DST starts at 02:00 (2 am) on first Sunday of October, when the clocks move forward by 1 hour to 03:00 (3 am) local time. DST ends at 03:00 (3 am) when the clocks move back to 02:00 (2 am) local time on the first Sunday of April.
During DST, time zones have a different UTC-offset and time zone name. In Australia these are:
The Australian dependencies Cocos Islands, Norfolk Island, and Christmas Island all have their own time zones, and do not observe DST.
Macquarie Island has no permanent population and its time zone can vary. Australian Antarctic stations Casey and Davis adjust their time zones to the needs of the personnel on the stations.