What is the time difference between PST and ACST?

Australian Central Standard Time (ACST) is 17 hours and 30 minutes ahead of Pacific Standard Time (PST). PST uses a UTC offset of UTC-7, while ACST uses UTC+10:30. For example, when it's 9:00 AM in PST, it's 2:30 AM in ACST. 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 PST to ACST?

To convert PST to ACST, add 17 hours and 30 minutes to the PST time. For example, 9:00 AM PST is 2:30 AM ACST, and 5:00 PM PST is 10:30 AM ACST. 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 ACST when it's noon in PST?

When it's 12:00 PM (noon) in PST, it's 5:30 AM in ACST. This is because ACST is 17 hours and 30 minutes ahead of PST. Similarly, when it's 6:00 PM in PST, it's 11:30 AM in ACST. 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 ahead is ACST from PST?

ACST is 17 hours and 30 minutes ahead of PST. This means when it's 9:00 AM in PST, it's 2:30 AM in ACST, and when it's midnight in PST, it's 5:30 PM in ACST. 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 ACST ahead or behind PST?

ACST is ahead of PST by 17 hours and 30 minutes. Clocks in ACST show a later time than PST, meaning the day starts earlier in ACST relative to PST. For example, when it's morning in PST, it's already afternoon or evening in ACST. This gap may change by one hour during DST transitions.

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 PST to ACST conversions.

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 PST to ACST conversions.

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

The best time for a call between PST and ACST is during overlapping business hours (9 AM – 5 PM) in both timezones. To reach someone in ACST during their work day, call between 3:30 PM and 11:30 PM your PST time. Avoid calling too early or late, as the 17 hours and 30 minutes difference means your evening could be their late night. 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 PST?

Daylight saving time transitions vary by year and region. Pacific 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 PST and ACST 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 PST and ACST ever have the same time?

No, PST and ACST 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.

PST to ACST Converter

Convert Pacific Standard Time to Australian Central 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

Pacific Standard Time

8:03 PM

Friday, April 3, 2026

PDT (UTC-07:00)

Australian Central Standard Time

1:33 PM

Saturday, April 4, 2026

ACDT (UTC+10:30)

Difference: +17h 30m

PDT DST: Yes (PDT)

ACDT DST: Yes (ACDT)

24-Hour Overview

PDT — 24-hour overview

12a12a

3a3a

6a6a

9a9a

10a

11a

12p12p

3p3p

6p6p

9p9p

10p

11p

NightMorningBusinessEvening

ACDT — 24-hour overview

5p5p

8p8p

10p

11p11p

12a

2a2a

4a4a

7a7a

10a10a

11a

12p

1p1p

NightMorningBusinessEvening

Frequently Asked Questions

Related Conversions

ACST to PST 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

PST Cities

Los Angeles San Diego San Francisco Seattle Las Vegas

ACST Cities

Adelaide

More Tools

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

Learn More

How Time Zones Work Understanding DST Timezone Abbreviations

External Resources

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