List of Supported Timezones
PHP Manual

Australia

Australia
Australia/ACT Australia/Adelaide Australia/Brisbane Australia/Broken_Hill Australia/Canberra
Australia/Currie Australia/Darwin Australia/Eucla 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