Sydney

Australia • Australian Eastern Time

Time Zone

Sydney uses Australian Eastern Time (AEST / AEDT), currently running at UTC+10 (Apr–Oct) / UTC+11 (Oct–Apr). Sydney observes daylight saving — clocks spring forward in early October and fall back in early April. Because Australia is in the Southern Hemisphere, Sydney's summer (and UTC+11 period) falls during Northern Hemisphere winter.

Business & Commerce

Sydney operates on Australian Eastern Standard Time (AEST, UTC+10) from April through October and Australian Eastern Daylight Time (AEDT, UTC+11) from October through April — reversed from the Northern Hemisphere because Australia's seasons are inverted. This creates a counterintuitive pattern: Sydney is at UTC+11 during months when New York and London are at their lowest offsets (Northern Hemisphere winter), and UTC+10 when Northern Hemisphere clocks advance. The Australian Securities Exchange (ASX) opens at 10:00 AM Sydney time and closes at 4:00 PM. Sydney is typically fifteen to seventeen hours ahead of New York and ten to eleven hours ahead of London, meaning Sydney's business day begins long before any European or American market opens. This places Sydney as the first major financial center to begin each new trading week on Monday morning.