AEDT vs UTC — cities and working rhythm
Australia's east coast — Sydney (financial), Melbourne (corporate HQ / media), Brisbane (mining / education). Business hours 9 AM – 5 PM AET. Summer: AEDT (UTC+11); winter: AEST (UTC+10). Brisbane stays on AEST year-round — so Sydney and Brisbane are 1 h apart in summer, same in winter. Almost entirely opposite of European hours.
UTC is the reference offset — not a civil timezone anywhere, but the standard for aviation ("Zulu time"), server logs, astronomy, and cross-timezone team calendars. When distributed engineering teams schedule "the daily standup at 15:00 UTC" they're dodging the DST-flip mess entirely.
Time gap: UTC is 11.0 hours behind AEDT (standard-time offsets — daylight-saving flips shift this by an hour twice a year in most northern-hemisphere zones).