PST to AEST Converter
Convert time between Pacific Standard Time (PST) and Australian Eastern Standard Time (AEST)
Pacific Standard Time (PST)
Australian Eastern Standard Time (AEST)
Time Difference
Australian Eastern Standard Time (AEST) is 0 hours ahead of Pacific Standard Time (PST)
Select Date
Select Time
Quick Reference
| PST | AEST |
|---|---|
| 18:00 | 13:00 |
| 20:00 | 15:00 |
| 22:00 | 17:00 |
| 00:00 | 19:00 |
| 02:00 | 21:00 |
| 04:00 | 23:00 |
| 06:00 | 01:00 |
| 08:00 | 03:00 |
| 10:00 | 05:00 |
| 12:00 | 07:00 |
| 14:00 | 09:00 |
| 16:00 | 11:00 |
Top 10 Most Common Time Zones
| Abbreviation | Full Name | UTC Offset | Typical Use |
|---|---|---|---|
| UTC | Coordinated Universal Time | UTC ±0 | Global reference standard (servers, logs, APIs) |
| EST / EDT | Eastern (US) Time | UTC −5 / −4 | New York, Toronto — North American business hub |
| CST / CDT | Central (US) Time | UTC −6 / −5 | Chicago, Dallas — US central business region |
| PST / PDT | Pacific (US) Time | UTC −8 / −7 | San Francisco, Los Angeles — tech industry standard |
| GMT / BST | Greenwich Mean / British Summer Time | UTC 0 / +1 | UK, used globally as a reference with UTC |
| CET / CEST | Central European (Summer) Time | UTC +1 / +2 | Paris, Berlin, Amsterdam — EU business core |
| IST | India Standard Time | UTC +5:30 | India — major IT & outsourcing region |
| CST | China Standard Time | UTC +8 | Beijing, Shanghai — East Asia business hub |
| JST | Japan Standard Time | UTC +9 | Tokyo — finance & tech hub |
| AEST / AEDT | Australian Eastern (Daylight) Time | UTC +10 / +11 | Sydney, Melbourne — APAC regional business |
Why Time Zone Abbreviations Are Ambiguous
Unlike standardized identifiers (like America/New_York or Europe/London from the IANA tz database), abbreviations such as "CST" or "IST" are not globally unique. They can refer to different time zones depending on context — country, region, or even time of year (due to daylight saving time).
Common Ambiguous Time Zone Abbreviations
| Abbrev. | Common Meaning(s) | UTC Offset | Region(s) |
|---|---|---|---|
| CST | Central Standard Time / China Standard Time / Cuba Standard Time | UTC−6 / UTC+8 / UTC−5 | North America, China, Cuba |
| IST | Indian Standard Time / Irish Standard Time / Israel Standard Time | UTC+5:30 / UTC+1 / UTC+2 | India, Ireland, Israel |
| AST | Atlantic Standard Time / Arabia Standard Time | UTC−4 / UTC+3 | Caribbean, Canada, Middle East |
| PST | Pacific Standard Time / Philippine Standard Time | UTC−8 / UTC+8 | North America, Philippines |
| EST | Eastern Standard Time (North America / Australia) | UTC−5 / UTC+10 | North America, Australia |
✅ Best Practice
To avoid ambiguity, always:
- Use IANA tz identifiers — e.g.,
America/New_Yorkinstead of "EST" - Specify UTC offset explicitly — e.g.,
UTC−5when abbreviations must be used - Include the full timezone name — e.g., "Eastern Standard Time (EST)" with UTC offset
Related Time Zone Conversions
About PST to AEST Time Conversion
Converting time between Pacific Standard Time (PST) and Australian Eastern Standard Time (AEST) is essential for US West Coast to Australia coordination. PST is UTC-8 while AEST is UTC+10, making AEST 18 hours ahead of PST. The US West Coast observes daylight saving time, so the actual difference varies between 18 hours (when PST is active) and 17 hours (when PDT is active). Australia does not observe daylight saving time during winter (AEST period), so AEST remains constant during this season.
This conversion is crucial for business operations between the US West Coast and Australia. Whether you're scheduling international meetings between Silicon Valley and Sydney, coordinating with Australian business partners, managing customer service operations, or planning travel, our accurate IANA-based converter ensures precise timezone calculations accounting for seasonal daylight saving changes.
Common Use Cases for PST to AEST Conversion
Business & Work
- Scheduling US West Coast to Australia business meetings
- Coordinating Silicon Valley and Sydney tech operations
- Managing global business operations between US West Coast and Australia
Personal & Travel
- Planning travel from US West Coast to Australia
- Coordinating with Australian family and friends from the US
- Scheduling virtual events for US-Australia audiences
Time Zone Information
Pacific Standard Time (PST)
- UTC Offset: UTC-8
- IANA Timezone: America/Los_Angeles
- Daylight Saving: First Sunday in November to Second Sunday in March
- Major Cities: Los Angeles, San Francisco, Seattle, Portland, San Diego
- Coverage: Pacific Coast of United States and Canada
Australian Eastern Standard Time (AEST)
- UTC Offset: UTC+10
- IANA Timezone: Australia/Sydney
- Daylight Saving: None - AEST is standard time (winter months)
- Major Cities: Sydney, Melbourne, Brisbane, Canberra, Newcastle
- Coverage: Eastern Australia
Quick Reference: PST to AEST
Remember: AEST is always 18 hours ahead of PST, but becomes 17 hours when PDT is active (daylight saving time)
Frequently Asked Questions
What is the time difference between PST and AEST?
Pacific Standard Time (PST) is UTC-8, while Australian Eastern Standard Time (AEST) is UTC+10. AEST is 18 hours ahead of PST. This means when it's 8:00 AM in PST, it's 2:00 AM the next day in AEST.
Does the United States observe daylight saving time on the West Coast?
Yes, the US West Coast observes daylight saving time. Pacific Standard Time (PST) transitions to Pacific Daylight Time (PDT, UTC-7) from mid-March to early November. Australia does not observe daylight saving time during winter (AEST period). This means the time difference varies between 18 hours (when PST is active) and 17 hours (when PDT is active).
What is the time difference during Pacific Daylight Time (PDT)?
When the US West Coast observes Pacific Daylight Time (PDT, UTC-7) from mid-March to early November, the difference becomes 17 hours. During this period, when it's 8:00 AM PDT, it would be 1:00 AM AEST the next day. This is why it's important to verify whether PST or PDT is currently active.
What major cities are in PST and AEST timezones?
PST covers major US West Coast cities like Los Angeles, San Francisco, Seattle, Portland, and San Diego. AEST covers major Australian cities including Sydney, Melbourne, Brisbane, Canberra, and Newcastle in eastern Australia.
How do I convert PST to AEST manually?
To convert from PST to AEST, add 18 hours to the PST time. For example, if it's 3:00 PM PST, add 18 hours to get 9:00 AM AEST the next day. Remember that the difference becomes 17 hours when the US West Coast observes PDT (daylight saving time).
What should I know about scheduling across PST and AEST?
Australia is 17-18 hours ahead of the US West Coast, with very limited overlap. Morning PST times (8-10 AM) correspond to early morning AEST times (2-4 AM next day), while afternoon PST (2-4 PM) corresponds to morning AEST (8-10 AM next day). Evening PST (6-8 PM) aligns with late morning/afternoon AEST (12-2 PM next day), offering good opportunities for real-time collaboration.
Pro Tips
- • AEST is always 18 hours ahead of PST - but becomes 17 hours when PDT is active (March-November).
- • The US West Coast observes daylight saving time, shifting from PST (UTC-8) to PDT (UTC-7), while Australia remains on AEST year-round during winter.
- • Evening PST (6-8 PM) equals late morning/afternoon AEST (12-2 PM next day), providing the best time overlap for business meetings.
- • Morning PST (8-10 AM) equals very early morning AEST (2-4 AM next day), making synchronous meetings challenging unless Australian partners start very early.
- • Use 24-hour time format when communicating across PST-AEST to eliminate AM/PM confusion and handle day transitions clearly.
- • Between March and November, remember the 17-hour difference when PST transitions to PDT due to US daylight saving time.