PDT to AEDT Converter
Convert time between Pacific Daylight Time (PDT) and Australian Eastern Daylight Time (AEDT)
Pacific Daylight Time (PDT)
Australian Eastern Daylight Time (AEDT)
Time Difference
Australian Eastern Daylight Time (AEDT) is 0 hours ahead of Pacific Daylight Time (PDT)
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Select Time
Quick Reference
| PDT | AEDT |
|---|---|
| 19:00 | 12:00 |
| 21:00 | 14:00 |
| 23:00 | 16:00 |
| 01:00 | 18:00 |
| 03:00 | 20:00 |
| 05:00 | 22:00 |
| 07:00 | 00:00 |
| 09:00 | 02:00 |
| 11:00 | 04:00 |
| 13:00 | 06:00 |
| 15:00 | 08:00 |
| 17:00 | 10:00 |
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
About PDT to AEDT Time Conversion
Converting time between Pacific Daylight Time (PDT) and Australian Eastern Daylight Time (AEDT) spans an 18-hour difference. PDT is UTC-7 and is observed along the US and Canadian Pacific coast during summer, while AEDT is UTC+11 and covers eastern Australia during its own summer months, making AEDT 18 hours ahead of PDT.
This time zone converter uses the IANA timezone database to ensure accurate calculations, accounting for daylight saving time transitions in both regions. Whether you're scheduling business meetings, managing remote teams, or staying in touch with contacts between Los Angeles and Sydney, our converter provides reliable results for this large 18-hour gap.
Common Use Cases for PDT to AEDT Conversion
Business & Work
- Scheduling meetings between US West Coast teams and Sydney or Melbourne offices
- Coordinating project deadlines and deliverables across the 18-hour time gap
- Planning conference calls and webinars for US Pacific-Australia cross-Pacific partnerships
Personal & Travel
- Planning travel itineraries and flight connections between the US West Coast and eastern Australia
- Coordinating with family and friends living in Sydney, Melbourne, or Canberra
- Scheduling virtual events and online activities across the large time difference
Time Zone Information
Pacific Daylight Time (PDT)
- UTC Offset: UTC-7
- IANA Timezone: America/Los_Angeles
- Daylight Saving: Second Sunday in March to First Sunday in November
- Major Cities: Los Angeles, San Francisco, Seattle, Portland, Vancouver
- Coverage: Pacific United States and Canada during summer months
Australian Eastern Daylight Time (AEDT)
- UTC Offset: UTC+11
- IANA Timezone: Australia/Sydney
- Daylight Saving: First Sunday in October to First Sunday in April
- Major Cities: Sydney, Melbourne, Canberra, Hobart, Newcastle
- Coverage: Eastern Australia (New South Wales, Victoria, ACT, Tasmania) during summer
Quick Reference: PDT to AEDT
Remember: AEDT is always 18 hours ahead of PDT
Frequently Asked Questions
What is the time difference between PDT and AEDT?
Pacific Daylight Time (PDT) is UTC-7, while Australian Eastern Daylight Time (AEDT) is UTC+11. AEDT is 18 hours ahead of PDT. When it's 12:00 PM in Los Angeles, it's 6:00 AM the next day in Sydney.
When does the PDT to AEDT conversion apply?
This 18-hour conversion applies when the US Pacific coast is on PDT (second Sunday in March to first Sunday in November) and eastern Australia is on AEDT (first Sunday in October to first Sunday in April). The overlap window where both zones are active runs from early October to early November.
How does the time difference change throughout the year?
When the US Pacific coast reverts to PST (UTC-8) in November, the offset increases to 19 hours. When Australia ends AEDT in early April and shifts to AEST (UTC+10), the offset from PDT drops to 17 hours. The exact gap depends on which seasonal clocks are currently active in each region.
What are the best times for PDT to AEDT business calls?
Late afternoon on the US West Coast works best. 4:00–6:00 PM PDT aligns with 10:00 AM–12:00 PM AEDT in Sydney the next day, which is mid-morning in Australia. Early morning Sydney time (8:00–9:00 AM AEDT) corresponds to 2:00–3:00 PM PDT the previous day, also a workable window.
Which regions use AEDT?
AEDT (UTC+11) is observed during summer by New South Wales, Victoria, the Australian Capital Territory, and Tasmania. Major cities include Sydney, Melbourne, Canberra, and Hobart. Queensland does not observe AEDT and remains on AEST (UTC+10) year-round.
Which regions use PDT?
PDT (UTC-7) is used during summer by California, Oregon, Washington, Nevada, and British Columbia. Major cities include Los Angeles, San Francisco, Seattle, Portland, and Vancouver. These regions switch back to PST (UTC-8) in November.
Pro Tips
- • AEDT is 18 hours ahead of PDT — adding 18 hours always pushes you into the next calendar day.
- • Late afternoon PDT (4:00–6:00 PM) is the best window to reach Sydney during business hours.
- • Both PDT and AEDT are seasonal — the 18-hour offset only applies during the brief October–November overlap.
- • When the US switches to PST in November, the gap grows to 19 hours — update your scheduling accordingly.
- • Queensland (Brisbane) stays on AEST year-round — the PDT to Brisbane offset is 17 hours, not 18.
- • For regular PDT–AEDT collaboration, late afternoon West Coast time minimises disruption for both parties.