What time will ios7 be available for update in Australia?

I have iPhone 5. Waiting for the ios7 update but it's already the 18th? Well 12:15am at the time of this post.

Sep 18. For sure

but since youre in australia then it would be on the 19 midnight

They are usually available from around 9AM at Apple in California so for you it will be between 1 and 2 AM Thursday (19th) morning.

http://www.timeanddate.com/worldclock/fixedtime.html?p1=1239&iso=20130918T09&msg=iOS%207%20launch&sort=1