Queensland, and therefore Brisbane, does not observe Daylight Savings Time.
Daylight Saving Time (DST) is the practice of advancing clocks one hour during the warmer months of the year. In Australia, Daylight saving is observed in New South Wales, Victoria, South Australia, Tasmania, and the Australian Capital Territory.
Daylight saving is not observed in Queensland, the Northern Territory or Western Australia.
Daylight Saving Time begins at 2am on the first Sunday in October, when clocks are put forward one hour. It ends at 2am (which is 3am Daylight Saving Time) on the first Sunday in April, when clocks are put back one hour.
Source: http://www.australia.gov.au/about-australia/our-country/time
Some people like to remember the following sayings, to remind themselves which way to change the clock:
Spring forward = spring = jump
Fall back = fall = autumn
