There are three major time zones in Australia
Eastern Standard Time
GMT + 10
NSW, ACT, Victoria, Queensland and Tasmania
GMT + 9.5
Northern Territory and South Australia
GMT + 8
Daylight savings (Summer Time) is observed by most Australian states. NSW, ACT, Victoria, Tasmania and South Australia wind their clocks forward one hour from early October, until early April. Queensland, Western Australia and the Northern Territory do not observe daylight saving.
For the current time in various Australian centres visit www.thetimenow.com/worldclock.php
US visitors should also be aware that Australians write the date in day/month/year format.