About Sydney Time (Australian Eastern Time)
Sydney operates on Australian Eastern Standard Time (AEST) at UTC+10, switching to Australian Eastern Daylight Time (AEDT) at UTC+11 during the warmer months. As Australia's largest city and financial capital, Sydney's time zone is critical for Asia-Pacific business operations.
Australia's daylight saving time runs opposite to the Northern Hemisphere. Clocks spring forward on the first Sunday of October at 2:00 AM and fall back on the first Sunday of April at 3:00 AM. Not all Australian states observe DST — Queensland, Western Australia, and the Northern Territory do not, which can cause confusion even within the country.
The Australian Securities Exchange (ASX) in Sydney opens at 10:00 AM and closes at 4:00 PM AEST/AEDT. Sydney's time zone places it well for Asian market overlap — the ASX trading day coincides with afternoon hours in Tokyo, Hong Kong, and Singapore.
For businesses connecting Sydney with Europe, the time gap is significant: Sydney is 9-11 hours ahead of London depending on DST. The small overlap window means early morning calls from Sydney (7-8 AM) catch the end of the London business day. With the US East Coast, Sydney is 14-16 hours ahead, making real-time collaboration challenging.
When scheduling with Sydney, note that the Australian weekend starts at the same time as Friday morning in the Americas. A Friday 5 PM deadline in Sydney means Thursday evening in New York — plan accordingly for cross-Pacific projects.