I suppose it is no issue to the US, or to Russia and it Australia is shouldn't be so complicated either.
ABC News Radio, a national programme, broadcasts to all of Australia simultaneously. Radio National also broadcasts to all of Australia, but I think it does some time shifting of programmes, so you don't get so many time calls.
Sorting the logistics of different time zones for our national broadcaster must be a nightmare. It is a bit of a nightmare for us listeners.
While Australia has three time zones, western, central and eastern, come daylight saving, this increases to five.
Easier for me to use the capital city names rather than state names. Eastern time zone, Melbourne, Sydney and Hobart all move forward one hour, but Brisbane does not.
Adelaide on central time moves forward an hour, but in the same zone, Darwin does not.
And nothing moves Perth in the western zone. They even took a vote on it.
So on the radio, we hear something like this.
It is 11.16 in Tasmania, Victoria and New South Wales, 10.16 in Queensland, 10.46 in South Australia, 9.46 in Nothern Territory and 8.16 in West Australia. I have heard it on the radio before, but not of late perhaps because it is the same, and 10.46 in Broken Hill. Although Broken Hill is in outback NSW, it takes it time from South Australia.
I hope that clears up any confusion you may have. It is clear as mud to me.