That date listed is the final day in which you’ll be able to enter Australia. Once you have entered Australia, you might keep for 3 months, even when it stretches past this expiration date. You must enter the nation of Australia by the date listed on your visa, otherwise, a new visa is required. Yes, you could stay past the expiration date listed on your ETA visa, nonetheless you may not keep longer than three months in Australia at anybody time. If you passport is about to expire , you must verify with an Australian embassy to see if you are still allowed to visit the nation.