4:30 am |
| 12pm (noon) | 5:30 am |
| 1pm | 6:30 am |
| 2pm | 7:30 am |
| 3pm | 8:30 am |
| 4pm | 9:30 am |
| 5pm | 10:30 am |
| 6pm | 11:30 am |
| 7pm | 12:30 pm |
| 8pm | 1:30 pm |
| 9pm | 2:30 pm |
| 10pm | 3:30 pm |
| 11pm | 4:30 pm |
| 00:00 | 17:30 |
| 01:00 | 18:30 |
| 02:00 | 19:30 |
| 03:00 | 20:30 |
| 04:00 | 21:30 |
| 05:00 | 22:30 |
| 06:00 | 23:30 |
| 07:00 | 00:30 |
| 08:00 | 01:30 |
| 09:00 | 02:30 |
| 10:00 | 03:30 |
| 11:00 | 04:30 |
| 12:00 | 05:30 |
| 13:00 | 06:30 |
| 14:00 | 07:30 |
| 15:00 | 08:30 |
| 16:00 | 09:30 |
| 17:00 | 10:30 |
| 18:00 | 11:30 |
| 19:00 | 12:30 |
| 20:00 | 13:30 |
| 21:00 | 14:30 |
| 22:00 | 15:30 |
| 23:00 | 16:30 |
Pacific Time
Pacific Time (PT) is a general term used to describe the areas that observe either the Pacific Standard Time (PST) or Pacific Daylight Time (PDT) in the United States and Canada. PT also called Pacific Coast Time. PT is not static but switches between PDT and PST.
Territories observing the Pacific Time Zone are primarily in North America. It runs through the western part of Canada, the United States and the Northwestern part of Mexico.
Countries using this time zone: Canada, Mexico, United States.
Principal Cities: The largest city in the PST time zone is Los Angeles in the United States, with about 3.793 million people. Other major cities in this time zone include Vancouver, Tijuana, San Diego, San Jose.
French: HNP - Heure Normale du Pacifique
Spanish: PT - Tiempo del Pacífico, PT - Zona Noroeste
PT representations, usage and related time zones
- -08 - basic short
- -0800 - basic
- -08:00 - extended
- -0800 - sign character (-) followed by a four digit time providing hours (08) and minutes (00) of the offset. Indicates an offset of eight hours to the west of the zero meridian.
- Uniform - Military abbreviation for PT
- U - short form of 'Uniform'
- AKDT - Alaska Daylight Time
- PST - Pacific Standard Time
- PT - Pacific Time
- PST - Pitcairn Standard Time
- U - Uniform Time Zone
Australian Central Standard Time
Offset: ACST is 9 hours and 30 minutes ahead Greenwich Mean Time (GMT) and is used in Australia
Countries using this time zone: Australia
Principal Cities: The largest city in the ACST time zone is Darwin in Australia, with about 139,902 people. Other major cities in this time zone include Palmerston, Alice Springs.
Daylight Saving: This is a standard time zone. During summer, some places set clocks forward one hour for daylight saving time and observe Australian Central Daylight Time (ACDT).
End: Australian Central Standard Time (ACST) ended on Sunday, October 5, 2025 at 2:00 am local time and clocks were set one hour forward to Sunday, October 5, 2025, 3:00 am local daylight time instead. Standard time ends annually on the first Sunday of October.
Start: Australian Central Standard Time (ACST) starts on Sunday, April 5, 2026 at 3:00 am local time and clocks are set one hour back to Sunday, April 5, 2026, 2:00 am. Standard time starts annually on the first Sunday of April.
ACST representations, usage and related time zones
- +0930 - basic
- +09:30 - extended
- +0930 - sign character (+) followed by a four digit time providing hours (09) and minutes (30) of the offset. Indicates an offset of nine hours and thirty minutes to the east of the zero meridian.
- Australia/Adelaide
- Australia/Broken_Hill
- Australia/Darwin
- Australia/North
- Australia/South
- Australia/Yancowinna