List of Supported Timezones
PHP Manual

List of timezones in the group Australia

Australia
Australia/ACT Australia/Adelaide Australia/Brisbane Australia/Broken_Hill Australia/Canberra
Australia/Currie Australia/Darwin Australia/Hobart Australia/LHI Australia/Lindeman
Australia/Lord_Howe Australia/Melbourne Australia/North Australia/NSW Australia/Perth
Australia/Queensland Australia/South Australia/Sydney Australia/Tasmania Australia/Victoria
Australia/West Australia/Yancowinna

List of Supported Timezones
PHP Manual