PT to ACST Converter
South Australia is on daylight saving time: ACDT (UTC+10:30) until Sun, Apr 4, 2027.
The Northern Territory stays on ACST (UTC+9:30).
Start by searching for a time zone, city, or town.
Add one or more places to compare local times, adjust the date, and share the result.
Quick answers
Selected conversion
4:00 am04:00 PT (UTC-8), Nov 13, 2026 = 9:30 pm21:30 ACST (UTC+9:30), Nov 13, 2026
PT is 17 hours and 30 minutes behind ACST.
How the time difference changes
For most of the year, PT is 16 hours and 30 minutes behind ACST. From Nov 1, 2026 to Mar 14, 2027, and from Nov 7, 2027 to Mar 12, 2028, PT is 17 hours and 30 minutes behind ACST.
For most of the year, working hours of 9:00 am to 6:00 pm in PT correspond to 1:30 am (next day) to 10:30 am (next day) in ACST. At other times of the year, working hours of 9:00 am to 6:00 pm in PT correspond to 2:30 am (next day) to 11:30 am (next day) in ACST.For most of the year, working hours of 09:00 to 18:00 in PT correspond to 01:30 (next day) to 10:30 (next day) in ACST. At other times of the year, working hours of 09:00 to 18:00 in PT correspond to 02:30 (next day) to 11:30 (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-6pm15:30-18:00 in PT which corresponds to 9am-11:30am09:00-11:30 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
Choose an hour to update the converter. Day labels such as “next day” or “+1” are relative to the selected date in the first column. Use Up and Down arrow keys, Home or End to move between hours, then Enter or Space to select.
| PT | ACST |
|---|---|
| 5:30pm | |
| 6:30pm | |
| 7:30pm | |
| 8:30pm | |
| 9:30pm | |
| 10:30pm | |
| 11:30pm | |
| 12:30am next day | |
| 1:30am next day | |
| 2:30am next day | |
| 3:30am next day | |
| 4:30am next day | |
| 5:30am next day | |
| 6:30am next day | |
| 7:30am next day | |
| 8:30am next day | |
| 9:30am next day | |
| 10:30am next day | |
| 11:30am next day | |
| 12:30pm next day | |
| 1:30pm next day | |
| 2:30pm next day | |
| 3:30pm next day | |
| 4:30pm next day | |
| 17:30 | |
| 18:30 | |
| 19:30 | |
| 20:30 | |
| 21:30 | |
| 22:30 | |
| 23:30 | |
| 00:30 next day | |
| 01:30 next day | |
| 02:30 next day | |
| 03:30 next day | |
| 04:30 next day | |
| 05:30 next day | |
| 06:30 next day | |
| 07:30 next day | |
| 08:30 next day | |
| 09:30 next day | |
| 10:30 next day | |
| 11:30 next day | |
| 12:30 next day | |
| 13:30 next day | |
| 14:30 next day | |
| 15:30 next day | |
| 16:30 next day |
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 North America. 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 United States and the Northwestern part of Mexico. From November 1, 2026, most of British Columbia in Canada keeps UTC-7 all year instead.
Countries using this time zone: Mexico, United States
Principal Cities: The largest city in the PT time zone is Los Angeles in the United States, with about 3.821 million people. Other major cities in this time zone include Tijuana, San Diego, Mexicali, 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 of Greenwich Mean Time (GMT).
Countries using this time zone: Australia
Principal Cities: The largest city in the ACST time zone is Adelaide in Australia, with about 1.469 million people. Other major cities in this time zone include Darwin, Palmerston, Alice Springs, Mount Gambier.
Today the lighter areas are on UTC+10:30 (ACDT).
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 4, 2026 at 2:00 am02:00 local time and clocks were set one hour forward to Sunday, October 4, 2026, 3:00 am03:00 local daylight time instead. Standard time ends annually on the first Sunday of October.
Start: Australian Central Standard Time (ACST) starts on Sunday, April 4, 2027 at 3:00 am03:00 local time and clocks are set one hour back to Sunday, April 4, 2027, 2:00 am02:00. Standard time starts annually on the first Sunday of April.
See Australia daylight saving time and upcoming clock changes worldwide.
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