Date-Time

Get Current Timezone information

timedatectl

Get Available Timezones

timedatectl list-timezones
# OR Use grep to filter the long list of Timezones
timedatectl list-timezones | grep Australia

#Outputs:
#Australia/ACT
#Australia/Adelaide
#Australia/Brisbane
#Australia/Broken_Hill
#Australia/Canberra
#Australia/Currie
#... (more omitted)

Set Timezone (sudo required)

sudo timedatectl set-timezone 'Australia/Sydney'