What is the time difference between ACST and PST?

Pacific Standard Time (PST) is 17 hours and 30 minutes behind Australian Central Standard Time (ACST). ACST uses a UTC offset of UTC+10:30, while PST uses UTC-7. For example, when it's 9:00 AM in ACST, it's 3:30 PM in PST. Note that this difference may shift by one hour during daylight saving time transitions if the two zones change on different dates. Use the conversion table above to see the exact time for each hour of the day.

How do I convert ACST to PST?

To convert ACST to PST, subtract 17 hours and 30 minutes from the ACST time. For example, 9:00 AM ACST is 3:30 PM PST, and 5:00 PM ACST is 11:30 PM PST. Keep in mind that during daylight saving time transitions, the offset between these timezones may temporarily change by one hour. You can also use the interactive converter above for quick, accurate results.

What time is it in PST when it's noon in ACST?

When it's 12:00 PM (noon) in ACST, it's 6:30 PM in PST. This is because PST is 17 hours and 30 minutes behind ACST. Similarly, when it's 6:00 PM in ACST, it's 12:30 AM in PST. During daylight saving time transitions, these times may shift by one hour, so always verify the current offset. The color-coded conversion table above shows every hour mapped between both timezones.

How many hours behind is PST from ACST?

PST is 17 hours and 30 minutes behind ACST. This means when it's 9:00 AM in ACST, it's 3:30 PM in PST, and when it's midnight in ACST, it's 6:30 AM in PST. The exact difference can vary by one hour during daylight saving time transitions. The conversion table above provides a complete hour-by-hour mapping.

Is PST ahead or behind ACST?

PST is behind ACST by 17 hours and 30 minutes. Clocks in PST show an earlier time than ACST, meaning the day starts later in PST relative to ACST. For example, when it's noon in ACST, it's still 6:30 PM in PST. This gap may change by one hour during DST transitions.

Does ACST observe daylight saving time?

Yes, Australian Central Standard Time observes daylight saving time. During DST, the abbreviation changes to ACDT and clocks move forward by one hour, typically in spring. Clocks then fall back in autumn, returning to standard ACST time. This means the UTC offset for ACST shifts between two values depending on the season. Check our DST change calendar for exact transition dates that may affect your ACST to PST conversions.

Does PST observe daylight saving time?

Yes, Pacific Standard Time observes daylight saving time. During DST, the abbreviation changes to PDT and clocks move forward by one hour, typically in spring. Clocks then fall back in autumn, returning to standard PST time. This means the UTC offset for PST shifts between two values depending on the season. Check our DST change calendar for exact transition dates that may affect your ACST to PST conversions.

What is the best time to call from ACST to PST?

The best time for a call between ACST and PST is during overlapping business hours (9 AM – 5 PM) in both timezones. To reach someone in PST during their work day, call between 2:30 AM and 10:30 AM your ACST time. Avoid calling too early or late, as the 17 hours and 30 minutes difference means your evening could be their early morning. Check the color-coded conversion table above — green hours indicate business hours in both zones, making it easy to find the ideal time.

When does daylight saving time change in ACST?

Daylight saving time transitions vary by year and region. Australian Central Standard Time observes DST, which typically shifts clocks forward by one hour in spring ("spring forward") and back in fall ("fall back"). During these transition periods, the time difference between ACST and PST may temporarily change by one hour, which can cause confusion for scheduled meetings or calls. It's important to double-check your conversions around transition dates, especially if the two timezones switch on different dates. Check our DST change calendar for exact transition dates in the current year.

Do ACST and PST ever have the same time?

No, ACST and PST are always 17 hours and 30 minutes apart and never display the same clock time simultaneously. Both timezones observe DST and typically transition around the same period, so the standard difference remains consistent throughout the year. The 17 hours and 30 minutes offset is determined by their fixed positions relative to the Prime Meridian (UTC). You can always rely on this consistent difference when planning across these timezones.

ACST to PST Converter

Convert Australian Central Standard Time to Pacific Standard Time. See the hour-by-hour conversion table below.

Upcoming DST Change

Australian Central Time (ACDT) will fall back on April 5. Clocks will shift by 1 hour (ACDT → ACST).

View all DST changes

Timezone Details

Australian Central Standard Time

3:37 AM

Saturday, April 4, 2026

ACDT (UTC+10:30)

Pacific Standard Time

10:07 AM

Friday, April 3, 2026

PDT (UTC-07:00)

Difference: -17h 30m

ACDT DST: Yes (ACDT)

PDT DST: Yes (PDT)

24-Hour Overview

ACDT — 24-hour overview

12a12a

3a3a

6a6a

9a9a

10a

11a

12p12p

3p3p

6p6p

9p9p

10p

11p

NightMorningBusinessEvening

PDT — 24-hour overview

6a6a

9a9a

10a

11a

12p12p

3p3p

6p6p

9p9p

10p

11p

12a12a

3a3a

NightMorningBusinessEvening

Frequently Asked Questions

Related Conversions

PST to ACST EST to PST PST to EST PST to GMT GMT to PST PST to IST IST to PST PST to JST JST to PST

Cities in These Timezones

ACST Cities

Adelaide

PST Cities

Los Angeles San Diego San Francisco Seattle Las Vegas

More Tools

Compare ACST & PST Plan a Meeting (ACST & PST)See on Map

Learn More

How Time Zones Work Understanding DST Timezone Abbreviations

External Resources

Australian Central Standard Time on Wikipedia Pacific Standard Time on Wikipedia IANA Time Zone Database