Daylight Saving Time is observed in New South Wales, Victoria, South Australia, Tasmania, and the Australian Capital Territory and has been synchronised across these states. In a referendum held in Western Australia in May 2011, voters chose to reject daylight saving. Queensland and the Northern Territory do not observe daylight saving.
Across the south-eastern states and the ACT, daylight saving for future summers begins at 2am Eastern Standard Time on the first Sunday in October and ends at 2am Eastern Standard Time (3am summer time) on the first Sunday in April.
AEST becomes Australian Eastern Daylight Time (AEDT), and clocks are advanced to UTC +11.
ACST becomes Australian Central Daylight Time (ACDT), and clocks are advanced to UTC +10 ½.
There are three times zones in Australia -
Australian Eastern Standard Time (AEST) is equal to Coordinated Universal Time plus 10 hours (UTC +10).
AEST is followed in these regions:
New South Wales (except Broken Hill) Victoria Queensland Tasmania Australian Capital Territory Central
Australian Central Standard Time (ACST) is equal to Coordinated Universal Time plus 9 ½ hours (UTC +9 ½).
ACST is followed in these regions:
South Australia Northern Territory Broken Hill, NSW Western
Australian Western Standard Time (AWST) is equal to Coordinated Universal Time plus 8 hours (UTC +8).
AWST is followed in these regions:
Sunday 6th October 2013, at 2:00 am when clocks are put forward one hour.
Sunday 7th April 2013, at 3:00 am summer time when clocks are put back one hour.