Australien Winterzeit [top] Instant
So it is: (Though more natural in German: die Winterzeit in Australien )
If you meant the country alone: das Australien (neuter, because country names with -ien are neuter: das Australien – though usually used without an article). australien winterzeit
The correct German article for is "die" (feminine). So it is: (Though more natural in German: